1 /* 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #ifndef _WINDOWS 27 #include "alloca.h" 28 #endif 29 #include "asm/macroAssembler.hpp" 30 #include "asm/macroAssembler.inline.hpp" 31 #include "code/debugInfoRec.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "oops/compiledICHolder.hpp" 36 #include "prims/jvmtiRedefineClassesTrace.hpp" 37 #include "runtime/sharedRuntime.hpp" 38 #include "runtime/vframeArray.hpp" 39 #include "vmreg_x86.inline.hpp" 40 #ifdef COMPILER1 41 #include "c1/c1_Runtime1.hpp" 42 #endif 43 #ifdef COMPILER2 44 #include "opto/runtime.hpp" 45 #endif 46 47 #define __ masm-> 48 49 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size; 50 51 class SimpleRuntimeFrame { 52 53 public: 54 55 // Most of the runtime stubs have this simple frame layout. 56 // This class exists to make the layout shared in one place. 57 // Offsets are for compiler stack slots, which are jints. 58 enum layout { 59 // The frame sender code expects that rbp will be in the "natural" place and 60 // will override any oopMap setting for it. We must therefore force the layout 61 // so that it agrees with the frame sender code. 62 rbp_off = frame::arg_reg_save_area_bytes/BytesPerInt, 63 rbp_off2, 64 return_off, return_off2, 65 framesize 66 }; 67 }; 68 69 class RegisterSaver { 70 // Capture info about frame layout. Layout offsets are in jint 71 // units because compiler frame slots are jints. 72 #define DEF_XMM_OFFS(regnum) xmm ## regnum ## _off = xmm_off + (regnum)*16/BytesPerInt, xmm ## regnum ## H_off 73 enum layout { 74 fpu_state_off = frame::arg_reg_save_area_bytes/BytesPerInt, // fxsave save area 75 xmm_off = fpu_state_off + 160/BytesPerInt, // offset in fxsave save area 76 DEF_XMM_OFFS(0), 77 DEF_XMM_OFFS(1), 78 DEF_XMM_OFFS(2), 79 DEF_XMM_OFFS(3), 80 DEF_XMM_OFFS(4), 81 DEF_XMM_OFFS(5), 82 DEF_XMM_OFFS(6), 83 DEF_XMM_OFFS(7), 84 DEF_XMM_OFFS(8), 85 DEF_XMM_OFFS(9), 86 DEF_XMM_OFFS(10), 87 DEF_XMM_OFFS(11), 88 DEF_XMM_OFFS(12), 89 DEF_XMM_OFFS(13), 90 DEF_XMM_OFFS(14), 91 DEF_XMM_OFFS(15), 92 fpu_state_end = fpu_state_off + ((FPUStateSizeInWords-1)*wordSize / BytesPerInt), 93 fpu_stateH_end, 94 r15_off, r15H_off, 95 r14_off, r14H_off, 96 r13_off, r13H_off, 97 r12_off, r12H_off, 98 r11_off, r11H_off, 99 r10_off, r10H_off, 100 r9_off, r9H_off, 101 r8_off, r8H_off, 102 rdi_off, rdiH_off, 103 rsi_off, rsiH_off, 104 ignore_off, ignoreH_off, // extra copy of rbp 105 rsp_off, rspH_off, 106 rbx_off, rbxH_off, 107 rdx_off, rdxH_off, 108 rcx_off, rcxH_off, 109 rax_off, raxH_off, 110 // 16-byte stack alignment fill word: see MacroAssembler::push/pop_IU_state 111 align_off, alignH_off, 112 flags_off, flagsH_off, 113 // The frame sender code expects that rbp will be in the "natural" place and 114 // will override any oopMap setting for it. We must therefore force the layout 115 // so that it agrees with the frame sender code. 116 rbp_off, rbpH_off, // copy of rbp we will restore 117 return_off, returnH_off, // slot for return address 118 reg_save_size // size in compiler stack slots 119 }; 120 121 public: 122 static OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors = false); 123 static void restore_live_registers(MacroAssembler* masm, bool restore_vectors = false); 124 125 // Offsets into the register save area 126 // Used by deoptimization when it is managing result register 127 // values on its own 128 129 static int rax_offset_in_bytes(void) { return BytesPerInt * rax_off; } 130 static int rdx_offset_in_bytes(void) { return BytesPerInt * rdx_off; } 131 static int rbx_offset_in_bytes(void) { return BytesPerInt * rbx_off; } 132 static int xmm0_offset_in_bytes(void) { return BytesPerInt * xmm0_off; } 133 static int return_offset_in_bytes(void) { return BytesPerInt * return_off; } 134 135 // During deoptimization only the result registers need to be restored, 136 // all the other values have already been extracted. 137 static void restore_result_registers(MacroAssembler* masm); 138 }; 139 140 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors) { 141 int vect_words = 0; 142 #ifdef COMPILER2 143 if (save_vectors) { 144 assert(UseAVX > 0, "256bit vectors are supported only with AVX"); 145 assert(MaxVectorSize == 32, "only 256bit vectors are supported now"); 146 // Save upper half of YMM registes 147 vect_words = 16 * 16 / wordSize; 148 additional_frame_words += vect_words; 149 } 150 #else 151 assert(!save_vectors, "vectors are generated only by C2"); 152 #endif 153 154 // Always make the frame size 16-byte aligned 155 int frame_size_in_bytes = round_to(additional_frame_words*wordSize + 156 reg_save_size*BytesPerInt, 16); 157 // OopMap frame size is in compiler stack slots (jint's) not bytes or words 158 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt; 159 // The caller will allocate additional_frame_words 160 int additional_frame_slots = additional_frame_words*wordSize / BytesPerInt; 161 // CodeBlob frame size is in words. 162 int frame_size_in_words = frame_size_in_bytes / wordSize; 163 *total_frame_words = frame_size_in_words; 164 165 // Save registers, fpu state, and flags. 166 // We assume caller has already pushed the return address onto the 167 // stack, so rsp is 8-byte aligned here. 168 // We push rpb twice in this sequence because we want the real rbp 169 // to be under the return like a normal enter. 170 171 __ enter(); // rsp becomes 16-byte aligned here 172 __ push_CPU_state(); // Push a multiple of 16 bytes 173 174 if (vect_words > 0) { 175 assert(vect_words*wordSize == 256, ""); 176 __ subptr(rsp, 256); // Save upper half of YMM registes 177 __ vextractf128h(Address(rsp, 0),xmm0); 178 __ vextractf128h(Address(rsp, 16),xmm1); 179 __ vextractf128h(Address(rsp, 32),xmm2); 180 __ vextractf128h(Address(rsp, 48),xmm3); 181 __ vextractf128h(Address(rsp, 64),xmm4); 182 __ vextractf128h(Address(rsp, 80),xmm5); 183 __ vextractf128h(Address(rsp, 96),xmm6); 184 __ vextractf128h(Address(rsp,112),xmm7); 185 __ vextractf128h(Address(rsp,128),xmm8); 186 __ vextractf128h(Address(rsp,144),xmm9); 187 __ vextractf128h(Address(rsp,160),xmm10); 188 __ vextractf128h(Address(rsp,176),xmm11); 189 __ vextractf128h(Address(rsp,192),xmm12); 190 __ vextractf128h(Address(rsp,208),xmm13); 191 __ vextractf128h(Address(rsp,224),xmm14); 192 __ vextractf128h(Address(rsp,240),xmm15); 193 } 194 if (frame::arg_reg_save_area_bytes != 0) { 195 // Allocate argument register save area 196 __ subptr(rsp, frame::arg_reg_save_area_bytes); 197 } 198 199 // Set an oopmap for the call site. This oopmap will map all 200 // oop-registers and debug-info registers as callee-saved. This 201 // will allow deoptimization at this safepoint to find all possible 202 // debug-info recordings, as well as let GC find all oops. 203 204 OopMapSet *oop_maps = new OopMapSet(); 205 OopMap* map = new OopMap(frame_size_in_slots, 0); 206 207 #define STACK_OFFSET(x) VMRegImpl::stack2reg((x) + additional_frame_slots) 208 209 map->set_callee_saved(STACK_OFFSET( rax_off ), rax->as_VMReg()); 210 map->set_callee_saved(STACK_OFFSET( rcx_off ), rcx->as_VMReg()); 211 map->set_callee_saved(STACK_OFFSET( rdx_off ), rdx->as_VMReg()); 212 map->set_callee_saved(STACK_OFFSET( rbx_off ), rbx->as_VMReg()); 213 // rbp location is known implicitly by the frame sender code, needs no oopmap 214 // and the location where rbp was saved by is ignored 215 map->set_callee_saved(STACK_OFFSET( rsi_off ), rsi->as_VMReg()); 216 map->set_callee_saved(STACK_OFFSET( rdi_off ), rdi->as_VMReg()); 217 map->set_callee_saved(STACK_OFFSET( r8_off ), r8->as_VMReg()); 218 map->set_callee_saved(STACK_OFFSET( r9_off ), r9->as_VMReg()); 219 map->set_callee_saved(STACK_OFFSET( r10_off ), r10->as_VMReg()); 220 map->set_callee_saved(STACK_OFFSET( r11_off ), r11->as_VMReg()); 221 map->set_callee_saved(STACK_OFFSET( r12_off ), r12->as_VMReg()); 222 map->set_callee_saved(STACK_OFFSET( r13_off ), r13->as_VMReg()); 223 map->set_callee_saved(STACK_OFFSET( r14_off ), r14->as_VMReg()); 224 map->set_callee_saved(STACK_OFFSET( r15_off ), r15->as_VMReg()); 225 map->set_callee_saved(STACK_OFFSET(xmm0_off ), xmm0->as_VMReg()); 226 map->set_callee_saved(STACK_OFFSET(xmm1_off ), xmm1->as_VMReg()); 227 map->set_callee_saved(STACK_OFFSET(xmm2_off ), xmm2->as_VMReg()); 228 map->set_callee_saved(STACK_OFFSET(xmm3_off ), xmm3->as_VMReg()); 229 map->set_callee_saved(STACK_OFFSET(xmm4_off ), xmm4->as_VMReg()); 230 map->set_callee_saved(STACK_OFFSET(xmm5_off ), xmm5->as_VMReg()); 231 map->set_callee_saved(STACK_OFFSET(xmm6_off ), xmm6->as_VMReg()); 232 map->set_callee_saved(STACK_OFFSET(xmm7_off ), xmm7->as_VMReg()); 233 map->set_callee_saved(STACK_OFFSET(xmm8_off ), xmm8->as_VMReg()); 234 map->set_callee_saved(STACK_OFFSET(xmm9_off ), xmm9->as_VMReg()); 235 map->set_callee_saved(STACK_OFFSET(xmm10_off), xmm10->as_VMReg()); 236 map->set_callee_saved(STACK_OFFSET(xmm11_off), xmm11->as_VMReg()); 237 map->set_callee_saved(STACK_OFFSET(xmm12_off), xmm12->as_VMReg()); 238 map->set_callee_saved(STACK_OFFSET(xmm13_off), xmm13->as_VMReg()); 239 map->set_callee_saved(STACK_OFFSET(xmm14_off), xmm14->as_VMReg()); 240 map->set_callee_saved(STACK_OFFSET(xmm15_off), xmm15->as_VMReg()); 241 242 // %%% These should all be a waste but we'll keep things as they were for now 243 if (true) { 244 map->set_callee_saved(STACK_OFFSET( raxH_off ), rax->as_VMReg()->next()); 245 map->set_callee_saved(STACK_OFFSET( rcxH_off ), rcx->as_VMReg()->next()); 246 map->set_callee_saved(STACK_OFFSET( rdxH_off ), rdx->as_VMReg()->next()); 247 map->set_callee_saved(STACK_OFFSET( rbxH_off ), rbx->as_VMReg()->next()); 248 // rbp location is known implicitly by the frame sender code, needs no oopmap 249 map->set_callee_saved(STACK_OFFSET( rsiH_off ), rsi->as_VMReg()->next()); 250 map->set_callee_saved(STACK_OFFSET( rdiH_off ), rdi->as_VMReg()->next()); 251 map->set_callee_saved(STACK_OFFSET( r8H_off ), r8->as_VMReg()->next()); 252 map->set_callee_saved(STACK_OFFSET( r9H_off ), r9->as_VMReg()->next()); 253 map->set_callee_saved(STACK_OFFSET( r10H_off ), r10->as_VMReg()->next()); 254 map->set_callee_saved(STACK_OFFSET( r11H_off ), r11->as_VMReg()->next()); 255 map->set_callee_saved(STACK_OFFSET( r12H_off ), r12->as_VMReg()->next()); 256 map->set_callee_saved(STACK_OFFSET( r13H_off ), r13->as_VMReg()->next()); 257 map->set_callee_saved(STACK_OFFSET( r14H_off ), r14->as_VMReg()->next()); 258 map->set_callee_saved(STACK_OFFSET( r15H_off ), r15->as_VMReg()->next()); 259 map->set_callee_saved(STACK_OFFSET(xmm0H_off ), xmm0->as_VMReg()->next()); 260 map->set_callee_saved(STACK_OFFSET(xmm1H_off ), xmm1->as_VMReg()->next()); 261 map->set_callee_saved(STACK_OFFSET(xmm2H_off ), xmm2->as_VMReg()->next()); 262 map->set_callee_saved(STACK_OFFSET(xmm3H_off ), xmm3->as_VMReg()->next()); 263 map->set_callee_saved(STACK_OFFSET(xmm4H_off ), xmm4->as_VMReg()->next()); 264 map->set_callee_saved(STACK_OFFSET(xmm5H_off ), xmm5->as_VMReg()->next()); 265 map->set_callee_saved(STACK_OFFSET(xmm6H_off ), xmm6->as_VMReg()->next()); 266 map->set_callee_saved(STACK_OFFSET(xmm7H_off ), xmm7->as_VMReg()->next()); 267 map->set_callee_saved(STACK_OFFSET(xmm8H_off ), xmm8->as_VMReg()->next()); 268 map->set_callee_saved(STACK_OFFSET(xmm9H_off ), xmm9->as_VMReg()->next()); 269 map->set_callee_saved(STACK_OFFSET(xmm10H_off), xmm10->as_VMReg()->next()); 270 map->set_callee_saved(STACK_OFFSET(xmm11H_off), xmm11->as_VMReg()->next()); 271 map->set_callee_saved(STACK_OFFSET(xmm12H_off), xmm12->as_VMReg()->next()); 272 map->set_callee_saved(STACK_OFFSET(xmm13H_off), xmm13->as_VMReg()->next()); 273 map->set_callee_saved(STACK_OFFSET(xmm14H_off), xmm14->as_VMReg()->next()); 274 map->set_callee_saved(STACK_OFFSET(xmm15H_off), xmm15->as_VMReg()->next()); 275 } 276 277 return map; 278 } 279 280 void RegisterSaver::restore_live_registers(MacroAssembler* masm, bool restore_vectors) { 281 if (frame::arg_reg_save_area_bytes != 0) { 282 // Pop arg register save area 283 __ addptr(rsp, frame::arg_reg_save_area_bytes); 284 } 285 #ifdef COMPILER2 286 if (restore_vectors) { 287 // Restore upper half of YMM registes. 288 assert(UseAVX > 0, "256bit vectors are supported only with AVX"); 289 assert(MaxVectorSize == 32, "only 256bit vectors are supported now"); 290 __ vinsertf128h(xmm0, Address(rsp, 0)); 291 __ vinsertf128h(xmm1, Address(rsp, 16)); 292 __ vinsertf128h(xmm2, Address(rsp, 32)); 293 __ vinsertf128h(xmm3, Address(rsp, 48)); 294 __ vinsertf128h(xmm4, Address(rsp, 64)); 295 __ vinsertf128h(xmm5, Address(rsp, 80)); 296 __ vinsertf128h(xmm6, Address(rsp, 96)); 297 __ vinsertf128h(xmm7, Address(rsp,112)); 298 __ vinsertf128h(xmm8, Address(rsp,128)); 299 __ vinsertf128h(xmm9, Address(rsp,144)); 300 __ vinsertf128h(xmm10, Address(rsp,160)); 301 __ vinsertf128h(xmm11, Address(rsp,176)); 302 __ vinsertf128h(xmm12, Address(rsp,192)); 303 __ vinsertf128h(xmm13, Address(rsp,208)); 304 __ vinsertf128h(xmm14, Address(rsp,224)); 305 __ vinsertf128h(xmm15, Address(rsp,240)); 306 __ addptr(rsp, 256); 307 } 308 #else 309 assert(!restore_vectors, "vectors are generated only by C2"); 310 #endif 311 // Recover CPU state 312 __ pop_CPU_state(); 313 // Get the rbp described implicitly by the calling convention (no oopMap) 314 __ pop(rbp); 315 } 316 317 void RegisterSaver::restore_result_registers(MacroAssembler* masm) { 318 319 // Just restore result register. Only used by deoptimization. By 320 // now any callee save register that needs to be restored to a c2 321 // caller of the deoptee has been extracted into the vframeArray 322 // and will be stuffed into the c2i adapter we create for later 323 // restoration so only result registers need to be restored here. 324 325 // Restore fp result register 326 __ movdbl(xmm0, Address(rsp, xmm0_offset_in_bytes())); 327 // Restore integer result register 328 __ movptr(rax, Address(rsp, rax_offset_in_bytes())); 329 __ movptr(rdx, Address(rsp, rdx_offset_in_bytes())); 330 331 // Pop all of the register save are off the stack except the return address 332 __ addptr(rsp, return_offset_in_bytes()); 333 } 334 335 // Is vector's size (in bytes) bigger than a size saved by default? 336 // 16 bytes XMM registers are saved by default using fxsave/fxrstor instructions. 337 bool SharedRuntime::is_wide_vector(int size) { 338 return size > 16; 339 } 340 341 // The java_calling_convention describes stack locations as ideal slots on 342 // a frame with no abi restrictions. Since we must observe abi restrictions 343 // (like the placement of the register window) the slots must be biased by 344 // the following value. 345 static int reg2offset_in(VMReg r) { 346 // Account for saved rbp and return address 347 // This should really be in_preserve_stack_slots 348 return (r->reg2stack() + 4) * VMRegImpl::stack_slot_size; 349 } 350 351 static int reg2offset_out(VMReg r) { 352 return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size; 353 } 354 355 // --------------------------------------------------------------------------- 356 // Read the array of BasicTypes from a signature, and compute where the 357 // arguments should go. Values in the VMRegPair regs array refer to 4-byte 358 // quantities. Values less than VMRegImpl::stack0 are registers, those above 359 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer 360 // as framesizes are fixed. 361 // VMRegImpl::stack0 refers to the first slot 0(sp). 362 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher. Register 363 // up to RegisterImpl::number_of_registers) are the 64-bit 364 // integer registers. 365 366 // Note: the INPUTS in sig_bt are in units of Java argument words, which are 367 // either 32-bit or 64-bit depending on the build. The OUTPUTS are in 32-bit 368 // units regardless of build. Of course for i486 there is no 64 bit build 369 370 // The Java calling convention is a "shifted" version of the C ABI. 371 // By skipping the first C ABI register we can call non-static jni methods 372 // with small numbers of arguments without having to shuffle the arguments 373 // at all. Since we control the java ABI we ought to at least get some 374 // advantage out of it. 375 376 int SharedRuntime::java_calling_convention(const BasicType *sig_bt, 377 VMRegPair *regs, 378 int total_args_passed, 379 int is_outgoing) { 380 381 // Create the mapping between argument positions and 382 // registers. 383 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = { 384 j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5 385 }; 386 static const XMMRegister FP_ArgReg[Argument::n_float_register_parameters_j] = { 387 j_farg0, j_farg1, j_farg2, j_farg3, 388 j_farg4, j_farg5, j_farg6, j_farg7 389 }; 390 391 392 uint int_args = 0; 393 uint fp_args = 0; 394 uint stk_args = 0; // inc by 2 each time 395 396 for (int i = 0; i < total_args_passed; i++) { 397 switch (sig_bt[i]) { 398 case T_BOOLEAN: 399 case T_CHAR: 400 case T_BYTE: 401 case T_SHORT: 402 case T_INT: 403 if (int_args < Argument::n_int_register_parameters_j) { 404 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); 405 } else { 406 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 407 stk_args += 2; 408 } 409 break; 410 case T_VOID: 411 // halves of T_LONG or T_DOUBLE 412 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); 413 regs[i].set_bad(); 414 break; 415 case T_LONG: 416 assert(sig_bt[i + 1] == T_VOID, "expecting half"); 417 // fall through 418 case T_OBJECT: 419 case T_ARRAY: 420 case T_ADDRESS: 421 if (int_args < Argument::n_int_register_parameters_j) { 422 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); 423 } else { 424 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 425 stk_args += 2; 426 } 427 break; 428 case T_FLOAT: 429 if (fp_args < Argument::n_float_register_parameters_j) { 430 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); 431 } else { 432 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 433 stk_args += 2; 434 } 435 break; 436 case T_DOUBLE: 437 assert(sig_bt[i + 1] == T_VOID, "expecting half"); 438 if (fp_args < Argument::n_float_register_parameters_j) { 439 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); 440 } else { 441 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 442 stk_args += 2; 443 } 444 break; 445 default: 446 ShouldNotReachHere(); 447 break; 448 } 449 } 450 451 return round_to(stk_args, 2); 452 } 453 454 // Patch the callers callsite with entry to compiled code if it exists. 455 static void patch_callers_callsite(MacroAssembler *masm) { 456 Label L; 457 __ cmpptr(Address(rbx, in_bytes(Method::code_offset())), (int32_t)NULL_WORD); 458 __ jcc(Assembler::equal, L); 459 460 // Save the current stack pointer 461 __ mov(r13, rsp); 462 // Schedule the branch target address early. 