1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef V8_COMPILER_CODE_GENERATOR_H_
6 #define V8_COMPILER_CODE_GENERATOR_H_
10 #include "src/compiler/gap-resolver.h"
11 #include "src/compiler/instruction.h"
12 #include "src/deoptimizer.h"
13 #include "src/macro-assembler.h"
14 #include "src/safepoint-table.h"
20 // Generates native code for a sequence of instructions.
21 class CodeGenerator FINAL : public GapResolver::Assembler {
23 explicit CodeGenerator(InstructionSequence* code);
25 // Generate native code.
26 Handle<Code> GenerateCode();
28 InstructionSequence* code() const { return code_; }
29 Frame* frame() const { return code()->frame(); }
30 Graph* graph() const { return code()->graph(); }
31 Isolate* isolate() const { return zone()->isolate(); }
32 Linkage* linkage() const { return code()->linkage(); }
33 Schedule* schedule() const { return code()->schedule(); }
36 MacroAssembler* masm() { return &masm_; }
37 GapResolver* resolver() { return &resolver_; }
38 SafepointTableBuilder* safepoints() { return &safepoints_; }
39 Zone* zone() const { return code()->zone(); }
41 // Checks if {block} will appear directly after {current_block_} when
42 // assembling code, in which case, a fall-through can be used.
43 bool IsNextInAssemblyOrder(const BasicBlock* block) const {
44 return block->rpo_number_ == (current_block_->rpo_number_ + 1) &&
45 block->deferred_ == current_block_->deferred_;
48 // Record a safepoint with the given pointer map.
49 void RecordSafepoint(PointerMap* pointers, Safepoint::Kind kind,
50 int arguments, Safepoint::DeoptMode deopt_mode);
52 // Assemble code for the specified instruction.
53 void AssembleInstruction(Instruction* instr);
54 void AssembleSourcePosition(SourcePositionInstruction* instr);
55 void AssembleGap(GapInstruction* gap);
57 // ===========================================================================
58 // ============= Architecture-specific code generation methods. ==============
59 // ===========================================================================
61 void AssembleArchInstruction(Instruction* instr);
62 void AssembleArchBranch(Instruction* instr, FlagsCondition condition);
63 void AssembleArchBoolean(Instruction* instr, FlagsCondition condition);
65 void AssembleDeoptimizerCall(int deoptimization_id);
67 // Generates an architecture-specific, descriptor-specific prologue
68 // to set up a stack frame.
69 void AssemblePrologue();
70 // Generates an architecture-specific, descriptor-specific return sequence
71 // to tear down a stack frame.
72 void AssembleReturn();
74 // ===========================================================================
75 // ============== Architecture-specific gap resolver methods. ================
76 // ===========================================================================
78 // Interface used by the gap resolver to emit moves and swaps.
79 virtual void AssembleMove(InstructionOperand* source,
80 InstructionOperand* destination) OVERRIDE;
81 virtual void AssembleSwap(InstructionOperand* source,
82 InstructionOperand* destination) OVERRIDE;
84 // ===========================================================================
85 // Deoptimization table construction
86 void AddSafepointAndDeopt(Instruction* instr);
87 void PopulateDeoptimizationData(Handle<Code> code);
88 int DefineDeoptimizationLiteral(Handle<Object> literal);
89 FrameStateDescriptor* GetFrameStateDescriptor(Instruction* instr,
90 size_t frame_state_offset);
91 int BuildTranslation(Instruction* instr, int pc_offset,
92 size_t frame_state_offset,
93 OutputFrameStateCombine state_combine);
94 void BuildTranslationForFrameStateDescriptor(
95 FrameStateDescriptor* descriptor, Instruction* instr,
96 Translation* translation, size_t frame_state_offset,
97 OutputFrameStateCombine state_combine);
98 void AddTranslationForOperand(Translation* translation, Instruction* instr,
99 InstructionOperand* op);
100 void AddNopForSmiCodeInlining();
101 void EnsureSpaceForLazyDeopt();
102 void MarkLazyDeoptSite();
104 // ===========================================================================
105 struct DeoptimizationState : ZoneObject {
107 BailoutId bailout_id() const { return bailout_id_; }
108 int translation_id() const { return translation_id_; }
109 int pc_offset() const { return pc_offset_; }
111 DeoptimizationState(BailoutId bailout_id, int translation_id, int pc_offset)
112 : bailout_id_(bailout_id),
113 translation_id_(translation_id),
114 pc_offset_(pc_offset) {}
117 BailoutId bailout_id_;
122 InstructionSequence* code_;
123 BasicBlock* current_block_;
124 SourcePosition current_source_position_;
125 MacroAssembler masm_;
126 GapResolver resolver_;
127 SafepointTableBuilder safepoints_;
128 ZoneDeque<DeoptimizationState*> deoptimization_states_;
129 ZoneDeque<Handle<Object> > deoptimization_literals_;
130 TranslationBuffer translations_;
131 int last_lazy_deopt_pc_;
134 } // namespace compiler
135 } // namespace internal
138 #endif // V8_COMPILER_CODE_GENERATOR_H