1 // Copyright 2014 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_RUNTIME_RUNTIME_UTILS_H_ 6 #define V8_RUNTIME_RUNTIME_UTILS_H_ 7 8 #include "src/base/logging.h" 9 #include "src/runtime/runtime.h" 10 11 namespace v8 { 12 namespace internal { 13 14 // Cast the given object to a value of the specified type and store 15 // it in a variable with the given name. If the object is not of the 16 // expected type we crash safely. 17 #define CONVERT_ARG_CHECKED(Type, name, index) \ 18 CHECK(args[index]->Is##Type()); \ 19 Type* name = Type::cast(args[index]); 20 21 #define CONVERT_ARG_HANDLE_CHECKED(Type, name, index) \ 22 CHECK(args[index]->Is##Type()); \ 23 Handle<Type> name = args.at<Type>(index); 24 25 #define CONVERT_NUMBER_ARG_HANDLE_CHECKED(name, index) \ 26 CHECK(args[index]->IsNumber()); \ 27 Handle<Object> name = args.at<Object>(index); 28 29 // Cast the given object to a boolean and store it in a variable with 30 // the given name. If the object is not a boolean we crash safely. 31 #define CONVERT_BOOLEAN_ARG_CHECKED(name, index) \ 32 CHECK(args[index]->IsBoolean()); \ 33 bool name = args[index]->IsTrue(isolate); 34 35 // Cast the given argument to a Smi and store its value in an int variable 36 // with the given name. If the argument is not a Smi we crash safely. 37 #define CONVERT_SMI_ARG_CHECKED(name, index) \ 38 CHECK(args[index]->IsSmi()); \ 39 int name = args.smi_at(index); 40 41 // Cast the given argument to a double and store it in a variable with 42 // the given name. If the argument is not a number (as opposed to 43 // the number not-a-number) we crash safely. 44 #define CONVERT_DOUBLE_ARG_CHECKED(name, index) \ 45 CHECK(args[index]->IsNumber()); \ 46 double name = args.number_at(index); 47 48 // Cast the given argument to a size_t and store its value in a variable with 49 // the given name. If the argument is not a size_t we crash safely. 50 #define CONVERT_SIZE_ARG_CHECKED(name, index) \ 51 CHECK(args[index]->IsNumber()); \ 52 Handle<Object> name##_object = args.at<Object>(index); \ 53 size_t name = 0; \ 54 CHECK(TryNumberToSize(*name##_object, &name)); 55 56 // Call the specified converter on the object *comand store the result in 57 // a variable of the specified type with the given name. If the 58 // object is not a Number we crash safely. 59 #define CONVERT_NUMBER_CHECKED(type, name, Type, obj) \ 60 CHECK(obj->IsNumber()); \ 61 type name = NumberTo##Type(obj); 62 63 // Cast the given argument to PropertyDetails and store its value in a 64 // variable with the given name. If the argument is not a Smi we crash safely. 65 #define CONVERT_PROPERTY_DETAILS_CHECKED(name, index) \ 66 CHECK(args[index]->IsSmi()); \ 67 PropertyDetails name = PropertyDetails(Smi::cast(args[index])); 68 69 // Assert that the given argument has a valid value for a LanguageMode 70 // and store it in a LanguageMode variable with the given name. 71 #define CONVERT_LANGUAGE_MODE_ARG_CHECKED(name, index) \ 72 CHECK(args[index]->IsNumber()); \ 73 int32_t __tmp_##name = 0; \ 74 CHECK(args[index]->ToInt32(&__tmp_##name)); \ 75 CHECK(is_valid_language_mode(__tmp_##name)); \ 76 LanguageMode name = static_cast<LanguageMode>(__tmp_##name); 77 78 // Assert that the given argument is a number within the Int32 range 79 // and convert it to int32_t. If the argument is not an Int32 we crash safely. 