1 files changed, 61 insertions, 41 deletions

diff --git a/src/gas_assembly_generator.c b/src/gas_assembly_generator.c
index bf98255..34864dd 100644
--- a/src/gas_assembly_generator.c
+++ b/src/gas_assembly_generator.c
@@ -21,66 +21,88 @@
 #include <stdlib.h>
 
 static void
-gas_assembly_generator_visit_function(ast_visitor_t *visitor, ast_function_declaration_t *func);
+gas_assembly_generator_binary_operation(gas_assembly_generator_t *gen, ast_binary_operation_t *binary_operation);
+
 static void
-gas_assembly_generator_visit_return_stmt(ast_visitor_t *visitor, ast_return_stmt_t *return_stmt);
+gas_assembly_generator_compile_function(gas_assembly_generator_t *gen, ast_function_declaration_t *func);
+
 static void
-gas_assembly_generator_visit_literal(ast_visitor_t *visitor, ast_literal_t *literal);
+gas_assembly_generator_compile_literal(gas_assembly_generator_t *gen, ast_literal_t *literal);
+
 static void
-gas_assembly_generator_binary_operation(ast_visitor_t *visitor, ast_binary_operation_t *binary_operation);
+gas_assembly_generator_compile_return_stmt(gas_assembly_generator_t *gen, ast_return_stmt_t *return_stmt);
+
+void
+gas_assembly_generator_init(gas_assembly_generator_t *gen, FILE *stream)
+{
+  assert(gen && stream);
+  gen->stream = stream;
+}
 
 void
-gas_assembly_generator_init(gas_assembly_generator_t *gen, FILE *out)
+gas_assembly_generator_compile(gas_assembly_generator_t *gen, ast_node_t *ast)
 {
-  assert(gen && out);
-  gen->super = (ast_visitor_t){ .visit_function = &gas_assembly_generator_visit_function,
-                                .visit_literal = &gas_assembly_generator_visit_literal,
-                                .visit_return_stmt = &gas_assembly_generator_visit_return_stmt,
-                                .visit_binary_operation = &gas_assembly_generator_binary_operation };
-  gen->out = out;
+  switch (ast->kind) {
+    case AST_BINARY_OPERATION:
+      gas_assembly_generator_binary_operation(gen, &ast->data.binary_operation);
+      break;
+    case AST_FUNCTION_DECLARATION:
+      gas_assembly_generator_compile_function(gen, &ast->data.function);
+      break;
+    case AST_LITERAL:
+      gas_assembly_generator_compile_literal(gen, &ast->data.literal);
+      break;
+    case AST_RETURN_STMT:
+      gas_assembly_generator_compile_return_stmt(gen, &ast->data.return_stmt);
+      break;
+    case AST_IDENTIFIER:
+      assert(false && "TODO: ast identifier not implemented yet");
+      break;
+    case AST_VARIABLE_DECLARATION:
+      assert(false && "TODO: ast variable declaration not implemented yet");
+      break;
+    case AST_UNKOWN_NODE:
+      assert(false && "unreachable");
+  }
 }
 
 static void
-gas_assembly_generator_visit_function(ast_visitor_t *visitor, ast_function_declaration_t *func)
+gas_assembly_generator_compile_function(gas_assembly_generator_t *gen, ast_function_declaration_t *func)
 {
-  assert(visitor && func);
+  assert(func);
 
   if (!string_view_eq(func->name, string_view_from_str("main"))) {
     fprintf(stderr, "[ERROR]: no main function has been defined!\n");
     exit(EXIT_FAILURE);
   }
 
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
-
-  fprintf(gen->out, ".global _start\n");
-  fprintf(gen->out, ".text\n");
-  fprintf(gen->out, "_start:\n");
+  fprintf(gen->stream, ".global _start\n");
+  fprintf(gen->stream, ".text\n");
+  fprintf(gen->stream, "_start:\n");
 
   for (size_t i = 0; i < func->body->size; i++) {
-    ast_visitor_visit(visitor, vector_at(func->body, i));
+    gas_assembly_generator_compile(gen, vector_at(func->body, i));
   }
 }
 
 static void
-gas_assembly_generator_visit_return_stmt(ast_visitor_t *visitor, ast_return_stmt_t *return_stmt)
+gas_assembly_generator_compile_return_stmt(gas_assembly_generator_t *gen, ast_return_stmt_t *return_stmt)
 {
-  assert(visitor && return_stmt);
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
+  assert(gen && return_stmt);
 
-  ast_visitor_visit(visitor, return_stmt->argument);
+  gas_assembly_generator_compile(gen, return_stmt->argument);
 
-  fprintf(gen->out, "  mov %%rax, %%rbx\n");
-  fprintf(gen->out, "  mov $1, %%al\n");
-  fprintf(gen->out, "  int $0x80\n");
+  fprintf(gen->stream, "  mov %%rax, %%rbx\n");
+  fprintf(gen->stream, "  mov $1, %%al\n");
+  fprintf(gen->stream, "  int $0x80\n");
 }
 
 static void
-gas_assembly_generator_visit_literal(ast_visitor_t *visitor, ast_literal_t *literal)
+gas_assembly_generator_compile_literal(gas_assembly_generator_t *gen, ast_literal_t *literal)
 {
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
   switch (literal->kind) {
     case AST_LITERAL_INTEGER:
-      fprintf(gen->out, "  mov $%d, %%rax\n", literal->value.integer);
+      fprintf(gen->stream, "  mov $%d, %%rax\n", literal->value.integer);
       return;
     default:
       assert(false && "no code generation strategy.");
@@ -88,36 +110,34 @@ gas_assembly_generator_visit_literal(ast_visitor_t *visitor, ast_literal_t *lite
 }
 
 static void
-gas_assembly_generator_binary_operation(ast_visitor_t *visitor, ast_binary_operation_t *binary_operation)
+gas_assembly_generator_binary_operation(gas_assembly_generator_t *gen, ast_binary_operation_t *binary_operation)
 {
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
-
-  ast_visitor_visit(visitor, binary_operation->right);
+  gas_assembly_generator_compile(gen, binary_operation->right);
 
-  fprintf(gen->out, "  push %%rax\n");
+  fprintf(gen->stream, "  push %%rax\n");
 
-  ast_visitor_visit(visitor, binary_operation->left);
+  gas_assembly_generator_compile(gen, binary_operation->left);
 
-  fprintf(gen->out, "  pop %%rcx\n");
+  fprintf(gen->stream, "  pop %%rcx\n");
 
   if (binary_operation->kind == AST_BINOP_ADITION) {
-    fprintf(gen->out, "  add %%rcx, %%rax\n");
+    fprintf(gen->stream, "  add %%rcx, %%rax\n");
     return;
   }
 
   if (binary_operation->kind == AST_BINOP_SUBTRACTION) {
-    fprintf(gen->out, "  sub %%rcx, %%rax\n");
+    fprintf(gen->stream, "  sub %%rcx, %%rax\n");
     return;
   }
 
   if (binary_operation->kind == AST_BINOP_MULTIPLICATION) {
-    fprintf(gen->out, "  mul %%rcx\n");
+    fprintf(gen->stream, "  mul %%rcx\n");
     return;
   }
 
   if (binary_operation->kind == AST_BINOP_DIVISION) {
-    fprintf(gen->out, "  xor %%rdx, %%rdx\n");
-    fprintf(gen->out, "  div %%rcx\n");
+    fprintf(gen->stream, "  xor %%rdx, %%rdx\n");
+    fprintf(gen->stream, "  div %%rcx\n");
     return;
   }