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799e2d1265
FunC's (and Tolk's before this PR) type system is based on Hindley-Milner.
This is a common approach for functional languages, where
types are inferred from usage through unification.
As a result, type declarations are not necessary:
() f(a,b) { return a+b; } // a and b now int, since `+` (int, int)
While this approach works for now, problems arise with the introduction
of new types like bool, where `!x` must handle both int and bool.
It will also become incompatible with int32 and other strict integers.
This will clash with structure methods, struggle with proper generics,
and become entirely impractical for union types.
This PR completely rewrites the type system targeting the future.
1) type of any expression is inferred and never changed
2) this is available because dependent expressions already inferred
3) forall completely removed, generic functions introduced
(they work like template functions actually, instantiated while inferring)
4) instantiation `<...>` syntax, example: `t.tupleAt<int>(0)`
5) `as` keyword, for example `t.tupleAt(0) as int`
6) methods binding is done along with type inferring, not before
("before", as worked previously, was always a wrong approach)
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_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(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_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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