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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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5
examples/HowToUseJIT/HowToUseJIT.cpp
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@ -51,7 +51,8 @@ int main() {
// Create the add1 function entry and insert this entry into module M. The
// function will have a return type of "int" and take an argument of "int".
// The '0' terminates the list of argument types.
Function *Add1F = M->getOrInsertFunction("add1", Type::IntTy, Type::IntTy, 0);
Function *Add1F = M->getOrInsertFunction("add1", Type::IntTy, Type::IntTy,
(Type *)0);
// Add a basic block to the function. As before, it automatically inserts
// because of the last argument.
@ -76,7 +77,7 @@ int main() {
// Now we going to create function `foo', which returns an int and takes no
// arguments.
Function *FooF = M->getOrInsertFunction("foo", Type::IntTy, 0);
Function *FooF = M->getOrInsertFunction("foo", Type::IntTy, (Type *)0);
// Add a basic block to the FooF function.
BB = new BasicBlock("EntryBlock", FooF);