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https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
e324935139
- Give unary `-` and `not` the same precedence as in C++ - Add detail to parse error messages, and make the --trace flag also enable parser debug tracing - Make any new shift-reduce conflicts into build errors - Use `%precedence` rather than `%nonassoc` where possible, in order to catch more grammar bugs at build time
37 lines
1.2 KiB
C++
37 lines
1.2 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/syntax/parse.h"
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#include "executable_semantics/syntax/syntax_helpers.h"
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#include "executable_semantics/tracing_flag.h"
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#include "llvm/Support/CommandLine.h"
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int main(int argc, char* argv[]) {
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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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std::variant<Carbon::AST, Carbon::SyntaxErrorCode> ast_or_error =
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Carbon::parse(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(std::get<Carbon::AST>(ast_or_error));
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}
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