mirror of
https://github.com/ton-blockchain/ton
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f3e620f48c
This commit introduces nullable types `T?` that are distinct from non-nullable `T`. Example: `int?` (int or null) and `int` are different now. Previously, `null` could be assigned to any primitive type. Now, it can be assigned only to `T?`. A non-null assertion operator `!` was also introduced, similar to `!` in TypeScript and `!!` in Kotlin. If `int?` still occupies 1 stack slot, `(int,int)?` and other nullable tensors occupy N+1 slots, the last for "null precedence". `v == null` actually compares that slot. Assigning `(int,int)` to `(int,int)?` implicitly creates a null presence slot. Assigning `null` to `(int,int)?` widens this null value to 3 slots. This is called "type transitioning". All stdlib functions prototypes have been updated to reflect whether they return/accept a nullable or a strict value. This commit also contains refactoring from `const FunctionData*` to `FunctionPtr` and similar.
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(FunctionPtr fun_ref) {
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if (!fun_ref->is_code_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(GlobalVarPtr 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 (FunctionPtr fun_ref : G.all_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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