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Implement support for a new LLVM 1.3 bytecode format, which uses uint's

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to index into structure types and allows arbitrary 32- and 64-bit integer
types to index into sequential types.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12651 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-04-05 01:27:26 +00:00
parent 68056127bb
commit 5fa428fda9
6 changed files with 191 additions and 87 deletions
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33
lib/Bytecode/Reader/InstructionReader.cpp
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@ -308,10 +308,35 @@ void BytecodeParser::ParseInstruction(const unsigned char *&Buf,
for (unsigned i = 1, e = Args.size(); i != e; ++i) {
const CompositeType *TopTy = dyn_cast_or_null<CompositeType>(NextTy);
if (!TopTy) throw std::string("Invalid getelementptr instruction!");
// FIXME: when PR82 is resolved.
unsigned IdxTy = isa<StructType>(TopTy) ? Type::UByteTyID :Type::LongTyID;
Idx.push_back(getValue(IdxTy, Args[i]));
unsigned ValIdx = Args[i];
unsigned IdxTy;
if (!hasRestrictedGEPTypes) {
// Struct indices are always uints, sequential type indices can be any
// of the 32 or 64-bit integer types. The actual choice of type is
// encoded in the low two bits of the slot number.
if (isa<StructType>(TopTy))
IdxTy = Type::UIntTyID;
else {
switch (ValIdx & 3) {
case 0: IdxTy = Type::UIntTyID; break;
case 1: IdxTy = Type::IntTyID; break;
case 2: IdxTy = Type::ULongTyID; break;
case 3: IdxTy = Type::LongTyID; break;
}
ValIdx >>= 2;
}
} else {
IdxTy = isa<StructType>(TopTy) ? Type::UByteTyID : Type::LongTyID;
}
Idx.push_back(getValue(IdxTy, ValIdx));
// Convert ubyte struct indices into uint struct indices.
if (isa<StructType>(TopTy) && hasRestrictedGEPTypes)
if (ConstantUInt *C = dyn_cast<ConstantUInt>(Idx.back()))
Idx[Idx.size()-1] = ConstantExpr::getCast(C, Type::UIntTy);
NextTy = GetElementPtrInst::getIndexedType(InstTy, Idx, true);
}