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Another hack due to allowing multiple symbols with the same name.

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llvm-svn: 26150
This commit is contained in:
Chris Lattner 2006-02-13 22:22:42 +00:00
parent b0362b8640
commit bdcb7e09c3
1 changed files with 52 additions and 11 deletions
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63
lib/Target/CBackend/Writer.cpp
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@ -47,10 +47,11 @@ namespace {
// Register the target.
RegisterTarget<CTargetMachine> X("c", " C backend");
/// NameAllUsedStructs - This pass inserts names for any unnamed structure
/// types that are used by the program.
/// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
/// any unnamed structure types that are used by the program, and merges
/// external functions with the same name.
///
class CBackendNameAllUsedStructs : public ModulePass {
class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<FindUsedTypes>();
}
@ -119,7 +120,6 @@ namespace {
private :
void lowerIntrinsics(Function &F);
bool nameAllUsedStructureTypes(Module &M);
void printModule(Module *M);
void printModuleTypes(const SymbolTable &ST);
void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
@ -224,7 +224,7 @@ namespace {
/// the program, and removes names from structure types that are not used by the
/// program.
///
bool CBackendNameAllUsedStructs::runOnModule(Module &M) {
bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
// Get a set of types that are used by the program...
std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
@ -256,6 +256,44 @@ bool CBackendNameAllUsedStructs::runOnModule(Module &M) {
++RenameCounter;
Changed = true;
}
// Loop over all external functions and globals. If we have two with
// identical names, merge them.
// FIXME: This code should disappear when we don't allow values with the same
// names when they have different types!
std::map<std::string, GlobalValue*> ExtSymbols;
for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
Function *GV = I++;
if (GV->isExternal() && GV->hasName()) {
std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
= ExtSymbols.insert(std::make_pair(GV->getName(), GV));
if (!X.second) {
// Found a conflict, replace this global with the previous one.
GlobalValue *OldGV = X.first->second;
GV->replaceAllUsesWith(ConstantExpr::getCast(OldGV, GV->getType()));
GV->eraseFromParent();
Changed = true;
}
}
}
// Do the same for globals.
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E;) {
GlobalVariable *GV = I++;
if (GV->isExternal() && GV->hasName()) {
std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
= ExtSymbols.insert(std::make_pair(GV->getName(), GV));
if (!X.second) {
// Found a conflict, replace this global with the previous one.
GlobalValue *OldGV = X.first->second;
GV->replaceAllUsesWith(ConstantExpr::getCast(OldGV, GV->getType()));
GV->eraseFromParent();
Changed = true;
}
}
}
return Changed;
}
@ -845,7 +883,8 @@ static void generateCompilerSpecificCode(std::ostream& Out) {
<< "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
<< "#define LLVM_INF __builtin_inf() /* Double */\n"
<< "#define LLVM_INFF __builtin_inff() /* Float */\n"
<< "#define LLVM_PREFETCH(addr,rw,locality) __builtin_prefetch(addr,rw,locality)\n"
<< "#define LLVM_PREFETCH(addr,rw,locality) "
"__builtin_prefetch(addr,rw,locality)\n"
<< "#else\n"
<< "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
<< "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
@ -905,7 +944,8 @@ bool CWriter::doInitialization(Module &M) {
// Global variable declarations...
if (!M.global_empty()) {
Out << "\n/* External Global Variable Declarations */\n";
for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) {
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (I->hasExternalLinkage()) {
Out << "extern ";
printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
@ -935,7 +975,8 @@ bool CWriter::doInitialization(Module &M) {
// Output the global variable declarations
if (!M.global_empty()) {
Out << "\n\n/* Global Variable Declarations */\n";
for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (!I->isExternal()) {
if (I->hasInternalLinkage())
Out << "static ";
@ -954,7 +995,8 @@ bool CWriter::doInitialization(Module &M) {
// Output the global variable definitions and contents...
if (!M.global_empty()) {
Out << "\n\n/* Global Variable Definitions and Initialization */\n";
for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (!I->isExternal()) {
if (I->hasInternalLinkage())
Out << "static ";
@ -1507,7 +1549,6 @@ void CWriter::visitCallInst(CallInst &I) {
case Intrinsic::vastart:
Out << "0; ";
// Out << "va_start(*(va_list*)&" << Mang->getValueName(&I) << ", ";
Out << "va_start(*(va_list*)";
writeOperand(I.getOperand(1));
Out << ", ";
@ -1772,7 +1813,7 @@ bool CTargetMachine::addPassesToEmitFile(PassManager &PM, std::ostream &o,
PM.add(createLowerAllocationsPass(true));
PM.add(createLowerInvokePass());
PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
PM.add(new CBackendNameAllUsedStructs());
PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
PM.add(new CWriter(o, getIntrinsicLowering()));
return false;
}