diff options
Diffstat (limited to 'Documentation/libtraceevent-func_find.txt')
| -rw-r--r-- | Documentation/libtraceevent-func_find.txt | 51 |
1 files changed, 47 insertions, 4 deletions
diff --git a/Documentation/libtraceevent-func_find.txt b/Documentation/libtraceevent-func_find.txt index 20982e9..26fac68 100644 --- a/Documentation/libtraceevent-func_find.txt +++ b/Documentation/libtraceevent-func_find.txt @@ -3,7 +3,7 @@ libtraceevent(3) NAME ---- -tep_find_function,tep_find_function_address - Find function name / start address. +tep_find_function,tep_find_function_address,tep_find_function_info - Find function name / start address. SYNOPSIS -------- @@ -13,6 +13,8 @@ SYNOPSIS const char pass:[*]*tep_find_function*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_); unsigned long long *tep_find_function_address*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_); +int *tep_find_function_info*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_, const char pass:[**]_name_, + unsigned long long pass:[*]_start_, unsigned long pass:[*]_size_); -- DESCRIPTION @@ -28,6 +30,11 @@ The *tep_find_function_address()* function returns the function start address, by given address _addr_. The _addr_ does not have to be exact, it will select the function that would contain it. The _tep_ argument is the trace event parser context. +The *tep_find_function_info()* function retrieves the _name_, starting address (_start_), +and the function text _size_ of the function at _address_, if it is found. Note, +if the _tep_ handle has a function resolver (used by perf), then _size_ is set to +zero. + RETURN VALUE ------------ The *tep_find_function()* function returns the function name, or NULL in case @@ -36,6 +43,9 @@ it cannot be found. The *tep_find_function_address()* function returns the function start address, or 0 in case it cannot be found. +The *tep_find_function_info()* function returns 1 if a function is found for the +given address, or 0 if it is not. + EXAMPLE ------- [source,c] @@ -44,12 +54,45 @@ EXAMPLE ... struct tep_handle *tep = tep_alloc(); ... -void show_function( unsigned long long addr) +void show_function_name(unsigned long long addr) +{ + const char *fname = tep_find_function(tep, addr); + + if (fname) + printf("Found function %s at 0x%0llx\n", fname, addr); + else + printf("No function found at 0x%0llx\n", addr); +} + +void show_function_start_addr(unsigned long long addr) { const char *fname = tep_find_function(tep, addr); - unsigned long long fstart = tep_find_function_address(tep, addr); + unsigned long long fstart; + + if (!fname) { + printf("No function found at 0x%0llx\n", addr); + return; + } + + fstart = tep_find_function_address(tep, addr); + printf("Function %s at 0x%llx starts at 0x%0llx\n", + fname, addr, fstart); +} + +void show_function_info(unsigned long long addr) +{ + const char *fname; + unsigned long long fstart; + unsigned long size; + + ret = tep_find_function_info(tep, addr, &fname, &fstart, &size); + if (!ret) { + printf("No function found at 0x%0lx\n", addr); + return; + } - /* addr is in function named fname, starting at fstart address, at offset (addr - fstart) */ + printf("Function %s at 0x%lx starts at 0x%0lx and is %ld in size\n", + fname, addr, fstart, size); } ... -- |