463 // Call into the VM to patch the caller, then jump to compiled callee 464 // rax isn't live so capture return address while we easily can 465 __ movptr(rax, Address(rsp, 0)); 466 467 // align stack so push_CPU_state doesn't fault 468 __ andptr(rsp, -(StackAlignmentInBytes)); 469 __ push_CPU_state(); 470 471 // VM needs caller's callsite 472 // VM needs target method 473 // This needs to be a long call since we will relocate this adapter to 474 // the codeBuffer and it may not reach 475 476 // Allocate argument register save area 477 if (frame::arg_reg_save_area_bytes != 0) { 478 __ subptr(rsp, frame::arg_reg_save_area_bytes); 479 } 480 __ mov(c_rarg0, rbx); 481 __ mov(c_rarg1, rax); 482 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite))); 483 484 // De-allocate argument register save area 485 if (frame::arg_reg_save_area_bytes != 0) { 486 __ addptr(rsp, frame::arg_reg_save_area_bytes); 487 } 488 489 __ pop_CPU_state(); 490 // restore sp 491 __ mov(rsp, r13); 492 __ bind(L); 493 } 494 495 496 static void gen_c2i_adapter(MacroAssembler *masm, 497 int total_args_passed, 498 int comp_args_on_stack, 499 const BasicType *sig_bt, 500 const VMRegPair *regs, 501 Label& skip_fixup) { 502 // Before we get into the guts of the C2I adapter, see if we should be here 503 // at all. We've come from compiled code and are attempting to jump to the 504 // interpreter, which means the caller made a static call to get here 505 // (vcalls always get a compiled target if there is one). Check for a 506 // compiled target. If there is one, we need to patch the caller's call. 507 patch_callers_callsite(masm); 508 509 __ bind(skip_fixup); 510 511 // Since all args are passed on the stack, total_args_passed * 512 // Interpreter::stackElementSize is the space we need. Plus 1 because 513 // we also account for the return address location since 514 // we store it first rather than hold it in rax across all the shuffling 515 516 int extraspace = (total_args_passed * Interpreter::stackElementSize) + wordSize; 517 518 // stack is aligned, keep it that way 519 extraspace = round_to(extraspace, 2*wordSize); 520 521 // Get return address 522 __ pop(rax); 523 524 // set senderSP value 525 __ mov(r13, rsp); 526 527 __ subptr(rsp, extraspace); 528 529 // Store the return address in the expected location 530 __ movptr(Address(rsp, 0), rax); 531 532 // Now write the args into the outgoing interpreter space 533 for (int i = 0; i < total_args_passed; i++) { 534 if (sig_bt[i] == T_VOID) { 535 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); 536 continue; 537 } 538 539 // offset to start parameters 540 int st_off = (total_args_passed - i) * Interpreter::stackElementSize; 541 int next_off = st_off - Interpreter::stackElementSize; 542 543 // Say 4 args: 544 // i st_off 545 // 0 32 T_LONG 546 // 1 24 T_VOID 547 // 2 16 T_OBJECT 548 // 3 8 T_BOOL 549 // - 0 return address 550 // 551 // However to make thing extra confusing. Because we can fit a long/double in 552 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter 553 // leaves one slot empty and only stores to a single slot. In this case the 554 // slot that is occupied is the T_VOID slot. See I said it was confusing. 555 556 VMReg r_1 = regs[i].first(); 557 VMReg r_2 = regs[i].second(); 558 if (!r_1->is_valid()) { 559 assert(!r_2->is_valid(), ""); 560 continue; 561 } 562 if (r_1->is_stack()) { 563 // memory to memory use rax 564 int ld_off = r_1->reg2stack() * VMRegImpl::stack_slot_size + extraspace; 565 if (!r_2->is_valid()) { 566 // sign extend?? 567 __ movl(rax, Address(rsp, ld_off)); 568 __ movptr(Address(rsp, st_off), rax); 569 570 } else { 571 572 __ movq(rax, Address(rsp, ld_off)); 573 574 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG 575 // T_DOUBLE and T_LONG use two slots in the interpreter 576 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { 577 // ld_off == LSW, ld_off+wordSize == MSW 578 // st_off == MSW, next_off == LSW 579 __ movq(Address(rsp, next_off), rax); 580 #ifdef ASSERT 581 // Overwrite the unused slot with known junk 582 __ mov64(rax, CONST64(0xdeadffffdeadaaaa)); 583 __ movptr(Address(rsp, st_off), rax); 584 #endif /* ASSERT */ 585 } else { 586 __ movq(Address(rsp, st_off), rax); 587 } 588 } 589 } else if (r_1->is_Register()) { 590 Register r = r_1->as_Register(); 591 if (!r_2->is_valid()) { 592 // must be only an int (or less ) so move only 32bits to slot 593 // why not sign extend?? 594 __ movl(Address(rsp, st_off), r); 595 } else { 596 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG 597 // T_DOUBLE and T_LONG use two slots in the interpreter 598 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { 599 // long/double in gpr 600 #ifdef ASSERT 601 // Overwrite the unused slot with known junk 602 __ mov64(rax, CONST64(0xdeadffffdeadaaab)); 603 __ movptr(Address(rsp, st_off), rax); 604 #endif /* ASSERT */ 605 __ movq(Address(rsp, next_off), r); 606 } else { 607 __ movptr(Address(rsp, st_off), r); 608 } 609 } 610 } else { 611 assert(r_1->is_XMMRegister(), ""); 612 if (!r_2->is_valid()) { 613 // only a float use just part of the slot 614 __ movflt(Address(rsp, st_off), r_1->as_XMMRegister()); 615 } else { 616 #ifdef ASSERT 617 // Overwrite the unused slot with known junk 618 __ mov64(rax, CONST64(0xdeadffffdeadaaac)); 619 __ movptr(Address(rsp, st_off), rax); 620 #endif /* ASSERT */ 621 __ movdbl(Address(rsp, next_off), r_1->as_XMMRegister()); 622 } 623 } 624 } 625 626 // Schedule the branch target address early. 627 __ movptr(rcx, Address(rbx, in_bytes(Method::interpreter_entry_offset()))); 628 __ jmp(rcx); 629 } 630 631 static void range_check(MacroAssembler* masm, Register pc_reg, Register temp_reg, 632 address code_start, address code_end, 633 Label& L_ok) { 634 Label L_fail; 635 __ lea(temp_reg, ExternalAddress(code_start)); 636 __ cmpptr(pc_reg, temp_reg); 637 __ jcc(Assembler::belowEqual, L_fail); 638 __ lea(temp_reg, ExternalAddress(code_end)); 639 __ cmpptr(pc_reg, temp_reg); 640 __ jcc(Assembler::below, L_ok); 641 __ bind(L_fail); 642 } 643 644 static void gen_i2c_adapter(MacroAssembler *masm, 645 int total_args_passed, 646 int comp_args_on_stack, 647 const BasicType *sig_bt, 648 const VMRegPair *regs) { 649 650 // Note: r13 contains the senderSP on entry. We must preserve it since 651 // we may do a i2c -> c2i transition if we lose a race where compiled 652 // code goes non-entrant while we get args ready. 653 // In addition we use r13 to locate all the interpreter args as 654 // we must align the stack to 16 bytes on an i2c entry else we 655 // lose alignment we expect in all compiled code and register 656 // save code can segv when fxsave instructions find improperly 657 // aligned stack pointer. 658 659 // Adapters can be frameless because they do not require the caller 660 // to perform additional cleanup work, such as correcting the stack pointer. 661 // An i2c adapter is frameless because the *caller* frame, which is interpreted, 662 // routinely repairs its own stack pointer (from interpreter_frame_last_sp), 663 // even if a callee has modified the stack pointer. 664 // A c2i adapter is frameless because the *callee* frame, which is interpreted, 665 // routinely repairs its caller's stack pointer (from sender_sp, which is set 666 // up via the senderSP register). 667 // In other words, if *either* the caller or callee is interpreted, we can 668 // get the stack pointer repaired after a call. 669 // This is why c2i and i2c adapters cannot be indefinitely composed. 670 // In particular, if a c2i adapter were to somehow call an i2c adapter, 671 // both caller and callee would be compiled methods, and neither would 672 // clean up the stack pointer changes performed by the two adapters. 673 // If this happens, control eventually transfers back to the compiled 674 // caller, but with an uncorrected stack, causing delayed havoc. 675 676 // Pick up the return address 677 __ movptr(rax, Address(rsp, 0)); 678 679 if (VerifyAdapterCalls && 680 (Interpreter::code() != NULL || StubRoutines::code1() != NULL)) { 681 // So, let's test for cascading c2i/i2c adapters right now. 682 // assert(Interpreter::contains($return_addr) || 683 // StubRoutines::contains($return_addr), 684 // "i2c adapter must return to an interpreter frame"); 685 __ block_comment("verify_i2c { "); 686 Label L_ok; 687 if (Interpreter::code() != NULL) 688 range_check(masm, rax, r11, 689 Interpreter::code()->code_start(), Interpreter::code()->code_end(), 690 L_ok); 691 if (StubRoutines::code1() != NULL) 692 range_check(masm, rax, r11, 693 StubRoutines::code1()->code_begin(), StubRoutines::code1()->code_end(), 694 L_ok); 695 if (StubRoutines::code2() != NULL) 696 range_check(masm, rax, r11, 697 StubRoutines::code2()->code_begin(), StubRoutines::code2()->code_end(), 698 L_ok); 699 const char* msg = "i2c adapter must return to an interpreter frame"; 700 __ block_comment(msg); 701 __ stop(msg); 702 __ bind(L_ok); 703 __ block_comment("} verify_i2ce "); 704 } 705 706 // Must preserve original SP for loading incoming arguments because 707 // we need to align the outgoing SP for compiled code. 708 __ movptr(r11, rsp); 709 710 // Cut-out for having no stack args. Since up to 2 int/oop args are passed 711 // in registers, we will occasionally have no stack args. 712 int comp_words_on_stack = 0; 713 if (comp_args_on_stack) { 714 // Sig words on the stack are greater-than VMRegImpl::stack0. Those in 715 // registers are below. By subtracting stack0, we either get a negative 716 // number (all values in registers) or the maximum stack slot accessed. 717 718 // Convert 4-byte c2 stack slots to words. 719 comp_words_on_stack = round_to(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord; 720 // Round up to miminum stack alignment, in wordSize 721 comp_words_on_stack = round_to(comp_words_on_stack, 2); 722 __ subptr(rsp, comp_words_on_stack * wordSize); 723 } 724 725 726 // Ensure compiled code always sees stack at proper alignment 727 __ andptr(rsp, -16); 728 729 // push the return address and misalign the stack that youngest frame always sees 730 // as far as the placement of the call instruction 731 __ push(rax); 732 733 // Put saved SP in another register 734 const Register saved_sp = rax; 735 __ movptr(saved_sp, r11); 736 737 // Will jump to the compiled code just as if compiled code was doing it. 738 // Pre-load the register-jump target early, to schedule it better. 739 __ movptr(r11, Address(rbx, in_bytes(Method::from_compiled_offset()))); 740 741 // Now generate the shuffle code. Pick up all register args and move the 742 // rest through the floating point stack top. 743 for (int i = 0; i < total_args_passed; i++) { 744 if (sig_bt[i] == T_VOID) { 745 // Longs and doubles are passed in native word order, but misaligned 746 // in the 32-bit build. 747 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); 748 continue; 749 } 750 751 // Pick up 0, 1 or 2 words from SP+offset. 752 753 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(), 754 "scrambled load targets?"); 755 // Load in argument order going down. 756 int ld_off = (total_args_passed - i)*Interpreter::stackElementSize; 757 // Point to interpreter value (vs. tag) 758 int next_off = ld_off - Interpreter::stackElementSize; 759 // 760 // 761 // 762 VMReg r_1 = regs[i].first(); 763 VMReg r_2 = regs[i].second(); 764 if (!r_1->is_valid()) { 765 assert(!r_2->is_valid(), ""); 766 continue; 767 } 768 if (r_1->is_stack()) { 769 // Convert stack slot to an SP offset (+ wordSize to account for return address ) 770 int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size + wordSize; 771 772 // We can use r13 as a temp here because compiled code doesn't need r13 as an input 773 // and if we end up going thru a c2i because of a miss a reasonable value of r13 774 // will be generated. 775 if (!r_2->is_valid()) { 776 // sign extend??? 777 __ movl(r13, Address(saved_sp, ld_off)); 778 __ movptr(Address(rsp, st_off), r13); 779 } else { 780 // 781 // We are using two optoregs. This can be either T_OBJECT, T_ADDRESS, T_LONG, or T_DOUBLE 782 // the interpreter allocates two slots but only uses one for thr T_LONG or T_DOUBLE case 783 // So we must adjust where to pick up the data to match the interpreter. 784 // 785 // Interpreter local[n] == MSW, local[n+1] == LSW however locals 786 // are accessed as negative so LSW is at LOW address 787 788 // ld_off is MSW so get LSW 789 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? 790 next_off : ld_off; 791 __ movq(r13, Address(saved_sp, offset)); 792 // st_off is LSW (i.e. reg.first()) 793 __ movq(Address(rsp, st_off), r13); 794 } 795 } else if (r_1->is_Register()) { // Register argument 796 Register r = r_1->as_Register(); 797 assert(r != rax, "must be different"); 798 if (r_2->is_valid()) { 799 // 800 // We are using two VMRegs. This can be either T_OBJECT, T_ADDRESS, T_LONG, or T_DOUBLE 801 // the interpreter allocates two slots but only uses one for thr T_LONG or T_DOUBLE case 802 // So we must adjust where to pick up the data to match the interpreter. 803 804 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? 805 next_off : ld_off; 806 807 // this can be a misaligned move 808 __ movq(r, Address(saved_sp, offset)); 809 } else { 810 // sign extend and use a full word? 811 __ movl(r, Address(saved_sp, ld_off)); 812 } 813 } else { 814 if (!r_2->is_valid()) { 815 __ movflt(r_1->as_XMMRegister(), Address(saved_sp, ld_off)); 816 } else { 817 __ movdbl(r_1->as_XMMRegister(), Address(saved_sp, next_off)); 818 } 819 } 820 } 821 822 // 6243940 We might end up in handle_wrong_method if 823 // the callee is deoptimized as we race thru here. If that 824 // happens we don't want to take a safepoint because the 825 // caller frame will look interpreted and arguments are now 826 // "compiled" so it is much better to make this transition 827 // invisible to the stack walking code. Unfortunately if 828 // we try and find the callee by normal means a safepoint 829 // is possible. So we stash the desired callee in the thread 830 // and the vm will find there should this case occur. 831 832 __ movptr(Address(r15_thread, JavaThread::callee_target_offset()), rbx); 833 834 // put Method* where a c2i would expect should we end up there 835 // only needed becaus eof c2 resolve stubs return Method* as a result in 836 // rax 837 __ mov(rax, rbx); 838 __ jmp(r11); 839 } 840 841 // --------------------------------------------------------------- 842 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm, 843 int total_args_passed, 844 int comp_args_on_stack, 845 const BasicType *sig_bt, 846 const VMRegPair *regs, 847 AdapterFingerPrint* fingerprint) { 848 address i2c_entry = __ pc(); 849 850 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs); 851 852 // ------------------------------------------------------------------------- 853 // Generate a C2I adapter. On entry we know rbx holds the Method* during calls 854 // to the interpreter. The args start out packed in the compiled layout. They 855 // need to be unpacked into the interpreter layout. This will almost always 856 // require some stack space. We grow the current (compiled) stack, then repack 857 // the args. We finally end in a jump to the generic interpreter entry point. 858 // On exit from the interpreter, the interpreter will restore our SP (lest the 859 // compiled code, which relys solely on SP and not RBP, get sick). 860 861 address c2i_unverified_entry = __ pc(); 862 Label skip_fixup; 863 Label ok; 864 865 Register holder = rax; 866 Register receiver = j_rarg0; 867 Register temp = rbx; 868 869 { 870 __ load_klass(temp, receiver); 871 __ cmpptr(temp, Address(holder, CompiledICHolder::holder_klass_offset())); 872 __ movptr(rbx, Address(holder, CompiledICHolder::holder_method_offset())); 873 __ jcc(Assembler::equal, ok); 874 __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); 875 876 __ bind(ok); 877 // Method might have been compiled since the call site was patched to 878 // interpreted if that is the case treat it as a miss so we can get 879 // the call site corrected. 880 __ cmpptr(Address(rbx, in_bytes(Method::code_offset())), (int32_t)NULL_WORD); 881 __ jcc(Assembler::equal, skip_fixup); 882 __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); 883 } 884 885 address c2i_entry = __ pc(); 886 887 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup); 888 889 __ flush(); 890 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); 891 } 892 893 int SharedRuntime::c_calling_convention(const BasicType *sig_bt, 894 VMRegPair *regs, 895 VMRegPair *regs2, 896 int total_args_passed) { 897 assert(regs2 == NULL, "not needed on x86"); 898 // We return the amount of VMRegImpl stack slots we need to reserve for all 899 // the arguments NOT counting out_preserve_stack_slots. 900 901 // NOTE: These arrays will have to change when c1 is ported 902 #ifdef _WIN64 903 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = { 904 c_rarg0, c_rarg1, c_rarg2, c_rarg3 905 }; 906 static const XMMRegister FP_ArgReg[Argument::n_float_register_parameters_c] = { 907 c_farg0, c_farg1, c_farg2, c_farg3 908 }; 909 #else 910 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = { 911 c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5 912 }; 913 static const XMMRegister FP_ArgReg[Argument::n_float_register_parameters_c] = { 914 c_farg0, c_farg1, c_farg2, c_farg3, 915 c_farg4, c_farg5, c_farg6, c_farg7 916 }; 917 #endif // _WIN64 918 919 920 uint int_args = 0; 921 uint fp_args = 0; 922 uint stk_args = 0; // inc by 2 each time 923 924 for (int i = 0; i < total_args_passed; i++) { 925 switch (sig_bt[i]) { 926 case T_BOOLEAN: 927 case T_CHAR: 928 case T_BYTE: 929 case T_SHORT: 930 case T_INT: 931 if (int_args < Argument::n_int_register_parameters_c) { 932 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); 933 #ifdef _WIN64 934 fp_args++; 935 // Allocate slots for callee to stuff register args the stack. 936 stk_args += 2; 937 #endif 938 } else { 939 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 940 stk_args += 2; 941 } 942 break; 943 case T_LONG: 944 assert(sig_bt[i + 1] == T_VOID, "expecting half"); 945 // fall through 946 case T_OBJECT: 947 case T_ARRAY: 948 case T_ADDRESS: 949 case T_METADATA: 950 if (int_args < Argument::n_int_register_parameters_c) { 951 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); 952 #ifdef _WIN64 953 fp_args++; 954 stk_args += 2; 955 #endif 956 } else { 957 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 958 stk_args += 2; 959 } 960 break; 961 case T_FLOAT: 962 if (fp_args < Argument::n_float_register_parameters_c) { 963 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); 964 #ifdef _WIN64 965 int_args++; 966 // Allocate slots for callee to stuff register args the stack. 967 stk_args += 2; 968 #endif 969 } else { 970 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 971 stk_args += 2; 972 } 973 break; 974 case T_DOUBLE: 975 assert(sig_bt[i + 1] == T_VOID, "expecting half"); 976 if (fp_args < Argument::n_float_register_parameters_c) { 977 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); 978 #ifdef _WIN64 979 int_args++; 980 // Allocate slots for callee to stuff register args the stack. 981 stk_args += 2; 982 #endif 983 } else { 984 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 985 stk_args += 2; 986 } 987 break; 988 case T_VOID: // Halves of longs and doubles 989 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); 990 regs[i].set_bad(); 991 break; 992 default: 993 ShouldNotReachHere(); 994 break; 995 } 996 } 997 #ifdef _WIN64 998 // windows abi requires that we always allocate enough stack space 999 // for 4 64bit registers to be stored down. 1000 if (stk_args < 8) { 1001 stk_args = 8; 1002 } 1003 #endif // _WIN64 1004 1005 return stk_args; 1006 } 1007 1008 // On 64 bit we will store integer like items to the stack as 1009 // 64 bits items (sparc abi) even though java would only store 1010 // 32bits for a parameter. On 32bit it will simply be 32 bits 1011 // So this routine will do 32->32 on 32bit and 32->64 on 64bit 1012 static void move32_64(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { 1013 if (src.first()->is_stack()) { 1014 if (dst.first()->is_stack()) { 1015 // stack to stack 1016 __ movslq(rax, Address(rbp, reg2offset_in(src.first()))); 1017 __ movq(Address(rsp, reg2offset_out(dst.first())), rax); 1018 } else { 1019 // stack to reg 1020 __ movslq(dst.first()->as_Register(), Address(rbp, reg2offset_in(src.first()))); 1021 } 1022 } else if (dst.first()->is_stack()) { 1023 // reg to stack 1024 // Do we really have to sign extend??? 1025 // __ movslq(src.first()->as_Register(), src.first()->as_Register()); 1026 __ movq(Address(rsp, reg2offset_out(dst.first())), src.first()->as_Register()); 1027 } else { 1028 // Do we really have to sign extend??? 