/* * Copyright (c) 1999, 2011, Oracle and/or its affiliates. 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/assembler.hpp" #include "assembler_x86.inline.hpp" #include "interpreter/interpreter.hpp" #include "nativeInst_x86.hpp" #include "oops/instanceOop.hpp" #include "oops/methodOop.hpp" #include "oops/objArrayKlass.hpp" #include "oops/oop.inline.hpp" #include "prims/methodHandles.hpp" #include "runtime/frame.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/stubCodeGenerator.hpp" #include "runtime/stubRoutines.hpp" #include "utilities/top.hpp" #ifdef TARGET_OS_FAMILY_linux # include "thread_linux.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_solaris # include "thread_solaris.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_windows # include "thread_windows.inline.hpp" #endif #ifdef COMPILER2 #include "opto/runtime.hpp" #endif // Declaration and definition of StubGenerator (no .hpp file). // For a more detailed description of the stub routine structure // see the comment in stubRoutines.hpp #define __ _masm-> #define a__ ((Assembler*)_masm)-> #ifdef PRODUCT #define BLOCK_COMMENT(str) /* nothing */ #else #define BLOCK_COMMENT(str) __ block_comment(str) #endif #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") const int MXCSR_MASK = 0xFFC0; // Mask out any pending exceptions const int FPU_CNTRL_WRD_MASK = 0xFFFF; // ------------------------------------------------------------------------------------------------------------------------- // Stub Code definitions static address handle_unsafe_access() { JavaThread* thread = JavaThread::current(); address pc = thread->saved_exception_pc(); // pc is the instruction which we must emulate // doing a no-op is fine: return garbage from the load // therefore, compute npc address npc = Assembler::locate_next_instruction(pc); // request an async exception thread->set_pending_unsafe_access_error(); // return address of next instruction to execute return npc; } class StubGenerator: public StubCodeGenerator { private: #ifdef PRODUCT #define inc_counter_np(counter) (0) #else void inc_counter_np_(int& counter) { __ incrementl(ExternalAddress((address)&counter)); } #define inc_counter_np(counter) \ BLOCK_COMMENT("inc_counter " #counter); \ inc_counter_np_(counter); #endif //PRODUCT void inc_copy_counter_np(BasicType t) { #ifndef PRODUCT switch (t) { case T_BYTE: inc_counter_np(SharedRuntime::_jbyte_array_copy_ctr); return; case T_SHORT: inc_counter_np(SharedRuntime::_jshort_array_copy_ctr); return; case T_INT: inc_counter_np(SharedRuntime::_jint_array_copy_ctr); return; case T_LONG: inc_counter_np(SharedRuntime::_jlong_array_copy_ctr); return; case T_OBJECT: inc_counter_np(SharedRuntime::_oop_array_copy_ctr); return; } ShouldNotReachHere(); #endif //PRODUCT } //------------------------------------------------------------------------------------------------------------------------ // Call stubs are used to call Java from C // // [ return_from_Java ] <--- rsp // [ argument word n ] // ... // -N [ argument word 1 ] // -7 [ Possible padding for stack alignment ] // -6 [ Possible padding for stack alignment ] // -5 [ Possible padding for stack alignment ] // -4 [ mxcsr save ] <--- rsp_after_call // -3 [ saved rbx, ] // -2 [ saved rsi ] // -1 [ saved rdi ] // 0 [ saved rbp, ] <--- rbp, // 1 [ return address ] // 2 [ ptr. to call wrapper ] // 3 [ result ] // 4 [ result_type ] // 5 [ method ] // 6 [ entry_point ] // 7 [ parameters ] // 8 [ parameter_size ] // 9 [ thread ] address generate_call_stub(address& return_address) { StubCodeMark mark(this, "StubRoutines", "call_stub"); address start = __ pc(); // stub code parameters / addresses assert(frame::entry_frame_call_wrapper_offset == 2, "adjust this code"); bool sse_save = false; const Address rsp_after_call(rbp, -4 * wordSize); // same as in generate_catch_exception()! const int locals_count_in_bytes (4*wordSize); const Address mxcsr_save (rbp, -4 * wordSize); const Address saved_rbx (rbp, -3 * wordSize); const Address saved_rsi (rbp, -2 * wordSize); const Address saved_rdi (rbp, -1 * wordSize); const Address result (rbp, 3 * wordSize); const Address result_type (rbp, 4 * wordSize); const Address method (rbp, 5 * wordSize); const Address entry_point (rbp, 6 * wordSize); const Address parameters (rbp, 7 * wordSize); const Address parameter_size(rbp, 8 * wordSize); const Address thread (rbp, 9 * wordSize); // same as in generate_catch_exception()! sse_save = UseSSE > 0; // stub code __ enter(); __ movptr(rcx, parameter_size); // parameter counter __ shlptr(rcx, Interpreter::logStackElementSize); // convert parameter count to bytes __ addptr(rcx, locals_count_in_bytes); // reserve space for register saves __ subptr(rsp, rcx); __ andptr(rsp, -(StackAlignmentInBytes)); // Align stack // save rdi, rsi, & rbx, according to C calling conventions __ movptr(saved_rdi, rdi); __ movptr(saved_rsi, rsi); __ movptr(saved_rbx, rbx); // save and initialize %mxcsr if (sse_save) { Label skip_ldmx; __ stmxcsr(mxcsr_save); __ movl(rax, mxcsr_save); __ andl(rax, MXCSR_MASK); // Only check control and mask bits ExternalAddress mxcsr_std(StubRoutines::addr_mxcsr_std()); __ cmp32(rax, mxcsr_std); __ jcc(Assembler::equal, skip_ldmx); __ ldmxcsr(mxcsr_std); __ bind(skip_ldmx); } // make sure the control word is correct. __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std())); #ifdef ASSERT // make sure we have no pending exceptions { Label L; __ movptr(rcx, thread); __ cmpptr(Address(rcx, Thread::pending_exception_offset()), (int32_t)NULL_WORD); __ jcc(Assembler::equal, L); __ stop("StubRoutines::call_stub: entered with pending exception"); __ bind(L); } #endif // pass parameters if any BLOCK_COMMENT("pass parameters if any"); Label parameters_done; __ movl(rcx, parameter_size); // parameter counter __ testl(rcx, rcx); __ jcc(Assembler::zero, parameters_done); // parameter passing loop Label loop; // Copy Java parameters in reverse order (receiver last) // Note that the argument order is inverted in the process // source is rdx[rcx: N-1..0] // dest is rsp[rbx: 0..N-1] __ movptr(rdx, parameters); // parameter pointer __ xorptr(rbx, rbx); __ BIND(loop); // get parameter __ movptr(rax, Address(rdx, rcx, Interpreter::stackElementScale(), -wordSize)); __ movptr(Address(rsp, rbx, Interpreter::stackElementScale(), Interpreter::expr_offset_in_bytes(0)), rax); // store parameter __ increment(rbx); __ decrement(rcx); __ jcc(Assembler::notZero, loop); // call Java function __ BIND(parameters_done); __ movptr(rbx, method); // get methodOop __ movptr(rax, entry_point); // get entry_point __ mov(rsi, rsp); // set sender sp BLOCK_COMMENT("call Java function"); __ call(rax); BLOCK_COMMENT("call_stub_return_address:"); return_address = __ pc(); #ifdef COMPILER2 { Label L_skip; if (UseSSE >= 2) { __ verify_FPU(0, "call_stub_return"); } else { for (int i = 1; i < 8; i++) { __ ffree(i); } // UseSSE <= 1 so double result should be left on TOS __ movl(rsi, result_type); __ cmpl(rsi, T_DOUBLE); __ jcc(Assembler::equal, L_skip); if (UseSSE == 0) { // UseSSE == 0 so float result should be left on TOS __ cmpl(rsi, T_FLOAT); __ jcc(Assembler::equal, L_skip); } __ ffree(0); } __ BIND(L_skip); } #endif // COMPILER2 // store result depending on type // (everything that is not T_LONG, T_FLOAT or T_DOUBLE is treated as T_INT) __ movptr(rdi, result); Label is_long, is_float, is_double, exit; __ movl(rsi, result_type); __ cmpl(rsi, T_LONG); __ jcc(Assembler::equal, is_long); __ cmpl(rsi, T_FLOAT); __ jcc(Assembler::equal, is_float); __ cmpl(rsi, T_DOUBLE); __ jcc(Assembler::equal, is_double); // handle T_INT case __ movl(Address(rdi, 0), rax); __ BIND(exit); // check that FPU stack is empty __ verify_FPU(0, "generate_call_stub"); // pop parameters __ lea(rsp, rsp_after_call); // restore %mxcsr if (sse_save) { __ ldmxcsr(mxcsr_save); } // restore rdi, rsi and rbx, __ movptr(rbx, saved_rbx); __ movptr(rsi, saved_rsi); __ movptr(rdi, saved_rdi); __ addptr(rsp, 4*wordSize); // return __ pop(rbp); __ ret(0); // handle return types different from T_INT __ BIND(is_long); __ movl(Address(rdi, 0 * wordSize), rax); __ movl(Address(rdi, 1 * wordSize), rdx); __ jmp(exit); __ BIND(is_float); // interpreter uses xmm0 for return values if (UseSSE >= 1) { __ movflt(Address(rdi, 0), xmm0); } else { __ fstp_s(Address(rdi, 0)); } __ jmp(exit); __ BIND(is_double); // interpreter uses xmm0 for return values if (UseSSE >= 2) { __ movdbl(Address(rdi, 0), xmm0); } else { __ fstp_d(Address(rdi, 0)); } __ jmp(exit); return start; } //------------------------------------------------------------------------------------------------------------------------ // Return point for a Java call if there's an exception thrown in Java code. // The exception is caught and transformed into a pending exception stored in // JavaThread that can be tested from within the VM. // // Note: Usually the parameters are removed by the callee. In case of an exception // crossing an activation frame boundary, that is not the case if the callee // is compiled code => need to setup the rsp. // // rax,: exception oop address generate_catch_exception() { StubCodeMark mark(this, "StubRoutines", "catch_exception"); const Address rsp_after_call(rbp, -4 * wordSize); // same as in generate_call_stub()! const Address thread (rbp, 9 * wordSize); // same as in generate_call_stub()! address start = __ pc(); // get thread directly __ movptr(rcx, thread); #ifdef ASSERT // verify that threads correspond { Label L; __ get_thread(rbx); __ cmpptr(rbx, rcx); __ jcc(Assembler::equal, L); __ stop("StubRoutines::catch_exception: threads must correspond"); __ bind(L); } #endif // set pending exception __ verify_oop(rax); __ movptr(Address(rcx, Thread::pending_exception_offset()), rax ); __ lea(Address(rcx, Thread::exception_file_offset ()), ExternalAddress((address)__FILE__)); __ movl(Address(rcx, Thread::exception_line_offset ()), __LINE__ ); // complete return to VM assert(StubRoutines::_call_stub_return_address != NULL, "_call_stub_return_address must have been generated before"); __ jump(RuntimeAddress(StubRoutines::_call_stub_return_address)); return start; } //------------------------------------------------------------------------------------------------------------------------ // Continuation point for runtime calls returning with a pending exception. // The pending exception check happened in the runtime or native call stub. // The pending exception in Thread is converted into a Java-level exception. // // Contract with Java-level exception handlers: // rax: exception // rdx: throwing pc // // NOTE: At entry of this stub, exception-pc must be on stack !! address generate_forward_exception() { StubCodeMark mark(this, "StubRoutines", "forward exception"); address start = __ pc(); const Register thread = rcx; // other registers used in this stub const Register exception_oop = rax; const Register handler_addr = rbx; const Register exception_pc = rdx; // Upon entry, the sp points to the return address returning into Java // (interpreted or compiled) code; i.e., the return address becomes the // throwing pc. // // Arguments pushed before the runtime call are still on the stack but // the exception handler will reset the stack pointer -> ignore them. // A potential result in registers can be ignored as well. #ifdef ASSERT // make sure this code is only executed if there is a pending exception { Label L; __ get_thread(thread); __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD); __ jcc(Assembler::notEqual, L); __ stop("StubRoutines::forward exception: no pending exception (1)"); __ bind(L); } #endif // compute exception handler into rbx, __ get_thread(thread); __ movptr(exception_pc, Address(rsp, 0)); BLOCK_COMMENT("call exception_handler_for_return_address"); __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), thread, exception_pc); __ mov(handler_addr, rax); // setup rax & rdx, remove return address & clear pending exception __ get_thread(thread); __ pop(exception_pc); __ movptr(exception_oop, Address(thread, Thread::pending_exception_offset())); __ movptr(Address(thread, Thread::pending_exception_offset()), NULL_WORD); #ifdef ASSERT // make sure exception is set { Label L; __ testptr(exception_oop, exception_oop); __ jcc(Assembler::notEqual, L); __ stop("StubRoutines::forward exception: no pending exception (2)"); __ bind(L); } #endif // Verify that there is really a valid exception in RAX. __ verify_oop(exception_oop); // Restore SP from BP if the exception PC is a MethodHandle call site. __ cmpl(Address(thread, JavaThread::is_method_handle_return_offset()), 0); __ cmovptr(Assembler::notEqual, rsp, rbp); // continue at exception handler (return address removed) // rax: exception // rbx: exception handler // rdx: throwing pc __ jmp(handler_addr); return start; } //---------------------------------------------------------------------------------------------------- // Support for jint Atomic::xchg(jint exchange_value, volatile jint* dest) // // xchg exists as far back as 8086, lock needed for MP only // Stack layout immediately after call: // // 0 [ret addr ] <--- rsp // 1 [ ex ] // 2 [ dest ] // // Result: *dest <- ex, return (old *dest) // // Note: win32 does not currently use this code address generate_atomic_xchg() { StubCodeMark mark(this, "StubRoutines", "atomic_xchg"); address start = __ pc(); __ push(rdx); Address exchange(rsp, 2 * wordSize); Address dest_addr(rsp, 3 * wordSize); __ movl(rax, exchange); __ movptr(rdx, dest_addr); __ xchgl(rax, Address(rdx, 0)); __ pop(rdx); __ ret(0); return start; } //---------------------------------------------------------------------------------------------------- // Support for void verify_mxcsr() // // This routine is used with -Xcheck:jni to verify that native // JNI code does not return to Java code without restoring the // MXCSR register to our expected state. address generate_verify_mxcsr() { StubCodeMark mark(this, "StubRoutines", "verify_mxcsr"); address start = __ pc(); const Address mxcsr_save(rsp, 0); if (CheckJNICalls && UseSSE > 0 ) { Label ok_ret; ExternalAddress mxcsr_std(StubRoutines::addr_mxcsr_std()); __ push(rax); __ subptr(rsp, wordSize); // allocate a temp location __ stmxcsr(mxcsr_save); __ movl(rax, mxcsr_save); __ andl(rax, MXCSR_MASK); __ cmp32(rax, mxcsr_std); __ jcc(Assembler::equal, ok_ret); __ warn("MXCSR changed by native JNI code."); __ ldmxcsr(mxcsr_std); __ bind(ok_ret); __ addptr(rsp, wordSize); __ pop(rax); } __ ret(0); return start; } //--------------------------------------------------------------------------- // Support for void verify_fpu_cntrl_wrd() // // This routine is used with -Xcheck:jni to verify that native // JNI code does not return to Java code without restoring the // FP control word to our expected state. address generate_verify_fpu_cntrl_wrd() { StubCodeMark mark(this, "StubRoutines", "verify_spcw"); address start = __ pc(); const Address fpu_cntrl_wrd_save(rsp, 0); if (CheckJNICalls) { Label ok_ret; __ push(rax); __ subptr(rsp, wordSize); // allocate a temp location __ fnstcw(fpu_cntrl_wrd_save); __ movl(rax, fpu_cntrl_wrd_save); __ andl(rax, FPU_CNTRL_WRD_MASK); ExternalAddress fpu_std(StubRoutines::addr_fpu_cntrl_wrd_std()); __ cmp32(rax, fpu_std); __ jcc(Assembler::equal, ok_ret); __ warn("Floating point control word changed by native JNI code."); __ fldcw(fpu_std); __ bind(ok_ret); __ addptr(rsp, wordSize); __ pop(rax); } __ ret(0); return start; } //--------------------------------------------------------------------------- // Wrapper for slow-case handling of double-to-integer conversion // d2i or f2i fast case failed either because it is nan or because // of under/overflow. // Input: FPU TOS: float value // Output: rax, (rdx): integer (long) result address generate_d2i_wrapper(BasicType t, address fcn) { StubCodeMark mark(this, "StubRoutines", "d2i_wrapper"); address start = __ pc(); // Capture info about frame layout enum layout { FPUState_off = 0, rbp_off = FPUStateSizeInWords, rdi_off, rsi_off, rcx_off, rbx_off, saved_argument_off, saved_argument_off2, // 2nd half of double framesize }; assert(FPUStateSizeInWords == 27, "update stack layout"); // Save outgoing argument to stack across push_FPU_state() __ subptr(rsp, wordSize * 2); __ fstp_d(Address(rsp, 0)); // Save CPU & FPU state __ push(rbx); __ push(rcx); __ push(rsi); __ push(rdi); __ push(rbp); __ push_FPU_state(); // push_FPU_state() resets the FP top of stack // Load original double into FP top of stack __ fld_d(Address(rsp, saved_argument_off * wordSize)); // Store double into stack as outgoing argument __ subptr(rsp, wordSize*2); __ fst_d(Address(rsp, 0)); // Prepare FPU for doing math in C-land __ empty_FPU_stack(); // Call the C code to massage the double. Result in EAX if (t == T_INT) { BLOCK_COMMENT("SharedRuntime::d2i"); } else if (t == T_LONG) { BLOCK_COMMENT("SharedRuntime::d2l"); } __ call_VM_leaf( fcn, 2 ); // Restore CPU & FPU state __ pop_FPU_state(); __ pop(rbp); __ pop(rdi); __ pop(rsi); __ pop(rcx); __ pop(rbx); __ addptr(rsp, wordSize * 2); __ ret(0); return start; } //--------------------------------------------------------------------------- // The following routine generates a subroutine to throw an asynchronous // UnknownError when an unsafe access gets a fault that could not be // reasonably prevented by the programmer. (Example: SIGBUS/OBJERR.) address generate_handler_for_unsafe_access() { StubCodeMark mark(this, "StubRoutines", "handler_for_unsafe_access"); address start = __ pc(); __ push(0); // hole for return address-to-be __ pusha(); // push registers Address next_pc(rsp, RegisterImpl::number_of_registers * BytesPerWord); BLOCK_COMMENT("call handle_unsafe_access"); __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, handle_unsafe_access))); __ movptr(next_pc, rax); // stuff next address __ popa(); __ ret(0); // jump to next address return start; } //---------------------------------------------------------------------------------------------------- // Non-destructive plausibility checks for oops address generate_verify_oop() { StubCodeMark mark(this, "StubRoutines", "verify_oop"); address start = __ pc(); // Incoming arguments on stack after saving rax,: // // [tos ]: saved rdx // [tos + 1]: saved EFLAGS // [tos + 2]: return address // [tos + 3]: char* error message // [tos + 4]: oop object to verify // [tos + 5]: saved rax, - saved by caller and bashed Label exit, error; __ pushf(); __ incrementl(ExternalAddress((address) StubRoutines::verify_oop_count_addr())); __ push(rdx); // save rdx // make sure object is 'reasonable' __ movptr(rax, Address(rsp, 4 * wordSize)); // get object __ testptr(rax, rax); __ jcc(Assembler::zero, exit); // if obj is NULL it is ok // Check if the oop is in the right area of memory const int oop_mask = Universe::verify_oop_mask(); const int oop_bits = Universe::verify_oop_bits(); __ mov(rdx, rax); __ andptr(rdx, oop_mask); __ cmpptr(rdx, oop_bits); __ jcc(Assembler::notZero, error); // make sure klass is 'reasonable' __ movptr(rax, Address(rax, oopDesc::klass_offset_in_bytes())); // get klass __ testptr(rax, rax); __ jcc(Assembler::zero, error); // if klass is NULL it is broken // Check if the klass is in the right area of memory const int klass_mask = Universe::verify_klass_mask(); const int klass_bits = Universe::verify_klass_bits(); __ mov(rdx, rax); __ andptr(rdx, klass_mask); __ cmpptr(rdx, klass_bits); __ jcc(Assembler::notZero, error); // make sure klass' klass is 'reasonable' __ movptr(rax, Address(rax, oopDesc::klass_offset_in_bytes())); // get klass' klass __ testptr(rax, rax); __ jcc(Assembler::zero, error); // if klass' klass is NULL it is broken __ mov(rdx, rax); __ andptr(rdx, klass_mask); __ cmpptr(rdx, klass_bits); __ jcc(Assembler::notZero, error); // if klass not in right area // of memory it is broken too. // return if everything seems ok __ bind(exit); __ movptr(rax, Address(rsp, 5 * wordSize)); // get saved rax, back __ pop(rdx); // restore rdx __ popf(); // restore EFLAGS __ ret(3 * wordSize); // pop arguments // handle errors __ bind(error); __ movptr(rax, Address(rsp, 5 * wordSize)); // get saved rax, back __ pop(rdx); // get saved rdx back __ popf(); // get saved EFLAGS off stack -- will be ignored __ pusha(); // push registers (eip = return address & msg are already pushed) BLOCK_COMMENT("call MacroAssembler::debug"); __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, MacroAssembler::debug32))); __ popa(); __ ret(3 * wordSize); // pop arguments return start; } // // Generate pre-barrier for array stores // // Input: // start - starting address // count - element count void gen_write_ref_array_pre_barrier(Register start, Register count) { assert_different_registers(start, count); BarrierSet* bs = Universe::heap()->barrier_set(); switch (bs->kind()) { case BarrierSet::G1SATBCT: case BarrierSet::G1SATBCTLogging: { __ pusha(); // push registers __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_pre), start, count); __ popa(); } break; case BarrierSet::CardTableModRef: case BarrierSet::CardTableExtension: case BarrierSet::ModRef: break; default : ShouldNotReachHere(); } } // // Generate a post-barrier for an array store // // start - starting address // count - element count // // The two input registers are overwritten. // void gen_write_ref_array_post_barrier(Register start, Register count) { BarrierSet* bs = Universe::heap()->barrier_set(); assert_different_registers(start, count); switch (bs->kind()) { case BarrierSet::G1SATBCT: case BarrierSet::G1SATBCTLogging: { __ pusha(); // push registers __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_post), start, count); __ popa(); } break; case BarrierSet::CardTableModRef: case BarrierSet::CardTableExtension: { CardTableModRefBS* ct = (CardTableModRefBS*)bs; assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); Label L_loop; const Register end = count; // elements count; end == start+count-1 assert_different_registers(start, end); __ lea(end, Address(start, count, Address::times_ptr, -wordSize)); __ shrptr(start, CardTableModRefBS::card_shift); __ shrptr(end, CardTableModRefBS::card_shift); __ subptr(end, start); // end --> count __ BIND(L_loop); intptr_t disp = (intptr_t) ct->byte_map_base; Address cardtable(start, count, Address::times_1, disp); __ movb(cardtable, 0); __ decrement(count); __ jcc(Assembler::greaterEqual, L_loop); } break; case BarrierSet::ModRef: break; default : ShouldNotReachHere(); } } // Copy 64 bytes chunks // // Inputs: // from - source array address // to_from - destination array address - from // qword_count - 8-bytes element count, negative // void xmm_copy_forward(Register from, Register to_from, Register qword_count) { assert( UseSSE >= 2, "supported cpu only" ); Label L_copy_64_bytes_loop, L_copy_64_bytes, L_copy_8_bytes, L_exit; // Copy 64-byte chunks __ jmpb(L_copy_64_bytes); __ align(OptoLoopAlignment); __ BIND(L_copy_64_bytes_loop); if(UseUnalignedLoadStores) { __ movdqu(xmm0, Address(from, 0)); __ movdqu(Address(from, to_from, Address::times_1, 0), xmm0); __ movdqu(xmm1, Address(from, 16)); __ movdqu(Address(from, to_from, Address::times_1, 16), xmm1); __ movdqu(xmm2, Address(from, 32)); __ movdqu(Address(from, to_from, Address::times_1, 32), xmm2); __ movdqu(xmm3, Address(from, 48)); __ movdqu(Address(from, to_from, Address::times_1, 48), xmm3); } else { __ movq(xmm0, Address(from, 0)); __ movq(Address(from, to_from, Address::times_1, 0), xmm0); __ movq(xmm1, Address(from, 8)); __ movq(Address(from, to_from, Address::times_1, 8), xmm1); __ movq(xmm2, Address(from, 16)); __ movq(Address(from, to_from, Address::times_1, 16), xmm2); __ movq(xmm3, Address(from, 24)); __ movq(Address(from, to_from, Address::times_1, 24), xmm3); __ movq(xmm4, Address(from, 32)); __ movq(Address(from, to_from, Address::times_1, 32), xmm4); __ movq(xmm5, Address(from, 40)); __ movq(Address(from, to_from, Address::times_1, 40), xmm5); __ movq(xmm6, Address(from, 48)); __ movq(Address(from, to_from, Address::times_1, 48), xmm6); __ movq(xmm7, Address(from, 56)); __ movq(Address(from, to_from, Address::times_1, 56), xmm7); } __ addl(from, 64); __ BIND(L_copy_64_bytes); __ subl(qword_count, 8); __ jcc(Assembler::greaterEqual, L_copy_64_bytes_loop); __ addl(qword_count, 8); __ jccb(Assembler::zero, L_exit); // // length is too short, just copy qwords // __ BIND(L_copy_8_bytes); __ movq(xmm0, Address(from, 0)); __ movq(Address(from, to_from, Address::times_1), xmm0); __ addl(from, 8); __ decrement(qword_count); __ jcc(Assembler::greater, L_copy_8_bytes); __ BIND(L_exit); } // Copy 64 bytes chunks // // Inputs: // from - source array address // to_from - destination array address - from // qword_count - 8-bytes element count, negative // void mmx_copy_forward(Register from, Register to_from, Register qword_count) { assert( VM_Version::supports_mmx(), "supported cpu only" ); Label L_copy_64_bytes_loop, L_copy_64_bytes, L_copy_8_bytes, L_exit; // Copy 64-byte chunks __ jmpb(L_copy_64_bytes); __ align(OptoLoopAlignment); __ BIND(L_copy_64_bytes_loop); __ movq(mmx0, Address(from, 0)); __ movq(mmx1, Address(from, 8)); __ movq(mmx2, Address(from, 16)); __ movq(Address(from, to_from, Address::times_1, 0), mmx0); __ movq(mmx3, Address(from, 24)); __ movq(Address(from, to_from, Address::times_1, 8), mmx1); __ movq(mmx4, Address(from, 32)); __ movq(Address(from, to_from, Address::times_1, 16), mmx2); __ movq(mmx5, Address(from, 40)); __ movq(Address(from, to_from, Address::times_1, 24), mmx3); __ movq(mmx6, Address(from, 48)); __ movq(Address(from, to_from, Address::times_1, 32), mmx4); __ movq(mmx7, Address(from, 56)); __ movq(Address(from, to_from, Address::times_1, 40), mmx5); __ movq(Address(from, to_from, Address::times_1, 48), mmx6); __ movq(Address(from, to_from, Address::times_1, 56), mmx7); __ addptr(from, 64); __ BIND(L_copy_64_bytes); __ subl(qword_count, 8); __ jcc(Assembler::greaterEqual, L_copy_64_bytes_loop); __ addl(qword_count, 8); __ jccb(Assembler::zero, L_exit); // // length is too short, just copy qwords // __ BIND(L_copy_8_bytes); __ movq(mmx0, Address(from, 0)); __ movq(Address(from, to_from, Address::times_1), mmx0); __ addptr(from, 8); __ decrement(qword_count); __ jcc(Assembler::greater, L_copy_8_bytes); __ BIND(L_exit); __ emms(); } address generate_disjoint_copy(BasicType t, bool aligned, Address::ScaleFactor sf, address* entry, const char *name, bool need_pre_barrier = true) { __ align(CodeEntryAlignment); StubCodeMark mark(this, "StubRoutines", name); address start = __ pc(); Label L_0_count, L_exit, L_skip_align1, L_skip_align2, L_copy_byte; Label L_copy_2_bytes, L_copy_4_bytes, L_copy_64_bytes; int shift = Address::times_ptr - sf; const Register from = rsi; // source array address const Register to = rdi; // destination array address const Register count = rcx; // elements count const Register to_from = to; // (to - from) const Register saved_to = rdx; // saved destination array address __ enter(); // required for proper stackwalking of RuntimeStub frame __ push(rsi); __ push(rdi); __ movptr(from , Address(rsp, 12+ 4)); __ movptr(to , Address(rsp, 12+ 8)); __ movl(count, Address(rsp, 12+ 12)); if (entry != NULL) { *entry = __ pc(); // Entry point from conjoint arraycopy stub. BLOCK_COMMENT("Entry:"); } if (t == T_OBJECT) { __ testl(count, count); __ jcc(Assembler::zero, L_0_count); if (need_pre_barrier) { gen_write_ref_array_pre_barrier(to, count); } __ mov(saved_to, to); // save 'to' } __ subptr(to, from); // to --> to_from __ cmpl(count, 2< to_from if (VM_Version::supports_mmx()) { if (UseXMMForArrayCopy) { xmm_copy_forward(from, to_from, count); } else { mmx_copy_forward(from, to_from, count); } } else { __ jmpb(L_copy_8_bytes); __ align(OptoLoopAlignment); __ BIND(L_copy_8_bytes_loop); __ fild_d(Address(from, 0)); __ fistp_d(Address(from, to_from, Address::times_1)); __ addptr(from, 8); __ BIND(L_copy_8_bytes); __ decrement(count); __ jcc(Assembler::greaterEqual, L_copy_8_bytes_loop); } inc_copy_counter_np(T_LONG); __ leave(); // required for proper stackwalking of RuntimeStub frame __ xorptr(rax, rax); // return 0 __ ret(0); return start; } address generate_conjoint_long_copy(address nooverlap_target, address* entry, const char *name) { __ align(CodeEntryAlignment); StubCodeMark mark(this, "StubRoutines", name); address start = __ pc(); Label L_copy_8_bytes, L_copy_8_bytes_loop; const Register from = rax; // source array address const Register to = rdx; // destination array address const Register count = rcx; // elements count const Register end_from = rax; // source array end address __ enter(); // required for proper stackwalking of RuntimeStub frame __ movptr(from , Address(rsp, 8+0)); // from __ movptr(to , Address(rsp, 8+4)); // to __ movl2ptr(count, Address(rsp, 8+8)); // count *entry = __ pc(); // Entry point from generic arraycopy stub. BLOCK_COMMENT("Entry:"); // arrays overlap test __ cmpptr(to, from); RuntimeAddress nooverlap(nooverlap_target); __ jump_cc(Assembler::belowEqual, nooverlap); __ lea(end_from, Address(from, count, Address::times_8, 0)); __ cmpptr(to, end_from); __ movptr(from, Address(rsp, 8)); // from __ jump_cc(Assembler::aboveEqual, nooverlap); __ jmpb(L_copy_8_bytes); __ align(OptoLoopAlignment); __ BIND(L_copy_8_bytes_loop); if (VM_Version::supports_mmx()) { if (UseXMMForArrayCopy) { __ movq(xmm0, Address(from, count, Address::times_8)); __ movq(Address(to, count, Address::times_8), xmm0); } else { __ movq(mmx0, Address(from, count, Address::times_8)); __ movq(Address(to, count, Address::times_8), mmx0); } } else { __ fild_d(Address(from, count, Address::times_8)); __ fistp_d(Address(to, count, Address::times_8)); } __ BIND(L_copy_8_bytes); __ decrement(count); __ jcc(Assembler::greaterEqual, L_copy_8_bytes_loop); if (VM_Version::supports_mmx() && !UseXMMForArrayCopy) { __ emms(); } inc_copy_counter_np(T_LONG); __ leave(); // required for proper stackwalking of RuntimeStub frame __ xorptr(rax, rax); // return 0 __ ret(0); return start; } // Helper for generating a dynamic type check. // The sub_klass must be one of {rbx, rdx, rsi}. // The temp is killed. void generate_type_check(Register sub_klass, Address& super_check_offset_addr, Address& super_klass_addr, Register temp, Label* L_success, Label* L_failure) { BLOCK_COMMENT("type_check:"); Label L_fallthrough; #define LOCAL_JCC(assembler_con, label_ptr) \ if (label_ptr != NULL) __ jcc(assembler_con, *(label_ptr)); \ else __ jcc(assembler_con, L_fallthrough) /*omit semi*/ // The following is a strange variation of the fast path which requires // one less register, because needed values are on the argument stack. // __ check_klass_subtype_fast_path(sub_klass, *super_klass*, temp, // L_success, L_failure, NULL); assert_different_registers(sub_klass, temp); int sc_offset = (klassOopDesc::header_size() * HeapWordSize + Klass::secondary_super_cache_offset_in_bytes()); // if the pointers are equal, we are done (e.g., String[] elements) __ cmpptr(sub_klass, super_klass_addr); LOCAL_JCC(Assembler::equal, L_success); // check the supertype display: __ movl2ptr(temp, super_check_offset_addr); Address super_check_addr(sub_klass, temp, Address::times_1, 0); __ movptr(temp, super_check_addr); // load displayed supertype __ cmpptr(temp, super_klass_addr); // test the super type LOCAL_JCC(Assembler::equal, L_success); // if it was a primary super, we can just fail immediately __ cmpl(super_check_offset_addr, sc_offset); LOCAL_JCC(Assembler::notEqual, L_failure); // The repne_scan instruction uses fixed registers, which will get spilled. // We happen to know this works best when super_klass is in rax. Register super_klass = temp; __ movptr(super_klass, super_klass_addr); __ check_klass_subtype_slow_path(sub_klass, super_klass, noreg, noreg, L_success, L_failure); __ bind(L_fallthrough); if (L_success == NULL) { BLOCK_COMMENT("L_success:"); } if (L_failure == NULL) { BLOCK_COMMENT("L_failure:"); } #undef LOCAL_JCC } // // Generate checkcasting array copy stub // // Input: // 4(rsp) - source array address // 8(rsp) - destination array address // 12(rsp) - element count, can be zero // 16(rsp) - size_t ckoff (super_check_offset) // 20(rsp) - oop ckval (super_klass) // // Output: // rax, == 0 - success // rax, == -1^K - failure, where K is partial transfer count // address generate_checkcast_copy(const char *name, address* entry, bool need_pre_barrier = true) { __ align(CodeEntryAlignment); StubCodeMark mark(this, "StubRoutines", name); address start = __ pc(); Label L_load_element, L_store_element, L_do_card_marks, L_done; // register use: // rax, rdx, rcx -- loop control (end_from, end_to, count) // rdi, rsi -- element access (oop, klass) // rbx, -- temp const Register from = rax; // source array address const Register to = rdx; // destination array address const Register length = rcx; // elements count const Register elem = rdi; // each oop copied const Register elem_klass = rsi; // each elem._klass (sub_klass) const Register temp = rbx; // lone remaining temp __ enter(); // required for proper stackwalking of RuntimeStub frame __ push(rsi); __ push(rdi); __ push(rbx); Address from_arg(rsp, 16+ 4); // from Address to_arg(rsp, 16+ 8); // to Address length_arg(rsp, 16+12); // elements count Address ckoff_arg(rsp, 16+16); // super_check_offset Address ckval_arg(rsp, 16+20); // super_klass // Load up: __ movptr(from, from_arg); __ movptr(to, to_arg); __ movl2ptr(length, length_arg); if (entry != NULL) { *entry = __ pc(); // Entry point from generic arraycopy stub. BLOCK_COMMENT("Entry:"); } //--------------------------------------------------------------- // Assembler stub will be used for this call to arraycopy // if the two arrays are subtypes of Object[] but the // destination array type is not equal to or a supertype // of the source type. Each element must be separately // checked. // Loop-invariant addresses. They are exclusive end pointers. Address end_from_addr(from, length, Address::times_ptr, 0); Address end_to_addr(to, length, Address::times_ptr, 0); Register end_from = from; // re-use Register end_to = to; // re-use Register count = length; // re-use // Loop-variant addresses. They assume post-incremented count < 0. Address from_element_addr(end_from, count, Address::times_ptr, 0); Address to_element_addr(end_to, count, Address::times_ptr, 0); Address elem_klass_addr(elem, oopDesc::klass_offset_in_bytes()); // Copy from low to high addresses, indexed from the end of each array. if (need_pre_barrier) { gen_write_ref_array_pre_barrier(to, count); } __ lea(end_from, end_from_addr); __ lea(end_to, end_to_addr); assert(length == count, ""); // else fix next line: __ negptr(count); // negate and test the length __ jccb(Assembler::notZero, L_load_element); // Empty array: Nothing to do. __ xorptr(rax, rax); // return 0 on (trivial) success __ jmp(L_done); // ======== begin loop ======== // (Loop is rotated; its entry is L_load_element.) // Loop control: // for (count = -count; count != 0; count++) // Base pointers src, dst are biased by 8*count,to last element. __ align(OptoLoopAlignment); __ BIND(L_store_element); __ movptr(to_element_addr, elem); // store the oop __ increment(count); // increment the count toward zero __ jccb(Assembler::zero, L_do_card_marks); // ======== loop entry is here ======== __ BIND(L_load_element); __ movptr(elem, from_element_addr); // load the oop __ testptr(elem, elem); __ jccb(Assembler::zero, L_store_element); // (Could do a trick here: Remember last successful non-null // element stored and make a quick oop equality check on it.) __ movptr(elem_klass, elem_klass_addr); // query the object klass generate_type_check(elem_klass, ckoff_arg, ckval_arg, temp, &L_store_element, NULL); // (On fall-through, we have failed the element type check.) // ======== end loop ======== // It was a real error; we must depend on the caller to finish the job. // Register "count" = -1 * number of *remaining* oops, length_arg = *total* oops. // Emit GC store barriers for the oops we have copied (length_arg + count), // and report their number to the caller. __ addl(count, length_arg); // transfers = (length - remaining) __ movl2ptr(rax, count); // save the value __ notptr(rax); // report (-1^K) to caller __ movptr(to, to_arg); // reload assert_different_registers(to, count, rax); gen_write_ref_array_post_barrier(to, count); __ jmpb(L_done); // Come here on success only. __ BIND(L_do_card_marks); __ movl2ptr(count, length_arg); __ movptr(to, to_arg); // reload gen_write_ref_array_post_barrier(to, count); __ xorptr(rax, rax); // return 0 on success // Common exit point (success or failure). __ BIND(L_done); __ pop(rbx); __ pop(rdi); __ pop(rsi); inc_counter_np(SharedRuntime::_checkcast_array_copy_ctr); __ leave(); // required for proper stackwalking of RuntimeStub frame __ ret(0); return start; } // // Generate 'unsafe' array copy stub // Though just as safe as the other stubs, it takes an unscaled // size_t argument instead of an element count. // // Input: // 4(rsp) - source array address // 8(rsp) - destination array address // 12(rsp) - byte count, can be zero // // Output: // rax, == 0 - success // rax, == -1 - need to call System.arraycopy // // Examines the alignment of the operands and dispatches // to a long, int, short, or byte copy loop. // address generate_unsafe_copy(const char *name, address byte_copy_entry, address short_copy_entry, address int_copy_entry, address long_copy_entry) { Label L_long_aligned, L_int_aligned, L_short_aligned; __ align(CodeEntryAlignment); StubCodeMark mark(this, "StubRoutines", name); address start = __ pc(); const Register from = rax; // source array address const Register to = rdx; // destination array address const Register count = rcx; // elements count __ enter(); // required for proper stackwalking of RuntimeStub frame __ push(rsi); __ push(rdi); Address from_arg(rsp, 12+ 4); // from Address to_arg(rsp, 12+ 8); // to Address count_arg(rsp, 12+12); // byte count // Load up: __ movptr(from , from_arg); __ movptr(to , to_arg); __ movl2ptr(count, count_arg); // bump this on entry, not on exit: inc_counter_np(SharedRuntime::_unsafe_array_copy_ctr); const Register bits = rsi; __ mov(bits, from); __ orptr(bits, to); __ orptr(bits, count); __ testl(bits, BytesPerLong-1); __ jccb(Assembler::zero, L_long_aligned); __ testl(bits, BytesPerInt-1); __ jccb(Assembler::zero, L_int_aligned); __ testl(bits, BytesPerShort-1); __ jump_cc(Assembler::notZero, RuntimeAddress(byte_copy_entry)); __ BIND(L_short_aligned); __ shrptr(count, LogBytesPerShort); // size => short_count __ movl(count_arg, count); // update 'count' __ jump(RuntimeAddress(short_copy_entry)); __ BIND(L_int_aligned); __ shrptr(count, LogBytesPerInt); // size => int_count __ movl(count_arg, count); // update 'count' __ jump(RuntimeAddress(int_copy_entry)); __ BIND(L_long_aligned); __ shrptr(count, LogBytesPerLong); // size => qword_count __ movl(count_arg, count); // update 'count' __ pop(rdi); // Do pops here since jlong_arraycopy stub does not do it. __ pop(rsi); __ jump(RuntimeAddress(long_copy_entry)); return start; } // Perform range checks on the proposed arraycopy. // Smashes src_pos and dst_pos. (Uses them up for temps.) void arraycopy_range_checks(Register src, Register src_pos, Register dst, Register dst_pos, Address& length, Label& L_failed) { BLOCK_COMMENT("arraycopy_range_checks:"); const Register src_end = src_pos; // source array end position const Register dst_end = dst_pos; // destination array end position __ addl(src_end, length); // src_pos + length __ addl(dst_end, length); // dst_pos + length // if (src_pos + length > arrayOop(src)->length() ) FAIL; __ cmpl(src_end, Address(src, arrayOopDesc::length_offset_in_bytes())); __ jcc(Assembler::above, L_failed); // if (dst_pos + length > arrayOop(dst)->length() ) FAIL; __ cmpl(dst_end, Address(dst, arrayOopDesc::length_offset_in_bytes())); __ jcc(Assembler::above, L_failed); BLOCK_COMMENT("arraycopy_range_checks done"); } // // Generate generic array copy stubs // // Input: // 4(rsp) - src oop // 8(rsp) - src_pos // 12(rsp) - dst oop // 16(rsp) - dst_pos // 20(rsp) - element count // // Output: // rax, == 0 - success // rax, == -1^K - failure, where K is partial transfer count // address generate_generic_copy(const char *name, address entry_jbyte_arraycopy, address entry_jshort_arraycopy, address entry_jint_arraycopy, address entry_oop_arraycopy, address entry_jlong_arraycopy, address entry_checkcast_arraycopy) { Label L_failed, L_failed_0, L_objArray; { int modulus = CodeEntryAlignment; int target = modulus - 5; // 5 = sizeof jmp(L_failed) int advance = target - (__ offset() % modulus); if (advance < 0) advance += modulus; if (advance > 0) __ nop(advance); } StubCodeMark