![Stephane Eranian](/assets/img/avatar_default.png)
This patch adds source line information support to perf for jitted code. The source line info must be emitted by the runtime, such as JVMTI. Perf injects extract the source line info from the jitdump file and adds the corresponding .debug_lines section in the ELF image generated for each jitted function. The source line enables matching any address in the profile with a source file and line number. The improvement is visible in perf annotate with the source code displayed alongside the assembly code. The dwarf code leverages the support from OProfile which is also released under GPLv2. Copyright 2007 OProfile authors. Signed-off-by: Stephane Eranian <eranian@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Carl Love <cel@us.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: John McCutchan <johnmccutchan@google.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sonny Rao <sonnyrao@chromium.org> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1448874143-7269-5-git-send-email-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
305 lines
7.7 KiB
C
305 lines
7.7 KiB
C
#include <sys/types.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <err.h>
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#include <jvmti.h>
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#include <jvmticmlr.h>
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#include <limits.h>
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#include "jvmti_agent.h"
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static int has_line_numbers;
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void *jvmti_agent;
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static jvmtiError
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do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci,
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jvmti_line_info_t *tab, jint *nr)
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{
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jint i, lines = 0;
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jint nr_lines = 0;
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jvmtiLineNumberEntry *loc_tab = NULL;
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jvmtiError ret;
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ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab);
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if (ret != JVMTI_ERROR_NONE)
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return ret;
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for (i = 0; i < nr_lines; i++) {
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if (loc_tab[i].start_location < bci) {
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tab[lines].pc = (unsigned long)pc;
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tab[lines].line_number = loc_tab[i].line_number;
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tab[lines].discrim = 0; /* not yet used */
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lines++;
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} else {
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break;
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}
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}
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(*jvmti)->Deallocate(jvmti, (unsigned char *)loc_tab);
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*nr = lines;
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return JVMTI_ERROR_NONE;
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}
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static jvmtiError
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get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t **tab, int *nr_lines)
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{
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const jvmtiCompiledMethodLoadRecordHeader *hdr;
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jvmtiCompiledMethodLoadInlineRecord *rec;
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jvmtiLineNumberEntry *lne = NULL;
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PCStackInfo *c;
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jint nr, ret;
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int nr_total = 0;
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int i, lines_total = 0;
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if (!(tab && nr_lines))
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return JVMTI_ERROR_NULL_POINTER;
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/*
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* Phase 1 -- get the number of lines necessary
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*/
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for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
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if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
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rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
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for (i = 0; i < rec->numpcs; i++) {
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c = rec->pcinfo + i;
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nr = 0;
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/*
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* unfortunately, need a tab to get the number of lines!
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*/
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ret = (*jvmti)->GetLineNumberTable(jvmti, c->methods[0], &nr, &lne);
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if (ret == JVMTI_ERROR_NONE) {
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/* free what was allocated for nothing */
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(*jvmti)->Deallocate(jvmti, (unsigned char *)lne);
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nr_total += (int)nr;
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}
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}
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}
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}
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if (nr_total == 0)
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return JVMTI_ERROR_NOT_FOUND;
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/*
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* Phase 2 -- allocate big enough line table
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*/
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*tab = malloc(nr_total * sizeof(**tab));
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if (!*tab)
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return JVMTI_ERROR_OUT_OF_MEMORY;
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for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
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if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
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rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
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for (i = 0; i < rec->numpcs; i++) {
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c = rec->pcinfo + i;
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nr = 0;
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ret = do_get_line_numbers(jvmti, c->pc,
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c->methods[0],
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c->bcis[0],
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*tab + lines_total,
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&nr);
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if (ret == JVMTI_ERROR_NONE)
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lines_total += nr;
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}
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}
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}
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*nr_lines = lines_total;
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return JVMTI_ERROR_NONE;
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}
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static void JNICALL
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compiled_method_load_cb(jvmtiEnv *jvmti,
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jmethodID method,
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jint code_size,
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void const *code_addr,
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jint map_length,
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jvmtiAddrLocationMap const *map,
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const void *compile_info)
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{
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jvmti_line_info_t *line_tab = NULL;
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jclass decl_class;
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char *class_sign = NULL;
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char *func_name = NULL;
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char *func_sign = NULL;
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char *file_name= NULL;
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char fn[PATH_MAX];
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uint64_t addr = (uint64_t)(uintptr_t)code_addr;
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jvmtiError ret;
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int nr_lines = 0; /* in line_tab[] */
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size_t len;
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ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method,
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&decl_class);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: cannot get declaring class");
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return;
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}
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if (has_line_numbers && map && map_length) {
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ret = get_line_numbers(jvmti, compile_info, &line_tab, &nr_lines);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: cannot get line table for method");
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nr_lines = 0;