1029 // __ movslq(dst.first()->as_Register(), src.first()->as_Register()); 1030 if (dst.first() != src.first()) { 1031 __ movq(dst.first()->as_Register(), src.first()->as_Register()); 1032 } 1033 } 1034 } 1035 1036 static void move_ptr(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { 1037 if (src.first()->is_stack()) { 1038 if (dst.first()->is_stack()) { 1039 // stack to stack 1040 __ movq(rax, Address(rbp, reg2offset_in(src.first()))); 1041 __ movq(Address(rsp, reg2offset_out(dst.first())), rax); 1042 } else { 1043 // stack to reg 1044 __ movq(dst.first()->as_Register(), Address(rbp, reg2offset_in(src.first()))); 1045 } 1046 } else if (dst.first()->is_stack()) { 1047 // reg to stack 1048 __ movq(Address(rsp, reg2offset_out(dst.first())), src.first()->as_Register()); 1049 } else { 1050 if (dst.first() != src.first()) { 1051 __ movq(dst.first()->as_Register(), src.first()->as_Register()); 1052 } 1053 } 1054 } 1055 1056 // An oop arg. Must pass a handle not the oop itself 1057 static void object_move(MacroAssembler* masm, 1058 OopMap* map, 1059 int oop_handle_offset, 1060 int framesize_in_slots, 1061 VMRegPair src, 1062 VMRegPair dst, 1063 bool is_receiver, 1064 int* receiver_offset) { 1065 1066 // must pass a handle. First figure out the location we use as a handle 1067 1068 Register rHandle = dst.first()->is_stack() ? rax : dst.first()->as_Register(); 1069 1070 // See if oop is NULL if it is we need no handle 1071 1072 if (src.first()->is_stack()) { 1073 1074 // Oop is already on the stack as an argument 1075 int offset_in_older_frame = src.first()->reg2stack() + SharedRuntime::out_preserve_stack_slots(); 1076 map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + framesize_in_slots)); 1077 if (is_receiver) { 1078 *receiver_offset = (offset_in_older_frame + framesize_in_slots) * VMRegImpl::stack_slot_size; 1079 } 1080 1081 __ cmpptr(Address(rbp, reg2offset_in(src.first())), (int32_t)NULL_WORD); 1082 __ lea(rHandle, Address(rbp, reg2offset_in(src.first()))); 1083 // conditionally move a NULL 1084 __ cmovptr(Assembler::equal, rHandle, Address(rbp, reg2offset_in(src.first()))); 1085 } else { 1086 1087 // Oop is in an a register we must store it to the space we reserve 1088 // on the stack for oop_handles and pass a handle if oop is non-NULL 1089 1090 const Register rOop = src.first()->as_Register(); 1091 int oop_slot; 1092 if (rOop == j_rarg0) 1093 oop_slot = 0; 1094 else if (rOop == j_rarg1) 1095 oop_slot = 1; 1096 else if (rOop == j_rarg2) 1097 oop_slot = 2; 1098 else if (rOop == j_rarg3) 1099 oop_slot = 3; 1100 else if (rOop == j_rarg4) 1101 oop_slot = 4; 1102 else { 1103 assert(rOop == j_rarg5, "wrong register"); 1104 oop_slot = 5; 1105 } 1106 1107 oop_slot = oop_slot * VMRegImpl::slots_per_word + oop_handle_offset; 1108 int offset = oop_slot*VMRegImpl::stack_slot_size; 1109 1110 map->set_oop(VMRegImpl::stack2reg(oop_slot)); 1111 // Store oop in handle area, may be NULL 1112 __ movptr(Address(rsp, offset), rOop); 1113 if (is_receiver) { 1114 *receiver_offset = offset; 1115 } 1116 1117 __ cmpptr(rOop, (int32_t)NULL_WORD); 1118 __ lea(rHandle, Address(rsp, offset)); 1119 // conditionally move a NULL from the handle area where it was just stored 1120 __ cmovptr(Assembler::equal, rHandle, Address(rsp, offset)); 1121 } 1122 1123 // If arg is on the stack then place it otherwise it is already in correct reg. 1124 if (dst.first()->is_stack()) { 1125 __ movptr(Address(rsp, reg2offset_out(dst.first())), rHandle); 1126 } 1127 } 1128 1129 // A float arg may have to do float reg int reg conversion 1130 static void float_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { 1131 assert(!src.second()->is_valid() && !dst.second()->is_valid(), "bad float_move"); 1132 1133 // The calling conventions assures us that each VMregpair is either 1134 // all really one physical register or adjacent stack slots. 1135 // This greatly simplifies the cases here compared to sparc. 1136 1137 if (src.first()->is_stack()) { 1138 if (dst.first()->is_stack()) { 1139 __ movl(rax, Address(rbp, reg2offset_in(src.first()))); 1140 __ movptr(Address(rsp, reg2offset_out(dst.first())), rax); 1141 } else { 1142 // stack to reg 1143 assert(dst.first()->is_XMMRegister(), "only expect xmm registers as parameters"); 1144 __ movflt(dst.first()->as_XMMRegister(), Address(rbp, reg2offset_in(src.first()))); 1145 } 1146 } else if (dst.first()->is_stack()) { 1147 // reg to stack 1148 assert(src.first()->is_XMMRegister(), "only expect xmm registers as parameters"); 1149 __ movflt(Address(rsp, reg2offset_out(dst.first())), src.first()->as_XMMRegister()); 1150 } else { 1151 // reg to reg 1152 // In theory these overlap but the ordering is such that this is likely a nop 1153 if ( src.first() != dst.first()) { 1154 __ movdbl(dst.first()->as_XMMRegister(), src.first()->as_XMMRegister()); 1155 } 1156 } 1157 } 1158 1159 // A long move 1160 static void long_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { 1161 1162 // The calling conventions assures us that each VMregpair is either 1163 // all really one physical register or adjacent stack slots. 1164 // This greatly simplifies the cases here compared to sparc. 1165 1166 if (src.is_single_phys_reg() ) { 1167 if (dst.is_single_phys_reg()) { 1168 if (dst.first() != src.first()) { 1169 __ mov(dst.first()->as_Register(), src.first()->as_Register()); 1170 } 1171 } else { 1172 assert(dst.is_single_reg(), "not a stack pair"); 1173 __ movq(Address(rsp, reg2offset_out(dst.first())), src.first()->as_Register()); 1174 } 1175 } else if (dst.is_single_phys_reg()) { 1176 assert(src.is_single_reg(), "not a stack pair"); 1177 __ movq(dst.first()->as_Register(), Address(rbp, reg2offset_out(src.first()))); 1178 } else { 1179 assert(src.is_single_reg() && dst.is_single_reg(), "not stack pairs"); 1180 __ movq(rax, Address(rbp, reg2offset_in(src.first()))); 1181 __ movq(Address(rsp, reg2offset_out(dst.first())), rax); 1182 } 1183 } 1184 1185 // A double move 1186 static void double_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { 1187 1188 // The calling conventions assures us that each VMregpair is either 1189 // all really one physical register or adjacent stack slots. 1190 // This greatly simplifies the cases here compared to sparc. 1191 1192 if (src.is_single_phys_reg() ) { 1193 if (dst.is_single_phys_reg()) { 1194 // In theory these overlap but the ordering is such that this is likely a nop 1195 if ( src.first() != dst.first()) { 1196 __ movdbl(dst.first()->as_XMMRegister(), src.first()->as_XMMRegister()); 1197 } 1198 } else { 1199 assert(dst.is_single_reg(), "not a stack pair"); 1200 __ movdbl(Address(rsp, reg2offset_out(dst.first())), src.first()->as_XMMRegister()); 1201 } 1202 } else if (dst.is_single_phys_reg()) { 1203 assert(src.is_single_reg(), "not a stack pair"); 1204 __ movdbl(dst.first()->as_XMMRegister(), Address(rbp, reg2offset_out(src.first()))); 1205 } else { 1206 assert(src.is_single_reg() && dst.is_single_reg(), "not stack pairs"); 1207 __ movq(rax, Address(rbp, reg2offset_in(src.first()))); 1208 __ movq(Address(rsp, reg2offset_out(dst.first())), rax); 1209 } 1210 } 1211 1212 1213 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { 1214 // We always ignore the frame_slots arg and just use the space just below frame pointer 1215 // which by this time is free to use 1216 switch (ret_type) { 1217 case T_FLOAT: 1218 __ movflt(Address(rbp, -wordSize), xmm0); 1219 break; 1220 case T_DOUBLE: 1221 __ movdbl(Address(rbp, -wordSize), xmm0); 1222 break; 1223 case T_VOID: break; 1224 default: { 1225 __ movptr(Address(rbp, -wordSize), rax); 1226 } 1227 } 1228 } 1229 1230 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { 1231 // We always ignore the frame_slots arg and just use the space just below frame pointer 1232 // which by this time is free to use 1233 switch (ret_type) { 1234 case T_FLOAT: 1235 __ movflt(xmm0, Address(rbp, -wordSize)); 1236 break; 1237 case T_DOUBLE: 1238 __ movdbl(xmm0, Address(rbp, -wordSize)); 1239 break; 1240 case T_VOID: break; 1241 default: { 1242 __ movptr(rax, Address(rbp, -wordSize)); 1243 } 1244 } 1245 } 1246 1247 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { 1248 for ( int i = first_arg ; i < arg_count ; i++ ) { 1249 if (args[i].first()->is_Register()) { 1250 __ push(args[i].first()->as_Register()); 1251 } else if (args[i].first()->is_XMMRegister()) { 1252 __ subptr(rsp, 2*wordSize); 1253 __ movdbl(Address(rsp, 0), args[i].first()->as_XMMRegister()); 1254 } 1255 } 1256 } 1257 1258 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { 1259 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) { 1260 if (args[i].first()->is_Register()) { 1261 __ pop(args[i].first()->as_Register()); 1262 } else if (args[i].first()->is_XMMRegister()) { 1263 __ movdbl(args[i].first()->as_XMMRegister(), Address(rsp, 0)); 1264 __ addptr(rsp, 2*wordSize); 1265 } 1266 } 1267 } 1268 1269 1270 static void save_or_restore_arguments(MacroAssembler* masm, 1271 const int stack_slots, 1272 const int total_in_args, 1273 const int arg_save_area, 1274 OopMap* map, 1275 VMRegPair* in_regs, 1276 BasicType* in_sig_bt) { 1277 // if map is non-NULL then the code should store the values, 1278 // otherwise it should load them. 1279 int slot = arg_save_area; 1280 // Save down double word first 1281 for ( int i = 0; i < total_in_args; i++) { 1282 if (in_regs[i].first()->is_XMMRegister() && in_sig_bt[i] == T_DOUBLE) { 1283 int offset = slot * VMRegImpl::stack_slot_size; 1284 slot += VMRegImpl::slots_per_word; 1285 assert(slot <= stack_slots, "overflow"); 1286 if (map != NULL) { 1287 __ movdbl(Address(rsp, offset), in_regs[i].first()->as_XMMRegister()); 1288 } else { 1289 __ movdbl(in_regs[i].first()->as_XMMRegister(), Address(rsp, offset)); 1290 } 1291 } 1292 if (in_regs[i].first()->is_Register() && 1293 (in_sig_bt[i] == T_LONG || in_sig_bt[i] == T_ARRAY)) { 1294 int offset = slot * VMRegImpl::stack_slot_size; 1295 if (map != NULL) { 1296 __ movq(Address(rsp, offset), in_regs[i].first()->as_Register()); 1297 if (in_sig_bt[i] == T_ARRAY) { 1298 map->set_oop(VMRegImpl::stack2reg(slot));; 1299 } 1300 } else { 1301 __ movq(in_regs[i].first()->as_Register(), Address(rsp, offset)); 1302 } 1303 slot += VMRegImpl::slots_per_word; 1304 } 1305 } 1306 // Save or restore single word registers 1307 for ( int i = 0; i < total_in_args; i++) { 1308 if (in_regs[i].first()->is_Register()) { 1309 int offset = slot * VMRegImpl::stack_slot_size; 1310 slot++; 1311 assert(slot <= stack_slots, "overflow"); 1312 1313 // Value is in an input register pass we must flush it to the stack 1314 const Register reg = in_regs[i].first()->as_Register(); 1315 switch (in_sig_bt[i]) { 1316 case T_BOOLEAN: 1317 case T_CHAR: 1318 case T_BYTE: 1319 case T_SHORT: 1320 case T_INT: 1321 if (map != NULL) { 1322 __ movl(Address(rsp, offset), reg); 1323 } else { 1324 __ movl(reg, Address(rsp, offset)); 1325 } 1326 break; 1327 case T_ARRAY: 1328 case T_LONG: 1329 // handled above 1330 break; 1331 case T_OBJECT: 1332 default: ShouldNotReachHere(); 1333 } 1334 } else if (in_regs[i].first()->is_XMMRegister()) { 1335 if (in_sig_bt[i] == T_FLOAT) { 1336 int offset = slot * VMRegImpl::stack_slot_size; 1337 slot++; 1338 assert(slot <= stack_slots, "overflow"); 1339 if (map != NULL) { 1340 __ movflt(Address(rsp, offset), in_regs[i].first()->as_XMMRegister()); 1341 } else { 1342 __ movflt(in_regs[i].first()->as_XMMRegister(), Address(rsp, offset)); 1343 } 1344 } 1345 } else if (in_regs[i].first()->is_stack()) { 1346 if (in_sig_bt[i] == T_ARRAY && map != NULL) { 1347 int offset_in_older_frame = in_regs[i].first()->reg2stack() + SharedRuntime::out_preserve_stack_slots(); 1348 map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + stack_slots)); 1349 } 1350 } 1351 } 1352 } 1353 1354 1355 // Check GC_locker::needs_gc and enter the runtime if it's true. This 1356 // keeps a new JNI critical region from starting until a GC has been 1357 // forced. Save down any oops in registers and describe them in an 1358 // OopMap. 1359 static void check_needs_gc_for_critical_native(MacroAssembler* masm, 1360 int stack_slots, 1361 int total_c_args, 1362 int total_in_args, 1363 int arg_save_area, 1364 OopMapSet* oop_maps, 1365 VMRegPair* in_regs, 1366 BasicType* in_sig_bt) { 1367 __ block_comment("check GC_locker::needs_gc"); 1368 Label cont; 1369 __ cmp8(ExternalAddress((address)GC_locker::needs_gc_address()), false); 1370 __ jcc(Assembler::equal, cont); 1371 1372 // Save down any incoming oops and call into the runtime to halt for a GC 1373 1374 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); 1375 save_or_restore_arguments(masm, stack_slots, total_in_args, 1376 arg_save_area, map, in_regs, in_sig_bt); 1377 1378 address the_pc = __ pc(); 1379 oop_maps->add_gc_map( __ offset(), map); 1380 __ set_last_Java_frame(rsp, noreg, the_pc); 1381 1382 __ block_comment("block_for_jni_critical"); 1383 __ movptr(c_rarg0, r15_thread); 1384 __ mov(r12, rsp); // remember sp 1385 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows 1386 __ andptr(rsp, -16); // align stack as required by ABI 1387 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::block_for_jni_critical))); 1388 __ mov(rsp, r12); // restore sp 1389 __ reinit_heapbase(); 1390 1391 __ reset_last_Java_frame(false, true); 1392 1393 save_or_restore_arguments(masm, stack_slots, total_in_args, 1394 arg_save_area, NULL, in_regs, in_sig_bt); 1395 1396 __ bind(cont); 1397 #ifdef ASSERT 1398 if (StressCriticalJNINatives) { 1399 // Stress register saving 1400 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); 1401 save_or_restore_arguments(masm, stack_slots, total_in_args, 1402 arg_save_area, map, in_regs, in_sig_bt); 1403 // Destroy argument registers 1404 for (int i = 0; i < total_in_args - 1; i++) { 1405 if (in_regs[i].first()->is_Register()) { 1406 const Register reg = in_regs[i].first()->as_Register(); 1407 __ xorptr(reg, reg); 1408 } else if (in_regs[i].first()->is_XMMRegister()) { 1409 __ xorpd(in_regs[i].first()->as_XMMRegister(), in_regs[i].first()->as_XMMRegister()); 1410 } else if (in_regs[i].first()->is_FloatRegister()) { 1411 ShouldNotReachHere(); 1412 } else if (in_regs[i].first()->is_stack()) { 1413 // Nothing to do 1414 } else { 1415 ShouldNotReachHere(); 1416 } 1417 if (in_sig_bt[i] == T_LONG || in_sig_bt[i] == T_DOUBLE) { 1418 i++; 1419 } 1420 } 1421 1422 save_or_restore_arguments(masm, stack_slots, total_in_args, 1423 arg_save_area, NULL, in_regs, in_sig_bt); 1424 } 1425 #endif 1426 } 1427 1428 // Unpack an array argument into a pointer to the body and the length 1429 // if the array is non-null, otherwise pass 0 for both. 1430 static void unpack_array_argument(MacroAssembler* masm, VMRegPair reg, BasicType in_elem_type, VMRegPair body_arg, VMRegPair length_arg) { 1431 Register tmp_reg = rax; 1432 assert(!body_arg.first()->is_Register() || body_arg.first()->as_Register() != tmp_reg, 1433 "possible collision"); 1434 assert(!length_arg.first()->is_Register() || length_arg.first()->as_Register() != tmp_reg, 1435 "possible collision"); 1436 1437 __ block_comment("unpack_array_argument {"); 1438 1439 // Pass the length, ptr pair 1440 Label is_null, done; 1441 VMRegPair tmp; 1442 tmp.set_ptr(tmp_reg->as_VMReg()); 1443 if (reg.first()->is_stack()) { 1444 // Load the arg up from the stack 1445 move_ptr(masm, reg, tmp); 1446 reg = tmp; 1447 } 1448 __ testptr(reg.first()->as_Register(), reg.first()->as_Register()); 1449 __ jccb(Assembler::equal, is_null); 1450 __ lea(tmp_reg, Address(reg.first()->as_Register(), arrayOopDesc::base_offset_in_bytes(in_elem_type))); 1451 move_ptr(masm, tmp, body_arg); 1452 // load the length relative to the body. 1453 __ movl(tmp_reg, Address(tmp_reg, arrayOopDesc::length_offset_in_bytes() - 1454 arrayOopDesc::base_offset_in_bytes(in_elem_type))); 1455 move32_64(masm, tmp, length_arg); 1456 __ jmpb(done); 1457 __ bind(is_null); 1458 // Pass zeros 1459 __ xorptr(tmp_reg, tmp_reg); 1460 move_ptr(masm, tmp, body_arg); 1461 move32_64(masm, tmp, length_arg); 1462 __ bind(done); 1463 1464 __ block_comment("} unpack_array_argument"); 1465 } 1466 1467 1468 // Different signatures may require very different orders for the move 1469 // to avoid clobbering other arguments. There's no simple way to 1470 // order them safely. Compute a safe order for issuing stores and 1471 // break any cycles in those stores. This code is fairly general but 1472 // it's not necessary on the other platforms so we keep it in the 1473 // platform dependent code instead of moving it into a shared file. 1474 // (See bugs 7013347 & 7145024.) 1475 // Note that this code is specific to LP64. 1476 class ComputeMoveOrder: public StackObj { 1477 class MoveOperation: public ResourceObj { 1478 friend class ComputeMoveOrder; 1479 private: 1480 VMRegPair _src; 1481 VMRegPair _dst; 1482 int _src_index; 1483 int _dst_index; 1484 bool _processed; 1485 MoveOperation* _next; 1486 MoveOperation* _prev; 1487 1488 static int get_id(VMRegPair r) { 1489 return r.first()->value(); 1490 } 1491 1492 public: 1493 MoveOperation(int src_index, VMRegPair src, int dst_index, VMRegPair dst): 1494 _src(src) 1495 , _src_index(src_index) 1496 , _dst(dst) 1497 , _dst_index(dst_index) 1498 , _next(NULL) 1499 , _prev(NULL) 1500 , _processed(false) { 1501 } 1502 1503 VMRegPair src() const { return _src; } 1504 int src_id() const { return get_id(src()); } 1505 int src_index() const { return _src_index; } 1506 VMRegPair dst() const { return _dst; } 1507 void set_dst(int i, VMRegPair dst) { _dst_index = i, _dst = dst; } 1508 int dst_index() const { return _dst_index; } 1509 int dst_id() const { return get_id(dst()); } 1510 MoveOperation* next() const { return _next; } 1511 MoveOperation* prev() const { return _prev; } 1512 void set_processed() { _processed = true; } 1513 bool is_processed() const { return _processed; } 1514 1515 // insert 1516 void break_cycle(VMRegPair temp_register) { 1517 // create a new store following the last store 1518 // to move from the temp_register to the original 1519 MoveOperation* new_store = new MoveOperation(-1, temp_register, dst_index(), dst()); 1520 1521 // break the cycle of links and insert new_store at the end 1522 // break the reverse link. 1523 MoveOperation* p = prev(); 1524 assert(p->next() == this, "must be"); 1525 _prev = NULL; 1526 p->_next = new_store; 1527 new_store->_prev = p; 1528 1529 // change the original store to save it's value in the temp. 1530 set_dst(-1, temp_register); 1531 } 1532 1533 void link(GrowableArray<MoveOperation*>& killer) { 1534 // link this store in front the store that it depends on 1535 MoveOperation* n = killer.at_grow(src_id(), NULL); 1536 if (n != NULL) { 1537 assert(_next == NULL && n->_prev == NULL, "shouldn't have been set yet"); 1538 _next = n; 1539 n->_prev = this; 1540 } 1541 } 1542 }; 1543 1544 private: 1545 GrowableArray<MoveOperation*> edges; 1546 1547 public: 1548 ComputeMoveOrder(int total_in_args, VMRegPair* in_regs, int total_c_args, VMRegPair* out_regs, 1549 BasicType* in_sig_bt, GrowableArray<int>& arg_order, VMRegPair tmp_vmreg) { 1550 // Move operations where the dest is the stack can all be 1551 // scheduled first since they can't interfere with the other moves. 1552 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) { 1553 if (in_sig_bt[i] == T_ARRAY) { 1554 c_arg--; 1555 if (out_regs[c_arg].first()->is_stack() && 1556 out_regs[c_arg + 1].first()->is_stack()) { 1557 arg_order.push(i); 1558 arg_order.push(c_arg); 1559 } else { 1560 if (out_regs[c_arg].first()->is_stack() || 1561 in_regs[i].first() == out_regs[c_arg].first()) { 1562 add_edge(i, in_regs[i].first(), c_arg, out_regs[c_arg + 1]); 1563 } else { 1564 add_edge(i, in_regs[i].first(), c_arg, out_regs[c_arg]); 1565 } 1566 } 1567 } else if (in_sig_bt[i] == T_VOID) { 1568 arg_order.push(i); 1569 arg_order.push(c_arg); 1570 } else { 1571 if (out_regs[c_arg].first()->is_stack() || 1572 in_regs[i].first() == out_regs[c_arg].first()) { 1573 arg_order.push(i); 1574 arg_order.push(c_arg); 1575 } else { 1576 add_edge(i, in_regs[i].first(), c_arg, out_regs[c_arg]); 1577 } 1578 } 1579 } 1580 // Break any cycles in the register moves and emit the in the 1581 // proper order. 1582 GrowableArray<MoveOperation*>* stores = get_store_order(tmp_vmreg); 1583 for (int i = 0; i < stores->length(); i++) { 1584 arg_order.push(stores->at(i)->src_index()); 1585 arg_order.push(stores->at(i)->dst_index()); 1586 } 1587 } 1588 1589 // Collected all the move operations 1590 void add_edge(int src_index, VMRegPair src, int dst_index, VMRegPair dst) { 1591 if (src.first() == dst.first()) return; 1592 edges.append(new MoveOperation(src_index, src, dst_index, dst)); 1593 } 1594 1595 // Walk the edges breaking cycles between moves. The result list 1596 // can be walked in order to produce the proper set of loads 1597 GrowableArray<MoveOperation*>* get_store_order(VMRegPair temp_register) { 1598 // Record which moves kill which values 1599 GrowableArray<MoveOperation*> killer; 1600 for (int i = 0; i < edges.length(); i++) { 1601 MoveOperation* s = edges.at(i); 1602 assert(killer.at_grow(s->dst_id(), NULL) == NULL, "only one killer"); 1603 killer.at_put_grow(s->dst_id(), s, NULL); 1604 } 1605 assert(killer.at_grow(MoveOperation::get_id(temp_register), NULL) == NULL, 1606 "make sure temp isn't in the registers that are killed"); 1607 1608 // create links between loads and stores 1609 for (int i = 0; i < edges.length(); i++) { 1610 edges.at(i)->link(killer); 1611 } 1612 1613 // at this point, all the move operations are chained together 1614 // in a doubly linked list. Processing it backwards finds 1615 // the beginning of the chain, forwards finds the end. If there's 1616 // a cycle it can be broken at any point, so pick an edge and walk 1617 // backward until the list ends or we end where we started. 