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Diffstat (limited to 'deps/v8/src/ppc/deoptimizer-ppc.cc')
| -rw-r--r-- | deps/v8/src/ppc/deoptimizer-ppc.cc | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/deps/v8/src/ppc/deoptimizer-ppc.cc b/deps/v8/src/ppc/deoptimizer-ppc.cc new file mode 100644 index 0000000000..58e9e939f5 --- /dev/null +++ b/deps/v8/src/ppc/deoptimizer-ppc.cc @@ -0,0 +1,359 @@ +// Copyright 2014 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. + +#include "src/v8.h" + +#include "src/codegen.h" +#include "src/deoptimizer.h" +#include "src/full-codegen.h" +#include "src/safepoint-table.h" + +namespace v8 { +namespace internal { + +const int Deoptimizer::table_entry_size_ = 8; + + +int Deoptimizer::patch_size() { +#if V8_TARGET_ARCH_PPC64 + const int kCallInstructionSizeInWords = 7; +#else + const int kCallInstructionSizeInWords = 4; +#endif + return kCallInstructionSizeInWords * Assembler::kInstrSize; +} + + +void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) { + Address code_start_address = code->instruction_start(); + + // Invalidate the relocation information, as it will become invalid by the + // code patching below, and is not needed any more. + code->InvalidateRelocation(); + + if (FLAG_zap_code_space) { + // Fail hard and early if we enter this code object again. + byte* pointer = code->FindCodeAgeSequence(); + if (pointer != NULL) { + pointer += kNoCodeAgeSequenceLength; + } else { + pointer = code->instruction_start(); + } + CodePatcher patcher(pointer, 1); + patcher.masm()->bkpt(0); + + DeoptimizationInputData* data = + DeoptimizationInputData::cast(code->deoptimization_data()); + int osr_offset = data->OsrPcOffset()->value(); + if (osr_offset > 0) { + CodePatcher osr_patcher(code->instruction_start() + osr_offset, 1); + osr_patcher.masm()->bkpt(0); + } + } + + DeoptimizationInputData* deopt_data = + DeoptimizationInputData::cast(code->deoptimization_data()); +#ifdef DEBUG + Address prev_call_address = NULL; +#endif + // For each LLazyBailout instruction insert a call to the corresponding + // deoptimization entry. + for (int i = 0; i < deopt_data->DeoptCount(); i++) { + if (deopt_data->Pc(i)->value() == -1) continue; + Address call_address = code_start_address + deopt_data->Pc(i)->value(); + Address deopt_entry = GetDeoptimizationEntry(isolate, i, LAZY); + // We need calls to have a predictable size in the unoptimized code, but + // this is optimized code, so we don't have to have a predictable size. + int call_size_in_bytes = MacroAssembler::CallSizeNotPredictableCodeSize( + deopt_entry, kRelocInfo_NONEPTR); + int call_size_in_words = call_size_in_bytes / Assembler::kInstrSize; + DCHECK(call_size_in_bytes % Assembler::kInstrSize == 0); + DCHECK(call_size_in_bytes <= patch_size()); + CodePatcher patcher(call_address, call_size_in_words); + patcher.masm()->Call(deopt_entry, kRelocInfo_NONEPTR); + DCHECK(prev_call_address == NULL || + call_address >= prev_call_address + patch_size()); + DCHECK(call_address + patch_size() <= code->instruction_end()); +#ifdef DEBUG + prev_call_address = call_address; +#endif + } +} + + +void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) { + // Set the register values. The values are not important as there are no + // callee saved registers in JavaScript frames, so all registers are + // spilled. Registers fp and sp are set to the correct values though. + + for (int i = 0; i < Register::kNumRegisters; i++) { + input_->SetRegister(i, i * 4); + } + input_->SetRegister(sp.code(), reinterpret_cast<intptr_t>(frame->sp())); + input_->SetRegister(fp.code(), reinterpret_cast<intptr_t>(frame->fp())); + for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); i++) { + input_->SetDoubleRegister(i, 0.0); + } + + // Fill the frame content from the actual data on the frame. + for (unsigned i = 0; i < input_->GetFrameSize(); i += kPointerSize) { + input_->SetFrameSlot( + i, reinterpret_cast<intptr_t>(Memory::Address_at(tos + i))); + } +} + + +void Deoptimizer::SetPlatformCompiledStubRegisters( + FrameDescription* output_frame, CodeStubDescriptor* descriptor) { + ApiFunction