init basic

ccompiler/frontend/parser/symtab/symtab.c

@@ -0,0 +1,45 @@
+// symtab.c
+#include "../../frontend.h"
+#include "scope.h"
+#include "symtab.h"
+
+typedef struct SymbolTable SymbolTable;
+typedef struct Scope Scope;
+
+void init_symtab(SymbolTable* symtab) {
+    symtab->global_scope = scope_create(NULL);
+    symtab->cur_scope = symtab->global_scope;
+}
+
+void del_symtab(SymbolTable* symtab) {
+    scope_destroy(symtab->global_scope);
+}
+
+void symtab_enter_scope(SymbolTable* symtab) {
+    struct Scope* scope = scope_create(symtab->cur_scope);
+    scope->base_offset = symtab->cur_scope->base_offset + symtab->cur_scope->cur_offset;
+    symtab->cur_scope = scope;
+}
+
+void symtab_leave_scope(SymbolTable* symtab) {
+    Scope * scope = symtab->cur_scope;
+    if (scope == NULL) {
+        error("cannot leave NULL scope or global scope");
+    }
+    symtab->cur_scope = symtab->cur_scope->parent;
+    scope_destroy(scope);
+}
+
+void symtab_add_symbol(SymbolTable* symtab, const char* name, void* ast_node) {
+    struct Scope* scope = symtab->cur_scope;
+    if (scope_lookup_current(scope, name) != NULL) {
+        // TODO WARNING
+        // return NULL;
+    }
+
+    scope_insert(scope, name, ast_node);
+}
+
+void* symtab_lookup_symbol(SymbolTable* symtab, const char* name) {
+    return scope_lookup(symtab->cur_scope, name);
+}