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comparison src/profile.h @ 4162:8f6a825eb3d3

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[xemacs-hg @ 2007-09-04 21:20:18 by aidan] Eliminate a crash when profiling; only pass the backtrace record to profile_record_about_to_call, profile_record_just_called when it's non-nil.
author aidan
date Tue, 04 Sep 2007 21:20:26 +0000
parents 390dee4913ba
children 308d34e9f07d
comparison
equal deleted inserted replaced
4161:08efedad2696 4162:8f6a825eb3d3
45 45
46 /* As just mentioned, we rely on the dynamic value of profiling_active. 46 /* As just mentioned, we rely on the dynamic value of profiling_active.
47 This ensures correct behavior (e.g. we never modify the profiling info 47 This ensures correct behavior (e.g. we never modify the profiling info
48 when profiling is not active) because we seed and reap all functions 48 when profiling is not active) because we seed and reap all functions
49 currently on the stack when starting and stopping. See 49 currently on the stack when starting and stopping. See
50 `start-profiling'. */ 50 `start-profiling'.
51
52 We check do_backtrace to make sure that the backtrace structure is
53 initialised. If it isn't, we can enter a function with profiling turned
54 off, and exit it with it turned on, with the consequence that an
55 unitialised backtrace structure is passed to
56 profile_record_just_called. Since do_backtrace is function-local (apart
57 from in the garbage collector) this avoids that. */
51 #define PROFILE_ENTER_FUNCTION() \ 58 #define PROFILE_ENTER_FUNCTION() \
52 do \ 59 do \
53 { \ 60 { \
54 if (profiling_active) \ 61 if (profiling_active && do_backtrace) \
55 profile_record_about_to_call (&backtrace); \ 62 profile_record_about_to_call (&backtrace); \
56 } \ 63 } \
57 while (0) 64 while (0)
58 65
59 #define PROFILE_EXIT_FUNCTION() \ 66 #define PROFILE_EXIT_FUNCTION() \
60 do \ 67 do \
61 { \ 68 { \
62 if (profiling_active) \ 69 if (profiling_active && do_backtrace) \
63 profile_record_just_called (&backtrace); \ 70 profile_record_just_called (&backtrace); \
64 } \ 71 } \
65 while (0) 72 while (0)
66 73
67 /* We are entering a section that we would like to record profile information 74 /* We are entering a section that we would like to record profile information