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}
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}
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ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: cannot get source filename ret=%d", ret);
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goto error;
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}
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ret = (*jvmti)->GetClassSignature(jvmti, decl_class,
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&class_sign, NULL);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: getclassignature failed");
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goto error;
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}
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ret = (*jvmti)->GetMethodName(jvmti, method, &func_name,
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&func_sign, NULL);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: failed getmethodname");
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goto error;
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}
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/*
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* Assume path name is class hierarchy, this is a common practice with Java programs
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*/
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if (*class_sign == 'L') {
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int j, i = 0;
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char *p = strrchr(class_sign, '/');
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if (p) {
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/* drop the 'L' prefix and copy up to the final '/' */
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for (i = 0; i < (p - class_sign); i++)
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fn[i] = class_sign[i+1];
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}
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/*
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* append file name, we use loops and not string ops to avoid modifying
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* class_sign which is used later for the symbol name
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*/
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for (j = 0; i < (PATH_MAX - 1) && file_name && j < strlen(file_name); j++, i++)
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fn[i] = file_name[j];
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fn[i] = '\0';
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} else {
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/* fallback case */
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strcpy(fn, file_name);
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}
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/*
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* write source line info record if we have it
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*/
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if (jvmti_write_debug_info(jvmti_agent, addr, fn, line_tab, nr_lines))
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warnx("jvmti: write_debug_info() failed");
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len = strlen(func_name) + strlen(class_sign) + strlen(func_sign) + 2;
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{
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char str[len];
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snprintf(str, len, "%s%s%s", class_sign, func_name, func_sign);
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if (jvmti_write_code(jvmti_agent, str, addr, code_addr, code_size))
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warnx("jvmti: write_code() failed");
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}
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error:
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(*jvmti)->Deallocate(jvmti, (unsigned char *)func_name);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)func_sign);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
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free(line_tab);
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}
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static void JNICALL
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code_generated_cb(jvmtiEnv *jvmti,
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char const *name,
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void const *code_addr,
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jint code_size)
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{
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uint64_t addr = (uint64_t)(unsigned long)code_addr;
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int ret;
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ret = jvmti_write_code(jvmti_agent, name, addr, code_addr, code_size);
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if (ret)
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warnx("jvmti: write_code() failed for code_generated");
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}
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JNIEXPORT jint JNICALL
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Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __unused)
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{
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jvmtiEventCallbacks cb;
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jvmtiCapabilities caps1;
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jvmtiJlocationFormat format;
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jvmtiEnv *jvmti = NULL;
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jint ret;
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jvmti_agent = jvmti_open();
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if (!jvmti_agent) {
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warnx("jvmti: open_agent failed");
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return -1;
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}
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/*
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* Request a JVMTI interface version 1 environment
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*/
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ret = (*jvm)->GetEnv(jvm, (void *)&jvmti, JVMTI_VERSION_1);
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if (ret != JNI_OK) {
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warnx("jvmti: jvmti version 1 not supported");
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return -1;
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}
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/*
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* acquire method_load capability, we require it
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* request line numbers (optional)
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*/
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memset(&caps1, 0, sizeof(caps1));
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caps1.can_generate_compiled_method_load_events = 1;
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ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: acquire compiled_method capability failed");
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return -1;
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}
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ret = (*jvmti)->GetJLocationFormat(jvmti, &format);
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if (ret == JVMTI_ERROR_NONE && format == JVMTI_JLOCATION_JVMBCI) {
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memset(&caps1, 0, sizeof(caps1));
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caps1.can_get_line_numbers = 1;
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caps1.can_get_source_file_name = 1;
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ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
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if (ret == JVMTI_ERROR_NONE)
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has_line_numbers = 1;
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}
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memset(&cb, 0, sizeof(cb));
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cb.CompiledMethodLoad = compiled_method_load_cb;
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cb.DynamicCodeGenerated = code_generated_cb;
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ret = (*jvmti)->SetEventCallbacks(jvmti, &cb, sizeof(cb));
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: cannot set event callbacks");
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return -1;
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}
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ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
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JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: setnotification failed for method_load");
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return -1;
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}
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ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
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JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: setnotification failed on code_generated");
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return -1;
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}
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return 0;
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}
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JNIEXPORT void JNICALL
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Agent_OnUnload(JavaVM *jvm __unused)
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{
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int ret;
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ret = jvmti_close(jvmti_agent);
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if (ret)
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errx(1, "Error: op_close_agent()");
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}
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