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//===-- tsan_symbolize_addr2line.cc ---------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "tsan_symbolize.h"
#include "tsan_mman.h"
#include "tsan_rtl.h"
#include "tsan_platform.h"
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <link.h>
#include <linux/limits.h>
#include <sys/types.h>
namespace __tsan {
struct ModuleDesc {
const char *fullname;
const char *name;
uptr base;
int inp_fd;
int out_fd;
};
struct SectionDesc {
SectionDesc *next;
ModuleDesc *module;
uptr base;
uptr end;
};
struct DlIteratePhdrCtx {
SectionDesc *sections;
bool is_first;
};
static void NOINLINE InitModule(ModuleDesc *m) {
int outfd[2] = {};
if (pipe(&outfd[0])) {
Printf("ThreadSanitizer: outfd pipe() failed (%d)\n", errno);
Die();
}
int infd[2] = {};
if (pipe(&infd[0])) {
Printf("ThreadSanitizer: infd pipe() failed (%d)\n", errno);
Die();
}
int pid = fork();
if (pid == 0) {
internal_close(STDOUT_FILENO);
internal_close(STDIN_FILENO);
internal_dup2(outfd[0], STDIN_FILENO);
internal_dup2(infd[1], STDOUT_FILENO);
internal_close(outfd[0]);
internal_close(outfd[1]);
internal_close(infd[0]);
internal_close(infd[1]);
for (int fd = getdtablesize(); fd > 2; fd--)
internal_close(fd);
execl("/usr/bin/addr2line", "/usr/bin/addr2line", "-Cfe", m->fullname, 0);
_exit(0);
} else if (pid < 0) {
Printf("ThreadSanitizer: failed to fork symbolizer\n");
Die();
}
internal_close(outfd[0]);
internal_close(infd[1]);
m->inp_fd = infd[0];
m->out_fd = outfd[1];
}
static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
DlIteratePhdrCtx *ctx = (DlIteratePhdrCtx*)arg;
InternalScopedBuffer<char> tmp(128);
if (ctx->is_first) {
internal_snprintf(tmp.data(), tmp.size(), "/proc/%d/exe",
(int)internal_getpid());
info->dlpi_name = tmp.data();
}
ctx->is_first = false;
if (info->dlpi_name == 0 || info->dlpi_name[0] == 0)
return 0;
ModuleDesc *m = (ModuleDesc*)internal_alloc(MBlockReportStack,
sizeof(ModuleDesc));
m->fullname = internal_strdup(info->dlpi_name);
m->name = internal_strrchr(m->fullname, '/');
if (m->name)
m->name += 1;
else
m->name = m->fullname;
m->base = (uptr)info->dlpi_addr;
m->inp_fd = -1;
m->out_fd = -1;
DPrintf2("Module %s %zx\n", m->name, m->base);
for (int i = 0; i < info->dlpi_phnum; i++) {
const Elf64_Phdr *s = &info->dlpi_phdr[i];
DPrintf2(" Section p_type=%zx p_offset=%zx p_vaddr=%zx p_paddr=%zx"
" p_filesz=%zx p_memsz=%zx p_flags=%zx p_align=%zx\n",
(uptr)s->p_type, (uptr)s->p_offset, (uptr)s->p_vaddr,
(uptr)s->p_paddr, (uptr)s->p_filesz, (uptr)s->p_memsz,
(uptr)s->p_flags, (uptr)s->p_align);
if (s->p_type != PT_LOAD)
continue;
SectionDesc *sec = (SectionDesc*)internal_alloc(MBlockReportStack,
sizeof(SectionDesc));
sec->module = m;
sec->base = info->dlpi_addr + s->p_vaddr;
sec->end = sec->base + s->p_memsz;
sec->next = ctx->sections;
ctx->sections = sec;
DPrintf2(" Section %zx-%zx\n", sec->base, sec->end);
}
return 0;
}
static SectionDesc *InitSections() {
DlIteratePhdrCtx ctx = {0, true};
dl_iterate_phdr(dl_iterate_phdr_cb, &ctx);
return ctx.sections;
}
static SectionDesc *GetSectionDesc(uptr addr) {
static SectionDesc *sections = 0;
if (sections == 0)
sections = InitSections();
for (SectionDesc *s = sections; s; s = s->next) {
if (addr >= s->base && addr < s->end) {
if (s->module->inp_fd == -1)
InitModule(s->module);
return s;
}
}
return 0;
}
ReportStack *SymbolizeCodeAddr2Line(uptr addr) {
SectionDesc *s = GetSectionDesc(addr);
if (s == 0)
return NewReportStackEntry(addr);
ModuleDesc *m = s->module;
uptr offset = addr - m->base;
char addrstr[32];
internal_snprintf(addrstr, sizeof(addrstr), "%p\n", (void*)offset);
if (0 >= internal_write(m->out_fd, addrstr, internal_strlen(addrstr))) {
Printf("ThreadSanitizer: can't write from symbolizer (%d, %d)\n",
m->out_fd, errno);
Die();
}
InternalScopedBuffer<char> func(1024);
ssize_t len = internal_read(m->inp_fd, func.data(), func.size() - 1);
if (len <= 0) {
Printf("ThreadSanitizer: can't read from symbolizer (%d, %d)\n",
m->inp_fd, errno);
Die();
}
func.data()[len] = 0;
ReportStack *res = NewReportStackEntry(addr);
res->module = internal_strdup(m->name);
res->offset = offset;
char *pos = (char*)internal_strchr(func.data(), '\n');
if (pos && func[0] != '?') {
res->func = (char*)internal_alloc(MBlockReportStack, pos - func.data() + 1);
internal_memcpy(res->func, func.data(), pos - func.data());
res->func[pos - func.data()] = 0;
char *pos2 = (char*)internal_strchr(pos, ':');
if (pos2) {
res->file = (char*)internal_alloc(MBlockReportStack, pos2 - pos - 1 + 1);
internal_memcpy(res->file, pos + 1, pos2 - pos - 1);
res->file[pos2 - pos - 1] = 0;
res->line = atoi(pos2 + 1);
}
}
return res;
}
ReportStack *SymbolizeDataAddr2Line(uptr addr) {
return 0;
}
} // namespace __tsan
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