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comparison: security/sandbox/chromium/base/compiler_specific.h

security/sandbox/chromium/base/compiler_specific.h

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TOR_BUG_9701
changeset 14
925c144e1f1f
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-1:000000000000 0:c8d76f4b60ea
1 // Copyright (c) 2012 The Chromium 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 BASE_COMPILER_SPECIFIC_H_
6 #define BASE_COMPILER_SPECIFIC_H_
7
8 #include "build/build_config.h"
9
10 #if defined(COMPILER_MSVC)
11
12 // Macros for suppressing and disabling warnings on MSVC.
13 //
14 // Warning numbers are enumerated at:
15 // http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx
16 //
17 // The warning pragma:
18 // http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx
19 //
20 // Using __pragma instead of #pragma inside macros:
21 // http://msdn.microsoft.com/en-us/library/d9x1s805.aspx
22
23 // MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and
24 // for the next line of the source file.
25 #define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress:n))
26
27 // MSVC_PUSH_DISABLE_WARNING pushes |n| onto a stack of warnings to be disabled.
28 // The warning remains disabled until popped by MSVC_POP_WARNING.
29 #define MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \
30 __pragma(warning(disable:n))
31
32 // MSVC_PUSH_WARNING_LEVEL pushes |n| as the global warning level. The level
33 // remains in effect until popped by MSVC_POP_WARNING(). Use 0 to disable all
34 // warnings.
35 #define MSVC_PUSH_WARNING_LEVEL(n) __pragma(warning(push, n))
36
37 // Pop effects of innermost MSVC_PUSH_* macro.
38 #define MSVC_POP_WARNING() __pragma(warning(pop))
39
40 #define MSVC_DISABLE_OPTIMIZE() __pragma(optimize("", off))
41 #define MSVC_ENABLE_OPTIMIZE() __pragma(optimize("", on))
42
43 // Allows exporting a class that inherits from a non-exported base class.
44 // This uses suppress instead of push/pop because the delimiter after the
45 // declaration (either "," or "{") has to be placed before the pop macro.
46 //
47 // Example usage:
48 // class EXPORT_API Foo : NON_EXPORTED_BASE(public Bar) {
49 //
50 // MSVC Compiler warning C4275:
51 // non dll-interface class 'Bar' used as base for dll-interface class 'Foo'.
52 // Note that this is intended to be used only when no access to the base class'
53 // static data is done through derived classes or inline methods. For more info,
54 // see http://msdn.microsoft.com/en-us/library/3tdb471s(VS.80).aspx
55 #define NON_EXPORTED_BASE(code) MSVC_SUPPRESS_WARNING(4275) \
56 code
57
58 #else // Not MSVC
59
60 #define MSVC_SUPPRESS_WARNING(n)
61 #define MSVC_PUSH_DISABLE_WARNING(n)
62 #define MSVC_PUSH_WARNING_LEVEL(n)
63 #define MSVC_POP_WARNING()
64 #define MSVC_DISABLE_OPTIMIZE()
65 #define MSVC_ENABLE_OPTIMIZE()
66 #define NON_EXPORTED_BASE(code) code
67
68 #endif // COMPILER_MSVC
69
70
71 // Annotate a variable indicating it's ok if the variable is not used.
72 // (Typically used to silence a compiler warning when the assignment
73 // is important for some other reason.)
74 // Use like:
75 // int x ALLOW_UNUSED = ...;
76 #if defined(COMPILER_GCC)
77 #define ALLOW_UNUSED __attribute__((unused))
78 #else
79 #define ALLOW_UNUSED
80 #endif
81
82 // Annotate a function indicating it should not be inlined.
83 // Use like:
84 // NOINLINE void DoStuff() { ... }
85 #if defined(COMPILER_GCC)
86 #define NOINLINE __attribute__((noinline))
87 #elif defined(COMPILER_MSVC)
88 #define NOINLINE __declspec(noinline)
89 #else
90 #define NOINLINE
91 #endif
92
93 // Specify memory alignment for structs, classes, etc.
94 // Use like:
95 // class ALIGNAS(16) MyClass { ... }
96 // ALIGNAS(16) int array[4];
97 #if defined(COMPILER_MSVC)
98 #define ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
99 #elif defined(COMPILER_GCC)
100 #define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
101 #endif
102
103 // Return the byte alignment of the given type (available at compile time). Use
104 // sizeof(type) prior to checking __alignof to workaround Visual C++ bug:
105 // http://goo.gl/isH0C
106 // Use like:
107 // ALIGNOF(int32) // this would be 4
108 #if defined(COMPILER_MSVC)
109 #define ALIGNOF(type) (sizeof(type) - sizeof(type) + __alignof(type))
110 #elif defined(COMPILER_GCC)
111 #define ALIGNOF(type) __alignof__(type)
112 #endif
113
114 // Annotate a virtual method indicating it must be overriding a virtual
115 // method in the parent class.
116 // Use like:
117 // virtual void foo() OVERRIDE;
118 #if defined(COMPILER_MSVC)
119 #define OVERRIDE override
120 #elif defined(__clang__)
121 #define OVERRIDE override
122 #else
123 #define OVERRIDE
124 #endif
125
126 // Annotate a virtual method indicating that subclasses must not override it,
127 // or annotate a class to indicate that it cannot be subclassed.
128 // Use like:
129 // virtual void foo() FINAL;
130 // class B FINAL : public A {};
131 #if defined(COMPILER_MSVC)
132 // TODO(jered): Change this to "final" when chromium no longer uses MSVC 2010.
133 #define FINAL sealed
134 #elif defined(__clang__)
135 #define FINAL final
136 #else
137 #define FINAL
138 #endif
139
140 // Annotate a function indicating the caller must examine the return value.
141 // Use like:
142 // int foo() WARN_UNUSED_RESULT;
143 // To explicitly ignore a result, see |ignore_result()| in <base/basictypes.h>.
144 #if defined(COMPILER_GCC)
145 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
146 #else
147 #define WARN_UNUSED_RESULT
148 #endif
149
150 // Tell the compiler a function is using a printf-style format string.
151 // |format_param| is the one-based index of the format string parameter;
152 // |dots_param| is the one-based index of the "..." parameter.
153 // For v*printf functions (which take a va_list), pass 0 for dots_param.
154 // (This is undocumented but matches what the system C headers do.)
155 #if defined(COMPILER_GCC)
156 #define PRINTF_FORMAT(format_param, dots_param) \
157 __attribute__((format(printf, format_param, dots_param)))
158 #else
159 #define PRINTF_FORMAT(format_param, dots_param)
160 #endif
161
162 // WPRINTF_FORMAT is the same, but for wide format strings.
163 // This doesn't appear to yet be implemented in any compiler.
164 // See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38308 .
165 #define WPRINTF_FORMAT(format_param, dots_param)
166 // If available, it would look like:
167 // __attribute__((format(wprintf, format_param, dots_param)))
168
169
170 // MemorySanitizer annotations.
171 #ifdef MEMORY_SANITIZER
172 extern "C" {
173 void __msan_unpoison(const void *p, unsigned long s);
174 } // extern "C"
175
176 // Mark a memory region fully initialized.
177 // Use this to annotate code that deliberately reads uninitialized data, for
178 // example a GC scavenging root set pointers from the stack.
179 #define MSAN_UNPOISON(p, s) __msan_unpoison(p, s)
180 #else // MEMORY_SANITIZER
181 #define MSAN_UNPOISON(p, s)
182 #endif // MEMORY_SANITIZER
183
184 #endif // BASE_COMPILER_SPECIFIC_H_

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