speedcat/src/type_checker.odin
Slendi 2e38b9dabc Make the type checker recognize enum definitions
This patch makes it such that if you define an enum inside of a scope,
the type checker will remember it. There is currently no support for
field accesses.

Signed-off-by: Slendi <slendi@socopon.com>
2024-04-30 10:46:00 +03:00

829 lines
22 KiB
Odin

package main
import "core:fmt"
import "core:strconv"
StructField :: struct {
name: [dynamic]u8,
type: ^Type,
default_value: ^Node,
}
struct_field_create :: proc() -> ^StructField {
return new(StructField)
}
Struct :: struct {
fields: [dynamic]^StructField,
}
struct_create :: proc() -> ^Struct {
s := new(Struct)
s.fields = [dynamic]^StructField{}
return s
}
struct_find_field :: proc(s: ^Struct, name: [dynamic]u8) -> ^StructField {
name_ := name
for field in s.fields {
if compare_dyn_arrs(&field.name, &name_) {
return field
}
}
return nil
}
Scope :: struct {
function_definitions: map[int]^FunctionType, // A map to nodes which are the function definitions
variable_definitions: map[int]^Type, // A map to types
variable_mutability_definitions: map[int]bool, // A map to a variable's mutability
function_return_type: ^Type,
structure_definitions: map[int]^Struct,
enum_definitions: map[int]^EnumValue,
}
find_struct :: proc(name: [dynamic]u8) -> ^Struct {
name_ := name
#reverse for &scope in scope_stack {
struct_, ok := scope.structure_definitions[get_character_sum_of_dyn_arr(&name_)]
if ok {
return struct_
}
}
return nil
}
@(private = "file")
infer_type :: proc(parent: ^Node, child: ^Node) {
if child.return_type == nil {
#partial switch child.kind {
case .Integer:
child.return_type = type_create_integer(32, true)
case .Float:
child.return_type = type_create_float(32)
case .String:
child.return_type = type_create_array(type_create_integer(8, false), 0)
case .Character:
child.return_type = type_create_integer(32, false)
}
} else {
if parent != nil {
parent.return_type = child.return_type
}
}
}
@(private = "file")
is_number :: proc(node: ^Node) -> bool {
return node.kind == .Integer || node.kind == .Float
}
@(private = "file")
ast_to_type :: proc(node: ^Node) -> ^Type {
if node == nil {
return type_create_integer(0, false)
}
if node.kind == .Identifier {
value := node.value.([dynamic]u8)
if value[0] == 'u' {
bit_size, ok := strconv.parse_u64_of_base(string(value[1:]), 10)
if !ok {
fmt.panicf("Failed to parse integer: %s", value)
}
return type_create_integer(u8(bit_size), false)
} else if value[0] == 'i' {
bit_size, ok := strconv.parse_u64_of_base(string(value[1:]), 10)
if !ok {
fmt.panicf("Failed to parse integer: %s", value)
}
return type_create_integer(u8(bit_size), true)
} else if value[0] == 'f' {
bit_size, ok := strconv.parse_u64_of_base(string(value[1:]), 10)
if !ok {
fmt.panicf("Failed to parse integer: %s", value)
}
return type_create_float(u8(bit_size))
} else {
res := scope_struct_lookup(value)
if res != nil {
return type_create_struct(value)
}
append(&g_message_list, message_create(.Error, fmt.aprintf("Unknown type: %s", value), node.range))
return nil
}
} else if node.kind == .Pointer {
return type_create_pointer(ast_to_type(node.children[0]))
} else if node.kind == .Array {
return type_create_array(ast_to_type(node.children[0]), node.value.(u64))
} else {
fmt.panicf("Unhandled node kind in ast_to_type: {}", node.kind)
}
}
scope_stack := [dynamic]Scope{}
scope_enter :: proc() {
append(&scope_stack, Scope{})
scope_stack[len(scope_stack) - 1].function_definitions = make(map[int]^FunctionType)
scope_stack[len(scope_stack) - 1].variable_definitions = make(map[int]^Type)
scope_stack[len(scope_stack) - 1].variable_mutability_definitions = make(map[int]bool)
scope_stack[len(scope_stack) - 1].function_return_type = nil
}
scope_leave :: proc() {
if len(scope_stack) == 0 {
fmt.panicf("Tried to leave scope when there are no scopes")
}
delete(scope_stack[len(scope_stack) - 1].function_definitions)
delete(scope_stack[len(scope_stack) - 1].variable_definitions)