1618 GrowableArray<MoveOperation*>* stores = new GrowableArray<MoveOperation*>(); 1619 for (int e = 0; e < edges.length(); e++) { 1620 MoveOperation* s = edges.at(e); 1621 if (!s->is_processed()) { 1622 MoveOperation* start = s; 1623 // search for the beginning of the chain or cycle 1624 while (start->prev() != NULL && start->prev() != s) { 1625 start = start->prev(); 1626 } 1627 if (start->prev() == s) { 1628 start->break_cycle(temp_register); 1629 } 1630 // walk the chain forward inserting to store list 1631 while (start != NULL) { 1632 stores->append(start); 1633 start->set_processed(); 1634 start = start->next(); 1635 } 1636 } 1637 } 1638 return stores; 1639 } 1640 }; 1641 1642 static void verify_oop_args(MacroAssembler* masm, 1643 methodHandle method, 1644 const BasicType* sig_bt, 1645 const VMRegPair* regs) { 1646 Register temp_reg = rbx; // not part of any compiled calling seq 1647 if (VerifyOops) { 1648 for (int i = 0; i < method->size_of_parameters(); i++) { 1649 if (sig_bt[i] == T_OBJECT || 1650 sig_bt[i] == T_ARRAY) { 1651 VMReg r = regs[i].first(); 1652 assert(r->is_valid(), "bad oop arg"); 1653 if (r->is_stack()) { 1654 __ movptr(temp_reg, Address(rsp, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize)); 1655 __ verify_oop(temp_reg); 1656 } else { 1657 __ verify_oop(r->as_Register()); 1658 } 1659 } 1660 } 1661 } 1662 } 1663 1664 static void gen_special_dispatch(MacroAssembler* masm, 1665 methodHandle method, 1666 const BasicType* sig_bt, 1667 const VMRegPair* regs) { 1668 verify_oop_args(masm, method, sig_bt, regs); 1669 vmIntrinsics::ID iid = method->intrinsic_id(); 1670 1671 // Now write the args into the outgoing interpreter space 1672 bool has_receiver = false; 1673 Register receiver_reg = noreg; 1674 int member_arg_pos = -1; 1675 Register member_reg = noreg; 1676 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid); 1677 if (ref_kind != 0) { 1678 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument 1679 member_reg = rbx; // known to be free at this point 1680 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind); 1681 } else if (iid == vmIntrinsics::_invokeBasic) { 1682 has_receiver = true; 1683 } else { 1684 fatal(err_msg_res("unexpected intrinsic id %d", iid)); 1685 } 1686 1687 if (member_reg != noreg) { 1688 // Load the member_arg into register, if necessary. 1689 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs); 1690 VMReg r = regs[member_arg_pos].first(); 1691 if (r->is_stack()) { 1692 __ movptr(member_reg, Address(rsp, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize)); 1693 } else { 1694 // no data motion is needed 1695 member_reg = r->as_Register(); 1696 } 1697 } 1698 1699 if (has_receiver) { 1700 // Make sure the receiver is loaded into a register. 1701 assert(method->size_of_parameters() > 0, "oob"); 1702 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object"); 1703 VMReg r = regs[0].first(); 1704 assert(r->is_valid(), "bad receiver arg"); 1705 if (r->is_stack()) { 1706 // Porting note: This assumes that compiled calling conventions always 1707 // pass the receiver oop in a register. If this is not true on some 1708 // platform, pick a temp and load the receiver from stack. 1709 fatal("receiver always in a register"); 1710 receiver_reg = j_rarg0; // known to be free at this point 1711 __ movptr(receiver_reg, Address(rsp, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize)); 1712 } else { 1713 // no data motion is needed 1714 receiver_reg = r->as_Register(); 1715 } 1716 } 1717 1718 // Figure out which address we are really jumping to: 1719 MethodHandles::generate_method_handle_dispatch(masm, iid, 1720 receiver_reg, member_reg, /*for_compiler_entry:*/ true); 1721 } 1722 1723 // --------------------------------------------------------------------------- 1724 // Generate a native wrapper for a given method. The method takes arguments 1725 // in the Java compiled code convention, marshals them to the native 1726 // convention (handlizes oops, etc), transitions to native, makes the call, 1727 // returns to java state (possibly blocking), unhandlizes any result and 1728 // returns. 1729 // 1730 // Critical native functions are a shorthand for the use of 1731 // GetPrimtiveArrayCritical and disallow the use of any other JNI 1732 // functions. The wrapper is expected to unpack the arguments before 1733 // passing them to the callee and perform checks before and after the 1734 // native call to ensure that they GC_locker 1735 // lock_critical/unlock_critical semantics are followed. Some other 1736 // parts of JNI setup are skipped like the tear down of the JNI handle 1737 // block and the check for pending exceptions it's impossible for them 1738 // to be thrown. 1739 // 1740 // They are roughly structured like this: 1741 // if (GC_locker::needs_gc()) 1742 // SharedRuntime::block_for_jni_critical(); 1743 // tranistion to thread_in_native 1744 // unpack arrray arguments and call native entry point 1745 // check for safepoint in progress 1746 // check if any thread suspend flags are set 1747 // call into JVM and possible unlock the JNI critical 1748 // if a GC was suppressed while in the critical native. 1749 // transition back to thread_in_Java 1750 // return to caller 1751 // 1752 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm, 1753 methodHandle method, 1754 int compile_id, 1755 BasicType* in_sig_bt, 1756 VMRegPair* in_regs, 1757 BasicType ret_type) { 1758 if (method->is_method_handle_intrinsic()) { 1759 vmIntrinsics::ID iid = method->intrinsic_id(); 1760 intptr_t start = (intptr_t)__ pc(); 1761 int vep_offset = ((intptr_t)__ pc()) - start; 1762 gen_special_dispatch(masm, 1763 method, 1764 in_sig_bt, 1765 in_regs); 1766 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period 1767 __ flush(); 1768 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually 1769 return nmethod::new_native_nmethod(method, 1770 compile_id, 1771 masm->code(), 1772 vep_offset, 1773 frame_complete, 1774 stack_slots / VMRegImpl::slots_per_word, 1775 in_ByteSize(-1), 1776 in_ByteSize(-1), 1777 (OopMapSet*)NULL); 1778 } 1779 bool is_critical_native = true; 1780 address native_func = method->critical_native_function(); 1781 if (native_func == NULL) { 1782 native_func = method->native_function(); 1783 is_critical_native = false; 1784 } 1785 assert(native_func != NULL, "must have function"); 1786 1787 // An OopMap for lock (and class if static) 1788 OopMapSet *oop_maps = new OopMapSet(); 1789 intptr_t start = (intptr_t)__ pc(); 1790 1791 // We have received a description of where all the java arg are located 1792 // on entry to the wrapper. We need to convert these args to where 1793 // the jni function will expect them. To figure out where they go 1794 // we convert the java signature to a C signature by inserting 1795 // the hidden arguments as arg[0] and possibly arg[1] (static method) 1796 1797 const int total_in_args = method->size_of_parameters(); 1798 int total_c_args = total_in_args; 1799 if (!is_critical_native) { 1800 total_c_args += 1; 1801 if (method->is_static()) { 1802 total_c_args++; 1803 } 1804 } else { 1805 for (int i = 0; i < total_in_args; i++) { 1806 if (in_sig_bt[i] == T_ARRAY) { 1807 total_c_args++; 1808 } 1809 } 1810 } 1811 1812 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args); 1813 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args); 1814 BasicType* in_elem_bt = NULL; 1815 1816 int argc = 0; 1817 if (!is_critical_native) { 1818 out_sig_bt[argc++] = T_ADDRESS; 1819 if (method->is_static()) { 1820 out_sig_bt[argc++] = T_OBJECT; 1821 } 1822 1823 for (int i = 0; i < total_in_args ; i++ ) { 1824 out_sig_bt[argc++] = in_sig_bt[i]; 1825 } 1826 } else { 1827 Thread* THREAD = Thread::current(); 1828 in_elem_bt = NEW_RESOURCE_ARRAY(BasicType, total_in_args); 1829 SignatureStream ss(method->signature()); 1830 for (int i = 0; i < total_in_args ; i++ ) { 1831 if (in_sig_bt[i] == T_ARRAY) { 1832 // Arrays are passed as int, elem* pair 1833 out_sig_bt[argc++] = T_INT; 1834 out_sig_bt[argc++] = T_ADDRESS; 1835 Symbol* atype = ss.as_symbol(CHECK_NULL); 1836 const char* at = atype->as_C_string(); 1837 if (strlen(at) == 2) { 1838 assert(at[0] == '[', "must be"); 1839 switch (at[1]) { 1840 case 'B': in_elem_bt[i] = T_BYTE; break; 1841 case 'C': in_elem_bt[i] = T_CHAR; break; 1842 case 'D': in_elem_bt[i] = T_DOUBLE; break; 1843 case 'F': in_elem_bt[i] = T_FLOAT; break; 1844 case 'I': in_elem_bt[i] = T_INT; break; 1845 case 'J': in_elem_bt[i] = T_LONG; break; 1846 case 'S': in_elem_bt[i] = T_SHORT; break; 1847 case 'Z': in_elem_bt[i] = T_BOOLEAN; break; 1848 default: ShouldNotReachHere(); 1849 } 1850 } 1851 } else { 1852 out_sig_bt[argc++] = in_sig_bt[i]; 1853 in_elem_bt[i] = T_VOID; 1854 } 1855 if (in_sig_bt[i] != T_VOID) { 1856 assert(in_sig_bt[i] == ss.type(), "must match"); 1857 ss.next(); 1858 } 1859 } 1860 } 1861 1862 // Now figure out where the args must be stored and how much stack space 1863 // they require. 1864 int out_arg_slots; 1865 out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args); 1866 1867 // Compute framesize for the wrapper. We need to handlize all oops in 1868 // incoming registers 1869 1870 // Calculate the total number of stack slots we will need. 1871 1872 // First count the abi requirement plus all of the outgoing args 1873 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots; 1874 1875 // Now the space for the inbound oop handle area 1876 int total_save_slots = 6 * VMRegImpl::slots_per_word; // 6 arguments passed in registers 1877 if (is_critical_native) { 1878 // Critical natives may have to call out so they need a save area 1879 // for register arguments. 1880 int double_slots = 0; 1881 int single_slots = 0; 1882 for ( int i = 0; i < total_in_args; i++) { 1883 if (in_regs[i].first()->is_Register()) { 1884 const Register reg = in_regs[i].first()->as_Register(); 1885 switch (in_sig_bt[i]) { 1886 case T_BOOLEAN: 1887 case T_BYTE: 1888 case T_SHORT: 1889 case T_CHAR: 1890 case T_INT: single_slots++; break; 1891 case T_ARRAY: // specific to LP64 (7145024) 1892 case T_LONG: double_slots++; break; 1893 default: ShouldNotReachHere(); 1894 } 1895 } else if (in_regs[i].first()->is_XMMRegister()) { 1896 switch (in_sig_bt[i]) { 1897 case T_FLOAT: single_slots++; break; 1898 case T_DOUBLE: double_slots++; break; 1899 default: ShouldNotReachHere(); 1900 } 1901 } else if (in_regs[i].first()->is_FloatRegister()) { 1902 ShouldNotReachHere(); 1903 } 1904 } 1905 total_save_slots = double_slots * 2 + single_slots; 1906 // align the save area 1907 if (double_slots != 0) { 1908 stack_slots = round_to(stack_slots, 2); 1909 } 1910 } 1911 1912 int oop_handle_offset = stack_slots; 1913 stack_slots += total_save_slots; 1914 1915 // Now any space we need for handlizing a klass if static method 1916 1917 int klass_slot_offset = 0; 1918 int klass_offset = -1; 1919 int lock_slot_offset = 0; 1920 bool is_static = false; 1921 1922 if (method->is_static()) { 1923 klass_slot_offset = stack_slots; 1924 stack_slots += VMRegImpl::slots_per_word; 1925 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size; 1926 is_static = true; 1927 } 1928 1929 // Plus a lock if needed 1930 1931 if (method->is_synchronized()) { 1932 lock_slot_offset = stack_slots; 1933 stack_slots += VMRegImpl::slots_per_word; 1934 } 1935 1936 // Now a place (+2) to save return values or temp during shuffling 1937 // + 4 for return address (which we own) and saved rbp 1938 stack_slots += 6; 1939 1940 // Ok The space we have allocated will look like: 1941 // 1942 // 1943 // FP-> | | 1944 // |---------------------| 1945 // | 2 slots for moves | 1946 // |---------------------| 1947 // | lock box (if sync) | 1948 // |---------------------| <- lock_slot_offset 1949 // | klass (if static) | 1950 // |---------------------| <- klass_slot_offset 1951 // | oopHandle area | 1952 // |---------------------| <- oop_handle_offset (6 java arg registers) 1953 // | outbound memory | 1954 // | based arguments | 1955 // | | 1956 // |---------------------| 1957 // | | 1958 // SP-> | out_preserved_slots | 1959 // 1960 // 1961 1962 1963 // Now compute actual number of stack words we need rounding to make 1964 // stack properly aligned. 1965 stack_slots = round_to(stack_slots, StackAlignmentInSlots); 1966 1967 int stack_size = stack_slots * VMRegImpl::stack_slot_size; 1968 1969 // First thing make an ic check to see if we should even be here 1970 1971 // We are free to use all registers as temps without saving them and 1972 // restoring them except rbp. rbp is the only callee save register 1973 // as far as the interpreter and the compiler(s) are concerned. 1974 1975 1976 const Register ic_reg = rax; 1977 const Register receiver = j_rarg0; 1978 1979 Label hit; 1980 Label exception_pending; 1981 1982 assert_different_registers(ic_reg, receiver, rscratch1); 1983 __ verify_oop(receiver); 1984 __ load_klass(rscratch1, receiver); 1985 __ cmpq(ic_reg, rscratch1); 1986 __ jcc(Assembler::equal, hit); 1987 1988 __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); 1989 1990 // Verified entry point must be aligned 1991 __ align(8); 1992 1993 __ bind(hit); 1994 1995 int vep_offset = ((intptr_t)__ pc()) - start; 1996 1997 // The instruction at the verified entry point must be 5 bytes or longer 1998 // because it can be patched on the fly by make_non_entrant. The stack bang 1999 // instruction fits that requirement. 2000 2001 // Generate stack overflow check 2002 2003 if (UseStackBanging) { 2004 __ bang_stack_with_offset(StackShadowPages*os::vm_page_size()); 2005 } else { 2006 // need a 5 byte instruction to allow MT safe patching to non-entrant 2007 __ fat_nop(); 2008 } 2009 2010 // Generate a new frame for the wrapper. 2011 __ enter(); 2012 // -2 because return address is already present and so is saved rbp 2013 __ subptr(rsp, stack_size - 2*wordSize); 2014 2015 // Frame is now completed as far as size and linkage. 2016 int frame_complete = ((intptr_t)__ pc()) - start; 2017 2018 if (UseRTMLocking) { 2019 // Abort RTM transaction before calling JNI 2020 // because critical section will be large and will be 2021 // aborted anyway. Also nmethod could be deoptimized. 2022 __ xabort(0); 2023 } 2024 2025 #ifdef ASSERT 2026 { 2027 Label L; 2028 __ mov(rax, rsp); 2029 __ andptr(rax, -16); // must be 16 byte boundary (see amd64 ABI) 2030 __ cmpptr(rax, rsp); 2031 __ jcc(Assembler::equal, L); 2032 __ stop("improperly aligned stack"); 2033 __ bind(L); 2034 } 2035 #endif /* ASSERT */ 2036 2037 2038 // We use r14 as the oop handle for the receiver/klass 2039 // It is callee save so it survives the call to native 2040 2041 const Register oop_handle_reg = r14; 2042 2043 if (is_critical_native) { 2044 check_needs_gc_for_critical_native(masm, stack_slots, total_c_args, total_in_args, 2045 oop_handle_offset, oop_maps, in_regs, in_sig_bt); 2046 } 2047 2048 // 2049 // We immediately shuffle the arguments so that any vm call we have to 2050 // make from here on out (sync slow path, jvmti, etc.) we will have 2051 // captured the oops from our caller and have a valid oopMap for 2052 // them. 2053 2054 // ----------------- 2055 // The Grand Shuffle 2056 2057 // The Java calling convention is either equal (linux) or denser (win64) than the 2058 // c calling convention. However the because of the jni_env argument the c calling 2059 // convention always has at least one more (and two for static) arguments than Java. 2060 // Therefore if we move the args from java -> c backwards then we will never have 2061 // a register->register conflict and we don't have to build a dependency graph 2062 // and figure out how to break any cycles. 2063 // 2064 2065 // Record esp-based slot for receiver on stack for non-static methods 2066 int receiver_offset = -1; 2067 2068 // This is a trick. We double the stack slots so we can claim 2069 // the oops in the caller's frame. Since we are sure to have 2070 // more args than the caller doubling is enough to make 2071 // sure we can capture all the incoming oop args from the 2072 // caller. 2073 // 2074 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); 2075 2076 // Mark location of rbp (someday) 2077 // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rbp)); 2078 2079 // Use eax, ebx as temporaries during any memory-memory moves we have to do 2080 // All inbound args are referenced based on rbp and all outbound args via rsp. 2081 2082 2083 #ifdef ASSERT 2084 bool reg_destroyed[RegisterImpl::number_of_registers]; 2085 bool freg_destroyed[XMMRegisterImpl::number_of_registers]; 2086 for ( int r = 0 ; r < RegisterImpl::number_of_registers ; r++ ) { 2087 reg_destroyed[r] = false; 2088 } 2089 for ( int f = 0 ; f < XMMRegisterImpl::number_of_registers ; f++ ) { 2090 freg_destroyed[f] = false; 2091 } 2092 2093 #endif /* ASSERT */ 2094 2095 // This may iterate in two different directions depending on the 2096 // kind of native it is. The reason is that for regular JNI natives 2097 // the incoming and outgoing registers are offset upwards and for 2098 // critical natives they are offset down. 2099 GrowableArray<int> arg_order(2 * total_in_args); 2100 VMRegPair tmp_vmreg; 2101 tmp_vmreg.set1(rbx->as_VMReg()); 2102 2103 if (!is_critical_native) { 2104 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) { 2105 arg_order.push(i); 2106 arg_order.push(c_arg); 2107 } 2108 } else { 2109 // Compute a valid move order, using tmp_vmreg to break any cycles 2110 ComputeMoveOrder cmo(total_in_args, in_regs, total_c_args, out_regs, in_sig_bt, arg_order, tmp_vmreg); 2111 } 2112 2113 int temploc = -1; 2114 for (int ai = 0; ai < arg_order.length(); ai += 2) { 2115 int i = arg_order.at(ai); 2116 int c_arg = arg_order.at(ai + 1); 2117 __ block_comment(err_msg("move %d -> %d", i, c_arg)); 2118 if (c_arg == -1) { 2119 assert(is_critical_native, "should only be required for critical natives"); 2120 // This arg needs to be moved to a temporary 2121 __ mov(tmp_vmreg.first()->as_Register(), in_regs[i].first()->as_Register()); 2122 in_regs[i] = tmp_vmreg; 2123 temploc = i; 2124 continue; 2125 } else if (i == -1) { 2126 assert(is_critical_native, "should only be required for critical natives"); 2127 // Read from the temporary location 2128 assert(temploc != -1, "must be valid"); 2129 i = temploc; 2130 temploc = -1; 2131 } 2132 #ifdef ASSERT 2133 if (in_regs[i].first()->is_Register()) { 2134 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!"); 2135 } else if (in_regs[i].first()->is_XMMRegister()) { 2136 assert(!freg_destroyed[in_regs[i].first()->as_XMMRegister()->encoding()], "destroyed reg!"); 2137 } 2138 if (out_regs[c_arg].first()->is_Register()) { 2139 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true; 2140 } else if (out_regs[c_arg].first()->is_XMMRegister()) { 2141 freg_destroyed[out_regs[c_arg].first()->as_XMMRegister()->encoding()] = true; 2142 } 2143 #endif /* ASSERT */ 2144 switch (in_sig_bt[i]) { 2145 case T_ARRAY: 2146 if (is_critical_native) { 2147 unpack_array_argument(masm, in_regs[i], in_elem_bt[i], out_regs[c_arg + 1], out_regs[c_arg]); 2148 c_arg++; 2149 #ifdef ASSERT 2150 if (out_regs[c_arg].first()->is_Register()) { 2151 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true; 2152 } else if (out_regs[c_arg].first()->is_XMMRegister()) { 2153 freg_destroyed[out_regs[c_arg].first()->as_XMMRegister()->encoding()] = true; 2154 } 2155 #endif 2156 break; 2157 } 2158 case T_OBJECT: 2159 