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Fix for problem when allocating something like this:

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malloc(100-i);

llvm-svn: 2409
This commit is contained in:
Chris Lattner 2002-04-29 20:09:21 +00:00
parent da0ca09961
commit 4968cc38aa
1 changed files with 3 additions and 7 deletions
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10
lib/Transforms/ExprTypeConvert.cpp
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@ -62,7 +62,7 @@ static bool MallocConvertableToType(MallocInst *MI, const Type *Ty,
analysis::ExprType Expr = analysis::ClassifyExpression(MI->getArraySize());
// Get information about the base datatype being allocated, before & after
unsigned ReqTypeSize = TD.getTypeSize(Ty);
int ReqTypeSize = TD.getTypeSize(Ty);
unsigned OldTypeSize = TD.getTypeSize(MI->getType()->getElementType());
// Must have a scale or offset to analyze it...
@ -71,15 +71,11 @@ static bool MallocConvertableToType(MallocInst *MI, const Type *Ty,
// Get the offset and scale of the allocation...
int OffsetVal = Expr.Offset ? getConstantValue(Expr.Offset) : 0;
int ScaleVal = Expr.Scale ? getConstantValue(Expr.Scale) : (Expr.Var ? 1 : 0);
if (ScaleVal < 0 || OffsetVal < 0) {
cerr << "malloc of a negative number???\n";
return false;
}
// The old type might not be of unit size, take old size into consideration
// here...
unsigned Offset = (unsigned)OffsetVal * OldTypeSize;
unsigned Scale = (unsigned)ScaleVal * OldTypeSize;
int Offset = OffsetVal * OldTypeSize;
int Scale = ScaleVal * OldTypeSize;
// In order to be successful, both the scale and the offset must be a multiple
// of the requested data type's size.