codegen.h 4.74 KB
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// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
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#ifndef V8_CODEGEN_H_
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#define V8_CODEGEN_H_
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#include "src/code-stubs.h"
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#include "src/runtime/runtime.h"
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// Include the declaration of the architecture defined class CodeGenerator.
// The contract  to the shared code is that the the CodeGenerator is a subclass
// of Visitor and that the following methods are available publicly:
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//   MakeCode
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//   MakeCodePrologue
//   MakeCodeEpilogue
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//   masm
//   frame
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//   script
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//   has_valid_frame
//   SetFrame
//   DeleteFrame
//   allocator
//   AddDeferred
//   in_spilled_code
//   set_in_spilled_code
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//   RecordPositions
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//
// These methods are either used privately by the shared code or implemented as
// shared code:
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//   CodeGenerator
//   ~CodeGenerator
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//   Generate
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//   ComputeLazyCompile
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//   BuildFunctionInfo
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//   ProcessDeclarations
//   DeclareGlobals
//   CheckForInlineRuntimeCall
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//   AnalyzeCondition
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//   CodeForFunctionPosition
//   CodeForReturnPosition
//   CodeForStatementPosition
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//   CodeForDoWhileConditionPosition
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//   CodeForSourcePosition
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enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };

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#if V8_TARGET_ARCH_IA32
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#include "src/ia32/codegen-ia32.h"  // NOLINT
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#elif V8_TARGET_ARCH_X64
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#include "src/x64/codegen-x64.h"  // NOLINT
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#elif V8_TARGET_ARCH_ARM64
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#include "src/arm64/codegen-arm64.h"  // NOLINT
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#elif V8_TARGET_ARCH_ARM
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#include "src/arm/codegen-arm.h"  // NOLINT
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#elif V8_TARGET_ARCH_MIPS
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#include "src/mips/codegen-mips.h"  // NOLINT
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#elif V8_TARGET_ARCH_MIPS64
#include "src/mips64/codegen-mips64.h"  // NOLINT
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#elif V8_TARGET_ARCH_X87
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#include "src/x87/codegen-x87.h"  // NOLINT
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#else
#error Unsupported target architecture.
#endif
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namespace v8 {
namespace internal {

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class CompilationInfo;


class CodeGenerator {
 public:
  // Printing of AST, etc. as requested by flags.
  static void MakeCodePrologue(CompilationInfo* info, const char* kind);

  // Allocate and install the code.
  static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
                                       Code::Flags flags,
                                       CompilationInfo* info);

  // Print the code after compiling it.
  static void PrintCode(Handle<Code> code, CompilationInfo* info);

  static bool RecordPositions(MacroAssembler* masm,
                              int pos,
                              bool right_here = false);

 private:
  DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
};


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// Results of the library implementation of transcendental functions may differ
// from the one we use in our generated code.  Therefore we use the same
// generated code both in runtime and compiled code.
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typedef double (*UnaryMathFunction)(double x);
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UnaryMathFunction CreateExpFunction();
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UnaryMathFunction CreateSqrtFunction();
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double modulo(double x, double y);

// Custom implementation of math functions.
double fast_exp(double input);
double fast_sqrt(double input);
#ifdef _WIN64
void init_modulo_function();
#endif
void lazily_initialize_fast_exp();
void init_fast_sqrt_function();


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class ElementsTransitionGenerator : public AllStatic {
 public:
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  // If |mode| is set to DONT_TRACK_ALLOCATION_SITE,
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  // |allocation_memento_found| may be NULL.
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  static void GenerateMapChangeElementsTransition(
      MacroAssembler* masm,
      Register receiver,
      Register key,
      Register value,
      Register target_map,
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      AllocationSiteMode mode,
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      Label* allocation_memento_found);
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  static void GenerateSmiToDouble(
      MacroAssembler* masm,
      Register receiver,
      Register key,
      Register value,
      Register target_map,
      AllocationSiteMode mode,
      Label* fail);
  static void GenerateDoubleToObject(
      MacroAssembler* masm,
      Register receiver,
      Register key,
      Register value,
      Register target_map,
      AllocationSiteMode mode,
      Label* fail);
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 private:
  DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
};

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static const int kNumberDictionaryProbes = 4;

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class CodeAgingHelper {
 public:
  CodeAgingHelper();

  uint32_t young_sequence_length() const { return young_sequence_.length(); }
  bool IsYoung(byte* candidate) const {
    return memcmp(candidate,
                  young_sequence_.start(),
                  young_sequence_.length()) == 0;
  }
  void CopyYoungSequenceTo(byte* new_buffer) const {
    CopyBytes(new_buffer, young_sequence_.start(), young_sequence_.length());
  }

#ifdef DEBUG
  bool IsOld(byte* candidate) const;
#endif

 protected:
  const EmbeddedVector<byte, kNoCodeAgeSequenceLength> young_sequence_;
#ifdef DEBUG
#ifdef V8_TARGET_ARCH_ARM64
  const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
#endif
#endif
};

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} }  // namespace v8::internal

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#endif  // V8_CODEGEN_H_