--- /dev/null 2021-01-19 17:38:25.908523431 +0000 +++ new/src/cpu/aarch64/vm/sharedRuntime_aarch64.cpp 2021-01-25 19:31:56.678686073 +0000 @@ -0,0 +1,3004 @@ +/* + * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2013, Red Hat Inc. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "asm/macroAssembler.hpp" +#include "asm/macroAssembler.inline.hpp" +#include "code/debugInfoRec.hpp" +#include "code/icBuffer.hpp" +#include "code/vtableStubs.hpp" +#include "interpreter/interpreter.hpp" +#include "oops/compiledICHolder.hpp" +#include "prims/jvmtiRedefineClassesTrace.hpp" +#include "runtime/sharedRuntime.hpp" +#include "runtime/vframeArray.hpp" +#include "vmreg_aarch64.inline.hpp" +#ifdef COMPILER1 +#include "c1/c1_Runtime1.hpp" +#endif +#ifdef COMPILER2 +#include "opto/runtime.hpp" +#endif + +#define __ masm-> + +const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size; + +class SimpleRuntimeFrame { + + public: + + // Most of the runtime stubs have this simple frame layout. + // This class exists to make the layout shared in one place. + // Offsets are for compiler stack slots, which are jints. + enum layout { + // The frame sender code expects that rbp will be in the "natural" place and + // will override any oopMap setting for it. We must therefore force the layout + // so that it agrees with the frame sender code. + // we don't expect any arg reg save area so aarch64 asserts that + // frame::arg_reg_save_area_bytes == 0 + rbp_off = 0, + rbp_off2, + return_off, return_off2, + framesize + }; +}; + +// FIXME -- this is used by C1 +class RegisterSaver { + public: + static OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors = false); + static void restore_live_registers(MacroAssembler* masm, bool restore_vectors = false); + + // Offsets into the register save area + // Used by deoptimization when it is managing result register + // values on its own + + static int r0_offset_in_bytes(void) { return (32 + r0->encoding()) * wordSize; } + static int reg_offset_in_bytes(Register r) { return r0_offset_in_bytes() + r->encoding() * wordSize; } + static int rmethod_offset_in_bytes(void) { return reg_offset_in_bytes(rmethod); } + static int rscratch1_offset_in_bytes(void) { return (32 + rscratch1->encoding()) * wordSize; } + static int v0_offset_in_bytes(void) { return 0; } + static int return_offset_in_bytes(void) { return (32 /* floats*/ + 31 /* gregs*/) * wordSize; } + + // During deoptimization only the result registers need to be restored, + // all the other values have already been extracted. + static void restore_result_registers(MacroAssembler* masm); + + // Capture info about frame layout + enum layout { + fpu_state_off = 0, + fpu_state_end = fpu_state_off+FPUStateSizeInWords-1, + // The frame sender code expects that rfp will be in + // the "natural" place and will override any oopMap + // setting for it. We must therefore force the layout + // so that it agrees with the frame sender code. + r0_off = fpu_state_off+FPUStateSizeInWords, + rfp_off = r0_off + 30 * 2, + return_off = rfp_off + 2, // slot for return address + reg_save_size = return_off + 2}; + +}; + +OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors) { +#ifdef COMPILER2 + if (save_vectors) { + // Save upper half of vector registers + int vect_words = 32 * 8 / wordSize; + additional_frame_words += vect_words; + } +#else + assert(!save_vectors, "vectors are generated only by C2"); +#endif + + int frame_size_in_bytes = round_to(additional_frame_words*wordSize + + reg_save_size*BytesPerInt, 16); + // OopMap frame size is in compiler stack slots (jint's) not bytes or words + int frame_size_in_slots = frame_size_in_bytes / BytesPerInt; + // The caller will allocate additional_frame_words + int additional_frame_slots = additional_frame_words*wordSize / BytesPerInt; + // CodeBlob frame size is in words. + int frame_size_in_words = frame_size_in_bytes / wordSize; + *total_frame_words = frame_size_in_words; + + // Save Integer and Float registers. + + __ enter(); + __ push_CPU_state(save_vectors); + + // Set an oopmap for the call site. This oopmap will map all + // oop-registers and debug-info registers as callee-saved. This + // will allow deoptimization at this safepoint to find all possible + // debug-info recordings, as well as let GC find all oops. + + OopMapSet *oop_maps = new OopMapSet(); + OopMap* oop_map = new OopMap(frame_size_in_slots, 0); + + for (int i = 0; i < RegisterImpl::number_of_registers; i++) { + Register r = as_Register(i); + if (r < rheapbase && r != rscratch1 && r != rscratch2) { + int sp_offset = 2 * (i + 32); // SP offsets are in 4-byte words, + // register slots are 8 bytes + // wide, 32 floating-point + // registers + oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset + additional_frame_slots), + r->as_VMReg()); + } + } + + for (int i = 0; i < FloatRegisterImpl::number_of_registers; i++) { + FloatRegister r = as_FloatRegister(i); + int sp_offset = save_vectors ? (4 * i) : (2 * i); + oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), + r->as_VMReg()); + } + + return oop_map; +} + +void RegisterSaver::restore_live_registers(MacroAssembler* masm, bool restore_vectors) { +#ifndef COMPILER2 + assert(!restore_vectors, "vectors are generated only by C2"); +#endif + __ pop_CPU_state(restore_vectors); + __ leave(); +} + +void RegisterSaver::restore_result_registers(MacroAssembler* masm) { + + // Just restore result register. Only used by deoptimization. By + // now any callee save register that needs to be restored to a c2 + // caller of the deoptee has been extracted into the vframeArray + // and will be stuffed into the c2i adapter we create for later + // restoration so only result registers need to be restored here. + + // Restore fp result register + __ ldrd(v0, Address(sp, v0_offset_in_bytes())); + // Restore integer result register + __ ldr(r0, Address(sp, r0_offset_in_bytes())); + + // Pop all of the register save are off the stack + __ add(sp, sp, round_to(return_offset_in_bytes(), 16)); +} + +// Is vector's size (in bytes) bigger than a size saved by default? +// 8 bytes vector registers are saved by default on AArch64. +bool SharedRuntime::is_wide_vector(int size) { + return size > 8; +} +// The java_calling_convention describes stack locations as ideal slots on +// a frame with no abi restrictions. Since we must observe abi restrictions +// (like the placement of the register window) the slots must be biased by +// the following value. +static int reg2offset_in(VMReg r) { + // Account for saved rfp and lr + // This should really be in_preserve_stack_slots + return (r->reg2stack() + 4) * VMRegImpl::stack_slot_size; +} + +static int reg2offset_out(VMReg r) { + return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size; +} + +// --------------------------------------------------------------------------- +// Read the array of BasicTypes from a signature, and compute where the +// arguments should go. Values in the VMRegPair regs array refer to 4-byte +// quantities. Values less than VMRegImpl::stack0 are registers, those above +// refer to 4-byte stack slots. All stack slots are based off of the stack pointer +// as framesizes are fixed. +// VMRegImpl::stack0 refers to the first slot 0(sp). +// and VMRegImpl::stack0+1 refers to the memory word 4-byes higher. Register +// up to RegisterImpl::number_of_registers) are the 64-bit +// integer registers. + +// Note: the INPUTS in sig_bt are in units of Java argument words, +// which are 64-bit. The OUTPUTS are in 32-bit units. + +// The Java calling convention is a "shifted" version of the C ABI. +// By skipping the first C ABI register we can call non-static jni +// methods with small numbers of arguments without having to shuffle +// the arguments at all. Since we control the java ABI we ought to at +// least get some advantage out of it. + +int SharedRuntime::java_calling_convention(const BasicType *sig_bt, + VMRegPair *regs, + int total_args_passed, + int is_outgoing) { + + // Create the mapping between argument positions and + // registers. + static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = { + j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7 + }; + static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = { + j_farg0, j_farg1, j_farg2, j_farg3, + j_farg4, j_farg5, j_farg6, j_farg7 + }; + + + uint int_args = 0; + uint fp_args = 0; + uint stk_args = 0; // inc by 2 each time + + for (int i = 0; i < total_args_passed; i++) { + switch (sig_bt[i]) { + case T_BOOLEAN: + case T_CHAR: + case T_BYTE: + case T_SHORT: + case T_INT: + if (int_args < Argument::n_int_register_parameters_j) { + regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); + } else { + regs[i].set1(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + case T_VOID: + // halves of T_LONG or T_DOUBLE + assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); + regs[i].set_bad(); + break; + case T_LONG: + assert(sig_bt[i + 1] == T_VOID, "expecting half"); + // fall through + case T_OBJECT: + case T_ARRAY: + case T_ADDRESS: + if (int_args < Argument::n_int_register_parameters_j) { + regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); + } else { + regs[i].set2(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + case T_FLOAT: + if (fp_args < Argument::n_float_register_parameters_j) { + regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); + } else { + regs[i].set1(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + case T_DOUBLE: + assert(sig_bt[i + 1] == T_VOID, "expecting half"); + if (fp_args < Argument::n_float_register_parameters_j) { + regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); + } else { + regs[i].set2(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + default: + ShouldNotReachHere(); + break; + } + } + + return round_to(stk_args, 2); +} + +// Patch the callers callsite with entry to compiled code if it exists. +static void patch_callers_callsite(MacroAssembler *masm) { + Label L; + __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset()))); + __ cbz(rscratch1, L); + + __ enter(); + __ push_CPU_state(); + + // VM needs caller's callsite + // VM needs target method + // This needs to be a long call since we will relocate this adapter to + // the codeBuffer and it may not reach + +#ifndef PRODUCT + assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); +#endif + + __ mov(c_rarg0, rmethod); + __ mov(c_rarg1, lr); + __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite))); + __ blr(rscratch1); + __ maybe_isb(); + + __ pop_CPU_state(); + // restore sp + __ leave(); + __ bind(L); +} + +static void gen_c2i_adapter(MacroAssembler *masm, + int total_args_passed, + int comp_args_on_stack, + const BasicType *sig_bt, + const VMRegPair *regs, + Label& skip_fixup) { + // Before we get into the guts of the C2I adapter, see if we should be here + // at all. We've come from compiled code and are attempting to jump to the + // interpreter, which means the caller made a static call to get here + // (vcalls always get a compiled target if there is one). Check for a + // compiled target. If there is one, we need to patch the caller's call. + patch_callers_callsite(masm); + + __ bind(skip_fixup); + + int words_pushed = 0; + + // Since all args are passed on the stack, total_args_passed * + // Interpreter::stackElementSize is the space we need. + + int extraspace = total_args_passed * Interpreter::stackElementSize; + + __ mov(r13, sp); + + // stack is aligned, keep it that way + extraspace = round_to(extraspace, 2*wordSize); + + if (extraspace) + __ sub(sp, sp, extraspace); + + // Now write the args into the outgoing interpreter space + for (int i = 0; i < total_args_passed; i++) { + if (sig_bt[i] == T_VOID) { + assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); + continue; + } + + // offset to start parameters + int st_off = (total_args_passed - i - 1) * Interpreter::stackElementSize; + int next_off = st_off - Interpreter::stackElementSize; + + // Say 4 args: + // i st_off + // 0 32 T_LONG + // 1 24 T_VOID + // 2 16 T_OBJECT + // 3 8 T_BOOL + // - 0 return address + // + // However to make thing extra confusing. Because we can fit a long/double in + // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter + // leaves one slot empty and only stores to a single