Changes in directory llvm/include/llvm/Support:
CommandLine.h updated: 1.49 -> 1.50
DataTypes.h.in updated: 1.20 -> 1.21
---
Log message:
When a function takes a variable number of pointer arguments, with a zero
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.
---
Diffs of the changes: (+8 -1)
CommandLine.h | 3 ++-
DataTypes.h.in | 6 ++++++
2 files changed, 8 insertions(+), 1 deletion(-)
Index: llvm/include/llvm/Support/CommandLine.h
diff -u llvm/include/llvm/Support/CommandLine.h:1.49
llvm/include/llvm/Support/CommandLine.h:1.50
--- llvm/include/llvm/Support/CommandLine.h:1.49 Thu Oct 13 19:33:05 2005
+++ llvm/include/llvm/Support/CommandLine.h Sat Oct 22 23:37:19 2005
@@ -21,6 +21,7 @@
#define LLVM_SUPPORT_COMMANDLINE_H
#include "llvm/Support/type_traits.h"
+#include "llvm/Support/DataTypes.h"
#include <string>
#include <vector>
#include <utility>
@@ -335,7 +336,7 @@
template<class DataType>
ValuesClass<DataType> values(const char *Arg, DataType Val, const char *Desc,
- ...) {
+ ...) END_WITH_NULL {
va_list ValueArgs;
va_start(ValueArgs, Desc);
ValuesClass<DataType> Vals(Arg, Val, Desc, ValueArgs);
Index: llvm/include/llvm/Support/DataTypes.h.in
diff -u llvm/include/llvm/Support/DataTypes.h.in:1.20
llvm/include/llvm/Support/DataTypes.h.in:1.21
--- llvm/include/llvm/Support/DataTypes.h.in:1.20 Wed Jul 27 00:53:43 2005
+++ llvm/include/llvm/Support/DataTypes.h.in Sat Oct 22 23:37:19 2005
@@ -98,4 +98,10 @@
# define UINT64_MAX 0xffffffffffffffffULL
#endif
+#if __GNUC__ > 3
+#define END_WITH_NULL __attribute__((sentinel))
+#else
+#define END_WITH_NULL
+#endif
+
#endif /* SUPPORT_DATATYPES_H */
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