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267 lines (238 loc) · 8.5 KB
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#include "symboltable.h"
#include "vmprof.h"
#include "machine.h"
#include "khash.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <dlfcn.h>
#if defined(VMPROF_LINUX)
#include <link.h>
#endif
#ifdef _PY_TEST
#define LOG(...) printf(__VA_ARGS__)
#else
#define LOG(...)
#endif
#ifdef __APPLE__
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <mach-o/stab.h>
#include <mach-o/dyld.h>
#include <mach-o/dyld_images.h>
#include <mach-o/fat.h>
int dyld_index_for_hdr(const struct mach_header_64 * hdr)
{
const struct mach_header_64 * it;
int image_count = _dyld_image_count();
for (int i = 0; i < image_count; i++) {
it = (const struct mach_header_64*)_dyld_get_image_header(i);
if (it == hdr) {
return i;
}
}
return -1;
}
void lookup_vmprof_debug_info(const char * name, const void * h,
char * srcfile, int srcfile_len, int * lineno) {
const struct mach_header_64 * hdr = (const struct mach_header_64*)h;
const struct symtab_command *sc;
const struct load_command *lc;
int index = dyld_index_for_hdr(hdr);
intptr_t slide = _dyld_get_image_vmaddr_slide(index);
if (hdr->magic != MH_MAGIC_64) {
return;
}
if (hdr->cputype != CPU_TYPE_X86_64) {
return;
}
lc = (const struct load_command *)(hdr + 1);
struct segment_command_64 * __linkedit = NULL;
struct segment_command_64 * __text = NULL;
LOG(" mach-o hdr has %d commands\n", hdr->ncmds);
for (uint32_t j = 0; j < hdr->ncmds; j++, (lc = (const struct load_command *)((char *)lc + lc->cmdsize))) {
if (lc->cmd == LC_SEGMENT_64) {
struct segment_command_64 * sc = (struct segment_command_64*)lc;
//LOG("segment command %s %llx %llx foff %llx fsize %llx\n",
// sc->segname, sc->vmaddr, sc->vmsize, sc->fileoff, sc->filesize);
if (strncmp("__LINKEDIT", sc->segname, 16) == 0) {
//LOG("segment command %s\n", sc->segname);
__linkedit = sc;
}
if (strncmp("__TEXT", sc->segname, 16) == 0) {
__text = sc;
}
}
}
if (__linkedit == NULL) {
LOG("couldn't find __linkedit\n");
return;
} else if (__text == NULL) {
LOG("couldn't find __text\n");
return;
}
uint64_t fileoff = __linkedit->fileoff;
uint64_t vmaddr = __linkedit->vmaddr;
const char * baseaddr = (const char*) vmaddr + slide - fileoff;
const char * __text_baseaddr = (const char*) slide - __text->fileoff;
//LOG("%llx %llx %llx\n", slide, __text->vmaddr, __text->fileoff);
const char * path = NULL;
const char * filename = NULL;
uint32_t src_line = 0;
lc = (const struct load_command *)(hdr + 1);
for (uint32_t j = 0; j < hdr->ncmds; j++, (lc = (const struct load_command *)((char *)lc + lc->cmdsize))) {
if (lc->cmd == LC_SYMTAB) {
LOG(" cmd %d/%d is LC_SYMTAB\n", j, hdr->ncmds);
sc = (const struct symtab_command*) lc;
// skip if symtab entry is not populated
if (sc->symoff == 0) {
LOG("LC_SYMTAB.symoff == 0\n");
continue;
} else if (sc->stroff == 0) {
LOG("LC_SYMTAB.stroff == 0\n");
continue;
} else if (sc->nsyms == 0) {
LOG("LC_SYMTAB.nsym == 0\n");
continue;
} else if (sc->strsize == 0) {
LOG("LC_SYMTAB.strsize == 0\n");
continue;
}
const char * strtbl = (const char*)(baseaddr + sc->stroff);
struct nlist_64 * l = (struct nlist_64*)(baseaddr + sc->symoff);
//LOG("baseaddr %llx fileoff: %lx vmaddr %llx, symoff %llx stroff %llx slide %llx %d\n",