assert(!is_critical_native, "no oop arguments"); 2160 object_move(masm, map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg], 2161 ((i == 0) && (!is_static)), 2162 &receiver_offset); 2163 break; 2164 case T_VOID: 2165 break; 2166 2167 case T_FLOAT: 2168 float_move(masm, in_regs[i], out_regs[c_arg]); 2169 break; 2170 2171 case T_DOUBLE: 2172 assert( i + 1 < total_in_args && 2173 in_sig_bt[i + 1] == T_VOID && 2174 out_sig_bt[c_arg+1] == T_VOID, "bad arg list"); 2175 double_move(masm, in_regs[i], out_regs[c_arg]); 2176 break; 2177 2178 case T_LONG : 2179 long_move(masm, in_regs[i], out_regs[c_arg]); 2180 break; 2181 2182 case T_ADDRESS: assert(false, "found T_ADDRESS in java args"); 2183 2184 default: 2185 move32_64(masm, in_regs[i], out_regs[c_arg]); 2186 } 2187 } 2188 2189 int c_arg; 2190 2191 // Pre-load a static method's oop into r14. Used both by locking code and 2192 // the normal JNI call code. 2193 if (!is_critical_native) { 2194 // point c_arg at the first arg that is already loaded in case we 2195 // need to spill before we call out 2196 c_arg = total_c_args - total_in_args; 2197 2198 if (method->is_static()) { 2199 2200 // load oop into a register 2201 __ movoop(oop_handle_reg, JNIHandles::make_local(method->method_holder()->java_mirror())); 2202 2203 // Now handlize the static class mirror it's known not-null. 2204 __ movptr(Address(rsp, klass_offset), oop_handle_reg); 2205 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset)); 2206 2207 // Now get the handle 2208 __ lea(oop_handle_reg, Address(rsp, klass_offset)); 2209 // store the klass handle as second argument 2210 __ movptr(c_rarg1, oop_handle_reg); 2211 // and protect the arg if we must spill 2212 c_arg--; 2213 } 2214 } else { 2215 // For JNI critical methods we need to save all registers in save_args. 2216 c_arg = 0; 2217 } 2218 2219 // Change state to native (we save the return address in the thread, since it might not 2220 // be pushed on the stack when we do a a stack traversal). It is enough that the pc() 2221 // points into the right code segment. It does not have to be the correct return pc. 2222 // We use the same pc/oopMap repeatedly when we call out 2223 2224 intptr_t the_pc = (intptr_t) __ pc(); 2225 oop_maps->add_gc_map(the_pc - start, map); 2226 2227 __ set_last_Java_frame(rsp, noreg, (address)the_pc); 2228 2229 2230 // We have all of the arguments setup at this point. We must not touch any register 2231 // argument registers at this point (what if we save/restore them there are no oop? 2232 2233 { 2234 SkipIfEqual skip(masm, &DTraceMethodProbes, false); 2235 // protect the args we've loaded 2236 save_args(masm, total_c_args, c_arg, out_regs); 2237 __ mov_metadata(c_rarg1, method()); 2238 __ call_VM_leaf( 2239 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), 2240 r15_thread, c_rarg1); 2241 restore_args(masm, total_c_args, c_arg, out_regs); 2242 } 2243 2244 // RedefineClasses() tracing support for obsolete method entry 2245 if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) { 2246 // protect the args we've loaded 2247 save_args(masm, total_c_args, c_arg, out_regs); 2248 __ mov_metadata(c_rarg1, method()); 2249 __ call_VM_leaf( 2250 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), 2251 r15_thread, c_rarg1); 2252 restore_args(masm, total_c_args, c_arg, out_regs); 2253 } 2254 2255 // Lock a synchronized method 2256 2257 // Register definitions used by locking and unlocking 2258 2259 const Register swap_reg = rax; // Must use rax for cmpxchg instruction 2260 const Register obj_reg = rbx; // Will contain the oop 2261 const Register lock_reg = r13; // Address of compiler lock object (BasicLock) 2262 const Register old_hdr = r13; // value of old header at unlock time 2263 2264 Label slow_path_lock; 2265 Label lock_done; 2266 2267 if (method->is_synchronized()) { 2268 assert(!is_critical_native, "unhandled"); 2269 2270 2271 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes(); 2272 2273 // Get the handle (the 2nd argument) 2274 __ mov(oop_handle_reg, c_rarg1); 2275 2276 // Get address of the box 2277 2278 __ lea(lock_reg, Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size)); 2279 2280 // Load the oop from the handle 2281 __ movptr(obj_reg, Address(oop_handle_reg, 0)); 2282 2283 if (UseBiasedLocking) { 2284 __ biased_locking_enter(lock_reg, obj_reg, swap_reg, rscratch1, false, lock_done, &slow_path_lock); 2285 } 2286 2287 // Load immediate 1 into swap_reg %rax 2288 __ movl(swap_reg, 1); 2289 2290 // Load (object->mark() | 1) into swap_reg %rax 2291 __ orptr(swap_reg, Address(obj_reg, 0)); 2292 2293 // Save (object->mark() | 1) into BasicLock's displaced header 2294 __ movptr(Address(lock_reg, mark_word_offset), swap_reg); 2295 2296 if (os::is_MP()) { 2297 __ lock(); 2298 } 2299 2300 // src -> dest iff dest == rax else rax <- dest 2301 __ cmpxchgptr(lock_reg, Address(obj_reg, 0)); 2302 __ jcc(Assembler::equal, lock_done); 2303 2304 // Hmm should this move to the slow path code area??? 2305 2306 // Test if the oopMark is an obvious stack pointer, i.e., 2307 // 1) (mark & 3) == 0, and 2308 // 2) rsp <= mark < mark + os::pagesize() 2309 // These 3 tests can be done by evaluating the following 2310 // expression: ((mark - rsp) & (3 - os::vm_page_size())), 2311 // assuming both stack pointer and pagesize have their 2312 // least significant 2 bits clear. 2313 // NOTE: the oopMark is in swap_reg %rax as the result of cmpxchg 2314 2315 __ subptr(swap_reg, rsp); 2316 __ andptr(swap_reg, 3 - os::vm_page_size()); 2317 2318 // Save the test result, for recursive case, the result is zero 2319 __ movptr(Address(lock_reg, mark_word_offset), swap_reg); 2320 __ jcc(Assembler::notEqual, slow_path_lock); 2321 2322 // Slow path will re-enter here 2323 2324 __ bind(lock_done); 2325 } 2326 2327 2328 // Finally just about ready to make the JNI call 2329 2330 2331 // get JNIEnv* which is first argument to native 2332 if (!is_critical_native) { 2333 __ lea(c_rarg0, Address(r15_thread, in_bytes(JavaThread::jni_environment_offset()))); 2334 } 2335 2336 // Now set thread in native 2337 __ movl(Address(r15_thread, JavaThread::thread_state_offset()), _thread_in_native); 2338 2339 __ call(RuntimeAddress(native_func)); 2340 2341 // Verify or restore cpu control state after JNI call 2342 __ restore_cpu_control_state_after_jni(); 2343 2344 // Unpack native results. 2345 switch (ret_type) { 2346 case T_BOOLEAN: __ c2bool(rax); break; 2347 case T_CHAR : __ movzwl(rax, rax); break; 2348 case T_BYTE : __ sign_extend_byte (rax); break; 2349 case T_SHORT : __ sign_extend_short(rax); break; 2350 case T_INT : /* nothing to do */ break; 2351 case T_DOUBLE : 2352 case T_FLOAT : 2353 // Result is in xmm0 we'll save as needed 2354 break; 2355 case T_ARRAY: // Really a handle 2356 case T_OBJECT: // Really a handle 2357 break; // can't de-handlize until after safepoint check 2358 case T_VOID: break; 2359 case T_LONG: break; 2360 default : ShouldNotReachHere(); 2361 } 2362 2363 // Switch thread to "native transition" state before reading the synchronization state. 2364 // This additional state is necessary because reading and testing the synchronization 2365 // state is not atomic w.r.t. GC, as this scenario demonstrates: 2366 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted. 2367 // VM thread changes sync state to synchronizing and suspends threads for GC. 2368 // Thread A is resumed to finish this native method, but doesn't block here since it 2369 // didn't see any synchronization is progress, and escapes. 2370 __ movl(Address(r15_thread, JavaThread::thread_state_offset()), _thread_in_native_trans); 2371 2372 if(os::is_MP()) { 2373 if (UseMembar) { 2374 // Force this write out before the read below 2375 __ membar(Assembler::Membar_mask_bits( 2376 Assembler::LoadLoad | Assembler::LoadStore | 2377 Assembler::StoreLoad | Assembler::StoreStore)); 2378 } else { 2379 // Write serialization page so VM thread can do a pseudo remote membar. 2380 // We use the current thread pointer to calculate a thread specific 2381 // offset to write to within the page. This minimizes bus traffic 2382 // due to cache line collision. 2383 __ serialize_memory(r15_thread, rcx); 2384 } 2385 } 2386 2387 Label after_transition; 2388 2389 // check for safepoint operation in progress and/or pending suspend requests 2390 { 2391 Label Continue; 2392 2393 __ cmp32(ExternalAddress((address)SafepointSynchronize::address_of_state()), 2394 SafepointSynchronize::_not_synchronized); 2395 2396 Label L; 2397 __ jcc(Assembler::notEqual, L); 2398 __ cmpl(Address(r15_thread, JavaThread::suspend_flags_offset()), 0); 2399 __ jcc(Assembler::equal, Continue); 2400 __ bind(L); 2401 2402 // Don't use call_VM as it will see a possible pending exception and forward it 2403 // and never return here preventing us from clearing _last_native_pc down below. 2404 // Also can't use call_VM_leaf either as it will check to see if rsi & rdi are 2405 // preserved and correspond to the bcp/locals pointers. So we do a runtime call 2406 // by hand. 2407 // 2408 save_native_result(masm, ret_type, stack_slots); 2409 __ mov(c_rarg0, r15_thread); 2410 __ mov(r12, rsp); // remember sp 2411 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows 2412 __ andptr(rsp, -16); // align stack as required by ABI 2413 if (!is_critical_native) { 2414 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans))); 2415 } else { 2416 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans_and_transition))); 2417 } 2418 __ mov(rsp, r12); // restore sp 2419 __ reinit_heapbase(); 2420 // Restore any method result value 2421 restore_native_result(masm, ret_type, stack_slots); 2422 2423 if (is_critical_native) { 2424 // The call above performed the transition to thread_in_Java so 2425 // skip the transition logic below. 2426 __ jmpb(after_transition); 2427 } 2428 2429 __ bind(Continue); 2430 } 2431 2432 // change thread state 2433 __ movl(Address(r15_thread, JavaThread::thread_state_offset()), _thread_in_Java); 2434 __ bind(after_transition); 2435 2436 Label reguard; 2437 Label reguard_done; 2438 __ cmpl(Address(r15_thread, JavaThread::stack_guard_state_offset()), JavaThread::stack_guard_yellow_disabled); 2439 __ jcc(Assembler::equal, reguard); 2440 __ bind(reguard_done); 2441 2442 // native result if any is live 2443 2444 // Unlock 2445 Label unlock_done; 2446 Label slow_path_unlock; 2447 if (method->is_synchronized()) { 2448 2449 // Get locked oop from the handle we passed to jni 2450 __ movptr(obj_reg, Address(oop_handle_reg, 0)); 2451 2452 Label done; 2453 2454 if (UseBiasedLocking) { 2455 __ biased_locking_exit(obj_reg, old_hdr, done); 2456 } 2457 2458 // Simple recursive lock? 2459 2460 __ cmpptr(Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size), (int32_t)NULL_WORD); 2461 __ jcc(Assembler::equal, done); 2462 2463 // Must save rax if if it is live now because cmpxchg must use it 2464 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { 2465 save_native_result(masm, ret_type, stack_slots); 2466 } 2467 2468 2469 // get address of the stack lock 2470 __ lea(rax, Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size)); 2471 // get old displaced header 2472 __ movptr(old_hdr, Address(rax, 0)); 2473 2474 // Atomic swap old header if oop still contains the stack lock 2475 if (os::is_MP()) { 2476 __ lock(); 2477 } 2478 __ cmpxchgptr(old_hdr, Address(obj_reg, 0)); 2479 __ jcc(Assembler::notEqual, slow_path_unlock); 2480 2481 // slow path re-enters here 2482 __ bind(unlock_done); 2483 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { 2484 restore_native_result(masm, ret_type, stack_slots); 2485 } 2486 2487 __ bind(done); 2488 2489 } 2490 { 2491 SkipIfEqual skip(masm, &DTraceMethodProbes, false); 2492 save_native_result(masm, ret_type, stack_slots); 2493 __ mov_metadata(c_rarg1, method()); 2494 __ call_VM_leaf( 2495 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), 2496 r15_thread, c_rarg1); 2497 restore_native_result(masm, ret_type, stack_slots); 2498 } 2499 2500 __ reset_last_Java_frame(false, true); 2501 2502 // Unpack oop result 2503 if (ret_type == T_OBJECT || ret_type == T_ARRAY) { 2504 Label L; 2505 __ testptr(rax, rax); 2506 __ jcc(Assembler::zero, L); 2507 __ movptr(rax, Address(rax, 0)); 2508 __ bind(L); 2509 __ verify_oop(rax); 2510 } 2511 2512 if (!is_critical_native) { 2513 // reset handle block 2514 __ movptr(rcx, Address(r15_thread, JavaThread::active_handles_offset())); 2515 __ movl(Address(rcx, JNIHandleBlock::top_offset_in_bytes()), (int32_t)NULL_WORD); 2516 } 2517 2518 // pop our frame 2519 2520 __ leave(); 2521 2522 if (!is_critical_native) { 2523 // Any exception pending? 2524 __ cmpptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int32_t)NULL_WORD); 2525 __ jcc(Assembler::notEqual, exception_pending); 2526 } 2527 2528 // Return 2529 2530 __ ret(0); 2531 2532 // Unexpected paths are out of line and go here 2533 2534 if (!is_critical_native) { 2535 // forward the exception 2536 __ bind(exception_pending); 2537 2538 // and forward the exception 2539 __ jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 2540 } 2541 2542 // Slow path locking & unlocking 2543 if (method->is_synchronized()) { 2544 2545 // BEGIN Slow path lock 2546 __ bind(slow_path_lock); 2547 2548 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM 2549 // args are (oop obj, BasicLock* lock, JavaThread* thread) 2550 2551 // protect the args we've loaded 2552 save_args(masm, total_c_args, c_arg, out_regs); 2553 2554 __ mov(c_rarg0, obj_reg); 2555 __ mov(c_rarg1, lock_reg); 2556 __ mov(c_rarg2, r15_thread); 2557 2558 // Not a leaf but we have last_Java_frame setup as we want 2559 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3); 2560 restore_args(masm, total_c_args, c_arg, out_regs); 2561 2562 #ifdef ASSERT 2563 { Label L; 2564 __ cmpptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int32_t)NULL_WORD); 2565 __ jcc(Assembler::equal, L); 2566 __ stop("no pending exception allowed on exit from monitorenter"); 2567 __ bind(L); 2568 } 2569 #endif 2570 __ jmp(lock_done); 2571 2572 // END Slow path lock 2573 2574 // BEGIN Slow path unlock 2575 __ bind(slow_path_unlock); 2576 2577 // If we haven't already saved the native result we must save it now as xmm registers 2578 // are still exposed. 2579 2580 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { 2581 save_native_result(masm, ret_type, stack_slots); 2582 } 2583 2584 __ lea(c_rarg1, Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size)); 2585 2586 __ mov(c_rarg0, obj_reg); 2587 __ mov(r12, rsp); // remember sp 2588 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows 2589 __ andptr(rsp, -16); // align stack as required by ABI 2590 2591 // Save pending exception around call to VM (which contains an EXCEPTION_MARK) 2592 // NOTE that obj_reg == rbx currently 2593 __ movptr(rbx, Address(r15_thread, in_bytes(Thread::pending_exception_offset()))); 2594 __ movptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int32_t)NULL_WORD); 2595 2596 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C))); 2597 __ mov(rsp, r12); // restore sp 2598 __ reinit_heapbase(); 2599 #ifdef ASSERT 2600 { 2601 Label L; 2602 __ cmpptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int)NULL_WORD); 2603 __ jcc(Assembler::equal, L); 2604 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C"); 2605 __ bind(L); 2606 } 2607 #endif /* ASSERT */ 2608 2609 __ movptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), rbx); 2610 2611 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { 2612 restore_native_result(masm, ret_type, stack_slots); 2613 } 2614 __ jmp(unlock_done); 2615 2616 // END Slow path unlock 2617 2618 } // synchronized 2619 2620 // SLOW PATH Reguard the stack if needed 2621 2622 __ bind(reguard); 2623 save_native_result(masm, ret_type, stack_slots); 2624 __ mov(r12, rsp); // remember sp 2625 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows 2626 __ andptr(rsp, -16); // align stack as required by ABI 2627 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages))); 2628 __ mov(rsp, r12); // restore sp 2629 __ reinit_heapbase(); 2630 restore_native_result(masm, ret_type, stack_slots); 2631 // and continue 2632 __ jmp(reguard_done); 2633 2634 2635 2636 __ flush(); 2637 2638 nmethod *nm = nmethod::new_native_nmethod(method, 2639 compile_id, 2640 masm->code(), 2641 vep_offset, 2642 frame_complete, 2643 stack_slots / VMRegImpl::slots_per_word, 2644 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)), 2645 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size), 2646 oop_maps); 2647 2648 if (is_critical_native) { 2649 nm->set_lazy_critical_native(true); 2650 } 2651 2652 return nm; 2653 2654 } 2655 2656 #ifdef HAVE_DTRACE_H 2657 // --------------------------------------------------------------------------- 2658 // Generate a dtrace nmethod for a given signature. The method takes arguments 2659 // in the Java compiled code convention, marshals them to the native 2660 // abi and then leaves nops at the position you would expect to call a native 2661 // function. When the probe is enabled the nops are replaced with a trap 2662 // instruction that dtrace inserts and the trace will cause a notification 2663 // to dtrace. 2664 // 2665 // The probes are only able to take primitive types and java/lang/String as 2666 // arguments. No other java types are allowed. Strings are converted to utf8 2667 // strings so that from dtrace point of view java strings are converted to C 2668 // strings. There is an arbitrary fixed limit on the total space that a method 2669 // can use for converting the strings. (256 chars per string in the signature). 2670 // So any java string larger then this is truncated. 2671 2672 static int fp_offset[ConcreteRegisterImpl::number_of_registers] = { 0 }; 2673 static bool offsets_initialized = false; 2674 2675 2676 nmethod *SharedRuntime::generate_dtrace_nmethod(MacroAssembler *masm, 2677 methodHandle method) { 2678 2679 2680 // generate_dtrace_nmethod is guarded by a mutex so we are sure to 2681 // be single threaded in this method. 2682 assert(AdapterHandlerLibrary_lock->owned_by_self(), "must be"); 2683 2684 if (!offsets_initialized) { 2685 fp_offset[c_rarg0->as_VMReg()->value()] = -1 * wordSize; 2686 fp_offset[c_rarg1->as_VMReg()->value()] = -2 * wordSize; 2687 fp_offset[c_rarg2->as_VMReg()->value()] = -3 * wordSize; 2688 fp_offset[c_rarg3->as_VMReg()->value()] = -4 * wordSize; 2689 fp_offset[c_rarg4->as_VMReg()->value()] = -5 * wordSize; 2690 fp_offset[c_rarg5->as_VMReg()->value()] = -6 * wordSize; 2691 2692 fp_offset[c_farg0->as_VMReg()->value()] = -7 * wordSize; 2693 fp_offset[c_farg1->as_VMReg()->value()] = -8 * wordSize; 2694 fp_offset[c_farg2->as_VMReg()->value()] = -9 * wordSize; 2695 fp_offset[c_farg3->as_VMReg()->value()] = -10 * wordSize; 2696 fp_offset[c_farg4->as_VMReg()->value()] = -11 * wordSize; 2697 fp_offset[c_farg5->as_VMReg()->value()] = -12 * wordSize; 2698 fp_offset[c_farg6->as_VMReg()->value()] = -13 * wordSize; 2699 fp_offset[c_farg7->as_VMReg()->value()] = -14 * wordSize; 2700 2701 offsets_initialized = true; 2702 } 2703 // Fill in the signature array, for the calling-convention call. 2704 int total_args_passed = method->size_of_parameters(); 2705 2706 BasicType* in_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed); 2707 VMRegPair *in_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed); 2708 2709 // The signature we are going to use for the trap that dtrace will see 2710 // java/lang/String is converted. We drop "this" and any other object 2711 // is converted to NULL. (A one-slot java/lang/Long object reference 2712 // is converted to a two-slot long, which is why we double the allocation). 2713 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed * 2); 2714 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed * 2); 2715 2716 int i=0; 2717 int total_strings = 0; 2718 int first_arg_to_pass = 0; 2719 int total_c_args = 0; 2720 2721 // Skip the receiver as dtrace doesn't want to see it 2722 if( !method->is_static() ) { 2723 in_sig_bt[i++] = T_OBJECT; 2724 first_arg_to_pass = 1; 2725 } 2726 2727 // We need to convert the java args to where a native (non-jni) function 2728 // would expect them. To figure out where they go we convert the java 2729 // signature to a C signature. 