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Now that we have everything nicely factored (e.g. asmprinter is not

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doing global variable classification anymore) and hookized, sink almost
all target targets global variable emission code into AsmPrinter and out
of each target.

Some notes:

1. PIC16 does completely custom and crazy stuff, so it is not changed.
2. XCore has some custom handling for extra directives.  I'll look at it next.
3. This switches linux/ppc to use .globl instead of .global.  If .globl is
   actually wrong, let me know and I'll fix it.
4. This makes linux/ppc get a lot of random cases right which were obviously
   wrong before, it is probably now a bit healthier.
5. Blackfin will probably start getting .comm and other things that it didn't
   before.  If this is undesirable, it should explicitly opt out of these
   things by clearing the relevant fields of MCAsmInfo.

This leads to a nice diffstat:
 14 files changed, 127 insertions(+), 830 deletions(-)




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93858 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-01-19 05:38:33 +00:00
parent 074f837bbb
commit 74bfe21b50
15 changed files with 128 additions and 831 deletions
Download Patch File Download Diff File Expand all files Collapse all files

124
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@@ -143,9 +143,129 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
// Check to see if this is a special global used by LLVM, if so, emit it.
if (EmitSpecialLLVMGlobal(GV))
return;
MCSymbol *GVSym = GetGlobalValueSymbol(GV);
printVisibility(GVSym, GV->getVisibility());
if (MAI->hasDotTypeDotSizeDirective()) {
O << "\t.type\t" << *GVSym;
if (MAI->getCommentString()[0] != '@')
O << ",@object\n";
else
O << ",%object\n";
}
// Let the target emit it.
PrintGlobalVariable(GV);
SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
const TargetData *TD = TM.getTargetData();
unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
// Handle normal common symbols.
if (GVKind.isCommon()) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
O << MAI->getCOMMDirective() << *GVSym << ',' << Size;
if (MAI->getCOMMDirectiveTakesAlignment())
O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << AlignLog) : AlignLog);
if (VerboseAsm) {
O << "\t\t" << MAI->getCommentString() << " '";
WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent());
O << '\'';
}
O << '\n';
return;
}
if (GVKind.isBSSLocal()) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
if (const char *LComm = MAI->getLCOMMDirective()) {
O << LComm << *GVSym << ',' << Size;
if (MAI->getLCOMMDirectiveTakesAlignment())
O << ',' << AlignLog;
} else {
O << "\t.local\t" << *GVSym << '\n';
O << MAI->getCOMMDirective() << *GVSym << ',' << Size;
if (MAI->getCOMMDirectiveTakesAlignment())
O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << AlignLog) : AlignLog);
}
if (VerboseAsm) {
O.PadToColumn(MAI->getCommentColumn());
O << MAI->getCommentString() << ' ';
WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent());
}
O << '\n';
return;
}
const MCSection *TheSection =
getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
// Handle the zerofill directive on darwin, which is a special form of BSS
// emission.
if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
// .zerofill __DATA, __common, _foo, 400, 5
OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
return;
}
OutStreamer.SwitchSection(TheSection);
// TODO: Factor into an 'emit linkage' thing that is shared with function
// bodies.
switch (GV->getLinkage()) {
case GlobalValue::CommonLinkage:
case GlobalValue::LinkOnceAnyLinkage:
case GlobalValue::LinkOnceODRLinkage:
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::LinkerPrivateLinkage:
if (const char *WeakDef = MAI->getWeakDefDirective()) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
// .weak_definition _foo
O << WeakDef << *GVSym << '\n';
} else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
// .linkonce same_size
O << LinkOnce;
} else
O << "\t.weak\t" << *GVSym << '\n';
break;
case GlobalValue::DLLExportLinkage:
case GlobalValue::AppendingLinkage:
// FIXME: appending linkage variables should go into a section of
// their name or something. For now, just emit them as external.
case GlobalValue::ExternalLinkage:
// If external or appending, declare as a global symbol.
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
break;
case GlobalValue::PrivateLinkage:
case GlobalValue::InternalLinkage:
break;
default:
llvm_unreachable("Unknown linkage type!");
}
EmitAlignment(AlignLog, GV);
O << *GVSym << ":";
if (VerboseAsm) {
O.PadToColumn(MAI->getCommentColumn());
O << MAI->getCommentString() << ' ';
WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent());
}
O << '\n';
EmitGlobalConstant(GV->getInitializer());
if (MAI->hasDotTypeDotSizeDirective())
O << "\t.size\t" << *GVSym << ", " << Size << '\n';
}