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addr2line.c: Support "Line Number Program Header" in DWARF 5

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This commit is contained in:
Yusuke Endoh 2022-12-21 22:18:48 +09:00
parent 2445a4c5b7
commit c827d724b7
Notes: git 2022-12-22 09:57:25 +00:00 
Merged: https://github.com/ruby/ruby/pull/6980
1 changed files with 119 additions and 40 deletions
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addr2line.c
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@ -250,13 +250,24 @@ get_nth_dirname(unsigned long dir, const char *p)
return p;
}
static const char *parse_ver5_debug_line_header(const char *p, int idx, uint8_t format, obj_info_t *obj, const char **out_path, uint64_t *out_directory_index);
static void
fill_filename(int file, const char *include_directories, const char *filenames, line_info_t *line, obj_info_t *obj)
fill_filename(int file, uint8_t format, uint16_t version, const char *include_directories, const char *filenames, line_info_t *line, obj_info_t *obj)
{
int i;
const char *p = filenames;
const char *filename;
unsigned long dir;
if (version >= 5) {
const char *path;
uint64_t directory_index = -1;
parse_ver5_debug_line_header(filenames, file + 1, format, obj, &path, &directory_index);
line->filename = path;
parse_ver5_debug_line_header(include_directories, (int)directory_index, format, obj, &path, NULL);
line->dirname = path;
}
else {
for (i = 1; i <= file; i++) {
filename = p;
if (!*p) {
@ -279,10 +290,11 @@ fill_filename(int file, const char *include_directories, const char *filenames,
}
}
}
}
static void
fill_line(int num_traces, void **traces, uintptr_t addr, int file, int line,
const char *include_directories, const char *filenames,
uint8_t format, uint16_t version, const char *include_directories, const char *filenames,
obj_info_t *obj, line_info_t *lines, int offset)
{
int i;
@ -292,7 +304,7 @@ fill_line(int num_traces, void **traces, uintptr_t addr, int file, int line,
/* We assume one line code doesn't result >100 bytes of native code.
We may want more reliable way eventually... */
if (addr < a && a < addr + 100) {
fill_filename(file, include_directories, filenames, &lines[i], obj);
fill_filename(file, format, version, include_directories, filenames, &lines[i], obj);
lines[i].line = line;
}
}
@ -317,7 +329,7 @@ struct LineNumberProgramHeader {
};
static int
parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
parse_debug_line_header(obj_info_t *obj, const char **pp, struct LineNumberProgramHeader *header)
{
const char *p = *pp;
header->unit_length = *(uint32_t *)p;
@ -334,7 +346,13 @@ parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
header->version = *(uint16_t *)p;
p += sizeof(uint16_t);
if (header->version > 4) return -1;
if (header->version > 5) return -1;
if (header->version >= 5) {
/* address_size = *(uint8_t *)p++; */
/* segment_selector_size = *(uint8_t *)p++; */
p += 2;
}
header->header_length = header->format == 4 ? *(uint32_t *)p : *(uint64_t *)p;
p += header->format;
@ -355,6 +373,12 @@ parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
/* header->standard_opcode_lengths = (uint8_t *)p - 1; */
p += header->opcode_base - 1;
if (header->version >= 5) {
header->include_directories = p;
p = parse_ver5_debug_line_header(p, -1, header->format, obj, NULL, NULL);
header->filenames = p;
}
else {
header->include_directories = p;
/* temporary measure for compress-debug-sections */
@ -369,6 +393,7 @@ parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
p++;
header->filenames = p;
}
*pp = header->cu_start;
@ -394,13 +419,15 @@ parse_debug_line_cu(int num_traces, void **traces, const char **debug_line,
/* int epilogue_begin = 0; */
/* unsigned int isa = 0; */
if (parse_debug_line_header(&p, &header))
if (parse_debug_line_header(obj, &p, &header))