// baseaddr, fileoff, vmaddr, sc->symoff, sc->stroff, slide, sc->nsyms);
for (uint32_t s = 0; s < sc->nsyms; s++) {
struct nlist_64 * entry = &l[s];
uint32_t t = entry->n_type;
bool is_debug = (t & N_STAB) != 0;
if (!is_debug) {
continue;
}
uint32_t off = entry->n_un.n_strx;
if (off >= sc->strsize || off == 0) {
continue;
}
const char * sym = &strtbl[off];
if (sym[0] == '\x00') {
sym = NULL;
}
// switch through the different types
switch (t) {
case N_FUN: {
if (sym != NULL && strcmp(name, sym+1) == 0) {
*lineno = src_line;
if (src_line == 0) {
*lineno = entry->n_desc;
}
snprintf(srcfile, srcfile_len, "%s%s", path, filename);
}
break;
}
case N_SLINE: {
// does not seem to occur
src_line = entry->n_desc;
break;
}
case N_SO: {
// the first entry is the path, the second the filename,
// if a null occurs, the path and filename is reset
if (sym == NULL) {
path = NULL;
filename = NULL;
} else if (path == NULL) {
path = sym;
} else if (filename == NULL) {
filename = sym;
}
break;
}
}
}
}
}
}
#endif
#ifdef __unix__
#include "libbacktrace/backtrace.h"
void backtrace_error_cb(void *data, const char *msg, int errnum)
{
}
// a struct that helps to copy over data for the callbacks
typedef struct addr_info {
char * name;
int name_len;
char * srcfile;
int srcfile_len;
int * lineno;
} addr_info_t;
int backtrace_full_cb(void *data, uintptr_t pc, const char *filename,
int lineno, const char *function)
{
addr_info_t * info = (addr_info_t*)data;
if (function != NULL) {
// found the symbol name
(void)strncpy(info->name, function, info->name_len);
}
if (filename != NULL) {
(void)strncpy(info->srcfile, filename, info->srcfile_len);
}
*info->lineno = lineno;
return 0;
}
#endif
static
struct backtrace_state * bstate = NULL;
int vmp_resolve_addr(void * addr, char * name, int name_len, int * lineno, char * srcfile, int srcfile_len) {
#ifdef __APPLE__
Dl_info dlinfo;
if (dladdr((const void*)addr, &dlinfo) == 0) {
return 1;
}
if (dlinfo.dli_sname != NULL) {
(void)strncpy(name, dlinfo.dli_sname, name_len-1);
name[name_len-1] = 0;
}
lookup_vmprof_debug_info(name, dlinfo.dli_fbase, srcfile, srcfile_len, lineno);
// copy the shared object name to the source file name if source cannot be determined
if (srcfile[0] == 0 && dlinfo.dli_fname != NULL) {
(void)strncpy(srcfile, dlinfo.dli_fname, srcfile_len-1);
srcfile[srcfile_len-1] = 0;
}
#elif defined(VMPROF_LINUX)
if (bstate == NULL) {
bstate = backtrace_create_state (NULL, 1, backtrace_error_cb, NULL);
}
addr_info_t info = { .name = name, .name_len = name_len,
.srcfile = srcfile, .srcfile_len = srcfile_len,
.lineno = lineno
};
if (backtrace_pcinfo(bstate, (uintptr_t)addr, backtrace_full_cb,
backtrace_error_cb, (void*)&info)) {
// failed
return 1;
}
// nothing found, try with dladdr
if (info.name[0] == 0) {
Dl_info dlinfo;
dlinfo.dli_sname = NULL;
(void)dladdr((const void*)addr, &dlinfo);
if (dlinfo.dli_sname != NULL) {
(void)strncpy(info.name, dlinfo.dli_sname, info.name_len-1);
name[name_len-1] = 0;
}
}
// copy the shared object name to the source file name if source cannot be determined
if (srcfile[0] == 0) {
Dl_info dlinfo;
dlinfo.dli_fname = NULL;
(void)dladdr((const void*)addr, &dlinfo);
if (dlinfo.dli_fname != NULL) {
(void)strncpy(srcfile, dlinfo.dli_fname, srcfile_len-1);
srcfile[srcfile_len-1] = 0;
}
}
#endif
return 0;
}
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