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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_DEBUG_PROFILER_H_ | 5 #ifndef BASE_DEBUG_PROFILER_H_ |
6 #define BASE_DEBUG_PROFILER_H_ | 6 #define BASE_DEBUG_PROFILER_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include <string> | 10 #include <string> |
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31 | 31 |
32 // Returns true if process is being profiled. | 32 // Returns true if process is being profiled. |
33 BASE_EXPORT bool BeingProfiled(); | 33 BASE_EXPORT bool BeingProfiled(); |
34 | 34 |
35 // Reset profiling after a fork, which disables timers. | 35 // Reset profiling after a fork, which disables timers. |
36 BASE_EXPORT void RestartProfilingAfterFork(); | 36 BASE_EXPORT void RestartProfilingAfterFork(); |
37 | 37 |
38 // Returns true iff this executable is instrumented with the Syzygy profiler. | 38 // Returns true iff this executable is instrumented with the Syzygy profiler. |
39 BASE_EXPORT bool IsBinaryInstrumented(); | 39 BASE_EXPORT bool IsBinaryInstrumented(); |
40 | 40 |
| 41 // Returns true iff this executable supports profiling. |
| 42 BASE_EXPORT bool IsProfilingSupported(); |
| 43 |
41 // There's a class of profilers that use "return address swizzling" to get a | 44 // There's a class of profilers that use "return address swizzling" to get a |
42 // hook on function exits. This class of profilers uses some form of entry hook, | 45 // hook on function exits. This class of profilers uses some form of entry hook, |
43 // like e.g. binary instrumentation, or a compiler flag, that calls a hook each | 46 // like e.g. binary instrumentation, or a compiler flag, that calls a hook each |
44 // time a function is invoked. The hook then switches the return address on the | 47 // time a function is invoked. The hook then switches the return address on the |
45 // stack for the address of an exit hook function, and pushes the original | 48 // stack for the address of an exit hook function, and pushes the original |
46 // return address to a shadow stack of some type. When in due course the CPU | 49 // return address to a shadow stack of some type. When in due course the CPU |
47 // executes a return to the exit hook, the exit hook will do whatever work it | 50 // executes a return to the exit hook, the exit hook will do whatever work it |
48 // does on function exit, then arrange to return to the original return address. | 51 // does on function exit, then arrange to return to the original return address. |
49 // This class of profiler does not play well with programs that look at the | 52 // This class of profiler does not play well with programs that look at the |
50 // return address, as does e.g. V8. V8 uses the return address to certain | 53 // return address, as does e.g. V8. V8 uses the return address to certain |
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82 // Otherwise returns NULL. | 85 // Otherwise returns NULL. |
83 BASE_EXPORT ReturnAddressLocationResolver GetProfilerReturnAddrResolutionFunc(); | 86 BASE_EXPORT ReturnAddressLocationResolver GetProfilerReturnAddrResolutionFunc(); |
84 BASE_EXPORT DynamicFunctionEntryHook GetProfilerDynamicFunctionEntryHookFunc(); | 87 BASE_EXPORT DynamicFunctionEntryHook GetProfilerDynamicFunctionEntryHookFunc(); |
85 BASE_EXPORT AddDynamicSymbol GetProfilerAddDynamicSymbolFunc(); | 88 BASE_EXPORT AddDynamicSymbol GetProfilerAddDynamicSymbolFunc(); |
86 BASE_EXPORT MoveDynamicSymbol GetProfilerMoveDynamicSymbolFunc(); | 89 BASE_EXPORT MoveDynamicSymbol GetProfilerMoveDynamicSymbolFunc(); |
87 | 90 |
88 } // namespace debug | 91 } // namespace debug |
89 } // namespace base | 92 } // namespace base |
90 | 93 |
91 #endif // BASE_DEBUG_PROFILER_H_ | 94 #endif // BASE_DEBUG_PROFILER_H_ |
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