debug-coverage.h

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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef V8_DEBUG_DEBUG_COVERAGE_H_
#define V8_DEBUG_DEBUG_COVERAGE_H_
 
#include <memory>
#include <vector>
 
#include "src/debug/debug-interface.h"
#include "src/handles/handles.h"
 
namespace v8 {
namespace internal {
 
// Forward declaration.
class Isolate;
 
struct CoverageBlock {
  CoverageBlock(int s, int e, uint32_t c) : start(s), end(e), count(c) {}
  CoverageBlock() : CoverageBlock(kNoSourcePosition, kNoSourcePosition, 0) {}
 
  int start;
  int end;
  uint32_t count;
};
 
struct CoverageFunction {
  CoverageFunction(int s, int e, uint32_t c, Handle<String> n)
      : start(s), end(e), count(c), name(n), has_block_coverage(false) {}
 
  bool HasNonEmptySourceRange() const { return start < end && start >= 0; }
  bool HasBlocks() const { return !blocks.empty(); }
 
  int start;
  int end;
  uint32_t count;
  Handle<String> name;
  // Blocks are sorted by start position, from outer to inner blocks.
  std::vector<CoverageBlock> blocks;
  bool has_block_coverage;
};
 
struct CoverageScript {
  // Initialize top-level function in case it has been garbage-collected.
  explicit CoverageScript(Handle<Script> s) : script(s) {}
  Handle<Script> script;
  // Functions are sorted by start position, from outer to inner function.
  std::vector<CoverageFunction> functions;
};
 
class Coverage : public std::vector<CoverageScript> {
 public:
  // Collecting precise coverage only works if the modes kPreciseCount or
  // kPreciseBinary is selected. The invocation count is reset on collection.
  // In case of kPreciseCount, an updated count since last collection is
  // returned. In case of kPreciseBinary, a count of 1 is returned if a
  // function has been executed for the first time since last collection.
  static std::unique_ptr<Coverage> CollectPrecise(Isolate* isolate);
  // Collecting best effort coverage always works, but may be imprecise
  // depending on selected mode. The invocation count is not reset.
  static std::unique_ptr<Coverage> CollectBestEffort(Isolate* isolate);
 
  // Select code coverage mode.
  V8_EXPORT_PRIVATE static void SelectMode(Isolate* isolate,
                                           debug::CoverageMode mode);
 
 private:
  static std::unique_ptr<Coverage> Collect(
      Isolate* isolate, v8::debug::CoverageMode collectionMode);
 
  Coverage() = default;
};
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_DEBUG_DEBUG_COVERAGE_H_