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https://github.com/ton-blockchain/ton
synced 2025-02-13 03:32:22 +00:00
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)
192 lines
4 KiB
Text
192 lines
4 KiB
Text
fun foo(x: int): int {
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try {
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if (x == 7) {
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throw 44;
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}
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return x;
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} catch {
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return 2;
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}
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}
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@inline
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fun foo_inline(x: int): int {
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try {
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assert(!(x == 7)) throw 44;
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return x;
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} catch {
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return 2;
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}
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}
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@inline_ref
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fun foo_inlineref(x: int): int {
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try {
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if (x == 7) { throw (44, 2); }
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return x;
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} catch (_, arg) {
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return arg as int;
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}
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}
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@method_id(101)
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fun test(x: int, y: int, z: int): int {
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y = foo(y);
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return x * 100 + y * 10 + z;
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}
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@method_id(102)
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fun test_inline(x: int, y: int, z: int): int {
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y = foo_inline(y);
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return x * 100 + y * 10 + z;
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}
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@method_id(103)
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fun test_inlineref(x: int, y: int, z: int): int {
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y = foo_inlineref(y);
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return x * 100 + y * 10 + z;
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}
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@inline
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fun foo_inline_big(
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x1: int, x2: int, x3: int, x4: int, x5: int, x6: int, x7: int, x8: int, x9: int, x10: int,
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x11: int, x12: int, x13: int, x14: int, x15: int, x16: int, x17: int, x18: int, x19: int, x20: int
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): int {
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try {
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if (x1 == 7) {
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throw 44;
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}
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return x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8 + x9 + x10 + x11 + x12 + x13 + x14 + x15 + x16 + x17 + x18 + x19 + x20;
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} catch {
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return 1;
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}
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}
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@method_id(104)
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fun test_inline_big(x: int, y: int, z: int): int {
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y = foo_inline_big(
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y, y + 1, y + 2, y + 3, y + 4, y + 5, y + 6, y + 7, y + 8, y + 9,
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y + 10, y + 11, y + 12, y + 13, y + 14, y + 15, y + 16, y + 17, y + 18, y + 19);
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return x * 1000000 + y * 1000 + z;
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}
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fun foo_big(
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x1: int, x2: int, x3: int, x4: int, x5: int, x6: int, x7: int, x8: int, x9: int, x10: int,
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x11: int, x12: int, x13: int, x14: int, x15: int, x16: int, x17: int, x18: int, x19: int, x20: int
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): int {
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try {
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if (x1 == 7) {
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throw (44, 1);
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}
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return x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8 + x9 + x10 + x11 + x12 + x13 + x14 + x15 + x16 + x17 + x18 + x19 + x20;
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} catch (code, arg) {
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return arg as int;
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}
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}
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@method_id(105)
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fun test_big(x: int, y: int, z: int): int {
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y = foo_big(
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y, y + 1, y + 2, y + 3, y + 4, y + 5, y + 6, y + 7, y + 8, y + 9,
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y + 10, y + 11, y + 12, y + 13, y + 14, y + 15, y + 16, y + 17, y + 18, y + 19);
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return x * 1000000 + y * 1000 + z;
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}
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@method_id(106)
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fun test_catch_into_same(x: int): int {
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var code = x;
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try {
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assert(x <= 10, 44);
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} catch(code) {
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return code;
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}
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return code;
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}
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@method_id(107)
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fun test_catch_into_same_2(x: int): int {
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var code = x;
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try {
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if (x > 10) {
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throw 44;
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}
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} catch(code) {
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}
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return code;
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}
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global after046: int;
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// this bug existed in FunC and is fixed in v0.4.6
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fun bug_046_internal(op: int) {
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if (op == 1) {
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return;
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} else if (op == 2) {
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return;
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} else {
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throw 1;
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}
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}
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fun bug_046_called() {
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after046 = 0;
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try {
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bug_046_internal(1337);
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after046 = 1; // shouldn't be called
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} catch(n) {
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return;
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}
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return;
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}
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@method_id(108)
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fun bug_046_entrypoint() {
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bug_046_called();
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return after046;
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}
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global g_reg: int;
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@method_id(109)
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fun test109(): (int, int) {
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var l_reg = 10;
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g_reg = 10;
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try {
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// note, that regardless of assignment, an exception RESTORES them to previous (to 10)
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// it's very unexpected, but is considered to be a TVM feature, not a bug
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g_reg = 999;
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l_reg = 999;
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bug_046_internal(999); // throws
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} catch {
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}
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// returns (10,10) because of an exception, see a comment above
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return (g_reg, l_reg);
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}
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fun main() {
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}
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/**
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method_id | in | out
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@testcase | 101 | 1 2 3 | 123
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@testcase | 101 | 3 8 9 | 389
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@testcase | 101 | 3 7 9 | 329
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@testcase | 102 | 1 2 3 | 123
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@testcase | 102 | 3 8 9 | 389
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@testcase | 102 | 3 7 9 | 329
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@testcase | 103 | 1 2 3 | 123
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@testcase | 103 | 3 8 9 | 389
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@testcase | 103 | 3 7 9 | 329
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@testcase | 104 | 4 8 9 | 4350009
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@testcase | 104 | 4 7 9 | 4001009
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@testcase | 105 | 4 8 9 | 4350009
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@testcase | 105 | 4 7 9 | 4001009
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@testcase | 106 | 5 | 5
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@testcase | 106 | 20 | 44
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@testcase | 107 | 5 | 5
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@testcase | 107 | 20 | 20
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@testcase | 108 | | 0
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@code_hash 39307974281105539319288356721945232226028429128341177951717392648324358675585
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*/
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