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compile.c
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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2015 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "py/scope.h"
#include "py/emit.h"
#include "py/compile.h"
#include "py/runtime.h"
#include "py/asmbase.h"
#if MICROPY_ENABLE_COMPILER
// TODO need to mangle __attr names
typedef enum {
// define rules with a compile function
#define DEF_RULE(rule, comp, kind, ...) PN_##rule,
#define DEF_RULE_NC(rule, kind, ...)
#include "py/grammar.h"
#undef DEF_RULE
#undef DEF_RULE_NC
PN_const_object, // special node for a constant, generic Python object
// define rules without a compile function
#define DEF_RULE(rule, comp, kind, ...)
#define DEF_RULE_NC(rule, kind, ...) PN_##rule,
#include "py/grammar.h"
#undef DEF_RULE
#undef DEF_RULE_NC
} pn_kind_t;
#define NEED_METHOD_TABLE MICROPY_EMIT_NATIVE
#if NEED_METHOD_TABLE
// we need a method table to do the lookup for the emitter functions
#define EMIT(fun) (comp->emit_method_table->fun(comp->emit))
#define EMIT_ARG(fun, ...) (comp->emit_method_table->fun(comp->emit, __VA_ARGS__))
#define EMIT_LOAD_FAST(qst, local_num) (comp->emit_method_table->load_id.fast(comp->emit, qst, local_num))
#define EMIT_LOAD_GLOBAL(qst) (comp->emit_method_table->load_id.global(comp->emit, qst))
#else
// if we only have the bytecode emitter enabled then we can do a direct call to the functions
#define EMIT(fun) (mp_emit_bc_##fun(comp->emit))
#define EMIT_ARG(fun, ...) (mp_emit_bc_##fun(comp->emit, __VA_ARGS__))
#define EMIT_LOAD_FAST(qst, local_num) (mp_emit_bc_load_fast(comp->emit, qst, local_num))
#define EMIT_LOAD_GLOBAL(qst) (mp_emit_bc_load_global(comp->emit, qst))
#endif
#if MICROPY_EMIT_NATIVE
// define a macro to access external native emitter
#if MICROPY_EMIT_X64
#define NATIVE_EMITTER(f) emit_native_x64_##f
#elif MICROPY_EMIT_X86
#define NATIVE_EMITTER(f) emit_native_x86_##f
#elif MICROPY_EMIT_THUMB
#define NATIVE_EMITTER(f) emit_native_thumb_##f
#elif MICROPY_EMIT_ARM
#define NATIVE_EMITTER(f) emit_native_arm_##f
#elif MICROPY_EMIT_XTENSA
#define NATIVE_EMITTER(f) emit_native_xtensa_##f
#else
#error "unknown native emitter"
#endif
#endif
#if MICROPY_EMIT_INLINE_ASM
// define macros for inline assembler
#if MICROPY_EMIT_INLINE_THUMB
#define ASM_DECORATOR_QSTR MP_QSTR_asm_thumb
#define ASM_EMITTER(f) emit_inline_thumb_##f
#elif MICROPY_EMIT_INLINE_XTENSA
#define ASM_DECORATOR_QSTR MP_QSTR_asm_xtensa
#define ASM_EMITTER(f) emit_inline_xtensa_##f
#else
#error "unknown asm emitter"
#endif
#endif
#define EMIT_INLINE_ASM(fun) (comp->emit_inline_asm_method_table->fun(comp->emit_inline_asm))
#define EMIT_INLINE_ASM_ARG(fun, ...) (comp->emit_inline_asm_method_table->fun(comp->emit_inline_asm, __VA_ARGS__))
// elements in this struct are ordered to make it compact
typedef struct _compiler_t {
qstr source_file;
uint8_t is_repl;
uint8_t pass; // holds enum type pass_kind_t
uint8_t func_arg_is_super; // used to compile special case of super() function call
uint8_t have_star;
// try to keep compiler clean from nlr
mp_obj_t compile_error; // set to an exception object if there's an error
size_t compile_error_line; // set to best guess of line of error
uint next_label;
uint16_t num_dict_params;
uint16_t num_default_params;
uint16_t break_label; // highest bit set indicates we are breaking out of a for loop
uint16_t continue_label;
uint16_t cur_except_level; // increased for SETUP_EXCEPT, SETUP_FINALLY; decreased for POP_BLOCK, POP_EXCEPT
uint16_t break_continue_except_level;
