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Add back the capability to include nul characters in strings with

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GetConstantStringInfo.  This will hopefully restore llvm-gcc to 
happy bootstrap land.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52851 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-06-28 05:33:32 +00:00
parent 3284d42c17
commit b746b82113
3 changed files with 14 additions and 8 deletions
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8
include/llvm/Analysis/ValueTracking.h
View File

@ -76,8 +76,12 @@ namespace llvm {
/// GetConstantStringInfo - This function computes the length of a
/// null-terminated C string pointed to by V. If successful, it returns true
/// and returns the string in Str. If unsuccessful, it returns false.
bool GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset = 0);
/// and returns the string in Str. If unsuccessful, it returns false. If
/// StopAtNul is set to true (the default), the returned string is truncated
/// by a nul character in the global. If StopAtNul is false, the nul
/// character is included in the result string.
bool GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset = 0,
bool StopAtNul = true);
} // end namespace llvm
#endif

12
lib/Analysis/ValueTracking.cpp
View File

@ -935,13 +935,14 @@ Value *llvm::FindInsertedValue(Value *V, const unsigned *idx_begin,
/// GetConstantStringInfo - This function computes the length of a
/// null-terminated C string pointed to by V. If successful, it returns true
/// and returns the string in Str. If unsuccessful, it returns false.
bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset,
bool StopAtNul) {
// If V is NULL then return false;
if (V == NULL) return false;
// Look through bitcast instructions.
if (BitCastInst *BCI = dyn_cast<BitCastInst>(V))
return GetConstantStringInfo(BCI->getOperand(0), Str, Offset);
return GetConstantStringInfo(BCI->getOperand(0), Str, Offset, StopAtNul);
// If the value is not a GEP instruction nor a constant expression with a
// GEP instruction, then return false because ConstantArray can't occur
@ -951,7 +952,7 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
GEP = GEPI;
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
if (CE->getOpcode() == Instruction::BitCast)
return GetConstantStringInfo(CE->getOperand(0), Str, Offset);
return GetConstantStringInfo(CE->getOperand(0), Str, Offset, StopAtNul);
if (CE->getOpcode() != Instruction::GetElementPtr)
return false;
GEP = CE;
@ -982,7 +983,8 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
StartIdx = CI->getZExtValue();
else
return false;
return GetConstantStringInfo(GEP->getOperand(0), Str, StartIdx+Offset);
return GetConstantStringInfo(GEP->getOperand(0), Str, StartIdx+Offset,
StopAtNul);
}
// The GEP instruction, constant or instruction, must reference a global
@ -1020,7 +1022,7 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
if (!CI) // This array isn't suitable, non-int initializer.
return false;
if (CI->isZero())
if (StopAtNul && CI->isZero())
return true; // we found end of string, success!
Str += (char)CI->getZExtValue();
}

2
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -2594,7 +2594,7 @@ static bool isMemSrcFromString(SDOperand Src, std::string &Str,
return false;
GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
if (GV && GetConstantStringInfo(GV, Str)) {
if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false)) {
SrcOff += SrcDelta;
return true;
}