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https://github.com/carbon-language/carbon-lang.git
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Dave Abrahams
2205fd52ce
* [executable semantics] class-ify Declaration NFC (no functional change). Proof of concept that we can simplify code by replacing unions with safer, more regular types. Hand-rolled existentials (type-erasing CoW wrappers) are a follow-on step that will further simplify usage. Began adding `const` where possible, and replacing `std::string*` with `std::string`. Most `const`s can disappear as we replace reference semantics with value semantics, but in the meantime it's an important step in the right direction.
46 lines
1.4 KiB
C++
46 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 "executable_semantics/syntax_helpers.h"
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#include <iostream>
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#include "executable_semantics/interpreter/interpreter.h"
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#include "executable_semantics/interpreter/typecheck.h"
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namespace Carbon {
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char* input_filename = nullptr;
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void PrintSyntaxError(char* error, int line_num) {
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std::cerr << input_filename << ":" << line_num << ": " << error << std::endl;
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exit(-1);
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}
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void ExecProgram(std::list<Declaration*>* fs) {
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std::cout << "********** source program **********" << std::endl;
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for (const auto decl : *fs) {
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decl->Print();
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}
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std::cout << "********** type checking **********" << std::endl;
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state = new State(); // Compile-time state.
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std::pair<TypeEnv*, Env*> p = TopLevel(fs);
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TypeEnv* top = p.first;
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Env* ct_top = p.second;
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std::list<const Declaration*> new_decls;
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for (const auto i : *fs) {
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new_decls.push_back(i->TypeChecked(top, ct_top));
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}
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std::cout << std::endl;
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std::cout << "********** type checking complete **********" << std::endl;
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for (const auto decl : new_decls) {
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decl->Print();
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}
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std::cout << "********** starting execution **********" << std::endl;
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int result = InterpProgram(&new_decls);
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std::cout << "result: " << result << std::endl;
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}
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} // namespace Carbon
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