slot. In this case the + // slot that is occupied is the T_VOID slot. See I said it was confusing. + + VMReg r_1 = regs[i].first(); + VMReg r_2 = regs[i].second(); + if (!r_1->is_valid()) { + assert(!r_2->is_valid(), ""); + continue; + } + if (r_1->is_stack()) { + // memory to memory use rscratch1 + int ld_off = (r_1->reg2stack() * VMRegImpl::stack_slot_size + + extraspace + + words_pushed * wordSize); + if (!r_2->is_valid()) { + // sign extend?? + __ ldrw(rscratch1, Address(sp, ld_off)); + __ str(rscratch1, Address(sp, st_off)); + + } else { + + __ ldr(rscratch1, Address(sp, ld_off)); + + // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG + // T_DOUBLE and T_LONG use two slots in the interpreter + if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { + // ld_off == LSW, ld_off+wordSize == MSW + // st_off == MSW, next_off == LSW + __ str(rscratch1, Address(sp, next_off)); +#ifdef ASSERT + // Overwrite the unused slot with known junk + __ mov(rscratch1, 0xdeadffffdeadaaaaul); + __ str(rscratch1, Address(sp, st_off)); +#endif /* ASSERT */ + } else { + __ str(rscratch1, Address(sp, st_off)); + } + } + } else if (r_1->is_Register()) { + Register r = r_1->as_Register(); + if (!r_2->is_valid()) { + // must be only an int (or less ) so move only 32bits to slot + // why not sign extend?? + __ str(r, Address(sp, st_off)); + } else { + // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG + // T_DOUBLE and T_LONG use two slots in the interpreter + if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { + // long/double in gpr +#ifdef ASSERT + // Overwrite the unused slot with known junk + __ mov(rscratch1, 0xdeadffffdeadaaabul); + __ str(rscratch1, Address(sp, st_off)); +#endif /* ASSERT */ + __ str(r, Address(sp, next_off)); + } else { + __ str(r, Address(sp, st_off)); + } + } + } else { + assert(r_1->is_FloatRegister(), ""); + if (!r_2->is_valid()) { + // only a float use just part of the slot + __ strs(r_1->as_FloatRegister(), Address(sp, st_off)); + } else { +#ifdef ASSERT + // Overwrite the unused slot with known junk + __ mov(rscratch1, 0xdeadffffdeadaaacul); + __ str(rscratch1, Address(sp, st_off)); +#endif /* ASSERT */ + __ strd(r_1->as_FloatRegister(), Address(sp, next_off)); + } + } + } + + __ mov(esp, sp); // Interp expects args on caller's expression stack + + __ ldr(rscratch1, Address(rmethod, in_bytes(Method::interpreter_entry_offset()))); + __ br(rscratch1); +} + + +static void gen_i2c_adapter(MacroAssembler *masm, + int total_args_passed, + int comp_args_on_stack, + const BasicType *sig_bt, + const VMRegPair *regs) { + + // Note: r13 contains the senderSP on entry. We must preserve it since + // we may do a i2c -> c2i transition if we lose a race where compiled + // code goes non-entrant while we get args ready. + + // In addition we use r13 to locate all the interpreter args because + // we must align the stack to 16 bytes. + + // Adapters are frameless. + + // An i2c adapter is frameless because the *caller* frame, which is + // interpreted, routinely repairs its own esp (from + // interpreter_frame_last_sp), even if a callee has modified the + // stack pointer. It also recalculates and aligns sp. + + // A c2i adapter is frameless because the *callee* frame, which is + // interpreted, routinely repairs its caller's sp (from sender_sp, + // which is set up via the senderSP register). + + // In other words, if *either* the caller or callee is interpreted, we can + // get the stack pointer repaired after a call. + + // This is why c2i and i2c adapters cannot be indefinitely composed. + // In particular, if a c2i adapter were to somehow call an i2c adapter, + // both caller and callee would be compiled methods, and neither would + // clean up the stack pointer changes performed by the two adapters. + // If this happens, control eventually transfers back to the compiled + // caller, but with an uncorrected stack, causing delayed havoc. + + if (VerifyAdapterCalls && + (Interpreter::code() != NULL || StubRoutines::code1() != NULL)) { +#if 0 + // So, let's test for cascading c2i/i2c adapters right now. + // assert(Interpreter::contains($return_addr) || + // StubRoutines::contains($return_addr), + // "i2c adapter must return to an interpreter frame"); + __ block_comment("verify_i2c { "); + Label L_ok; + if (Interpreter::code() != NULL) + range_check(masm, rax, r11, + Interpreter::code()->code_start(), Interpreter::code()->code_end(), + L_ok); + if (StubRoutines::code1() != NULL) + range_check(masm, rax, r11, + StubRoutines::code1()->code_begin(), StubRoutines::code1()->code_end(), + L_ok); + if (StubRoutines::code2() != NULL) + range_check(masm, rax, r11, + StubRoutines::code2()->code_begin(), StubRoutines::code2()->code_end(), + L_ok); + const char* msg = "i2c adapter must return to an interpreter frame"; + __ block_comment(msg); + __ stop(msg); + __ bind(L_ok); + __ block_comment("} verify_i2ce "); +#endif + } + + // Cut-out for having no stack args. + int comp_words_on_stack = round_to(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord; + if (comp_args_on_stack) { + __ sub(rscratch1, sp, comp_words_on_stack * wordSize); + __ andr(sp, rscratch1, -16); + } + + // Will jump to the compiled code just as if compiled code was doing it. + // Pre-load the register-jump target early, to schedule it better. + __ ldr(rscratch1, Address(rmethod, in_bytes(Method::from_compiled_offset()))); + + // Now generate the shuffle code. + for (int i = 0; i < total_args_passed; i++) { + if (sig_bt[i] == T_VOID) { + assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); + continue; + } + + // Pick up 0, 1 or 2 words from SP+offset. + + assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(), + "scrambled load targets?"); + // Load in argument order going down. + int ld_off = (total_args_passed - i - 1)*Interpreter::stackElementSize; + // Point to interpreter value (vs. tag) + int next_off = ld_off - Interpreter::stackElementSize; + // + // + // + VMReg r_1 = regs[i].first(); + VMReg r_2 = regs[i].second(); + if (!r_1->is_valid()) { + assert(!r_2->is_valid(), ""); + continue; + } + if (r_1->is_stack()) { + // Convert stack slot to an SP offset (+ wordSize to account for return address ) + int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size; + if (!r_2->is_valid()) { + // sign extend??? + __ ldrsw(rscratch2, Address(esp, ld_off)); + __ str(rscratch2, Address(sp, st_off)); + } else { + // + // We are using two optoregs. This can be either T_OBJECT, + // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates + // two slots but only uses one for thr T_LONG or T_DOUBLE case + // So we must adjust where to pick up the data to match the + // interpreter. + // + // Interpreter local[n] == MSW, local[n+1] == LSW however locals + // are accessed as negative so LSW is at LOW address + + // ld_off is MSW so get LSW + const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? + next_off : ld_off; + __ ldr(rscratch2, Address(esp, offset)); + // st_off is LSW (i.e. reg.first()) + __ str(rscratch2, Address(sp, st_off)); + } + } else if (r_1->is_Register()) { // Register argument + Register r = r_1->as_Register(); + if (r_2->is_valid()) { + // + // We are using two VMRegs. This can be either T_OBJECT, + // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates + // two slots but only uses one for thr T_LONG or T_DOUBLE case + // So we must adjust where to pick up the data to match the + // interpreter. + + const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? + next_off : ld_off; + + // this can be a misaligned move + __ ldr(r, Address(esp, offset)); + } else { + // sign extend and use a full word? + __ ldrw(r, Address(esp, ld_off)); + } + } else { + if (!r_2->is_valid()) { + __ ldrs(r_1->as_FloatRegister(), Address(esp, ld_off)); + } else { + __ ldrd(r_1->as_FloatRegister(), Address(esp, next_off)); + } + } + } + + // 6243940 We might end up in handle_wrong_method if + // the callee is deoptimized as we race thru here. If that + // happens we don't want to take a safepoint because the + // caller frame will look interpreted and arguments are now + // "compiled" so it is much better to make this transition + // invisible to the stack walking code. Unfortunately if + // we try and find the callee by normal means a safepoint + // is possible. So we stash the desired callee in the thread + // and the vm will find there should this case occur. + + __ str(rmethod, Address(rthread, JavaThread::callee_target_offset())); + + __ br(rscratch1); +} + +// --------------------------------------------------------------- +AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm, + int total_args_passed, + int comp_args_on_stack, + const BasicType *sig_bt, + const VMRegPair *regs, + AdapterFingerPrint* fingerprint) { + address i2c_entry = __ pc(); + + gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs); + + address c2i_unverified_entry = __ pc(); + Label skip_fixup; + + Label ok; + + Register holder = rscratch2; + Register receiver = j_rarg0; + Register tmp = r10; // A call-clobbered register not used for arg passing + + // ------------------------------------------------------------------------- + // Generate a C2I adapter. On entry we know rmethod holds the Method* during calls + // to the interpreter. The args start out packed in the compiled layout. They + // need to be unpacked into the interpreter layout. This will almost always + // require some stack space. We grow the current (compiled) stack, then repack + // the args. We finally end in a jump to the generic interpreter entry point. + // On exit from the interpreter, the interpreter will restore our SP (lest the + // compiled code, which relys solely on SP and not FP, get sick). + + { + __ block_comment("c2i_unverified_entry {"); + __ load_klass(rscratch1, receiver); + __ ldr(tmp, Address(holder, CompiledICHolder::holder_klass_offset())); + __ cmp(rscratch1, tmp); + __ ldr(rmethod, Address(holder, CompiledICHolder::holder_metadata_offset())); + __ br(Assembler::EQ, ok); + __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); + + __ bind(ok); + // Method might have been compiled since the call site was patched to + // interpreted; if that is the case treat it as a miss so we can get + // the call site corrected. + __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset()))); + __ cbz(rscratch1, skip_fixup); + __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); + __ block_comment("} c2i_unverified_entry"); + } + + address c2i_entry = __ pc(); + + gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup); + + __ flush(); + return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry); +} + +int SharedRuntime::c_calling_convention(const BasicType *sig_bt, + VMRegPair *regs, + VMRegPair *regs2, + int total_args_passed) { + assert(regs2 == NULL, "not needed on AArch64"); +// We return the amount of VMRegImpl stack slots we need to reserve for all +// the arguments NOT counting out_preserve_stack_slots. + + static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = { + c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5, c_rarg6, c_rarg7 + }; + static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = { + c_farg0, c_farg1, c_farg2, c_farg3, + c_farg4, c_farg5, c_farg6, c_farg7 + }; + + uint int_args = 0; + uint fp_args = 0; + uint stk_args = 0; // inc by 2 each time + + for (int i = 0; i < total_args_passed; i++) { + switch (sig_bt[i]) { + case T_BOOLEAN: + case T_CHAR: + case T_BYTE: + case T_SHORT: + case T_INT: + if (int_args < Argument::n_int_register_parameters_c) { + regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); +#ifdef _WIN64 + fp_args++; + // Allocate slots for callee to stuff register args the stack. + stk_args += 2; +#endif + } else { + regs[i].set1(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + case T_LONG: + assert(sig_bt[i + 1] == T_VOID, "expecting half"); + // fall through + case T_OBJECT: + case T_ARRAY: + case T_ADDRESS: + case T_METADATA: + if (int_args < Argument::n_int_register_parameters_c) { + regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); +#ifdef _WIN64 + fp_args++; + stk_args += 2; +#endif + } else { + regs[i].set2(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + case T_FLOAT: + if (fp_args < Argument::n_float_register_parameters_c) { + regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); +#ifdef _WIN64 + int_args++; + // Allocate slots for callee to stuff register args the stack. + stk_args += 2; +#endif + } else { + regs[i].set1(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + case T_DOUBLE: + assert(sig_bt[i + 1] == T_VOID, "expecting half"); + if (fp_args < Argument::n_float_register_parameters_c) { + regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); +#ifdef _WIN64 + int_args++; + // Allocate slots for callee to stuff register args the stack. + stk_args += 2; +#endif + } else { + regs[i].set2(VMRegImpl::stack2reg(stk_args)); + stk_args += 2; + } + break; + case T_VOID: // Halves of longs and doubles + assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); + regs[i].set_bad(); + break; + default: + ShouldNotReachHere(); + break; + } + } +#ifdef _WIN64 + // windows abi requires that we always allocate enough stack space + // for 4 64bit registers to be stored down. + if (stk_args < 8) { + stk_args = 8; + } +#endif // _WIN64 + + return stk_args; +} + +// On 64 bit we will store integer like items to the stack as +// 64 bits items (sparc abi) even though java would only store +// 32bits for a parameter. On 32bit it will simply be 32 bits +// So this routine will do 32->32 on 32bit and 32->64 on 64bit +static void move32_64(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { + if (src.first()->is_stack()) { + if (dst.first()->is_stack()) { + // stack to stack + __ ldr(rscratch1, Address(rfp, reg2offset_in(src.first()))); + __ str(rscratch1, Address(sp, reg2offset_out(dst.first()))); + } else { + // stack to reg + __ ldrsw(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first()))); + } + } else if (dst.first()->is_stack()) { + // reg to stack + // Do we really have to sign extend??? + // __ movslq(src.first()->as_Register(), src.first()->as_Register()); + __ str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first()))); + } else { + if (dst.first() != src.first()) { + __ sxtw(dst.first()->as_Register(), src.first()->as_Register()); + } + } +} + +// An oop arg. Must pass a handle not the oop itself +static void object_move(MacroAssembler* masm, + OopMap* map, + int oop_handle_offset, + int framesize_in_slots, + VMRegPair src, + VMRegPair dst, + bool is_receiver, + int* receiver_offset) { + + // must pass a handle. First figure out the location we use as a handle + + Register rHandle = dst.first()->is_stack() ? rscratch2 : dst.first()->as_Register(); + + // See if oop is NULL if it is we need no handle + + if (src.first()->is_stack()) { + + // Oop is already on the stack as an argument + int offset_in_older_frame = src.first()->reg2stack() + SharedRuntime::out_preserve_stack_slots(); + map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + framesize_in_slots)); + if (is_receiver) { + *receiver_offset = (offset_in_older_frame + framesize_in_slots) * VMRegImpl::stack_slot_size; + } + + __ ldr(rscratch1, Address(rfp, reg2offset_in(src.first()))); + __ lea(rHandle, Address(rfp, reg2offset_in(src.first()))); + // conditionally move a NULL + __ cmp(rscratch1, zr); + __ csel(rHandle, zr, rHandle, Assembler::EQ); + } else { + + // Oop is in an a register we must store it to the space we reserve + // on the stack for oop_handles and pass a handle if oop is non-NULL + + const Register rOop = src.first()->as_Register(); + int oop_slot; + if (rOop == j_rarg0) + oop_slot = 0; + else if (rOop == j_rarg1) + oop_slot = 1; + else if (rOop == j_rarg2) + oop_slot = 2; + else if (rOop == j_rarg3) + oop_slot = 3; + else if (rOop == j_rarg4) + oop_slot = 4; + else if (rOop == j_rarg5) + oop_slot = 5; + else if (rOop == j_rarg6) + oop_slot = 6; + else { + assert(rOop == j_rarg7, "wrong register"); + oop_slot = 7; + } + + oop_slot = oop_slot * VMRegImpl::slots_per_word + oop_handle_offset; + int offset = oop_slot*VMRegImpl::stack_slot_size; + + map->set_oop(VMRegImpl::stack2reg(oop_slot)); + // Store oop in handle area, may be NULL + __ str(rOop, Address(sp, offset)); + if (is_receiver) { + *receiver_offset = offset; + } + + __ cmp(rOop, zr); + __ lea(rHandle, Address(sp, offset)); + // conditionally move a NULL + __ csel(rHandle, zr, rHandle, Assembler::EQ); + } + + // If arg is on the stack then place it otherwise it is already in correct reg. + if (dst.first()->is_stack()) { + __ str(rHandle, Address(sp, reg2offset_out(dst.first()))); + } +} + +// A float arg may have to do float reg int reg conversion +static void float_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { + assert(src.first()->is_stack() && dst.first()->is_stack() || + src.first()->is_reg() && dst.first()->is_reg(), "Unexpected error"); + if (src.first()->is_stack()) { + if (dst.first()->is_stack()) { + __ ldrw(rscratch1, Address(rfp, reg2offset_in(src.first()))); + __ strw(rscratch1, Address(sp, reg2offset_out(dst.first()))); + } else { + ShouldNotReachHere(); + } + } else if (src.first() != dst.first()) { + if (src.is_single_phys_reg() && dst.is_single_phys_reg()) + __ fmovs(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister()); + else + ShouldNotReachHere(); + } +} + +// A long move +static void long_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { + if (src.first()->is_stack()) { + if (dst.first()->is_stack()) { + // stack to stack + __ ldr(rscratch1, Address(rfp, reg2offset_in(src.first()))); + __ str(rscratch1, Address(sp, reg2offset_out(dst.first()))); + } else { + // stack to reg + __ ldr(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first()))); + } + } else if (dst.first()->is_stack()) { + // reg to stack + // Do we really have to sign extend??? + // __ movslq(src.first()->as_Register(), src.first()->as_Register()); + __ str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first()))); + } else { + if (dst.first() != src.first()) { + __ mov(dst.first()->as_Register(), src.first()->as_Register()); + } + } +} + + +// A double move +static void double_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) { + assert(src.first()->is_stack() && dst.first()->is_stack() || + src.first()->is_reg() && dst.first()->is_reg(), "Unexpected error"); + if (src.first()->is_stack()) { + if (dst.first()->is_stack()) { + __ ldr(rscratch1, Address(rfp, reg2offset_in(src.first()))); + __ str(rscratch1, Address(sp, reg2offset_out(dst.first()))); + } else { + ShouldNotReachHere(); + } + } else if (src.first() != dst.first()) { + if (src.is_single_phys_reg() && dst.is_single_phys_reg()) + __ fmovd(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister()); + else + ShouldNotReachHere(); + } +} + + +void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { + // We always ignore the frame_slots arg and just use the space just below frame pointer + // which by this time is free to use + switch (ret_type) { + case T_FLOAT: + __ strs(v0, Address(rfp, -wordSize)); + break; + case T_DOUBLE: + __ strd(v0, Address(rfp, -wordSize)); + break; + case T_VOID: break; + default: { + __ str(r0, Address(rfp, -wordSize)); + } + } +} + +void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { + // We always ignore the frame_slots arg and just use the space just below frame pointer + // which by this time is free to use + switch (ret_type) { + case T_FLOAT: + __ ldrs(v0, Address(rfp, -wordSize)); + break; + case T_DOUBLE: + __ ldrd(v0, Address(rfp, -wordSize)); + break; + case T_VOID: break; + default: { + __ ldr(r0, Address(rfp, -wordSize)); + } + } +} +static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { + RegSet x; + for ( int i = first_arg ; i < arg_count ; i++ ) { + if (args[i].first()->is_Register()) { + x = x + args[i].first()->as_Register(); + } else if (args[i].first()->is_FloatRegister()) { + __ strd(args[i].first()->as_FloatRegister(), Address(__ pre(sp, -2 * wordSize))); + } + } + __ push(x, sp); +} + +static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { + RegSet x; + for ( int i = first_arg ; i < arg_count ; i++ ) { + if (args[i].first()->is_Register()) { + x = x + args[i].first()->as_Register(); + } else { + ; + } + } + __ pop(x, sp); + for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) { + if (args[i].first()->is_Register()) { + ; + } else if (args[i].first()->is_FloatRegister()) { + __ ldrd(args[i].first()->as_FloatRegister(), Address(__ post(sp, 2 * wordSize))); + } + } +} + + +// Check GC_locker::needs_gc and enter the runtime if it's true. This +// keeps a new JNI critical region from starting until a GC has been +// forced. Save down any oops in registers and describe them in an +// OopMap. +static void check_needs_gc_for_critical_native(MacroAssembler* masm, + int stack_slots, + int total_c_args, + int total_in_args, + int arg_save_area, + OopMapSet* oop_maps, + VMRegPair* in_regs, + BasicType* in_sig_bt) { Unimplemented(); } + +// Unpack an array argument into a pointer to the body and the length +// if the array is non-null, otherwise pass 0 for both. +static void unpack_array_argument(MacroAssembler* masm, VMRegPair reg, BasicType in_elem_type, VMRegPair body_arg, VMRegPair length_arg) { Unimplemented(); } + + +class ComputeMoveOrder: public StackObj { + class MoveOperation: public ResourceObj { + friend class ComputeMoveOrder; + private: + VMRegPair _src; + VMRegPair _dst; + int _src_index; + int _dst_index; + bool _processed; + MoveOperation* _next; + MoveOperation* _prev; + + static int get_id(VMRegPair r) { Unimplemented(); return 0; } + + public: + MoveOperation(int src_index, VMRegPair src, int dst_index, VMRegPair dst): + _src(src) + , _src_index(src_index) + , _dst(dst) + , _dst_index(dst_index) + , _next(NULL) + , _prev(NULL) + , _processed(false) { Unimplemented(); } + + VMRegPair src() const { Unimplemented(); return _src; } + int src_id() const { Unimplemented(); return 0; } + int src_index() const { Unimplemented(); return 0; } + VMRegPair dst() const { Unimplemented(); return _src; } + void set_dst(int i, VMRegPair dst) { Unimplemented(); } + int dst_index() const { Unimplemented(); return 0; } + int dst_id() const { Unimplemented(); return 0; } + MoveOperation* next() const { Unimplemented(); return 0; } + MoveOperation* prev() const { Unimplemented(); return 0; } + void set_processed() { Unimplemented(); } + bool is_processed() const { Unimplemented(); return 0; } + + // insert + void break_cycle(VMRegPair temp_register) { Unimplemented(); } + + void link(GrowableArray& killer) { Unimplemented(); } + }; + + private: + GrowableArray edges; + + public: + ComputeMoveOrder(int total_in_args, VMRegPair* in_regs, int total_c_args, VMRegPair* out_regs, + BasicType* in_sig_bt, GrowableArray& arg_order, VMRegPair tmp_vmreg) { Unimplemented(); } + + // Collected all the move operations + void add_edge(int src_index, VMRegPair src, int dst_index, VMRegPair dst) { Unimplemented(); } + + // Walk the edges breaking cycles between moves. The result list + // can be walked in order to produce the proper set of loads + GrowableArray* get_store_order(VMRegPair temp_register) { Unimplemented(); return 0; } +}; + + +static void rt_call(MacroAssembler* masm, address dest, int gpargs, int fpargs, int type) { + CodeBlob *cb = CodeCache::find_blob(dest); + if (cb) { + __ far_call(RuntimeAddress(dest)); + } else { + assert((unsigned)gpargs < 256, "eek!"); + assert((unsigned)fpargs < 32, "eek!"); + __ lea(rscratch1, RuntimeAddress(dest)); + __ blr(rscratch1); + __ maybe_isb(); + } +} + +static void verify_oop_args(MacroAssembler* masm, + methodHandle method, + const BasicType* sig_bt, + const VMRegPair* regs) { + Register temp_reg = r19; // not part of any compiled calling seq + if (VerifyOops) { + for (int i = 0; i < method->size_of_parameters(); i++) { + if (sig_bt[i] == T_OBJECT || + sig_bt[i] == T_ARRAY) { + VMReg r = regs[i].first(); + assert(r->is_valid(), "bad oop arg"); + if (r->is_stack()) { + __ ldr(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); + __ verify_oop(temp_reg); + } else { + __ verify_oop(r->as_Register()); + } + } + } + } +} + +static void gen_special_dispatch(MacroAssembler* masm, + methodHandle method, + const BasicType* sig_bt, + const VMRegPair* regs) { + verify_oop_args(masm, method, sig_bt, regs); + vmIntrinsics::ID iid = method->intrinsic_id(); + + // Now write the args into the outgoing interpreter space + bool