// Copyright 2012 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #if V8_TARGET_ARCH_IA32 #include "src/assembler-inl.h" #include "src/codegen.h" #include "src/deoptimizer.h" #include "src/frame-constants.h" #include "src/register-configuration.h" #include "src/safepoint-table.h" namespace v8 { namespace internal { const int Deoptimizer::table_entry_size_ = 10; #define __ masm()-> void Deoptimizer::TableEntryGenerator::Generate() { GeneratePrologue(); // Save all general purpose registers before messing with them. const int kNumberOfRegisters = Register::kNumRegisters; const int kDoubleRegsSize = kDoubleSize * XMMRegister::kNumRegisters; __ sub(esp, Immediate(kDoubleRegsSize)); const RegisterConfiguration* config = RegisterConfiguration::Default(); for (int i = 0; i < config->num_allocatable_double_registers(); ++i) { int code = config->GetAllocatableDoubleCode(i); XMMRegister xmm_reg = XMMRegister::from_code(code); int offset = code * kDoubleSize; __ movsd(Operand(esp, offset), xmm_reg); } STATIC_ASSERT(kFloatSize == kPointerSize); const int kFloatRegsSize = kFloatSize * XMMRegister::kNumRegisters; __ sub(esp, Immediate(kFloatRegsSize)); for (int i = 0; i < config->num_allocatable_float_registers(); ++i) { int code = config->GetAllocatableFloatCode(i); XMMRegister xmm_reg = XMMRegister::from_code(code); int offset = code * kFloatSize; __ movss(Operand(esp, offset), xmm_reg); } __ pushad(); ExternalReference c_entry_fp_address(IsolateAddressId::kCEntryFPAddress, isolate()); __ mov(Operand::StaticVariable(c_entry_fp_address), ebp); const int kSavedRegistersAreaSize = kNumberOfRegisters * kPointerSize + kDoubleRegsSize + kFloatRegsSize; // Get the bailout id from the stack. __ mov(ebx, Operand(esp, kSavedRegistersAreaSize)); // Get the address of the location in the code object // and compute the fp-to-sp delta in register edx. __ mov(ecx, Operand(esp, kSavedRegistersAreaSize + 1 * kPointerSize)); __ lea(edx, Operand(esp, kSavedRegistersAreaSize + 2 * kPointerSize)); __ sub(edx, ebp); __ neg(edx); // Allocate a new deoptimizer object. __ PrepareCallCFunction(6, eax); __ mov(eax, Immediate(0)); Label context_check; __ mov(edi, Operand(ebp, CommonFrameConstants::kContextOrFrameTypeOffset)); __ JumpIfSmi(edi, &context_check); __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset)); __ bind(&context_check); __ mov(Operand(esp, 0 * kPointerSize), eax); // Function. __ mov(Operand(esp, 1 * kPointerSize), Immediate(type())); // Bailout type. __ mov(Operand(esp, 2 * kPointerSize), ebx); // Bailout id. __ mov(Operand(esp, 3 * kPointerSize), ecx); // Code address or 0. __ mov(Operand(esp, 4 * kPointerSize), edx); // Fp-to-sp delta. __ mov(Operand(esp, 5 * kPointerSize), Immediate(ExternalReference::isolate_address(isolate()))); { AllowExternalCallThatCantCauseGC scope(masm()); __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6); } // Preserve deoptimizer object in register eax and get the input // frame descriptor pointer. __ mov(ebx, Operand(eax, Deoptimizer::input_offset())); // Fill in the input registers. for (int i = kNumberOfRegisters - 1; i >= 0; i--) { int offset = (i * kPointerSize) + FrameDescription::registers_offset(); __ pop(Operand(ebx, offset)); } int float_regs_offset = FrameDescription::float_registers_offset(); // Fill in the float input registers. for (int i = 0; i < XMMRegister::kNumRegisters; i++) { int dst_offset = i * kFloatSize + float_regs_offset; __ pop(Operand(ebx, dst_offset)); } int double_regs_offset = FrameDescription::double_registers_offset(); // Fill in the double input registers. for (int i = 0; i < config->num_allocatable_double_registers(); ++i) { int code = config->GetAllocatableDoubleCode(i); int dst_offset = code * kDoubleSize + double_regs_offset; int src_offset = code * kDoubleSize; __ movsd(xmm0, Operand(esp, src_offset)); __ movsd(Operand(ebx, dst_offset), xmm0); } // Clear FPU