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When a function takes a variable number of pointer arguments, with a zero

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pointer marking the end of the list, the zero *must* be cast to the pointer
type.  An un-cast zero is a 32-bit int, and at least on x86_64, gcc will
not extend the zero to 64 bits, thus allowing the upper 32 bits to be
random junk.

The new END_WITH_NULL macro may be used to annotate a such a function
so that GCC (version 4 or newer) will detect the use of un-casted zero
at compile time.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23888 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jeff Cohen
2005-10-23 04:37:20 +00:00
parent 8b7f14e970
commit 66c5fd6c53
27 changed files with 290 additions and 262 deletions
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6
lib/Bytecode/Reader/ReaderWrappers.cpp
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@ -181,7 +181,7 @@ static ModuleProvider* CheckVarargs(ModuleProvider* MP) {
const Type* ArgTy = F->getFunctionType()->getReturnType();
const Type* ArgTyPtr = PointerType::get(ArgTy);
Function* NF = M->getOrInsertFunction("llvm.va_start",
RetTy, ArgTyPtr, 0);
RetTy, ArgTyPtr, (Type *)0);
for(Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E;)
if (CallInst* CI = dyn_cast<CallInst>(*I++)) {
@ -204,7 +204,7 @@ static ModuleProvider* CheckVarargs(ModuleProvider* MP) {
const Type* ArgTy = F->getFunctionType()->getParamType(0);
const Type* ArgTyPtr = PointerType::get(ArgTy);
Function* NF = M->getOrInsertFunction("llvm.va_end",
RetTy, ArgTyPtr, 0);
RetTy, ArgTyPtr, (Type *)0);
for(Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E;)
if (CallInst* CI = dyn_cast<CallInst>(*I++)) {
@ -230,7 +230,7 @@ static ModuleProvider* CheckVarargs(ModuleProvider* MP) {
const Type* ArgTy = F->getFunctionType()->getReturnType();
const Type* ArgTyPtr = PointerType::get(ArgTy);
Function* NF = M->getOrInsertFunction("llvm.va_copy",
RetTy, ArgTyPtr, ArgTyPtr, 0);
RetTy, ArgTyPtr, ArgTyPtr, (Type *)0);
for(Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E;)
if (CallInst* CI = dyn_cast<CallInst>(*I++)) {