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GlobalOpt: Aliases don't have sections, don't copy them when replacing

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As defined in LangRef, aliases do not have sections.  However, LLVM's
GlobalAlias class inherits from GlobalValue, which means we can read and
set its section.  We should probably ban that as a separate change,
since it doesn't make much sense for an alias to have a section that
differs from its aliasee.

Fixes PR18757, where the section was being lost on the global in code
from Clang like:

extern "C" {
__attribute__((used, section("CUSTOM"))) static int in_custom_section;
}

Reviewers: rafael.espindola

Differential Revision: http://llvm-reviews.chandlerc.com/D2758

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201286 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2014-02-13 02:18:36 +00:00
parent 571417b8a3
commit 2798b77586
3 changed files with 11 additions and 5 deletions
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3
lib/Transforms/IPO/GlobalOpt.cpp
View File

@ -3018,7 +3018,8 @@ bool GlobalOpt::OptimizeGlobalAliases(Module &M) {
// Give the aliasee the name, linkage and other attributes of the alias.
Target->takeName(J);
Target->setLinkage(J->getLinkage());
Target->GlobalValue::copyAttributesFrom(J);
Target->setVisibility(J->getVisibility());
Target->setDLLStorageClass(J->getDLLStorageClass());
if (Used.usedErase(J))
Used.usedInsert(Target);

5
test/Transforms/GlobalOpt/alias-resolve.ll
View File

@ -1,7 +1,4 @@
; We use a temporary file so that the test fails when opt crashes.
; RUN: opt < %s -globalopt -S > %t
; RUN: FileCheck %s < %t
; RUN: opt < %s -globalopt -S | FileCheck %s
@foo1 = alias void ()* @foo2
; CHECK: @foo1 = alias void ()* @foo2

8
test/Transforms/GlobalOpt/alias-used-section.ll Normal file
View File

@ -0,0 +1,8 @@
; RUN: opt -S -globalopt < %s | FileCheck %s
@_Z17in_custom_section = internal global i8 42, section "CUSTOM"
@in_custom_section = protected dllexport alias internal i8* @_Z17in_custom_section
; CHECK: @in_custom_section = internal protected dllexport global i8 42, section "CUSTOM"
@llvm.used = appending global [1 x i8*] [i8* @in_custom_section], section "llvm.metadata"