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// 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.
#ifndef V8_COMPILER_CODE_GENERATOR_H_
#define V8_COMPILER_CODE_GENERATOR_H_
#include "src/compiler/gap-resolver.h"
#include "src/compiler/instruction.h"
#include "src/deoptimizer.h"
#include "src/macro-assembler.h"
#include "src/safepoint-table.h"
namespace v8 {
namespace internal {
namespace compiler {
// Forward declarations.
class Linkage;
class OutOfLineCode;
struct BranchInfo {
FlagsCondition condition;
Label* true_label;
Label* false_label;
bool fallthru;
};
// Generates native code for a sequence of instructions.
class CodeGenerator FINAL : public GapResolver::Assembler {
public:
explicit CodeGenerator(Frame* frame, Linkage* linkage,
InstructionSequence* code, CompilationInfo* info);
// Generate native code.
Handle<Code> GenerateCode();
InstructionSequence* code() const { return code_; }
Frame* frame() const { return frame_; }
Isolate* isolate() const { return info_->isolate(); }
Linkage* linkage() const { return linkage_; }
Label* GetLabel(RpoNumber rpo) { return &labels_[rpo.ToSize()]; }
private:
MacroAssembler* masm() { return &masm_; }
GapResolver* resolver() { return &resolver_; }
SafepointTableBuilder* safepoints() { return &safepoints_; }
Zone* zone() const { return code()->zone(); }
CompilationInfo* info() const { return info_; }
// Checks if {block} will appear directly after {current_block_} when
// assembling code, in which case, a fall-through can be used.
bool IsNextInAssemblyOrder(RpoNumber block) const;
// Record a safepoint with the given pointer map.
void RecordSafepoint(PointerMap* pointers, Safepoint::Kind kind,
int arguments, Safepoint::DeoptMode deopt_mode);
// Assemble code for the specified instruction.
void AssembleInstruction(Instruction* instr);
void AssembleSourcePosition(SourcePositionInstruction* instr);
void AssembleGap(GapInstruction* gap);
// ===========================================================================
// ============= Architecture-specific code generation methods. ==============
// ===========================================================================
void AssembleArchInstruction(Instruction* instr);
void AssembleArchJump(RpoNumber target);
void AssembleArchBranch(Instruction* instr, BranchInfo* branch);
void AssembleArchBoolean(Instruction* instr, FlagsCondition condition);
void AssembleArchLookupSwitch(Instruction* instr);
void AssembleArchTableSwitch(Instruction* instr);
void AssembleDeoptimizerCall(int deoptimization_id,
Deoptimizer::BailoutType bailout_type);
// Generates an architecture-specific, descriptor-specific prologue
// to set up a stack frame.
void AssemblePrologue();
// Generates an architecture-specific, descriptor-specific return sequence
// to tear down a stack frame.
void AssembleReturn();
// ===========================================================================
// ============== Architecture-specific gap resolver methods. ================
// ===========================================================================
// Interface used by the gap resolver to emit moves and swaps.
void AssembleMove(InstructionOperand* source,
InstructionOperand* destination) FINAL;
void AssembleSwap(InstructionOperand* source,
InstructionOperand* destination) FINAL;
// ===========================================================================
// =================== Jump table construction methods. ======================
// ===========================================================================
class JumpTable;
// Adds a jump table that is emitted after the actual code. Returns label
// pointing to the beginning of the table. {targets} is assumed to be static
// or zone allocated.
Label* AddJumpTable(Label** targets, size_t target_count);
// Emits a jump table.
void AssembleJumpTable(Label** targets, size_t target_count);
// ===========================================================================
// ================== Deoptimization table construction. =====================
// ===========================================================================
void RecordCallPosition(Instruction* instr);
void PopulateDeoptimizationData(Handle<Code> code);
int DefineDeoptimizationLiteral(Handle<Object> literal);
FrameStateDescriptor* GetFrameStateDescriptor(Instruction* instr,
size_t frame_state_offset);
int BuildTranslation(Instruction* instr, int pc_offset,
size_t frame_state_offset,
OutputFrameStateCombine state_combine);
void BuildTranslationForFrameStateDescriptor(
FrameStateDescriptor* descriptor, Instruction* instr,
Translation* translation, size_t frame_state_offset,
OutputFrameStateCombine state_combine);
void AddTranslationForOperand(Translation* translation, Instruction* instr,
InstructionOperand* op, MachineType type);
void AddNopForSmiCodeInlining();
void EnsureSpaceForLazyDeopt();
void MarkLazyDeoptSite();
// ===========================================================================
struct DeoptimizationState : ZoneObject {
public:
BailoutId bailout_id() const { return bailout_id_; }
int translation_id() const { return translation_id_; }
int pc_offset() const { return pc_offset_; }
DeoptimizationState(BailoutId bailout_id, int translation_id, int pc_offset)
: bailout_id_(bailout_id),
translation_id_(translation_id),
pc_offset_(pc_offset) {}
private:
BailoutId bailout_id_;
int translation_id_;
int pc_offset_;
};
struct HandlerInfo {
Label* handler;
int pc_offset;
};
friend class OutOfLineCode;
Frame* const frame_;
Linkage* const linkage_;
InstructionSequence* const code_;
CompilationInfo* const info_;
Label* const labels_;
RpoNumber current_block_;
SourcePosition current_source_position_;
MacroAssembler masm_;
GapResolver resolver_;
SafepointTableBuilder safepoints_;
ZoneVector<HandlerInfo> handlers_;
ZoneDeque<DeoptimizationState*> deoptimization_states_;
ZoneDeque<Handle<Object>> deoptimization_literals_;
TranslationBuffer translations_;
int last_lazy_deopt_pc_;
JumpTable* jump_tables_;
OutOfLineCode* ools_;
int osr_pc_offset_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_CODE_GENERATOR_H
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