tmsriram marked an inline comment as done.
tmsriram added inline comments.
================
Comment at: clang/test/CodeGen/unique-internal-linkage-names.cpp:5
+// RUN: %clang_cc1 -triple x86_64 -x c++ -S -emit-llvm
-funique-internal-linkage-names -o - < %s | FileCheck %s --check-prefix=UNIQUE
+
+static int glob;
----------------
wmi wrote:
> MaskRay wrote:
> > Might be worth adding a few other internal linkage names.
> >
> > * an object in an unnamed namespace
> > * an extern "C" static function
> > * a function-local static variable
> > * `label: &&label`
> >
> > Hope @mtrofin and @davidxl can clarify what internal names may benefit AFDO
> > and we can add such internal names specifically.
> Only internal functions matter for AFDO. Other types of internal names are
> irrelevant.
extern "C" static is not very useful as the name is not exposed outside the
object file. C++ compiler will still mangle the name. for eg:
a.cpp
extern "C" {
static int bar() {
return 0;
}
}
int foo() {
printf("%p\n", bar);
}
$ nm a.o
0000000000000040 t _ZL3barv
Also, for label: &&label, it is not preserved in the symbol table as a .L<name>
is used which is deleted by the assembler. I can throw a asm("") directive but
that will bypass the front-end. Is there anyway to preserve this?
I can add the rest of the cases.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D73307/new/
https://reviews.llvm.org/D73307
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