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Revert "Convert linkonce* to weak* instead of strong."

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This reverts commit r195470.
Debugging failure in some bots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195472 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-11-22 17:09:34 +00:00
parent 0f778794c8
commit 4be5f33f65
2 changed files with 22 additions and 43 deletions
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54
lib/Transforms/IPO/ExtractGV.cpp
View File

@ -21,38 +21,6 @@
#include <algorithm>
using namespace llvm;
/// Make sure GV is visible from both modules. Delete is true if it is
/// being deleted from this module.
/// This also makes sure GV cannot be dropped so that references from
/// the split module remain valid.
static void makeVisible(GlobalValue &GV, bool Delete) {
bool Local = GV.hasLocalLinkage();
if (Local)
GV.setVisibility(GlobalValue::HiddenVisibility);
if (Local || Delete) {
GV.setLinkage(GlobalValue::ExternalLinkage);
return;
}
if (!GV.hasLinkOnceLinkage()) {
assert(!GV.isDiscardableIfUnused());
return;
}
// Map linkonce* to weak* so that llvm doesn't drop this GV.
switch(GV.getLinkage()) {
default:
llvm_unreachable("Unexpected linkage");
case GlobalValue::LinkOnceAnyLinkage:
GV.setLinkage(GlobalValue::WeakAnyLinkage);
return;
case GlobalValue::LinkOnceODRLinkage:
GV.setLinkage(GlobalValue::WeakODRLinkage);
return;
}
}
namespace {
/// @brief A pass to extract specific functions and their dependencies.
class GVExtractorPass : public ModulePass {
@ -92,7 +60,12 @@ namespace {
continue;
}
makeVisible(*I, Delete);
bool Local = I->isDiscardableIfUnused();
if (Local)
I->setVisibility(GlobalValue::HiddenVisibility);
if (Local || Delete)
I->setLinkage(GlobalValue::ExternalLinkage);
if (Delete)
I->setInitializer(0);
@ -107,7 +80,12 @@ namespace {
continue;
}
makeVisible(*I, Delete);
bool Local = I->isDiscardableIfUnused();
if (Local)
I->setVisibility(GlobalValue::HiddenVisibility);
if (Local || Delete)
I->setLinkage(GlobalValue::ExternalLinkage);
if (Delete)
I->deleteBody();
@ -119,10 +97,12 @@ namespace {
Module::alias_iterator CurI = I;
++I;
bool Delete = deleteStuff == (bool)Named.count(CurI);
makeVisible(*I, Delete);
if (CurI->isDiscardableIfUnused()) {
CurI->setVisibility(GlobalValue::HiddenVisibility);
CurI->setLinkage(GlobalValue::ExternalLinkage);
}
if (Delete) {
if (deleteStuff == (bool)Named.count(CurI)) {
Type *Ty = CurI->getType()->getElementType();
CurI->removeFromParent();

11
test/Other/extract-linkonce.ll
View File

@ -1,16 +1,15 @@
; RUN: llvm-extract -func foo -S < %s | FileCheck %s
; RUN: llvm-extract -delete -func foo -S < %s | FileCheck --check-prefix=DELETE %s
; Test that linkonce definitions are mapped to weak so that they are not
; dropped.
; Test that we don't convert weak_odr to external definitions.
; CHECK: @bar = external global i32
; CHECK: define weak i32* @foo() {
; CHECK: @bar = external hidden global i32
; CHECK: define hidden i32* @foo() {
; CHECK-NEXT: ret i32* @bar
; CHECK-NEXT: }
; DELETE: @bar = weak global i32 42
; DELETE: declare i32* @foo()
; DELETE: @bar = hidden global i32 42
; DELETE: declare hidden i32* @foo()
@bar = linkonce global i32 42