scope_t *scope_head;
scope_t *scope_cur;
emit_t *emit; // current emitter
#if NEED_METHOD_TABLE
const emit_method_table_t *emit_method_table; // current emit method table
#endif
#if MICROPY_EMIT_INLINE_ASM
emit_inline_asm_t *emit_inline_asm; // current emitter for inline asm
const emit_inline_asm_method_table_t *emit_inline_asm_method_table; // current emit method table for inline asm
#endif
} compiler_t;
STATIC void compile_error_set_line(compiler_t *comp, mp_parse_node_t pn) {
// if the line of the error is unknown then try to update it from the pn
if (comp->compile_error_line == 0 && MP_PARSE_NODE_IS_STRUCT(pn)) {
comp->compile_error_line = ((mp_parse_node_struct_t*)pn)->source_line;
}
}
STATIC void compile_syntax_error(compiler_t *comp, mp_parse_node_t pn, const char *msg) {
// only register the error if there has been no other error
if (comp->compile_error == MP_OBJ_NULL) {
comp->compile_error = mp_obj_new_exception_msg(&mp_type_SyntaxError, msg);
compile_error_set_line(comp, pn);
}
}
STATIC void compile_trailer_paren_helper(compiler_t *comp, mp_parse_node_t pn_arglist, bool is_method_call, int n_positional_extra);
STATIC void compile_comprehension(compiler_t *comp, mp_parse_node_struct_t *pns, scope_kind_t kind);
STATIC void compile_node(compiler_t *comp, mp_parse_node_t pn);
STATIC uint comp_next_label(compiler_t *comp) {
return comp->next_label++;
}
STATIC void compile_increase_except_level(compiler_t *comp) {
comp->cur_except_level += 1;
if (comp->cur_except_level > comp->scope_cur->exc_stack_size) {
comp->scope_cur->exc_stack_size = comp->cur_except_level;
}
}
STATIC void compile_decrease_except_level(compiler_t *comp) {
assert(comp->cur_except_level > 0);
comp->cur_except_level -= 1;
}
STATIC scope_t *scope_new_and_link(compiler_t *comp, scope_kind_t kind, mp_parse_node_t pn, uint emit_options) {
scope_t *scope = scope_new(kind, pn, comp->source_file, emit_options);
scope->parent = comp->scope_cur;
scope->next = NULL;
if (comp->scope_head == NULL) {
comp->scope_head = scope;
} else {
scope_t *s = comp->scope_head;
while (s->next != NULL) {
s = s->next;
}
s->next = scope;
}
return scope;
}
typedef void (*apply_list_fun_t)(compiler_t *comp, mp_parse_node_t pn);
STATIC void apply_to_single_or_list(compiler_t *comp, mp_parse_node_t pn, pn_kind_t pn_list_kind, apply_list_fun_t f) {
if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, pn_list_kind)) {
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
int num_nodes = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
for (int i = 0; i < num_nodes; i++) {
f(comp, pns->nodes[i]);
}
} else if (!MP_PARSE_NODE_IS_NULL(pn)) {
f(comp, pn);
}
}
STATIC void compile_generic_all_nodes(compiler_t *comp, mp_parse_node_struct_t *pns) {
int num_nodes = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
for (int i = 0; i < num_nodes; i++) {
compile_node(comp, pns->nodes[i]);
if (comp->compile_error != MP_OBJ_NULL) {
// add line info for the error in case it didn't have a line number
compile_error_set_line(comp, pns->nodes[i]);
return;
}
}
}
STATIC void compile_load_id(compiler_t *comp, qstr qst) {
if (comp->pass == MP_PASS_SCOPE) {
mp_emit_common_get_id_for_load(comp->scope_cur, qst);
} else {
#if NEED_METHOD_TABLE
mp_emit_common_id_op(comp->emit, &comp->emit_method_table->load_id, comp->scope_cur, qst);
#else
mp_emit_common_id_op(comp->emit, &mp_emit_bc_method_table_load_id_ops, comp->scope_cur, qst);
#endif
}
}
STATIC void compile_store_id(compiler_t *comp, qstr qst) {
if (comp->pass == MP_PASS_SCOPE) {
mp_emit_common_get_id_for_modification(comp->scope_cur, qst);
