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// Copyright 2019 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_TOOLS_DEBUG_HELPER_HEAP_CONSTANTS_H_
#define V8_TOOLS_DEBUG_HELPER_HEAP_CONSTANTS_H_
#include <cstdint>
#include <string>
#include <vector>
#include "debug-helper.h"
#include "src/objects/instance-type.h"
namespace d = v8::debug_helper;
namespace v8 {
namespace internal {
namespace debug_helper_internal {
// ===== Functions generated by gen-heap-constants.py: =========================
// Returns the name of a known object, given its offset within the first page of
// the space, or empty string on failure.
std::string FindKnownObjectInOldSpace(uintptr_t offset);
std::string FindKnownObjectInReadOnlySpace(uintptr_t offset);
std::string FindKnownObjectInMapSpace(uintptr_t offset);
// In builds with pointer compression enabled, sets the *_first_page members in
// the HeapAddresses object. In other builds, does nothing.
void FillInUnknownHeapAddresses(d::HeapAddresses* heap_addresses,
uintptr_t any_uncompressed_ptr);
// Returns the instance type for the known Map, given its offset within the
// first page of the space, or empty string on failure.
int FindKnownMapInstanceTypeInMapSpace(uintptr_t offset);
int FindKnownMapInstanceTypeInReadOnlySpace(uintptr_t offset);
// ===== End of generated functions. ===========================================
// Returns a descriptive string if the given address matches a known object, or
// an empty string otherwise.
std::string FindKnownObject(uintptr_t address,
const d::HeapAddresses& heap_addresses);
struct KnownInstanceType {
enum class Confidence {
kLow,
kHigh,
};
KnownInstanceType() : confidence(Confidence::kLow) {}
KnownInstanceType(int type) : KnownInstanceType() {
if (type >= 0) {
confidence = Confidence::kHigh;
types.push_back(static_cast<v8::internal::InstanceType>(type));
}
}
Confidence confidence;
std::vector<v8::internal::InstanceType> types;
};
// Returns information about the instance type of the Map at the given address,
// based on the list of known Maps.
KnownInstanceType FindKnownMapInstanceTypes(
uintptr_t address, const d::HeapAddresses& heap_addresses);
} // namespace debug_helper_internal
} // namespace internal
} // namespace v8
#endif
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