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