[llvm-commits] CVS: llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp
Chris Lattner
lattner at cs.uiuc.edu
Fri May 20 15:22:36 PDT 2005
Changes in directory llvm/lib/Transforms/IPO:
SimplifyLibCalls.cpp updated: 1.37 -> 1.38
---
Log message:
Fix mismatched type problem that crashed on cases like this:
sprintf(P, "%s", X);
Where X is not an sbyte*. This fixes the bug JohnMC reported on llvm-bugs.
---
Diffs of the changes: (+17 -8)
SimplifyLibCalls.cpp | 25 +++++++++++++++++--------
1 files changed, 17 insertions(+), 8 deletions(-)
Index: llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp
diff -u llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp:1.37 llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp:1.38
--- llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp:1.37 Sun May 15 16:27:34 2005
+++ llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp Fri May 20 17:22:25 2005
@@ -542,7 +542,7 @@
return false;
}
- /// @brief Perform the strcpy optimization
+ /// @brief Perform the strchr optimizations
virtual bool OptimizeCall(CallInst* ci, SimplifyLibCalls& SLC)
{
// If there aren't three operands, bail
@@ -625,7 +625,7 @@
"Number of 'strcmp' calls simplified") {}
virtual ~StrCmpOptimization() {}
- /// @brief Make sure that the "strcpy" function has the right prototype
+ /// @brief Make sure that the "strcmp" function has the right prototype
virtual bool ValidateCalledFunction(const Function* f, SimplifyLibCalls& SLC)
{
if (f->getReturnType() == Type::IntTy && f->arg_size() == 2)
@@ -633,7 +633,7 @@
return false;
}
- /// @brief Perform the strcpy optimization
+ /// @brief Perform the strcmp optimization
virtual bool OptimizeCall(CallInst* ci, SimplifyLibCalls& SLC)
{
// First, check to see if src and destination are the same. If they are,
@@ -710,7 +710,7 @@
"Number of 'strncmp' calls simplified") {}
virtual ~StrNCmpOptimization() {}
- /// @brief Make sure that the "strcpy" function has the right prototype
+ /// @brief Make sure that the "strncmp" function has the right prototype
virtual bool ValidateCalledFunction(const Function* f, SimplifyLibCalls& SLC)
{
if (f->getReturnType() == Type::IntTy && f->arg_size() == 3)
@@ -1366,6 +1366,15 @@
}
} FPrintFOptimizer;
+/// CastToCStr - Return V if it is an sbyte*, otherwise cast it to sbyte*,
+/// inserting the cast before IP, and return the cast.
+static Value *CastToCStr(Value *V, Instruction &IP) {
+ const Type *SBPTy = PointerType::get(Type::SByteTy);
+ if (V->getType() != SBPTy)
+ return new CastInst(V, SBPTy, V->getName(), &IP);
+ return V;
+}
+
/// This LibCallOptimization will simplify calls to the "sprintf" library
/// function. It looks for cases where the result of sprintf is not used and the
@@ -1468,8 +1477,8 @@
if (!strcpy_func)
return false;
std::vector<Value*> args;
- args.push_back(ci->getOperand(1));
- args.push_back(ci->getOperand(3));
+ args.push_back(CastToCStr(ci->getOperand(1), *ci));
+ args.push_back(CastToCStr(ci->getOperand(3), *ci));
new CallInst(strcpy_func,args,"",ci);
}
else if (getConstantStringLength(ci->getOperand(3),len))
@@ -1480,8 +1489,8 @@
if (!memcpy_func)
return false;
std::vector<Value*> args;
- args.push_back(ci->getOperand(1));
- args.push_back(ci->getOperand(3));
+ args.push_back(CastToCStr(ci->getOperand(1), *ci));
+ args.push_back(CastToCStr(ci->getOperand(3), *ci));
args.push_back(ConstantUInt::get(Type::UIntTy,len));
args.push_back(ConstantUInt::get(Type::UIntTy,1));
new CallInst(memcpy_func,args,"",ci);
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