Separate Simple Backend creation from initialization.
[chromium-blink-merge.git] / third_party / tcmalloc / chromium / src / stacktrace_generic-inl.h
blob5a526e228a1164853c1c327f9ce72e67ddb6a787
1 // Copyright (c) 2005, Google Inc.
2 // All rights reserved.
3 //
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7 //
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13 // distribution.
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18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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30 // ---
31 // Author: Sanjay Ghemawat
33 // Portable implementation - just use glibc
35 // Note: The glibc implementation may cause a call to malloc.
36 // This can cause a deadlock in HeapProfiler.
38 #ifndef BASE_STACKTRACE_GENERIC_INL_H_
39 #define BASE_STACKTRACE_GENERIC_INL_H_
40 // Note: this file is included into stacktrace.cc more than once.
41 // Anything that should only be defined once should be here:
43 #include <execinfo.h>
44 #include <string.h>
45 #include "gperftools/stacktrace.h"
46 #endif // BASE_STACKTRACE_GENERIC_INL_H_
48 // Note: this part of the file is included several times.
49 // Do not put globals below.
51 // The following 4 functions are generated from the code below:
52 // GetStack{Trace,Frames}()
53 // GetStack{Trace,Frames}WithContext()
55 // These functions take the following args:
56 // void** result: the stack-trace, as an array
57 // int* sizes: the size of each stack frame, as an array
58 // (GetStackFrames* only)
59 // int max_depth: the size of the result (and sizes) array(s)
60 // int skip_count: how many stack pointers to skip before storing in result
61 // void* ucp: a ucontext_t* (GetStack{Trace,Frames}WithContext only)
62 int GET_STACK_TRACE_OR_FRAMES {
63 static const int kStackLength = 64;
64 void * stack[kStackLength];
65 int size;
67 size = backtrace(stack, kStackLength);
68 skip_count++; // we want to skip the current frame as well
69 int result_count = size - skip_count;
70 if (result_count < 0)
71 result_count = 0;
72 if (result_count > max_depth)
73 result_count = max_depth;
74 for (int i = 0; i < result_count; i++)
75 result[i] = stack[i + skip_count];
77 #if IS_STACK_FRAMES
78 // No implementation for finding out the stack frame sizes yet.
79 memset(sizes, 0, sizeof(*sizes) * result_count);
80 #endif
82 return result_count;