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Change getConstantValue to throw an exception on error, not return null

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8988 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-10-09 20:41:16 +00:00
parent 1bc33a5227
commit c9456ca64c
2 changed files with 7 additions and 10 deletions
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12
lib/Bytecode/Reader/ConstantReader.cpp
View File

@ -165,9 +165,7 @@ Constant *BytecodeParser::parseConstantValue(const unsigned char *&Buf,
<< ArgValSlot << "\n");
// Get the arg value from its slot if it exists, otherwise a placeholder
Constant *C = getConstantValue(ArgTy, ArgValSlot);
if (C == 0) throw std::string("No arg value or placeholder found.");
ArgVec.push_back(C);
ArgVec.push_back(getConstantValue(ArgTy, ArgValSlot));
}
// Construct a ConstantExpr of the appropriate kind
@ -241,9 +239,7 @@ Constant *BytecodeParser::parseConstantValue(const unsigned char *&Buf,
while (NumElements--) { // Read all of the elements of the constant.
unsigned Slot;
if (read_vbr(Buf, EndBuf, Slot)) throw Error_readvbr;
Constant *C = getConstantValue(AT->getElementType(), Slot);
if (!C) throw std::string("Unable to get const value of array slot.");
Elements.push_back(C);
Elements.push_back(getConstantValue(AT->getElementType(), Slot));
}
return ConstantArray::get(AT, Elements);
}
@ -256,9 +252,7 @@ Constant *BytecodeParser::parseConstantValue(const unsigned char *&Buf,
for (unsigned i = 0; i < ET.size(); ++i) {
unsigned Slot;
if (read_vbr(Buf, EndBuf, Slot)) throw Error_readvbr;
Constant *C = getConstantValue(ET[i], Slot);
if (!C) throw std::string("Could not read const value in struct slot.");
Elements.push_back(C);
Elements.push_back(getConstantValue(ET[i], Slot));
}
return ConstantStruct::get(ST, Elements);

5
lib/Bytecode/Reader/Reader.cpp
View File

@ -164,7 +164,10 @@ BasicBlock *BytecodeParser::getBasicBlock(unsigned ID) {
///
Constant *BytecodeParser::getConstantValue(const Type *Ty, unsigned Slot) {
if (Value *V = getValue(Ty, Slot, false))
return dyn_cast<Constant>(V); // If we already have the value parsed...
if (Constant *C = dyn_cast<Constant>(V))
return C; // If we already have the value parsed, just return it
else
throw std::string("Reference of a value is expected to be a constant!");
std::pair<const Type*, unsigned> Key(Ty, Slot);
GlobalRefsType::iterator I = GlobalRefs.lower_bound(Key);