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-rw-r--r--tools/perf/util/llvm-utils.c53
1 files changed, 49 insertions, 4 deletions
diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
index 33071d6159bc..bf7216b8731d 100644
--- a/tools/perf/util/llvm-utils.c
+++ b/tools/perf/util/llvm-utils.c
@@ -3,11 +3,14 @@
* Copyright (C) 2015, Huawei Inc.
*/
+#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "debug.h"
#include "llvm-utils.h"
+#include "config.h"
+#include "util.h"
#define CLANG_BPF_CMD_DEFAULT_TEMPLATE \
"$CLANG_EXEC -D__KERNEL__ -D__NR_CPUS__=$NR_CPUS "\
@@ -42,6 +45,8 @@ 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;
@@ -103,7 +108,7 @@ read_from_pipe(const char *cmd, void **p_buf, size_t *p_read_sz)
file = popen(cmd, "r");
if (!file) {
pr_err("ERROR: unable to popen cmd: %s\n",
- strerror_r(errno, serr, sizeof(serr)));
+ str_error_r(errno, serr, sizeof(serr)));
return -EINVAL;
}
@@ -137,7 +142,7 @@ read_from_pipe(const char *cmd, void **p_buf, size_t *p_read_sz)
if (ferror(file)) {
pr_err("ERROR: error occurred when reading from pipe: %s\n",
- strerror_r(errno, serr, sizeof(serr)));
+ str_error_r(errno, serr, sizeof(serr)));
err = -EIO;
goto errout;
}
@@ -326,6 +331,42 @@ 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)
{
@@ -343,7 +384,7 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
if (path[0] != '-' && realpath(path, abspath) == NULL) {
err = errno;
pr_err("ERROR: problems with path %s: %s\n",
- path, strerror_r(err, serr, sizeof(serr)));
+ path, str_error_r(err, serr, sizeof(serr)));
return -err;
}
@@ -371,7 +412,7 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
if (nr_cpus_avail <= 0) {
pr_err(
"WARNING:\tunable to get available CPUs in this system: %s\n"
-" \tUse 128 instead.\n", strerror_r(errno, serr, sizeof(serr)));
+" \tUse 128 instead.\n", str_error_r(errno, serr, sizeof(serr)));
nr_cpus_avail = 128;
}
snprintf(nr_cpus_avail_str, sizeof(nr_cpus_avail_str), "%d",
@@ -411,6 +452,10 @@ 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
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