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Add back the capability to include nul characters in strings with
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
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@ -76,8 +76,12 @@ namespace llvm {
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/// GetConstantStringInfo - This function computes the length of a
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/// null-terminated C string pointed to by V. If successful, it returns true
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/// and returns the string in Str. If unsuccessful, it returns false.
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bool GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset = 0);
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/// and returns the string in Str. If unsuccessful, it returns false. If
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/// StopAtNul is set to true (the default), the returned string is truncated
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/// by a nul character in the global. If StopAtNul is false, the nul
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/// character is included in the result string.
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bool GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset = 0,
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bool StopAtNul = true);
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} // end namespace llvm
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#endif
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@ -935,13 +935,14 @@ Value *llvm::FindInsertedValue(Value *V, const unsigned *idx_begin,
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/// GetConstantStringInfo - This function computes the length of a
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/// null-terminated C string pointed to by V. If successful, it returns true
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/// and returns the string in Str. If unsuccessful, it returns false.
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bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
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bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset,
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bool StopAtNul) {
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// If V is NULL then return false;
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if (V == NULL) return false;
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// Look through bitcast instructions.
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if (BitCastInst *BCI = dyn_cast<BitCastInst>(V))
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return GetConstantStringInfo(BCI->getOperand(0), Str, Offset);
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return GetConstantStringInfo(BCI->getOperand(0), Str, Offset, StopAtNul);
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// If the value is not a GEP instruction nor a constant expression with a
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// GEP instruction, then return false because ConstantArray can't occur
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@ -951,7 +952,7 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
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GEP = GEPI;
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} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
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if (CE->getOpcode() == Instruction::BitCast)
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return GetConstantStringInfo(CE->getOperand(0), Str, Offset);
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return GetConstantStringInfo(CE->getOperand(0), Str, Offset, StopAtNul);
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if (CE->getOpcode() != Instruction::GetElementPtr)
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return false;
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GEP = CE;
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@ -982,7 +983,8 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
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StartIdx = CI->getZExtValue();
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else
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return false;
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return GetConstantStringInfo(GEP->getOperand(0), Str, StartIdx+Offset);
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return GetConstantStringInfo(GEP->getOperand(0), Str, StartIdx+Offset,
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StopAtNul);
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}
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// The GEP instruction, constant or instruction, must reference a global
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@ -1020,7 +1022,7 @@ bool llvm::GetConstantStringInfo(Value *V, std::string &Str, uint64_t Offset) {
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ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
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if (!CI) // This array isn't suitable, non-int initializer.
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return false;
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if (CI->isZero())
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if (StopAtNul && CI->isZero())
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return true; // we found end of string, success!
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Str += (char)CI->getZExtValue();
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}
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@ -2594,7 +2594,7 @@ static bool isMemSrcFromString(SDOperand Src, std::string &Str,
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return false;
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GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
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if (GV && GetConstantStringInfo(GV, Str)) {
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if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false)) {
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SrcOff += SrcDelta;
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return true;
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}
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