pop(&scope_stack)
}
scope_variable_lookup :: proc(name: [dynamic]u8) -> ^Type {
name_ := name
#reverse for &scope in scope_stack {
type, ok := scope.variable_definitions[get_character_sum_of_dyn_arr(&name_)]
if ok {
return type
}
}
return nil
}
scope_variable_lookup_mutable :: proc(name: [dynamic]u8) -> bool {
name_ := name
#reverse for &scope in scope_stack {
type, ok := scope.variable_mutability_definitions[get_character_sum_of_dyn_arr(&name_)]
if ok {
return type
}
}
return false
}
scope_function_lookup :: proc(name: [dynamic]u8) -> ^FunctionType {
name_ := name
#reverse for &scope in scope_stack {
type, ok := scope.function_definitions[get_character_sum_of_dyn_arr(&name_)]
if ok {
return type
}
}
return nil
}
scope_struct_lookup :: proc(name: [dynamic]u8) -> ^Struct {
name_ := name
#reverse for &scope in scope_stack {
struct_, ok := scope.structure_definitions[get_character_sum_of_dyn_arr(&name_)]
if ok {
return struct_
}
}
return nil
}
scope_function_return_type_lookup :: proc() -> ^Type {
#reverse for &scope in scope_stack {
if scope.function_return_type != nil {
return scope.function_return_type
}
}
return nil
}
type_check_function_call :: proc(ast: ^Node, parent_ast: ^Node, must_be_function := true) -> ^FunctionType {
name: [dynamic]u8
if ast.kind == .FunctionCall {
name = ast.children[0].value.([dynamic]u8)
} else {
name = ast.value.([dynamic]u8)
}
fn := scope_function_lookup(name)
if fn == nil {
if must_be_function {
append(&g_message_list, message_create(.Error, fmt.aprintf("Undefined function: %s", name), ast.range))
}
return nil
}
return fn
}
type_check :: proc(ast: ^Node, parent_ast: ^Node) {
in_extern := false
if ast == nil {
return
}
#partial switch (ast.kind) {
case .Integer:
fallthrough
case .Float:
fallthrough
case .String:
infer_type(parent_ast, ast)
case .Block:
scope_enter()
functions := find_function_definitions(ast)
for fn, i in functions {
scope_stack[len(scope_stack) - 1].function_definitions[get_character_sum_of_dyn_arr(&fn.name)] = fn
}
for child in ast.children {
type_check(child, ast)
}
scope_leave()
case .FieldAccess:
lhs := ast.children[0]
rhs := ast.children[1]
// FIXME: Add support for nesting
struct_: ^Struct
if lhs.kind != .FieldAccess {
struct_var := scope_variable_lookup(lhs.value.([dynamic]u8))
if struct_var == nil {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Cannot find struct of name: `%s`", lhs.value.([dynamic]u8)),
lhs.range,
),
)
break
}
struct_ = scope_struct_lookup(struct_var.struct_type.name)
if struct_ == nil {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Cannot find struct of type name: `%s`", lhs.value.([dynamic]u8)),
lhs.range,
),
)
break
}
}
if rhs.kind != .Identifier {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Field access rhs is not an identifier or field access: {}", rhs.kind),
rhs.range,
),
)
break
}
if lhs.kind == .FieldAccess {
type_check(lhs, ast)
if lhs.return_type.kind != .Struct {
append(&g_message_list, message_create(.Error, fmt.aprintf("LHS is not a Struct type"), lhs.range))
}
struct_ = scope_struct_lookup(lhs.return_type.struct_type.name)
if struct_ == nil {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Cannot find struct of type name: `%s`", lhs.value.([dynamic]u8)),
lhs.range,
),
)
break
}
} else if lhs.kind != .Identifier {
append(
&g_message_list,
message_create(.Error, fmt.aprintf("Field access lhs is not an identifier or FieldAccess"), lhs.range),
)
break
}
struct_index: u64 = 0
found_field := false
for &field, i in struct_.fields {
if compare_dyn_arrs(&field.name, &rhs.value.([dynamic]u8)) {
ast.return_type = field.type
found_field = true
struct_index = u64(i)
break
}
}
if !found_field {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Cannot find field of name: `%s`", rhs.value.([dynamic]u8)),
rhs.range,
),
)
break
}
ast.return_type.struct_index = struct_index
case .FunctionCall:
if ast.children[0].kind == .FieldAccess {
// FIXME: This is some temporary shitfuckery, check if a function is part
