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| //===-- main.cpp ------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <getopt.h>
#include <stdint.h>
#include <stdlib.h>
#if defined(__APPLE__)
#include <LLDB/LLDB.h>
#else
#include "LLDB/SBBlock.h"
#include "LLDB/SBCompileUnit.h"
#include "LLDB/SBDebugger.h"
#include "LLDB/SBFunction.h"
#include "LLDB/SBModule.h"
#include "LLDB/SBProcess.h"
#include "LLDB/SBStream.h"
#include "LLDB/SBSymbol.h"
#include "LLDB/SBTarget.h"
#include "LLDB/SBThread.h"
#endif
#include <string>
using namespace lldb;
// This quick sample code shows how to create a debugger instance and
// create an "i386" executable target. Then we can lookup the executable
// module and resolve a file address into a section offset address,
// and find all symbol context objects (if any) for that address:
// compile unit, function, deepest block, line table entry and the
// symbol.
//
// To build the program, type (while in this directory):
//
// $ make
//
// then (for example):
//
// $ DYLD_FRAMEWORK_PATH=/Volumes/data/lldb/svn/ToT/build/Debug ./a.out
// executable_path file_address
class LLDBSentry {
public:
LLDBSentry() {
// Initialize LLDB
SBDebugger::Initialize();
}
~LLDBSentry() {
// Terminate LLDB
SBDebugger::Terminate();
}
};
static struct option g_long_options[] = {
{"help", no_argument, NULL, 'h'},
{"verbose", no_argument, NULL, 'v'},
{"arch", required_argument, NULL, 'a'},
{"platform", required_argument, NULL, 'p'},
{NULL, 0, NULL, 0}};
#define PROGRAM_NAME "lldb-lookup"
void usage() {
puts("NAME\n"
" " PROGRAM_NAME " -- symbolicate addresses using lldb.\n"
"\n"
"SYNOPSIS\n"
" " PROGRAM_NAME " [[--arch=<ARCH>] [--platform=<PLATFORM>] "
"[--verbose] [--help] --] <PATH> <ADDRESS> "
"[<ADDRESS>....]\n"
"\n"
"DESCRIPTION\n"
" Loads the executable pointed to by <PATH> and looks up and "
"<ADDRESS>\n"
" arguments\n"
"\n"
"EXAMPLE\n"
" " PROGRAM_NAME " --arch=x86_64 -- /usr/lib/dyld 0x100000000\n");
exit(0);
}
int main(int argc, char const *argv[]) {
// Use a sentry object to properly initialize/terminate LLDB.
LLDBSentry sentry;
SBDebugger debugger(SBDebugger::Create());
// Create a debugger instance so we can create a target
if (!debugger.IsValid())
fprintf(stderr, "error: failed to create a debugger object\n");
bool show_usage = false;
bool verbose = false;
const char *arch = NULL;
const char *platform = NULL;
std::string short_options("h?");
for (const struct option *opt = g_long_options; opt->name; ++opt) {
if (isprint(opt->val)) {
short_options.append(1, (char)opt->val);
switch (opt->has_arg) {
case no_argument:
break;
case required_argument:
short_options.append(1, ':');
break;
case optional_argument:
short_options.append(2, ':');
break;
}
}
}
#ifdef __GLIBC__
optind = 0;
#else
optreset = 1;
optind = 1;
#endif
char ch;
while ((ch = getopt_long_only(argc, (char *const *)argv,
short_options.c_str(), g_long_options, 0)) !=
-1) {
switch (ch) {
case 0:
break;
case 'a':
if (arch != NULL) {
fprintf(stderr,
"error: the --arch option can only be specified once\n");
exit(1);
}
arch = optarg;
break;
case 'p':
platform = optarg;
break;
case 'v':
verbose = true;
break;
case 'h':
case '?':
default:
show_usage = true;
break;
}
}
argc -= optind;
argv += optind;
if (show_usage || argc < 2)
usage();
int arg_idx = 0;
// The first argument is the file path we want to look something up in
const char *exe_file_path = argv[arg_idx];
const char *addr_cstr;
const bool add_dependent_libs = false;
SBError error;
SBStream strm;
strm.RedirectToFileHandle(stdout, false);
while ((addr_cstr = argv[++arg_idx]) != NULL) {
// The second argument in the address that we want to lookup
lldb::addr_t file_addr = strtoull(addr_cstr, NULL, 0);
// Create a target using the executable.
SBTarget target = debugger.CreateTarget(exe_file_path, arch, platform,
add_dependent_libs, error);
if (!error.Success()) {
fprintf(stderr, "error: %s\n", error.GetCString());
exit(1);
}
printf("%sLooking up 0x%llx in '%s':\n", (arg_idx > 1) ? "\n" : "",
file_addr, exe_file_path);
if (target.IsValid()) {
// Find the executable module so we can do a lookup inside it
SBFileSpec exe_file_spec(exe_file_path, true);
SBModule module(target.FindModule(exe_file_spec));
// Take a file virtual address and resolve it to a section offset
// address that can be used to do a symbol lookup by address
SBAddress addr = module.ResolveFileAddress(file_addr);
bool success = addr.IsValid() && addr.GetSection().IsValid();
if (success) {
// We can resolve a section offset address in the module
// and only ask for what we need. You can logical or together
// bits from the SymbolContextItem enumeration found in
// lldb-enumeration.h to request only what you want. Here we
// are asking for everything.
//
// NOTE: the less you ask for, the less LLDB will parse as
// LLDB does partial parsing on just about everything.
SBSymbolContext sc(module.ResolveSymbolContextForAddress(
addr, eSymbolContextEverything));
strm.Printf(" Address: %s + 0x%llx\n Summary: ",
addr.GetSection().GetName(), addr.GetOffset());
addr.GetDescription(strm);
strm.Printf("\n");
if (verbose)
sc.GetDescription(strm);
} else {
printf(
"error: 0x%llx does not resolve to a valid file address in '%s'\n",
file_addr, exe_file_path);
}
}
}
return 0;
}
|