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* New revised variable argument handling support

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* More dense bytecode encoding for varargs calls (like printf)
* Eliminated the extremely old bytecode format.  rev #0 is now 1.0


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9220 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-10-18 05:54:18 +00:00
parent 99e7ab72c8
commit cb7e2e2e0f
5 changed files with 290 additions and 149 deletions
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91
lib/Bytecode/Reader/ConstantReader.cpp
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@@ -258,64 +258,47 @@ Constant *BytecodeParser::parseConstantValue(const unsigned char *&Buf,
return ConstantStruct::get(ST, Elements);
}
case Type::PointerTyID: {
case Type::PointerTyID: { // ConstantPointerRef value...
const PointerType *PT = cast<PointerType>(Ty);
unsigned SubClass;
if (HasImplicitZeroInitializer)
SubClass = 1;
else
if (read_vbr(Buf, EndBuf, SubClass)) throw Error_readvbr;
switch (SubClass) {
case 0: // ConstantPointerNull value...
return ConstantPointerNull::get(PT);
case 1: { // ConstantPointerRef value...
unsigned Slot;
if (read_vbr(Buf, EndBuf, Slot)) throw Error_readvbr;
BCR_TRACE(4, "CPR: Type: '" << Ty << "' slot: " << Slot << "\n");
// Check to see if we have already read this global variable...
Value *Val = getValue(PT, Slot, false);
GlobalValue *GV;
if (Val) {
if (!(GV = dyn_cast<GlobalValue>(Val)))
throw std::string("Value of ConstantPointerRef not in ValueTable!");
BCR_TRACE(5, "Value Found in ValueTable!\n");
} else if (RevisionNum > 0) {
// Revision #0 could have forward references to globals that were weird.
// We got rid of this in subsequent revs.
throw std::string("Forward references to globals not allowed.");
} else { // Nope... find or create a forward ref. for it
GlobalRefsType::iterator I = GlobalRefs.find(std::make_pair(PT, Slot));
if (I != GlobalRefs.end()) {
BCR_TRACE(5, "Previous forward ref found!\n");
GV = cast<GlobalValue>(I->second);
} else {
BCR_TRACE(5, "Creating new forward ref to a global variable!\n");
// Create a placeholder for the global variable reference...
GlobalVariable *GVar =
new GlobalVariable(PT->getElementType(), false,
GlobalValue::InternalLinkage);
// Keep track of the fact that we have a forward ref to recycle it
GlobalRefs.insert(std::make_pair(std::make_pair(PT, Slot), GVar));
// Must temporarily push this value into the module table...
TheModule->getGlobalList().push_back(GVar);
GV = GVar;
}
unsigned Slot;
if (read_vbr(Buf, EndBuf, Slot)) throw Error_readvbr;
BCR_TRACE(4, "CPR: Type: '" << Ty << "' slot: " << Slot << "\n");
// Check to see if we have already read this global variable...
Value *Val = getValue(PT, Slot, false);
GlobalValue *GV;
if (Val) {
if (!(GV = dyn_cast<GlobalValue>(Val)))
throw std::string("Value of ConstantPointerRef not in ValueTable!");
BCR_TRACE(5, "Value Found in ValueTable!\n");
} else if (RevisionNum > 0) {
// Revision #0 could have forward references to globals that were weird.
// We got rid of this in subsequent revs.
throw std::string("Forward references to globals not allowed.");
} else { // Nope... find or create a forward ref. for it
GlobalRefsType::iterator I = GlobalRefs.find(std::make_pair(PT, Slot));
if (I != GlobalRefs.end()) {
BCR_TRACE(5, "Previous forward ref found!\n");
GV = cast<GlobalValue>(I->second);
} else {
BCR_TRACE(5, "Creating new forward ref to a global variable!\n");
// Create a placeholder for the global variable reference...
GlobalVariable *GVar =
new GlobalVariable(PT->getElementType(), false,
GlobalValue::InternalLinkage);
// Keep track of the fact that we have a forward ref to recycle it
GlobalRefs.insert(std::make_pair(std::make_pair(PT, Slot), GVar));
// Must temporarily push this value into the module table...
TheModule->getGlobalList().push_back(GVar);
GV = GVar;
}
return ConstantPointerRef::get(GV);
}
default:
BCR_TRACE(5, "UNKNOWN Pointer Constant Type!\n");
throw std::string("Unknown pointer constant type.");
}
return ConstantPointerRef::get(GV);
}
default: