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addr2line.c
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addr2line.c
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/**********************************************************************
addr2line.c -
$Author$
Copyright (C) 2010 Shinichiro Hamaji
**********************************************************************/
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wgnu-empty-initializer"
#pragma clang diagnostic ignored "-Wgcc-compat"
#endif
#include "ruby/internal/config.h"
#include "ruby/defines.h"
#include "ruby/missing.h"
#include "addr2line.h"
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_LIBPROC_H
#include <libproc.h>
#endif
#include "ruby/internal/stdbool.h"
#if defined(USE_ELF) || defined(HAVE_MACH_O_LOADER_H)
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/* Make alloca work the best possible way. */
#ifdef __GNUC__
# ifndef alloca
# define alloca __builtin_alloca
# endif
#else
# ifdef HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
void *alloca();
# endif
# endif /* AIX */
# endif /* HAVE_ALLOCA_H */
#endif /* __GNUC__ */
#ifdef HAVE_DLADDR
# include <dlfcn.h>
#endif
#ifdef HAVE_MACH_O_LOADER_H
# include <crt_externs.h>
# include <mach-o/fat.h>
# include <mach-o/loader.h>
# include <mach-o/nlist.h>
# include <mach-o/stab.h>
#endif
#ifdef USE_ELF
# ifdef __OpenBSD__
# include <elf_abi.h>
# else
# include <elf.h>
# endif
#ifndef ElfW
# if SIZEOF_VOIDP == 8
# define ElfW(x) Elf64##_##x
# else
# define ElfW(x) Elf32##_##x
# endif
#endif
#ifndef ELF_ST_TYPE
# if SIZEOF_VOIDP == 8
# define ELF_ST_TYPE ELF64_ST_TYPE
# else
# define ELF_ST_TYPE ELF32_ST_TYPE
# endif
#endif
#endif
#ifdef SHF_COMPRESSED
# if defined(ELFCOMPRESS_ZLIB) && defined(HAVE_LIBZ)
/* FreeBSD 11.0 lacks ELFCOMPRESS_ZLIB */
# include <zlib.h>
# define SUPPORT_COMPRESSED_DEBUG_LINE
# endif
#else /* compatibility with glibc < 2.22 */
# define SHF_COMPRESSED 0
#endif
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
#define DW_LNS_copy 0x01
#define DW_LNS_advance_pc 0x02
#define DW_LNS_advance_line 0x03
#define DW_LNS_set_file 0x04
#define DW_LNS_set_column 0x05
#define DW_LNS_negate_stmt 0x06
#define DW_LNS_set_basic_block 0x07
#define DW_LNS_const_add_pc 0x08
#define DW_LNS_fixed_advance_pc 0x09
#define DW_LNS_set_prologue_end 0x0a /* DWARF3 */
#define DW_LNS_set_epilogue_begin 0x0b /* DWARF3 */
#define DW_LNS_set_isa 0x0c /* DWARF3 */
/* Line number extended opcode name. */
#define DW_LNE_end_sequence 0x01
#define DW_LNE_set_address 0x02
#define DW_LNE_define_file 0x03
#define DW_LNE_set_discriminator 0x04 /* DWARF4 */
PRINTF_ARGS(static int kprintf(const char *fmt, ...), 1, 2);
typedef struct line_info {
const char *dirname;
const char *filename;
const char *path; /* object path */
int line;
uintptr_t base_addr;
uintptr_t saddr;
const char *sname; /* function name */
struct line_info *next;
} line_info_t;
struct dwarf_section {
char *ptr;
size_t size;
uint64_t flags;
};
typedef struct obj_info {
