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// Copyright 2020 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_BUILTINS_PROFILE_DATA_READER_H_
#define V8_BUILTINS_PROFILE_DATA_READER_H_
#include <cstddef>
#include <cstdint>
#include <map>
#include <vector>
#include "src/common/globals.h"
namespace v8 {
namespace internal {
class ProfileDataFromFile {
public:
// A hash of the function's Graph before scheduling. Allows us to avoid using
// profiling data if the function has been changed.
int hash() const { return hash_; }
// Returns the hint for a pair of blocks with the given IDs.
BranchHint GetHint(size_t true_block_id, size_t false_block_id) const {
auto it =
block_hints_by_id.find(std::make_pair(true_block_id, false_block_id));
if (it != block_hints_by_id.end()) {
return it->second ? BranchHint::kTrue : BranchHint::kFalse;
}
return BranchHint::kNone;
}
#ifdef LOG_BUILTIN_BLOCK_COUNT
uint64_t GetExecutedCount(size_t block_id) const {
if (executed_count_.count(block_id) == 0) return 0;
return executed_count_.at(block_id);
}
#endif
// Load basic block profiling data for the builtin with the given name, if
// such data exists. The returned vector is indexed by block ID, and its
// values are the number of times each block was executed while profiling.
static const ProfileDataFromFile* TryRead(const char* name);
protected:
int hash_ = 0;
// Branch hints, indicated by true or false to reflect the hinted result of
// the branch condition. The vector is indexed by the basic block ids of
// the two destinations of the branch.
std::map<std::pair<size_t, size_t>, bool> block_hints_by_id;
#ifdef LOG_BUILTIN_BLOCK_COUNT
std::unordered_map<size_t, uint64_t> executed_count_;
#endif
};
// The following strings can't be static members of ProfileDataFromFile until
// C++ 17; see https://stackoverflow.com/q/8016780/839379 . So for now we use a
// namespace.
namespace ProfileDataFromFileConstants {
// Any line in a v8.log beginning with this string represents a basic block
// counter.
static constexpr char kBlockCounterMarker[] = "block";
// Any line in the profile beginning with this string represents a basic block
// branch hint.
static constexpr char kBlockHintMarker[] = "block_hint";
// Any line in a v8.log beginning with this string represents the hash of the
// function Graph for a builtin.
static constexpr char kBuiltinHashMarker[] = "builtin_hash";
} // namespace ProfileDataFromFileConstants
} // namespace internal
} // namespace v8
#endif // V8_BUILTINS_PROFILE_DATA_READER_H_
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