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recommit bcreader, handling packed structs correctly. Apparently

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people want fast *and* correct.  Sheesh.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55102 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-08-21 02:34:16 +00:00
parent 44925966ab
commit ea693dfab4
2 changed files with 133 additions and 13 deletions
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36
lib/Bitcode/Reader/BitcodeReader.h
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@ -32,9 +32,22 @@ namespace llvm {
class BitcodeReaderValueList : public User {
unsigned Capacity;
/// ResolveConstants - As we resolve forward-referenced constants, we add
/// information about them to this vector. This allows us to resolve them in
/// bulk instead of resolving each reference at a time. See the code in
/// ResolveConstantForwardRefs for more information about this.
///
/// The key of this vector is the placeholder constant, the value is the slot
/// number that holds the resolved value.
typedef std::vector<std::pair<Constant*, unsigned> > ResolveConstantsTy;
ResolveConstantsTy ResolveConstants;
public:
BitcodeReaderValueList() : User(Type::VoidTy, Value::ArgumentVal, 0, 0)
, Capacity(0) {}
~BitcodeReaderValueList() {
assert(ResolveConstants.empty() && "Constants not resolved?");
}
/// Provide fast operand accessors
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
@ -50,6 +63,7 @@ public:
}
void clear() {
assert(ResolveConstants.empty() && "Constants not resolved?");
if (OperandList) dropHungoffUses(OperandList);
Capacity = 0;
}
@ -73,15 +87,26 @@ public:
if (Idx == size()) {
push_back(V);
} else if (Value *OldV = getOperand(Idx)) {
// If there was a forward reference to this value, replace it.
setOperand(Idx, V);
OldV->replaceAllUsesWith(V);
delete OldV;
// Handle constants and non-constants (e.g. instrs) differently for
// efficiency.
if (Constant *PHC = dyn_cast<Constant>(OldV)) {
ResolveConstants.push_back(std::make_pair(PHC, Idx));
setOperand(Idx, V);
} else {
// If there was a forward reference to this value, replace it.
setOperand(Idx, V);
OldV->replaceAllUsesWith(V);
delete OldV;
}
} else {
initVal(Idx, V);
}
}
/// ResolveConstantForwardRefs - Once all constants are read, this method bulk
/// resolves any forward references.
void ResolveConstantForwardRefs();
private:
void initVal(unsigned Idx, Value *V) {
if (Idx >= size()) {
@ -94,7 +119,8 @@ private:
};
template <>
struct OperandTraits<BitcodeReaderValueList> : HungoffOperandTraits</*16 FIXME*/> {
struct OperandTraits<BitcodeReaderValueList>
: HungoffOperandTraits</*16 FIXME*/> {
};
DEFINE_TRANSPARENT_OPERAND_ACCESSORS(BitcodeReaderValueList, Value)