} else {
#if NEED_METHOD_TABLE
mp_emit_common_id_op(comp->emit, &comp->emit_method_table->store_id, comp->scope_cur, qst);
#else
mp_emit_common_id_op(comp->emit, &mp_emit_bc_method_table_store_id_ops, comp->scope_cur, qst);
#endif
}
}
STATIC void compile_delete_id(compiler_t *comp, qstr qst) {
if (comp->pass == MP_PASS_SCOPE) {
mp_emit_common_get_id_for_modification(comp->scope_cur, qst);
} else {
#if NEED_METHOD_TABLE
mp_emit_common_id_op(comp->emit, &comp->emit_method_table->delete_id, comp->scope_cur, qst);
#else
mp_emit_common_id_op(comp->emit, &mp_emit_bc_method_table_delete_id_ops, comp->scope_cur, qst);
#endif
}
}
STATIC void c_tuple(compiler_t *comp, mp_parse_node_t pn, mp_parse_node_struct_t *pns_list) {
int total = 0;
if (!MP_PARSE_NODE_IS_NULL(pn)) {
compile_node(comp, pn);
total += 1;
}
if (pns_list != NULL) {
int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns_list);
for (int i = 0; i < n; i++) {
compile_node(comp, pns_list->nodes[i]);
}
total += n;
}
EMIT_ARG(build_tuple, total);
}
STATIC void compile_generic_tuple(compiler_t *comp, mp_parse_node_struct_t *pns) {
// a simple tuple expression
c_tuple(comp, MP_PARSE_NODE_NULL, pns);
}
STATIC void c_if_cond(compiler_t *comp, mp_parse_node_t pn, bool jump_if, int label) {
if (mp_parse_node_is_const_false(pn)) {
if (jump_if == false) {
EMIT_ARG(jump, label);
}
return;
} else if (mp_parse_node_is_const_true(pn)) {
if (jump_if == true) {
EMIT_ARG(jump, label);
}
return;
} else if (MP_PARSE_NODE_IS_STRUCT(pn)) {
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_or_test) {
if (jump_if == false) {
and_or_logic1:;
uint label2 = comp_next_label(comp);
for (int i = 0; i < n - 1; i++) {
c_if_cond(comp, pns->nodes[i], !jump_if, label2);
}
c_if_cond(comp, pns->nodes[n - 1], jump_if, label);
EMIT_ARG(label_assign, label2);
} else {
and_or_logic2:
for (int i = 0; i < n; i++) {
c_if_cond(comp, pns->nodes[i], jump_if, label);
}
}
return;
} else if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_and_test) {
if (jump_if == false) {
goto and_or_logic2;
} else {
goto and_or_logic1;
}
} else if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_not_test_2) {
c_if_cond(comp, pns->nodes[0], !jump_if, label);
return;
} else if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_atom_paren) {
// cond is something in parenthesis
if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
// empty tuple, acts as false for the condition
if (jump_if == false) {
EMIT_ARG(jump, label);
}
} else {
assert(MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp));
// non-empty tuple, acts as true for the condition
if (jump_if == true) {
EMIT_ARG(jump, label);
}
}
return;
}
}
// nothing special, fall back to default compiling for node and jump
compile_node(comp, pn);
EMIT_ARG(pop_jump_if, jump_if, label);
}
typedef enum { ASSIGN_STORE, ASSIGN_AUG_LOAD, ASSIGN_AUG_STORE } assign_kind_t;
STATIC void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t kind);
STATIC void c_assign_atom_expr(compiler_t *comp, mp_parse_node_struct_t *pns, assign_kind_t assign_kind) {
if (assign_kind != ASSIGN_AUG_STORE) {
compile_node(comp, pns->nodes[0]);
}
if (MP_PARSE_NODE_IS_STRUCT(pns->nodes[1])) {
mp_parse_node_struct_t *pns1 = (mp_parse_node_struct_t*)pns->nodes[1];
if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_atom_expr_trailers) {
int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns1);
if (assign_kind != ASSIGN_AUG_STORE) {
for (int i = 0; i < n - 1; i++) {
compile_node(comp, pns1->nodes[i]);
}
}
assert(MP_PARSE_NODE_IS_STRUCT(pns1->nodes[n - 1]));