const char *path; /* object path */
char *mapped;
size_t mapped_size;
void *uncompressed;
uintptr_t base_addr;
uintptr_t vmaddr;
struct dwarf_section debug_abbrev;
struct dwarf_section debug_info;
struct dwarf_section debug_line;
struct dwarf_section debug_ranges;
struct dwarf_section debug_rnglists;
struct dwarf_section debug_str;
struct obj_info *next;
} obj_info_t;
#define DWARF_SECTION_COUNT 6
static struct dwarf_section *
obj_dwarf_section_at(obj_info_t *obj, int n)
{
struct dwarf_section *ary[] = {
&obj->debug_abbrev,
&obj->debug_info,
&obj->debug_line,
&obj->debug_ranges,
&obj->debug_rnglists,
&obj->debug_str
};
if (n < 0 || DWARF_SECTION_COUNT <= n) {
abort();
}
return ary[n];
}
struct debug_section_definition {
const char *name;
struct dwarf_section *dwarf;
};
/* Avoid consuming stack as this module may be used from signal handler */
static char binary_filename[PATH_MAX + 1];
static unsigned long
uleb128(const char **p)
{
unsigned long r = 0;
int s = 0;
for (;;) {
unsigned char b = (unsigned char)*(*p)++;
if (b < 0x80) {
r += (unsigned long)b << s;
break;
}
r += (b & 0x7f) << s;
s += 7;
}
return r;
}
static long
sleb128(const char **p)
{
long r = 0;
int s = 0;
for (;;) {
unsigned char b = (unsigned char)*(*p)++;
if (b < 0x80) {
if (b & 0x40) {
r -= (0x80 - b) << s;
}
else {
r += (b & 0x3f) << s;
}
break;
}
r += (b & 0x7f) << s;
s += 7;
}
return r;
}
static const char *
get_nth_dirname(unsigned long dir, const char *p)
{
if (!dir--) {
return "";
}
while (dir--) {
while (*p) p++;
p++;
if (!*p) {
kprintf("Unexpected directory number %lu in %s\n",
dir, binary_filename);
return "";
}
}
return p;
}
static void
fill_filename(int file, 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;
for (i = 1; i <= file; i++) {
filename = p;
if (!*p) {
/* Need to output binary file name? */
kprintf("Unexpected file number %d in %s at %tx\n",
file, binary_filename, filenames - obj->mapped);
return;
}
while (*p) p++;
p++;
dir = uleb128(&p);
/* last modified. */
uleb128(&p);
/* size of the file. */
uleb128(&p);
if (i == file) {
line->filename = filename;
line->dirname = get_nth_dirname(dir, include_directories);
}
}
}
static void
fill_line(int num_traces, void **traces, uintptr_t addr, int file, int line,
const char *include_directories, const char *filenames,
obj_info_t *obj, line_info_t *lines, int offset)
{
int i;
addr += obj->base_addr - obj->vmaddr;
for (i = offset; i < num_traces; i++) {
uintptr_t a = (uintptr_t)traces[i];
/* 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);
lines[i].line = line;
}
}
}
struct LineNumberProgramHeader {
uint64_t unit_length;
uint16_t version;
uint8_t format; /* 4 or 8 */
uint64_t header_length;
uint8_t minimum_instruction_length;
uint8_t maximum_operations_per_instruction;
uint8_t default_is_stmt;
int8_t line_base;
uint8_t line_range;
uint8_t opcode_base;
/* uint8_t standard_opcode_lengths[opcode_base-1]; */
const char *include_directories;
const char *filenames;
const char *cu_start;
const char *cu_end;
};
static int
parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
{
const char *p = *pp;
header->unit_length = *(uint32_t *)p;
p += sizeof(uint32_t);
header->format = 4;
if (header->unit_length == 0xffffffff) {
header->unit_length = *(uint64_t *)p;
p += sizeof(uint64_t);
header->format = 8;
}
header->cu_end = p + header->unit_length;
header->version = *(uint16_t *)p;
p += sizeof(uint16_t);
if (header->version > 4) return -1;
header->header_length = header->format == 4 ? *(uint32_t *)p : *(uint64_t *)p;
p += header->format;
header->cu_start = p + header->header_length;
header->minimum_instruction_length = *(uint8_t *)p++;
if (header->version >= 4) {
/* maximum_operations_per_instruction = *(uint8_t *)p; */
if (*p != 1) return -1; /* For non-VLIW architectures, this field is 1 */
p++;
}
header->default_is_stmt = *(uint8_t *)p++;
header->line_base = *(int8_t *)p++;
header->line_range = *(uint8_t *)p++;
header->opcode_base = *(uint8_t *)p++;
/* header->standard_opcode_lengths = (uint8_t *)p - 1; */
p += header->opcode_base - 1;
header->include_directories = p;
/* temporary measure for compress-debug-sections */
if (p >= header->cu_end) return -1;
/* skip include directories */
while (*p) {
p = memchr(p, '\0', header->cu_end - p);
if (!p) return -1;
p++;
}
p++;
header->filenames = p;
*pp = header->cu_start;
return 0;
}
static int
parse_debug_line_cu(int num_traces, void **traces, const char **debug_line,
obj_info_t *obj, line_info_t *lines, int offset)
{
const char *p = (const char *)*debug_line;
struct LineNumberProgramHeader header;
/* The registers. */
unsigned long addr = 0;
unsigned int file = 1;
unsigned int line = 1;
/* unsigned int column = 0; */
int is_stmt;
/* int basic_block = 0; */
/* int end_sequence = 0; */
/* int prologue_end = 0; */
/* int epilogue_begin = 0; */
/* unsigned int isa = 0; */
if (parse_debug_line_header(&p, &header))
return -1;
is_stmt = header.default_is_stmt;
#define FILL_LINE() \
do { \
fill_line(num_traces, traces, addr, file, line, \
header.include_directories, \
header.filenames, \
obj, lines, offset); \
/*basic_block = prologue_end = epilogue_begin = 0;*/ \
} while (0)
while (p < header.cu_end) {
unsigned long a;
unsigned char op = *p++;
switch (op) {
case DW_LNS_copy:
FILL_LINE();
break;
case DW_LNS_advance_pc:
a = uleb128(&p) * header.minimum_instruction_length;
addr += a;
break;
case DW_LNS_advance_line: {
long a = sleb128(&p);
line += a;
break;
}
case DW_LNS_set_file:
file = (unsigned int)uleb128(&p);
break;
case DW_LNS_set_column:
/*column = (unsigned int)*/(void)uleb128(&p);
break;
case DW_LNS_negate_stmt:
is_stmt = !is_stmt;
break;
case DW_LNS_set_basic_block:
/*basic_block = 1; */
break;
case DW_LNS_const_add_pc:
a = ((255UL - header.opcode_base) / header.line_range) *
header.minimum_instruction_length;
addr += a;
break;
case DW_LNS_fixed_advance_pc:
a = *(uint16_t *)p;
p += sizeof(uint16_t);
addr += a;
break;
case DW_LNS_set_prologue_end:
/* prologue_end = 1; */
break;
case DW_LNS_set_epilogue_begin:
/* epilogue_begin = 1; */
break;
