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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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2
tools/bugpoint/Miscompilation.cpp
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@ -666,7 +666,7 @@ static void CleanupAndPrepareModules(BugDriver &BD, Module *&Test,
Function *resolverFunc =
Safe->getOrInsertFunction("getPointerToNamedFunction",
PointerType::get(Type::SByteTy),
PointerType::get(Type::SByteTy), 0);
PointerType::get(Type::SByteTy), (Type *)0);
// Use the function we just added to get addresses of functions we need.
for (Module::iterator F = Safe->begin(), E = Safe->end(); F != E; ++F) {