pns1 = (mp_parse_node_struct_t*)pns1->nodes[n - 1];
}
if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_trailer_bracket) {
if (assign_kind == ASSIGN_AUG_STORE) {
EMIT(rot_three);
EMIT(store_subscr);
} else {
compile_node(comp, pns1->nodes[0]);
if (assign_kind == ASSIGN_AUG_LOAD) {
EMIT(dup_top_two);
EMIT(load_subscr);
} else {
EMIT(store_subscr);
}
}
} else if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_trailer_period) {
assert(MP_PARSE_NODE_IS_ID(pns1->nodes[0]));
if (assign_kind == ASSIGN_AUG_LOAD) {
EMIT(dup_top);
EMIT_ARG(load_attr, MP_PARSE_NODE_LEAF_ARG(pns1->nodes[0]));
} else {
if (assign_kind == ASSIGN_AUG_STORE) {
EMIT(rot_two);
}
EMIT_ARG(store_attr, MP_PARSE_NODE_LEAF_ARG(pns1->nodes[0]));
}
} else {
goto cannot_assign;
}
} else {
goto cannot_assign;
}
return;
cannot_assign:
compile_syntax_error(comp, (mp_parse_node_t)pns, "can't assign to expression");
}
// we need to allow for a caller passing in 1 initial node (node_head) followed by an array of nodes (nodes_tail)
STATIC void c_assign_tuple(compiler_t *comp, mp_parse_node_t node_head, uint num_tail, mp_parse_node_t *nodes_tail) {
uint num_head = (node_head == MP_PARSE_NODE_NULL) ? 0 : 1;
// look for star expression
uint have_star_index = -1;
if (num_head != 0 && MP_PARSE_NODE_IS_STRUCT_KIND(node_head, PN_star_expr)) {
EMIT_ARG(unpack_ex, 0, num_tail);
have_star_index = 0;
}
for (uint i = 0; i < num_tail; i++) {
if (MP_PARSE_NODE_IS_STRUCT_KIND(nodes_tail[i], PN_star_expr)) {
if (have_star_index == (uint)-1) {
EMIT_ARG(unpack_ex, num_head + i, num_tail - i - 1);
have_star_index = num_head + i;
} else {
compile_syntax_error(comp, nodes_tail[i], "multiple *x in assignment");
return;
}
}
}
if (have_star_index == (uint)-1) {
EMIT_ARG(unpack_sequence, num_head + num_tail);
}
if (num_head != 0) {
if (0 == have_star_index) {
c_assign(comp, ((mp_parse_node_struct_t*)node_head)->nodes[0], ASSIGN_STORE);
} else {
c_assign(comp, node_head, ASSIGN_STORE);
}
}
for (uint i = 0; i < num_tail; i++) {
if (num_head + i == have_star_index) {
c_assign(comp, ((mp_parse_node_struct_t*)nodes_tail[i])->nodes[0], ASSIGN_STORE);
} else {
c_assign(comp, nodes_tail[i], ASSIGN_STORE);
}
}
}
// assigns top of stack to pn
STATIC void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t assign_kind) {
assert(!MP_PARSE_NODE_IS_NULL(pn));
if (MP_PARSE_NODE_IS_LEAF(pn)) {
if (MP_PARSE_NODE_IS_ID(pn)) {
qstr arg = MP_PARSE_NODE_LEAF_ARG(pn);
switch (assign_kind) {
case ASSIGN_STORE:
case ASSIGN_AUG_STORE:
compile_store_id(comp, arg);
break;
case ASSIGN_AUG_LOAD:
default:
compile_load_id(comp, arg);
break;
}
} else {
compile_syntax_error(comp, pn, "can't assign to literal");
return;
}
} else {
// pn must be a struct
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
switch (MP_PARSE_NODE_STRUCT_KIND(pns)) {
case PN_atom_expr_normal:
// lhs is an index or attribute
c_assign_atom_expr(comp, pns, assign_kind);
break;
case PN_testlist_star_expr:
case PN_exprlist:
// lhs is a tuple
if (assign_kind != ASSIGN_STORE) {
goto bad_aug;
}
c_assign_tuple(comp, MP_PARSE_NODE_NULL, MP_PARSE_NODE_STRUCT_NUM_NODES(pns), pns->nodes);
break;
case PN_atom_paren:
// lhs is something in parenthesis
if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
// empty tuple
goto cannot_assign;
} else {
assert(MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp));
if (assign_kind != ASSIGN_STORE) {
goto bad_aug;
}
pns = (mp_parse_node_struct_t*)pns->nodes[0];
goto testlist_comp;
}
break;
case PN_atom_bracket:
// lhs is something in brackets
