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llvm-project/lldb/examples/functions/main.cpp
Chandler Carruth 2946cd7010 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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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 executable target without adding dependent shared
// libraries. It will then set a regular expression breakpoint to get
// breakpoint locations for all functions in the module, and use the
// locations to extract the symbol context for each location. Then it
// dumps all // information about the function: its name, file address
// range, the return type (if any), and all argument types.
//
// To build the program, type (while in this directory):
//
// $ make
//
// then to run this on MacOSX, specify the path to your LLDB.framework
// library using the DYLD_FRAMEWORK_PATH option and run the executable
//
// $ DYLD_FRAMEWORK_PATH=/Volumes/data/lldb/tot/build/Debug ./a.out
// executable_path1 [executable_path2 ...]
//----------------------------------------------------------------------
class LLDBSentry {
public:
LLDBSentry() {
// Initialize LLDB
SBDebugger::Initialize();
}
~LLDBSentry() {
// Terminate LLDB
SBDebugger::Terminate();
}
};
static struct option g_long_options[] = {
{"arch", required_argument, NULL, 'a'},
{"canonical", no_argument, NULL, 'c'},
{"extern", no_argument, NULL, 'x'},
{"help", no_argument, NULL, 'h'},
{"platform", required_argument, NULL, 'p'},
{"verbose", no_argument, NULL, 'v'},
{NULL, 0, NULL, 0}};
#define PROGRAM_NAME "lldb-functions"
void usage() {
puts("NAME\n"
" " PROGRAM_NAME
" -- extract all function signatures from one or more binaries.\n"
"\n"
"SYNOPSIS\n"
" " PROGRAM_NAME " [[--arch=<ARCH>] [--platform=<PLATFORM>] "
"[--verbose] [--help] [--canonical] --] <PATH> "
"[<PATH>....]\n"
"\n"
"DESCRIPTION\n"
" Loads the executable pointed to by <PATH> and dumps complete "
"signatures for all functions that have debug information.\n"
"\n"
"EXAMPLE\n"
" " PROGRAM_NAME " --arch=x86_64 /usr/lib/dyld\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;
bool canonical = false;
bool external_only = 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 'c':
canonical = true;
break;
case 'x':
external_only = true;
break;
case 'p':
platform = optarg;
break;
case 'v':
verbose = true;
break;
case 'h':
case '?':
default:
show_usage = true;
break;
}
}
argc -= optind;
argv += optind;
const bool add_dependent_libs = false;
SBError error;
for (int arg_idx = 0; arg_idx < argc; ++arg_idx) {
// The first argument is the file path we want to look something up in
const char *exe_file_path = argv[arg_idx];
// Create a target using the executable.
SBTarget target = debugger.CreateTarget(exe_file_path, arch, platform,
add_dependent_libs, error);
if (error.Success()) {
if (target.IsValid()) {
SBFileSpec exe_file_spec(exe_file_path, true);
SBModule module(target.FindModule(exe_file_spec));
SBFileSpecList comp_unit_list;
if (module.IsValid()) {
char command[1024];
lldb::SBCommandReturnObject command_result;
snprintf(command, sizeof(command), "add-dsym --uuid %s",
module.GetUUIDString());
debugger.GetCommandInterpreter().HandleCommand(command,
command_result);
if (!command_result.Succeeded()) {
fprintf(stderr, "error: couldn't locate debug symbols for '%s'\n",
exe_file_path);
exit(1);
}
SBFileSpecList module_list;
module_list.Append(exe_file_spec);
SBBreakpoint bp =
target.BreakpointCreateByRegex(".", module_list, comp_unit_list);
const size_t num_locations = bp.GetNumLocations();