return -1;
is_stmt = header.default_is_stmt;
#define FILL_LINE() \
do { \
fill_line(num_traces, traces, addr, file, line, \
header.format, \
header.version, \
header.include_directories, \
header.filenames, \
obj, lines, offset); \
@ -839,6 +866,8 @@ typedef struct {
const char *current_cu;
uint64_t current_low_pc;
const char *debug_line_cu_end;
uint8_t debug_line_format;
uint16_t debug_line_version;
const char *debug_line_files;
const char *debug_line_directories;
const char *p;
@ -1022,10 +1051,12 @@ di_read_debug_line_cu(DebugInfoReader *reader)
struct LineNumberProgramHeader header;
p = (const char *)reader->debug_line_cu_end;
if (parse_debug_line_header(&p, &header))
if (parse_debug_line_header(reader->obj, &p, &header))
return -1;
reader->debug_line_cu_end = (char *)header.cu_end;
reader->debug_line_format = header.format;
reader->debug_line_version = header.version;
reader->debug_line_directories = (char *)header.include_directories;
reader->debug_line_files = (char *)header.filenames;
@ -1673,7 +1704,7 @@ debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
line.sname = get_cstr_value(&v);
break;
case DW_AT_call_file:
fill_filename((int)v.as.uint64, reader->debug_line_directories, reader->debug_line_files, &line, reader->obj);
fill_filename((int)v.as.uint64, reader->debug_line_format, reader->debug_line_version, reader->debug_line_directories, reader->debug_line_files, &line, reader->obj);
break;
case DW_AT_call_line:
line.line = (int)v.as.uint64;
@ -1700,7 +1731,7 @@ debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
uintptr_t offset = addr - reader->obj->base_addr + reader->obj->vmaddr;
uintptr_t saddr = ranges_include(reader, &ranges, offset);
if (saddr) {
/* fprintf(stderr, "%d:%tx: %d %lx->%lx %x %s: %s/%s %d %s %s %s\n",__LINE__,die.pos, i,addr,offset, die.tag,line.sname,line.dirname,line.filename,line.line,reader->obj->path,line.sname,lines[i].sname); */
/* fprintf(stdout, "%d:%tx: %d %lx->%lx %x %s: %s/%s %d %s %s %s\n",__LINE__,die.pos, i,addr,offset, die.tag,line.sname,line.dirname,line.filename,line.line,reader->obj->path,line.sname,lines[i].sname); */
if (lines[i].sname) {
line_info_t *lp = malloc(sizeof(line_info_t));
memcpy(lp, &lines[i], sizeof(line_info_t));
@ -1719,6 +1750,54 @@ debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
}
}
// This function parses the following attributes of Line Number Program Header in DWARF 5:
//
// * directory_entry_format_count
// * directory_entry_format
// * directories_count
// * directories
//
// or
//
// * file_name_entry_format_count
// * file_name_entry_format
// * file_names_count
// * file_names
//
// It records DW_LNCT_path and DW_LNCT_directory_index at the index "idx".
static const char *
parse_ver5_debug_line_header(const char *p, int idx, uint8_t format, obj_info_t *obj, const char **out_path, uint64_t *out_directory_index) {
int i, j;
int entry_format_count = *(uint8_t *)p++;
const char *entry_format = p;
/* skip the part of entry_format */
for (i = 0; i < entry_format_count * 2; i++) uleb128(&p);
int entry_count = (int)uleb128(&p);
DebugInfoReader reader;
debug_info_reader_init(&reader, obj);
reader.format = format;
reader.p = p;
for (j = 0; j < entry_count; j++) {
const char *format = entry_format;
for (i = 0; i < entry_format_count; i++) {
DebugInfoValue v = {{}};
unsigned long dw_lnct = uleb128(&format);
unsigned long dw_form = uleb128(&format);
debug_info_reader_read_value(&reader, dw_form, &v);
if (dw_lnct == 1 /* DW_LNCT_path */ && v.type == VAL_cstr && out_path)
*out_path = v.as.ptr + v.off;
if (dw_lnct == 2 /* DW_LNCT_directory_index */ && v.type == VAL_uint && out_directory_index)
*out_directory_index = v.as.uint64;
}
if (i == idx) return 0;
}
return reader.p;
}
#ifdef USE_ELF
static unsigned long
uncompress_debug_section(ElfW(Shdr) *shdr, char *file, char **ptr)