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"  // NOLINT
50#elif V8_TARGET_ARCH_X64
51#include "src/x64/codegen-x64.h"  // NOLINT
52#elif V8_TARGET_ARCH_ARM64
53#include "src/arm64/codegen-arm64.h"  // NOLINT
54#elif V8_TARGET_ARCH_ARM
55#include "src/arm/codegen-arm.h"  // NOLINT
56#elif V8_TARGET_ARCH_MIPS
57#include "src/mips/codegen-mips.h"  // NOLINT
58#elif V8_TARGET_ARCH_MIPS64
59#include "src/mips64/codegen-mips64.h"  // NOLINT
60#elif V8_TARGET_ARCH_X87
61#include "src/x87/codegen-x87.h"  // NOLINT
62#else
63#error Unsupported target architecture.
64#endif
65
66namespace v8 {
67namespace internal {
68
69
70class CompilationInfo;
71
72
73class CodeGenerator {
74 public:
75  // Printing of AST, etc. as requested by flags.
76  static void MakeCodePrologue(CompilationInfo* info, const char* kind);
77
78  // Allocate and install the code.
79  static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
80                                       Code::Flags flags,
81                                       CompilationInfo* info);
82
83  // Print the code after compiling it.
84  static void PrintCode(Handle<Code> code, CompilationInfo* info);
85
86  static bool RecordPositions(MacroAssembler* masm,
87                              int pos,
88                              bool right_here = false);
89
90 private:
91  DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
92};
93
94
95// Results of the library implementation of transcendental functions may differ
96// from the one we use in our generated code.  Therefore we use the same
97// generated code both in runtime and compiled code.
98typedef double (*UnaryMathFunction)(double x);
99
100UnaryMathFunction CreateExpFunction();
101UnaryMathFunction CreateSqrtFunction();
102
103
104double modulo(double x, double y);
105
106// Custom implementation of math functions.
107double fast_exp(double input);
108double fast_sqrt(double input);
109#ifdef _WIN64
110void init_modulo_function();
111#endif
112void lazily_initialize_fast_exp();
113void init_fast_sqrt_function();
114
115
116class ElementsTransitionGenerator : public AllStatic {
117 public:
118  // If |mode| is set to DONT_TRACK_ALLOCATION_SITE,
119  // |allocation_memento_found| may be NULL.
120  static void GenerateMapChangeElementsTransition(
121      MacroAssembler* masm,
122      Register receiver,
123      Register key,
124      Register value,
125      Register target_map,
126      AllocationSiteMode mode,
127      Label* allocation_memento_found);
128  static void GenerateSmiToDouble(
129      MacroAssembler* masm,
130      Register receiver,
131      Register key,
132      Register value,
133      Register target_map,
134      AllocationSiteMode mode,
135      Label* fail);
136  static void GenerateDoubleToObject(
137      MacroAssembler* masm,
138      Register receiver,
139      Register key,
140      Register value,
141      Register target_map,
142      AllocationSiteMode mode,
143      Label* fail);
144
145 private:
146  DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
147};
148
149static const int kNumberDictionaryProbes = 4;
150
151
152class CodeAgingHelper {
153 public:
154  CodeAgingHelper();
155
156  uint32_t young_sequence_length() const { return young_sequence_.length(); }
157  bool IsYoung(byte* candidate) const {
158    return memcmp(candidate,
159                  young_sequence_.start(),
160                  young_sequence_.length()) == 0;
161  }
162  void CopyYoungSequenceTo(byte* new_buffer) const {
163    CopyBytes(new_buffer, young_sequence_.start(), young_sequence_.length());
164  }
165
166#ifdef DEBUG
167  bool IsOld(byte* candidate) const;
168#endif
169
170 protected:
171  const EmbeddedVector<byte, kNoCodeAgeSequenceLength> young_sequence_;
172#ifdef DEBUG
173#ifdef V8_TARGET_ARCH_ARM64
174  const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
175#endif
176#endif
177};
178
179} }  // namespace v8::internal
180
181#endif  // V8_CODEGEN_H_
182