Experiments/libabacus
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Add beginnings of function calling code.

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This commit is contained in:
Danila Fedorin 2018-05-22 15:21:10 -07:00
parent 2a1d51ae78
commit 070dc179ff
2 changed files with 267 additions and 1 deletions
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4
include/result.h
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@ -15,7 +15,9 @@ enum libab_result_e {
LIBAB_EOF,
LIBAB_UNEXPECTED,
LIBAB_AMBIGOUS_TYPE,
LIBAB_MISMATCHED_TYPE
LIBAB_MISMATCHED_TYPE,
LIBAB_BAD_CALL,
LIBAB_AMBIGOUS_CALL
};
typedef enum libab_result_e libab_result;

264
src/interpreter.c
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@ -1,5 +1,6 @@
#include "libabacus.h"
#include "util.h"
#include "value.h"
void libab_interpreter_init(libab_interpreter* intr, libab* ab) {
intr->ab = ab;
@ -41,6 +42,269 @@ libab_result _interpreter_create_num_val(struct interpreter_state* state,
return result;
}
libab_result _interpreter_compare_types(libab_ref* left_type, libab_ref* right_type,
libab_ref_trie* left_params, libab_ref_trie* right_params) {
libab_result result = LIBAB_SUCCESS;
int left_placeholder;
int right_placeholder;
libab_parsetype* left = libab_ref_get(left_type);
libab_parsetype* right = libab_ref_get(right_type);
libab_ref param_type;
left_placeholder = left->variant & LIBABACUS_TYPE_F_PLACE;
right_placeholder = right->variant & LIBABACUS_TYPE_F_PLACE;
if(left_placeholder && right_placeholder) {
result = LIBAB_AMBIGOUS_TYPE;
} else {
if(left_placeholder) {
const char* name = left->data_u.name;
libab_ref_trie_get(left_params, name, &param_type);
left = libab_ref_get(&param_type);
libab_ref_free(&param_type);
if(left == NULL)
result = libab_ref_trie_put(left_params, name, right_type);
} else if(right_placeholder) {
const char* name = right->data_u.name;
libab_ref_trie_get(right_params, name, &param_type);
right = libab_ref_get(&param_type);
libab_ref_free(&param_type);
if(right == NULL)
result = libab_ref_trie_put(right_params, name, left_type);
}
if(left != NULL && right != NULL) {
size_t index = 0;
libab_ref temp_left;
libab_ref temp_right;
result = (left->data_u.base == right->data_u.base) ? LIBAB_SUCCESS : LIBAB_MISMATCHED_TYPE;
if(result == LIBAB_SUCCESS &&
(left->variant & LIBABACUS_TYPE_F_PARENT || right->variant & LIBABACUS_TYPE_F_PARENT)) {
result = (left->variant & right->variant & LIBABACUS_TYPE_F_PARENT) ? LIBAB_SUCCESS : LIBAB_MISMATCHED_TYPE;
if(result == LIBAB_SUCCESS) {
result = (left->children.size == right->children.size) ? LIBAB_SUCCESS : LIBAB_MISMATCHED_TYPE;
}
for(; index < left->children.size && result == LIBAB_SUCCESS; index++) {
libab_ref_vec_index(&left->children, index, &temp_left);
libab_ref_vec_index(&right->children, index, &temp_right);
result = _interpreter_compare_types(&temp_left, &temp_right, left_params, right_params);
libab_ref_free(&temp_left);
libab_ref_free(&temp_right);
}
}
}
}
return result;
}
libab_result _interpreter_resolve_type_params(libab_ref* type, libab_ref_trie* params, libab_ref* into) {
libab_result result = LIBAB_SUCCESS;
return result;
}
libab_result _interpreter_check_function(struct interpreter_state* state,
libab_ref* func, libab_ref_vec* params,
libab_ref_vec* types) {
libab_result result = LIBAB_SUCCESS;
libab_value* value;
libab_parsetype* function_type;
libab_ref_trie function_params;
libab_ref_trie_init(&function_params);
value = libab_ref_get(func);
function_type = libab_ref_get(&value->type);
if (params->size >= function_type->children.size) {
result = LIBAB_BAD_CALL;
} else {
libab_ref_trie child_params;
libab_ref left_temp;
libab_ref right_value_temp;
libab_ref* right_temp;
libab_ref produced_type;
size_t index = 0;
for(; index < params->size && result == LIBAB_SUCCESS; index++) {
libab_ref_trie_init(&child_params);
libab_ref_vec_index(&function_type->children, index, &left_temp);
libab_ref_vec_index(params, index, &right_value_temp);
right_temp = &((libab_value*) libab_ref_get(&right_value_temp))->type;
result = _interpreter_compare_types(&left_temp,
right_temp, &function_params, &child_params);
if(result == LIBAB_SUCCESS) {
result = _interpreter_resolve_type_params(right_temp, &child_params, &produced_type);
}
if(result == LIBAB_SUCCESS) {
result = libab_ref_vec_insert(types, &produced_type);
}
libab_ref_free(&produced_type);
libab_ref_free(&left_temp);
libab_ref_free(&right_value_temp);
libab_ref_trie_free(&child_params);
}
}
if(result != LIBAB_SUCCESS) {
libab_ref_vec_clear(types);
}
return result;
}
libab_result _interpreter_find_match(struct interpreter_state* state,
libab_function_list* function_values, libab_ref_vec* params,
libab_ref_vec* new_types, libab_ref* match, int partial) {
libab_result result = LIBAB_SUCCESS;
size_t index = 0;
size_t list_size = libab_function_list_size(function_values);
int found_match = 0;
libab_ref_vec temp_new_types;
libab_ref temp_function_value;
libab_parsetype* temp_function_type;
libab_ref_null(match);
result = libab_ref_vec_init(&temp_new_types);
for(; index < list_size && result == LIBAB_SUCCESS; index++) {
libab_function_list_index(function_values, index, &temp_function_value);
temp_function_type = libab_ref_get(&((libab_value*) libab_ref_get(&temp_function_value))->type);
if(((temp_function_type->children.size == params->size + 1) && !partial) ||
((temp_function_type->children.size > params->size + 1) && partial)) {
/* We found a function that has the correct number of parameters. */
result = _interpreter_check_function(state, &temp_function_value, params, &temp_new_types);
if(result == LIBAB_MISMATCHED_TYPE) {
/* Mismatch is OK. */
result = LIBAB_SUCCESS;
} else if(result == LIBAB_SUCCESS) {
/* Function matched; now, check for other matching calls.
