typedef union Instance Instance;
struct Object;
typedef struct Object Object;
+struct EnvironmentNode;
+typedef struct EnvironmentNode EnvironmentNode;
+struct Environment;
+typedef struct Environment Environment;
const char* const STRING_LITERAL_LIST[] = {
{% for string_literal in string_literal_list %}
union Instance
{
bool boolean;
- Object (*closure)(size_t, Object*);
+ Object (*closure)(Environment*, size_t, Object*);
int32_t integer;
const char* string;
};
false
};
-struct EnvironmentNode;
-typedef struct EnvironmentNode EnvironmentNode;
struct EnvironmentNode
{
const char* key;
EnvironmentNode* next;
};
-struct Environment;
-typedef struct Environment Environment;
struct Environment
{
+ size_t referenceCount;
+ Environment* parent;
EnvironmentNode* root;
};
-Environment* Environment_construct()
+Environment* Environment_construct(Environment* parent)
{
- // TODO Handle malloc returning NULL
Environment* result = malloc(sizeof(Environment));
+ result->referenceCount = 1;
+ result->parent = parent;
result->root = NULL;
return result;
}
void Environment_destruct(Environment* self)
{
- EnvironmentNode* next;
- for(EnvironmentNode* node = self->root; node != NULL; node = next)
+ self->referenceCount--;
+
+ if(self->referenceCount == 0)
{
- // No objects are allocated on the heap (yet!) so we don't need to free anything else
- next = node->next;
- free(node);
+ EnvironmentNode* next;
+ for(EnvironmentNode* node = self->root; node != NULL; node = next)
+ {
+ // No objects are allocated on the heap (yet!) so we don't need to free anything else
+ next = node->next;
+ free(node);
+ }
+ free(self);
}
}
}
}
+ if(self->parent != NULL)
+ {
+ return Environment_get(self->parent, symbol);
+ }
+
// TODO Handle symbol errors
assert(false);
}
}
{% if 'pow' in builtins %}
-Object builtin$pow$implementation(size_t argc, Object* args)
+Object builtin$pow$implementation(Environment* parent, size_t argc, Object* args)
{
assert(argc == 2);
{% endif %}
{% if 'print' in builtins %}
-Object builtin$print$implementation(size_t argc, Object* args)
+Object builtin$print$implementation(Environment* parent, size_t argc, Object* args)
{
for(size_t i = 0; i < argc; i++)
{
{% endif %}
{% for function_definition in function_definition_list %}
-Object user${{function_definition.name}}$implementation(size_t argc, Object* args)
+Object user${{function_definition.name}}$implementation(Environment* parent, size_t argc, Object* args)
{
- Environment* environment = Environment_construct();
+ Environment* environment = Environment_construct(parent);
- {% for statement in function_definition.statement_list %}
+ {% for statement in function_definition.statement_list[:-1] %}
{{ generate_statement(statement) }}
{% endfor %}
int main(int argc, char** argv)
{
- Environment* environment = Environment_construct();
+ Environment* environment = Environment_construct(NULL);
// TODO Use the symbol from SYMBOL_LIST
{% for builtin in builtins %}