Re: [PATCH] sparse, llvm: Fix 'void *' pointer code generation

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On Mon, Oct 24, 2011 at 02:56:41PM +0300, Pekka Enberg wrote:
Fix the issue by switching to LLVMIntType(bits_per_pointer) in

On Mon, 24 Oct 2011, Jonathan Neuschäfer wrote:
You didn't update the commit message.

Thanks for pointing that out. Jeff, does this look OK?


From e6981551345b7284f6995556398b3564d02afc42 Mon Sep 17 00:00:00 2001
From: Pekka Enberg <penberg@xxxxxxxxxx>
Date: Mon, 24 Oct 2011 14:11:13 +0300
Subject: [PATCH] sparse, llvm: Fix 'void *' pointer code generation

Sparse front-end generates SYM_PTR with SYM_BASETYPE with bit_size set to -1
for "void *" pointers. We currently map that to LLVMVoidType() but that no
longer works with LLVM Subversion trunk:

  $ ./sparse-llvm validation/backend/struct.c
  sparse-llvm: Type.cpp:676: static llvm::PointerType* llvm::PointerType::get(llvm::Type*, unsigned int): Assertion `isValidElementType(EltTy) && "Invalid type for pointer element!"' failed.

Fix the issue by treating 'void *' as 'char *' as suggested by Linus:

On Mon, 24 Oct 2011, Linus Torvalds wrote:
Why bits_per_pointer? Isn't this the "base type" of void *? A more
logical choice would seem to be to make it equivalent to "char *", and
just make it fall through to the "case 8" case?

Cc: Christopher Li <sparse@xxxxxxxxxxx>
Cc: Jeff Garzik <jgarzik@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxx>
 sparse-llvm.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/sparse-llvm.c b/sparse-llvm.c
index a85dfea..fc0c2e9 100644
--- a/sparse-llvm.c
+++ b/sparse-llvm.c
@@ -79,9 +79,7 @@ static LLVMTypeRef sym_basetype_type(struct symbol *sym)
 	} else {
 		switch (sym->bit_size) {
-		case -1:
-			ret = LLVMVoidType();
-			break;
+		case -1:	/* 'void *' is treated like 'char *' */
 		case 8:
 			ret = LLVMInt8Type();

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