2730 2731 SignatureStream ss(method->signature()); 2732 for ( ; !ss.at_return_type(); ss.next()) { 2733 BasicType bt = ss.type(); 2734 in_sig_bt[i++] = bt; // Collect remaining bits of signature 2735 out_sig_bt[total_c_args++] = bt; 2736 if( bt == T_OBJECT) { 2737 Symbol* s = ss.as_symbol_or_null(); // symbol is created 2738 if (s == vmSymbols::java_lang_String()) { 2739 total_strings++; 2740 out_sig_bt[total_c_args-1] = T_ADDRESS; 2741 } else if (s == vmSymbols::java_lang_Boolean() || 2742 s == vmSymbols::java_lang_Character() || 2743 s == vmSymbols::java_lang_Byte() || 2744 s == vmSymbols::java_lang_Short() || 2745 s == vmSymbols::java_lang_Integer() || 2746 s == vmSymbols::java_lang_Float()) { 2747 out_sig_bt[total_c_args-1] = T_INT; 2748 } else if (s == vmSymbols::java_lang_Long() || 2749 s == vmSymbols::java_lang_Double()) { 2750 out_sig_bt[total_c_args-1] = T_LONG; 2751 out_sig_bt[total_c_args++] = T_VOID; 2752 } 2753 } else if ( bt == T_LONG || bt == T_DOUBLE ) { 2754 in_sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots 2755 // We convert double to long 2756 out_sig_bt[total_c_args-1] = T_LONG; 2757 out_sig_bt[total_c_args++] = T_VOID; 2758 } else if ( bt == T_FLOAT) { 2759 // We convert float to int 2760 out_sig_bt[total_c_args-1] = T_INT; 2761 } 2762 } 2763 2764 assert(i==total_args_passed, "validly parsed signature"); 2765 2766 // Now get the compiled-Java layout as input arguments 2767 int comp_args_on_stack; 2768 comp_args_on_stack = SharedRuntime::java_calling_convention( 2769 in_sig_bt, in_regs, total_args_passed, false); 2770 2771 // Now figure out where the args must be stored and how much stack space 2772 // they require (neglecting out_preserve_stack_slots but space for storing 2773 // the 1st six register arguments). It's weird see int_stk_helper. 2774 2775 int out_arg_slots; 2776 out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args); 2777 2778 // Calculate the total number of stack slots we will need. 2779 2780 // First count the abi requirement plus all of the outgoing args 2781 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots; 2782 2783 // Now space for the string(s) we must convert 2784 int* string_locs = NEW_RESOURCE_ARRAY(int, total_strings + 1); 2785 for (i = 0; i < total_strings ; i++) { 2786 string_locs[i] = stack_slots; 2787 stack_slots += max_dtrace_string_size / VMRegImpl::stack_slot_size; 2788 } 2789 2790 // Plus the temps we might need to juggle register args 2791 // regs take two slots each 2792 stack_slots += (Argument::n_int_register_parameters_c + 2793 Argument::n_float_register_parameters_c) * 2; 2794 2795 2796 // + 4 for return address (which we own) and saved rbp, 2797 2798 stack_slots += 4; 2799 2800 // Ok The space we have allocated will look like: 2801 // 2802 // 2803 // FP-> | | 2804 // |---------------------| 2805 // | string[n] | 2806 // |---------------------| <- string_locs[n] 2807 // | string[n-1] | 2808 // |---------------------| <- string_locs[n-1] 2809 // | ... | 2810 // | ... | 2811 // |---------------------| <- string_locs[1] 2812 // | string[0] | 2813 // |---------------------| <- string_locs[0] 2814 // | outbound memory | 2815 // | based arguments | 2816 // | | 2817 // |---------------------| 2818 // | | 2819 // SP-> | out_preserved_slots | 2820 // 2821 // 2822 2823 // Now compute actual number of stack words we need rounding to make 2824 // stack properly aligned. 2825 stack_slots = round_to(stack_slots, 4 * VMRegImpl::slots_per_word); 2826 2827 int stack_size = stack_slots * VMRegImpl::stack_slot_size; 2828 2829 intptr_t start = (intptr_t)__ pc(); 2830 2831 // First thing make an ic check to see if we should even be here 2832 2833 // We are free to use all registers as temps without saving them and 2834 // restoring them except rbp. rbp, is the only callee save register 2835 // as far as the interpreter and the compiler(s) are concerned. 2836 2837 const Register ic_reg = rax; 2838 const Register receiver = rcx; 2839 Label hit; 2840 Label exception_pending; 2841 2842 2843 __ verify_oop(receiver); 2844 __ cmpl(ic_reg, Address(receiver, oopDesc::klass_offset_in_bytes())); 2845 __ jcc(Assembler::equal, hit); 2846 2847 __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); 2848 2849 // verified entry must be aligned for code patching. 2850 // and the first 5 bytes must be in the same cache line 2851 // if we align at 8 then we will be sure 5 bytes are in the same line 2852 __ align(8); 2853 2854 __ bind(hit); 2855 2856 int vep_offset = ((intptr_t)__ pc()) - start; 2857 2858 2859 // The instruction at the verified entry point must be 5 bytes or longer 2860 // because it can be patched on the fly by make_non_entrant. The stack bang 2861 // instruction fits that requirement. 2862 2863 // Generate stack overflow check 2864 2865 if (UseStackBanging) { 2866 if (stack_size <= StackShadowPages*os::vm_page_size()) { 2867 __ bang_stack_with_offset(StackShadowPages*os::vm_page_size()); 2868 } else { 2869 __ movl(rax, stack_size); 2870 __ bang_stack_size(rax, rbx); 2871 } 2872 } else { 2873 // need a 5 byte instruction to allow MT safe patching to non-entrant 2874 __ fat_nop(); 2875 } 2876 2877 assert(((uintptr_t)__ pc() - start - vep_offset) >= 5, 2878 "valid size for make_non_entrant"); 2879 2880 // Generate a new frame for the wrapper. 2881 __ enter(); 2882 2883 // -4 because return address is already present and so is saved rbp, 2884 if (stack_size - 2*wordSize != 0) { 2885 __ subq(rsp, stack_size - 2*wordSize); 2886 } 2887 2888 // Frame is now completed as far a size and linkage. 2889 2890 int frame_complete = ((intptr_t)__ pc()) - start; 2891 2892 int c_arg, j_arg; 2893 2894 // State of input register args 2895 2896 bool live[ConcreteRegisterImpl::number_of_registers]; 2897 2898 live[j_rarg0->as_VMReg()->value()] = false; 2899 live[j_rarg1->as_VMReg()->value()] = false; 2900 live[j_rarg2->as_VMReg()->value()] = false; 2901 live[j_rarg3->as_VMReg()->value()] = false; 2902 live[j_rarg4->as_VMReg()->value()] = false; 2903 live[j_rarg5->as_VMReg()->value()] = false; 2904 2905 live[j_farg0->as_VMReg()->value()] = false; 2906 live[j_farg1->as_VMReg()->value()] = false; 2907 live[j_farg2->as_VMReg()->value()] = false; 2908 live[j_farg3->as_VMReg()->value()] = false; 2909 live[j_farg4->as_VMReg()->value()] = false; 2910 live[j_farg5->as_VMReg()->value()] = false; 2911 live[j_farg6->as_VMReg()->value()] = false; 2912 live[j_farg7->as_VMReg()->value()] = false; 2913 2914 2915 bool rax_is_zero = false; 2916 2917 // All args (except strings) destined for the stack are moved first 2918 for (j_arg = first_arg_to_pass, c_arg = 0 ; 2919 j_arg < total_args_passed ; j_arg++, c_arg++ ) { 2920 VMRegPair src = in_regs[j_arg]; 2921 VMRegPair dst = out_regs[c_arg]; 2922 2923 // Get the real reg value or a dummy (rsp) 2924 2925 int src_reg = src.first()->is_reg() ? 2926 src.first()->value() : 2927 rsp->as_VMReg()->value(); 2928 2929 bool useless = in_sig_bt[j_arg] == T_ARRAY || 2930 (in_sig_bt[j_arg] == T_OBJECT && 2931 out_sig_bt[c_arg] != T_INT && 2932 out_sig_bt[c_arg] != T_ADDRESS && 2933 out_sig_bt[c_arg] != T_LONG); 2934 2935 live[src_reg] = !useless; 2936 2937 if (dst.first()->is_stack()) { 2938 2939 // Even though a string arg in a register is still live after this loop 2940 // after the string conversion loop (next) it will be dead so we take 2941 // advantage of that now for simpler code to manage live. 2942 2943 live[src_reg] = false; 2944 switch (in_sig_bt[j_arg]) { 2945 2946 case T_ARRAY: 2947 case T_OBJECT: 2948 { 2949 Address stack_dst(rsp, reg2offset_out(dst.first())); 2950 2951 if (out_sig_bt[c_arg] == T_INT || out_sig_bt[c_arg] == T_LONG) { 2952 // need to unbox a one-word value 2953 Register in_reg = rax; 2954 if ( src.first()->is_reg() ) { 2955 in_reg = src.first()->as_Register(); 2956 } else { 2957 __ movq(rax, Address(rbp, reg2offset_in(src.first()))); 2958 rax_is_zero = false; 2959 } 2960 Label skipUnbox; 2961 __ movptr(Address(rsp, reg2offset_out(dst.first())), 2962 (int32_t)NULL_WORD); 2963 __ testq(in_reg, in_reg); 2964 __ jcc(Assembler::zero, skipUnbox); 2965 2966 BasicType bt = out_sig_bt[c_arg]; 2967 int box_offset = java_lang_boxing_object::value_offset_in_bytes(bt); 2968 Address src1(in_reg, box_offset); 2969 if ( bt == T_LONG ) { 2970 __ movq(in_reg, src1); 2971 __ movq(stack_dst, in_reg); 2972 assert(out_sig_bt[c_arg+1] == T_VOID, "must be"); 2973 ++c_arg; // skip over T_VOID to keep the loop indices in sync 2974 } else { 2975 __ movl(in_reg, src1); 2976 __ movl(stack_dst, in_reg); 2977 } 2978 2979 __ bind(skipUnbox); 2980 } else if (out_sig_bt[c_arg] != T_ADDRESS) { 2981 // Convert the arg to NULL 2982 if (!rax_is_zero) { 2983 __ xorq(rax, rax); 2984 rax_is_zero = true; 2985 } 2986 __ movq(stack_dst, rax); 2987 } 2988 } 2989 break; 2990 2991 case T_VOID: 2992 break; 2993 2994 case T_FLOAT: 2995 // This does the right thing since we know it is destined for the 2996 // stack 2997 float_move(masm, src, dst); 2998 break; 2999 3000 case T_DOUBLE: 3001 // This does the right thing since we know it is destined for the 3002 // stack 3003 double_move(masm, src, dst); 3004 break; 3005 3006 case T_LONG : 3007 long_move(masm, src, dst); 3008 break; 3009 3010 case T_ADDRESS: assert(false, "found T_ADDRESS in java args"); 3011 3012 default: 3013 move32_64(masm, src, dst); 3014 } 3015 } 3016 3017 } 3018 3019 // If we have any strings we must store any register based arg to the stack 3020 // This includes any still live xmm registers too. 3021 3022 int sid = 0; 3023 3024 if (total_strings > 0 ) { 3025 for (j_arg = first_arg_to_pass, c_arg = 0 ; 3026 j_arg < total_args_passed ; j_arg++, c_arg++ ) { 3027 VMRegPair src = in_regs[j_arg]; 3028 VMRegPair dst = out_regs[c_arg]; 3029 3030 if (src.first()->is_reg()) { 3031 Address src_tmp(rbp, fp_offset[src.first()->value()]); 3032 3033 // string oops were left untouched by the previous loop even if the 3034 // eventual (converted) arg is destined for the stack so park them 3035 // away now (except for first) 3036 3037 if (out_sig_bt[c_arg] == T_ADDRESS) { 3038 Address utf8_addr = Address( 3039 rsp, string_locs[sid++] * VMRegImpl::stack_slot_size); 3040 if (sid != 1) { 3041 // The first string arg won't be killed until after the utf8 3042 // conversion 3043 __ movq(utf8_addr, src.first()->as_Register()); 3044 } 3045 } else if (dst.first()->is_reg()) { 3046 if (in_sig_bt[j_arg] == T_FLOAT || in_sig_bt[j_arg] == T_DOUBLE) { 3047 3048 // Convert the xmm register to an int and store it in the reserved 3049 // location for the eventual c register arg 3050 XMMRegister f = src.first()->as_XMMRegister(); 3051 if (in_sig_bt[j_arg] == T_FLOAT) { 3052 __ movflt(src_tmp, f); 3053 } else { 3054 __ movdbl(src_tmp, f); 3055 } 3056 } else { 3057 // If the arg is an oop type we don't support don't bother to store 3058 // it remember string was handled above. 3059 bool useless = in_sig_bt[j_arg] == T_ARRAY || 3060 (in_sig_bt[j_arg] == T_OBJECT && 3061 out_sig_bt[c_arg] != T_INT && 3062 out_sig_bt[c_arg] != T_LONG); 3063 3064 if (!useless) { 3065 __ movq(src_tmp, src.first()->as_Register()); 3066 } 3067 } 3068 } 3069 } 3070 if (in_sig_bt[j_arg] == T_OBJECT && out_sig_bt[c_arg] == T_LONG) { 3071 assert(out_sig_bt[c_arg+1] == T_VOID, "must be"); 3072 ++c_arg; // skip over T_VOID to keep the loop indices in sync 3073 } 3074 } 3075 3076 // Now that the volatile registers are safe, convert all the strings 3077 sid = 0; 3078 3079 for (j_arg = first_arg_to_pass, c_arg = 0 ; 3080 j_arg < total_args_passed ; j_arg++, c_arg++ ) { 3081 if (out_sig_bt[c_arg] == T_ADDRESS) { 3082 // It's a string 3083 Address utf8_addr = Address( 3084 rsp, string_locs[sid++] * VMRegImpl::stack_slot_size); 3085 // The first string we find might still be in the original java arg 3086 // register 3087 3088 VMReg src = in_regs[j_arg].first(); 3089 3090 // We will need to eventually save the final argument to the trap 3091 // in the von-volatile location dedicated to src. This is the offset 3092 // from fp we will use. 3093 int src_off = src->is_reg() ? 3094 fp_offset[src->value()] : reg2offset_in(src); 3095 3096 // This is where the argument will eventually reside 3097 VMRegPair dst = out_regs[c_arg]; 3098 3099 if (src->is_reg()) { 3100 if (sid == 1) { 3101 __ movq(c_rarg0, src->as_Register()); 3102 } else { 3103 __ movq(c_rarg0, utf8_addr); 3104 } 3105 } else { 3106 // arg is still in the original location 3107 __ movq(c_rarg0, Address(rbp, reg2offset_in(src))); 3108 } 3109 Label done, convert; 3110 3111 // see if the oop is NULL 3112 __ testq(c_rarg0, c_rarg0); 3113 __ jcc(Assembler::notEqual, convert); 3114 3115 if (dst.first()->is_reg()) { 3116 // Save the ptr to utf string in the origina src loc or the tmp 3117 // dedicated to it 3118 __ movq(Address(rbp, src_off), c_rarg0); 3119 } else { 3120 __ movq(Address(rsp, reg2offset_out(dst.first())), c_rarg0); 3121 } 3122 __ jmp(done); 3123 3124 __ bind(convert); 3125 3126 __ lea(c_rarg1, utf8_addr); 3127 if (dst.first()->is_reg()) { 3128 __ movq(Address(rbp, src_off), c_rarg1); 3129 } else { 3130 __ movq(Address(rsp, reg2offset_out(dst.first())), c_rarg1); 3131 } 3132 // And do the conversion 3133 __ call(RuntimeAddress( 3134 CAST_FROM_FN_PTR(address, SharedRuntime::get_utf))); 3135 3136 __ bind(done); 3137 } 3138 if (in_sig_bt[j_arg] == T_OBJECT && out_sig_bt[c_arg] == T_LONG) { 3139 assert(out_sig_bt[c_arg+1] == T_VOID, "must be"); 3140 ++c_arg; // skip over T_VOID to keep the loop indices in sync 3141 } 3142 } 3143 // The get_utf call killed all the c_arg registers 3144 live[c_rarg0->as_VMReg()->value()] = false; 3145 live[c_rarg1->as_VMReg()->value()] = false; 3146 live[c_rarg2->as_VMReg()->value()] = false; 3147 live[c_rarg3->as_VMReg()->value()] = false; 3148 live[c_rarg4->as_VMReg()->value()] = false; 3149 live[c_rarg5->as_VMReg()->value()] = false; 3150 3151 live[c_farg0->as_VMReg()->value()] = false; 3152 live[c_farg1->as_VMReg()->value()] = false; 3153 live[c_farg2->as_VMReg()->value()] = false; 3154 live[c_farg3->as_VMReg()->value()] = false; 3155 live[c_farg4->as_VMReg()->value()] = false; 3156 live[c_farg5->as_VMReg()->value()] = false; 3157 live[c_farg6->as_VMReg()->value()] = false; 3158 live[c_farg7->as_VMReg()->value()] = false; 3159 } 3160 3161 // Now we can finally move the register args to their desired locations 3162 3163 rax_is_zero = false; 3164 3165 for (j_arg = first_arg_to_pass, c_arg = 0 ; 3166 j_arg < total_args_passed ; j_arg++, c_arg++ ) { 3167 3168 VMRegPair src = in_regs[j_arg]; 3169 VMRegPair dst = out_regs[c_arg]; 3170 3171 // Only need to look for args destined for the interger registers (since we 3172 // convert float/double args to look like int/long outbound) 3173 if (dst.first()->is_reg()) { 3174 Register r = dst.first()->as_Register(); 3175 3176 // Check if the java arg is unsupported and thereofre useless 3177 bool useless = in_sig_bt[j_arg] == T_ARRAY || 3178 (in_sig_bt[j_arg] == T_OBJECT && 3179 out_sig_bt[c_arg] != T_INT && 3180 out_sig_bt[c_arg] != T_ADDRESS && 3181 out_sig_bt[c_arg] != T_LONG); 3182 3183 3184 // If we're going to kill an existing arg save it first 3185 if (live[dst.first()->value()]) { 3186 // you can't kill yourself 3187 if (src.first() != dst.first()) { 3188 __ movq(Address(rbp, fp_offset[dst.first()->value()]), r); 3189 } 3190 } 3191 if (src.first()->is_reg()) { 3192 if (live[src.first()->value()] ) { 3193 if (in_sig_bt[j_arg] == T_FLOAT) { 3194 __ movdl(r, src.first()->as_XMMRegister()); 3195 } else if (in_sig_bt[j_arg] == T_DOUBLE) { 3196 __ movdq(r, src.first()->as_XMMRegister()); 3197 } else if (r != src.first()->as_Register()) { 3198 if (!useless) { 3199 __ movq(r, src.first()->as_Register()); 3200 } 3201 } 3202 } else { 3203 // If the arg is an oop type we don't support don't bother to store 3204 // it 3205 if (!useless) { 3206 if (in_sig_bt[j_arg] == T_DOUBLE || 3207 in_sig_bt[j_arg] == T_LONG || 3208 in_sig_bt[j_arg] == T_OBJECT ) { 3209 __ movq(r, Address(rbp, fp_offset[src.first()->value()])); 3210 } else { 3211 __ movl(r, Address(rbp, fp_offset[src.first()->value()])); 3212 } 3213 } 3214 } 3215 live[src.first()->value()] = false; 3216 } else if (!useless) { 3217 // full sized move even for int should be ok 3218 __ movq(r, Address(rbp, reg2offset_in(src.first()))); 3219 } 3220 3221 // At this point r has the original java arg in the final location 3222 // (assuming it wasn't useless). If the java arg was an oop 3223 // we have a bit more to do 3224 3225 if (in_sig_bt[j_arg] == T_ARRAY || in_sig_bt[j_arg] == T_OBJECT ) { 3226 if (out_sig_bt[c_arg] == T_INT || out_sig_bt[c_arg] == T_LONG) { 3227 // need to unbox a one-word value 3228 Label skip; 3229 __ testq(r, r); 3230 __ jcc(Assembler::equal, skip); 3231 BasicType bt = out_sig_bt[c_arg]; 3232 int box_offset = java_lang_boxing_object::value_offset_in_bytes(bt); 3233 Address src1(r, box_offset); 3234 if ( bt == T_LONG ) { 3235 __ movq(r, src1); 3236 } else { 3237 __ movl(r, src1); 3238 } 3239 __ bind(skip); 3240 3241 } else if (out_sig_bt[c_arg] != T_ADDRESS) { 3242 // Convert the arg to NULL 3243 __ xorq(r, r); 3244 } 3245 } 3246 3247 // dst can longer be holding an input value 3248 live[dst.first()->value()] = false; 3249 } 3250 if (in_sig_bt[j_arg] == T_OBJECT && out_sig_bt[c_arg] == T_LONG) { 3251 assert(out_sig_bt[c_arg+1] == T_VOID, "must be"); 3252 ++c_arg; // skip over T_VOID to keep the loop indices in sync 3253 } 3254 } 3255 3256 3257 // Ok now we are done. Need to place the nop that dtrace wants in order to 3258 // patch in the trap 3259 int patch_offset = ((intptr_t)__ pc()) - start; 3260 3261 __ nop(); 3262 3263 3264 // Return 3265 3266 __ leave(); 3267 __ ret(0); 3268 3269 __ flush(); 3270 3271 nmethod *nm = nmethod::new_dtrace_nmethod( 3272 method, masm->code(), vep_offset, patch_offset, frame_complete, 3273 stack_slots / VMRegImpl::slots_per_word); 3274 return nm; 3275 3276 } 3277 3278 #endif // HAVE_DTRACE_H 3279 3280 // this function returns the adjust size (in number of words) to a c2i adapter 3281 // activation for use during deoptimization 3282 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals ) { 3283 return (callee_locals - callee_parameters) * Interpreter::stackElementWords; 3284 } 3285 3286 3287 uint SharedRuntime::out_preserve_stack_slots() { 3288 return 0; 3289 } 3290 3291 //------------------------------generate_deopt_blob---------------------------- 3292 void SharedRuntime::generate_deopt_blob() { 3293 // Allocate space for the code 3294 ResourceMark rm; 3295 // Setup code generation tools 3296 CodeBuffer buffer("deopt_blob", 2048, 1024); 3297 MacroAssembler* masm = new MacroAssembler(&buffer); 3298 int frame_size_in_words; 3299 OopMap* map = NULL; 3300 OopMapSet *oop_maps = new OopMapSet(); 3301 3302 // ------------- 3303 // This code enters when returning to a de-optimized nmethod. A return 3304 // address has been pushed on the the stack, and return values are in 3305 // registers. 3306 // If we are doing a normal deopt then we were called from the patched 3307 // nmethod from the point we returned to the nmethod. So the return 3308 // address on the stack is wrong by NativeCall::instruction_size 3309 // We will adjust the value so it looks like we have the original return 3310 // address on the stack (like when we eagerly deoptimized). 3311 // In the case of an exception pending when deoptimizing, we enter 3312 // with a return address on the stack that points after the call we patched 3313 // into the exception handler. We have the following register state from, 3314 // e.g., the forward exception stub (see stubGenerator_x86_64.cpp). 3315 // rax: exception oop 3316 // rbx: exception handler 3317 // rdx: throwing pc 3318 // So in this case we simply jam rdx into the useless return address and 3319 // the stack looks just like we want. 3320 // 3321 // At this point we need to de-opt. We save the argument return 3322 // registers. We call the first C routine, fetch_unroll_info(). This 3323 // routine captures the return values and returns a structure which 3324 // describes the current frame size and the sizes of all replacement frames. 