has_receiver = false; + Register receiver_reg = noreg; + int member_arg_pos = -1; + Register member_reg = noreg; + int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid); + if (ref_kind != 0) { + member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument + member_reg = r19; // known to be free at this point + has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind); + } else if (iid == vmIntrinsics::_invokeBasic) { + has_receiver = true; + } else { + fatal(err_msg_res("unexpected intrinsic id %d", iid)); + } + + if (member_reg != noreg) { + // Load the member_arg into register, if necessary. + SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs); + VMReg r = regs[member_arg_pos].first(); + if (r->is_stack()) { + __ ldr(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); + } else { + // no data motion is needed + member_reg = r->as_Register(); + } + } + + if (has_receiver) { + // Make sure the receiver is loaded into a register. + assert(method->size_of_parameters() > 0, "oob"); + assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object"); + VMReg r = regs[0].first(); + assert(r->is_valid(), "bad receiver arg"); + if (r->is_stack()) { + // Porting note: This assumes that compiled calling conventions always + // pass the receiver oop in a register. If this is not true on some + // platform, pick a temp and load the receiver from stack. + fatal("receiver always in a register"); + receiver_reg = r2; // known to be free at this point + __ ldr(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); + } else { + // no data motion is needed + receiver_reg = r->as_Register(); + } + } + + // Figure out which address we are really jumping to: + MethodHandles::generate_method_handle_dispatch(masm, iid, + receiver_reg, member_reg, /*for_compiler_entry:*/ true); +} + +// --------------------------------------------------------------------------- +// Generate a native wrapper for a given method. The method takes arguments +// in the Java compiled code convention, marshals them to the native +// convention (handlizes oops, etc), transitions to native, makes the call, +// returns to java state (possibly blocking), unhandlizes any result and +// returns. +// +// Critical native functions are a shorthand for the use of +// GetPrimtiveArrayCritical and disallow the use of any other JNI +// functions. The wrapper is expected to unpack the arguments before +// passing them to the callee and perform checks before and after the +// native call to ensure that they GC_locker +// lock_critical/unlock_critical semantics are followed. Some other +// parts of JNI setup are skipped like the tear down of the JNI handle +// block and the check for pending exceptions it's impossible for them +// to be thrown. +// +// They are roughly structured like this: +// if (GC_locker::needs_gc()) +// SharedRuntime::block_for_jni_critical(); +// tranistion to thread_in_native +// unpack arrray arguments and call native entry point +// check for safepoint in progress +// check if any thread suspend flags are set +// call into JVM and possible unlock the JNI critical +// if a GC was suppressed while in the critical native. +// transition back to thread_in_Java +// return to caller +// +nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm, + methodHandle method, + int compile_id, + BasicType* in_sig_bt, + VMRegPair* in_regs, + BasicType ret_type) { + if (method->is_method_handle_intrinsic()) { + vmIntrinsics::ID iid = method->intrinsic_id(); + intptr_t start = (intptr_t)__ pc(); + int vep_offset = ((intptr_t)__ pc()) - start; + + // First instruction must be a nop as it may need to be patched on deoptimisation + __ nop(); + gen_special_dispatch(masm, + method, + in_sig_bt, + in_regs); + int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period + __ flush(); + int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually + return nmethod::new_native_nmethod(method, + compile_id, + masm->code(), + vep_offset, + frame_complete, + stack_slots / VMRegImpl::slots_per_word, + in_ByteSize(-1), + in_ByteSize(-1), + (OopMapSet*)NULL); + } + bool is_critical_native = true; + address native_func = method->critical_native_function(); + if (native_func == NULL) { + native_func = method->native_function(); + is_critical_native = false; + } + assert(native_func != NULL, "must have function"); + + // An OopMap for lock (and class if static) + OopMapSet *oop_maps = new OopMapSet(); + intptr_t start = (intptr_t)__ pc(); + + // We have received a description of where all the java arg are located + // on entry to the wrapper. We need to convert these args to where + // the jni function will expect them. To figure out where they go + // we convert the java signature to a C signature by inserting + // the hidden arguments as arg[0] and possibly arg[1] (static method) + + const int total_in_args = method->size_of_parameters(); + int total_c_args = total_in_args; + if (!is_critical_native) { + total_c_args += 1; + if (method->is_static()) { + total_c_args++; + } + } else { + for (int i = 0; i < total_in_args; i++) { + if (in_sig_bt[i] == T_ARRAY) { + total_c_args++; + } + } + } + + BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args); + VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args); + BasicType* in_elem_bt = NULL; + + int argc = 0; + if (!is_critical_native) { + out_sig_bt[argc++] = T_ADDRESS; + if (method->is_static()) { + out_sig_bt[argc++] = T_OBJECT; + } + + for (int i = 0; i < total_in_args ; i++ ) { + out_sig_bt[argc++] = in_sig_bt[i]; + } + } else { + Thread* THREAD = Thread::current(); + in_elem_bt = NEW_RESOURCE_ARRAY(BasicType, total_in_args); + SignatureStream ss(method->signature()); + for (int i = 0; i < total_in_args ; i++ ) { + if (in_sig_bt[i] == T_ARRAY) { + // Arrays are passed as int, elem* pair + out_sig_bt[argc++] = T_INT; + out_sig_bt[argc++] = T_ADDRESS; + Symbol* atype = ss.as_symbol(CHECK_NULL); + const char* at = atype->as_C_string(); + if (strlen(at) == 2) { + assert(at[0] == '[', "must be"); + switch (at[1]) { + case 'B': in_elem_bt[i] = T_BYTE; break; + case 'C': in_elem_bt[i] = T_CHAR; break; + case 'D': in_elem_bt[i] = T_DOUBLE; break; + case 'F': in_elem_bt[i] = T_FLOAT; break; + case 'I': in_elem_bt[i] = T_INT; break; + case 'J': in_elem_bt[i] = T_LONG; break; + case 'S': in_elem_bt[i] = T_SHORT; break; + case 'Z': in_elem_bt[i] = T_BOOLEAN; break; + default: ShouldNotReachHere(); + } + } + } else { + out_sig_bt[argc++] = in_sig_bt[i]; + in_elem_bt[i] = T_VOID; + } + if (in_sig_bt[i] != T_VOID) { + assert(in_sig_bt[i] == ss.type(), "must match"); + ss.next(); + } + } + } + + // Now figure out where the args must be stored and how much stack space + // they require. + int out_arg_slots; + out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args); + + // Compute framesize for the wrapper. We need to handlize all oops in + // incoming registers + + // Calculate the total number of stack slots we will need. + + // First count the abi requirement plus all of the outgoing args + int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots; + + // Now the space for the inbound oop handle area + int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers + if (is_critical_native) { + // Critical natives may have to call out so they need a save area + // for register arguments. + int double_slots = 0; + int single_slots = 0; + for ( int i = 0; i < total_in_args; i++) { + if (in_regs[i].first()->is_Register()) { + const Register reg = in_regs[i].first()->as_Register(); + switch (in_sig_bt[i]) { + case T_BOOLEAN: + case T_BYTE: + case T_SHORT: + case T_CHAR: + case T_INT: single_slots++; break; + case T_ARRAY: // specific to LP64 (7145024) + case T_LONG: double_slots++; break; + default: ShouldNotReachHere(); + } + } else if (in_regs[i].first()->is_FloatRegister()) { + ShouldNotReachHere(); + } + } + total_save_slots = double_slots * 2 + single_slots; + // align the save area + if (double_slots != 0) { + stack_slots = round_to(stack_slots, 2); + } + } + + int oop_handle_offset = stack_slots; + stack_slots += total_save_slots; + + // Now any space we need for handlizing a klass if static method + + int klass_slot_offset = 0; + int klass_offset = -1; + int lock_slot_offset = 0; + bool is_static = false; + + if (method->is_static()) { + klass_slot_offset = stack_slots; + stack_slots += VMRegImpl::slots_per_word; + klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size; + is_static = true; + } + + // Plus a lock if needed + + if (method->is_synchronized()) { + lock_slot_offset = stack_slots; + stack_slots += VMRegImpl::slots_per_word; + } + + // Now a place (+2) to save return values or temp during shuffling + // + 4 for return address (which we own) and saved rfp + stack_slots += 6; + + // Ok The space we have allocated will look like: + // + // + // FP-> | | + // |---------------------| + // | 2 slots for moves | + // |---------------------| + // | lock box (if sync) | + // |---------------------| <- lock_slot_offset + // | klass (if static) | + // |---------------------| <- klass_slot_offset + // | oopHandle area | + // |---------------------| <- oop_handle_offset (8 java arg registers) + // | outbound memory | + // | based arguments | + // | | + // |---------------------| + // | | + // SP-> | out_preserved_slots | + // + // + + + // Now compute actual number of stack words we need rounding to make + // stack properly aligned. + stack_slots = round_to(stack_slots, StackAlignmentInSlots); + + int stack_size = stack_slots * VMRegImpl::stack_slot_size; + + // First thing make an ic check to see if we should even be here + + // We are free to use all registers as temps without saving them and + // restoring them except rfp. rfp is the only callee save register + // as far as the interpreter and the compiler(s) are concerned. + + + const Register ic_reg = rscratch2; + const Register receiver = j_rarg0; + + Label hit; + Label exception_pending; + + assert_different_registers(ic_reg, receiver, rscratch1); + __ verify_oop(receiver); + __ cmp_klass(receiver, ic_reg, rscratch1); + __ br(Assembler::EQ, hit); + + __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); + + // Verified entry point must be aligned + __ align(8); + + __ bind(hit); + + int vep_offset = ((intptr_t)__ pc()) - start; + + // If we have to make this method not-entrant we'll overwrite its + // first instruction with a jump. For this action to be legal we + // must ensure that this first instruction is a B, BL, NOP, BKPT, + // SVC, HVC, or SMC. Make it a NOP. + __ nop(); + + // Generate stack overflow check + if (UseStackBanging) { + __ bang_stack_with_offset(StackShadowPages*os::vm_page_size()); + } else { + Unimplemented(); + } + + // Generate a new frame for the wrapper. + __ enter(); + // -2 because return address is already present and so is saved rfp + __ sub(sp, sp, stack_size - 2*wordSize); + + // Frame is now completed as far as size and linkage. + int frame_complete = ((intptr_t)__ pc()) - start; + + // We use r20 as the oop handle for the receiver/klass + // It is callee save so it survives the call to native + + const Register oop_handle_reg = r20; + + if (is_critical_native) { + check_needs_gc_for_critical_native(masm, stack_slots, total_c_args, total_in_args, + oop_handle_offset, oop_maps, in_regs, in_sig_bt); + } + + // + // We immediately shuffle the arguments so that any vm call we have to + // make from here on out (sync slow path, jvmti, etc.) we will have + // captured the oops from our caller and have a valid oopMap for + // them. + + // ----------------- + // The Grand Shuffle + + // The Java calling convention is either equal (linux) or denser (win64) than the + // c calling convention. However the because of the jni_env argument the c calling + // convention always has at least one more (and two for static) arguments than Java. + // Therefore if we move the args from java -> c backwards then we will never have + // a register->register conflict and we don't have to build a dependency graph + // and figure out how to break any cycles. + // + + // Record esp-based slot for receiver on stack for non-static methods + int receiver_offset = -1; + + // This is a trick. We double the stack slots so we can claim + // the oops in the caller's frame. Since we are sure to