[PATCH 2/3] perf disasm: Define stubs for the LLVM and capstone disassemblers

[Arnaldo Carvalho de Melo <acme@kernel.org>]

From: Arnaldo Carvalho de Melo <acme@redhat.com>

This reduces the number of ifdefs in the main symbol__disassemble()
method and paves the way for allowing the user to configure the
disassemblers of preference.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Steinar H. Gunderson <sesse@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/disasm.c | 40 ++++++++++++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
index 36cf61602c17fe69..83df1da20a7b16cd 100644
--- a/tools/perf/util/disasm.c
+++ b/tools/perf/util/disasm.c
@@ -1422,6 +1422,13 @@ read_symbol(const char *filename, struct map *map, struct symbol *sym,
 	free(buf);
 	return NULL;
 }
+#else // defined(HAVE_LIBCAPSTONE_SUPPORT) || defined(HAVE_LIBLLVM_SUPPORT)
+static void symbol__disassembler_missing(const char *disassembler, const char *filename,
+					 struct symbol *sym)
+{
+	pr_debug("The %s disassembler isn't linked in for %s in %s\n",
+		 disassembler, sym->name, filename);
+}
 #endif
 
 #ifdef HAVE_LIBCAPSTONE_SUPPORT
@@ -1715,7 +1722,20 @@ static int symbol__disassemble_capstone(char *filename, struct symbol *sym,
 	count = -1;
 	goto out;
 }
-#endif
+#else // HAVE_LIBCAPSTONE_SUPPORT
+static int symbol__disassemble_capstone(char *filename, struct symbol *sym,
+					struct annotate_args *args)
+	symbol__disassembler_missing("capstone", filename, sym);
+	return -1;
+}
+
+static int symbol__disassemble_capstone_powerpc(char *filename, struct symbol *sym,
+						struct annotate_args *args __maybe_unused)
+{
+	symbol__disassembler_missing("capstone powerpc", filename, sym);
+	return -1;
+}
+#endif // HAVE_LIBCAPSTONE_SUPPORT
 
 static int symbol__disassemble_raw(char *filename, struct symbol *sym,
 					struct annotate_args *args)
@@ -1983,7 +2003,14 @@ static int symbol__disassemble_llvm(char *filename, struct symbol *sym,
 	free(line_storage);
 	return ret;
 }
-#endif
+#else // HAVE_LIBLLVM_SUPPORT
+static int symbol__disassemble_llvm(char *filename, struct symbol *sym,
+				    struct annotate_args *args __maybe_unused)
+{
+	symbol__disassembler_missing("LLVM", filename, sym);
+	return -1;
+}
+#endif // HAVE_LIBLLVM_SUPPORT
 
 /*
  * Possibly create a new version of line with tabs expanded. Returns the
@@ -2242,24 +2269,21 @@ int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
 			err = symbol__disassemble_raw(symfs_filename, sym, args);
 			if (err == 0)
 				goto out_remove_tmp;
-#ifdef HAVE_LIBCAPSTONE_SUPPORT
+
 			err = symbol__disassemble_capstone_powerpc(symfs_filename, sym, args);
 			if (err == 0)
 				goto out_remove_tmp;
-#endif
 		}
 	}
 
-#ifdef HAVE_LIBLLVM_SUPPORT
 	err = symbol__disassemble_llvm(symfs_filename, sym, args);
 	if (err == 0)
 		goto out_remove_tmp;
-#endif
-#ifdef HAVE_LIBCAPSTONE_SUPPORT
+
 	err = symbol__disassemble_capstone(symfs_filename, sym, args);
 	if (err == 0)
 		goto out_remove_tmp;
-#endif
+
 	err = symbol__disassemble_objdump(symfs_filename, sym, args);
 
 out_remove_tmp:
-- 
2.47.0