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[Tolk] AST-based semantic analysis, get rid of Expr

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This is a huge refactoring focusing on untangling compiler internals
(previously forked from FunC).
The goal is to convert AST directly to Op (a kind of IR representation),
doing all code analysis at AST level.

Noteable changes:
- AST-based semantic kernel includes: registering global symbols,
  scope handling and resolving local/global identifiers,
  lvalue/rvalue calc and check, implicit return detection,
  mutability analysis, pure/impure validity checks,
  simple constant folding
- values of `const` variables are calculated NOT based on CodeBlob,
  but via a newly-introduced AST-based constant evaluator
- AST vertices are now inherited from expression/statement/other;
  expression vertices have common properties (TypeExpr, lvalue/rvalue)
- symbol table is rewritten completely, SymDef/SymVal no longer exist,
  lexer now doesn't need to register identifiers
- AST vertices have references to symbols, filled at different
  stages of pipeline
- the remaining "FunC legacy part" is almost unchanged besides Expr
  which was fully dropped; AST is converted to Ops (IR) directly
This commit is contained in:
tolk-vm 2024-12-16 21:19:45 +03:00
parent ea0dc16163
commit 3540424aa1
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GPG key ID: 7905DD7FE0324B12
71 changed files with 4270 additions and 3060 deletions
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20
tolk/ast-stringifier.h
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@ -31,8 +31,9 @@ namespace tolk {
class ASTStringifier final : public ASTVisitor {
constexpr static std::pair<ASTNodeType, const char*> name_pairs[] = {
{ast_empty, "ast_empty"},
{ast_parenthesized_expr, "ast_parenthesized_expr"},
{ast_empty_statement, "ast_empty_statement"},
{ast_empty_expression, "ast_empty_expression"},
{ast_parenthesized_expression, "ast_parenthesized_expression"},
{ast_tensor, "ast_tensor"},
{ast_tensor_square, "ast_tensor_square"},
{ast_identifier, "ast_identifier"},
@ -115,7 +116,7 @@ class ASTStringifier final : public ASTVisitor {
case ast_identifier:
return static_cast<std::string>(v->as<ast_identifier>()->name);
case ast_int_const:
return static_cast<std::string>(v->as<ast_int_const>()->int_val);
return static_cast<std::string>(v->as<ast_int_const>()->orig_str);
case ast_string_const:
if (char modifier = v->as<ast_string_const>()->modifier) {
return "\"" + static_cast<std::string>(v->as<ast_string_const>()->str_val) + "\"" + std::string(1, modifier);
@ -146,21 +147,21 @@ class ASTStringifier final : public ASTVisitor {
return annotation_kinds[static_cast<int>(v->as<ast_annotation>()->kind)].second;
case ast_parameter: {
std::ostringstream os;
os << v->as<ast_parameter>()->param_type;
return static_cast<std::string>(v->as<ast_parameter>()->get_identifier()->name) + ": " + os.str();
os << v->as<ast_parameter>()->declared_type;
return static_cast<std::string>(v->as<ast_parameter>()->param_name) + ": " + os.str();
}
case ast_function_declaration: {
std::string param_names;
for (int i = 0; i < v->as<ast_function_declaration>()->get_num_params(); i++) {
if (!param_names.empty())
param_names += ",";
param_names += v->as<ast_function_declaration>()->get_param(i)->get_identifier()->name;
param_names += v->as<ast_function_declaration>()->get_param(i)->param_name;
}
return "fun " + static_cast<std::string>(v->as<ast_function_declaration>()->get_identifier()->name) + "(" + param_names + ")";
}
case ast_local_var: {
std::ostringstream os;
os << v->as<ast_local_var>()->declared_type;
os << (v->as<ast_local_var>()->inferred_type ? v->as<ast_local_var>()->inferred_type : v->as<ast_local_var>()->declared_type);
if (auto v_ident = v->as<ast_local_var>()->get_identifier()->try_as<ast_identifier>()) {
return static_cast<std::string>(v_ident->name) + ":" + os.str();
}
@ -202,8 +203,9 @@ public:
void visit(AnyV v) override {
switch (v->type) {
case ast_empty: return handle_vertex(v->as<ast_empty>());
case ast_parenthesized_expr: return handle_vertex(v->as<ast_parenthesized_expr>());
case ast_empty_statement: return handle_vertex(v->as<ast_empty_statement>());
case ast_empty_expression: return handle_vertex(v->as<ast_empty_expression>());
case ast_parenthesized_expression: return handle_vertex(v->as<ast_parenthesized_expression>());
case ast_tensor: return handle_vertex(v->as<ast_tensor>());
case ast_tensor_square: return handle_vertex(v->as<ast_tensor_square>());
case ast_identifier: return handle_vertex(v->as<ast_identifier>());