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Diffstat (limited to 'deps/v8/src/deoptimizer/mips64/deoptimizer-mips64.cc')
| -rw-r--r-- | deps/v8/src/deoptimizer/mips64/deoptimizer-mips64.cc | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/deps/v8/src/deoptimizer/mips64/deoptimizer-mips64.cc b/deps/v8/src/deoptimizer/mips64/deoptimizer-mips64.cc new file mode 100644 index 0000000000..6869199f1b --- /dev/null +++ b/deps/v8/src/deoptimizer/mips64/deoptimizer-mips64.cc @@ -0,0 +1,257 @@ +// Copyright 2011 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/codegen/macro-assembler.h" +#include "src/codegen/register-configuration.h" +#include "src/codegen/safepoint-table.h" +#include "src/deoptimizer/deoptimizer.h" + +namespace v8 { +namespace internal { + +#define __ masm-> + +// This code tries to be close to ia32 code so that any changes can be +// easily ported. +void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm, + Isolate* isolate, + DeoptimizeKind deopt_kind) { + NoRootArrayScope no_root_array(masm); + + // 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() | ra.bit(); + + const int kDoubleRegsSize = kDoubleSize * DoubleRegister::kNumRegisters; + const int kFloatRegsSize = kFloatSize * FloatRegister::kNumRegisters; + + // Save all double FPU registers before messing with them. + __ Dsubu(sp, sp, Operand(kDoubleRegsSize)); + const RegisterConfiguration* config = RegisterConfiguration::Default(); + for (int i = 0; i < config->num_allocatable_double_registers(); ++i) { + int code = config->GetAllocatableDoubleCode(i); + const DoubleRegister fpu_reg = DoubleRegister::from_code(code); + int offset = code * kDoubleSize; + __ Sdc1(fpu_reg, MemOperand(sp, offset)); + } + + // Save all float FPU registers before messing with them. + __ Dsubu(sp, sp, Operand(kFloatRegsSize)); + for (int i = 0; i < config->num_allocatable_float_registers(); ++i) { + int code = config->GetAllocatableFloatCode(i); + const FloatRegister fpu_reg = FloatRegister::from_code(code); + int offset = code * kFloatSize; + __ Swc1(fpu_reg, MemOperand(sp, offset)); + } + + // Push saved_regs (needed to populate FrameDescription::registers_). + // Leave gaps for other registers. + __ Dsubu(sp, sp, kNumberOfRegisters * kPointerSize); + for (int16_t i = kNumberOfRegisters - 1; i >= 0; i--) { + if ((saved_regs & (1 << i)) != 0) { + __ Sd(ToRegister(i), MemOperand(sp, kPointerSize * i)); + } + } + + __ li(a2, Operand(ExternalReference::Create( + IsolateAddressId::kCEntryFPAddress, isolate))); + __ Sd(fp, MemOperand(a2)); + + const int kSavedRegistersAreaSize = + (kNumberOfRegisters * kPointerSize) + kDoubleRegsSize + kFloatRegsSize; + + // Get the bailout is passed as kRootRegister by the caller. + __ mov(a2, kRootRegister); + + // Get the address of the location in the code object (a3) (return + // address for lazy deoptimization) and compute the fp-to-sp delta in + // register a4. + __ mov(a3, ra); + __ Daddu(a4, sp, Operand(kSavedRegistersAreaSize)); + + __ Dsubu(a4, fp, a4); + + // Allocate a new deoptimizer object. + __ PrepareCallCFunction(6, a5); + // Pass six arguments, according to n64 ABI. + __ mov(a0, zero_reg); + Label context_check; + __ Ld(a1, MemOperand(fp, CommonFrameConstants::kContextOrFrameTypeOffset)); + __ JumpIfSmi(a1, &context_check); + __ Ld(a0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset)); + __ bind(&context_check); + __ li(a1, Operand(static_cast<int>(deopt_kind))); + // a2: bailout id already loaded. + // a3: code address or 0 already loaded. + // a4: already has fp-to-sp delta. + __ li(a5, Operand(ExternalReference::isolate_address(isolate))); + + // Call Deoptimizer::New(). + { + AllowExternalCallThatCantCauseGC scope(masm); + __ CallCFunction(ExternalReference::new_deoptimizer_function(), 6); + } + + // Preserve "deoptimizer" object in register v0 and get the input + // frame descriptor pointer to a1 (deoptimizer->input_); + // Move deopt-obj to a0 for call to Deoptimizer::ComputeOutputFrames() below. + __ mov(a0, v0); + __ Ld(a1, MemOperand(v0, Deoptimizer::input_offset())); + + // Copy core registers into FrameDescription::registers_[kNumRegisters]. + DCHECK_EQ(Register::kNumRegisters, kNumberOfRegisters); + for (int i = 0; i < kNumberOfRegisters; i++) { + int offset = (i * kPointerSize) + FrameDescription::registers_offset(); + if ((saved_regs & (1 << i)) != 0) { + __ Ld(a2, MemOperand(sp, i * kPointerSize)); + __ Sd(a2, MemOperand(a1, offset)); + } else if (FLAG_debug_code) { + __ li(a2, kDebugZapValue); + __ Sd(a2, MemOperand(a1, offset)); + } + } + + int double_regs_offset = FrameDescription::double_registers_offset(); + // Copy FPU registers to + // double_registers_[DoubleRegister::kNumAllocatableRegisters] + 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 + kNumberOfRegisters * kPointerSize + kFloatRegsSize; + __ Ldc1(f0, MemOperand(sp, src_offset)); + __ Sdc1(f0, MemOperand(a1, dst_offset)); + } + + int float_regs_offset = FrameDescription::float_registers_offset(); + // Copy FPU registers to + // float_registers_[FloatRegister::kNumAllocatableRegisters] + for (int i = 0; i < config->num_allocatable_float_registers(); ++i) { + int code = config->GetAllocatableFloatCode(i); + int dst_offset = code * kFloatSize + float_regs_offset; + int src_offset = code * kFloatSize + kNumberOfRegisters * kPointerSize; + __ Lwc1(f0, MemOperand(sp, src_offset)); + __ Swc1(f0, MemOperand(a1, dst_offset)); + } + + // Remove the saved registers from the stack. + __ Daddu(sp, sp, Operand(kSavedRegistersAreaSize)); + + // Compute a pointer to the unwinding limit in register a2; that is + // the first stack slot not part of the input frame. + __ Ld(a2, MemOperand(a1, FrameDescription::frame_size_offset())); + __ Daddu(a2, a2, 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. + __ Daddu(a3, a1, Operand(FrameDescription::frame_content_offset())); + Label pop_loop; + Label pop_loop_header; + __ BranchShort(&pop_loop_header); + __ bind(&pop_loop); + __ pop(a4); + __ Sd(a4, MemOperand(a3, 0)); + __ daddiu(a3, a3, sizeof(uint64_t)); + __ bind(&pop_loop_header); + __ BranchShort(&pop_loop, ne, a2, Operand(sp)); + // Compute the output frame in the deoptimizer. + __ push(a0); // Preserve deoptimizer object across call. + // a0: deoptimizer object; a1: scratch. + __ PrepareCallCFunction(1, a1); + // Call Deoptimizer::ComputeOutputFrames(). + { + AllowExternalCallThatCantCauseGC scope(masm); + __ CallCFunction(ExternalReference::compute_output_frames_function(), 1); + } + __ pop(a0); // Restore deoptimizer object (class Deoptimizer). + + __ Ld(sp, MemOperand(a0, 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: a4 = current "FrameDescription** output_", + // a1 = one past the last FrameDescription**. + __ Lw(a1, MemOperand(a0, Deoptimizer::output_count_offset())); + __ Ld(a4, MemOperand(a0, Deoptimizer::output_offset())); // a4 is output_. + __ Dlsa(a1, a4, a1, kPointerSizeLog2); + __ BranchShort(&outer_loop_header); + __ bind(&outer_push_loop); + // Inner loop state: a2 = current FrameDescription*, a3 = loop index. + __ Ld(a2, MemOperand(a4, 0)); // output_[ix] + __ Ld(a3, MemOperand(a2, FrameDescription::frame_size_offset())); + __ BranchShort(&inner_loop_header); + __ bind(&inner_push_loop); + __ Dsubu(a3, a3, Operand(sizeof(uint64_t))); + __ Daddu(a6, a2, Operand(a3)); + __ Ld(a7, MemOperand(a6, FrameDescription::frame_content_offset())); + __ push(a7); + __ bind(&inner_loop_header); + __ BranchShort(&inner_push_loop, ne, a3, Operand(zero_reg)); + + __ Daddu(a4, a4, Operand(kPointerSize)); + __ bind(&outer_loop_header); + __ BranchShort(&outer_push_loop, lt, a4, Operand(a1)); + + __ Ld(a1, MemOperand(a0, Deoptimizer::input_offset())); + for (int i = 0; i < config->num_allocatable_double_registers(); ++i) { + int code = config->GetAllocatableDoubleCode(i); + const DoubleRegister fpu_reg = DoubleRegister::from_code(code); + int src_offset = code * kDoubleSize + double_regs_offset; + __ Ldc1(fpu_reg, MemOperand(a1, src_offset)); + } + + // Push pc and continuation from the last output frame. + __ Ld(a6, MemOperand(a2, FrameDescription::pc_offset())); + __ push(a6); + __ Ld(a6, MemOperand(a2, FrameDescription::continuation_offset())); + __ push(a6); + + // Technically restoring 'at' should work unless zero_reg is also restored + // but it's safer to check for this. + DCHECK(!(at.bit() & restored_regs)); + // Restore the registers from the last output frame. + __ mov(at, a2); + for (int i = kNumberOfRegisters - 1; i >= 0; i--) { + int offset = (i * kPointerSize) + FrameDescription::registers_offset(); + if ((restored_regs & (1 << i)) != 0) { + __ Ld(ToRegister(i), MemOperand(at, offset)); + } + } + + __ pop(at); // Get continuation, leave pc on stack. + __ pop(ra); + __ Jump(at); + __ stop("Unreachable."); +} + +// Maximum size of a table entry generated below. +#ifdef _MIPS_ARCH_MIPS64R6 +const int Deoptimizer::table_entry_size_ = 2 * kInstrSize; +#else +const int Deoptimizer::table_entry_size_ = 3 * kInstrSize; +#endif + +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 |