3325 // The current frame is compiled code and may contain many inlined 3326 // functions, each with their own JVM state. We pop the current frame, then 3327 // push all the new frames. Then we call the C routine unpack_frames() to 3328 // populate these frames. Finally unpack_frames() returns us the new target 3329 // address. Notice that callee-save registers are BLOWN here; they have 3330 // already been captured in the vframeArray at the time the return PC was 3331 // patched. 3332 address start = __ pc(); 3333 Label cont; 3334 3335 // Prolog for non exception case! 3336 3337 // Save everything in sight. 3338 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); 3339 3340 // Normal deoptimization. Save exec mode for unpack_frames. 3341 __ movl(r14, Deoptimization::Unpack_deopt); // callee-saved 3342 __ jmp(cont); 3343 3344 int reexecute_offset = __ pc() - start; 3345 3346 // Reexecute case 3347 // return address is the pc describes what bci to do re-execute at 3348 3349 // No need to update map as each call to save_live_registers will produce identical oopmap 3350 (void) RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); 3351 3352 __ movl(r14, Deoptimization::Unpack_reexecute); // callee-saved 3353 __ jmp(cont); 3354 3355 int exception_offset = __ pc() - start; 3356 3357 // Prolog for exception case 3358 3359 // all registers are dead at this entry point, except for rax, and 3360 // rdx which contain the exception oop and exception pc 3361 // respectively. Set them in TLS and fall thru to the 3362 // unpack_with_exception_in_tls entry point. 3363 3364 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), rdx); 3365 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), rax); 3366 3367 int exception_in_tls_offset = __ pc() - start; 3368 3369 // new implementation because exception oop is now passed in JavaThread 3370 3371 // Prolog for exception case 3372 // All registers must be preserved because they might be used by LinearScan 3373 // Exceptiop oop and throwing PC are passed in JavaThread 3374 // tos: stack at point of call to method that threw the exception (i.e. only 3375 // args are on the stack, no return address) 3376 3377 // make room on stack for the return address 3378 // It will be patched later with the throwing pc. The correct value is not 3379 // available now because loading it from memory would destroy registers. 3380 __ push(0); 3381 3382 // Save everything in sight. 3383 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); 3384 3385 // Now it is safe to overwrite any register 3386 3387 // Deopt during an exception. Save exec mode for unpack_frames. 3388 __ movl(r14, Deoptimization::Unpack_exception); // callee-saved 3389 3390 // load throwing pc from JavaThread and patch it as the return address 3391 // of the current frame. Then clear the field in JavaThread 3392 3393 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset())); 3394 __ movptr(Address(rbp, wordSize), rdx); 3395 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), (int32_t)NULL_WORD); 3396 3397 #ifdef ASSERT 3398 // verify that there is really an exception oop in JavaThread 3399 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset())); 3400 __ verify_oop(rax); 3401 3402 // verify that there is no pending exception 3403 Label no_pending_exception; 3404 __ movptr(rax, Address(r15_thread, Thread::pending_exception_offset())); 3405 __ testptr(rax, rax); 3406 __ jcc(Assembler::zero, no_pending_exception); 3407 __ stop("must not have pending exception here"); 3408 __ bind(no_pending_exception); 3409 #endif 3410 3411 __ bind(cont); 3412 3413 // Call C code. Need thread and this frame, but NOT official VM entry 3414 // crud. We cannot block on this call, no GC can happen. 3415 // 3416 // UnrollBlock* fetch_unroll_info(JavaThread* thread) 3417 3418 // fetch_unroll_info needs to call last_java_frame(). 3419 3420 __ set_last_Java_frame(noreg, noreg, NULL); 3421 #ifdef ASSERT 3422 { Label L; 3423 __ cmpptr(Address(r15_thread, 3424 JavaThread::last_Java_fp_offset()), 3425 (int32_t)0); 3426 __ jcc(Assembler::equal, L); 3427 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared"); 3428 __ bind(L); 3429 } 3430 #endif // ASSERT 3431 __ mov(c_rarg0, r15_thread); 3432 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info))); 3433 3434 // Need to have an oopmap that tells fetch_unroll_info where to 3435 // find any register it might need. 3436 oop_maps->add_gc_map(__ pc() - start, map); 3437 3438 __ reset_last_Java_frame(false, false); 3439 3440 // Load UnrollBlock* into rdi 3441 __ mov(rdi, rax); 3442 3443 Label noException; 3444 __ cmpl(r14, Deoptimization::Unpack_exception); // Was exception pending? 3445 __ jcc(Assembler::notEqual, noException); 3446 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset())); 3447 // QQQ this is useless it was NULL above 3448 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset())); 3449 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), (int32_t)NULL_WORD); 3450 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), (int32_t)NULL_WORD); 3451 3452 __ verify_oop(rax); 3453 3454 // Overwrite the result registers with the exception results. 3455 __ movptr(Address(rsp, RegisterSaver::rax_offset_in_bytes()), rax); 3456 // I think this is useless 3457 __ movptr(Address(rsp, RegisterSaver::rdx_offset_in_bytes()), rdx); 3458 3459 __ bind(noException); 3460 3461 // Only register save data is on the stack. 3462 // Now restore the result registers. Everything else is either dead 3463 // or captured in the vframeArray. 3464 RegisterSaver::restore_result_registers(masm); 3465 3466 // All of the register save area has been popped of the stack. Only the 3467 // return address remains. 3468 3469 // Pop all the frames we must move/replace. 3470 // 3471 // Frame picture (youngest to oldest) 3472 // 1: self-frame (no frame link) 3473 // 2: deopting frame (no frame link) 3474 // 3: caller of deopting frame (could be compiled/interpreted). 3475 // 3476 // Note: by leaving the return address of self-frame on the stack 3477 // and using the size of frame 2 to adjust the stack 3478 // when we are done the return to frame 3 will still be on the stack. 3479 3480 // Pop deoptimized frame 3481 __ movl(rcx, Address(rdi, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset_in_bytes())); 3482 __ addptr(rsp, rcx); 3483 3484 // rsp should be pointing at the return address to the caller (3) 3485 3486 // Pick up the initial fp we should save 3487 // restore rbp before stack bang because if stack overflow is thrown it needs to be pushed (and preserved) 3488 __ movptr(rbp, Address(rdi, Deoptimization::UnrollBlock::initial_info_offset_in_bytes())); 3489 3490 #ifdef ASSERT 3491 // Compilers generate code that bang the stack by as much as the 3492 // interpreter would need. So this stack banging should never 3493 // trigger a fault. Verify that it does not on non product builds. 3494 if (UseStackBanging) { 3495 __ movl(rbx, Address(rdi, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes())); 3496 __ bang_stack_size(rbx, rcx); 3497 } 3498 #endif 3499 3500 // Load address of array of frame pcs into rcx 3501 __ movptr(rcx, Address(rdi, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes())); 3502 3503 // Trash the old pc 3504 __ addptr(rsp, wordSize); 3505 3506 // Load address of array of frame sizes into rsi 3507 __ movptr(rsi, Address(rdi, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes())); 3508 3509 // Load counter into rdx 3510 __ movl(rdx, Address(rdi, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes())); 3511 3512 // Now adjust the caller's stack to make up for the extra locals 3513 // but record the original sp so that we can save it in the skeletal interpreter 3514 // frame and the stack walking of interpreter_sender will get the unextended sp 3515 // value and not the "real" sp value. 3516 3517 const Register sender_sp = r8; 3518 3519 __ mov(sender_sp, rsp); 3520 __ movl(rbx, Address(rdi, 3521 Deoptimization::UnrollBlock:: 3522 caller_adjustment_offset_in_bytes())); 3523 __ subptr(rsp, rbx); 3524 3525 // Push interpreter frames in a loop 3526 Label loop; 3527 __ bind(loop); 3528 __ movptr(rbx, Address(rsi, 0)); // Load frame size 3529 #ifdef CC_INTERP 3530 __ subptr(rbx, 4*wordSize); // we'll push pc and ebp by hand and 3531 #ifdef ASSERT 3532 __ push(0xDEADDEAD); // Make a recognizable pattern 3533 __ push(0xDEADDEAD); 3534 #else /* ASSERT */ 3535 __ subptr(rsp, 2*wordSize); // skip the "static long no_param" 3536 #endif /* ASSERT */ 3537 #else 3538 __ subptr(rbx, 2*wordSize); // We'll push pc and ebp by hand 3539 #endif // CC_INTERP 3540 __ pushptr(Address(rcx, 0)); // Save return address 3541 __ enter(); // Save old & set new ebp 3542 __ subptr(rsp, rbx); // Prolog 3543 #ifdef CC_INTERP 3544 __ movptr(Address(rbp, 3545 -(sizeof(BytecodeInterpreter)) + in_bytes(byte_offset_of(BytecodeInterpreter, _sender_sp))), 3546 sender_sp); // Make it walkable 3547 #else /* CC_INTERP */ 3548 // This value is corrected by layout_activation_impl 3549 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD ); 3550 __ movptr(Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize), sender_sp); // Make it walkable 3551 #endif /* CC_INTERP */ 3552 __ mov(sender_sp, rsp); // Pass sender_sp to next frame 3553 __ addptr(rsi, wordSize); // Bump array pointer (sizes) 3554 __ addptr(rcx, wordSize); // Bump array pointer (pcs) 3555 __ decrementl(rdx); // Decrement counter 3556 __ jcc(Assembler::notZero, loop); 3557 __ pushptr(Address(rcx, 0)); // Save final return address 3558 3559 // Re-push self-frame 3560 __ enter(); // Save old & set new ebp 3561 3562 // Allocate a full sized register save area. 3563 // Return address and rbp are in place, so we allocate two less words. 3564 __ subptr(rsp, (frame_size_in_words - 2) * wordSize); 3565 3566 // Restore frame locals after moving the frame 3567 __ movdbl(Address(rsp, RegisterSaver::xmm0_offset_in_bytes()), xmm0); 3568 __ movptr(Address(rsp, RegisterSaver::rax_offset_in_bytes()), rax); 3569 3570 // Call C code. Need thread but NOT official VM entry 3571 // crud. We cannot block on this call, no GC can happen. Call should 3572 // restore return values to their stack-slots with the new SP. 3573 // 3574 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode) 3575 3576 // Use rbp because the frames look interpreted now 3577 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP. 3578 // Don't need the precise return PC here, just precise enough to point into this code blob. 3579 address the_pc = __ pc(); 3580 __ set_last_Java_frame(noreg, rbp, the_pc); 3581 3582 __ andptr(rsp, -(StackAlignmentInBytes)); // Fix stack alignment as required by ABI 3583 __ mov(c_rarg0, r15_thread); 3584 __ movl(c_rarg1, r14); // second arg: exec_mode 3585 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); 3586 // Revert SP alignment after call since we're going to do some SP relative addressing below 3587 __ movptr(rsp, Address(r15_thread, JavaThread::last_Java_sp_offset())); 3588 3589 // Set an oopmap for the call site 3590 // Use the same PC we used for the last java frame 3591 oop_maps->add_gc_map(the_pc - start, 3592 new OopMap( frame_size_in_words, 0 )); 3593 3594 // Clear fp AND pc 3595 __ reset_last_Java_frame(true, true); 3596 3597 // Collect return values 3598 __ movdbl(xmm0, Address(rsp, RegisterSaver::xmm0_offset_in_bytes())); 3599 __ movptr(rax, Address(rsp, RegisterSaver::rax_offset_in_bytes())); 3600 // I think this is useless (throwing pc?) 3601 __ movptr(rdx, Address(rsp, RegisterSaver::rdx_offset_in_bytes())); 3602 3603 // Pop self-frame. 3604 __ leave(); // Epilog 3605 3606 // Jump to interpreter 3607 __ ret(0); 3608 3609 // Make sure all code is generated 3610 masm->flush(); 3611 3612 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words); 3613 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset); 3614 } 3615 3616 #ifdef COMPILER2 3617 //------------------------------generate_uncommon_trap_blob-------------------- 3618 void SharedRuntime::generate_uncommon_trap_blob() { 3619 // Allocate space for the code 3620 ResourceMark rm; 3621 // Setup code generation tools 3622 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024); 3623 MacroAssembler* masm = new MacroAssembler(&buffer); 3624 3625 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); 3626 3627 address start = __ pc(); 3628 3629 if (UseRTMLocking) { 3630 // Abort RTM transaction before possible nmethod deoptimization. 3631 __ xabort(0); 3632 } 3633 3634 // Push self-frame. We get here with a return address on the 3635 // stack, so rsp is 8-byte aligned until we allocate our frame. 3636 __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog! 3637 3638 // No callee saved registers. rbp is assumed implicitly saved 3639 __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp); 3640 3641 // compiler left unloaded_class_index in j_rarg0 move to where the 3642 // runtime expects it. 3643 __ movl(c_rarg1, j_rarg0); 3644 3645 __ set_last_Java_frame(noreg, noreg, NULL); 3646 3647 // Call C code. Need thread but NOT official VM entry 3648 // crud. We cannot block on this call, no GC can happen. Call should 3649 // capture callee-saved registers as well as return values. 3650 // Thread is in rdi already. 3651 // 3652 // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); 3653 3654 __ mov(c_rarg0, r15_thread); 3655 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap))); 3656 3657 // Set an oopmap for the call site 3658 OopMapSet* oop_maps = new OopMapSet(); 3659 OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0); 3660 3661 // location of rbp is known implicitly by the frame sender code 3662 3663 oop_maps->add_gc_map(__ pc() - start, map); 3664 3665 __ reset_last_Java_frame(false, false); 3666 3667 // Load UnrollBlock* into rdi 3668 __ mov(rdi, rax); 3669 3670 // Pop all the frames we must move/replace. 3671 // 3672 // Frame picture (youngest to oldest) 3673 // 1: self-frame (no frame link) 3674 // 2: deopting frame (no frame link) 3675 // 3: caller of deopting frame (could be compiled/interpreted). 3676 3677 // Pop self-frame. We have no frame, and must rely only on rax and rsp. 3678 __ addptr(rsp, (SimpleRuntimeFrame::framesize - 2) << LogBytesPerInt); // Epilog! 3679 3680 // Pop deoptimized frame (int) 3681 __ movl(rcx, Address(rdi, 3682 Deoptimization::UnrollBlock:: 3683 size_of_deoptimized_frame_offset_in_bytes())); 3684 __ addptr(rsp, rcx); 3685 3686 // rsp should be pointing at the return address to the caller (3) 3687 3688 // Pick up the initial fp we should save 3689 // restore rbp before stack bang because if stack overflow is thrown it needs to be pushed (and preserved) 3690 __ movptr(rbp, Address(rdi, Deoptimization::UnrollBlock::initial_info_offset_in_bytes())); 3691 3692 #ifdef ASSERT 3693 // Compilers generate code that bang the stack by as much as the 3694 // interpreter would need. So this stack banging should never 3695 // trigger a fault. Verify that it does not on non product builds. 3696 if (UseStackBanging) { 3697 __ movl(rbx, Address(rdi ,Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes())); 3698 __ bang_stack_size(rbx, rcx); 3699 } 3700 #endif 3701 3702 // Load address of array of frame pcs into rcx (address*) 3703 __ movptr(rcx, Address(rdi, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes())); 3704 3705 // Trash the return pc 3706 __ addptr(rsp, wordSize); 3707 3708 // Load address of array of frame sizes into rsi (intptr_t*) 3709 __ movptr(rsi, Address(rdi, Deoptimization::UnrollBlock:: frame_sizes_offset_in_bytes())); 3710 3711 // Counter 3712 __ movl(rdx, Address(rdi, Deoptimization::UnrollBlock:: number_of_frames_offset_in_bytes())); // (int) 3713 3714 // Now adjust the caller's stack to make up for the extra locals but 3715 // record the original sp so that we can save it in the skeletal 3716 // interpreter frame and the stack walking of interpreter_sender 3717 // will get the unextended sp value and not the "real" sp value. 3718 3719 const Register sender_sp = r8; 3720 3721 __ mov(sender_sp, rsp); 3722 __ movl(rbx, Address(rdi, Deoptimization::UnrollBlock:: caller_adjustment_offset_in_bytes())); // (int) 3723 __ subptr(rsp, rbx); 3724 3725 // Push interpreter frames in a loop 3726 Label loop; 3727 __ bind(loop); 3728 __ movptr(rbx, Address(rsi, 0)); // Load frame size 3729 __ subptr(rbx, 2 * wordSize); // We'll push pc and rbp by hand 3730 __ pushptr(Address(rcx, 0)); // Save return address 3731 __ enter(); // Save old & set new rbp 3732 __ subptr(rsp, rbx); // Prolog 3733 #ifdef CC_INTERP 3734 __ movptr(Address(rbp, 3735 -(sizeof(BytecodeInterpreter)) + in_bytes(byte_offset_of(BytecodeInterpreter, _sender_sp))), 3736 sender_sp); // Make it walkable 3737 #else // CC_INTERP 3738 __ movptr(Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize), 3739 sender_sp); // Make it walkable 3740 // This value is corrected by layout_activation_impl 3741 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD ); 3742 #endif // CC_INTERP 3743 __ mov(sender_sp, rsp); // Pass sender_sp to next frame 3744 __ addptr(rsi, wordSize); // Bump array pointer (sizes) 3745 __ addptr(rcx, wordSize); // Bump array pointer (pcs) 3746 __ decrementl(rdx); // Decrement counter 3747 __ jcc(Assembler::notZero, loop); 3748 __ pushptr(Address(rcx, 0)); // Save final return address 3749 3750 // Re-push self-frame 3751 __ enter(); // Save old & set new rbp 3752 __ subptr(rsp, (SimpleRuntimeFrame::framesize - 4) << LogBytesPerInt); 3753 // Prolog 3754 3755 // Use rbp because the frames look interpreted now 3756 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP. 3757 // Don't need the precise return PC here, just precise enough to point into this code blob. 3758 address the_pc = __ pc(); 3759 __ set_last_Java_frame(noreg, rbp, the_pc); 3760 3761 // Call C code. Need thread but NOT official VM entry 3762 // crud. We cannot block on this call, no GC can happen. Call should 3763 // restore return values to their stack-slots with the new SP. 3764 // Thread is in rdi already. 3765 // 3766 // BasicType unpack_frames(JavaThread* thread, int exec_mode); 3767 3768 __ andptr(rsp, -(StackAlignmentInBytes)); // Align SP as required by ABI 3769 __ mov(c_rarg0, r15_thread); 3770 __ movl(c_rarg1, Deoptimization::Unpack_uncommon_trap); 3771 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); 3772 3773 // Set an oopmap for the call site 3774 // Use the same PC we used for the last java frame 3775 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); 3776 3777 // Clear fp AND pc 3778 __ reset_last_Java_frame(true, true); 3779 3780 // Pop self-frame. 3781 __ leave(); // Epilog 3782 3783 // Jump to interpreter 3784 __ ret(0); 3785 3786 // Make sure all code is generated 3787 masm->flush(); 3788 3789 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps, 3790 SimpleRuntimeFrame::framesize >> 1); 3791 } 3792 #endif // COMPILER2 3793 3794 3795 //------------------------------generate_handler_blob------ 3796 // 3797 // Generate a special Compile2Runtime blob that saves all registers, 3798 // and setup oopmap. 3799 // 3800 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) { 3801 assert(StubRoutines::forward_exception_entry() != NULL, 3802 "must be generated before"); 3803 3804 ResourceMark rm; 3805 OopMapSet *oop_maps = new OopMapSet(); 3806 OopMap* map; 3807 3808 // Allocate space for the code. Setup code generation tools. 3809 CodeBuffer buffer("handler_blob", 2048, 1024); 3810 MacroAssembler* masm = new MacroAssembler(&buffer); 3811 3812 address start = __ pc(); 3813 address call_pc = NULL; 3814 int frame_size_in_words; 3815 bool cause_return = (poll_type == POLL_AT_RETURN); 3816 bool save_vectors = (poll_type == POLL_AT_VECTOR_LOOP); 3817 3818 if (UseRTMLocking) { 3819 // Abort RTM transaction before calling runtime 3820 // because critical section will be large and will be 3821 // aborted anyway. Also nmethod could be deoptimized. 