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Provide skeletone code for calculation of section, where global should be emitted into

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llvm-svn: 53295
This commit is contained in:
Anton Korobeynikov 2008-07-09 13:19:08 +00:00
parent 2b2f0a4b8f
commit 782a69505d
4 changed files with 99 additions and 5 deletions
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2
include/llvm/Target/TargetAsmInfo.h
View File

@ -474,7 +474,7 @@ namespace llvm {
/// SectionForGlobal - This hooks returns proper section name for given
/// global with all necessary flags and marks.
virtual const char* SectionForGlobal(const GlobalValue *GV) const;
virtual std::string SectionForGlobal(const GlobalValue *GV) const;
// Accessors.
//

2
lib/Target/TargetAsmInfo.cpp
View File

@ -255,7 +255,7 @@ TargetAsmInfo::SectionFlagsForGlobal(const GlobalValue *GV,
return flags;
}
const char*
std::string
TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
SectionKind::Kind kind = SectionKindForGlobal(GV);

97
lib/Target/X86/X86TargetAsmInfo.cpp
View File

@ -346,8 +346,8 @@ unsigned X86TargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
else {
// 64 bit targets encode pointers in 4 bytes iff:
// - code model is small OR
// - code model is medium and we're emitting externally visible symbols or
// any code symbols
// - code model is medium and we're emitting externally visible symbols
// or any code symbols
if (CM == CodeModel::Small ||
(CM == CodeModel::Medium && (Global ||
Reason != DwarfEncoding::Data)))
@ -375,3 +375,96 @@ unsigned X86TargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
}
}
std::string X86TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
const X86Subtarget *Subtarget = &X86TM->getSubtarget<X86Subtarget>();
SectionKind::Kind kind = SectionKindForGlobal(GV);
unsigned flags = SectionFlagsForGlobal(GV, GV->getSection().c_str());
std::string Name;
// FIXME: Should we use some hashing based on section name and just check
// flags?
// Select section name
if (const Function *F = dyn_cast<Function>(GV)) {
// Implement here
} else if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
if (GVar->hasSection()) {
// Honour section already set, if any
Name = GVar->getSection();
} else {
// Use default section depending on the 'type' of global
// FIXME: Handle linkonce stuff
switch (kind) {
case SectionKind::Data:
Name = DataSection;
break;
case SectionKind::BSS:
Name = (BSSSection ? BSSSection : DataSection);
break;
case SectionKind::ROData:
case SectionKind::RODataMergeStr:
case SectionKind::RODataMergeConst:
// FIXME: Temporary
Name = DataSection;
break;
case SectionKind::ThreadData:
Name = (TLSDataSection ? TLSDataSection : DataSection);
break;
case SectionKind::ThreadBSS:
Name = (TLSBSSSection ? TLSBSSSection : DataSection);
default:
assert(0 && "Unsuported section kind for global");
}
}
} else
assert(0 && "Unsupported global");
// Add all special flags, etc
switch (Subtarget->TargetType) {
case X86Subtarget::isELF:
Name += ",\"";
if (!(flags & SectionFlags::Debug))
Name += 'a';
if (flags & SectionFlags::Code)
Name += 'x';
if (flags & SectionFlags::Writeable)
Name += 'w';
if (flags & SectionFlags::Mergeable)
Name += 'M';
if (flags & SectionFlags::Strings)
Name += 'S';
if (flags & SectionFlags::TLS)
Name += 'T';
Name += "\"";
// FIXME: There can be exceptions here
if (flags & SectionFlags::BSS)
Name += ",@nobits";
else
Name += ",@progbits";
// FIXME: entity size for mergeable sections
break;
case X86Subtarget::isCygwin:
case X86Subtarget::isMingw:
Name += ",\"";
if (flags & SectionFlags::Code)
Name += 'x';
if (flags & SectionFlags::Writeable)
Name += 'w';
Name += "\"";
break;
case X86Subtarget::isDarwin:
// Darwin does not use any special flags
default:
break;
}
return Name;
}

3
lib/Target/X86/X86TargetAsmInfo.h
View File

@ -23,10 +23,11 @@ namespace llvm {
struct X86TargetAsmInfo : public TargetAsmInfo {
explicit X86TargetAsmInfo(const X86TargetMachine &TM);
virtual bool ExpandInlineAsm(CallInst *CI) const;
virtual unsigned PreferredEHDataFormat(DwarfEncoding::Target Reason,
bool Global) const;
virtual std::string SectionForGlobal(const GlobalValue *GV) const;
private:
const X86TargetMachine* X86TM;