On Tue, 01 May 2007 20:17:53 -0700 Josh Triplett wrote:
> Randy Dunlap wrote:
> > (using sparse 0.3)
> >
> > ./compiler-gcc.h:10:#define barrier() __asm__ __volatile__("": : :"memory")
> >
> > causes this output:
> >
> > net/sunrpc/xprtsock.c:640:2: error: Expected ( after asm
> > net/sunrpc/xprtsock.c:640:2: error: got __volatile__
> > net/sunrpc/xprtsock.c:640:2: error: typename in expression
> > net/sunrpc/xprtsock.c:640:2: error: Expected ) in function call
> > net/sunrpc/xprtsock.c:640:2: error: got :
> >
> >
> > Maybe sparse could allow modifiers between asm|__asm__ and the
> > (...) ?
>
> Sparse specifically allows volatile, and double-underscore variants, between
> the asm keyword and the open parenthesis:
>
> static struct token *parse_asm_statement(struct token *token, struct
> statement *stmt)
> {
> token = token->next;
> stmt->type = STMT_ASM;
> if (match_idents(token, &__volatile___ident, &__volatile_ident,
> &volatile_ident, NULL)) {
> token = token->next;
> }
> token = expect(token, '(', "after asm");
> [...]
>
>
> I cannot reproduce your report with the following test case (just added to git
> as validation/asm-volatile.c):
I'm doing this on i386 (x86_32). Maybe that would help you.
It's trivial to reproduce.
> #define barrier() __asm__ __volatile__("": : :"memory")
>
> static void f(void)
> {
> barrier();
> }
>
>
> Perhaps something else has caused the problem. Could you please generate a
> preprocessed file with "make net/sunrpc/xprtsock.i", and strip it down to a
> minimal test case that still generates the Sparse warning?
Sure, I'll trim the 35000 lines down to a test case and get back
to you.
---
~Randy
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