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[Tolk] bool type (-1/0 int under the hood)

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Comparison operators `== / >= /...` return `bool`.
Logical operators `&& ||` return bool.
Constants `true` and `false` have the `bool` type.
Lots of stdlib functions return `bool`, not `int`.

Operator `!x` supports both `int` and `bool`.
Condition of `if` accepts both `int` and `bool`.
Arithmetic operators are restricted to integers.
Logical `&&` and `||` accept both `bool` and `int`.

No arithmetic operations with bools allowed (only bitwise and logical).
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tolk-vm 2025-01-13 15:21:24 +07:00
parent 799e2d1265
commit 974d76c5f6
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33 changed files with 764 additions and 212 deletions
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19
tolk/pipe-constant-folding.cpp
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@ -23,7 +23,8 @@
* This pipe is supposed to do constant folding, like replacing `2 + 3` with `5`.
* It happens after type inferring and validity checks, one of the last ones.
*
* Currently, it just replaces `-1` (ast_unary_operator ast_int_const) with a number -1.
* Currently, it just replaces `-1` (ast_unary_operator ast_int_const) with a number -1
* and `!true` with false.
* More rich constant folding should be done some day, but even without this, IR optimizations
* (operating low-level stack variables) pretty manage to do all related optimizations.
* Constant folding in the future, done at AST level, just would slightly reduce amount of work for optimizer.
@ -39,6 +40,13 @@ class ConstantFoldingReplacer final : public ASTReplacerInFunctionBody {
return v_int;
}
static V<ast_bool_const> create_bool_const(SrcLocation loc, bool bool_val) {
auto v_bool = createV<ast_bool_const>(loc, bool_val);
v_bool->assign_inferred_type(TypeDataBool::create());
v_bool->assign_rvalue_true();
return v_bool;
}
AnyExprV replace(V<ast_unary_operator> v) override {
parent::replace(v);
@ -58,6 +66,15 @@ class ConstantFoldingReplacer final : public ASTReplacerInFunctionBody {
return v->get_rhs();
}
// `!true` / `!false`
if (t == tok_logical_not && v->get_rhs()->type == ast_bool_const) {
return create_bool_const(v->loc, !v->get_rhs()->as<ast_bool_const>()->bool_val);
}
// `!0`
if (t == tok_logical_not && v->get_rhs()->type == ast_int_const) {
return create_bool_const(v->loc, v->get_rhs()->as<ast_int_const>()->intval == 0);
}
return v;
}