case DW_LNS_set_isa:
/* isa = (unsigned int)*/(void)uleb128(&p);
break;
case 0:
a = uleb128(&p);
op = *p++;
switch (op) {
case DW_LNE_end_sequence:
/* end_sequence = 1; */
FILL_LINE();
addr = 0;
file = 1;
line = 1;
/* column = 0; */
is_stmt = header.default_is_stmt;
/* end_sequence = 0; */
/* isa = 0; */
break;
case DW_LNE_set_address:
addr = *(unsigned long *)p;
p += sizeof(unsigned long);
break;
case DW_LNE_define_file:
kprintf("Unsupported operation in %s\n",
binary_filename);
break;
case DW_LNE_set_discriminator:
/* TODO:currently ignore */
uleb128(&p);
break;
default:
kprintf("Unknown extended opcode: %d in %s\n",
op, binary_filename);
}
break;
default: {
uint8_t adjusted_opcode = op - header.opcode_base;
uint8_t operation_advance = adjusted_opcode / header.line_range;
/* NOTE: this code doesn't support VLIW */
addr += operation_advance * header.minimum_instruction_length;
line += header.line_base + (adjusted_opcode % header.line_range);
FILL_LINE();
}
}
}
*debug_line = (char *)p;
return 0;
}
static int
parse_debug_line(int num_traces, void **traces,
const char *debug_line, unsigned long size,
obj_info_t *obj, line_info_t *lines, int offset)
{
const char *debug_line_end = debug_line + size;
while (debug_line < debug_line_end) {
if (parse_debug_line_cu(num_traces, traces, &debug_line, obj, lines, offset))
return -1;
}
if (debug_line != debug_line_end) {
kprintf("Unexpected size of .debug_line in %s\n",
binary_filename);
}
return 0;
}
/* read file and fill lines */
static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink,
obj_info_t **objp, line_info_t *lines, int offset);
static void
append_obj(obj_info_t **objp)
{
obj_info_t *newobj = calloc(1, sizeof(obj_info_t));
if (*objp) (*objp)->next = newobj;
*objp = newobj;
}
#ifdef USE_ELF
/* Ideally we should check 4 paths to follow gnu_debuglink:
*
* - /usr/lib/debug/.build-id/ab/cdef1234.debug
* - /usr/bin/ruby.debug
* - /usr/bin/.debug/ruby.debug
* - /usr/lib/debug/usr/bin/ruby.debug.
*
* but we handle only two cases for now as the two formats are
* used by some linux distributions.
*
* See GDB's info for detail.
* https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html
*/
// check the path pattern of "/usr/lib/debug/usr/bin/ruby.debug"
static void
follow_debuglink(const char *debuglink, int num_traces, void **traces,
obj_info_t **objp, line_info_t *lines, int offset)
{
static const char global_debug_dir[] = "/usr/lib/debug";
const size_t global_debug_dir_len = sizeof(global_debug_dir) - 1;
char *p;
obj_info_t *o1 = *objp, *o2;
size_t len;
p = strrchr(binary_filename, '/');
if (!p) {
return;
}
p[1] = '\0';
len = strlen(binary_filename);
if (len >= PATH_MAX - global_debug_dir_len)
len = PATH_MAX - global_debug_dir_len - 1;
memmove(binary_filename + global_debug_dir_len, binary_filename, len);
memcpy(binary_filename, global_debug_dir, global_debug_dir_len);
len += global_debug_dir_len;
strlcpy(binary_filename + len, debuglink, PATH_MAX - len);
append_obj(objp);
o2 = *objp;
o2->base_addr = o1->base_addr;
