diff options
Diffstat (limited to 'libgcc/libgcov.c')
| -rw-r--r-- | libgcc/libgcov.c | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/libgcc/libgcov.c b/libgcc/libgcov.c index 93b8bd99963..d1a989274f4 100644 --- a/libgcc/libgcov.c +++ b/libgcc/libgcov.c @@ -1120,6 +1120,42 @@ __gcov_one_value_profiler (gcov_type *counters, gcov_type value) #endif #ifdef L_gcov_indirect_call_profiler +/* This function exist only for workaround of binutils bug 14342. + Once this compatibility hack is obsolette, it can be removed. */ + +/* By default, the C++ compiler will use function addresses in the + vtable entries. Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero + tells the compiler to use function descriptors instead. The value + of this macro says how many words wide the descriptor is (normally 2), + but it may be dependent on target flags. Since we do not have access + to the target flags here we just check to see if it is set and use + that to set VTABLE_USES_DESCRIPTORS to 0 or 1. + + It is assumed that the address of a function descriptor may be treated + as a pointer to a function. */ + +#ifdef TARGET_VTABLE_USES_DESCRIPTORS +#define VTABLE_USES_DESCRIPTORS 1 +#else +#define VTABLE_USES_DESCRIPTORS 0 +#endif + +/* Tries to determine the most common value among its inputs. */ +void +__gcov_indirect_call_profiler (gcov_type* counter, gcov_type value, + void* cur_func, void* callee_func) +{ + /* If the C++ virtual tables contain function descriptors then one + function may have multiple descriptors and we need to dereference + the descriptors to see if they point to the same function. */ + if (cur_func == callee_func + || (VTABLE_USES_DESCRIPTORS && callee_func + && *(void **) cur_func == *(void **) callee_func)) + __gcov_one_value_profiler_body (counter, value); +} + +#endif +#ifdef L_gcov_indirect_call_profiler_v2 /* These two variables are used to actually track caller and callee. Keep them in TLS memory so races are not common (they are written to often). @@ -1135,7 +1171,6 @@ __thread #endif gcov_type * __gcov_indirect_call_counters; - /* By default, the C++ compiler will use function addresses in the vtable entries. Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero tells the compiler to use function descriptors instead. The value @@ -1167,7 +1202,6 @@ __gcov_indirect_call_profiler_v2 (gcov_type value, void* cur_func) } #endif - #ifdef L_gcov_average_profiler /* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want to saturate up. */ |