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src/hotspot/os/linux/decoder_linux.cpp
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@@ -21,13 +21,15 @@
* questions.
*
*/
#include "jvm.h"
+#include "logging/log.hpp"
+#include "memory/allocation.hpp"
+#include "memory/resourceArea.hpp"
#include "utilities/decoder_elf.hpp"
#include "utilities/elfFile.hpp"
-
#include <cxxabi.h>
bool ElfDecoder::demangle(const char* symbol, char *buf, int buflen) {
int status;
char* result;
@@ -84,5 +86,249 @@
}
}
fclose(file);
return result;
}
+
+class LinuxElfDebugInfo : public ElfDebugInfo {
+private:
+ ElfFile* _elf_file;
+
+public:
+ LinuxElfDebugInfo(const char* filepath);
+ ~LinuxElfDebugInfo() {
+ if (_elf_file != NULL) delete _elf_file;
+ }
+
+ static LinuxElfDebugInfo* by_debug_link(const char* filepath, const char* debug_info_name, unsigned int crc);
+ static LinuxElfDebugInfo* by_build_id(const char* filepath, unsigned char* build_id, size_t size);
+
+ bool decode(address addr, char* const buf, size_t buflen, int* offset) {
+ assert(_elf_file != NULL, "Debug info file not opened");
+ return _elf_file->decode(addr, buf, buflen, offset);
+ }
+
+ bool has_error() const {
+ return NullDecoder::is_error(_elf_file->get_status());
+ }
+};
+
+static const char* debug_link_section_name = ".gnu_debuglink";
+static const char* gnu_build_id_section_name = ".note.gnu.build-id";
+
+// Directory that contains global debuginfo files. In theory it
+// should be possible to change this, but in a Java environment there
+// is no obvious place to put a user interface to do it. Maybe this
+// could be set with an environment variable.
+static const char* debug_file_directory = "/usr/lib/debug";
+
+static unsigned int gnu_debuglink_crc32 (unsigned int crc,
+ unsigned char *buf, size_t len) {
+ static const unsigned int crc32_table[256] = {
+ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
+ 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
+ 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
+ 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+ 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
+ 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+ 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
+ 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+ 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
+ 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
+ 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
+ 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+ 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
+ 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
+ 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
+ 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+ 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
+ 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+ 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
+ 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+ 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
+ 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
+ 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
+ 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+ 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
+ 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
+ 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
+ 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+ 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
+ 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+ 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
+ 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+ 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
+ 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
+ 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
+ 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+ 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
+ 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
+ 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
+ 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+ 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
+ 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+ 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
+ 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+ 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
+ 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
+ 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
+ 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+ 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
+ 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
+ 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
