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There is no way to guarantee that constants are not forward referenced.

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Handle forward referenced constants in a general way.  This fixes bug:
Assembler/2002-10-13-ConstantEncodingProblem.llx and allows the SPEC
197.parser benchmark to be built


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4161 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2002-10-14 03:33:02 +00:00
parent 34048e2ace
commit bbd4b303e3
3 changed files with 37 additions and 29 deletions
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28
lib/Bytecode/Reader/Reader.cpp
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@@ -132,6 +132,34 @@ Value *BytecodeParser::getValue(const Type *Ty, unsigned oNum, bool Create) {
return d;
}
/// getConstantValue - Just like getValue, except that it returns a null pointer
/// only on error. It always returns a constant (meaning that if the value is
/// defined, but is not a constant, that is an error). If the specified
/// constant hasn't been parsed yet, a placeholder is defined and used. Later,
/// after the real value is parsed, the placeholder is eliminated.
///
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...
GlobalRefsType::iterator I = GlobalRefs.find(make_pair(Ty, Slot));
if (I != GlobalRefs.end()) {
BCR_TRACE(5, "Previous forward ref found!\n");
return cast<Constant>(I->second);
} else {
// Create a placeholder for the constant reference and
// keep track of the fact that we have a forward ref to recycle it
BCR_TRACE(5, "Creating new forward ref to a constant!\n");
Constant *C = new ConstPHolder(Ty, Slot);
// Keep track of the fact that we have a forward ref to recycle it
GlobalRefs.insert(make_pair(make_pair(Ty, Slot), C));
return C;
}
}
bool BytecodeParser::postResolveValues(ValueTable &ValTab) {
bool Error = false;
for (unsigned ty = 0; ty < ValTab.size(); ++ty) {