423 lines
11 KiB
C
423 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/compiler.h>
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#include <linux/string.h>
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#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 void print_error(jvmtiEnv *jvmti, const char *msg, jvmtiError ret)
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{
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char *err_msg = NULL;
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jvmtiError err;
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err = (*jvmti)->GetErrorName(jvmti, ret, &err_msg);
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if (err == JVMTI_ERROR_NONE) {
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warnx("%s failed with %s", msg, err_msg);
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(*jvmti)->Deallocate(jvmti, (unsigned char *)err_msg);
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} else {
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warnx("%s failed with an unknown error %d", msg, ret);
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}
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}
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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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print_error(jvmti, "GetLineNumberTable", ret);
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return ret;
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}
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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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tab[lines].methodID = m;
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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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} else {
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print_error(jvmti, "GetLineNumberTable", ret);
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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
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copy_class_filename(const char * class_sign, const char * file_name, char * result, size_t max_length)
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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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result[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 < (max_length - 1) && file_name && j < strlen(file_name); j++, i++)
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result[i] = file_name[j];
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result[i] = '\0';
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} else {
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/* fallback case */
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strlcpy(result, file_name, max_length);
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}
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}
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static jvmtiError
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get_source_filename(jvmtiEnv *jvmti, jmethodID methodID, char ** buffer)
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{
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jvmtiError ret;
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jclass decl_class;
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char *file_name = NULL;
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char *class_sign = NULL;
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char fn[PATH_MAX];
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size_t len;
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ret = (*jvmti)->GetMethodDeclaringClass(jvmti, methodID, &decl_class);
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if (ret != JVMTI_ERROR_NONE) {
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print_error(jvmti, "GetMethodDeclaringClass", ret);
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return ret;
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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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print_error(jvmti, "GetSourceFileName", ret);
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return ret;
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}
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ret = (*jvmti)->GetClassSignature(jvmti, decl_class, &class_sign, NULL);
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if (ret != JVMTI_ERROR_NONE) {
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print_error(jvmti, "GetClassSignature", ret);
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goto free_file_name_error;
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}
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copy_class_filename(class_sign, file_name, fn, PATH_MAX);
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len = strlen(fn);
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*buffer = malloc((len + 1) * sizeof(char));
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if (!*buffer) {
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print_error(jvmti, "GetClassSignature", ret);
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ret = JVMTI_ERROR_OUT_OF_MEMORY;
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goto free_class_sign_error;
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}
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strcpy(*buffer, fn);
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ret = JVMTI_ERROR_NONE;
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free_class_sign_error:
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(*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
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free_file_name_error:
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(*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
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return ret;
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}
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static jvmtiError
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fill_source_filenames(jvmtiEnv *jvmti, int nr_lines,
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const jvmti_line_info_t * line_tab,
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char ** file_names)
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{
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int index;
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jvmtiError ret;
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for (index = 0; index < nr_lines; ++index) {
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ret = get_source_filename(jvmti, line_tab[index].methodID, &(file_names[index]));
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if (ret != JVMTI_ERROR_NONE)
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return ret;
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}
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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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char ** line_file_names = 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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int output_debug_info = 0;
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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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print_error(jvmti, "GetMethodDeclaringClass", ret);
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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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} else if (nr_lines > 0) {
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line_file_names = malloc(sizeof(char*) * nr_lines);
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if (!line_file_names) {
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warnx("jvmti: cannot allocate space for line table method names");
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} else {
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memset(line_file_names, 0, sizeof(char*) * nr_lines);
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ret = fill_source_filenames(jvmti, nr_lines, line_tab, line_file_names);
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if (ret != JVMTI_ERROR_NONE) {
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warnx("jvmti: fill_source_filenames failed");
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} else {
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output_debug_info = 1;
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}
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}
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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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print_error(jvmti, "GetSourceFileName", 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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print_error(jvmti, "GetClassSignature", ret);
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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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print_error(jvmti, "GetMethodName", ret);
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goto error;
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}
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copy_class_filename(class_sign, file_name, fn, PATH_MAX);
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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 (output_debug_info)
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if (jvmti_write_debug_info(jvmti_agent, addr, nr_lines, line_tab, (const char * const *) line_file_names))
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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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while (line_file_names && (nr_lines > 0)) {
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if (line_file_names[nr_lines - 1]) {
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free(line_file_names[nr_lines - 1]);
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}
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nr_lines -= 1;
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}
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free(line_file_names);
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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 __maybe_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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}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* acquire method_load capability, we require it
|
||
|
|
* request line numbers (optional)
|
||
|
|
*/
|
||
|
|
memset(&caps1, 0, sizeof(caps1));
|
||
|
|
caps1.can_generate_compiled_method_load_events = 1;
|
||
|
|
|
||
|
|
ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
|
||
|
|
if (ret != JVMTI_ERROR_NONE) {
|
||
|
|
print_error(jvmti, "AddCapabilities", ret);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
ret = (*jvmti)->GetJLocationFormat(jvmti, &format);
|
||
|
|
if (ret == JVMTI_ERROR_NONE && format == JVMTI_JLOCATION_JVMBCI) {
|
||
|
|
memset(&caps1, 0, sizeof(caps1));
|
||
|
|
caps1.can_get_line_numbers = 1;
|
||
|
|
caps1.can_get_source_file_name = 1;
|
||
|
|
ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
|
||
|
|
if (ret == JVMTI_ERROR_NONE)
|
||
|
|
has_line_numbers = 1;
|
||
|
|
} else if (ret != JVMTI_ERROR_NONE)
|
||
|
|
print_error(jvmti, "GetJLocationFormat", ret);
|
||
|
|
|
||
|
|
|
||
|
|
memset(&cb, 0, sizeof(cb));
|
||
|
|
|
||
|
|
cb.CompiledMethodLoad = compiled_method_load_cb;
|
||
|
|
cb.DynamicCodeGenerated = code_generated_cb;
|
||
|
|
|
||
|
|
ret = (*jvmti)->SetEventCallbacks(jvmti, &cb, sizeof(cb));
|
||
|
|
if (ret != JVMTI_ERROR_NONE) {
|
||
|
|
print_error(jvmti, "SetEventCallbacks", ret);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
|
||
|
|
JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);
|
||
|
|
if (ret != JVMTI_ERROR_NONE) {
|
||
|
|
print_error(jvmti, "SetEventNotificationMode(METHOD_LOAD)", ret);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
|
||
|
|
JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL);
|
||
|
|
if (ret != JVMTI_ERROR_NONE) {
|
||
|
|
print_error(jvmti, "SetEventNotificationMode(CODE_GENERATED)", ret);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
JNIEXPORT void JNICALL
|
||
|
|
Agent_OnUnload(JavaVM *jvm __maybe_unused)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = jvmti_close(jvmti_agent);
|
||
|
|
if (ret)
|
||
|
|
errx(1, "Error: op_close_agent()");
|
||
|
|
}
|