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eliminate FnStubInfo, using MachineModuleInfoMachO instead. 

this makes function stub emission determinstic.

llvm-svn: 94033
This commit is contained in:
Chris Lattner 2010-01-20 21:36:48 +00:00
parent c5db599813
commit 32fb9564bc
1 changed files with 66 additions and 73 deletions
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139
llvm/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
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@ -58,43 +58,6 @@ STATISTIC(EmittedInsts, "Number of machine instrs printed");
namespace {
class PPCAsmPrinter : public AsmPrinter {
protected:
struct FnStubInfo {
MCSymbol *Stub, *LazyPtr, *AnonSymbol;
FnStubInfo() {
Stub = LazyPtr = AnonSymbol = 0;
}
void Init(const GlobalValue *GV, AsmPrinter *Printer) {
// Already initialized.
if (Stub != 0) return;
// Get the names.
Stub = Printer->GetSymbolWithGlobalValueBase(GV, "$stub");
LazyPtr = Printer->GetSymbolWithGlobalValueBase(GV, "$lazy_ptr");
AnonSymbol = Printer->GetSymbolWithGlobalValueBase(GV, "$stub$tmp");
}
void Init(StringRef GVName, Mangler *Mang, MCContext &Ctx) {
assert(!GVName.empty() && "external symbol name shouldn't be empty");
if (Stub != 0) return; // Already initialized.
// Get the names for the external symbol name.
SmallString<128> TmpStr;
Mang->getNameWithPrefix(TmpStr, GVName, Mangler::Private);
TmpStr += "$stub";
Stub = Ctx.GetOrCreateSymbol(TmpStr.str());
TmpStr.erase(TmpStr.end()-5, TmpStr.end()); // Remove $stub
TmpStr += "$lazy_ptr";
LazyPtr = Ctx.GetOrCreateSymbol(TmpStr.str());
TmpStr.erase(TmpStr.end()-9, TmpStr.end()); // Remove $lazy_ptr
TmpStr += "$stub$tmp";
AnonSymbol = Ctx.GetOrCreateSymbol(TmpStr.str());
}
};
DenseMap<const MCSymbol*, FnStubInfo> FnStubs;
DenseMap<const MCSymbol*, const MCSymbol*> TOC;
const PPCSubtarget &Subtarget;
uint64_t LabelID;
@ -236,17 +199,28 @@ namespace {
GlobalValue *GV = MO.getGlobal();
if (GV->isDeclaration() || GV->isWeakForLinker()) {
// Dynamically-resolved functions need a stub for the function.
FnStubInfo &FnInfo = FnStubs[GetGlobalValueSymbol(GV)];
FnInfo.Init(GV, this);
O << *FnInfo.Stub;
MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub");
const MCSymbol *&StubSym =
MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
if (StubSym == 0)
StubSym = GetGlobalValueSymbol(GV);
O << *Sym;
return;
}
}
if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
FnStubInfo &FnInfo =
FnStubs[GetExternalSymbolSymbol(MO.getSymbolName())];
FnInfo.Init(MO.getSymbolName(), Mang, OutContext);
O << *FnInfo.Stub;
SmallString<128> TempNameStr;
TempNameStr += StringRef(MO.getSymbolName());
TempNameStr += StringRef("$stub");
const MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str());
const MCSymbol *&StubSym =
MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
if (StubSym == 0) {
TempNameStr.erase(TempNameStr.end()-5, TempNameStr.end());
StubSym = OutContext.GetOrCreateSymbol(TempNameStr.str());
}
O << *Sym;
return;
}
}
@ -390,7 +364,7 @@ namespace {
bool doFinalization(Module &M);
void EmitStartOfAsmFile(Module &M);
void EmitFunctionStubs();
void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
@ -844,7 +818,22 @@ void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
}
void PPCDarwinAsmPrinter::EmitFunctionStubs() {
static const MCSymbol *GetLazyPtr(const MCSymbol *Sym, MCContext &Ctx) {
// Remove $stub suffix, add $lazy_ptr.
SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end()-5);
TmpStr += "$lazy_ptr";
return Ctx.GetOrCreateSymbol(TmpStr.str());
}
static const MCSymbol *GetAnonSym(const MCSymbol *Sym, MCContext &Ctx) {
// Add $tmp suffix to $stub, yielding $stub$tmp.
SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end());
TmpStr += "$tmp";
return Ctx.GetOrCreateSymbol(TmpStr.str());
}
void PPCDarwinAsmPrinter::
EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64;
TargetLoweringObjectFileMachO &TLOFMacho =
@ -860,29 +849,32 @@ void PPCDarwinAsmPrinter::EmitFunctionStubs() {
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
32, SectionKind::getText());
// FIXME: This is emitting in nondeterminstic order!
for (DenseMap<const MCSymbol*, FnStubInfo>::iterator I =
FnStubs.begin(), E = FnStubs.end(); I != E; ++I) {
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
OutStreamer.SwitchSection(StubSection);
EmitAlignment(4);
const FnStubInfo &Info = I->second;
O << *Info.Stub << ":\n";
O << "\t.indirect_symbol " << *I->first << '\n';
const MCSymbol *Stub = Stubs[i].first;
const MCSymbol *RawSym = Stubs[i].second;
const MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
const MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
O << *Stub << ":\n";
O << "\t.indirect_symbol " << *RawSym << '\n';
O << "\tmflr r0\n";
O << "\tbcl 20,31," << *Info.AnonSymbol << '\n';
O << *Info.AnonSymbol << ":\n";
O << "\tbcl 20,31," << *AnonSymbol << '\n';
O << *AnonSymbol << ":\n";
O << "\tmflr r11\n";
O << "\taddis r11,r11,ha16(" << *Info.LazyPtr << '-' << *Info.AnonSymbol
O << "\taddis r11,r11,ha16(" << *LazyPtr << '-' << *AnonSymbol
<< ")\n";
O << "\tmtlr r0\n";
O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(" << *Info.LazyPtr
<< '-' << *Info.AnonSymbol << ")(r11)\n";
O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(" << *LazyPtr
<< '-' << *AnonSymbol << ")(r11)\n";
O << "\tmtctr r12\n";
O << "\tbctr\n";
OutStreamer.SwitchSection(LSPSection);
O << *Info.LazyPtr << ":\n";
O << "\t.indirect_symbol " << *I->first << '\n';
O << *LazyPtr << ":\n";
O << "\t.indirect_symbol " << *RawSym << '\n';
O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
}
O << '\n';
@ -894,23 +886,23 @@ void PPCDarwinAsmPrinter::EmitFunctionStubs() {
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
16, SectionKind::getText());
// FIXME: This is emitting in nondeterminstic order!
for (DenseMap<const MCSymbol*, FnStubInfo>::iterator I = FnStubs.begin(),
E = FnStubs.end(); I != E; ++I) {
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
const MCSymbol *Stub = Stubs[i].first;
const MCSymbol *RawSym = Stubs[i].second;
const MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
OutStreamer.SwitchSection(StubSection);
EmitAlignment(4);
const FnStubInfo &Info = I->second;
O << *Info.Stub << ":\n";
O << "\t.indirect_symbol " << *I->first << '\n';
O << "\tlis r11,ha16(" << *Info.LazyPtr << ")\n";
O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(" << *Info.LazyPtr
O << *Stub << ":\n";
O << "\t.indirect_symbol " << *RawSym << '\n';
O << "\tlis r11,ha16(" << *LazyPtr << ")\n";
O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(" << *LazyPtr
<< ")(r11)\n";
O << "\tmtctr r12\n";
O << "\tbctr\n";
OutStreamer.SwitchSection(LSPSection);
O << *Info.LazyPtr << ":\n";
O << "\t.indirect_symbol " << *I->first << '\n';
O << *LazyPtr << ":\n";
O << "\t.indirect_symbol " << *RawSym << '\n';
O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
}
@ -927,8 +919,9 @@ bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
if (!FnStubs.empty())
EmitFunctionStubs();
MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
if (!Stubs.empty())
EmitFunctionStubs(Stubs);
if (MAI->doesSupportExceptionHandling() && MMI) {
// Add the (possibly multiple) personalities to the set of global values.
@ -946,7 +939,7 @@ bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
}
// Output stubs for dynamically-linked functions.
MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetGVStubList();
Stubs = MMIMacho.GetGVStubList();
// Output macho stubs for external and common global variables.
if (!Stubs.empty()) {