// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_RUNTIME_RUNTIME_UTILS_H_
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#define V8_RUNTIME_RUNTIME_UTILS_H_
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#include "src/base/logging.h"
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#include "src/globals.h"
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#include "src/runtime/runtime.h"
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namespace v8 {
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namespace internal {
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// Cast the given object to a value of the specified type and store
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// it in a variable with the given name. If the object is not of the
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// expected type we crash safely.
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#define CONVERT_ARG_CHECKED(Type, name, index) \
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CHECK(args[index]->Is##Type()); \
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Type* name = Type::cast(args[index]);
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#define CONVERT_ARG_HANDLE_CHECKED(Type, name, index) \
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CHECK(args[index]->Is##Type()); \
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Handle<Type> name = args.at<Type>(index);
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#define CONVERT_NUMBER_ARG_HANDLE_CHECKED(name, index) \
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CHECK(args[index]->IsNumber()); \
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Handle<Object> name = args.at(index);
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// Cast the given object to a boolean and store it in a variable with
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// the given name. If the object is not a boolean we crash safely.
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#define CONVERT_BOOLEAN_ARG_CHECKED(name, index) \
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CHECK(args[index]->IsBoolean()); \
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bool name = args[index]->IsTrue(isolate);
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// Cast the given argument to a Smi and store its value in an int variable
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// with the given name. If the argument is not a Smi we crash safely.
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#define CONVERT_SMI_ARG_CHECKED(name, index) \
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CHECK(args[index]->IsSmi()); \
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int name = args.smi_at(index);
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// Cast the given argument to a double and store it in a variable with
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// the given name. If the argument is not a number (as opposed to
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// the number not-a-number) we crash safely.
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#define CONVERT_DOUBLE_ARG_CHECKED(name, index) \
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CHECK(args[index]->IsNumber()); \
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double name = args.number_at(index);
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// Cast the given argument to a size_t and store its value in a variable with
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// the given name. If the argument is not a size_t we crash safely.
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#define CONVERT_SIZE_ARG_CHECKED(name, index) \
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CHECK(args[index]->IsNumber()); \
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Handle<Object> name##_object = args.at(index); \
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size_t name = 0; \
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CHECK(TryNumberToSize(*name##_object, &name));
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// Call the specified converter on the object *comand store the result in
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// a variable of the specified type with the given name. If the
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// object is not a Number we crash safely.
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#define CONVERT_NUMBER_CHECKED(type, name, Type, obj) \
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CHECK(obj->IsNumber()); \
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type name = NumberTo##Type(obj);
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// Cast the given argument to PropertyDetails and store its value in a
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// variable with the given name. If the argument is not a Smi we crash safely.
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#define CONVERT_PROPERTY_DETAILS_CHECKED(name, index) \
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CHECK(args[index]->IsSmi()); \
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PropertyDetails name = PropertyDetails(Smi::cast(args[index]));
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// Assert that the given argument has a valid value for a LanguageMode
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// and store it in a LanguageMode variable with the given name.
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#define CONVERT_LANGUAGE_MODE_ARG_CHECKED(name, index) \
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CHECK(args[index]->IsNumber()); \
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int32_t __tmp_##name = 0; \
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CHECK(args[index]->ToInt32(&__tmp_##name)); \
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CHECK(is_valid_language_mode(__tmp_##name)); \
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LanguageMode name = static_cast<LanguageMode>(__tmp_##name);
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// Assert that the given argument is a number within the Int32 range
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// and convert it to int32_t. If the argument is not an Int32 we crash safely.
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#define CONVERT_INT32_ARG_CHECKED(name, index) \
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CHECK(args[index]->IsNumber()); \
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int32_t name = 0; \
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CHECK(args[index]->ToInt32(&name));
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// Assert that the given argument is a number within the Uint32 range
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// and convert it to uint32_t. If the argument is not an Uint32 call
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// IllegalOperation and return.
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#define CONVERT_UINT32_ARG_CHECKED(name, index) \
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CHECK(args[index]->IsNumber()); \
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uint32_t name = 0; \
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CHECK(args[index]->ToUint32(&name));
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// Cast the given argument to PropertyAttributes and store its value in a
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// variable with the given name. If the argument is not a Smi or the
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// enum value is out of range, we crash safely.
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#define CONVERT_PROPERTY_ATTRIBUTES_CHECKED(name, index) \
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CHECK(args[index]->IsSmi()); \
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CHECK_EQ(args.smi_at(index) & ~(READ_ONLY | DONT_ENUM | DONT_DELETE), 0); \
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PropertyAttributes name = static_cast<PropertyAttributes>(args.smi_at(index));
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// A mechanism to return a pair of Object pointers in registers (if possible).
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// How this is achieved is calling convention-dependent.
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// All currently supported x86 compiles uses calling conventions that are cdecl
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// variants where a 64-bit value is returned in two 32-bit registers
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// (edx:eax on ia32, r1:r0 on ARM).
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// In AMD-64 calling convention a struct of two pointers is returned in rdx:rax.
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// In Win64 calling convention, a struct of two pointers is returned in memory,
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// allocated by the caller, and passed as a pointer in a hidden first parameter.
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#ifdef V8_HOST_ARCH_64_BIT
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struct ObjectPair {
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Object* x;
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Object* y;
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};
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static inline ObjectPair MakePair(Object* x, Object* y) {
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ObjectPair result = {x, y};
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// Pointers x and y returned in rax and rdx, in AMD-x64-abi.
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// In Win64 they are assigned to a hidden first argument.
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return result;
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}
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#elif V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT
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// For x32 a 128-bit struct return is done as rax and rdx from the ObjectPair
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// are used in generated code. An alternative is using uint64_t and modifying
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// generated code.
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struct ObjectPair {
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Object* x;
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uint32_t x_upper;
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Object* y;
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uint32_t y_upper;
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};
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static inline ObjectPair MakePair(Object* x, Object* y) {
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ObjectPair result = {x, 0, y, 0};
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// Pointers x and y returned in rax and rdx, in x32-abi.
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return result;
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}
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#else
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typedef uint64_t ObjectPair;
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static inline ObjectPair MakePair(Object* x, Object* y) {
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#if defined(V8_TARGET_LITTLE_ENDIAN)
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return reinterpret_cast<uint32_t>(x) |
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(reinterpret_cast<ObjectPair>(y) << 32);
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#elif defined(V8_TARGET_BIG_ENDIAN)
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return reinterpret_cast<uint32_t>(y) |
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(reinterpret_cast<ObjectPair>(x) << 32);
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#else
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#error Unknown endianness
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#endif
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}
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#endif
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} // namespace internal
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} // namespace v8
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#endif // V8_RUNTIME_RUNTIME_UTILS_H_
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