have + // more args than the caller doubling is enough to make + // sure we can capture all the incoming oop args from the + // caller. + // + OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); + + // Mark location of rfp (someday) + // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rfp)); + + + int float_args = 0; + int int_args = 0; + +#ifdef ASSERT + bool reg_destroyed[RegisterImpl::number_of_registers]; + bool freg_destroyed[FloatRegisterImpl::number_of_registers]; + for ( int r = 0 ; r < RegisterImpl::number_of_registers ; r++ ) { + reg_destroyed[r] = false; + } + for ( int f = 0 ; f < FloatRegisterImpl::number_of_registers ; f++ ) { + freg_destroyed[f] = false; + } + +#endif /* ASSERT */ + + // This may iterate in two different directions depending on the + // kind of native it is. The reason is that for regular JNI natives + // the incoming and outgoing registers are offset upwards and for + // critical natives they are offset down. + GrowableArray arg_order(2 * total_in_args); + VMRegPair tmp_vmreg; + tmp_vmreg.set1(r19->as_VMReg()); + + if (!is_critical_native) { + for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) { + arg_order.push(i); + arg_order.push(c_arg); + } + } else { + // Compute a valid move order, using tmp_vmreg to break any cycles + ComputeMoveOrder cmo(total_in_args, in_regs, total_c_args, out_regs, in_sig_bt, arg_order, tmp_vmreg); + } + + int temploc = -1; + for (int ai = 0; ai < arg_order.length(); ai += 2) { + int i = arg_order.at(ai); + int c_arg = arg_order.at(ai + 1); + __ block_comment(err_msg("move %d -> %d", i, c_arg)); + if (c_arg == -1) { + assert(is_critical_native, "should only be required for critical natives"); + // This arg needs to be moved to a temporary + __ mov(tmp_vmreg.first()->as_Register(), in_regs[i].first()->as_Register()); + in_regs[i] = tmp_vmreg; + temploc = i; + continue; + } else if (i == -1) { + assert(is_critical_native, "should only be required for critical natives"); + // Read from the temporary location + assert(temploc != -1, "must be valid"); + i = temploc; + temploc = -1; + } +#ifdef ASSERT + if (in_regs[i].first()->is_Register()) { + assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!"); + } else if (in_regs[i].first()->is_FloatRegister()) { + assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!"); + } + if (out_regs[c_arg].first()->is_Register()) { + reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true; + } else if (out_regs[c_arg].first()->is_FloatRegister()) { + freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true; + } +#endif /* ASSERT */ + switch (in_sig_bt[i]) { + case T_ARRAY: + if (is_critical_native) { + unpack_array_argument(masm, in_regs[i], in_elem_bt[i], out_regs[c_arg + 1], out_regs[c_arg]); + c_arg++; +#ifdef ASSERT + if (out_regs[c_arg].first()->is_Register()) { + reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true; + } else if (out_regs[c_arg].first()->is_FloatRegister()) { + freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true; + } +#endif + int_args++; + break; + } + case T_OBJECT: + assert(!is_critical_native, "no oop arguments"); + object_move(masm, map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg], + ((i == 0) && (!is_static)), + &receiver_offset); + int_args++; + break; + case T_VOID: + break; + + case T_FLOAT: + float_move(masm, in_regs[i], out_regs[c_arg]); + float_args++; + break; + + case T_DOUBLE: + assert( i + 1 < total_in_args && + in_sig_bt[i + 1] == T_VOID && + out_sig_bt[c_arg+1] == T_VOID, "bad arg list"); + double_move(masm, in_regs[i], out_regs[c_arg]); + float_args++; + break; + + case T_LONG : + long_move(masm, in_regs[i], out_regs[c_arg]); + int_args++; + break; + + case T_ADDRESS: assert(false, "found T_ADDRESS in java args"); + + default: + move32_64(masm, in_regs[i], out_regs[c_arg]); + int_args++; + } + } + + // point c_arg at the first arg that is already loaded in case we + // need to spill before we call out + int c_arg = total_c_args - total_in_args; + + // Pre-load a static method's oop into c_rarg1. + if (method->is_static() && !is_critical_native) { + + // load oop into a register + __ movoop(c_rarg1, + JNIHandles::make_local(method->method_holder()->java_mirror()), + /*immediate*/true); + + // Now handlize the static class mirror it's known not-null. + __ str(c_rarg1, Address(sp, klass_offset)); + map->set_oop(VMRegImpl::stack2reg(klass_slot_offset)); + + // Now get the handle + __ lea(c_rarg1, Address(sp, klass_offset)); + // and protect the arg if we must spill + c_arg--; + } + + // Change state to native (we save the return address in the thread, since it might not + // be pushed on the stack when we do a stack traversal). + // We use the same pc/oopMap repeatedly when we call out + + Label native_return; + __ set_last_Java_frame(sp, noreg, native_return, rscratch1); + + Label dtrace_method_entry, dtrace_method_entry_done; + { + unsigned long offset; + __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset); + __ ldrb(rscratch1, Address(rscratch1, offset)); + __ cbnzw(rscratch1, dtrace_method_entry); + __ bind(dtrace_method_entry_done); + } + + // RedefineClasses() tracing support for obsolete method entry + if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) { + // protect the args we've loaded + save_args(masm, total_c_args, c_arg, out_regs); + __ mov_metadata(c_rarg1, method()); + __ call_VM_leaf( + CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), + rthread, c_rarg1); + restore_args(masm, total_c_args, c_arg, out_regs); + } + + // Lock a synchronized method + + // Register definitions used by locking and unlocking + + const Register swap_reg = r0; + const Register obj_reg = r19; // Will contain the oop + const Register lock_reg = r13; // Address of compiler lock object (BasicLock) + const Register old_hdr = r13; // value of old header at unlock time + const Register tmp = lr; + + Label slow_path_lock; + Label lock_done; + + if (method->is_synchronized()) { + assert(!is_critical_native, "unhandled"); + + const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes(); + + // Get the handle (the 2nd argument) + __ mov(oop_handle_reg, c_rarg1); + + // Get address of the box + + __ lea(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); + + // Load the oop from the handle + __ ldr(obj_reg, Address(oop_handle_reg, 0)); + + if (UseBiasedLocking) { + __ biased_locking_enter(lock_reg, obj_reg, swap_reg, tmp, false, lock_done, &slow_path_lock); + } + + // Load (object->mark() | 1) into swap_reg %r0 + __ ldr(rscratch1, Address(obj_reg, 0)); + __ orr(swap_reg, rscratch1, 1); + + // Save (object->mark() | 1) into BasicLock's displaced header + __ str(swap_reg, Address(lock_reg, mark_word_offset)); + + // src -> dest iff dest == r0 else r0 <- dest + { Label here; + __ cmpxchgptr(r0, lock_reg, obj_reg, rscratch1, lock_done, /*fallthrough*/NULL); + } + + // Hmm should this move to the slow path code area??? + + // Test if the oopMark is an obvious stack pointer, i.e., + // 1) (mark & 3) == 0, and + // 2) sp <= mark < mark + os::pagesize() + // These 3 tests can be done by evaluating the following + // expression: ((mark - sp) & (3 - os::vm_page_size())), + // assuming both stack pointer and pagesize have their + // least significant 2 bits clear. + // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg + + __ sub(swap_reg, sp, swap_reg); + __ neg(swap_reg, swap_reg); + __ ands(swap_reg, swap_reg, 3 - os::vm_page_size()); + + // Save the test result, for recursive case, the result is zero + __ str(swap_reg, Address(lock_reg, mark_word_offset)); + __ br(Assembler::NE, slow_path_lock); + + // Slow path will re-enter here + + __ bind(lock_done); + } + + + // Finally just about ready to make the JNI call + + // get JNIEnv* which is first argument to native + if (!is_critical_native) { + __ lea(c_rarg0, Address(rthread, in_bytes(JavaThread::jni_environment_offset()))); + } + + // Now set thread in native + __ mov(rscratch1, _thread_in_native); + __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); + __ stlrw(rscratch1, rscratch2); + + { + int return_type = 0; + switch (ret_type) { + case T_VOID: break; + return_type = 0; break; + case T_CHAR: + case T_BYTE: + case T_SHORT: + case T_INT: + case T_BOOLEAN: + case T_LONG: + return_type = 1; break; + case T_ARRAY: + case T_OBJECT: + return_type = 1; break; + case T_FLOAT: + return_type = 2; break; + case T_DOUBLE: + return_type = 3; break; + default: + ShouldNotReachHere(); + } + rt_call(masm, native_func, + int_args + 2, // AArch64 passes up to 8 args in int registers + float_args, // and up to 8 float args + return_type); + } + + __ bind(native_return); + + intptr_t return_pc = (intptr_t) __ pc(); + oop_maps->add_gc_map(return_pc - start, map); + + // Unpack native results. + switch (ret_type) { + case T_BOOLEAN: __ c2bool(r0); break; + case T_CHAR : __ ubfx(r0, r0, 0, 16); break; + case T_BYTE : __ sbfx(r0, r0, 0, 8); break; + case T_SHORT : __ sbfx(r0, r0, 0, 16); break; + case T_INT : __ sbfx(r0, r0, 0, 32); break; + case T_DOUBLE : + case T_FLOAT : + // Result is in v0 we'll save as needed + break; + case T_ARRAY: // Really a handle + case T_OBJECT: // Really a handle + break; // can't de-handlize until after safepoint check + case T_VOID: break; + case T_LONG: break; + default : ShouldNotReachHere(); + } + + // Switch thread to "native transition" state before reading the synchronization state. + // This additional state is necessary because reading and testing the synchronization + // state is not atomic w.r.t. GC, as this scenario demonstrates: + // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted. + // VM thread changes sync state to synchronizing and suspends threads for GC. + // Thread A is resumed to finish this native method, but doesn't block here since it + // didn't see any synchronization is progress, and escapes. + __ mov(rscratch1, _thread_in_native_trans); + + if(os::is_MP()) { + if (UseMembar) { + __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset())); + + // Force this write out before the read below + __ dmb(Assembler::SY); + } else { + __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); + __ stlrw(rscratch1, rscratch2); + + // Write serialization page so VM thread can do a pseudo remote membar. + // We use the current thread pointer to calculate a thread specific + // offset to write to within the page. This minimizes bus traffic + // due to cache line collision. + __ serialize_memory(rthread, r2); + } + } else { + __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset())); + } + + // check for safepoint operation in progress and/or pending suspend requests + Label safepoint_in_progress, safepoint_in_progress_done; + { + assert(SafepointSynchronize::_not_synchronized == 0, "fix this code"); + unsigned long offset; + __ adrp(rscratch1, + ExternalAddress((address)SafepointSynchronize::address_of_state()), + offset); + __ ldrw(rscratch1, Address(rscratch1, offset)); + __ cbnzw(rscratch1, safepoint_in_progress); + __ ldrw(rscratch1, Address(rthread, JavaThread::suspend_flags_offset())); + __ cbnzw(rscratch1, safepoint_in_progress); + __ bind(safepoint_in_progress_done); + } + + // change thread state + Label after_transition; + __ mov(rscratch1, _thread_in_Java); + __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); + __ stlrw(rscratch1, rscratch2); + __ bind(after_transition); + + Label reguard; + Label reguard_done; + __ ldrb(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset())); + __ cmpw(rscratch1, JavaThread::stack_guard_yellow_disabled); + __ br(Assembler::EQ, reguard); + __ bind(reguard_done); + + // native result if any is live + + // Unlock + Label unlock_done; + Label slow_path_unlock; + if (method->is_synchronized()) { + + // Get locked oop from the handle we passed to jni + __ ldr(obj_reg, Address(oop_handle_reg, 0)); + + Label done; + + if (UseBiasedLocking) { + __ biased_locking_exit(obj_reg, old_hdr, done); + } + + // Simple recursive lock? + + __ ldr(rscratch1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); + __ cbz(rscratch1, done); + + // Must save r0 if if it is live now because cmpxchg must use it + if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { + save_native_result(masm, ret_type, stack_slots); + } + + + // get address