o2->path = o1->path;
fill_lines(num_traces, traces, 0, objp, lines, offset);
}
// check the path pattern of "/usr/lib/debug/.build-id/ab/cdef1234.debug"
static void
follow_debuglink_build_id(const char *build_id, size_t build_id_size, int num_traces, void **traces,
obj_info_t **objp, line_info_t *lines, int offset)
{
static const char global_debug_dir[] = "/usr/lib/debug/.build-id/";
const size_t global_debug_dir_len = sizeof(global_debug_dir) - 1;
char *p;
obj_info_t *o1 = *objp, *o2;
size_t i;
if (PATH_MAX < global_debug_dir_len + 1 + build_id_size * 2 + 6) return;
memcpy(binary_filename, global_debug_dir, global_debug_dir_len);
p = binary_filename + global_debug_dir_len;
for (i = 0; i < build_id_size; i++) {
static const char tbl[] = "0123456789abcdef";
unsigned char n = build_id[i];
*p++ = tbl[n / 16];
*p++ = tbl[n % 16];
if (i == 0) *p++ = '/';
}
strcpy(p, ".debug");
append_obj(objp);
o2 = *objp;
o2->base_addr = o1->base_addr;
o2->path = o1->path;
fill_lines(num_traces, traces, 0, objp, lines, offset);
}
#endif
enum
{
DW_TAG_compile_unit = 0x11,
DW_TAG_inlined_subroutine = 0x1d,
DW_TAG_subprogram = 0x2e,
};
/* Attributes encodings */
enum
{
DW_AT_sibling = 0x01,
DW_AT_location = 0x02,
DW_AT_name = 0x03,
/* Reserved 0x04 */
/* Reserved 0x05 */
/* Reserved 0x06 */
/* Reserved 0x07 */
/* Reserved 0x08 */
DW_AT_ordering = 0x09,
/* Reserved 0x0a */
DW_AT_byte_size = 0x0b,
/* Reserved 0x0c */
DW_AT_bit_size = 0x0d,
/* Reserved 0x0e */
/* Reserved 0x0f */
DW_AT_stmt_list = 0x10,
DW_AT_low_pc = 0x11,
DW_AT_high_pc = 0x12,
DW_AT_language = 0x13,
/* Reserved 0x14 */
DW_AT_discr = 0x15,
DW_AT_discr_value = 0x16,
DW_AT_visibility = 0x17,
DW_AT_import = 0x18,
DW_AT_string_length = 0x19,
DW_AT_common_reference = 0x1a,
DW_AT_comp_dir = 0x1b,
DW_AT_const_value = 0x1c,
DW_AT_containing_type = 0x1d,
DW_AT_default_value = 0x1e,
/* Reserved 0x1f */
DW_AT_inline = 0x20,
DW_AT_is_optional = 0x21,
DW_AT_lower_bound = 0x22,
/* Reserved 0x23 */
/* Reserved 0x24 */
DW_AT_producer = 0x25,
/* Reserved 0x26 */
DW_AT_prototyped = 0x27,
/* Reserved 0x28 */
/* Reserved 0x29 */
DW_AT_return_addr = 0x2a,
/* Reserved 0x2b */
DW_AT_start_scope = 0x2c,
/* Reserved 0x2d */
DW_AT_bit_stride = 0x2e,
DW_AT_upper_bound = 0x2f,
/* Reserved 0x30 */
DW_AT_abstract_origin = 0x31,
DW_AT_accessibility = 0x32,
DW_AT_address_class = 0x33,
DW_AT_artificial = 0x34,
DW_AT_base_types = 0x35,
DW_AT_calling_convention = 0x36,
DW_AT_count = 0x37,
DW_AT_data_member_location = 0x38,
DW_AT_decl_column = 0x39,
DW_AT_decl_file = 0x3a,
DW_AT_decl_line = 0x3b,
DW_AT_declaration = 0x3c,
DW_AT_discr_list = 0x3d,
DW_AT_encoding = 0x3e,
DW_AT_external = 0x3f,
DW_AT_frame_base = 0x40,
DW_AT_friend = 0x41,
DW_AT_identifier_case = 0x42,
/* Reserved 0x43 */
DW_AT_namelist_item = 0x44,
DW_AT_priority = 0x45,
DW_AT_segment = 0x46,
DW_AT_specification = 0x47,
DW_AT_static_link = 0x48,
DW_AT_type = 0x49,
DW_AT_use_location = 0x4a,
DW_AT_variable_parameter = 0x4b,
DW_AT_virtuality = 0x4c,
DW_AT_vtable_elem_location = 0x4d,
