1// Copyright 2012 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.
4
5#ifndef V8_CODEGEN_H_
6#define V8_CODEGEN_H_
7
8#include "src/code-stubs.h"
9#include "src/runtime.h"
10
11// Include the declaration of the architecture defined class CodeGenerator.
12// The contract  to the shared code is that the the CodeGenerator is a subclass
13// of Visitor and that the following methods are available publicly:
14//   MakeCode
15//   MakeCodePrologue
16//   MakeCodeEpilogue
17//   masm
18//   frame
19//   script
20//   has_valid_frame
21//   SetFrame
22//   DeleteFrame
23//   allocator
24//   AddDeferred
25//   in_spilled_code
26//   set_in_spilled_code
27//   RecordPositions
28//
29// These methods are either used privately by the shared code or implemented as
30// shared code:
31//   CodeGenerator
32//   ~CodeGenerator
33//   Generate
34//   ComputeLazyCompile
35//   BuildFunctionInfo
36//   ProcessDeclarations
37//   DeclareGlobals
38//   CheckForInlineRuntimeCall
39//   AnalyzeCondition
40//   CodeForFunctionPosition
41//   CodeForReturnPosition
42//   CodeForStatementPosition
43//   CodeForDoWhileConditionPosition
44//   CodeForSourcePosition
45
46enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
47
48#if V8_TARGET_ARCH_IA32
49#include "src/ia32/codegen-ia32.h"
50#elif V8_TARGET_ARCH_X64
51#include "src/x64/codegen-x64.h"
52#elif V8_TARGET_ARCH_ARM64
53#include "src/arm64/codegen-arm64.h"
54#elif V8_TARGET_ARCH_ARM
55#include "src/arm/codegen-arm.h"
56#elif V8_TARGET_ARCH_MIPS
57#include "src/mips/codegen-mips.h"
58#elif V8_TARGET_ARCH_X87
59#include "src/x87/codegen-x87.h"
60#else
61#error Unsupported target architecture.
62#endif
63
64namespace v8 {
65namespace internal {
66
67
68class CompilationInfo;
69
70
71class CodeGenerator {
72 public:
73  // Printing of AST, etc. as requested by flags.
74  static void MakeCodePrologue(CompilationInfo* info, const char* kind);
75
76  // Allocate and install the code.
77  static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
78                                       Code::Flags flags,
79                                       CompilationInfo* info);
80
81  // Print the code after compiling it.
82  static void PrintCode(Handle<Code> code, CompilationInfo* info);
83
84  static bool RecordPositions(MacroAssembler* masm,
85                              int pos,
86                              bool right_here = false);
87
88 private:
89  DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
90};
91
92
93// Results of the library implementation of transcendental functions may differ
94// from the one we use in our generated code.  Therefore we use the same
95// generated code both in runtime and compiled code.
96typedef double (*UnaryMathFunction)(double x);
97
98UnaryMathFunction CreateExpFunction();
99UnaryMathFunction CreateSqrtFunction();
100
101
102double modulo(double x, double y);
103
104// Custom implementation of math functions.
105double fast_exp(double input);
106double fast_sqrt(double input);
107#ifdef _WIN64
108void init_modulo_function();
109#endif
110void lazily_initialize_fast_exp();
111void init_fast_sqrt_function();
112
113
114class ElementsTransitionGenerator : public AllStatic {
115 public:
116  // If |mode| is set to DONT_TRACK_ALLOCATION_SITE,
117  // |allocation_memento_found| may be NULL.
118  static void GenerateMapChangeElementsTransition(MacroAssembler* masm,
119      AllocationSiteMode mode,
120      Label* allocation_memento_found);
121  static void GenerateSmiToDouble(MacroAssembler* masm,
122                                  AllocationSiteMode mode,
123                                  Label* fail);
124  static void GenerateDoubleToObject(MacroAssembler* masm,
125                                     AllocationSiteMode mode,
126                                     Label* fail);
127
128 private:
129  DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
130};
131
132static const int kNumberDictionaryProbes = 4;
133
134
135class CodeAgingHelper {
136 public:
137  CodeAgingHelper();
138
139  uint32_t young_sequence_length() const { return young_sequence_.length(); }
140  bool IsYoung(byte* candidate) const {
141    return memcmp(candidate,
142                  young_sequence_.start(),
143                  young_sequence_.length()) == 0;
144  }
145  void CopyYoungSequenceTo(byte* new_buffer) const {
146    CopyBytes(new_buffer, young_sequence_.start(), young_sequence_.length());
147  }
148
149#ifdef DEBUG
150  bool IsOld(byte* candidate) const;
151#endif
152
153 protected:
154  const EmbeddedVector<byte, kNoCodeAgeSequenceLength> young_sequence_;
155#ifdef DEBUG
156#ifdef V8_TARGET_ARCH_ARM64
157  const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
158#endif
159#endif
160};
161
162} }  // namespace v8::internal
163
164#endif  // V8_CODEGEN_H_
165