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tools include: add dis-asm-compat.h to handle version differences 

binutils changed the signature of init_disassemble_info(), which now causes
compilation failures for tools/{perf,bpf}, e.g. on debian unstable.

Relevant binutils commit:

  https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07

This commit introduces a wrapper for init_disassemble_info(), to avoid
spreading #ifdef DISASM_INIT_STYLED to a bunch of places. Subsequent
commits will use it to fix the build failures.

It likely is worth adding a wrapper for disassember(), to avoid the already
existing DISASM_FOUR_ARGS_SIGNATURE ifdefery.

Signed-off-by: Andres Freund <andres@anarazel.de>
Signed-off-by: Ben Hutchings <benh@debian.org>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Ben Hutchings <benh@debian.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: bpf@vger.kernel.org
Link: http://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@alap3.anarazel.de
Link: https://lore.kernel.org/r/20220801013834.156015-4-andres@anarazel.de
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andres Freund 2022-07-31 18:38:29 -07:00 committed by Arnaldo Carvalho de Melo
parent 516ddaadb4
commit a45b3d6926
1 changed files with 55 additions and 0 deletions
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55
tools/include/tools/dis-asm-compat.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
#ifndef _TOOLS_DIS_ASM_COMPAT_H
#define _TOOLS_DIS_ASM_COMPAT_H
#include <stdio.h>
#include <dis-asm.h>
/* define types for older binutils version, to centralize ifdef'ery a bit */
#ifndef DISASM_INIT_STYLED
enum disassembler_style {DISASSEMBLER_STYLE_NOT_EMPTY};
typedef int (*fprintf_styled_ftype) (void *, enum disassembler_style, const char*, ...);
#endif
/*
* Trivial fprintf wrapper to be used as the fprintf_styled_func argument to
* init_disassemble_info_compat() when normal fprintf suffices.
*/
static inline int fprintf_styled(void *out,
enum disassembler_style style,
const char *fmt, ...)
{
va_list args;
int r;
(void)style;
va_start(args, fmt);
r = vfprintf(out, fmt, args);
va_end(args);
return r;
}
/*
* Wrapper for init_disassemble_info() that hides version
* differences. Depending on binutils version and architecture either
* fprintf_func or fprintf_styled_func will be called.
*/
static inline void init_disassemble_info_compat(struct disassemble_info *info,
void *stream,
fprintf_ftype unstyled_func,
fprintf_styled_ftype styled_func)
{
#ifdef DISASM_INIT_STYLED
init_disassemble_info(info, stream,
unstyled_func,
styled_func);
#else
(void)styled_func;
init_disassemble_info(info, stream,
unstyled_func);
#endif
}
#endif /* _TOOLS_DIS_ASM_COMPAT_H */