+ 0x2d02ef8d
+ };
+
+ unsigned char *end;
+
+ crc = ~crc & 0xffffffff;
+ for (end = buf + len; buf < end; ++buf)
+ crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
+ return ~crc & 0xffffffff;
+}
+
+static bool verify_file_crc(const char* filepath, unsigned int crc) {
+ unsigned int file_crc = 0;
+ unsigned char buf[4 * K];
+
+ FILE* fd = fopen(filepath, "r");
+ if (fd == NULL) {
+ return false;
+ }
+
+ FileReader reader(fd);
+ int len;
+ unsigned char *end;
+
+ while (true) {
+ len = reader.read_buffer(buf, sizeof(buf));
+ if (len <= 0) break;
+ file_crc = gnu_debuglink_crc32(file_crc, buf, len);
+ }
+
+ fclose(fd);
+ return (crc == file_crc);
+}
+
+LinuxElfDebugInfo::LinuxElfDebugInfo(const char* filepath) {
+ _elf_file = new ElfFile(filepath, false /* load debug info */);
+}
+
+LinuxElfDebugInfo* LinuxElfDebugInfo::by_debug_link(const char* filepath, const char* debug_info_name, unsigned int crc) {
+ size_t size = strlen(filepath) + strlen(debug_info_name) + 2;
+
+ ResourceMark rm;
+ char* debuginfo_pathname = NEW_RESOURCE_ARRAY(char, size);
+ if (debuginfo_pathname == NULL) return NULL;
+
+ strcpy(debuginfo_pathname, filepath);
+ char *last_slash = strrchr(debuginfo_pathname, '/');
+ if (last_slash == NULL) {
+ return NULL;
+ }
+
+ /* Look in the same directory as the object. */
+ strcpy(last_slash + 1, debug_info_name);
+
+ if (!verify_file_crc(debuginfo_pathname, crc)) {
+ return NULL;
+ }
+
+ LinuxElfDebugInfo* debug_info = new LinuxElfDebugInfo(debuginfo_pathname);
+ if (debug_info->has_error()) {
+ delete debug_info;
+ return NULL;
+ }
+
+ log_debug(decoder)("Use %s for decoding symbols in %s", debuginfo_pathname, filepath);
+ return debug_info;
+}
+
+LinuxElfDebugInfo* LinuxElfDebugInfo::by_build_id(const char* filepath,
+ unsigned char* build_id, size_t size) {
+ size_t filename_size = strlen(debug_file_directory) + (sizeof "/.build-id/" - 1) + 1
+ + 2 * size + (sizeof ".debug" - 1) + 1;
+ ResourceMark rm;
+ char* filename = NEW_RESOURCE_ARRAY(char, size);
+ if (filename == NULL) return NULL;
+
+ char* s = filename + sprintf(filename, "%s/.build-id/", debug_file_directory);
+ if (size > 0) {
+ size --;
+ s += sprintf(s, "%02x", *build_id++);
+ }
+ if (size > 0) *s++ = '/';
+ while (size -- > 0) {
+ s += sprintf(s, "%02x", *build_id++);
+ }
+ strcpy (s, ".debug");
+
+ LinuxElfDebugInfo* debug_info = new LinuxElfDebugInfo(filename);
+ if (debug_info->has_error()) {
+ delete debug_info;
+ return NULL;
+ }
+
+ log_debug(decoder)("Use %s for decoding symbols in %s", filename, filepath);
+ return debug_info;
+}
+
+ElfDebugInfo* ElfFile::load_debuginfo() {
+ const char* file_path = filepath();
+ Elf_Shdr build_id_hdr;
+ ElfDebugInfo* debuginfo = NULL;
+
+ // try build id first
+ Elf_Nhdr* nhdr;
+ if (section_by_name(gnu_build_id_section_name, build_id_hdr) != -1) {
+ ElfSection build_id_section(_file, build_id_hdr);
+ nhdr = (Elf_Nhdr*)build_id_section.section_data();
+ if (nhdr != NULL) {
+ debuginfo = LinuxElfDebugInfo::by_build_id(file_path, (unsigned char*)(nhdr + 1) + nhdr->n_namesz,
+ nhdr->n_descsz);
+ } else {
+ Elf_Nhdr note_hdr;
+ MarkedFileReader mfd(fd());
+ if (mfd.has_mark() &&
+ mfd.set_position(build_id_section.section_header()->sh_offset) &&
+ mfd.read((void*)¬e_hdr, sizeof(note_hdr))) {
+ nhdr = ¬e_hdr;
+ debuginfo = LinuxElfDebugInfo::by_build_id(file_path, (unsigned char*)(nhdr + 1) + nhdr->n_namesz,
+ nhdr->n_descsz);
+ }
+ }
+ }
+ if (debuginfo != NULL) return debuginfo;
+
+ // try debug link
+ Elf_Shdr debug_link_hdr;
+ if (section_by_name(debug_link_section_name, debug_link_hdr) != -1) {
+ ElfSection debug_link_section(_file, debug_link_hdr);
+ char* debug_info_file = (char* const)debug_link_section.section_data();
+ unsigned int crc = 0;
+
+ if (debug_info_file != NULL) {
+ int offset = (strlen(debug_info_file) + 4) >> 2;
+ crc = ((unsigned int*)debug_link_section.section_data())[offset];
+ debuginfo = LinuxElfDebugInfo::by_debug_link(file_path, debug_info_file, crc);
+ } else {
+ size_t size = debug_link_section.section_header()->sh_size;
+ ResourceMark rm;
+ debug_info_file = NEW_RESOURCE_ARRAY(char, size);
+ if (debug_info_file != NULL) {
+ MarkedFileReader mfd(fd());
+ size_t sect_offset = debug_link_section.section_header()->sh_offset;
+ if (mfd.has_mark() &&
+ mfd.set_position(sect_offset) &&
+ mfd.read(debug_info_file, size)) {
+ int offset = ((strlen(debug_info_file) + 4) >> 2) * sizeof(unsigned int);
+ if (mfd.set_position(sect_offset + size_t(offset)) &&
+ mfd.read((void*)&crc, sizeof(crc))) {
+ debuginfo = LinuxElfDebugInfo::by_debug_link(file_path, debug_info_file, crc);
+ }
+ }
+ }
+ }
+ }
+
+ return debuginfo;
+}
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