// of a struct or namespace first, then do this shit
type_check(ast.children[0], ast)
child := ast.children[0]^
free(ast.children[0])
clear(&ast.children)
ast^ = child
return
}
type := scope_variable_lookup(ast.children[0].value.([dynamic]u8))
if type != nil {
name := ast.children[0].value.([dynamic]u8)
free(ast.children[0])
clear(&ast.children)
ast.return_type = type
ast.kind = .Identifier
ast.value = name
type_check(ast, parent_ast)
} else {
fn := type_check_function_call(ast, parent_ast)
if fn != nil {
if len(fn.parameter_types) != len(ast.children) - 1 {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf(
"Function call parameter count mismatch for function `%s`: {} and {}",
fn.name,
len(fn.parameter_types),
len(ast.children) - 1,
),
ast.range,
),
)
break
}
for param, i in fn.parameter_types {
type_check(ast.children[i + 1], ast)
ok, cast_required := compare_types(param, ast.children[i + 1].return_type)
if cast_required {
cast_ := node_create_cast({}, ast.children[i + 1], nil)
cast_.return_type = param
ast.children[i + 1] = cast_
}
if !ok {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf(
"Type mismatch in function call for `%s`: Wanted {}, got {}",
fn.name,
type_to_string(param),
type_to_string(ast.children[i + 1].return_type),
),
ast.range,
),
)
}
}
ast.return_type = fn.return_type
}
}
case .Identifier:
type := scope_variable_lookup(ast.value.([dynamic]u8))
if type == nil {
fn := type_check_function_call(ast, parent_ast, false)
if fn == nil {
append(&g_message_list, message_create(.Warning, "Variable name treated as string", ast.range))
ast.kind = .String
append(&ast.value.([dynamic]u8), 0)
type_check(ast, parent_ast)
} else {
ast.kind = .FunctionCall
append(&ast.children, node_create_value(.Identifier, ast.range, ast.value))
ast.return_type = fn.return_type
ast.value = nil
}
} else {
ast.return_type = type
}
case .BinaryExpression:
type_check(ast.children[0], ast)
type_check(ast.children[1], ast)
ok, cast_required := compare_types(ast.children[0].return_type, ast.children[1].return_type)
if cast_required {
cast_ := node_create_cast(ast.children[1].range, ast.children[1], nil)
cast_.return_type = ast.children[0].return_type
ast.children[1] = cast_
}
if !ok {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf(
"Type mismatch: {} and {}",
type_to_string(ast.children[0].return_type),
type_to_string(ast.children[1].return_type),
),
ast.range,
),
)
}
ast.return_type = ast.children[1].return_type
if ast.value_token_kind == .Assign {
if ast.children[0].kind != .Identifier && ast.children[0].kind != .FieldAccess {
append(&g_message_list, message_create(.Error, fmt.aprintf("LHS of assignment is invalid"), ast.range))
}
if !scope_variable_lookup_mutable(ast.children[0].value.([dynamic]u8)) {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Variable is not mutable: %s", ast.children[0].value.([dynamic]u8)),
ast.range,
),
)
}
} else if ast.value_token_kind == .Equals ||
ast.value_token_kind == .NotEquals ||
ast.value_token_kind == .GreaterThan ||
ast.value_token_kind == .GreaterThanOrEqual ||
ast.value_token_kind == .LessThan ||
ast.value_token_kind == .LessThanOrEqual {
ast.return_type = type_create_integer(1, true)
}
// FIXME: Verify that the operation is possible
case .UnaryExpression:
// FIXME: Verify that the operation is possible
type_check(ast.children[0], ast)
append(&g_message_list, message_create(.FIXME, fmt.aprintf("Check type in unary expression"), ast.range))
ast.return_type = ast.children[0].return_type
if ast.value_token_kind == .Increment || ast.value_token_kind == .Decrement {
if ast.value.(bool) {
ast^ = ast.children[0]^
append(&g_message_list, message_create(.FIXME, fmt.aprintf("Implement postfix inc/dec"), ast.range))
} else {
ast.kind = .BinaryExpression
var := ast.children[0]
op: ^Node
if ast.value_token_kind == .Increment {
op = node_create_binary(.Add, ast.range, var, node_create_value(.Integer, ast.range, 1))
