> However, after using callgrind_annotate --auto=yes, there is no information
> for a particular function, say, "foo". The name of "foo" in the assembly is
> "_Z10foo". I checked and evidence show that this function, which is the core
> computational part, should be executed, so there should be some stats
> for it.
What does the symbol table entry for _Z10foo say?
--- foo.S
foo: .globl foo
movl $5,%eax
ret
bar: .globl bar
.type bar,@function
movl $7,%eax
ret
.size bar,.-bar
---
$ gcc -c foo.S
$ readelf --symbols foo.o # readelf is in the binutils package
Num: Value Size Type Bind Vis Ndx Name
4: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 1 foo
5: 0000000000000006 6 FUNC GLOBAL DEFAULT 1 bar
---
valgrind tools will ignore 'foo', but 'bar' will be measured.
Remember to insert ".type _Z10foo,@function" and ".size _Z10foo,.-_Z10foo"
into the source code.
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