llvm-project

Commit Graph

Author	SHA1	Message	Date
Rafael Espindola	a82555c0f8	Change how globalopt handles aliases in llvm.used. Instead of a custom implementation of replaceAllUsesWith, we just call replaceAllUsesWith and recreate llvm.used and llvm.compiler-used. This change is particularity interesting because it makes llvm see through what clang is doing with static used functions in extern "C" contexts. With this change, running clang -O2 in extern "C" { __attribute__((used)) static void foo() {} } produces @llvm.used = appending global [1 x i8] [i8 bitcast (void ()* @foo to i8*)], section "llvm.metadata" define internal void @foo() #0 { entry: ret void } llvm-svn: 183756	2013-06-11 17:48:06 +00:00
Rafael Espindola	007521673b	Don't replace an alias in llvm.used with its target. When we replace an internal alias with its target, be careful not to replace the entry in llvm.used (and llvm.compiler_used). llvm-svn: 181524	2013-05-09 17:22:59 +00:00

Author

SHA1

Message

Date

Rafael Espindola

a82555c0f8

Change how globalopt handles aliases in llvm.used.

Instead of a custom implementation of replaceAllUsesWith, we just call
replaceAllUsesWith and recreate llvm.used and llvm.compiler-used.

This change is particularity interesting because it makes llvm see
through what clang is doing with static used functions in extern "C"
contexts. With this change, running clang -O2 in

extern "C" {
  __attribute__((used)) static void foo() {}
}

produces

@llvm.used = appending global [1 x i8*] [i8* bitcast (void ()* @foo to
i8*)], section "llvm.metadata"
define internal void @foo() #0 {
entry:
  ret void
}

llvm-svn: 183756

2013-06-11 17:48:06 +00:00

Rafael Espindola

007521673b

Don't replace an alias in llvm.used with its target.

When we replace an internal alias with its target, be careful not to
replace the entry in llvm.used (and llvm.compiler_used).

llvm-svn: 181524

2013-05-09 17:22:59 +00:00

2 Commits