external/ton
1
0
Fork 0
mirror of https://github.com/ton-blockchain/ton synced 2025-03-09 15:40:10 +00:00
Code Issues Releases Wiki Activity

[Tolk] Rewrite the type system from Hindley-Milner to static typing

Browse source 
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)
This commit is contained in:
tolk-vm 2024-12-30 22:31:27 +07:00
parent 3540424aa1
commit 799e2d1265
No known key found for this signature in database
GPG key ID: 7905DD7FE0324B12
101 changed files with 5402 additions and 2713 deletions
Download patch file Download diff file Expand all files Collapse all files

19
tolk/pipe-generate-fif-output.cpp
View file

@ -40,20 +40,15 @@ void FunctionBodyAsm::set_code(std::vector<AsmOp>&& code) {
static void generate_output_func(const FunctionData* fun_ref) {
tolk_assert(fun_ref->is_regular_function());
tolk_assert(fun_ref->is_code_function());
if (G.is_verbosity(2)) {
std::cerr << "\n\n=========================\nfunction " << fun_ref->name << " : " << fun_ref->full_type << std::endl;
std::cerr << "\n\n=========================\nfunction " << fun_ref->name << " : " << fun_ref->inferred_return_type << std::endl;
}
CodeBlob* code = std::get<FunctionBodyCode*>(fun_ref->body)->code;
if (G.is_verbosity(3)) {
code->print(std::cerr, 9);
}
code->simplify_var_types();
if (G.is_verbosity(5)) {
std::cerr << "after simplify_var_types: \n";
code->print(std::cerr, 0);
}
code->prune_unreachable_code();
if (G.is_verbosity(5)) {
std::cerr << "after prune_unreachable: \n";
@ -112,11 +107,11 @@ static void generate_output_func(const FunctionData* fun_ref) {
}
}
void pipeline_generate_fif_output_to_std_cout(const AllSrcFiles& all_src_files) {
void pipeline_generate_fif_output_to_std_cout() {
std::cout << "\"Asm.fif\" include\n";
std::cout << "// automatically generated from ";
bool need_comma = false;
for (const SrcFile* file : all_src_files) {
for (const SrcFile* file : G.all_src_files) {
if (!file->is_stdlib_file()) {
if (need_comma) {
std::cout << ", ";
@ -129,9 +124,9 @@ void pipeline_generate_fif_output_to_std_cout(const AllSrcFiles& all_src_files)
std::cout << "PROGRAM{\n";
bool has_main_procedure = false;
for (const FunctionData* fun_ref : G.all_code_functions) {
for (const FunctionData* fun_ref : G.all_functions) {
if (!fun_ref->does_need_codegen()) {
if (G.is_verbosity(2)) {
if (G.is_verbosity(2) && fun_ref->is_code_function()) {
std::cerr << fun_ref->name << ": code not generated, function does not need codegen\n";
}
continue;
@ -164,7 +159,7 @@ void pipeline_generate_fif_output_to_std_cout(const AllSrcFiles& all_src_files)
std::cout << std::string(2, ' ') << "DECLGLOBVAR " << var_ref->name << "\n";
}
for (const FunctionData* fun_ref : G.all_code_functions) {
for (const FunctionData* fun_ref : G.all_functions) {
if (!fun_ref->does_need_codegen()) {
continue;
}