all exceptions. // TODO(ulan): Find out why the TOP register is not zero here in some cases, // and check that the generated code never deoptimizes with unbalanced stack. __ fnclex(); // Remove the bailout id, return address and the double registers. __ add(esp, Immediate(kDoubleRegsSize + 2 * kPointerSize)); // Compute a pointer to the unwinding limit in register ecx; that is // the first stack slot not part of the input frame. __ mov(ecx, Operand(ebx, FrameDescription::frame_size_offset())); __ add(ecx, esp); // Unwind the stack down to - but not including - the unwinding // limit and copy the contents of the activation frame to the input // frame description. __ lea(edx, Operand(ebx, FrameDescription::frame_content_offset())); Label pop_loop_header; __ jmp(&pop_loop_header); Label pop_loop; __ bind(&pop_loop); __ pop(Operand(edx, 0)); __ add(edx, Immediate(sizeof(uint32_t))); __ bind(&pop_loop_header); __ cmp(ecx, esp); __ j(not_equal, &pop_loop); // Compute the output frame in the deoptimizer. __ push(eax); __ PrepareCallCFunction(1, ebx); __ mov(Operand(esp, 0 * kPointerSize), eax); { AllowExternalCallThatCantCauseGC scope(masm()); __ CallCFunction( ExternalReference::compute_output_frames_function(isolate()), 1); } __ pop(eax); __ mov(esp, Operand(eax, Deoptimizer::caller_frame_top_offset())); // Replace the current (input) frame with the output frames. Label outer_push_loop, inner_push_loop, outer_loop_header, inner_loop_header; // Outer loop state: eax = current FrameDescription**, edx = one past the // last FrameDescription**. __ mov(edx, Operand(eax, Deoptimizer::output_count_offset())); __ mov(eax, Operand(eax, Deoptimizer::output_offset())); __ lea(edx, Operand(eax, edx, times_4, 0)); __ jmp(&outer_loop_header); __ bind(&outer_push_loop); // Inner loop state: ebx = current FrameDescription*, ecx = loop index. __ mov(ebx, Operand(eax, 0)); __ mov(ecx, Operand(ebx, FrameDescription::frame_size_offset())); __ jmp(&inner_loop_header); __ bind(&inner_push_loop); __ sub(ecx, Immediate(sizeof(uint32_t))); __ push(Operand(ebx, ecx, times_1, FrameDescription::frame_content_offset())); __ bind(&inner_loop_header); __ test(ecx, ecx); __ j(not_zero, &inner_push_loop); __ add(eax, Immediate(kPointerSize)); __ bind(&outer_loop_header); __ cmp(eax, edx); __ j(below, &outer_push_loop); // In case of a failed STUB, we have to restore the XMM registers. for (int i = 0; i < config->num_allocatable_double_registers(); ++i) { int code = config->GetAllocatableDoubleCode(i); XMMRegister xmm_reg = XMMRegister::from_code(code); int src_offset = code * kDoubleSize + double_regs_offset; __ movsd(xmm_reg, Operand(ebx, src_offset)); } // Push pc and continuation from the last output frame. __ push(Operand(ebx, FrameDescription::pc_offset())); __ push(Operand(ebx, FrameDescription::continuation_offset())); // Push the registers from the last output frame. for (int i = 0; i < kNumberOfRegisters; i++) { int offset = (i * kPointerSize) + FrameDescription::registers_offset(); __ push(Operand(ebx, offset)); } // Restore the registers from the stack. __ popad(); // Return to the continuation point. __ ret(0); } void Deoptimizer::TableEntryGenerator::GeneratePrologue() { // Create a sequence of deoptimization entries. Label done; for (int i = 0; i < count(); i++) { int start = masm()->pc_offset(); USE(start); __ push_imm32(i); __ jmp(&done); DCHECK(masm()->pc_offset() - start == table_entry_size_); } __ bind(&done); } bool Deoptimizer::PadTopOfStackRegister() { return false; } void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) { SetFrameSlot(offset, value); } void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) { SetFrameSlot(offset, value); } void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) { // No embedded constant pool support. UNREACHABLE(); } #undef __ } // namespace internal } // namespace v8 #endif // V8_TARGET_ARCH_IA32