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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 INCLUDE_CPPGC_INTERNAL_NAME_TRAIT_H_
#define INCLUDE_CPPGC_INTERNAL_NAME_TRAIT_H_
#include <cstddef>
#include <cstdint>
#include <type_traits>
#include "cppgc/name-provider.h"
#include "v8config.h" // NOLINT(build/include_directory)
namespace cppgc {
namespace internal {
#if CPPGC_SUPPORTS_OBJECT_NAMES && defined(__clang__)
#define CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME 1
// Provides constexpr c-string storage for a name of fixed |Size| characters.
// Automatically appends terminating 0 byte.
template <size_t Size>
struct NameBuffer {
char name[Size + 1]{};
static constexpr NameBuffer FromCString(const char* str) {
NameBuffer result;
for (size_t i = 0; i < Size; ++i) result.name[i] = str[i];
result.name[Size] = 0;
return result;
}
};
template <typename T>
const char* GetTypename() {
static constexpr char kSelfPrefix[] =
"const char *cppgc::internal::GetTypename() [T =";
static_assert(__builtin_strncmp(__PRETTY_FUNCTION__, kSelfPrefix,
sizeof(kSelfPrefix) - 1) == 0,
"The prefix must match");
static constexpr const char* kTypenameStart =
__PRETTY_FUNCTION__ + sizeof(kSelfPrefix);
static constexpr size_t kTypenameSize =
__builtin_strlen(__PRETTY_FUNCTION__) - sizeof(kSelfPrefix) - 1;
// NameBuffer is an indirection that is needed to make sure that only a
// substring of __PRETTY_FUNCTION__ gets materialized in the binary.
static constexpr auto buffer =
NameBuffer<kTypenameSize>::FromCString(kTypenameStart);
return buffer.name;
}
#else
#define CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME 0
#endif
struct HeapObjectName {
const char* value;
bool name_was_hidden;
};
enum class HeapObjectNameForUnnamedObject : uint8_t {
kUseClassNameIfSupported,
kUseHiddenName,
};
class V8_EXPORT NameTraitBase {
protected:
static HeapObjectName GetNameFromTypeSignature(const char*);
};
// Trait that specifies how the garbage collector retrieves the name for a
// given object.
template <typename T>
class NameTrait final : public NameTraitBase {
public:
static constexpr bool HasNonHiddenName() {
#if CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME
return true;
#elif CPPGC_SUPPORTS_OBJECT_NAMES
return true;
#else // !CPPGC_SUPPORTS_OBJECT_NAMES
return std::is_base_of<NameProvider, T>::value;
#endif // !CPPGC_SUPPORTS_OBJECT_NAMES
}
static HeapObjectName GetName(
const void* obj, HeapObjectNameForUnnamedObject name_retrieval_mode) {
return GetNameFor(static_cast<const T*>(obj), name_retrieval_mode);
}
private:
static HeapObjectName GetNameFor(const NameProvider* name_provider,
HeapObjectNameForUnnamedObject) {
// Objects inheriting from `NameProvider` are not considered unnamed as
// users already provided a name for them.
return {name_provider->GetHumanReadableName(), false};
}
static HeapObjectName GetNameFor(
const void*, HeapObjectNameForUnnamedObject name_retrieval_mode) {
if (name_retrieval_mode == HeapObjectNameForUnnamedObject::kUseHiddenName)
return {NameProvider::kHiddenName, true};
#if CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME
return {GetTypename<T>(), false};
#elif CPPGC_SUPPORTS_OBJECT_NAMES
#if defined(V8_CC_GNU)
#define PRETTY_FUNCTION_VALUE __PRETTY_FUNCTION__
#elif defined(V8_CC_MSVC)
#define PRETTY_FUNCTION_VALUE __FUNCSIG__
#else
#define PRETTY_FUNCTION_VALUE nullptr
#endif
static const HeapObjectName leaky_name =
GetNameFromTypeSignature(PRETTY_FUNCTION_VALUE);
return leaky_name;
#undef PRETTY_FUNCTION_VALUE
#else // !CPPGC_SUPPORTS_OBJECT_NAMES
// We wanted to use a class name but were unable to provide one due to
// compiler limitations or build configuration. As such, return the hidden
// name with name_was_hidden=false, which will cause this object to be
// visible in the snapshot.
return {NameProvider::kHiddenName, false};
#endif // !CPPGC_SUPPORTS_OBJECT_NAMES
}
};
using NameCallback = HeapObjectName (*)(const void*,
HeapObjectNameForUnnamedObject);
} // namespace internal
} // namespace cppgc
#undef CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME
#endif // INCLUDE_CPPGC_INTERNAL_NAME_TRAIT_H_