[llvm-commits] CVS: llvm/examples/Fibonacci/fibonacci.cpp

Jeff Cohen jeffc at jolt-lang.org
Sat Oct 22 21:37:40 PDT 2005

Changes in directory llvm/examples/Fibonacci:

fibonacci.cpp updated: 1.9 -> 1.10
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:  (+2 -1)

 fibonacci.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

Index: llvm/examples/Fibonacci/fibonacci.cpp
diff -u llvm/examples/Fibonacci/fibonacci.cpp:1.9 llvm/examples/Fibonacci/fibonacci.cpp:1.10
--- llvm/examples/Fibonacci/fibonacci.cpp:1.9	Fri May  6 01:22:00 2005
+++ llvm/examples/Fibonacci/fibonacci.cpp	Sat Oct 22 23:37:19 2005
@@ -37,7 +37,8 @@
 static Function *CreateFibFunction(Module *M) {
   // Create the fib function and insert it into module M.  This function is said
   // to return an int and take an int parameter.
-  Function *FibF = M->getOrInsertFunction("fib", Type::IntTy, Type::IntTy, 0);
+  Function *FibF = M->getOrInsertFunction("fib", Type::IntTy, Type::IntTy,
+                                          (Type *)0);
   // Add a basic block to the function.
   BasicBlock *BB = new BasicBlock("EntryBlock", FibF);

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