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https://github.com/carbon-language/carbon-lang.git
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Jon Meow
ff319d311a
The advantage is a C++ pointer is special, and this approach eliminates the Ptr class type that was causing problems in conversions. Attribute suggestion was courtesy of chandlerc. We're sticking with the Ptr name because it's shorter than Nonnull, and we're likely to keep this in lots of places.
45 lines
1.4 KiB
C++
45 lines
1.4 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 <cstdio>
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#include <cstring>
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#include <iostream>
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#include "executable_semantics/common/tracing_flag.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 "llvm/Support/CommandLine.h"
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#include "llvm/Support/InitLLVM.h"
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int main(int argc, char* argv[]) {
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llvm::InitLLVM(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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llvm::cl::ParseCommandLineOptions(argc, argv);
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if (trace_option) {
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Carbon::tracing_output = true;
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}
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Carbon::Arena arena;
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std::variant<Carbon::AST, Carbon::SyntaxErrorCode> ast_or_error =
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Carbon::Parse(&arena, input_file_name);
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if (auto* error = std::get_if<Carbon::SyntaxErrorCode>(&ast_or_error)) {
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// Diagnostic already reported to std::cerr; this is just a return code.
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return *error;
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}
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// Typecheck and run the parsed program.
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Carbon::ExecProgram(&arena, std::get<Carbon::AST>(ast_or_error));
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}
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