of the stack lock + __ lea(r0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); + // get old displaced header + __ ldr(old_hdr, Address(r0, 0)); + + // Atomic swap old header if oop still contains the stack lock + Label succeed; + __ cmpxchgptr(r0, old_hdr, obj_reg, rscratch1, succeed, &slow_path_unlock); + __ bind(succeed); + + // slow path re-enters here + __ bind(unlock_done); + if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { + restore_native_result(masm, ret_type, stack_slots); + } + + __ bind(done); + } + + Label dtrace_method_exit, dtrace_method_exit_done; + { + unsigned long offset; + __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset); + __ ldrb(rscratch1, Address(rscratch1, offset)); + __ cbnzw(rscratch1, dtrace_method_exit); + __ bind(dtrace_method_exit_done); + } + + __ reset_last_Java_frame(false); + + // Unbox oop result, e.g. JNIHandles::resolve result. + if (ret_type == T_OBJECT || ret_type == T_ARRAY) { + Label done, not_weak; + __ cbz(r0, done); // Use NULL as-is. + STATIC_ASSERT(JNIHandles::weak_tag_mask == 1u); + __ tbz(r0, 0, not_weak); // Test for jweak tag. + // Resolve jweak. + __ ldr(r0, Address(r0, -JNIHandles::weak_tag_value)); + __ verify_oop(r0); +#if INCLUDE_ALL_GCS + if (UseG1GC) { + __ g1_write_barrier_pre(noreg /* obj */, + r0 /* pre_val */, + rthread /* thread */, + rscratch2 /* tmp */, + true /* tosca_live */, + true /* expand_call */); + } +#endif // INCLUDE_ALL_GCS + __ b(done); + __ bind(not_weak); + // Resolve (untagged) jobject. + __ ldr(r0, Address(r0, 0)); + __ verify_oop(r0); + __ bind(done); + } + + if (!is_critical_native) { + // reset handle block + __ ldr(r2, Address(rthread, JavaThread::active_handles_offset())); + __ str(zr, Address(r2, JNIHandleBlock::top_offset_in_bytes())); + } + + __ leave(); + + if (!is_critical_native) { + // Any exception pending? + __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); + __ cbnz(rscratch1, exception_pending); + } + + // We're done + __ ret(lr); + + // Unexpected paths are out of line and go here + + if (!is_critical_native) { + // forward the exception + __ bind(exception_pending); + + // and forward the exception + __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); + } + + // Slow path locking & unlocking + if (method->is_synchronized()) { + + __ block_comment("Slow path lock {"); + __ bind(slow_path_lock); + + // has last_Java_frame setup. No exceptions so do vanilla call not call_VM + // args are (oop obj, BasicLock* lock, JavaThread* thread) + + // protect the args we've loaded + save_args(masm, total_c_args, c_arg, out_regs); + + __ mov(c_rarg0, obj_reg); + __ mov(c_rarg1, lock_reg); + __ mov(c_rarg2, rthread); + + // Not a leaf but we have last_Java_frame setup as we want + __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3); + restore_args(masm, total_c_args, c_arg, out_regs); + +#ifdef ASSERT + { Label L; + __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); + __ cbz(rscratch1, L); + __ stop("no pending exception allowed on exit from monitorenter"); + __ bind(L); + } +#endif + __ b(lock_done); + + __ block_comment("} Slow path lock"); + + __ block_comment("Slow path unlock {"); + __ bind(slow_path_unlock); + + // If we haven't already saved the native result we must save it now as xmm registers + // are still exposed. + + if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { + save_native_result(masm, ret_type, stack_slots); + } + + __ lea(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); + __ mov(c_rarg0, obj_reg); + + // Save pending exception around call to VM (which contains an EXCEPTION_MARK) + // NOTE that obj_reg == r19 currently + __ ldr(r19, Address(rthread, in_bytes(Thread::pending_exception_offset()))); + __ str(zr, Address(rthread, in_bytes(Thread::pending_exception_offset()))); + + rt_call(masm, CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), 2, 0, 1); + +#ifdef ASSERT + { + Label L; + __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); + __ cbz(rscratch1, L); + __ stop("no pending exception allowed on exit complete_monitor_unlocking_C"); + __ bind(L); + } +#endif /* ASSERT */ + + __ str(r19, Address(rthread, in_bytes(Thread::pending_exception_offset()))); + + if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { + restore_native_result(masm, ret_type, stack_slots); + } + __ b(unlock_done); + + __ block_comment("} Slow path unlock"); + + } // synchronized + + // SLOW PATH Reguard the stack if needed + + __ bind(reguard); + save_native_result(masm, ret_type, stack_slots); + rt_call(masm, CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages), 0, 0, 0); + restore_native_result(masm, ret_type, stack_slots); + // and continue + __ b(reguard_done); + + // SLOW PATH safepoint + { + __ block_comment("safepoint {"); + __ bind(safepoint_in_progress); + + // Don't use call_VM as it will see a possible pending exception and forward it + // and never return here preventing us from clearing _last_native_pc down below. + // + save_native_result(masm, ret_type, stack_slots); + __ mov(c_rarg0, rthread); +#ifndef PRODUCT + assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); +#endif + if (!is_critical_native) { + __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans))); + } else { + __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans_and_transition))); + } + __ blr(rscratch1); + __ maybe_isb(); + // Restore any method result value + restore_native_result(masm, ret_type, stack_slots); + + if (is_critical_native) { + // The call above performed the transition to thread_in_Java so + // skip the transition logic above. + __ b(after_transition); + } + + __ b(safepoint_in_progress_done); + __ block_comment("} safepoint"); + } + + // SLOW PATH dtrace support + { + __ block_comment("dtrace entry {"); + __ bind(dtrace_method_entry); + + // We have all of the arguments setup at this point. We must not touch any register + // argument registers at this point (what if we save/restore them there are no oop? + + save_args(masm, total_c_args, c_arg, out_regs); + __ mov_metadata(c_rarg1, method()); + __ call_VM_leaf( + CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), + rthread, c_rarg1); + restore_args(masm, total_c_args, c_arg, out_regs); + __ b(dtrace_method_entry_done); + __ block_comment("} dtrace entry"); + } + + { + __ block_comment("dtrace exit {"); + __ bind(dtrace_method_exit); + save_native_result(masm, ret_type, stack_slots); + __ mov_metadata(c_rarg1, method()); + __ call_VM_leaf( + CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), + rthread, c_rarg1); + restore_native_result(masm, ret_type, stack_slots); + __ b(dtrace_method_exit_done); + __ block_comment("} dtrace exit"); + } + + + __ flush(); + + nmethod *nm = nmethod::new_native_nmethod(method, + compile_id, + masm->code(), + vep_offset, + frame_complete, + stack_slots / VMRegImpl::slots_per_word, + (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)), + in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size), + oop_maps); + + if (is_critical_native) { + nm->set_lazy_critical_native(true); + } + + return nm; + +} + + +#ifdef HAVE_DTRACE_H +// --------------------------------------------------------------------------- +// Generate a dtrace nmethod for a given signature. The method takes arguments +// in the Java compiled code convention, marshals them to the native +// abi and then leaves nops at the position you would expect to call a native +// function. When the probe is enabled the nops are replaced with a trap +// instruction that dtrace inserts and the trace will cause a notification +// to dtrace. +// +// The probes are only able to take primitive types and java/lang/String as +// arguments. No other java types are allowed. Strings are converted to utf8 +// strings so that from dtrace point of view java strings are converted to C +// strings. There is an arbitrary fixed limit on the total space that a method +// can use for converting the strings. (256 chars per string in the signature). +// So any java string larger then this is truncated. + +static int fp_offset[ConcreteRegisterImpl::number_of_registers] = { 0 }; +static bool offsets_initialized = false; + + +nmethod *SharedRuntime::generate_dtrace_nmethod(MacroAssembler *masm, + methodHandle method) { Unimplemented(); return 0; } + +#endif // HAVE_DTRACE_H + +// this function returns the adjust size (in number of words) to a c2i adapter +// activation for use during deoptimization +int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) { + assert(callee_locals >= callee_parameters, + "test and remove; got more parms than locals"); + if (callee_locals < callee_parameters) + return 0; // No adjustment for negative locals + int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords; + // diff is counted in stack words + return round_to(diff, 2); +} + + +//------------------------------generate_deopt_blob---------------------------- +void SharedRuntime::generate_deopt_blob() { + // Allocate space for the code + ResourceMark rm; + // Setup code generation tools + CodeBuffer buffer("deopt_blob", 2048, 1024); + MacroAssembler* masm = new MacroAssembler(&buffer); + int frame_size_in_words; + OopMap* map = NULL; + OopMapSet *oop_maps = new OopMapSet(); + + // ------------- + // This code enters when returning to a de-optimized nmethod. A return + // address has been pushed on the the stack, and return values are in + // registers. + // If we are doing a normal deopt then we were called from the patched + // nmethod from the point we returned to the nmethod. So the return + // address on the stack is wrong by NativeCall::instruction_size + // We will adjust the value so it looks like we have the original return + // address on the stack (like when we eagerly deoptimized). + // In the case of an exception pending when deoptimizing, we enter + // with a return address on the stack that points after the call we patched + // into the exception handler. We have the following register state from, + // e.g., the forward exception stub (see stubGenerator_x86_64.cpp). + // r0: exception oop + // r19: exception handler + // r3: throwing pc + // So in this case we simply jam r3 into the useless return address and + // the stack looks just like we want. + // + // At this point we need to de-opt. We save the argument return + // registers. We call the first C routine, fetch_unroll_info(). This + // routine captures the return values and returns a structure which + // describes the current frame size and the sizes of all replacement frames. + // The current frame is compiled code and may contain many inlined + // functions, each with their own JVM state. We pop the current frame, then + // push all the new frames. Then we call the C routine unpack_frames() to + // populate these frames. Finally unpack_frames() returns us the new target + // address. Notice that callee-save registers are BLOWN here; they have + // already been captured in the vframeArray at the time the return PC was + // patched. + address start = __ pc(); + Label cont; + + // Prolog for non exception case! + + // Save everything in sight. + map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); + + // Normal deoptimization. Save exec mode for unpack_frames. + __ movw(rcpool, Deoptimization::Unpack_deopt); // callee-saved + __ b(cont); + + int reexecute_offset = __ pc() - start; + + // Reexecute case + // return address is the pc describes what bci to do re-execute at + + // No need to update map as each call to save_live_registers will produce identical oopmap + (void) RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); + + __ movw(rcpool, Deoptimization::Unpack_reexecute); // callee-saved + __ b(cont); + + int exception_offset = __ pc() - start; + + // Prolog for exception case + + // all registers are dead at this entry point, except for r0, and + // r3 which contain the exception oop and exception pc + // respectively. Set them in TLS and fall thru to the + // unpack_with_exception_in_tls entry point. + + __ str(r3, Address(rthread, JavaThread::exception_pc_offset())); + __ str(r0, Address(rthread, JavaThread::exception_oop_offset())); + + int exception_in_tls_offset = __ pc() - start; + + // new implementation because exception oop is now passed in JavaThread + + // Prolog