* More than one matching calls = ambigous call. */
if(!found_match) {
/* We haven't found a match previously. Copy data into new_types,
* and use new memory for temp list. */
found_match = 1;
*new_types = temp_new_types;
libab_ref_free(match);
libab_ref_copy(&temp_function_value, match);
result = libab_ref_vec_init(&temp_new_types);
if(result != LIBAB_SUCCESS) {
libab_ref_vec_free(new_types);
}
} else {
/* We've found a match previously. So, new_types are initialized,
* and the call is ambigous. Free all data. */
libab_ref_vec_free(new_types);
libab_ref_vec_free(&temp_new_types);
result = LIBAB_AMBIGOUS_CALL;
}
} else {
/* Something bad happened. Free data as best as we can. */
libab_ref_vec_free(&temp_new_types);
if(found_match) libab_ref_vec_free(new_types);
}
}
libab_ref_free(&temp_function_value);
}
if(result == LIBAB_SUCCESS) {
libab_ref_vec_free(&temp_new_types);
} else {
libab_ref_free(match);
libab_ref_null(match);
}
return result;
}
libab_result _interpreter_cast_param(libab_ref* param, libab_ref* type, libab_ref_vec* into) {
libab_result result = LIBAB_SUCCESS;
libab_value* old_value = libab_ref_get(param);
libab_ref new_value;
result = libab_create_value_ref(&new_value, &old_value->type, type);
if(result == LIBAB_SUCCESS) {
result = libab_ref_vec_insert(into, &new_value);
}
libab_ref_free(&new_value);
return result;
}
libab_result _interpreter_cast_params(libab_ref_vec* params, libab_ref_vec* new_types, libab_ref_vec* into) {
libab_result result = LIBAB_SUCCESS;
size_t index = 0;
libab_ref temp_param;
libab_ref temp_type;
for(; index < params->size && result == LIBAB_SUCCESS; index++) {
libab_ref_vec_index(params, index, &temp_param);
libab_ref_vec_index(new_types, index, &temp_type);
result = _interpreter_cast_param(&temp_param, &temp_type, into);
libab_ref_free(&temp_param);
libab_ref_free(&temp_type);
}
return result;
}
libab_result _interpreter_perform_call(libab_function* to_call, libab_ref_vec* params, libab_ref* into) {
libab_result result = LIBAB_SUCCESS;
return result;
}
libab_result _interpreter_call_function_list(struct interpreter_state* state,
libab_function_list* list, libab_ref_vec* params) {
libab_result result = LIBAB_SUCCESS;
libab_ref_vec new_types;
libab_ref to_call;
result = _interpreter_find_match(state, list, params, &new_types, &to_call, 0);
if(result == LIBAB_SUCCESS) {
if(libab_ref_get(&to_call) == NULL) {
result = _interpreter_find_match(state, list, params, &new_types, &to_call, 1);
}
}
if(result == LIBAB_SUCCESS && libab_ref_get(&to_call) == NULL) {
result = LIBAB_BAD_CALL;
}
if(result == LIBAB_SUCCESS) {
libab_ref_vec new_params;
libab_function* function;
function = libab_ref_get(&to_call);
/* result = libab_ref_vec_init_copy(&new_params, &function->params); */
if(result == LIBAB_SUCCESS) {
result = _interpreter_cast_params(params, &new_types, &new_params);
if(result == LIBAB_SUCCESS) {
result = _interpreter_perform_call(function, &new_params, NULL);
}
if(result != LIBAB_SUCCESS) {
libab_ref_vec_free(&new_params);
}
}
if(result != LIBAB_SUCCESS) {
libab_ref_vec_free(&new_types);
}
}
if(result != LIBAB_SUCCESS) {
libab_ref_free(&to_call);
}
return result;
}
libab_result _interpreter_run(struct interpreter_state* state, libab_tree* tree,
libab_ref* into, libab_ref* scope,
int force_scope) {