} else {
op = node_create_binary(.Subtract, ast.range, var, node_create_value(.Integer, ast.range, 1))
}
append(&ast.children, op)
type_check(ast.children[1], ast)
ast.value_token_kind = .Assign
}
}
case .Ret:
function_return_type := scope_function_return_type_lookup()
if function_return_type == nil {
append(
&g_message_list,
message_create(.Error, fmt.aprintf("Return statement outside of function"), ast.range),
)
} else {
if function_return_type.kind == .Integer && function_return_type.bit_size == 0 && ast.children[0] == nil {
break
}
type_check(ast.children[0], ast)
ok, cast_required := compare_types(function_return_type, ast.children[0].return_type)
if cast_required {
cast_ := node_create_cast({}, ast.children[0], nil)
cast_.return_type = function_return_type
ast.children[0] = cast_
}
if !ok {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf(
"Type mismatch: {} and {}",
type_to_string(function_return_type),
type_to_string(ast.children[0].return_type),
),
ast.range,
),
)
}
}
case .Cast:
type_check(ast.children[0], ast)
type_to := ast_to_type(ast.children[1])
if ast.children[0].return_type.kind == .Struct || type_to.kind == .Struct {
append(&g_message_list, message_create(.Error, "Cannot cast to/from Struct type.", ast.range))
} else {
// FIXME: Check if compatible
append(
&g_message_list,
message_create(
.FIXME,
fmt.aprintf("Cast to type not checked: %s.", ast.children[1].value.([dynamic]u8)),
ast.range,
),
)
}
ast.return_type = type_to
case .BitwiseCast:
type_check(ast.children[0], ast)
// FIXME: Check if they are both the same bit size
append(
&g_message_list,
message_create(.FIXME, fmt.aprintf("BitwiseCast bit size check not implemented."), ast.range),
)
ast.return_type = ast_to_type(ast.children[1])
case .VariableDeclaration:
name_sum := get_character_sum_of_dyn_arr(&ast.children[0].value.([dynamic]u8))
if name_sum in scope_stack[len(scope_stack) - 1].variable_definitions {
append(
&g_message_list,
message_create(.Error, "A variable is already declared with the same name", ast.range),
)
return
}
if ast.children[2] != nil {
type_check(ast.children[2], ast)
if ast.children[1] == nil {
ast.return_type = ast.children[2].return_type
}
ok, cast_required := compare_types(ast.return_type, ast.children[2].return_type)
if cast_required {
cast_ := node_create_cast({}, ast.children[2], nil)
cast_.return_type = ast.return_type
ast.children[2] = cast_
}
if !ok {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Type mismatch: {} and {}", ast.return_type, ast.children[2].return_type),
ast.range,
),
)
return
}
} else {
ast.return_type = ast_to_type(ast.children[1])
}
scope_stack[len(scope_stack) - 1].variable_definitions[name_sum] = ast.return_type
scope_stack[len(scope_stack) - 1].variable_mutability_definitions[name_sum] = !ast.value.(bool)
case .If:
type_check(ast.children[0], ast)
if ast.children[0].return_type == nil || ast.children[0].return_type.kind != .Integer {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("If condition must be a signed/unsigned integer"),
ast.children[0].range,
),
)
break
}
type_check(ast.children[1], ast)
if len(ast.children) == 3 {
type_check(ast.children[2], ast)
} else {
append(&ast.children, node_create_block(ast.range, {}))
}
case .ExternFunction:
in_extern = true
fallthrough
case .Function:
scope_enter()
ast.return_type = ast_to_type(ast.children[0])
scope_stack[len(scope_stack) - 1].function_return_type = ast.return_type
for child, i in ast.children {
if in_extern == false {
if i < 2 {
continue
}
} else {
if i < 1 {
continue
}
}
type_check(child, ast)
scope_stack[len(scope_stack) - 1].variable_definitions[get_character_sum_of_dyn_arr(&child.children[0].value.([dynamic]u8))] =
child.return_type
scope_stack[len(scope_stack) - 1].variable_mutability_definitions[get_character_sum_of_dyn_arr(&child.children[0].value.([dynamic]u8))] =
true
}
if in_extern == false {
type_check(ast.children[1], ast)
if ast.return_type.kind == .Integer && ast.return_type.bit_size == 0 {