3822 __ xabort(0); 3823 } 3824 3825 // Make room for return address (or push it again) 3826 if (!cause_return) { 3827 __ push(rbx); 3828 } 3829 3830 // Save registers, fpu state, and flags 3831 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words, save_vectors); 3832 3833 // The following is basically a call_VM. However, we need the precise 3834 // address of the call in order to generate an oopmap. Hence, we do all the 3835 // work outselves. 3836 3837 __ set_last_Java_frame(noreg, noreg, NULL); 3838 3839 // The return address must always be correct so that frame constructor never 3840 // sees an invalid pc. 3841 3842 if (!cause_return) { 3843 // overwrite the dummy value we pushed on entry 3844 __ movptr(c_rarg0, Address(r15_thread, JavaThread::saved_exception_pc_offset())); 3845 __ movptr(Address(rbp, wordSize), c_rarg0); 3846 } 3847 3848 // Do the call 3849 __ mov(c_rarg0, r15_thread); 3850 __ call(RuntimeAddress(call_ptr)); 3851 3852 // Set an oopmap for the call site. This oopmap will map all 3853 // oop-registers and debug-info registers as callee-saved. This 3854 // will allow deoptimization at this safepoint to find all possible 3855 // debug-info recordings, as well as let GC find all oops. 3856 3857 oop_maps->add_gc_map( __ pc() - start, map); 3858 3859 Label noException; 3860 3861 __ reset_last_Java_frame(false, false); 3862 3863 __ cmpptr(Address(r15_thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD); 3864 __ jcc(Assembler::equal, noException); 3865 3866 // Exception pending 3867 3868 RegisterSaver::restore_live_registers(masm, save_vectors); 3869 3870 __ jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 3871 3872 // No exception case 3873 __ bind(noException); 3874 3875 // Normal exit, restore registers and exit. 3876 RegisterSaver::restore_live_registers(masm, save_vectors); 3877 3878 __ ret(0); 3879 3880 // Make sure all code is generated 3881 masm->flush(); 3882 3883 // Fill-out other meta info 3884 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words); 3885 } 3886 3887 // 3888 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss 3889 // 3890 // Generate a stub that calls into vm to find out the proper destination 3891 // of a java call. All the argument registers are live at this point 3892 // but since this is generic code we don't know what they are and the caller 3893 // must do any gc of the args. 3894 // 3895 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) { 3896 assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before"); 3897 3898 // allocate space for the code 3899 ResourceMark rm; 3900 3901 CodeBuffer buffer(name, 1000, 512); 3902 MacroAssembler* masm = new MacroAssembler(&buffer); 3903 3904 int frame_size_in_words; 3905 3906 OopMapSet *oop_maps = new OopMapSet(); 3907 OopMap* map = NULL; 3908 3909 int start = __ offset(); 3910 3911 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); 3912 3913 int frame_complete = __ offset(); 3914 3915 __ set_last_Java_frame(noreg, noreg, NULL); 3916 3917 __ mov(c_rarg0, r15_thread); 3918 3919 __ call(RuntimeAddress(destination)); 3920 3921 3922 // Set an oopmap for the call site. 3923 // We need this not only for callee-saved registers, but also for volatile 3924 // registers that the compiler might be keeping live across a safepoint. 3925 3926 oop_maps->add_gc_map( __ offset() - start, map); 3927 3928 // rax contains the address we are going to jump to assuming no exception got installed 3929 3930 // clear last_Java_sp 3931 __ reset_last_Java_frame(false, false); 3932 // check for pending exceptions 3933 Label pending; 3934 __ cmpptr(Address(r15_thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD); 3935 __ jcc(Assembler::notEqual, pending); 3936 3937 // get the returned Method* 3938 __ get_vm_result_2(rbx, r15_thread); 3939 __ movptr(Address(rsp, RegisterSaver::rbx_offset_in_bytes()), rbx); 3940 3941 __ movptr(Address(rsp, RegisterSaver::rax_offset_in_bytes()), rax); 3942 3943 RegisterSaver::restore_live_registers(masm); 3944 3945 // We are back the the original state on entry and ready to go. 3946 3947 __ jmp(rax); 3948 3949 // Pending exception after the safepoint 3950 3951 __ bind(pending); 3952 3953 RegisterSaver::restore_live_registers(masm); 3954 3955 // exception pending => remove activation and forward to exception handler 3956 3957 __ movptr(Address(r15_thread, JavaThread::vm_result_offset()), (int)NULL_WORD); 3958 3959 __ movptr(rax, Address(r15_thread, Thread::pending_exception_offset())); 3960 __ jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 3961 3962 // ------------- 3963 // make sure all code is generated 3964 masm->flush(); 3965 3966 // return the blob 3967 // frame_size_words or bytes?? 3968 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true); 3969 } 3970 3971 // 3972 // generate_memento_stack_trace_blob - trampoline for memento stack trace 3973 // 3974 void SharedRuntime::generate_memento_stack_trace_blob() { 3975 // allocate space for the code 3976 ResourceMark rm; 3977 3978 CodeBuffer buffer("memento_stack_trace_blob", 1000, 512); 3979 MacroAssembler* masm = new MacroAssembler(&buffer); 3980 3981 // Entry point for function returns 3982 int return_offset = __ offset(); 3983 3984 __ movptr(rscratch1, Address(r15_thread, Thread::memento_original_return_address_offset())); 3985 __ movptr(Address(r15_thread, Thread::memento_original_return_address_offset()), (int32_t) 0); 3986 __ jmp(rscratch1); 3987 3988 // Exception handler entry point 3989 int exception_offset = __ offset(); 3990 3991 // return address of handler in rdx, overwrite with original return address 3992 __ movptr(rdx, Address(r15_thread, Thread::memento_original_return_address_offset())); 3993 __ movptr(Address(r15_thread, Thread::memento_original_return_address_offset()), (int32_t) 0); 3994 3995 // Inbetween activations - previous activation type unknown yet 3996 // compute continuation point - the continuation point expects 3997 // the following registers set up: 3998 // 3999 // rax: exception 4000 // rdx: return address/pc that threw exception 4001 // rsp: expression stack of caller 4002 // rbp: rbp, of caller 4003 __ push(rax); // save exception 4004 __ push(rdx); // save return address 4005 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), r15_thread, rdx); 4006 __ mov(rbx, rax); // save exception handler 4007 __ pop(rdx); // restore return address 4008 __ pop(rax); // restore exception 4009 // Note that an "issuing PC" is actually the next PC after the call 4010 __ jmp(rbx); // jump to exception handler of caller 4011 4012 // ------------- 4013 // make sure all code is generated 4014 masm->flush(); 4015 4016 // return the blob 4017 // frame_size_words or bytes?? 4018 RuntimeStub* stub = RuntimeStub::new_runtime_stub("memento_stack_trace_blob", &buffer, return_offset, 0, NULL, true); 4019 4020 _memento_stack_trace_return_handler = stub->code_begin() + return_offset; 4021 _memento_stack_trace_exception_handler = stub->code_begin() + exception_offset; 4022 } 4023 4024 4025 //------------------------------Montgomery multiplication------------------------ 4026 // 4027 4028 #ifndef _WINDOWS 4029 4030 #define ASM_SUBTRACT 4031 4032 #ifdef ASM_SUBTRACT 4033 // Subtract 0:b from carry:a. Return carry. 4034 static unsigned long 4035 sub(unsigned long a[], unsigned long b[], unsigned long carry, long len) { 4036 long i = 0, cnt = len; 4037 unsigned long tmp; 4038 asm volatile("clc; " 4039 "0: ; " 4040 "mov (%[b], %[i], 8), %[tmp]; " 4041 "sbb %[tmp], (%[a], %[i], 8); " 4042 "inc %[i]; dec %[cnt]; " 4043 "jne 0b; " 4044 "mov %[carry], %[tmp]; sbb $0, %[tmp]; " 4045 : [i]"+r"(i), [cnt]"+r"(cnt), [tmp]"=&r"(tmp) 4046 : [a]"r"(a), [b]"r"(b), [carry]"r"(carry) 4047 : "memory"); 4048 return tmp; 4049 } 4050 #else // ASM_SUBTRACT 4051 typedef int __attribute__((mode(TI))) int128; 4052 4053 // Subtract 0:b from carry:a. Return carry. 4054 static unsigned long 4055 sub(unsigned long a[], unsigned long b[], unsigned long carry, int len) { 4056 int128 tmp = 0; 4057 int i; 4058 for (i = 0; i < len; i++) { 4059 tmp += a[i]; 4060 tmp -= b[i]; 4061 a[i] = tmp; 4062 tmp >>= 64; 4063 assert(-1 <= tmp && tmp <= 0, "invariant"); 4064 } 4065 return tmp + carry; 4066 } 4067 #endif // ! ASM_SUBTRACT 4068 4069 // Multiply (unsigned) Long A by Long B, accumulating the double- 4070 // length result into the accumulator formed of T0, T1, and T2. 4071 #define MACC(A, B, T0, T1, T2) \ 4072 do { \ 4073 unsigned long hi, lo; \ 4074 asm volatile("mul %5; add %%rax, %2; adc %%rdx, %3; adc $0, %4" \ 4075 : "=&d"(hi), "=a"(lo), "+r"(T0), "+r"(T1), "+g"(T2) \ 4076 : "r"(A), "a"(B) : "cc"); \ 4077 } while(0) 4078 4079 // As above, but add twice the double-length result into the 4080 // accumulator. 4081 #define MACC2(A, B, T0, T1, T2) \ 4082 do { \ 4083 unsigned long hi, lo; \ 4084 asm volatile("mul %5; add %%rax, %2; adc %%rdx, %3; adc $0, %4;" \ 4085 "add %%rax, %2; adc %%rdx, %3; adc $0, %4" \ 4086 : "=&d"(hi), "=a"(lo), "+r"(T0), "+r"(T1), "+g"(T2) \ 4087 : "r"(A), "a"(B) : "cc"); \ 4088 } while(0) 4089 4090 // Fast Montgomery multiplication. The derivation of the algorithm is 4091 // in A Cryptographic Library for the Motorola DSP56000, 4092 // Dusse and Kaliski, Proc. EUROCRYPT 90, pp. 230-237. 4093 4094 static void __attribute__((noinline)) 4095 montgomery_multiply(unsigned long a[], unsigned long b[], unsigned long n[], 4096 unsigned long m[], unsigned long inv, int len) { 4097 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator 4098 int i; 4099 4100 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply"); 4101 4102 for (i = 0; i < len; i++) { 4103 int j; 4104 for (j = 0; j < i; j++) { 4105 MACC(a[j], b[i-j], t0, t1, t2); 4106 MACC(m[j], n[i-j], t0, t1, t2); 4107 } 4108 MACC(a[i], b[0], t0, t1, t2); 4109 m[i] = t0 * inv; 4110 MACC(m[i], n[0], t0, t1, t2); 4111 4112 assert(t0 == 0, "broken Montgomery multiply"); 4113 4114 t0 = t1; t1 = t2; t2 = 0; 4115 } 4116 4117 for (i = len; i < 2*len; i++) { 4118 int j; 4119 for (j = i-len+1; j < len; j++) { 4120 MACC(a[j], b[i-j], t0, t1, t2); 4121 MACC(m[j], n[i-j], t0, t1, t2); 4122 } 4123 m[i-len] = t0; 4124 t0 = t1; t1 = t2; t2 = 0; 4125 } 4126 4127 while (t0) 4128 t0 = sub(m, n, t0, len); 4129 } 4130 4131 // Fast Montgomery squaring. This uses asymptotically 25% fewer 4132 // multiplies so it should be up to 25% faster than Montgomery 4133 // multiplication. However, its loop control is more complex and it 4134 // may actually run slower on some machines. 4135 4136 static void __attribute__((noinline)) 4137 montgomery_square(unsigned long a[], unsigned long n[], 4138 unsigned long m[], unsigned long inv, int len) { 4139 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator 4140 int i; 4141 4142 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply"); 4143 4144 for (i = 0; i < len; i++) { 4145 int j; 4146 int end = (i+1)/2; 4147 for (j = 0; j < end; j++) { 4148 MACC2(a[j], a[i-j], t0, t1, t2); 4149 MACC(m[j], n[i-j], t0, t1, t2); 4150 } 4151 if ((i & 1) == 0) { 4152 MACC(a[j], a[j], t0, t1, t2); 4153 } 4154 for (; j < i; j++) { 4155 MACC(m[j], n[i-j], t0, t1, t2); 4156 } 4157 m[i] = t0 * inv; 4158 MACC(m[i], n[0], t0, t1, t2); 4159 4160 assert(t0 == 0, "broken Montgomery square"); 4161 4162 t0 = t1; t1 = t2; t2 = 0; 4163 } 4164 4165 for (i = len; i < 2*len; i++) { 4166 int start = i-len+1; 4167 int end = start + (len - start)/2; 4168 int j; 4169 for (j = start; j < end; j++) { 4170 MACC2(a[j], a[i-j], t0, t1, t2); 4171 MACC(m[j], n[i-j], t0, t1, t2); 4172 } 4173 if ((i & 1) == 0) { 4174 MACC(a[j], a[j], t0, t1, t2); 4175 } 4176 for (; j < len; j++) { 4177 MACC(m[j], n[i-j], t0, t1, t2); 4178 } 4179 m[i-len] = t0; 4180 t0 = t1; t1 = t2; t2 = 0; 4181 } 4182 4183 while (t0) 4184 t0 = sub(m, n, t0, len); 4185 } 4186 4187 // Swap words in a longword. 4188 static unsigned long swap(unsigned long x) { 4189 return (x << 32) | (x >> 32); 4190 } 4191 4192 // Copy len longwords from s to d, word-swapping as we go. The 4193 // destination array is reversed. 4194 static void reverse_words(unsigned long *s, unsigned long *d, int len) { 4195 d += len; 4196 while(len-- > 0) { 4197 d--; 4198 *d = swap(*s); 4199 s++; 4200 } 4201 } 4202 4203 // The threshold at which squaring is advantageous was determined 4204 // experimentally on an i7-3930K (Ivy Bridge) CPU @ 3.5GHz. 4205 #define MONTGOMERY_SQUARING_THRESHOLD 64 4206 4207 void SharedRuntime::montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, 4208 jint len, jlong inv, 4209 jint *m_ints) { 4210 assert(len % 2 == 0, "array length in montgomery_multiply must be even"); 4211 int longwords = len/2; 4212 4213 // Make very sure we don't use so much space that the stack might 4214 // overflow. 512 jints corresponds to an 16384-bit integer and 4215 // will use here a total of 8k bytes of stack space. 4216 int total_allocation = longwords * sizeof (unsigned long) * 4; 4217 guarantee(total_allocation <= 8192, "must be"); 4218 unsigned long *scratch = (unsigned long *)alloca(total_allocation); 4219 4220 // Local scratch arrays 4221 unsigned long 4222 *a = scratch + 0 * longwords, 4223 *b = scratch + 1 * longwords, 4224 *n = scratch + 2 * longwords, 4225 *m = scratch + 3 * longwords; 4226 4227 reverse_words((unsigned long *)a_ints, a, longwords); 4228 reverse_words((unsigned long *)b_ints, b, longwords); 4229 reverse_words((unsigned long *)n_ints, n, longwords); 4230 4231 ::montgomery_multiply(a, b, n, m, (unsigned long)inv, longwords); 4232 4233 reverse_words(m, (unsigned long *)m_ints, longwords); 4234 } 4235 4236 void SharedRuntime::montgomery_square(jint *a_ints, jint *n_ints, 4237 jint len, jlong inv, 4238 jint *m_ints) { 4239 assert(len % 2 == 0, "array length in montgomery_square must be even"); 4240 int longwords = len/2; 4241 4242 // Make very sure we don't use so much space that the stack might 4243 // overflow. 512 jints corresponds to an 16384-bit integer and 4244 // will use here a total of 6k bytes of stack space. 4245 int total_allocation = longwords * sizeof (unsigned long) * 3; 4246 guarantee(total_allocation <= 8192, "must be"); 4247 unsigned long *scratch = (unsigned long *)alloca(total_allocation); 4248 4249 // Local scratch arrays 4250 unsigned long 4251 *a = scratch + 0 * longwords, 4252 *n = scratch + 1 * longwords, 4253 *m = scratch + 2 * longwords; 4254 4255 reverse_words((unsigned long *)a_ints, a, longwords); 4256 reverse_words((unsigned long *)n_ints, n, longwords); 4257 4258 //montgomery_square fails to pass BigIntegerTest on solaris amd64 4259 //on jdk7 and jdk8. 4260 #ifndef SOLARIS 4261 if (len >= MONTGOMERY_SQUARING_THRESHOLD) { 4262 #else 4263 if (0) { 4264 #endif 4265 ::montgomery_square(a, n, m, (unsigned long)inv, longwords); 4266 } else { 4267 ::montgomery_multiply(a, a, n, m, (unsigned long)inv, longwords); 4268 } 4269 4270 reverse_words(m, (unsigned long *)m_ints, longwords); 4271 } 4272 4273 #endif // WINDOWS 4274 4275 #ifdef COMPILER2 4276 // This is here instead of runtime_x86_64.cpp because it uses SimpleRuntimeFrame 4277 // 4278 //------------------------------generate_exception_blob--------------------------- 4279 // creates exception blob at the end 4280 // Using exception blob, this code is jumped from a compiled method. 4281 // (see emit_exception_handler in x86_64.ad file) 4282 // 4283 // Given an exception pc at a call we call into the runtime for the 4284 // handler in this method. This handler might merely restore state 4285 // (i.e. callee save registers) unwind the frame and jump to the 4286 // exception handler for the nmethod if there is no Java level handler 4287 // for the nmethod. 4288 // 4289 // This code is entered with a jmp. 4290 // 4291 // Arguments: 4292 // rax: exception oop 4293 // rdx: exception pc 4294 // 4295 // Results: 4296 // rax: exception oop 4297 // rdx: exception pc in caller or ??? 4298 // destination: exception handler of caller 4299 // 4300 // Note: the exception pc MUST be at a call (precise debug information) 4301 // Registers rax, rdx, rcx, rsi, rdi, r8-r11 are not callee saved. 4302 // 4303 4304 void OptoRuntime::generate_exception_blob() { 4305 assert(!OptoRuntime::is_callee_saved_register(RDX_num), ""); 4306 assert(!OptoRuntime::is_callee_saved_register(RAX_num), ""); 4307 assert(!OptoRuntime::is_callee_saved_register(RCX_num), ""); 4308 4309 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); 4310 4311 // Allocate space for the code 4312 ResourceMark rm; 4313 // Setup code generation tools 4314 CodeBuffer buffer("exception_blob", 2048, 1024); 4315 MacroAssembler* masm = new MacroAssembler(&buffer); 4316 4317 4318 address start = __ pc(); 4319 4320 // Exception pc is 'return address' for stack walker 4321 __ push(rdx); 4322 __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Prolog 4323 4324 // Save callee-saved registers. See x86_64.ad. 4325 4326 // rbp is an implicitly saved callee saved register (i.e., the calling 4327 // convention will save/restore it in the prolog/epilog). Other than that 4328 // there are no callee save registers now that adapter frames are gone. 4329 4330 __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp); 4331 4332 // Store exception in Thread object. We cannot pass any arguments to the 4333 // handle_exception call, since we do not want to make any assumption 4334 // about the size of the frame where the exception happened in. 4335 // c_rarg0 is either rdi (Linux) or rcx (Windows). 4336 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()),rax); 4337 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), rdx); 4338 4339 // This call does all the hard work. It checks if an exception handler 4340 // exists in the method. 4341 // If so, it returns the handler address. 4342 // If not, it prepares for stack-unwinding, restoring the callee-save 4343 // registers of the frame being removed. 4344 // 4345 // address OptoRuntime::handle_exception_C(JavaThread* thread) 4346 4347 // At a method handle call, the stack may not be properly aligned 4348 // when returning with an exception. 4349 address the_pc = __ pc(); 4350 __ set_last_Java_frame(noreg, noreg, the_pc); 4351 __ mov(c_rarg0, r15_thread); 4352 __ andptr(rsp, -(StackAlignmentInBytes)); // Align stack 4353 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C))); 4354 4355 // Set an oopmap for the call site. This oopmap will only be used if we 4356 // are unwinding the stack. Hence, all locations will be dead. 4357 // Callee-saved registers will be the same as the frame above (i.e., 4358 // handle_exception_stub), since they were restored when we got the 4359 // exception. 4360 4361 OopMapSet* oop_maps = new OopMapSet(); 4362 4363 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); 4364 4365 __ reset_last_Java_frame(false, true); 4366 4367 // Restore callee-saved registers 4368 4369 // rbp is an implicitly saved callee-saved register (i.e., the calling 4370 // convention will save restore it in prolog/epilog) Other than that 4371 // there are no callee save registers now that adapter frames are gone. 4372 4373 __ movptr(rbp, Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt)); 4374 4375 __ addptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog 4376 __ pop(rdx); // No need for exception pc anymore 4377 4378 // rax: exception handler 4379 4380 // We have a handler in rax (could be deopt blob). 4381 __ mov(r8, rax); 4382 4383 // Get the exception oop 4384 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset())); 4385 // Get the exception pc in case we are deoptimized 4386 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset())); 4387 #ifdef ASSERT 4388 __ movptr(Address(r15_thread, JavaThread::exception_handler_pc_offset()), (int)NULL_WORD); 4389 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), (int)NULL_WORD); 4390 #endif 4391 // Clear the exception oop so GC no longer processes it as a root. 4392 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), (int)NULL_WORD); 4393 4394 // rax: exception oop 4395 // r8: exception handler 4396 // rdx: exception pc 4397 // Jump to handler 4398 4399 __ jmp(r8); 4400 4401 // Make sure all code is generated 4402 masm->flush(); 4403 4404 // Set exception blob 4405 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1); 4406 } 4407 #endif // COMPILER2