80 #define CONVERT_INT32_ARG_CHECKED(name, index) \ 81 CHECK(args[index]->IsNumber()); \ 82 int32_t name = 0; \ 83 CHECK(args[index]->ToInt32(&name)); 84 85 // Assert that the given argument is a number within the Uint32 range 86 // and convert it to uint32_t. If the argument is not an Uint32 call 87 // IllegalOperation and return. 88 #define CONVERT_UINT32_ARG_CHECKED(name, index) \ 89 CHECK(args[index]->IsNumber()); \ 90 uint32_t name = 0; \ 91 CHECK(args[index]->ToUint32(&name)); 92 93 // Cast the given argument to PropertyAttributes and store its value in a 94 // variable with the given name. If the argument is not a Smi or the 95 // enum value is out of range, we crash safely. 96 #define CONVERT_PROPERTY_ATTRIBUTES_CHECKED(name, index) \ 97 CHECK(args[index]->IsSmi()); \ 98 CHECK((args.smi_at(index) & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0); \ 99 PropertyAttributes name = static_cast<PropertyAttributes>(args.smi_at(index)); 100 101 // A mechanism to return a pair of Object pointers in registers (if possible). 102 // How this is achieved is calling convention-dependent. 103 // All currently supported x86 compiles uses calling conventions that are cdecl 104 // variants where a 64-bit value is returned in two 32-bit registers 105 // (edx:eax on ia32, r1:r0 on ARM). 106 // In AMD-64 calling convention a struct of two pointers is returned in rdx:rax. 107 // In Win64 calling convention, a struct of two pointers is returned in memory, 108 // allocated by the caller, and passed as a pointer in a hidden first parameter. 109 #ifdef V8_HOST_ARCH_64_BIT 110 struct ObjectPair { 111 Object* x; 112 Object* y; 113 }; 114 115 116 static inline ObjectPair MakePair(Object* x, Object* y) { 117 ObjectPair result = {x, y}; 118 // Pointers x and y returned in rax and rdx, in AMD-x64-abi. 119 // In Win64 they are assigned to a hidden first argument. 120 return result; 121 } 122 #elif V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT 123 // For x32 a 128-bit struct return is done as rax and rdx from the ObjectPair 124 // are used in the full codegen and Crankshaft compiler. An alternative is 125 // using uint64_t and modifying full codegen and Crankshaft compiler. 126 struct ObjectPair { 127 Object* x; 128 uint32_t x_upper; 129 Object* y; 130 uint32_t y_upper; 131 }; 132 133 134 static inline ObjectPair MakePair(Object* x, Object* y) { 135 ObjectPair result = {x, 0, y, 0}; 136 // Pointers x and y returned in rax and rdx, in x32-abi. 137 return result; 138 } 139 #else 140 typedef uint64_t ObjectPair; 141 static inline ObjectPair MakePair(Object* x, Object* y) { 142 #if defined(V8_TARGET_LITTLE_ENDIAN) 143 return reinterpret_cast<uint32_t>(x) | 144 (reinterpret_cast<ObjectPair>(y) << 32); 145 #elif defined(V8_TARGET_BIG_ENDIAN) 146 return reinterpret_cast<uint32_t>(y) | 147 (reinterpret_cast<ObjectPair>(x) << 32); 148 #else 149 #error Unknown endianness 150 #endif 151 } 152 #endif 153 154 155 // A mechanism to return a triple of Object pointers. In all calling 156 // conventions, a struct of two pointers is returned in memory, 157 // allocated by the caller, and passed as a pointer in a hidden first parameter. 158 struct ObjectTriple { 159 Object* x; 160 Object* y; 161 Object* z; 162 }; 163 164 static inline ObjectTriple MakeTriple(Object* x, Object* y, Object* z) { 165 ObjectTriple result = {x, y, z}; 166 // ObjectTriple is assigned to a hidden first argument. 167 return result; 168 } 169 170 } // namespace internal 171 } // namespace v8 172 173 #endif // V8_RUNTIME_RUNTIME_UTILS_H_ 174