for (uint32_t bp_loc_idx = 0; bp_loc_idx < num_locations;
++bp_loc_idx) {
SBBreakpointLocation bp_loc = bp.GetLocationAtIndex(bp_loc_idx);
SBSymbolContext sc(
bp_loc.GetAddress().GetSymbolContext(eSymbolContextEverything));
if (sc.IsValid()) {
if (sc.GetBlock().GetContainingInlinedBlock().IsValid()) {
// Skip inlined functions
continue;
}
SBFunction function(sc.GetFunction());
if (function.IsValid()) {
addr_t lo_pc = function.GetStartAddress().GetFileAddress();
if (lo_pc == LLDB_INVALID_ADDRESS) {
// Skip functions that don't have concrete instances in the
// binary
continue;
}
addr_t hi_pc = function.GetEndAddress().GetFileAddress();
const char *func_demangled_name = function.GetName();
const char *func_mangled_name = function.GetMangledName();
bool dump = true;
const bool is_objc_method = ((func_demangled_name[0] == '-') ||
(func_demangled_name[0] == '+')) &&
(func_demangled_name[1] == '[');
if (external_only) {
// Dump all objective C methods, or external symbols
dump = is_objc_method;
if (!dump)
dump = sc.GetSymbol().IsExternal();
}
if (dump) {
if (verbose) {
printf("\n name: %s\n", func_demangled_name);
if (func_mangled_name)
printf("mangled: %s\n", func_mangled_name);
printf(" range: [0x%16.16llx - 0x%16.16llx)\n type: ",
lo_pc, hi_pc);
} else {
printf("[0x%16.16llx - 0x%16.16llx) ", lo_pc, hi_pc);
}
SBType function_type = function.GetType();
SBType return_type = function_type.GetFunctionReturnType();
if (canonical)
return_type = return_type.GetCanonicalType();
if (func_mangled_name && func_mangled_name[0] == '_' &&
func_mangled_name[1] == 'Z') {
printf("%s %s\n", return_type.GetName(),
func_demangled_name);
} else {
SBTypeList function_args =
function_type.GetFunctionArgumentTypes();
const size_t num_function_args = function_args.GetSize();
if (is_objc_method) {
const char *class_name_start = func_demangled_name + 2;
if (num_function_args == 0) {
printf("%c(%s)[%s\n", func_demangled_name[0],
return_type.GetName(), class_name_start);
} else {
const char *class_name_end =
strchr(class_name_start, ' ');
const int class_name_len =
class_name_end - class_name_start;
printf("%c(%s)[%*.*s", func_demangled_name[0],
return_type.GetName(), class_name_len,
class_name_len, class_name_start);
const char *selector_pos = class_name_end + 1;
for (uint32_t function_arg_idx = 0;
function_arg_idx < num_function_args;
++function_arg_idx) {
const char *selector_end =
strchr(selector_pos, ':') + 1;
const int selector_len = selector_end - selector_pos;
SBType function_arg_type =
function_args.GetTypeAtIndex(function_arg_idx);
if (canonical)
function_arg_type =
function_arg_type.GetCanonicalType();
printf(" %*.*s", selector_len, selector_len,
selector_pos);
if (function_arg_type.IsValid()) {
printf("(%s)", function_arg_type.GetName());
} else {
printf("(?)");
}
selector_pos = selector_end;
}
printf("]\n");
}
} else {
printf("%s ", return_type.GetName());
if (strchr(func_demangled_name, '('))
printf("(*)(");
else
printf("%s(", func_demangled_name);
for (uint32_t function_arg_idx = 0;
function_arg_idx < num_function_args;
++function_arg_idx) {
SBType function_arg_type =
function_args.GetTypeAtIndex(function_arg_idx);
if (canonical)
function_arg_type =
function_arg_type.GetCanonicalType();
if (function_arg_type.IsValid()) {
printf("%s%s", function_arg_idx > 0 ? ", " : "",
function_arg_type.GetName());
} else {
printf("%s???", function_arg_idx > 0 ? ", " : "");
}
}
printf(")\n");
}
}
}
}
}
}
}
}
} else {
fprintf(stderr, "error: %s\n", error.GetCString());
exit(1);
}
}
return 0;
}
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