mark(this, "StubRoutines", name); // Short-hop target to L_failed. Makes for denser prologue code. __ BIND(L_failed_0); __ jmp(L_failed); assert(__ offset() % CodeEntryAlignment == 0, "no further alignment needed"); __ align(CodeEntryAlignment); address start = __ pc(); __ enter(); // required for proper stackwalking of RuntimeStub frame __ push(rsi); __ push(rdi); // bump this on entry, not on exit: inc_counter_np(SharedRuntime::_generic_array_copy_ctr); // Input values Address SRC (rsp, 12+ 4); Address SRC_POS (rsp, 12+ 8); Address DST (rsp, 12+12); Address DST_POS (rsp, 12+16); Address LENGTH (rsp, 12+20); //----------------------------------------------------------------------- // Assembler stub will be used for this call to arraycopy // if the following conditions are met: // // (1) src and dst must not be null. // (2) src_pos must not be negative. // (3) dst_pos must not be negative. // (4) length must not be negative. // (5) src klass and dst klass should be the same and not NULL. // (6) src and dst should be arrays. // (7) src_pos + length must not exceed length of src. // (8) dst_pos + length must not exceed length of dst. // const Register src = rax; // source array oop const Register src_pos = rsi; const Register dst = rdx; // destination array oop const Register dst_pos = rdi; const Register length = rcx; // transfer count // if (src == NULL) return -1; __ movptr(src, SRC); // src oop __ testptr(src, src); __ jccb(Assembler::zero, L_failed_0); // if (src_pos < 0) return -1; __ movl2ptr(src_pos, SRC_POS); // src_pos __ testl(src_pos, src_pos); __ jccb(Assembler::negative, L_failed_0); // if (dst == NULL) return -1; __ movptr(dst, DST); // dst oop __ testptr(dst, dst); __ jccb(Assembler::zero, L_failed_0); // if (dst_pos < 0) return -1; __ movl2ptr(dst_pos, DST_POS); // dst_pos __ testl(dst_pos, dst_pos); __ jccb(Assembler::negative, L_failed_0); // if (length < 0) return -1; __ movl2ptr(length, LENGTH); // length __ testl(length, length); __ jccb(Assembler::negative, L_failed_0); // if (src->klass() == NULL) return -1; Address src_klass_addr(src, oopDesc::klass_offset_in_bytes()); Address dst_klass_addr(dst, oopDesc::klass_offset_in_bytes()); const Register rcx_src_klass = rcx; // array klass __ movptr(rcx_src_klass, Address(src, oopDesc::klass_offset_in_bytes())); #ifdef ASSERT // assert(src->klass() != NULL); BLOCK_COMMENT("assert klasses not null"); { Label L1, L2; __ testptr(rcx_src_klass, rcx_src_klass); __ jccb(Assembler::notZero, L2); // it is broken if klass is NULL __ bind(L1); __ stop("broken null klass"); __ bind(L2); __ cmpptr(dst_klass_addr, (int32_t)NULL_WORD); __ jccb(Assembler::equal, L1); // this would be broken also BLOCK_COMMENT("assert done"); } #endif //ASSERT // Load layout helper (32-bits) // // |array_tag| | header_size | element_type | |log2_element_size| // 32 30 24 16 8 2 0 // // array_tag: typeArray = 0x3, objArray = 0x2, non-array = 0x0 // int lh_offset = klassOopDesc::header_size() * HeapWordSize + Klass::layout_helper_offset_in_bytes(); Address src_klass_lh_addr(rcx_src_klass, lh_offset); // Handle objArrays completely differently... jint objArray_lh = Klass::array_layout_helper(T_OBJECT); __ cmpl(src_klass_lh_addr, objArray_lh); __ jcc(Assembler::equal, L_objArray); // if (src->klass() != dst->klass()) return -1; __ cmpptr(rcx_src_klass, dst_klass_addr); __ jccb(Assembler::notEqual, L_failed_0); const Register rcx_lh = rcx; // layout helper assert(rcx_lh == rcx_src_klass, "known alias"); __ movl(rcx_lh, src_klass_lh_addr); // if (!src->is_Array()) return -1; __ cmpl(rcx_lh, Klass::_lh_neutral_value); __ jcc(Assembler::greaterEqual, L_failed_0); // signed cmp // At this point, it is known to be a typeArray (array_tag 0x3). #ifdef ASSERT { Label L; __ cmpl(rcx_lh, (Klass::_lh_array_tag_type_value << Klass::_lh_array_tag_shift)); __ jcc(Assembler::greaterEqual, L); // signed cmp __ stop("must be a primitive array"); __ bind(L); } #endif assert_different_registers(src, src_pos, dst, dst_pos, rcx_lh); arraycopy_range_checks(src, src_pos, dst, dst_pos, LENGTH, L_failed); // typeArrayKlass // // src_addr = (src + array_header_in_bytes()) + (src_pos << log2elemsize); // dst_addr = (dst + array_header_in_bytes()) + (dst_pos << log2elemsize); // const Register rsi_offset = rsi; // array offset const Register src_array = src; // src array offset const Register dst_array = dst; // dst array offset const Register rdi_elsize = rdi; // log2 element size __ mov(rsi_offset, rcx_lh); __ shrptr(rsi_offset, Klass::_lh_header_size_shift); __ andptr(rsi_offset, Klass::_lh_header_size_mask); // array_offset __ addptr(src_array, rsi_offset); // src array offset __ addptr(dst_array, rsi_offset); // dst array offset __ andptr(rcx_lh, Klass::_lh_log2_element_size_mask); // log2 elsize // next registers should be set before the jump to corresponding stub const Register from = src; // source array address const Register to = dst; // destination array address const Register count = rcx; // elements count // some of them should be duplicated on stack #define FROM Address(rsp, 12+ 4) #define TO Address(rsp, 12+ 8) // Not used now #define COUNT Address(rsp, 12+12) // Only for oop arraycopy BLOCK_COMMENT("scale indexes to element size"); __ movl2ptr(rsi, SRC_POS); // src_pos __ shlptr(rsi); // src_pos << rcx (log2 elsize) assert(src_array == from, ""); __ addptr(from, rsi); // from = src_array + SRC_POS << log2 elsize __ movl2ptr(rdi, DST_POS); // dst_pos __ shlptr(rdi); // dst_pos << rcx (log2 elsize) assert(dst_array == to, ""); __ addptr(to, rdi); // to = dst_array + DST_POS << log2 elsize __ movptr(FROM, from); // src_addr __ mov(rdi_elsize, rcx_lh); // log2 elsize __ movl2ptr(count, LENGTH); // elements count BLOCK_COMMENT("choose copy loop based on element size"); __ cmpl(rdi_elsize, 0); __ jump_cc(Assembler::equal, RuntimeAddress(entry_jbyte_arraycopy)); __ cmpl(rdi_elsize, LogBytesPerShort); __ jump_cc(Assembler::equal, RuntimeAddress(entry_jshort_arraycopy)); __ cmpl(rdi_elsize, LogBytesPerInt); __ jump_cc(Assembler::equal, RuntimeAddress(entry_jint_arraycopy)); #ifdef ASSERT __ cmpl(rdi_elsize, LogBytesPerLong); __ jccb(Assembler::notEqual, L_failed); #endif __ pop(rdi); // Do pops here since jlong_arraycopy stub does not do it. __ pop(rsi); __ jump(RuntimeAddress(entry_jlong_arraycopy)); __ BIND(L_failed); __ xorptr(rax, rax); __ notptr(rax); // return -1 __ pop(rdi); __ pop(rsi); __ leave(); // required for proper stackwalking of RuntimeStub frame __ ret(0); // objArrayKlass __ BIND(L_objArray); // live at this point: rcx_src_klass, src[_pos], dst[_pos] Label L_plain_copy, L_checkcast_copy; // test array classes for subtyping __ cmpptr(rcx_src_klass, dst_klass_addr); // usual case is exact equality __ jccb(Assembler::notEqual, L_checkcast_copy); // Identically typed arrays can be copied without element-wise checks. assert_different_registers(src, src_pos, dst, dst_pos, rcx_src_klass); arraycopy_range_checks(src, src_pos, dst, dst_pos, LENGTH, L_failed); __ BIND(L_plain_copy); __ movl2ptr(count, LENGTH); // elements count __ movl2ptr(src_pos, SRC_POS); // reload src_pos __ lea(from, Address(src, src_pos, Address::times_ptr, arrayOopDesc::base_offset_in_bytes(T_OBJECT))); // src_addr __ movl2ptr(dst_pos, DST_POS); // reload dst_pos __ lea(to, Address(dst, dst_pos, Address::times_ptr, arrayOopDesc::base_offset_in_bytes(T_OBJECT))); // dst_addr __ movptr(FROM, from); // src_addr __ movptr(TO, to); // dst_addr __ movl(COUNT, count); // count __ jump(RuntimeAddress(entry_oop_arraycopy)); __ BIND(L_checkcast_copy); // live at this point: rcx_src_klass, dst[_pos], src[_pos] { // Handy offsets: int ek_offset = (klassOopDesc::header_size() * HeapWordSize + objArrayKlass::element_klass_offset_in_bytes()); int sco_offset = (klassOopDesc::header_size() * HeapWordSize + Klass::super_check_offset_offset_in_bytes()); Register rsi_dst_klass = rsi; Register rdi_temp = rdi; assert(rsi_dst_klass == src_pos, "expected alias w/ src_pos"); assert(rdi_temp == dst_pos, "expected alias w/ dst_pos"); Address dst_klass_lh_addr(rsi_dst_klass, lh_offset); // Before looking at dst.length, make sure