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core changes for varargs

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22254 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth
2005-06-18 18:34:52 +00:00
parent f542821385
commit 558bc88a00
26 changed files with 501 additions and 280 deletions
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39
lib/Bytecode/Reader/Reader.cpp
View File

@@ -658,10 +658,43 @@ void BytecodeReader::ParseInstruction(std::vector<unsigned> &Oprnds,
Result = new VAArgInst(getValue(iType, Oprnds[0]),
getSanitizedType(Oprnds[1]));
break;
case Instruction::VANext:
Result = new VANextInst(getValue(iType, Oprnds[0]),
getSanitizedType(Oprnds[1]));
case 32: { //VANext_old
const Type* ArgTy = getValue(iType, Oprnds[0])->getType();
Function* NF = TheModule->getOrInsertFunction("llvm.va_copy", ArgTy, ArgTy, 0);
//b = vanext a, t ->
//foo = alloca 1 of t
//bar = vacopy a
//store bar -> foo
//tmp = vaarg foo, t
//b = load foo
AllocaInst* foo = new AllocaInst(ArgTy, 0, "vanext.fix");
BB->getInstList().push_back(foo);
CallInst* bar = new CallInst(NF, getValue(iType, Oprnds[0]));
BB->getInstList().push_back(bar);
BB->getInstList().push_back(new StoreInst(bar, foo));
Instruction* tmp = new VAArgInst(foo, getSanitizedType(Oprnds[1]));
BB->getInstList().push_back(tmp);
Result = new LoadInst(foo);
break;
}
case 33: { //VAArg_old
const Type* ArgTy = getValue(iType, Oprnds[0])->getType();
Function* NF = TheModule->getOrInsertFunction("llvm.va_copy", ArgTy, ArgTy, 0);
//b = vaarg a, t ->
//foo = alloca 1 of t
//bar = vacopy a
//store bar -> foo
//b = vaarg foo, t
AllocaInst* foo = new AllocaInst(ArgTy, 0, "vaarg.fix");
BB->getInstList().push_back(foo);
CallInst* bar = new CallInst(NF, getValue(iType, Oprnds[0]));
BB->getInstList().push_back(bar);
BB->getInstList().push_back(new StoreInst(bar, foo));
Result = new VAArgInst(foo, getSanitizedType(Oprnds[1]));
break;
}
case Instruction::Cast:
Result = new CastInst(getValue(iType, Oprnds[0]),
getSanitizedType(Oprnds[1]));

101
lib/Bytecode/Reader/ReaderWrappers.cpp
View File

@@ -148,6 +148,100 @@ BytecodeStdinReader::BytecodeStdinReader( BytecodeHandler* H )
ParseBytecode(FileBuf, FileData.size(), "<stdin>");
}
//===----------------------------------------------------------------------===//
// Varargs transmogrification code...
//
// CheckVarargs - This is used to automatically translate old-style varargs to
// new style varargs for backwards compatibility.
static ModuleProvider* CheckVarargs(ModuleProvider* MP) {
Module* M = MP->getModule();
// check to see if va_start takes arguements...
Function* F = M->getNamedFunction("llvm.va_start");
if(F == 0) return MP; //No varargs use, just return.
if (F->getFunctionType()->getNumParams() == 1)
return MP; // Modern varargs processing, just return.
// If we get to this point, we know that we have an old-style module.
// Materialize the whole thing to perform the rewriting.
MP->materializeModule();
if(Function* F = M->getNamedFunction("llvm.va_start")) {
assert(F->arg_size() == 0 && "Obsolete va_start takes 0 argument!");
//foo = va_start()
// ->
//bar = alloca typeof(foo)
//va_start(bar)
//foo = load bar
const Type* RetTy = Type::getPrimitiveType(Type::VoidTyID);
const Type* ArgTy = F->getFunctionType()->getReturnType();
const Type* ArgTyPtr = PointerType::get(ArgTy);
Function* NF = M->getOrInsertFunction("llvm.va_start",
RetTy, ArgTyPtr, 0);
for(Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E;)
if (CallInst* CI = dyn_cast<CallInst>(*I++)) {
AllocaInst* bar = new AllocaInst(ArgTy, 0, "vastart.fix.1", CI);
new CallInst(NF, bar, "", CI);
Value* foo = new LoadInst(bar, "vastart.fix.2", CI);
CI->replaceAllUsesWith(foo);
CI->getParent()->getInstList().erase(CI);
}
F->setName("");
}
if(Function* F = M->getNamedFunction("llvm.va_end")) {
assert(F->arg_size() == 1 && "Obsolete va_end takes 1 argument!");
//vaend foo
// ->
//bar = alloca 1 of typeof(foo)
//vaend bar
const Type* RetTy = Type::getPrimitiveType(Type::VoidTyID);
const Type* ArgTy = F->getFunctionType()->getParamType(0);
const Type* ArgTyPtr = PointerType::get(ArgTy);
Function* NF = M->getOrInsertFunction("llvm.va_end",
RetTy, ArgTyPtr, 0);
for(Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E;)
if (CallInst* CI = dyn_cast<CallInst>(*I++)) {
AllocaInst* bar = new AllocaInst(ArgTy, 0, "vaend.fix.1", CI);
new CallInst(NF, bar, "", CI);
CI->getParent()->getInstList().erase(CI);
}
F->setName("");
}
if(Function* F = M->getNamedFunction("llvm.va_copy")) {
assert(F->arg_size() == 1 && "Obsolete va_copy takes 1 argument!");
//foo = vacopy(bar)
// ->
//a = alloca 1 of typeof(foo)
//vacopy(a, bar)
//foo = load a
const Type* RetTy = Type::getPrimitiveType(Type::VoidTyID);
const Type* ArgTy = F->getFunctionType()->getReturnType();
const Type* ArgTyPtr = PointerType::get(ArgTy);
Function* NF = M->getOrInsertFunction("llvm.va_copy",
RetTy, ArgTyPtr, ArgTy, 0);
for(Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E;)
if (CallInst* CI = dyn_cast<CallInst>(*I++)) {
AllocaInst* a = new AllocaInst(ArgTy, 0, "vacopy.fix.1", CI);
new CallInst(NF, a, CI->getOperand(1), "", CI);
Value* foo = new LoadInst(a, "vacopy.fix.2", CI);
CI->replaceAllUsesWith(foo);
CI->getParent()->getInstList().erase(CI);
}
F->setName("");
}
return MP;
}
//===----------------------------------------------------------------------===//
// Wrapper functions
//===----------------------------------------------------------------------===//
@@ -159,7 +253,8 @@ llvm::getBytecodeBufferModuleProvider(const unsigned char *Buffer,
unsigned Length,
const std::string &ModuleID,
BytecodeHandler* H ) {
return new BytecodeBufferReader(Buffer, Length, ModuleID, H);
return CheckVarargs(
new BytecodeBufferReader(Buffer, Length, ModuleID, H));
}
/// ParseBytecodeBuffer - Parse a given bytecode buffer
@@ -182,9 +277,9 @@ Module *llvm::ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length,
ModuleProvider *llvm::getBytecodeModuleProvider(const std::string &Filename,
BytecodeHandler* H) {
if (Filename != std::string("-")) // Read from a file...
return new BytecodeFileReader(Filename,H);
return CheckVarargs(new BytecodeFileReader(Filename,H));
else // Read from stdin
return new BytecodeStdinReader(H);
return CheckVarargs(new BytecodeStdinReader(H));
}
/// ParseBytecodeFile - Parse the given bytecode file