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(* This Source Code Form is subject to the terms of the Mozilla Public License,
v. 2.0. If a copy of the MPL was not distributed with this file, You can
obtain one at https://mozilla.org/MPL/2.0/. *)
module
import sys.posix.cstdlib, common, ast
type
ElnaSymbolInfoKind* = (type_info, temporary_info, procedure_info)
ElnaSymbolInfo* = record
kind: ElnaSymbolInfoKind
end
ElnaSymbolTypeInfo* = record(ElnaSymbolInfo)
_type: ^ElnaType
end
ElnaSymbolTemporaryInfo* = record(ElnaSymbolInfo)
attr: Word;
variable_type: ^ElnaType
end
ElnaSymbolProcedureInfo* = record(ElnaSymbolInfo)
symbol_table: ^ElnaSymbolTable;
procedure_type: ^ElnaTypeProcedure;
is_extern: Bool
end
ElnaSymbolEntry* = record
name: []const Word8;
symbol_info: ^ElnaSymbolInfo
end
ElnaSymbolTable* = record
count: Word;
capacity: Word;
parent: ^ElnaSymbolTable;
symbols: ^ElnaSymbolEntry
end
var
symbol_table_global*: ^ElnaSymbolTable
word_type*: ^ElnaType
int_type*: ^ElnaType
pointer_type*: ^ElnaType
bool_type*: ^ElnaType
char_type*: ^ElnaType
string_type*: ^ElnaTypeRecord
proc elna_symbol_type_info_create*(type_representation: ^ElnaType) -> ^ElnaSymbolTypeInfo
var
result: ^ElnaSymbolTypeInfo
begin
result := malloc#[ElnaSymbolTypeInfo](#size(ElnaSymbolTypeInfo));
result^.kind := ElnaSymbolInfoKind.type_info;
result^._type := type_representation
return result
proc elna_symbol_temporary_info_create*(attr: Word; temporary_type: ^ElnaType) -> ^ElnaSymbolTemporaryInfo
var
result: ^ElnaSymbolTemporaryInfo
begin
result := malloc#[ElnaSymbolTemporaryInfo](#size(ElnaSymbolTemporaryInfo));
result^.kind := ElnaSymbolInfoKind.temporary_info;
result^.variable_type := temporary_type;
result^.attr := attr
return result
proc elna_symbol_procedure_info_create*(is_extern: Bool) -> ^ElnaSymbolProcedureInfo
var
result: ^ElnaSymbolProcedureInfo
begin
result := malloc#[ElnaSymbolProcedureInfo](#size(ElnaSymbolProcedureInfo));
result^.kind := ElnaSymbolInfoKind.procedure_info;
result^.procedure_type := nil;
result^.symbol_table := nil;
result^.is_extern := is_extern
return result
proc elna_symbol_table_create*(parent: ^ElnaSymbolTable) -> ^ElnaSymbolTable
var
new_symbol_table: ^ElnaSymbolTable
begin
new_symbol_table := malloc#[ElnaSymbolTable](#size(ElnaSymbolTable));
new_symbol_table^.capacity := 64u;
new_symbol_table^.symbols := malloc#[ElnaSymbolEntry](new_symbol_table^.capacity * #size(ElnaSymbolEntry));
new_symbol_table^.count := 0u;
new_symbol_table^.parent := parent
return new_symbol_table
proc elna_symbol_table_enter*(symbol_table: ^ElnaSymbolTable; symbol_name: []const Word8; symbol: ^ElnaSymbolInfo)
var
entry: ^ElnaSymbolEntry
begin
if symbol_table^.count >= symbol_table^.capacity then
symbol_table^.capacity := symbol_table^.capacity * 2u;
symbol_table^.symbols := realloc#[ElnaSymbolEntry](symbol_table^.symbols, symbol_table^.capacity * #size(ElnaSymbolEntry))
end;
entry := symbol_table^.symbols + symbol_table^.count;
entry^.name := symbol_name;
entry^.symbol_info := symbol;
symbol_table^.count := symbol_table^.count + 1u
return
proc elna_symbol_table_lookup_local*(symbol_table: ^ElnaSymbolTable; symbol_name: []const Word8) -> ^ElnaSymbolInfo
var
i: Word := 0u
entry: ^ElnaSymbolEntry