DW_AT_allocated = 0x4e,
DW_AT_associated = 0x4f,
DW_AT_data_location = 0x50,
DW_AT_byte_stride = 0x51,
DW_AT_entry_pc = 0x52,
DW_AT_use_UTF8 = 0x53,
DW_AT_extension = 0x54,
DW_AT_ranges = 0x55,
DW_AT_trampoline = 0x56,
DW_AT_call_column = 0x57,
DW_AT_call_file = 0x58,
DW_AT_call_line = 0x59,
DW_AT_description = 0x5a,
DW_AT_binary_scale = 0x5b,
DW_AT_decimal_scale = 0x5c,
DW_AT_small = 0x5d,
DW_AT_decimal_sign = 0x5e,
DW_AT_digit_count = 0x5f,
DW_AT_picture_string = 0x60,
DW_AT_mutable = 0x61,
DW_AT_threads_scaled = 0x62,
DW_AT_explicit = 0x63,
DW_AT_object_pointer = 0x64,
DW_AT_endianity = 0x65,
DW_AT_elemental = 0x66,
DW_AT_pure = 0x67,
DW_AT_recursive = 0x68,
DW_AT_signature = 0x69,
DW_AT_main_subprogram = 0x6a,
DW_AT_data_bit_offset = 0x6b,
DW_AT_const_expr = 0x6c,
DW_AT_enum_class = 0x6d,
DW_AT_linkage_name = 0x6e,
DW_AT_string_length_bit_size = 0x6f,
DW_AT_string_length_byte_size = 0x70,
DW_AT_rank = 0x71,
DW_AT_str_offsets_base = 0x72,
DW_AT_addr_base = 0x73,
DW_AT_rnglists_base = 0x74,
/* Reserved 0x75 */
DW_AT_dwo_name = 0x76,
DW_AT_reference = 0x77,
DW_AT_rvalue_reference = 0x78,
DW_AT_macros = 0x79,
DW_AT_call_all_calls = 0x7a,
DW_AT_call_all_source_calls = 0x7b,
DW_AT_call_all_tail_calls = 0x7c,
DW_AT_call_return_pc = 0x7d,
DW_AT_call_value = 0x7e,
DW_AT_call_origin = 0x7f,
DW_AT_call_parameter = 0x80,
DW_AT_call_pc = 0x81,
DW_AT_call_tail_call = 0x82,
DW_AT_call_target = 0x83,
DW_AT_call_target_clobbered = 0x84,
DW_AT_call_data_location = 0x85,
DW_AT_call_data_value = 0x86,
DW_AT_noreturn = 0x87,
DW_AT_alignment = 0x88,
DW_AT_export_symbols = 0x89,
DW_AT_deleted = 0x8a,
DW_AT_defaulted = 0x8b,
DW_AT_loclists_base = 0x8c,
DW_AT_lo_user = 0x2000,
DW_AT_hi_user = 0x3fff
};
/* Attribute form encodings */
enum
{
DW_FORM_addr = 0x01,
/* Reserved 0x02 */
DW_FORM_block2 = 0x03,
DW_FORM_block4 = 0x04,
DW_FORM_data2 = 0x05,
DW_FORM_data4 = 0x06,
DW_FORM_data8 = 0x07,
DW_FORM_string = 0x08,
DW_FORM_block = 0x09,
DW_FORM_block1 = 0x0a,
DW_FORM_data1 = 0x0b,
DW_FORM_flag = 0x0c,
DW_FORM_sdata = 0x0d,
DW_FORM_strp = 0x0e,
DW_FORM_udata = 0x0f,
DW_FORM_ref_addr = 0x10,
DW_FORM_ref1 = 0x11,
DW_FORM_ref2 = 0x12,
DW_FORM_ref4 = 0x13,
DW_FORM_ref8 = 0x14,
DW_FORM_ref_udata = 0x15,
DW_FORM_indirect = 0x16,
DW_FORM_sec_offset = 0x17,
DW_FORM_exprloc = 0x18,
DW_FORM_flag_present = 0x19,
DW_FORM_strx = 0x1a,
DW_FORM_addrx = 0x1b,
DW_FORM_ref_sup4 = 0x1c,
DW_FORM_strp_sup = 0x1d,
DW_FORM_data16 = 0x1e,
DW_FORM_line_strp = 0x1f,
DW_FORM_ref_sig8 = 0x20,
DW_FORM_implicit_const = 0x21,
DW_FORM_loclistx = 0x22,
DW_FORM_rnglistx = 0x23,
DW_FORM_ref_sup8 = 0x24,
DW_FORM_strx1 = 0x25,
DW_FORM_strx2 = 0x26,
DW_FORM_strx3 = 0x27,
DW_FORM_strx4 = 0x28,
DW_FORM_addrx1 = 0x29,
DW_FORM_addrx2 = 0x2a,
DW_FORM_addrx3 = 0x2b,
DW_FORM_addrx4 = 0x2c
};
/* Range list entry encodings */
enum {
DW_RLE_end_of_list = 0x00,
DW_RLE_base_addressx = 0x01,
DW_RLE_startx_endx = 0x02,
DW_RLE_startx_length = 0x03,
DW_RLE_offset_pair = 0x04,
DW_RLE_base_address = 0x05,
DW_RLE_start_end = 0x06,