for exception case + // All registers must be preserved because they might be used by LinearScan + // Exceptiop oop and throwing PC are passed in JavaThread + // tos: stack at point of call to method that threw the exception (i.e. only + // args are on the stack, no return address) + + // The return address pushed by save_live_registers will be patched + // later with the throwing pc. The correct value is not available + // now because loading it from memory would destroy registers. + + // NB: The SP at this point must be the SP of the method that is + // being deoptimized. Deoptimization assumes that the frame created + // here by save_live_registers is immediately below the method's SP. + // This is a somewhat fragile mechanism. + + // Save everything in sight. + map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); + + // Now it is safe to overwrite any register + + // Deopt during an exception. Save exec mode for unpack_frames. + __ mov(rcpool, Deoptimization::Unpack_exception); // callee-saved + + // load throwing pc from JavaThread and patch it as the return address + // of the current frame. Then clear the field in JavaThread + + __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset())); + __ str(r3, Address(rfp, wordSize)); + __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); + +#ifdef ASSERT + // verify that there is really an exception oop in JavaThread + __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); + __ verify_oop(r0); + + // verify that there is no pending exception + Label no_pending_exception; + __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); + __ cbz(rscratch1, no_pending_exception); + __ stop("must not have pending exception here"); + __ bind(no_pending_exception); +#endif + + __ bind(cont); + + // Call C code. Need thread and this frame, but NOT official VM entry + // crud. We cannot block on this call, no GC can happen. + // + // UnrollBlock* fetch_unroll_info(JavaThread* thread) + + // fetch_unroll_info needs to call last_java_frame(). + + Label retaddr; + __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); +#ifdef ASSERT0 + { Label L; + __ ldr(rscratch1, Address(rthread, + JavaThread::last_Java_fp_offset())); + __ cbz(rscratch1, L); + __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared"); + __ bind(L); + } +#endif // ASSERT + __ mov(c_rarg0, rthread); + __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info))); + __ blr(rscratch1); + __ bind(retaddr); + + // Need to have an oopmap that tells fetch_unroll_info where to + // find any register it might need. + oop_maps->add_gc_map(__ pc() - start, map); + + __ reset_last_Java_frame(false); + + // Load UnrollBlock* into rdi + __ mov(r5, r0); + + Label noException; + __ cmpw(rcpool, Deoptimization::Unpack_exception); // Was exception pending? + __ br(Assembler::NE, noException); + __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); + // QQQ this is useless it was NULL above + __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset())); + __ str(zr, Address(rthread, JavaThread::exception_oop_offset())); + __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); + + __ verify_oop(r0); + + // Overwrite the result registers with the exception results. + __ str(r0, Address(sp, RegisterSaver::r0_offset_in_bytes())); + // I think this is useless + // __ str(r3, Address(sp, RegisterSaver::r3_offset_in_bytes())); + + __ bind(noException); + + // Only register save data is on the stack. + // Now restore the result registers. Everything else is either dead + // or captured in the vframeArray. + RegisterSaver::restore_result_registers(masm); + + // All of the register save area has been popped of the stack. Only the + // return address remains. + + // Pop all the frames we must move/replace. + // + // Frame picture (youngest to oldest) + // 1: self-frame (no frame link) + // 2: deopting frame (no frame link) + // 3: caller of deopting frame (could be compiled/interpreted). + // + // Note: by leaving the return address of self-frame on the stack + // and using the size of frame 2 to adjust the stack + // when we are done the return to frame 3 will still be on the stack. + + // Pop deoptimized frame + __ ldrw(r2, Address(r5, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset_in_bytes())); + __ sub(r2, r2, 2 * wordSize); + __ add(sp, sp, r2); + __ ldp(rfp, lr, __ post(sp, 2 * wordSize)); + // LR should now be the return address to the caller (3) + + // Stack bang to make sure there's enough room for these interpreter frames. + if (UseStackBanging) { + __ ldrw(r19, Address(r5, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes())); + __ bang_stack_size(r19, r2); + } + + // Load address of array of frame pcs into r2 + __ ldr(r2, Address(r5, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes())); + + // Trash the old pc + // __ addptr(sp, wordSize); FIXME ???? + + // Load address of array of frame sizes into r4 + __ ldr(r4, Address(r5, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes())); + + // Load counter into r3 + __ ldrw(r3, Address(r5, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes())); + + // Now adjust the caller's stack to make up for the extra locals + // but record the original sp so that we can save it in the skeletal interpreter + // frame and the stack walking of interpreter_sender will get the unextended sp + // value and not the "real" sp value. + + const Register sender_sp = r6; + + __ mov(sender_sp, sp); + __ ldrw(r19, Address(r5, + Deoptimization::UnrollBlock:: + caller_adjustment_offset_in_bytes())); + __ sub(sp, sp, r19); + + // Push interpreter frames in a loop + __ mov(rscratch1, (address)badHeapOopVal); // Make a recognizable pattern + __ mov(rscratch2, rscratch1); + Label loop; + __ bind(loop); + __ ldr(r19, Address(__ post(r4, wordSize))); // Load frame size + __ sub(r19, r19, 2*wordSize); // We'll push pc and fp by hand + __ ldr(lr, Address(__ post(r2, wordSize))); // Load pc + __ enter(); // Save old & set new fp + __ sub(sp, sp, r19); // Prolog + // This value is corrected by layout_activation_impl + __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable + __ mov(sender_sp, sp); // Pass sender_sp to next frame + __ sub(r3, r3, 1); // Decrement counter + __ cbnz(r3, loop); + + // Re-push self-frame + __ ldr(lr, Address(r2)); + __ enter(); + + // Allocate a full sized register save area. We subtract 2 because + // enter() just pushed 2 words + __ sub(sp, sp, (frame_size_in_words - 2) * wordSize); + + // Restore frame locals after moving the frame + __ strd(v0, Address(sp, RegisterSaver::v0_offset_in_bytes())); + __ str(r0, Address(sp, RegisterSaver::r0_offset_in_bytes())); + + // Call C code. Need thread but NOT official VM entry + // crud. We cannot block on this call, no GC can happen. Call should + // restore return values to their stack-slots with the new SP. + // + // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode) + + // Use rfp because the frames look interpreted now + // Don't need the precise return PC here, just precise enough to point into this code blob. + address the_pc = __ pc(); + __ set_last_Java_frame(sp, rfp, the_pc, rscratch1); + + __ mov(c_rarg0, rthread); + __ movw(c_rarg1, rcpool); // second arg: exec_mode + __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); + __ blr(rscratch1); + + // Set an oopmap for the call site + // Use the same PC we used for the last java frame + oop_maps->add_gc_map(the_pc - start, + new OopMap( frame_size_in_words, 0 )); + + // Clear fp AND pc + __ reset_last_Java_frame(true); + + // Collect return values + __ ldrd(v0, Address(sp, RegisterSaver::v0_offset_in_bytes())); + __ ldr(r0, Address(sp, RegisterSaver::r0_offset_in_bytes())); + // I think this is useless (throwing pc?) + // __ ldr(r3, Address(sp, RegisterSaver::r3_offset_in_bytes())); + + // Pop self-frame. + __ leave(); // Epilog + + // Jump to interpreter + __ ret(lr); + + // Make sure all code is generated + masm->flush(); + + _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words); + _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset); +} + +uint SharedRuntime::out_preserve_stack_slots() { + return 0; +} + +#ifdef COMPILER2 +//------------------------------generate_uncommon_trap_blob-------------------- +void SharedRuntime::generate_uncommon_trap_blob() { + // Allocate space for the code + ResourceMark rm; + // Setup code generation tools + CodeBuffer buffer("uncommon_trap_blob", 2048, 1024); + MacroAssembler* masm = new MacroAssembler(&buffer); + + assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); + + address start = __ pc(); + + // Push self-frame. We get here with a return address in LR + // and sp should be 16 byte aligned + // push rfp and retaddr by hand + __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize))); + // we don't expect an arg reg save area +#ifndef PRODUCT + assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); +#endif + // compiler left unloaded_class_index in j_rarg0 move to where the + // runtime expects it. + if (c_rarg1 != j_rarg0) { + __ movw(c_rarg1, j_rarg0); + } + + // we need to set the past SP to the stack pointer of the stub frame + // and the pc to the address where this runtime call will return + // although actually any pc in this code blob will do). + Label retaddr; + __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); + + // Call C code. Need thread but NOT official VM entry + // crud. We cannot block on this call, no GC can happen. Call should + // capture callee-saved registers as well as return values. + // Thread is in rdi already. + // + // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); + // + // n.b. 2 gp args, 0 fp args, integral return type + + __ mov(c_rarg0, rthread); + __ lea(rscratch1, + RuntimeAddress(CAST_FROM_FN_PTR(address, + Deoptimization::uncommon_trap))); + __ blr(rscratch1); + __ bind(retaddr); + + // Set an oopmap for the call site + OopMapSet* oop_maps = new OopMapSet(); + OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0); + + // location of rfp is known implicitly by the frame sender code + + oop_maps->add_gc_map(__ pc() - start, map); + + __ reset_last_Java_frame(false); + + // move UnrollBlock* into r4 + __ mov(r4, r0); + + // Pop all the frames we must move/replace. + // + // Frame picture (youngest to oldest) + // 1: self-frame (no frame link) + // 2: deopting frame (no frame link) + // 3: caller of deopting frame (could be compiled/interpreted). + + // Pop self-frame. We have no frame, and must rely only on r0 and sp. + __ add(sp, sp, (SimpleRuntimeFrame::framesize) << LogBytesPerInt); // Epilog! + + // Pop deoptimized frame (int) + __ ldrw(r2, Address(r4, + Deoptimization::UnrollBlock:: + size_of_deoptimized_frame_offset_in_bytes())); + __ sub(r2, r2, 2 * wordSize); + __ add(sp, sp, r2); + __ ldp(rfp, lr, __ post(sp, 2 * wordSize)); + // LR should now be the return address to the caller (3) frame + + // Stack bang to make sure there's enough room for these interpreter frames. + if (UseStackBanging) { + __ ldrw(r1, Address(r4, + Deoptimization::UnrollBlock:: + total_frame_sizes_offset_in_bytes())); + __ bang_stack_size(r1, r2); + } + + // Load address of array of frame pcs into r2 (address*) + __ ldr(r2, Address(r4, + Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes())); + + // Load address of array of frame sizes into r5 (intptr_t*) + __ ldr(r5, Address(r4, + Deoptimization::UnrollBlock:: + frame_sizes_offset_in_bytes())); + + // Counter + __ ldrw(r3, Address(r4, + Deoptimization::UnrollBlock:: + number_of_frames_offset_in_bytes())); // (int) + + // Now adjust the caller's stack to make up for the extra locals but + // record the original sp so that we can save it in the skeletal + // interpreter frame and the stack walking of interpreter_sender + // will get the unextended sp value and not the "real" sp value. + + const Register sender_sp = r8; + + __ mov(sender_sp, sp); + __ ldrw(r1, Address(r4, + Deoptimization::UnrollBlock:: + caller_adjustment_offset_in_bytes())); // (int) + __ sub(sp, sp, r1); + + // Push interpreter frames in a loop + Label loop; + __ bind(loop); + __ ldr(r1, Address(r5, 0)); // Load frame size + __ sub(r1, r1, 2 * wordSize); // We'll push pc and rfp by hand + __ ldr(lr, Address(r2, 0)); // Save return address + __ enter(); // and old rfp & set new rfp + __ sub(sp, sp, r1); // Prolog + __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable + // This value is corrected by layout_activation_impl + __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + __ mov(sender_sp, sp); // Pass sender_sp to next frame + __ add(r5, r5, wordSize); // Bump array pointer (sizes) + __ add(r2, r2, wordSize); // Bump array pointer (pcs) + __ subsw(r3, r3, 1); // Decrement counter + __ br(Assembler::GT, loop); + __ ldr(lr, Address(r2, 0)); // save final return address + // Re-push self-frame + __ enter(); // & old rfp & set new rfp + + // Use rfp because the frames look interpreted now + // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP. + // Don't need the precise return PC here, just precise enough to point into this code blob. + address the_pc = __ pc(); + __ set_last_Java_frame(sp, rfp, the_pc, rscratch1); + + // Call C code. Need thread but NOT official VM entry + // crud. We cannot block on this call, no GC can happen. Call should + // restore return values to their stack-slots with the new SP. + // Thread is in rdi already. + // + // BasicType unpack_frames(JavaThread* thread, int exec_mode); + // + // n.b. 2 gp args, 0 fp args, integral return type + + // sp should already be aligned + __ mov(c_rarg0, rthread); + __ movw(c_rarg1, (unsigned)Deoptimization::Unpack_uncommon_trap); + __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); + __ blr(rscratch1); + + // Set an oopmap for the call site + // Use the same PC we used for the last java frame + oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); + + // Clear fp AND pc + __ reset_last_Java_frame(true); + + // Pop self-frame. + __ leave(); // Epilog + + // Jump to interpreter + __ ret(lr); + + // Make sure all code is generated + masm->flush(); + + _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps, + SimpleRuntimeFrame::framesize >> 1); +} +#endif // COMPILER2 + + +//------------------------------generate_handler_blob------ +// +// Generate a special Compile2Runtime blob that saves all registers, +// and setup oopmap. +// +SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) { + ResourceMark rm; + OopMapSet *oop_maps = new OopMapSet(); + OopMap* map; + + // Allocate space for the code. Setup code generation tools. + CodeBuffer buffer("handler_blob", 2048, 1024); + MacroAssembler* masm = new MacroAssembler(&buffer); + + address start = __ pc(); + address call_pc = NULL; + int frame_size_in_words; + bool cause_return = (poll_type == POLL_AT_RETURN); + bool save_vectors = (poll_type == POLL_AT_VECTOR_LOOP); + + // Save Integer and Float registers. + map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words, save_vectors); + + // The following is basically a call_VM. However, we need the precise + // address of the call in order to generate an oopmap. Hence, we do all the + // work outselves. + + Label retaddr; + __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); + + // The return address must always be correct so that frame constructor never + // sees an invalid pc. + + if (!cause_return) { + // overwrite the return address pushed by save_live_registers + __ ldr(c_rarg0, Address(rthread, JavaThread::saved_exception_pc_offset())); + __ str(c_rarg0, Address(rfp, wordSize)); + } + + // Do the call + __ mov(c_rarg0, rthread); + __ lea(rscratch1, RuntimeAddress(call_ptr)); + __ blr(rscratch1); + __ bind(retaddr); + + // Set an oopmap for the call site. This oopmap will map all + // oop-registers and debug-info registers as callee-saved. This + // will allow deoptimization at this safepoint to find all possible + // debug-info recordings, as well as let GC find all oops. + + oop_maps->add_gc_map( __ pc() - start, map); + + Label noException; + + __ reset_last_Java_frame(false); + + __ maybe_isb(); + __ membar(Assembler::LoadLoad | Assembler::LoadStore); + + __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); + __ cbz(rscratch1, noException); + + // Exception pending + + RegisterSaver::restore_live_registers(masm); + + __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); + + // No exception case + __ bind(noException); + + // Normal exit, restore registers and exit. + RegisterSaver::restore_live_registers(masm, save_vectors); + + __ ret(lr); + + // Make sure all code is generated + masm->flush(); + + // Fill-out other meta info + return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words); +} + +// +// generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss +// +// Generate a stub that calls into vm to find out the proper destination +// of a java call. All the argument registers are live at this point +// but since this is generic code we don't know what they are and the caller +// must do any gc of the args. +// +RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) { + assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before"); + + // allocate space for the code + ResourceMark rm; + + CodeBuffer buffer(name, 1000, 512); + MacroAssembler* masm = new MacroAssembler(&buffer); + + int frame_size_in_words; + + OopMapSet *oop_maps = new OopMapSet(); + OopMap* map = NULL; + + int start = __ offset(); + + map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words); + + int frame_complete = __ offset(); + + { + Label retaddr; + __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); + + __ mov(c_rarg0, rthread); + __ lea(rscratch1, RuntimeAddress(destination)); + + __ blr(rscratch1); + __ bind(retaddr); + } + + // Set an oopmap for the call site. + // We need this not only for callee-saved registers, but also for volatile + // registers that the compiler might be keeping live across a safepoint. + + oop_maps->add_gc_map( __ offset() - start, map); + + __ maybe_isb(); + + // r0 contains the address we are going to jump to assuming no exception got installed + + // clear last_Java_sp + __ reset_last_Java_frame(false); + // check for pending exceptions + Label pending; + __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); + __ cbnz(rscratch1, pending); + + // get the returned Method* + __ get_vm_result_2(rmethod, rthread); + __ str(rmethod, Address(sp, RegisterSaver::reg_offset_in_bytes(rmethod))); + + // r0 is where we want to jump, overwrite rscratch1 which is saved and scratch + __ str(r0, Address(sp, RegisterSaver::rscratch1_offset_in_bytes())); + RegisterSaver::restore_live_registers(masm); + + // We are back the the original state on entry and ready to go. + + __ br(rscratch1); + + // Pending exception after the safepoint + + __ bind(pending); + + RegisterSaver::restore_live_registers(masm); + + // exception pending => remove activation and forward to exception handler + + __ str(zr, Address(rthread, JavaThread::vm_result_offset())); + + __ ldr(r0, Address(rthread, Thread::pending_exception_offset())); + __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); + + // ------------- + // make sure all code is generated + masm->flush(); + + // return the blob + // frame_size_words or bytes?? + return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true); +} + + +#ifdef COMPILER2 +// This is here instead of runtime_x86_64.cpp because it uses SimpleRuntimeFrame +// +//------------------------------generate_exception_blob--------------------------- +// creates exception blob at the end +// Using exception blob, this code is jumped from a compiled method. +// (see emit_exception_handler in x86_64.ad file) +// +// Given an exception pc at a call we call into the runtime for the +// handler in this method. This handler might merely restore state +// (i.e. callee save registers) unwind the frame and jump to the +// exception handler for the nmethod if there is no Java level handler +// for the nmethod. +// +// This code is entered with a jmp. +// +// Arguments: +// r0: exception oop +// r3: exception pc +// +// Results: +// r0: exception oop +// r3: exception pc in caller or ??? +// destination: exception handler of caller +// +// Note: the exception pc MUST be at a call (precise debug information) +// Registers r0, r3, r2, r4, r5, r8-r11 are not callee saved. +// + +void OptoRuntime::generate_exception_blob() { + assert(!OptoRuntime::is_callee_saved_register(R3_num), ""); + assert(!OptoRuntime::is_callee_saved_register(R0_num), ""); + assert(!OptoRuntime::is_callee_saved_register(R2_num), ""); + + assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); + + // Allocate space for the code + ResourceMark rm; + // Setup code generation tools + CodeBuffer buffer("exception_blob", 2048, 1024); + MacroAssembler* masm = new MacroAssembler(&buffer); + + // TODO check various assumptions made here + // + // make sure we do so before running this + + address start = __ pc(); + + // push rfp and retaddr by hand + // Exception pc is 'return address' for stack walker + __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize))); + // there are no callee save registers and we don't expect an + // arg reg save area +#ifndef PRODUCT + assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); +#endif + // Store exception in Thread object. We cannot pass any arguments to the + // handle_exception call, since we do not want to make any assumption + // about the size of the frame where the exception happened in. + __ str(r0, Address(rthread, JavaThread::exception_oop_offset())); + __ str(r3, Address(rthread, JavaThread::exception_pc_offset())); + + // This call does all the hard work. It checks if an exception handler + // exists in the method. + // If so, it returns the handler address. + // If not, it prepares for stack-unwinding, restoring the callee-save + // registers of the frame being removed. + // + // address OptoRuntime::handle_exception_C(JavaThread* thread) + // + // n.b. 1 gp arg, 0 fp args, integral return type + + // the stack should always be aligned + address the_pc = __ pc(); + __ set_last_Java_frame(sp, noreg, the_pc, rscratch1); + __ mov(c_rarg0, rthread); + __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C))); + __ blr(rscratch1); + __ maybe_isb(); + + // Set an oopmap for the call site. This oopmap will only be used if we + // are unwinding the stack. Hence, all locations will be dead. + // Callee-saved registers will be the same as the frame above (i.e., + // handle_exception_stub), since they were restored when we got the + // exception. + + OopMapSet* oop_maps = new OopMapSet(); + + oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); + + __ reset_last_Java_frame(false); + + // Restore callee-saved registers + + // rfp is an implicitly saved callee saved register (i.e. the calling + // convention will save restore it in prolog/epilog) Other than that + // there are no callee save registers now that adapter frames are gone. + // and we dont' expect an arg reg save area + __ ldp(rfp, r3, Address(__ post(sp, 2 * wordSize))); + + // r0: exception handler + + // Restore SP from BP if the exception PC is a MethodHandle call site. + __ ldrw(rscratch1, Address(rthread, JavaThread::is_method_handle_return_offset())); + // n.b. Intel uses special register rbp_mh_SP_save here but we will + // just hard wire rfp + __ cmpw(rscratch1, zr); + // the obvious way to conditionally copy rfp to sp if NE + // Label skip; + // __ br(Assembler::EQ, skip); + // __ mov(sp, rfp); + // __ bind(skip); + // same but branchless + __ mov(rscratch1, sp); + __ csel(rscratch1, rfp, rscratch1, Assembler::NE); + __ mov(sp, rscratch1); + + // We have a handler in r0 (could be deopt blob). + __ mov(r8, r0); + + // Get the exception oop + __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); + // Get the exception pc in case we are deoptimized + __ ldr(r4, Address(rthread, JavaThread::exception_pc_offset())); +#ifdef ASSERT + __ str(zr, Address(rthread, JavaThread::exception_handler_pc_offset())); + __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); +#endif + // Clear the exception oop so GC no longer processes it as a root. + __ str(zr, Address(rthread, JavaThread::exception_oop_offset())); + + // r0: exception oop + // r8: exception handler + // r4: exception pc + // Jump to handler + + __ br(r8); + + // Make sure all code is generated + masm->flush(); + + // Set exception blob + _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1); +} +#endif // COMPILER2