result: ^ElnaSymbolInfo := nil
begin
while i < symbol_table^.count & result = nil do
entry := symbol_table^.symbols + i;
if entry^.name = symbol_name then
result := entry^.symbol_info
end;
i := i + 1u
end
return result
proc elna_symbol_table_lookup*(symbol_table: ^ElnaSymbolTable; symbol_name: []const Word8) -> ^ElnaSymbolInfo
var
current: ^ElnaSymbolTable
found: ^ElnaSymbolInfo := nil
begin
current := symbol_table;
while current <> nil & found = nil do
found := elna_symbol_table_lookup_local(current, symbol_name);
current := current^.parent
end
return found
proc elna_symbol_string_build()
var
current_field: ^ElnaTypeField
char_pointer: ^ElnaTypePointer
begin
string_type := malloc#[ElnaTypeRecord](#size(ElnaTypeRecord));
string_type^.kind := ElnaTypeKind._record;
string_type^.size := 16u;
string_type^.alignment := 8u;
string_type^.members := malloc#[ElnaTypeField](2u * #size(ElnaTypeField));
string_type^.length := 2u;
char_pointer := malloc#[ElnaTypePointer](#size(ElnaTypePointer));
char_pointer^.kind := ElnaTypeKind.pointer;
char_pointer^.size := 8u;
char_pointer^.alignment := 8u;
char_pointer^.base := char_type;
current_field := string_type^.members;
current_field^.name := "ptr";
current_field^.field_type := cast(char_pointer: ^ElnaType);
current_field := current_field + 1u;
current_field^.name := "length";
current_field^.field_type := word_type
return
proc elna_symbol_table_build*()
var
current_info: ^ElnaSymbolTypeInfo
begin
symbol_table_global := elna_symbol_table_create(nil);
word_type := malloc#[ElnaType](#size(ElnaType));
word_type^.kind := ElnaTypeKind.primitive;
word_type^.size := 8u;
word_type^.alignment := 8u;
current_info := elna_symbol_type_info_create(word_type);
elna_symbol_table_enter(symbol_table_global, "Word", cast(current_info: ^ElnaSymbolInfo));
int_type := malloc#[ElnaType](#size(ElnaType));
int_type^.kind := ElnaTypeKind.primitive;
int_type^.size := 8u;
int_type^.alignment := 8u;
current_info := elna_symbol_type_info_create(int_type);
elna_symbol_table_enter(symbol_table_global, "Int", cast(current_info: ^ElnaSymbolInfo));
pointer_type := malloc#[ElnaType](#size(ElnaType));
pointer_type^.kind := ElnaTypeKind.primitive;
pointer_type^.size := 8u;
pointer_type^.alignment := 8u;
current_info := elna_symbol_type_info_create(pointer_type);
elna_symbol_table_enter(symbol_table_global, "Pointer", cast(current_info: ^ElnaSymbolInfo));
bool_type := malloc#[ElnaType](#size(ElnaType));
bool_type^.kind := ElnaTypeKind.primitive;
bool_type^.size := 1u;
bool_type^.alignment := 1u;
current_info := elna_symbol_type_info_create(bool_type);
elna_symbol_table_enter(symbol_table_global, "Bool", cast(current_info: ^ElnaSymbolInfo));
char_type := malloc#[ElnaType](#size(ElnaType));
char_type^.kind := ElnaTypeKind.primitive;
char_type^.size := 1u;
char_type^.alignment := 1u;
current_info := elna_symbol_type_info_create(char_type);
elna_symbol_table_enter(symbol_table_global, "Char", cast(current_info: ^ElnaSymbolInfo));
elna_symbol_string_build();
current_info := elna_symbol_type_info_create(cast(string_type: ^ElnaType));
elna_symbol_table_enter(symbol_table_global, "String", cast(current_info: ^ElnaSymbolInfo))
return
end.
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