if (assign_kind != ASSIGN_STORE) {
goto bad_aug;
}
if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
// empty list, assignment allowed
c_assign_tuple(comp, MP_PARSE_NODE_NULL, 0, NULL);
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp)) {
pns = (mp_parse_node_struct_t*)pns->nodes[0];
goto testlist_comp;
} else {
// brackets around 1 item
c_assign_tuple(comp, pns->nodes[0], 0, NULL);
}
break;
default:
goto cannot_assign;
}
return;
testlist_comp:
// lhs is a sequence
if (MP_PARSE_NODE_IS_STRUCT(pns->nodes[1])) {
mp_parse_node_struct_t *pns2 = (mp_parse_node_struct_t*)pns->nodes[1];
if (MP_PARSE_NODE_STRUCT_KIND(pns2) == PN_testlist_comp_3b) {
// sequence of one item, with trailing comma
assert(MP_PARSE_NODE_IS_NULL(pns2->nodes[0]));
c_assign_tuple(comp, pns->nodes[0], 0, NULL);
} else if (MP_PARSE_NODE_STRUCT_KIND(pns2) == PN_testlist_comp_3c) {
// sequence of many items
uint n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns2);
c_assign_tuple(comp, pns->nodes[0], n, pns2->nodes);
} else if (MP_PARSE_NODE_STRUCT_KIND(pns2) == PN_comp_for) {
goto cannot_assign;
} else {
// sequence with 2 items
goto sequence_with_2_items;
}
} else {
// sequence with 2 items
sequence_with_2_items:
c_assign_tuple(comp, MP_PARSE_NODE_NULL, 2, pns->nodes);
}
return;
}
return;
cannot_assign:
compile_syntax_error(comp, pn, "can't assign to expression");
return;
bad_aug:
compile_syntax_error(comp, pn, "illegal expression for augmented assignment");
}
// stuff for lambda and comprehensions and generators:
// if n_pos_defaults > 0 then there is a tuple on the stack with the positional defaults
// if n_kw_defaults > 0 then there is a dictionary on the stack with the keyword defaults
// if both exist, the tuple is above the dictionary (ie the first pop gets the tuple)
STATIC void close_over_variables_etc(compiler_t *comp, scope_t *this_scope, int n_pos_defaults, int n_kw_defaults) {
assert(n_pos_defaults >= 0);
assert(n_kw_defaults >= 0);
// set flags
if (n_kw_defaults > 0) {
this_scope->scope_flags |= MP_SCOPE_FLAG_DEFKWARGS;
}
this_scope->num_def_pos_args = n_pos_defaults;
// make closed over variables, if any
// ensure they are closed over in the order defined in the outer scope (mainly to agree with CPython)
int nfree = 0;
if (comp->scope_cur->kind != SCOPE_MODULE) {
for (int i = 0; i < comp->scope_cur->id_info_len; i++) {
id_info_t *id = &comp->scope_cur->id_info[i];
if (id->kind == ID_INFO_KIND_CELL || id->kind == ID_INFO_KIND_FREE) {
for (int j = 0; j < this_scope->id_info_len; j++) {
id_info_t *id2 = &this_scope->id_info[j];
if (id2->kind == ID_INFO_KIND_FREE && id->qst == id2->qst) {
// in Micro Python we load closures using LOAD_FAST
EMIT_LOAD_FAST(id->qst, id->local_num);
nfree += 1;
}
}
}
}
}
// make the function/closure
if (nfree == 0) {
EMIT_ARG(make_function, this_scope, n_pos_defaults, n_kw_defaults);
} else {
EMIT_ARG(make_closure, this_scope, nfree, n_pos_defaults, n_kw_defaults);
}
}
STATIC void compile_funcdef_lambdef_param(compiler_t *comp, mp_parse_node_t pn) {
if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_typedargslist_star)
|| MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_varargslist_star)) {
comp->have_star = true;
/* don't need to distinguish bare from named star
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
// bare star
} else {
// named star
}
*/
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_typedargslist_dbl_star)
|| MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_varargslist_dbl_star)) {
// named double star
// TODO do we need to do anything with this?