append(&ast.children[1].children, node_create_ret(ast.children[1].range, nil))
}
}
scope_leave()
case .For:
scope_enter()
for child, i in ast.children {
if child == nil {
continue
}
if i == 1 {
type_check(child, ast)
should_error := false
if child.return_type == nil {
should_error = true
} else if child.return_type.kind != .Integer {
should_error = true
}
if should_error {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("For condition must be a signed/unsigned integer"),
child.range,
),
)
break
}
} else {
type_check(child, ast)
}
}
scope_leave()
case .Struct: // Nothing
case .Enum: // Nothing
case .StructInitializer:
for child in ast.children {
type_check(child, ast)
}
node_print(ast)
struct_ := find_struct(ast.value.([dynamic]u8))
if struct_ == nil {
append(
&g_message_list,
message_create(.Error, fmt.aprintf("Undefined struct: %s", ast.value.([dynamic]u8)), ast.range),
)
break
}
if len(ast.children) != len(struct_.fields) {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf(
"Struct initializer field count mismatch: Wanted {}, got {}",
len(struct_.fields),
len(ast.children),
),
ast.range,
),
)
break
}
idx := 0
for &child in ast.children {
fmt.printf("Comp {} and {} (struct f)\n", child.return_type.kind, struct_.fields[idx].type.kind)
ok, cast_required := compare_types(child.return_type, struct_.fields[idx].type)
if cast_required {
cast_ := node_create_cast({}, child, {})
cast_.return_type = struct_.fields[idx].type
child = cast_
}
if !ok {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf(
"Type mismatch in struct initializer: Wanted {}, got {}",
type_to_string(struct_.fields[idx].type),
type_to_string(child.return_type),
),
child.range,
),
)
}
idx += 1
}
ast.return_type = type_create_struct(ast.value.([dynamic]u8))
case:
fmt.panicf("Unhandled node kind in type_check: {}", ast.kind)
}
}
find_function_definitions :: proc(ast_: ^Node) -> (ret: [dynamic]^FunctionType) {
if ast_.kind != .Block {
return
}
for ast in ast_.children {
if ast == nil {
continue
}
is_extern := false
#partial switch (ast.kind) {
case .ExternFunction:
is_extern = true
fallthrough
case .Function:
for fn in ret {
if compare_dyn_arrs(&fn.name, &ast.value.([dynamic]u8)) {
append(
&g_message_list,
message_create(
.Error,
fmt.aprintf("Function already defined: {}", ast.value.([dynamic]u8)),
ast.range,
),
)
continue
}
}
fn := function_type_create()
fn.name = ast.value.([dynamic]u8)
return_type: ^Type
if ast.children[0] == nil {
return_type = type_create_integer(0, false)
} else {
return_type = ast_to_type(ast.children[0])
}
fn.return_type = return_type
for decl, i in ast.children {
if is_extern == false {
if i < 2 {
continue
}
} else {
if i < 1 {
continue
}
}
type := ast_to_type(decl.children[1])
append(&fn.parameter_types, type)
}
append(&ret, fn)
case .Struct:
struct_ := struct_create()
should_ignore := true
for field in ast.children {
if field == nil {
continue
}
if should_ignore {
should_ignore = false
continue
}
if field.kind != .VariableDeclaration {
fmt.panicf("Expected VariableDeclaration in struct")
}
struct_field := struct_field_create()
struct_field.name = field.children[0].value.([dynamic]u8)
struct_field.type = ast_to_type(field.children[1])
field.return_type = struct_field.type
append(&struct_.fields, struct_field)
}
scope_stack[len(scope_stack) - 1].structure_definitions[get_character_sum_of_dyn_arr(&ast.children[0].value.([dynamic]u8))] =
struct_
case .Enum:
if ast.enum_value.type.kind != .Identifier {
append(
&g_message_list,
message_create(.Error, "The type of this struct must be a scalar", ast.enum_value.type.range),
)
}
type_ptr := ast_to_type(ast.enum_value.type)
if type_ptr.kind != .Integer {
append(
&g_message_list,
message_create(.Error, "The type of this struct must be an integer", ast.enum_value.type.range),
)
}
scope_stack[len(scope_stack) - 1].enum_definitions[get_character_sum_of_dyn_arr(&ast.value.([dynamic]u8))] =
&ast.enum_value
case:
}
}
return
}