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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include "dwarf.h"
#include "libdwarf.h"
static void parse_dwarf(Dwarf_Debug dbg, const char *struct_name, const char *field_name);
static void parse_level(Dwarf_Debug dbg, Dwarf_Die die, const char *struct_name, const char *field_name, int level);
void usage(char *argv[]) {
printf("%s file struct field\n", argv[0]);
}
int main(int argc, char *argv[]) {
Dwarf_Debug dbg = 0;
int fd = -1;
const char *filepath;
const char *struct_name, *field_name;
int res = DW_DLV_ERROR;
Dwarf_Error error;
Dwarf_Handler errhand = 0;
Dwarf_Ptr errarg = 0;
if(argc < 4) {
usage(argv);
exit(1);
}
filepath = argv[1];
struct_name = argv[2];
field_name = argv[3];
fd = open(filepath,O_RDONLY);
if(fd < 0) {
printf("Failure attempting to open %s\n",filepath);
}
res = dwarf_init(fd,DW_DLC_READ,errhand,errarg, &dbg,&error);
if(res != DW_DLV_OK) {
printf("Giving up, cannot do DWARF processing\n");
exit(1);
}
parse_dwarf(dbg, struct_name, field_name);
res = dwarf_finish(dbg,&error);
if(res != DW_DLV_OK) {
printf("dwarf_finish failed!\n");
}
close(fd);
return 0;
}
static void parse_dwarf(Dwarf_Debug dbg, const char *struct_name,
const char *field_name) {
Dwarf_Bool is_info = 1;
Dwarf_Unsigned cu_length;
Dwarf_Half cu_version;
Dwarf_Off cu_abbrev_offset;
Dwarf_Half cu_pointer_size;
Dwarf_Half cu_offset_size;
Dwarf_Half cu_extension_size;
Dwarf_Sig8 type_signature;
Dwarf_Unsigned type_offset;
Dwarf_Unsigned cu_next_offset;
Dwarf_Error err;
int rc;
while (1) {
Dwarf_Die die, next;
rc = dwarf_next_cu_header_c(dbg, is_info, &cu_length,
&cu_version, &cu_abbrev_offset, &cu_pointer_size,
&cu_offset_size, &cu_extension_size, &type_signature,
&type_offset, &cu_next_offset, &err);
if (rc == DW_DLV_NO_ENTRY)
break;
if (rc != DW_DLV_OK) {
printf("error dwarf_next_cu_header_c: %d %s\n", rc, dwarf_errmsg(err));
exit(1);
}
rc = dwarf_siblingof(dbg, NULL, &die, &err);
if (rc != DW_DLV_OK) {
printf("first dwarf_siblingof failed: %d %s\n", rc, dwarf_errmsg(err));
exit(1);
}
parse_level(dbg, die, struct_name, field_name, 0);
}
printf("struct %s / member %s not found\n", struct_name, field_name);
exit(2);
}
static void parse_level(Dwarf_Debug dbg, Dwarf_Die die, const char *struct_name, const char *field_name, int level) {
Dwarf_Die next;
Dwarf_Error err;
int rc;
do {
char *name;
const char *tag_name;
Dwarf_Half tag;
rc = dwarf_diename(die, &name, &err);
if (rc == DW_DLV_NO_ENTRY) {
printf("no diename for %p?\n", die);
break;
}
if (rc != DW_DLV_OK) {
printf("dwarf_diename error: %d %s\n", rc, dwarf_errmsg(err));
exit(1);
}
rc = dwarf_tag(die, &tag, &err);
if (rc != DW_DLV_OK) {
printf("dwarf_tag error: %d %s\n", rc, dwarf_errmsg(err));
exit(1);
}
rc = dwarf_get_TAG_name(tag, &tag_name);
if (rc != DW_DLV_OK) {
printf("dwarf_get_TAG_name error: %d\n", rc);
exit(1);
}
printf("<%d> %p <%d> %s: %s\n", level, die, tag, tag_name, name);
rc = dwarf_siblingof(dbg, die, &next, &err);
dwarf_dealloc(dbg, die, DW_DLA_DIE);
die = next;
} while (die);
}
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