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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/Reader.cpp
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@@ -680,7 +680,8 @@ void BytecodeReader::ParseInstruction(std::vector<unsigned> &Oprnds,
break;
case 32: { //VANext_old
const Type* ArgTy = getValue(iType, Oprnds[0])->getType();
Function* NF = TheModule->getOrInsertFunction("llvm.va_copy", ArgTy, ArgTy, 0);
Function* NF = TheModule->getOrInsertFunction("llvm.va_copy", ArgTy, ArgTy,
(Type *)0);
//b = vanext a, t ->
//foo = alloca 1 of t
@@ -700,7 +701,8 @@ void BytecodeReader::ParseInstruction(std::vector<unsigned> &Oprnds,
}
case 33: { //VAArg_old
const Type* ArgTy = getValue(iType, Oprnds[0])->getType();
Function* NF = TheModule->getOrInsertFunction("llvm.va_copy", ArgTy, ArgTy, 0);
Function* NF = TheModule->getOrInsertFunction("llvm.va_copy", ArgTy, ArgTy,
(Type *)0);
//b = vaarg a, t ->
//foo = alloca 1 of t