} else {
mp_parse_node_t pn_id;
mp_parse_node_t pn_colon;
mp_parse_node_t pn_equal;
if (MP_PARSE_NODE_IS_ID(pn)) {
// this parameter is just an id
pn_id = pn;
pn_colon = MP_PARSE_NODE_NULL;
pn_equal = MP_PARSE_NODE_NULL;
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_typedargslist_name)) {
// this parameter has a colon and/or equal specifier
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
pn_id = pns->nodes[0];
pn_colon = pns->nodes[1];
pn_equal = pns->nodes[2];
} else {
assert(MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_varargslist_name)); // should be
// this parameter has an equal specifier
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
pn_id = pns->nodes[0];
pn_equal = pns->nodes[1];
}
if (MP_PARSE_NODE_IS_NULL(pn_equal)) {
// this parameter does not have a default value
// check for non-default parameters given after default parameters (allowed by parser, but not syntactically valid)
if (!comp->have_star && comp->num_default_params != 0) {
compile_syntax_error(comp, pn, "non-default argument follows default argument");
return;
}
} else {
// this parameter has a default value
// in CPython, None (and True, False?) as default parameters are loaded with LOAD_NAME; don't understandy why
if (comp->have_star) {
comp->num_dict_params += 1;
// in Micro Python we put the default dict parameters into a dictionary using the bytecode
if (comp->num_dict_params == 1) {
// in Micro Python we put the default positional parameters into a tuple using the bytecode
// we need to do this here before we start building the map for the default keywords
if (comp->num_default_params > 0) {
EMIT_ARG(build_tuple, comp->num_default_params);
} else {
EMIT(load_null); // sentinel indicating empty default positional args
}
// first default dict param, so make the map
EMIT_ARG(build_map, 0);
}
// compile value then key, then store it to the dict
compile_node(comp, pn_equal);
EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pn_id));
EMIT(store_map);
} else {
comp->num_default_params += 1;
compile_node(comp, pn_equal);
}
}
// TODO pn_colon not implemented
(void)pn_colon;
}
}
STATIC void compile_funcdef_lambdef(compiler_t *comp, scope_t *scope, mp_parse_node_t pn_params, pn_kind_t pn_list_kind) {
// When we call compile_funcdef_lambdef_param below it can compile an arbitrary
// expression for default arguments, which may contain a lambda. The lambda will
// call here in a nested way, so we must save and restore the relevant state.
bool orig_have_star = comp->have_star;
uint16_t orig_num_dict_params = comp->num_dict_params;
uint16_t orig_num_default_params = comp->num_default_params;
// compile default parameters
comp->have_star = false;
comp->num_dict_params = 0;
comp->num_default_params = 0;
apply_to_single_or_list(comp, pn_params, pn_list_kind, compile_funcdef_lambdef_param);
if (comp->compile_error != MP_OBJ_NULL) {
return;
}
// in Micro Python we put the default positional parameters into a tuple using the bytecode
// the default keywords args may have already made the tuple; if not, do it now
if (comp->num_default_params > 0 && comp->num_dict_params == 0) {
EMIT_ARG(build_tuple, comp->num_default_params);
EMIT(load_null); // sentinel indicating empty default keyword args
}
// make the function
close_over_variables_etc(comp, scope, comp->num_default_params, comp->num_dict_params);
// restore state
comp->have_star = orig_have_star;
comp->num_dict_params = orig_num_dict_params;
comp->num_default_params = orig_num_default_params;
}
// leaves function object on stack
// returns function name
STATIC qstr compile_funcdef_helper(compiler_t *comp, mp_parse_node_struct_t *pns, uint emit_options) {
if (comp->pass == MP_PASS_SCOPE) {
// create a new scope for this function
scope_t *s = scope_new_and_link(comp, SCOPE_FUNCTION, (mp_parse_node_t)pns, emit_options);
// store the function scope so the compiling function can use it at each pass
pns->nodes[4] = (mp_parse_node_t)s;
}
// get the scope for this function
scope_t *fscope = (scope_t*)pns->nodes[4];
