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introduce a section kind for common linkage. Use this to slightly

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simplify and commonize some of the asmprinter logic for globals.

This also avoids printing the MCSection for .zerofill, which broke
the llvm-gcc build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93843 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-19 02:48:26 +00:00
parent 129e1872c2
commit a3839bc371
6 changed files with 107 additions and 25 deletions
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9
include/llvm/MC/SectionKind.h
View File

@ -87,6 +87,11 @@ class SectionKind {
/// BSS - Zero initialized writeable data.
BSS,
/// Common - Data with common linkage. These represent tentative
/// definitions, which always have a zero initializer and are never
/// marked 'constant'.
Common,
/// DataRel - This is the most general form of data that is written
/// to by the program, it can have random relocations to arbitrary
@ -158,10 +163,11 @@ public:
bool isThreadData() const { return K == ThreadData; }
bool isGlobalWriteableData() const {
return isBSS() || isDataRel() || isReadOnlyWithRel();
return isBSS() || isCommon() || isDataRel() || isReadOnlyWithRel();
}
bool isBSS() const { return K == BSS; }
bool isCommon() const { return K == Common; }
bool isDataRel() const {
return K == DataRel || K == DataRelLocal || K == DataNoRel;
@ -207,6 +213,7 @@ public:
static SectionKind getThreadBSS() { return get(ThreadBSS); }
static SectionKind getThreadData() { return get(ThreadData); }
static SectionKind getBSS() { return get(BSS); }
static SectionKind getCommon() { return get(Common); }
static SectionKind getDataRel() { return get(DataRel); }
static SectionKind getDataRelLocal() { return get(DataRelLocal); }
static SectionKind getDataNoRel() { return get(DataNoRel); }

23
lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
View File

@ -1197,10 +1197,27 @@ void ARMAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
O << "\t.type " << *GVarSym << ",%object\n";
SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
// Handle normal common symbols.
if (GVKind.isCommon()) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
O << ".comm " << *GVarSym << ',' << Size;
if (MAI->getCOMMDirectiveTakesAlignment())
O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
if (VerboseAsm) {
O << "\t\t" << MAI->getCommentString() << " '";
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
O << '\'';
}
O << '\n';
return;
}
const MCSection *TheSection =
getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
OutStreamer.SwitchSection(TheSection);
// Handle the zerofill directive on darwin, which is a special form of BSS
// emission.
if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective()) {
@ -1215,6 +1232,8 @@ void ARMAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
}
}
OutStreamer.SwitchSection(TheSection);
// FIXME: get this stuff from section kind flags.
if (C->isNullValue() && !GVar->hasSection() && !GVar->isThreadLocal() &&
// Don't put things that should go in the cstring section into "comm".

67
lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
View File

@ -714,8 +714,27 @@ void PPCLinuxAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
unsigned Size = TD->getTypeAllocSize(Type);
unsigned Align = TD->getPreferredAlignmentLog(GVar);
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
TM));
SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
// Handle normal common symbols.
if (GVKind.isCommon()) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
O << ".comm " << *GVarSym << ',' << Size;
if (MAI->getCOMMDirectiveTakesAlignment())
O << ',' << Align;
if (VerboseAsm) {
O << "\t\t" << MAI->getCommentString() << " '";
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
O << '\'';
}
O << '\n';
return;
}
OutStreamer.SwitchSection(getObjFileLowering().
SectionForGlobal(GVar, GVKind, Mang, TM));
if (C->isNullValue() && /* FIXME: Verify correct */
!GVar->hasSection() &&
@ -945,10 +964,27 @@ void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
unsigned Align = TD->getPreferredAlignmentLog(GVar);
SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
// Handle normal common symbols.
if (GVKind.isCommon()) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
O << ".comm " << *GVarSym << ',' << Size;
if (MAI->getCOMMDirectiveTakesAlignment())
O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
if (VerboseAsm) {
O << "\t\t" << MAI->getCommentString() << " '";
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
O << '\'';
}
O << '\n';
return;
}
const MCSection *TheSection =
getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
OutStreamer.SwitchSection(TheSection);
// Handle the zerofill directive on darwin, which is a special form of BSS
// emission.
if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective()) {
@ -963,6 +999,8 @@ void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
}
}
OutStreamer.SwitchSection(TheSection);
/// FIXME: Drive this off the section!
if (C->isNullValue() && /* FIXME: Verify correct */
!GVar->hasSection() &&
@ -974,7 +1012,14 @@ void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
if (GVar->hasLocalLinkage()) {
O << MAI->getLCOMMDirective() << *GVarSym << ',' << Size << ',' << Align;
} else if (!GVar->hasCommonLinkage()) {
if (VerboseAsm) {
O << "\t\t" << MAI->getCommentString() << " '";
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
O << "'";
}
O << '\n';
} else {
O << "\t.globl " << *GVarSym << '\n' << MAI->getWeakDefDirective();
O << *GVarSym << '\n';
EmitAlignment(Align, GVar);
@ -985,19 +1030,7 @@ void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
}
O << '\n';
EmitGlobalConstant(C);
return;
} else {
O << ".comm " << *GVarSym << ',' << Size;
// Darwin 9 and above support aligned common data.
if (Subtarget.isDarwin9())
O << ',' << Align;
}
if (VerboseAsm) {
O << "\t\t" << MAI->getCommentString() << " '";
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
O << "'";
}
O << '\n';
return;
}

