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WinCOFF: Add support for -ffunction-sections

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This is a pretty straight forward translation for COFF, we just need to
stick the function in a COMDAT section marked as
IMAGE_COMDAT_SELECT_NODUPLICATES.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204565 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer 2014-03-23 17:47:39 +00:00
parent 2ca626570f
commit 77df5169a8
2 changed files with 17 additions and 4 deletions
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13
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -768,18 +768,23 @@ static const char *getCOFFSectionNameForUniqueGlobal(SectionKind Kind) {
const MCSection *TargetLoweringObjectFileCOFF::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler &Mang, const TargetMachine &TM) const {
// If we have -ffunction-sections then we should emit the global value to a
// uniqued section specifically for it.
// TODO: Implement -fdata-sections.
bool EmitUniquedSection = Kind.isText() && TM.getFunctionSections();
// If this global is linkonce/weak and the target handles this by emitting it
// into a 'uniqued' section name, create and return the section now.
if (GV->isWeakForLinker()) {
if (GV->isWeakForLinker() || EmitUniquedSection) {
const char *Name = getCOFFSectionNameForUniqueGlobal(Kind);
unsigned Characteristics = getCOFFSectionFlags(Kind);
Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
MCSymbol *Sym = TM.getSymbol(GV, Mang);
return getContext().getCOFFSection(Name, Characteristics,
Kind, Sym->getName(),
COFF::IMAGE_COMDAT_SELECT_ANY);
return getContext().getCOFFSection(
Name, Characteristics, Kind, Sym->getName(),
GV->isWeakForLinker() ? COFF::IMAGE_COMDAT_SELECT_ANY
: COFF::IMAGE_COMDAT_SELECT_NODUPLICATES);
}
if (Kind.isText())

8
test/CodeGen/X86/global-sections.ll
View File

@ -3,6 +3,7 @@
; RUN: llc < %s -mtriple=i386-apple-darwin10 -relocation-model=static | FileCheck %s -check-prefix=DARWIN-STATIC
; RUN: llc < %s -mtriple=x86_64-apple-darwin10 | FileCheck %s -check-prefix=DARWIN64
; RUN: llc < %s -mtriple=i386-unknown-linux-gnu -fdata-sections | FileCheck %s -check-prefix=LINUX-SECTIONS
; RUN: llc < %s -mtriple=i686-pc-win32 -ffunction-sections | FileCheck %s -check-prefix=WIN32-SECTIONS
; int G1;
@ -176,3 +177,10 @@
; LINUX-SECTIONS: .LG14:
; LINUX-SECTIONS: .asciz "foo"
; LINUX-SECTIONS: .size .LG14, 4
define void @G15() {
ret void
}
; WIN32-SECTIONS: .section .text,"xr",one_only,_G15
; WIN32-SECTIONS: .globl _G15