dst is also an objArray. __ movptr(rsi_dst_klass, dst_klass_addr); __ cmpl(dst_klass_lh_addr, objArray_lh); __ jccb(Assembler::notEqual, L_failed); // It is safe to examine both src.length and dst.length. __ movl2ptr(src_pos, SRC_POS); // reload rsi arraycopy_range_checks(src, src_pos, dst, dst_pos, LENGTH, L_failed); // (Now src_pos and dst_pos are killed, but not src and dst.) // We'll need this temp (don't forget to pop it after the type check). __ push(rbx); Register rbx_src_klass = rbx; __ mov(rbx_src_klass, rcx_src_klass); // spill away from rcx __ movptr(rsi_dst_klass, dst_klass_addr); Address super_check_offset_addr(rsi_dst_klass, sco_offset); Label L_fail_array_check; generate_type_check(rbx_src_klass, super_check_offset_addr, dst_klass_addr, rdi_temp, NULL, &L_fail_array_check); // (On fall-through, we have passed the array type check.) __ pop(rbx); __ jmp(L_plain_copy); __ BIND(L_fail_array_check); // Reshuffle arguments so we can call checkcast_arraycopy: // match initial saves for checkcast_arraycopy // push(rsi); // already done; see above // push(rdi); // already done; see above // push(rbx); // already done; see above // Marshal outgoing arguments now, freeing registers. Address from_arg(rsp, 16+ 4); // from Address to_arg(rsp, 16+ 8); // to Address length_arg(rsp, 16+12); // elements count Address ckoff_arg(rsp, 16+16); // super_check_offset Address ckval_arg(rsp, 16+20); // super_klass Address SRC_POS_arg(rsp, 16+ 8); Address DST_POS_arg(rsp, 16+16); Address LENGTH_arg(rsp, 16+20); // push rbx, changed the incoming offsets (why not just use rbp,??) // assert(SRC_POS_arg.disp() == SRC_POS.disp() + 4, ""); __ movptr(rbx, Address(rsi_dst_klass, ek_offset)); __ movl2ptr(length, LENGTH_arg); // reload elements count __ movl2ptr(src_pos, SRC_POS_arg); // reload src_pos __ movl2ptr(dst_pos, DST_POS_arg); // reload dst_pos __ movptr(ckval_arg, rbx); // destination element type __ movl(rbx, Address(rbx, sco_offset)); __ movl(ckoff_arg, rbx); // corresponding class check offset __ movl(length_arg, length); // outgoing length argument __ lea(from, Address(src, src_pos, Address::times_ptr, arrayOopDesc::base_offset_in_bytes(T_OBJECT))); __ movptr(from_arg, from); __ lea(to, Address(dst, dst_pos, Address::times_ptr, arrayOopDesc::base_offset_in_bytes(T_OBJECT))); __ movptr(to_arg, to); __ jump(RuntimeAddress(entry_checkcast_arraycopy)); } return start; } void generate_arraycopy_stubs() { address entry; address entry_jbyte_arraycopy; address entry_jshort_arraycopy; address entry_jint_arraycopy; address entry_oop_arraycopy; address entry_jlong_arraycopy; address entry_checkcast_arraycopy; StubRoutines::_arrayof_jbyte_disjoint_arraycopy = generate_disjoint_copy(T_BYTE, true, Address::times_1, &entry, "arrayof_jbyte_disjoint_arraycopy"); StubRoutines::_arrayof_jbyte_arraycopy = generate_conjoint_copy(T_BYTE, true, Address::times_1, entry, NULL, "arrayof_jbyte_arraycopy"); StubRoutines::_jbyte_disjoint_arraycopy = generate_disjoint_copy(T_BYTE, false, Address::times_1, &entry, "jbyte_disjoint_arraycopy"); StubRoutines::_jbyte_arraycopy = generate_conjoint_copy(T_BYTE, false, Address::times_1, entry, &entry_jbyte_arraycopy, "jbyte_arraycopy"); StubRoutines::_arrayof_jshort_disjoint_arraycopy = generate_disjoint_copy(T_SHORT, true, Address::times_2, &entry, "arrayof_jshort_disjoint_arraycopy"); StubRoutines::_arrayof_jshort_arraycopy = generate_conjoint_copy(T_SHORT, true, Address::times_2, entry, NULL, "arrayof_jshort_arraycopy"); StubRoutines::_jshort_disjoint_arraycopy = generate_disjoint_copy(T_SHORT, false, Address::times_2, &entry, "jshort_disjoint_arraycopy"); StubRoutines::_jshort_arraycopy = generate_conjoint_copy(T_SHORT, false, Address::times_2, entry, &entry_jshort_arraycopy, "jshort_arraycopy"); // Next arrays are always aligned on 4 bytes at least. StubRoutines::_jint_disjoint_arraycopy = generate_disjoint_copy(T_INT, true, Address::times_4, &entry, "jint_disjoint_arraycopy"); StubRoutines::_jint_arraycopy = generate_conjoint_copy(T_INT, true, Address::times_4, entry, &entry_jint_arraycopy, "jint_arraycopy"); StubRoutines::_oop_disjoint_arraycopy = generate_disjoint_copy(T_OBJECT, true, Address::times_ptr, &entry, "oop_disjoint_arraycopy"); StubRoutines::_oop_arraycopy = generate_conjoint_copy(T_OBJECT, true, Address::times_ptr, entry, &entry_oop_arraycopy, "oop_arraycopy"); StubRoutines::_oop_disjoint_arraycopy_no_pre = generate_disjoint_copy(T_OBJECT, true, Address::times_ptr, &entry, "oop_disjoint_arraycopy_no_pre", false); StubRoutines::_oop_arraycopy_no_pre = generate_conjoint_copy(T_OBJECT, true, Address::times_ptr, entry, NULL, "oop_arraycopy_no_pre", false); StubRoutines::_jlong_disjoint_arraycopy = generate_disjoint_long_copy(&entry, "jlong_disjoint_arraycopy"); StubRoutines::_jlong_arraycopy = generate_conjoint_long_copy(entry, &entry_jlong_arraycopy, "jlong_arraycopy"); StubRoutines::_jbyte_fill = generate_fill(T_BYTE, false, "jbyte_fill"); StubRoutines::_jshort_fill = generate_fill(T_SHORT, false, "jshort_fill"); StubRoutines::_jint_fill = generate_fill(T_INT, false, "jint_fill"); StubRoutines::_arrayof_jbyte_fill = generate_fill(T_BYTE, true, "arrayof_jbyte_fill"); StubRoutines::_arrayof_jshort_fill = generate_fill(T_SHORT, true, "arrayof_jshort_fill"); StubRoutines::_arrayof_jint_fill = generate_fill(T_INT, true, "arrayof_jint_fill"); StubRoutines::_arrayof_jint_disjoint_arraycopy = StubRoutines::_jint_disjoint_arraycopy; StubRoutines::_arrayof_oop_disjoint_arraycopy = StubRoutines::_oop_disjoint_arraycopy; StubRoutines::_arrayof_oop_disjoint_arraycopy_no_pre = StubRoutines::_oop_disjoint_arraycopy_no_pre; StubRoutines::_arrayof_jlong_disjoint_arraycopy = StubRoutines::_jlong_disjoint_arraycopy; StubRoutines::_arrayof_jint_arraycopy = StubRoutines::_jint_arraycopy; StubRoutines::_arrayof_oop_arraycopy = StubRoutines::_oop_arraycopy; StubRoutines::_arrayof_oop_arraycopy_no_pre = StubRoutines::_oop_arraycopy_no_pre; StubRoutines::_arrayof_jlong_arraycopy = StubRoutines::_jlong_arraycopy; StubRoutines::_checkcast_arraycopy = generate_checkcast_copy("checkcast_arraycopy", &entry_checkcast_arraycopy); StubRoutines::_checkcast_arraycopy_no_pre = generate_checkcast_copy("checkcast_arraycopy_no_pre", NULL, false); StubRoutines::_unsafe_arraycopy = generate_unsafe_copy("unsafe_arraycopy", entry_jbyte_arraycopy, entry_jshort_arraycopy, entry_jint_arraycopy, entry_jlong_arraycopy); StubRoutines::_generic_arraycopy = generate_generic_copy("generic_arraycopy", entry_jbyte_arraycopy, entry_jshort_arraycopy, entry_jint_arraycopy, entry_oop_arraycopy, entry_jlong_arraycopy, entry_checkcast_arraycopy); } void generate_math_stubs() { { StubCodeMark mark(this, "StubRoutines", "log"); StubRoutines::_intrinsic_log = (double (*)(double)) __ pc(); __ fld_d(Address(rsp, 4)); __ flog(); __ ret(0); } { StubCodeMark mark(this, "StubRoutines", "log10"); StubRoutines::_intrinsic_log10 = (double (*)(double)) __ pc(); __ fld_d(Address(rsp, 4)); __ flog10(); __ ret(0); } { StubCodeMark mark(this, "StubRoutines", "sin"); StubRoutines::_intrinsic_sin = (double (*)(double)) __ pc(); __ fld_d(Address(rsp, 4)); __ trigfunc('s'); __ ret(0); } { StubCodeMark mark(this, "StubRoutines", "cos"); StubRoutines::_intrinsic_cos = (double (*)(double)) __ pc(); __ fld_d(Address(rsp, 4)); __ trigfunc('c'); __ ret(0); } { StubCodeMark mark(this, "StubRoutines", "tan"); StubRoutines::_intrinsic_tan = (double (*)(double)) __ pc(); __ fld_d(Address(rsp, 4)); __ trigfunc('t'); __ ret(0); } // The intrinsic version of these seem to return the same value as // the strict version. StubRoutines::_intrinsic_exp = SharedRuntime::dexp; StubRoutines::_intrinsic_pow = SharedRuntime::dpow; } public: // Information about frame layout at time of blocking runtime call. // Note that we only have to preserve callee-saved registers since // the compilers are responsible for supplying a continuation point // if they expect all registers to be preserved. enum layout { thread_off, // last_java_sp rbp_off, // callee saved register ret_pc, framesize }; private: #undef __ #define __ masm-> //------------------------------------------------------------------------------------------------------------------------ // Continuation point for throwing of implicit exceptions that are not handled in // the current activation. Fabricates an exception oop and initiates normal // exception dispatching in this frame. // // Previously the compiler (c2) allowed for callee save registers on Java calls. // This is no longer true after adapter frames were removed but could possibly // be brought back in the future if the interpreter code was reworked and it // was deemed worthwhile. The comment below was left to describe what must // happen here if callee saves were resurrected. As it stands now this stub // could actually be a vanilla BufferBlob and have now oopMap at all. // Since it doesn't make much difference we've chosen to leave it the // way it was in the callee save days and keep the comment. // If we need to preserve callee-saved values we need a callee-saved oop map and // therefore have to make these stubs into RuntimeStubs rather than BufferBlobs. // If the compiler needs all registers to be preserved between the fault // point and the exception handler then it must assume responsibility for that in // AbstractCompiler::continuation_for_implicit_null_exception or // continuation_for_implicit_division_by_zero_exception. All other implicit // exceptions (e.g., NullPointerException or AbstractMethodError on entry) are // either at call sites or otherwise assume that stack unwinding will be initiated, // so caller saved registers were assumed volatile in the compiler. address generate_throw_exception(const char* name, address runtime_entry, bool restore_saved_exception_pc) { int insts_size = 256; int locs_size = 32; CodeBuffer code(name, insts_size, locs_size); OopMapSet* oop_maps = new OopMapSet(); MacroAssembler* masm = new MacroAssembler(&code); address start = __ pc(); // This is an inlined and slightly modified version of call_VM // which has the ability to fetch the return PC out of // thread-local storage and also sets up last_Java_sp slightly // differently than the real call_VM Register java_thread = rbx; __ get_thread(java_thread); if (restore_saved_exception_pc) { __ movptr(rax, Address(java_thread, in_bytes(JavaThread::saved_exception_pc_offset()))); __ push(rax); } __ enter(); // required for proper stackwalking of RuntimeStub frame // pc and rbp, already pushed __ subptr(rsp, (framesize-2) * wordSize); // prolog // Frame is now completed as far as size and linkage. int frame_complete = __ pc() - start; // push java thread (becomes first argument of C function) __ movptr(Address(rsp, thread_off * wordSize), java_thread); // Set up last_Java_sp and last_Java_fp __ set_last_Java_frame(java_thread, rsp, rbp, NULL); // Call runtime BLOCK_COMMENT("call runtime_entry"); __ call(RuntimeAddress(runtime_entry)); // Generate oop map OopMap* map = new OopMap(framesize, 0); oop_maps->add_gc_map(__ pc() - start, map); // restore the thread (cannot use the pushed argument since arguments // may be overwritten by C code generated by an optimizing compiler); // however can use the register value directly if it is callee saved. __ get_thread(java_thread); __ reset_last_Java_frame(java_thread, true, false); __ leave(); // required for proper stackwalking of RuntimeStub frame // check for pending exceptions #ifdef ASSERT Label L; __ cmpptr(Address(java_thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD); __ jcc(Assembler::notEqual, L); __ should_not_reach_here(); __ bind(L); #endif /* ASSERT */ __ jump(RuntimeAddress(StubRoutines::forward_exception_entry())); RuntimeStub* stub = RuntimeStub::new_runtime_stub(name, &code, frame_complete, framesize, oop_maps, false); return stub->entry_point(); } void create_control_words() { // Round to nearest, 53-bit mode, exceptions masked StubRoutines::_fpu_cntrl_wrd_std = 0x027F; // Round to zero, 53-bit mode, exception mased StubRoutines::_fpu_cntrl_wrd_trunc = 0x0D7F; // Round to nearest, 24-bit mode, exceptions masked StubRoutines::_fpu_cntrl_wrd_24 = 0x007F; // Round to nearest, 64-bit mode, exceptions masked StubRoutines::_fpu_cntrl_wrd_64 = 0x037F; // Round to nearest, 64-bit mode, exceptions masked StubRoutines::_mxcsr_std = 0x1F80; // Note: the following two constants are 80-bit values // layout is critical for correct loading by FPU. // Bias for strict fp multiply/divide StubRoutines::_fpu_subnormal_bias1[0]= 0x00000000; // 2^(-15360) == 0x03ff 8000 0000 0000 0000 StubRoutines::_fpu_subnormal_bias1[1]= 0x80000000; StubRoutines::_fpu_subnormal_bias1[2]= 0x03ff; // Un-Bias for strict fp multiply/divide StubRoutines::_fpu_subnormal_bias2[0]= 0x00000000; // 2^(+15360) == 0x7bff 8000 0000 0000 0000 StubRoutines::_fpu_subnormal_bias2[1]= 0x80000000; StubRoutines::_fpu_subnormal_bias2[2]= 0x7bff; } //--------------------------------------------------------------------------- // Initialization void generate_initial() { // Generates all stubs and initializes the entry points //------------------------------------------------------------------------------------------------------------------------ // entry points that exist in all platforms // Note: This is code that could be shared among different platforms - however the benefit seems to be smaller than // the disadvantage of having a much more complicated generator structure. See also comment in stubRoutines.hpp. StubRoutines::_forward_exception_entry = generate_forward_exception(); StubRoutines::_call_stub_entry = generate_call_stub(StubRoutines::_call_stub_return_address); // is referenced by megamorphic call StubRoutines::_catch_exception_entry = generate_catch_exception(); // These are currently used by Solaris/Intel StubRoutines::_atomic_xchg_entry = generate_atomic_xchg(); StubRoutines::_handler_for_unsafe_access_entry = generate_handler_for_unsafe_access(); // platform dependent create_control_words(); StubRoutines::x86::_verify_mxcsr_entry = generate_verify_mxcsr(); StubRoutines::x86::_verify_fpu_cntrl_wrd_entry = generate_verify_fpu_cntrl_wrd(); StubRoutines::_d2i_wrapper = generate_d2i_wrapper(T_INT, CAST_FROM_FN_PTR(address, SharedRuntime::d2i)); StubRoutines::_d2l_wrapper = generate_d2i_wrapper(T_LONG, CAST_FROM_FN_PTR(address, SharedRuntime::d2l)); } void generate_all() { // Generates all stubs and initializes the entry points // These entry points require SharedInfo::stack0 to be set up in non-core builds // and need to be relocatable, so they each fabricate a RuntimeStub internally. StubRoutines::_throw_AbstractMethodError_entry = generate_throw_exception("AbstractMethodError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError), false); StubRoutines::_throw_IncompatibleClassChangeError_entry= generate_throw_exception("IncompatibleClassChangeError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError), false); StubRoutines::_throw_ArithmeticException_entry = generate_throw_exception("ArithmeticException throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_ArithmeticException), true); StubRoutines::_throw_NullPointerException_entry = generate_throw_exception("NullPointerException throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException), true); StubRoutines::_throw_NullPointerException_at_call_entry= generate_throw_exception("NullPointerException at call throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call), false); StubRoutines::_throw_StackOverflowError_entry = generate_throw_exception("StackOverflowError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_StackOverflowError), false); //------------------------------------------------------------------------------------------------------------------------ // entry points that are platform specific // support for verify_oop (must happen after universe_init) StubRoutines::_verify_oop_subroutine_entry = generate_verify_oop(); // arraycopy stubs used by compilers generate_arraycopy_stubs(); generate_math_stubs(); } public: StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) { if (all) { generate_all(); } else { generate_initial(); } } }; // end class declaration void StubGenerator_generate(CodeBuffer* code, bool all) { StubGenerator g(code, all); }