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https://github.com/ton-blockchain/ton
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3540424aa1
This is a huge refactoring focusing on untangling compiler internals (previously forked from FunC). The goal is to convert AST directly to Op (a kind of IR representation), doing all code analysis at AST level. Noteable changes: - AST-based semantic kernel includes: registering global symbols, scope handling and resolving local/global identifiers, lvalue/rvalue calc and check, implicit return detection, mutability analysis, pure/impure validity checks, simple constant folding - values of `const` variables are calculated NOT based on CodeBlob, but via a newly-introduced AST-based constant evaluator - AST vertices are now inherited from expression/statement/other; expression vertices have common properties (TypeExpr, lvalue/rvalue) - symbol table is rewritten completely, SymDef/SymVal no longer exist, lexer now doesn't need to register identifiers - AST vertices have references to symbols, filled at different stages of pipeline - the remaining "FunC legacy part" is almost unchanged besides Expr which was fully dropped; AST is converted to Ops (IR) directly
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
/*
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This file is part of TON Blockchain source code.
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TON Blockchain is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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TON Blockchain is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with TON Blockchain. If not, see <http://www.gnu.org/licenses/>.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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You must obey the GNU General Public License in all respects for all
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of the code used other than OpenSSL. If you modify file(s) with this
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exception, you may extend this exception to your version of the file(s),
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but you are not obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. If you delete this exception statement
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from all source files in the program, then also delete it here.
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*/
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#include "tolk.h"
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#include "compiler-state.h"
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/*
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* This pipe finds unused symbols (global functions and variables) to strip them off codegen.
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* It happens after converting AST to Op, so it does not traverse AST.
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* In the future, when control flow graph is introduced, this should be done at AST level.
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*/
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namespace tolk {
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static void mark_function_used_dfs(const std::unique_ptr<Op>& op);
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static void mark_function_used(const FunctionData* fun_ref) {
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if (!fun_ref->is_regular_function() || fun_ref->is_really_used()) { // already handled
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return;
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}
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fun_ref->mutate()->assign_is_really_used();
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mark_function_used_dfs(std::get<FunctionBodyCode*>(fun_ref->body)->code->ops);
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}
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static void mark_global_var_used(const GlobalVarData* glob_ref) {
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glob_ref->mutate()->assign_is_really_used();
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}
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static void mark_function_used_dfs(const std::unique_ptr<Op>& op) {
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if (!op) {
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return;
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}
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if (op->f_sym) { // for Op::_Call
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mark_function_used(op->f_sym);
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}
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if (op->g_sym) { // for Op::_GlobVar
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mark_global_var_used(op->g_sym);
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}
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mark_function_used_dfs(op->next);
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mark_function_used_dfs(op->block0);
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mark_function_used_dfs(op->block1);
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}
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void pipeline_find_unused_symbols() {
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for (const FunctionData* fun_ref : G.all_code_functions) {
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if (fun_ref->is_method_id_not_empty()) { // get methods, main and other entrypoints, regular functions with @method_id
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mark_function_used(fun_ref);
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}
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}
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}
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} // namespace tolk
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