[llvm-commits] CVS: llvm/examples/HowToUseJIT/HowToUseJIT.cpp

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

Changes in directory llvm/examples/HowToUseJIT:

HowToUseJIT.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:  (+3 -2)

 HowToUseJIT.cpp |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

Index: llvm/examples/HowToUseJIT/HowToUseJIT.cpp
diff -u llvm/examples/HowToUseJIT/HowToUseJIT.cpp:1.9 llvm/examples/HowToUseJIT/HowToUseJIT.cpp:1.10
--- llvm/examples/HowToUseJIT/HowToUseJIT.cpp:1.9	Fri May  6 00:59:51 2005
+++ llvm/examples/HowToUseJIT/HowToUseJIT.cpp	Sat Oct 22 23:37:19 2005
@@ -51,7 +51,8 @@
   // 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 @@
   // 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);

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