function(descriptor->deoptimization_handler()); + ExternalReference xref(&function, ExternalReference::BUILTIN_CALL, isolate_); + intptr_t handler = reinterpret_cast<intptr_t>(xref.address()); + int params = descriptor->GetHandlerParameterCount(); + output_frame->SetRegister(r3.code(), params); + output_frame->SetRegister(r4.code(), handler); +} + + +void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) { + for (int i = 0; i < DoubleRegister::kMaxNumRegisters; ++i) { + double double_value = input_->GetDoubleRegister(i); + output_frame->SetDoubleRegister(i, double_value); + } +} + + +bool Deoptimizer::HasAlignmentPadding(JSFunction* function) { + // There is no dynamic alignment padding on PPC in the input frame. + return false; +} + + +#define __ masm()-> + +// This code tries to be close to ia32 code so that any changes can be +// easily ported. +void Deoptimizer::EntryGenerator::Generate() { + GeneratePrologue(); + + // Unlike on ARM we don't save all the registers, just the useful ones. + // For the rest, there are gaps on the stack, so the offsets remain the same. + const int kNumberOfRegisters = Register::kNumRegisters; + + RegList restored_regs = kJSCallerSaved | kCalleeSaved; + RegList saved_regs = restored_regs | sp.bit(); + + const int kDoubleRegsSize = + kDoubleSize * DoubleRegister::kMaxNumAllocatableRegisters; + + // Save all FPU registers before messing with them. + __ subi(sp, sp, Operand(kDoubleRegsSize)); + for (int i = 0; i < DoubleRegister::kMaxNumAllocatableRegisters; ++i) { + DoubleRegister fpu_reg = DoubleRegister::FromAllocationIndex(i); + int offset = i * kDoubleSize; + __ stfd(fpu_reg, MemOperand(sp, offset)); + } + + // Push saved_regs (needed to populate FrameDescription::registers_). + // Leave gaps for other registers. + __ subi(sp, sp, Operand(kNumberOfRegisters * kPointerSize)); + for (int16_t i = kNumberOfRegisters - 1; i >= 0; i--) { + if ((saved_regs & (1 << i)) != 0) { + __ StoreP(ToRegister(i), MemOperand(sp, kPointerSize * i)); + } + } + + const int kSavedRegistersAreaSize = + (kNumberOfRegisters * kPointerSize) + kDoubleRegsSize; + + // Get the bailout id from the stack. + __ LoadP(r5, MemOperand(sp, kSavedRegistersAreaSize)); + + // Get the address of the location in the code object (r6) (return + // address for lazy deoptimization) and compute the fp-to-sp delta in + // register r7. + __ mflr(r6); + // Correct one word for bailout id. + __ addi(r7, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize))); + __ sub(r7, fp, r7); + + // Allocate a new deoptimizer object. + // Pass six arguments in r3 to r8. + __ PrepareCallCFunction(6, r8); + __ LoadP(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset)); + __ li(r4, Operand(type())); // bailout type, + // r5: bailout id already loaded. + // r6: code address or 0 already loaded. + // r7: Fp-to-sp delta. + __ mov(r8, Operand(ExternalReference::isolate_address(isolate()))); + // Call Deoptimizer::New(). + { + AllowExternalCallThatCantCauseGC scope(masm()); + __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6); + } + + // Preserve "deoptimizer" object in register r3 and get the input + // frame descriptor pointer to r4 (deoptimizer->input_); + __ LoadP(r4, MemOperand(r3, Deoptimizer::input_offset())); + + // Copy core registers into FrameDescription::registers_[kNumRegisters]. + DCHECK(Register::kNumRegisters == kNumberOfRegisters); + for (int i = 0; i < kNumberOfRegisters; i++) { + int offset = (i * kPointerSize) + FrameDescription::registers_offset(); + __ LoadP(r5, MemOperand(sp, i * kPointerSize)); + __ StoreP(r5, MemOperand(r4, offset)); + } + + int double_regs_offset = FrameDescription::double_registers_offset(); + // Copy VFP registers to + // double_registers_[DoubleRegister::kNumAllocatableRegisters] + for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); ++i) { + int dst_offset = i * kDoubleSize + double_regs_offset; + int src_offset = i * kDoubleSize + kNumberOfRegisters * kPointerSize; + __ lfd(d0, MemOperand(sp, src_offset)); + __ stfd(d0, MemOperand(r4, dst_offset)); + } + + // Remove the bailout id and the saved registers from the stack. + __ addi(sp, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize))); + + // Compute a pointer to the unwinding limit in register r5; that is + // the first stack slot not part of the input frame. + __ LoadP(r5, MemOperand(r4, FrameDescription::frame_size_offset())); + __ add(r5, r5, sp); + + // Unwind the stack down to - but not including - the unwinding + // limit and copy the contents of the activation frame to the input + // frame description. + __ addi(r6, r4, Operand(FrameDescription::frame_content_offset())); + Label pop_loop; + Label pop_loop_header; + __ b(&pop_loop_header); + __ bind(&pop_loop); + __ pop(r7); + __ StoreP(r7, MemOperand(r6, 0)); + __ addi(r6, r6, Operand(kPointerSize)); + __ bind(&pop_loop_header); + __ cmp(r5, sp); + __ bne(&pop_loop); + + // Compute the output frame in the deoptimizer. + __ push(r3); // Preserve deoptimizer object across call. + // r3: deoptimizer object; r4: scratch. + __ PrepareCallCFunction(1, r4); + // Call Deoptimizer::ComputeOutputFrames(). + { + AllowExternalCallThatCantCauseGC scope(masm()); + __ CallCFunction( + ExternalReference::compute_output_frames_function(isolate()), 1); + } + __ pop(r3); // Restore deoptimizer object (class Deoptimizer). + + // 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: r7 = current "FrameDescription** output_", + // r4 = one past the last FrameDescription**. + __ lwz(r4, MemOperand(r3, Deoptimizer::output_count_offset())); + __ LoadP(r7, MemOperand(r3, Deoptimizer::output_offset())); // r7 is output_. + __ ShiftLeftImm(r4, r4, Operand(kPointerSizeLog2)); + __ add(r4, r7, r4); + __ b(&outer_loop_header); + + __ bind(&outer_push_loop); + // Inner loop state: r5 = current FrameDescription*, r6 = loop index. + __ LoadP(r5, MemOperand(r7, 0)); // output_[ix] + __ LoadP(r6, MemOperand(r5, FrameDescription::frame_size_offset())); + __ b(&inner_loop_header); + + __ bind(&inner_push_loop); + __ addi(r6, r6, Operand(-sizeof(intptr_t))); + __ add(r9, r5, r6); + __ LoadP(r9, MemOperand(r9, FrameDescription::frame_content_offset())); + __ push(r9); + + __ bind(&inner_loop_header); + __ cmpi(r6, Operand::Zero()); + __ bne(&inner_push_loop); // test for gt? + + __ addi(r7, r7, Operand(kPointerSize)); + __ bind(&outer_loop_header); + __ cmp(r7, r4); + __ blt(&outer_push_loop); + + __ LoadP(r4, MemOperand(r3, Deoptimizer::input_offset())); + for (int i = 0; i < DoubleRegister::kMaxNumAllocatableRegisters; ++i) { + const DoubleRegister dreg = DoubleRegister::FromAllocationIndex(i); + int src_offset = i * kDoubleSize + double_regs_offset; + __ lfd(dreg, MemOperand(r4, src_offset)); + } + + // Push state, pc, and continuation from the last output frame. + __ LoadP(r9, MemOperand(r5, FrameDescription::state_offset())); + __ push(r9); + __ LoadP(r9, MemOperand(r5, FrameDescription::pc_offset())); + __ push(r9); + __ LoadP(r9, MemOperand(r5, FrameDescription::continuation_offset())); + __ push(r9); + + // Restore the registers from the last output frame. + DCHECK(!(ip.bit() & restored_regs)); + __ mr(ip, r5); + for (int i = kNumberOfRegisters - 1; i >= 0; i--) { + int offset = (i * kPointerSize) + FrameDescription::registers_offset(); + if ((restored_regs & (1 << i)) != 0) { + __ LoadP(ToRegister(i), MemOperand(ip, offset)); + } + } + + __ InitializeRootRegister(); + + __ pop(ip); // get continuation, leave pc on stack + __ pop(r0); + __ mtlr(r0); + __ Jump(ip); + __ stop("Unreachable."); +} + + +void Deoptimizer::TableEntryGenerator::GeneratePrologue() { + Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm()); + + // Create a sequence of deoptimization entries. + // Note that registers are still live when jumping to an entry. + Label done; + for (int i = 0; i < count(); i++) { + int start = masm()->pc_offset(); + USE(start); + __ li(ip, Operand(i)); + __ b(&done); + DCHECK(masm()->pc_offset() - start == table_entry_size_); + } + __ bind(&done); + __ push(ip); +} + + +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) { +#if V8_OOL_CONSTANT_POOL + DCHECK(FLAG_enable_ool_constant_pool); + SetFrameSlot(offset, value); +#else + // No out-of-line constant pool support. + UNREACHABLE(); +#endif +} + + +#undef __ +} +} // namespace v8::internal |