2
lib/Target/SystemZ/AsmPrinter/SystemZAsmPrinter.cpp
View File

@ -318,7 +318,7 @@ void SystemZAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
if (C->isNullValue() && !GVar->hasSection() &&
!GVar->isThreadLocal() &&
(GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
(GVar->hasLocalLinkage() || GVar->hasCommonLinkage())) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.

8
lib/Target/TargetLoweringObjectFile.cpp
View File

@ -141,6 +141,10 @@ SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
return SectionKind::getThreadData();
}
// Variables with common linkage always get classified as common.
if (GVar->hasCommonLinkage())
return SectionKind::getCommon();
// Variable can be easily put to BSS section.
if (isSuitableForBSS(GVar))
return SectionKind::getBSS();
@ -577,7 +581,7 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
// 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() && !Kind.isCommon()) {
const char *Prefix = getSectionPrefixForUniqueGlobal(Kind);
SmallString<128> Name;
Name.append(Prefix, Prefix+strlen(Prefix));
@ -630,7 +634,7 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
if (Kind.isThreadData()) return TLSDataSection;
if (Kind.isThreadBSS()) return TLSBSSSection;
if (Kind.isBSS()) return BSSSection;
if (Kind.isBSS() || Kind.isCommon()) return BSSSection;
if (Kind.isDataNoRel()) return DataSection;
if (Kind.isDataRelLocal()) return DataRelLocalSection;

23
lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
View File

@ -676,9 +676,26 @@ void X86AsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
O << "\t.type\t" << *GVarSym << ",@object\n";
SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
// Handle normal common symbols.
if (GVKind.isCommon()) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
O << ".comm " << *GVarSym << ',' << Size;
if (MAI->getCOMMDirectiveTakesAlignment())
O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
if (VerboseAsm) {
O << "\t\t" << MAI->getCommentString() << " '";
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
O << '\'';
}
O << '\n';
return;
}
const MCSection *TheSection =
getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
OutStreamer.SwitchSection(TheSection);
// Handle the zerofill directive on darwin, which is a special form of BSS
// emission.
@ -693,6 +710,8 @@ void X86AsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
return;
}
}
OutStreamer.SwitchSection(TheSection);
// FIXME: get this stuff from section kind flags.
if (C->isNullValue() && !GVar->hasSection() &&
@ -707,7 +726,7 @@ void X86AsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
O << LComm << *GVarSym << ',' << Size;
if (Subtarget->isTargetDarwin())
O << ',' << Align;
} else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
} else if (Subtarget->isTargetDarwin()) {
OutStreamer.EmitSymbolAttribute(GVarSym, MCStreamer::Global);
O << MAI->getWeakDefDirective() << *GVarSym << '\n';
EmitAlignment(Align, GVar);