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// Copyright 2016 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_BUILTINS_UTILS_H_
#define V8_BUILTINS_BUILTINS_UTILS_H_
#include "src/base/logging.h"
#include "src/builtins/builtins.h"
#include "src/execution/arguments.h"
#include "src/execution/frame-constants.h"
#include "src/execution/isolate.h"
#include "src/heap/factory.h"
#include "src/logging/runtime-call-stats-scope.h"
namespace v8 {
namespace internal {
// Arguments object passed to C++ builtins.
class BuiltinArguments : public JavaScriptArguments {
public:
BuiltinArguments(int length, Address* arguments)
: Arguments(length, arguments) {
// Check we have at least the receiver.
DCHECK_LE(1, this->length());
}
Object operator[](int index) const {
DCHECK_LT(index, length());
return Object(*address_of_arg_at(index + kArgsOffset));
}
template <class S = Object>
Handle<S> at(int index) const {
DCHECK_LT(index, length());
return Handle<S>(address_of_arg_at(index + kArgsOffset));
}
inline void set_at(int index, Object value) {
DCHECK_LT(index, length());
*address_of_arg_at(index + kArgsOffset) = value.ptr();
}
// Note: this should return the address after the receiver,
// even when length() == 1.
inline Address* address_of_first_argument() const {
return address_of_arg_at(kFirstArgsOffset);
}
static constexpr int kNewTargetOffset = 0;
static constexpr int kTargetOffset = 1;
static constexpr int kArgcOffset = 2;
static constexpr int kPaddingOffset = 3;
static constexpr int kReceiverOffset = 4;
static constexpr int kNumExtraArgs = 4;
static constexpr int kNumExtraArgsWithReceiver = 5;
static constexpr int kArgsOffset = 4;
static_assert(kArgsOffset == kReceiverOffset);
static constexpr int kFirstArgsOffset = kArgsOffset + 1; // Skip receiver.
static constexpr int kReceiverArgsOffset = kArgsOffset - kFirstArgsOffset;
inline Handle<Object> atOrUndefined(Isolate* isolate, int index) const;
inline Handle<Object> receiver() const;
inline Handle<JSFunction> target() const;
inline Handle<HeapObject> new_target() const;
// Gets the total number of arguments including the receiver (but
// excluding extra arguments).
int length() const { return Arguments::length() - kNumExtraArgs; }
};
#define ASSERT_OFFSET(BuiltinsOffset, FrameOffset) \
static_assert(BuiltinArguments::BuiltinsOffset == \
(BuiltinExitFrameConstants::FrameOffset - \
BuiltinExitFrameConstants::kNewTargetOffset) / \
kSystemPointerSize)
ASSERT_OFFSET(kNewTargetOffset, kNewTargetOffset);
ASSERT_OFFSET(kTargetOffset, kTargetOffset);
ASSERT_OFFSET(kArgcOffset, kArgcOffset);
ASSERT_OFFSET(kPaddingOffset, kPaddingOffset);
ASSERT_OFFSET(kReceiverOffset, kFirstArgumentOffset);
#undef ASSERT_OFFSET
static_assert(BuiltinArguments::kNumExtraArgs ==
BuiltinExitFrameConstants::kNumExtraArgsWithoutReceiver);
static_assert(BuiltinArguments::kNumExtraArgsWithReceiver ==
BuiltinExitFrameConstants::kNumExtraArgsWithReceiver);
// ----------------------------------------------------------------------------
// Support macro for defining builtins in C++.
// ----------------------------------------------------------------------------
//
// A builtin function is defined by writing:
//
// BUILTIN(name) {
// ...
// }
//
// In the body of the builtin function the arguments can be accessed
// through the BuiltinArguments object args.
// TODO(cbruni): add global flag to check whether any tracing events have been
// enabled.
#define BUILTIN_RCS(name) \
V8_WARN_UNUSED_RESULT static Object Builtin_Impl_##name( \
BuiltinArguments args, Isolate* isolate); \
\
V8_NOINLINE static Address Builtin_Impl_Stats_##name( \
int args_length, Address* args_object, Isolate* isolate) { \
BuiltinArguments args(args_length, args_object); \
RCS_SCOPE(isolate, RuntimeCallCounterId::kBuiltin_##name); \
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"), \
"V8.Builtin_" #name); \
return BUILTIN_CONVERT_RESULT(Builtin_Impl_##name(args, isolate)); \
} \
\
V8_WARN_UNUSED_RESULT Address Builtin_##name( \
int args_length, Address* args_object, Isolate* isolate) { \
DCHECK(isolate->context().is_null() || isolate->context().IsContext()); \
if (V8_UNLIKELY(TracingFlags::is_runtime_stats_enabled())) { \
return Builtin_Impl_Stats_##name(args_length, args_object, isolate); \
} \
BuiltinArguments args(args_length, args_object); \
return BUILTIN_CONVERT_RESULT(Builtin_Impl_##name(args, isolate)); \
} \
\
V8_WARN_UNUSED_RESULT static Object Builtin_Impl_##name( \
BuiltinArguments args, Isolate* isolate)
#define BUILTIN_NO_RCS(name) \
V8_WARN_UNUSED_RESULT static Object Builtin_Impl_##name( \
BuiltinArguments args, Isolate* isolate); \
\
V8_WARN_UNUSED_RESULT Address Builtin_##name( \
int args_length, Address* args_object, Isolate* isolate) { \
DCHECK(isolate->context().is_null() || isolate->context().IsContext()); \
BuiltinArguments args(args_length, args_object); \
return BUILTIN_CONVERT_RESULT(Builtin_Impl_##name(args, isolate)); \
} \
\
V8_WARN_UNUSED_RESULT static Object Builtin_Impl_##name( \
BuiltinArguments args, Isolate* isolate)
#ifdef V8_RUNTIME_CALL_STATS
#define BUILTIN(name) BUILTIN_RCS(name)
#else // V8_RUNTIME_CALL_STATS
#define BUILTIN(name) BUILTIN_NO_RCS(name)
#endif // V8_RUNTIME_CALL_STATS
// ----------------------------------------------------------------------------
#define CHECK_RECEIVER(Type, name, method) \
if (!args.receiver()->Is##Type()) { \
THROW_NEW_ERROR_RETURN_FAILURE( \
isolate, \
NewTypeError(MessageTemplate::kIncompatibleMethodReceiver, \
isolate->factory()->NewStringFromAsciiChecked(method), \
args.receiver())); \
} \
Handle<Type> name = Handle<Type>::cast(args.receiver())
// Throws a TypeError for {method} if the receiver is not coercible to Object,
// or converts the receiver to a String otherwise and assigns it to a new var
// with the given {name}.
#define TO_THIS_STRING(name, method) \
if (args.receiver()->IsNullOrUndefined(isolate)) { \
THROW_NEW_ERROR_RETURN_FAILURE( \
isolate, \
NewTypeError(MessageTemplate::kCalledOnNullOrUndefined, \
isolate->factory()->NewStringFromAsciiChecked(method))); \
} \
Handle<String> name; \
ASSIGN_RETURN_FAILURE_ON_EXCEPTION( \
isolate, name, Object::ToString(isolate, args.receiver()))
} // namespace internal
} // namespace v8
#endif // V8_BUILTINS_BUILTINS_UTILS_H_
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