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cppfront.cpp
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180 lines (154 loc) · 5.7 KB
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// Copyright 2022-2026 Herb Sutter
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// Part of the Cppfront Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://github.com/hsutter/cppfront/blob/main/LICENSE for license information.
//===========================================================================
// main - driver
//===========================================================================
#include "to_cpp1.h"
static auto flag_debug_output = false;
static cpp2::cmdline_processor::register_flag cmd_debug(
9,
"debug",
"Emit compiler debug output",
[]{ flag_debug_output = true; }
);
static auto flag_quiet = false;
static cpp2::cmdline_processor::register_flag cmd_quiet(
9,
"quiet",
"Print only error output",
[]{ flag_quiet = true; }
);
auto main(
int argc,
char* argv[]
)
-> int
{
using namespace cpp2;
cmdline.set_args(argc, argv);
cmdline.process_flags();
if (cmdline.help_was_requested()) {
return EXIT_SUCCESS;
}
if (cmdline.arguments().empty()) {
std::cerr << "cppfront: error: no input files (try -help)\n";
return EXIT_FAILURE;
}
if (std::filesystem::exists(flag_cwd)) {
std::filesystem::current_path(flag_cwd);
}
// For each Cpp2 source file
int exit_status = EXIT_SUCCESS;
for (auto const& arg : cmdline.arguments())
{
if (
arg.text.starts_with("-")
|| (arg.text.starts_with("/") && !contains(arg.text, '.'))
)
{
auto ambiguous = cmdline.flags_starting_with(arg.text.substr(1));
if (ambiguous.empty()) {
std::cerr << arg.text << " - unknown compiler flag name (try " << arg.text.front() << "help)\n";
}
else {
std::cerr << arg.text << " - ambiguous compiler flag name, did you mean one of these?\n";
for (auto const& a : ambiguous) {
std::cerr << " " << arg.text.front() << a << "\n";
}
}
return EXIT_FAILURE;
}
cpp2::timer t;
t.start();
auto& out = flag_cpp1_filename != "stdout" ? std::cout : std::cerr;
if (
!flag_quiet
&& arg.text != "stdin"
&& flag_cpp1_filename != "stdout"
)
{
out << arg.text << "...";
}
// Load + lex + parse + sema
cppfront c(arg.text);
// Generate Cpp1 (this may catch additional late errors)
auto count = c.lower_to_cpp1();
// If there were no errors, say so and generate Cpp1
if (c.had_no_errors())
{
if (
!flag_quiet
&& flag_cpp1_filename != "stdout"
)
{
if (!c.has_cpp1()) {
out << " ok (all Cpp2, passes safety checks)\n";
}
else if (c.has_cpp2()) {
out << " ok (mixed Cpp1/Cpp2, Cpp2 code passes safety checks)\n";
}
else {
out << " ok (all Cpp1)\n";
}
if (flag_verbose) {
auto total = count.cpp1_lines + count.cpp2_lines;
auto total_lines = print_with_thousands(total);
out << " Cpp1 "
<< std::right << std::setw(unchecked_narrow<int>(total_lines.size()))
<< print_with_thousands(count.cpp1_lines) << " line" << (count.cpp1_lines != 1 ? "s" : "");
out << "\n Cpp2 "
<< std::right << std::setw(unchecked_narrow<int>(total_lines.size()))
<< print_with_thousands(count.cpp2_lines) << " line" << (count.cpp2_lines != 1 ? "s" : "");
if (total > 0) {
out << " (";
if (count.cpp1_lines == 0) {
out << 100;
}
else if (count.cpp2_lines / count.cpp1_lines > 25) {
out << std::setprecision(3)
<< 100.0 * count.cpp2_lines / total;
}
else {
out << 100 * count.cpp2_lines / total;
}
out << "%)";
}
t.stop();
auto total_time = print_with_thousands(t.elapsed().count());
std::cout << "\n Time " << total_time << " ms";
std::multimap< long long, std::string_view, std::greater<> > sorted_timers;
for (auto [name, t] : timers) {
sorted_timers.insert({t.elapsed().count(), name});
}
for (auto [elapsed, name] : sorted_timers) {
std::cout
<< "\n "
<< std::right << std::setw(unchecked_narrow<int>(total_time.size()))
<< print_with_thousands(elapsed) << " ms" << " in " << name;
}
}
out << "\n";
}
}
// Otherwise, print the errors
else
{
std::cerr << "\n";
c.print_errors();
std::cerr << "\n";
exit_status = EXIT_FAILURE;
}
// And, if requested, the debug information
if (flag_debug_output) {
c.debug_print();
}
}
//if (flag_internal_debug) {
// stackinstr::print_deepest();
// stackinstr::print_largest();
//}
return exit_status;
}