mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 08:10:10 +01:00
Chandler Carruth
6542506cdc
This allows it to find the prelude when run out of a Bazel runfiles tree regardless of the current working directory. For example, this will allow local testing of compiler explorer.
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include <unistd.h>
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#include <cstdio>
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#include <cstring>
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#include <iostream>
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#include <string>
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#include <vector>
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#include "common/error.h"
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#include "executable_semantics/common/arena.h"
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#include "executable_semantics/common/nonnull.h"
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#include "executable_semantics/interpreter/exec_program.h"
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#include "executable_semantics/syntax/parse.h"
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#include "executable_semantics/syntax/prelude.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Program.h"
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// Prints an error message and returns error code value.
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auto PrintError(const Carbon::Error& error) -> int {
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llvm::errs() << error.message() << "\n";
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return EXIT_FAILURE;
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}
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auto main(int argc, char* argv[]) -> int {
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llvm::setBugReportMsg(
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"Please report issues to "
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"https://github.com/carbon-language/carbon-lang/issues and include the "
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"crash backtrace.\n");
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llvm::InitLLVM init_llvm(argc, argv);
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// Printing to stderr should flush stdout. This is most noticeable when stderr
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// is piped to stdout.
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llvm::errs().tie(&llvm::outs());
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using llvm::cl::desc;
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using llvm::cl::opt;
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opt<bool> trace_option("trace", desc("Enable tracing"));
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opt<std::string> input_file_name(llvm::cl::Positional, desc("<input file>"),
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llvm::cl::Required);
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// Find the path of the executable if possible and use that as a relative root
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// for finding the prelude. FIXME: Currently, this assumes a Bazel-like
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// runfiles tree rather than any kind of installation tree.
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llvm::SmallString<256> exe_path(argv[0]);
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if (!llvm::sys::fs::exists(exe_path)) {
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// Try to lookup the program name in the `PATH`.
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if (llvm::ErrorOr<std::string> path =
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llvm::sys::findProgramByName(exe_path)) {
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exe_path = *path;
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}
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}
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// If we have a valid path, find the parent directory. Otherwise, just use an
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// empty string to get the current working directory.
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if (llvm::sys::fs::exists(exe_path)) {
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llvm::sys::path::remove_filename(exe_path);
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} else {
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exe_path = "";
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}
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llvm::SmallString<256> prelude_path = exe_path;
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llvm::sys::path::append(prelude_path, "data/prelude.carbon");
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opt<std::string> prelude_file_name("prelude", desc("<prelude file>"),
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llvm::cl::init(prelude_path.str().str()));
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llvm::cl::ParseCommandLineOptions(argc, argv);
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Carbon::Arena arena;
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Carbon::ErrorOr<Carbon::AST> ast =
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Carbon::Parse(&arena, input_file_name, trace_option);
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if (!ast.ok()) {
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return PrintError(ast.error());
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}
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AddPrelude(prelude_file_name, &arena, &ast->declarations);
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// Typecheck and run the parsed program.
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Carbon::ErrorOr<int> result = Carbon::ExecProgram(&arena, *ast, trace_option);
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if (!result.ok()) {
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return PrintError(result.error());
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}
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}
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