JitCodeAPI.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* SpiderMonkey API for obtaining JitCode information. */

#ifndef js_JitCodeAPI_h

#define js_JitCodeAPI_h

#include "js/AllocPolicy.h"

#include "js/ColumnNumber.h"  // JS::LimitedColumnNumberOneOrigin

#include "js/Initialization.h"

#include "js/Printf.h"

#include "js/Vector.h"

namespace JS {

enum class JitTier { Baseline, IC, Ion, Other };

class JitOpcodeDictionary {

  typedef js::Vector<UniqueChars, 0, js::SystemAllocPolicy> StringVector;

 public:

  JitOpcodeDictionary();

  StringVector& GetBaselineDictionary() { return baselineDictionary; }

  StringVector& GetIonDictionary() { return ionDictionary; }

  StringVector& GetInlineCacheDictionary() { return icDictionary; }

 private:

  StringVector baselineDictionary;

  StringVector icDictionary;

  StringVector ionDictionary;

};

struct JitCodeSourceInfo {

  UniqueChars filename;

  uint32_t offset = 0;

  // Line number (1-origin).

  uint32_t lineno = 0;

  // Column number in UTF-16 code units.

  JS::LimitedColumnNumberOneOrigin colno;

};

struct JitCodeIRInfo {

  uint32_t offset = 0;

  uint32_t opcode = 0;

  UniqueChars str;

};

typedef js::Vector<JitCodeSourceInfo, 0, js::SystemAllocPolicy>

    SourceInfoVector;

typedef js::Vector<JitCodeIRInfo, 0, js::SystemAllocPolicy> IRInfoVector;

struct JitCodeRecord {

  UniqueChars functionName;

  uint64_t code_addr = 0;

  uint32_t instructionSize = 0;

  JitTier tier = JitTier::Other;

  SourceInfoVector sourceInfo;

  IRInfoVector irInfo;

};

class JitCodeIterator {

  void getDataForIndex(size_t iteratorIndex);

 public:

  JitCodeIterator();

  ~JitCodeIterator();

  void operator++(int) {

    iteratorIndex++;

    getDataForIndex(iteratorIndex);

  explicit operator bool() const { return data != nullptr; }

  SourceInfoVector& sourceData() { return data->sourceInfo; }

  IRInfoVector& irData() { return data->irInfo; }

  const char* functionName() const { return data->functionName.get(); }

  uint64_t code_addr() const { return data->code_addr; }

  uint32_t instructionSize() { return data->instructionSize; }

  JitTier jit_tier() const { return data->tier; }

 private:

  JitCodeRecord* data = nullptr;

  size_t iteratorIndex = 0;

};

}  // namespace JS

#endif /* js_JitCodeAPI_h */