perf symbol: Add command line support for addr2line path

Allow addr2line to be set either on the command line or via the
perfconfig file. This doesn't currently work with llvm-addr2line as
the addr2line code emits two things:
1) the address to decode,
2) a bogus ',' value.
The expectation is the bogus value will generate:
??
??:0
that terminates the addr2line reading. However, the output from
llvm-addr2line is a single line with just the input ',' locking up the
addr2line reading that is expecting a second line.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Tom Rix <trix@redhat.com>
Cc: llvm@lists.linux.dev
Link: https://lore.kernel.org/r/20230328235543.1082207-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 5b31c4ee8d06..655987afef58 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -517,7 +517,7 @@ int cmd_annotate(int argc, const char **argv)
 	struct itrace_synth_opts itrace_synth_opts = {
 		.set = 0,
 	};
-	const char *disassembler_style = NULL, *objdump_path = NULL;
+	const char *disassembler_style = NULL, *objdump_path = NULL, *addr2line_path = NULL;
 	struct option options[] = {
 	OPT_STRING('i', "input", &input_name, "file",
 		    "input file name"),
@@ -570,6 +570,8 @@ int cmd_annotate(int argc, const char **argv)
 		    "Strip first N entries of source file path name in programs (with --prefix)"),
 	OPT_STRING(0, "objdump", &objdump_path, "path",
 		   "objdump binary to use for disassembly and annotations"),
+	OPT_STRING(0, "addr2line", &addr2line_path, "path",
+		   "addr2line binary to use for line numbers"),
 	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
 		    "Enable symbol demangling"),
 	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
@@ -629,6 +631,11 @@ int cmd_annotate(int argc, const char **argv)
 		if (!annotate.opts.objdump_path)
 			return -ENOMEM;
 	}
+	if (addr2line_path) {
+		symbol_conf.addr2line_path = strdup(addr2line_path);
+		if (!symbol_conf.addr2line_path)
+			return -ENOMEM;
+	}
 
 	if (annotate_check_args(&annotate.opts) < 0)
 		return -EINVAL;