diff options
| -rw-r--r-- | tools/perf/util/llvm-utils.c | 42 | ||||
| -rw-r--r-- | tools/perf/util/llvm-utils.h | 5 |
2 files changed, 47 insertions, 0 deletions
diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c index 33071d6159bc..878a566763c3 100644 --- a/tools/perf/util/llvm-utils.c +++ b/tools/perf/util/llvm-utils.c @@ -42,6 +42,8 @@ int perf_llvm_config(const char *var, const char *value) llvm_param.kbuild_dir = strdup(value); else if (!strcmp(var, "kbuild-opts")) llvm_param.kbuild_opts = strdup(value); + else if (!strcmp(var, "dump-obj")) + llvm_param.dump_obj = !!perf_config_bool(var, value); else return -1; llvm_param.user_set_param = true; @@ -326,6 +328,42 @@ get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts) pr_debug("include option is set to %s\n", *kbuild_include_opts); } +static void +dump_obj(const char *path, void *obj_buf, size_t size) +{ + char *obj_path = strdup(path); + FILE *fp; + char *p; + + if (!obj_path) { + pr_warning("WARNING: No enough memory, skip object dumping\n"); + return; + } + + p = strrchr(obj_path, '.'); + if (!p || (strcmp(p, ".c") != 0)) { + pr_warning("WARNING: invalid llvm source path: '%s', skip object dumping\n", + obj_path); + goto out; + } + + p[1] = 'o'; + fp = fopen(obj_path, "wb"); + if (!fp) { + pr_warning("WARNING: failed to open '%s': %s, skip object dumping\n", + obj_path, strerror(errno)); + goto out; + } + + pr_info("LLVM: dumping %s\n", obj_path); + if (fwrite(obj_buf, size, 1, fp) != 1) + pr_warning("WARNING: failed to write to file '%s': %s, skip object dumping\n", + obj_path, strerror(errno)); + fclose(fp); +out: + free(obj_path); +} + int llvm__compile_bpf(const char *path, void **p_obj_buf, size_t *p_obj_buf_sz) { @@ -411,6 +449,10 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf, free(kbuild_dir); free(kbuild_include_opts); + + if (llvm_param.dump_obj) + dump_obj(path, obj_buf, obj_buf_sz); + if (!p_obj_buf) free(obj_buf); else diff --git a/tools/perf/util/llvm-utils.h b/tools/perf/util/llvm-utils.h index 23b9a743fe72..9f501cef06a1 100644 --- a/tools/perf/util/llvm-utils.h +++ b/tools/perf/util/llvm-utils.h @@ -30,6 +30,11 @@ struct llvm_param { */ const char *kbuild_opts; /* + * Default is false. If set to true, write compiling result + * to object file. + */ + bool dump_obj; + /* * Default is false. If one of the above fields is set by user * explicitly then user_set_llvm is set to true. This is used * for perf test. If user doesn't set anything in .perfconfig |