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420 lines
11 KiB
420 lines
11 KiB
// 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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#ifdef HAVE_JVMTI_CMLR |
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#include <jvmticmlr.h> |
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#endif |
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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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#ifdef HAVE_JVMTI_CMLR |
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static jvmtiError |
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do_get_line_number(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci, |
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jvmti_line_info_t *tab) |
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{ |
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jint i, nr_lines = 0; |
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jvmtiLineNumberEntry *loc_tab = NULL; |
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jvmtiError ret; |
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jint src_line = -1; |
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ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab); |
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if (ret == JVMTI_ERROR_ABSENT_INFORMATION || ret == JVMTI_ERROR_NATIVE_METHOD) { |
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/* No debug information for this method */ |
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return ret; |
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} else 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 && loc_tab[i].start_location <= bci; i++) { |
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src_line = i; |
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} |
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if (src_line != -1) { |
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tab->pc = (unsigned long)pc; |
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tab->line_number = loc_tab[src_line].line_number; |
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tab->discrim = 0; /* not yet used */ |
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tab->methodID = m; |
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ret = JVMTI_ERROR_NONE; |
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} else { |
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ret = JVMTI_ERROR_ABSENT_INFORMATION; |
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} |
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(*jvmti)->Deallocate(jvmti, (unsigned char *)loc_tab); |
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return ret; |
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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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PCStackInfo *c; |
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jint 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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nr_total += rec->numpcs; |
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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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/* |
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* c->methods is the stack of inlined method calls |
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* at c->pc. [0] is the leaf method. Caller frames |
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* are ignored at the moment. |
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*/ |
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ret = do_get_line_number(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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if (ret == JVMTI_ERROR_NONE) |
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lines_total++; |
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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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#else /* HAVE_JVMTI_CMLR */ |
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static jvmtiError |
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get_line_numbers(jvmtiEnv *jvmti __maybe_unused, const void *compile_info __maybe_unused, |
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jvmti_line_info_t **tab __maybe_unused, int *nr_lines __maybe_unused) |
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{ |
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return JVMTI_ERROR_NONE; |
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} |
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#endif /* HAVE_JVMTI_CMLR */ |
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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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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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if (ret != JVMTI_ERROR_NOT_FOUND) { |
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warnx("jvmti: cannot get line table for method"); |
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} |
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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)->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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/* |
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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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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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} |
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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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print_error(jvmti, "AddCapabilities", ret); |
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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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} else if (ret != JVMTI_ERROR_NONE) |
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print_error(jvmti, "GetJLocationFormat", ret); |
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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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print_error(jvmti, "SetEventCallbacks", ret); |
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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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print_error(jvmti, "SetEventNotificationMode(METHOD_LOAD)", ret); |
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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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print_error(jvmti, "SetEventNotificationMode(CODE_GENERATED)", ret); |
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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 __maybe_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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