DW_RLE_start_length = 0x07
};
enum {
VAL_none = 0,
VAL_cstr = 1,
VAL_data = 2,
VAL_uint = 3,
VAL_int = 4
};
# define ABBREV_TABLE_SIZE 256
typedef struct {
obj_info_t *obj;
const char *file;
const char *current_cu;
uint64_t current_low_pc;
const char *debug_line_cu_end;
const char *debug_line_files;
const char *debug_line_directories;
const char *p;
const char *cu_end;
const char *pend;
const char *q0;
const char *q;
int format; // 4 or 8
uint8_t address_size;
int level;
const char *abbrev_table[ABBREV_TABLE_SIZE];
} DebugInfoReader;
typedef struct {
ptrdiff_t pos;
int tag;
int has_children;
} DIE;
typedef struct {
union {
const char *ptr;
uint64_t uint64;
int64_t int64;
} as;
uint64_t off;
uint64_t at;
uint64_t form;
size_t size;
int type;
} DebugInfoValue;
/* TODO: Big Endian */
#define MERGE_2INTS(a,b,sz) (((uint64_t)(b)<<sz)|(a))
static uint16_t
get_uint16(const uint8_t *p)
{
return (uint16_t)MERGE_2INTS(p[0],p[1],8);
}
static uint32_t
get_uint32(const uint8_t *p)
{
return (uint32_t)MERGE_2INTS(get_uint16(p),get_uint16(p+2),16);
}
static uint64_t
get_uint64(const uint8_t *p)
{
return MERGE_2INTS(get_uint32(p),get_uint32(p+4),32);
}
static uint8_t
read_uint8(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 1);
return (uint8_t)*p;
}
static uint16_t
read_uint16(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 2);
return get_uint16((const uint8_t *)p);
}
static uint32_t
read_uint24(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 3);
return ((uint8_t)*p << 16) | get_uint16((const uint8_t *)p+1);
}
static uint32_t
read_uint32(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 4);
return get_uint32((const uint8_t *)p);
}
static uint64_t
read_uint64(const char **ptr)
{
const unsigned char *p = (const unsigned char *)*ptr;
*ptr = (char *)(p + 8);
return get_uint64(p);
}
static uintptr_t
read_uintptr(const char **ptr)
{
const unsigned char *p = (const unsigned char *)*ptr;
*ptr = (char *)(p + SIZEOF_VOIDP);
#if SIZEOF_VOIDP == 8
return get_uint64(p);
#else
return get_uint32(p);
#endif
}
static uint64_t
read_uint(DebugInfoReader *reader)
{
if (reader->format == 4) {
return read_uint32(&reader->p);
} else { /* 64 bit */
return read_uint64(&reader->p);
}
}
static uint64_t
read_uleb128(DebugInfoReader *reader)
{
return uleb128(&reader->p);
}
static int64_t
read_sleb128(DebugInfoReader *reader)
{
return sleb128(&reader->p);
}
static void
debug_info_reader_init(DebugInfoReader *reader, obj_info_t *obj)
{
reader->file = obj->mapped;
reader->obj = obj;
reader->p = obj->debug_info.ptr;
reader->pend = obj->debug_info.ptr + obj->debug_info.size;
reader->debug_line_cu_end = obj->debug_line.ptr;
reader->current_low_pc = 0;
}
static void
di_skip_die_attributes(const char **p)
{
for (;;) {
uint64_t at = uleb128(p);
uint64_t form = uleb128(p);
if (!at && !form) break;
switch (form) {
default:
break;
case DW_FORM_implicit_const:
sleb128(p);
break;
}
}
}
static void
di_read_debug_abbrev_cu(DebugInfoReader *reader)
{
uint64_t prev = 0;
const char *p = reader->q0;
for (;;) {