// compile the function definition
compile_funcdef_lambdef(comp, fscope, pns->nodes[1], PN_typedargslist);
// return its name (the 'f' in "def f(...):")
return fscope->simple_name;
}
// leaves class object on stack
// returns class name
STATIC qstr compile_classdef_helper(compiler_t *comp, mp_parse_node_struct_t *pns, uint emit_options) {
if (comp->pass == MP_PASS_SCOPE) {
// create a new scope for this class
scope_t *s = scope_new_and_link(comp, SCOPE_CLASS, (mp_parse_node_t)pns, emit_options);
// store the class scope so the compiling function can use it at each pass
pns->nodes[3] = (mp_parse_node_t)s;
}
EMIT(load_build_class);
// scope for this class
scope_t *cscope = (scope_t*)pns->nodes[3];
// compile the class
close_over_variables_etc(comp, cscope, 0, 0);
// get its name
EMIT_ARG(load_const_str, cscope->simple_name);
// nodes[1] has parent classes, if any
// empty parenthesis (eg class C():) gets here as an empty PN_classdef_2 and needs special handling
mp_parse_node_t parents = pns->nodes[1];
if (MP_PARSE_NODE_IS_STRUCT_KIND(parents, PN_classdef_2)) {
parents = MP_PARSE_NODE_NULL;
}
comp->func_arg_is_super = false;
compile_trailer_paren_helper(comp, parents, false, 2);
// return its name (the 'C' in class C(...):")
return cscope->simple_name;
}
// returns true if it was a built-in decorator (even if the built-in had an error)
STATIC bool compile_built_in_decorator(compiler_t *comp, int name_len, mp_parse_node_t *name_nodes, uint *emit_options) {
if (MP_PARSE_NODE_LEAF_ARG(name_nodes[0]) != MP_QSTR_micropython) {
return false;
}
if (name_len != 2) {
compile_syntax_error(comp, name_nodes[0], "invalid micropython decorator");
return true;
}
qstr attr = MP_PARSE_NODE_LEAF_ARG(name_nodes[1]);
if (attr == MP_QSTR_bytecode) {
*emit_options = MP_EMIT_OPT_BYTECODE;
#if MICROPY_EMIT_NATIVE
} else if (attr == MP_QSTR_native) {
*emit_options = MP_EMIT_OPT_NATIVE_PYTHON;
} else if (attr == MP_QSTR_viper) {
*emit_options = MP_EMIT_OPT_VIPER;
#endif
#if MICROPY_EMIT_INLINE_ASM
} else if (attr == ASM_DECORATOR_QSTR) {
*emit_options = MP_EMIT_OPT_ASM;
#endif
} else {
compile_syntax_error(comp, name_nodes[1], "invalid micropython decorator");
}
return true;
}
STATIC void compile_decorated(compiler_t *comp, mp_parse_node_struct_t *pns) {
// get the list of decorators
mp_parse_node_t *nodes;
int n = mp_parse_node_extract_list(&pns->nodes[0], PN_decorators, &nodes);
// inherit emit options for this function/class definition
uint emit_options = comp->scope_cur->emit_options;
// compile each decorator
int num_built_in_decorators = 0;
for (int i = 0; i < n; i++) {
assert(MP_PARSE_NODE_IS_STRUCT_KIND(nodes[i], PN_decorator)); // should be
mp_parse_node_struct_t *pns_decorator = (mp_parse_node_struct_t*)nodes[i];
// nodes[0] contains the decorator function, which is a dotted name
mp_parse_node_t *name_nodes;
int name_len = mp_parse_node_extract_list(&pns_decorator->nodes[0], PN_dotted_name, &name_nodes);
// check for built-in decorators
if (compile_built_in_decorator(comp, name_len, name_nodes, &emit_options)) {
// this was a built-in
num_built_in_decorators += 1;
} else {
// not a built-in, compile normally
// compile the decorator function
compile_node(comp, name_nodes[0]);
for (int j = 1; j < name_len; j++) {
assert(MP_PARSE_NODE_IS_ID(name_nodes[j])); // should be
EMIT_ARG(load_attr, MP_PARSE_NODE_LEAF_ARG(name_nodes[j]));
}
// nodes[1] contains arguments to the decorator function, if any
if (!MP_PARSE_NODE_IS_NULL(pns_decorator->nodes[1])) {
// call the decorator function with the arguments in nodes[1]
comp->func_arg_is_super = false;
compile_node(comp, pns_decorator->nodes[1]);
}
}
}
// compile the body (funcdef, async funcdef or classdef) and get its name
mp_parse_node_struct_t *pns_body = (mp_parse_node_struct_t*)pns->nodes[1];
qstr body_name = 0;
if (MP_PARSE_NODE_STRUCT_KIND(pns_body) == PN_funcdef) {
body_name = compile_funcdef_helper(comp, pns_body, emit_options);
#if MICROPY_PY_ASYNC_AWAIT
} else if (MP_PARSE_NODE_STRUCT_KIND(pns_body) == PN_async_funcdef) {
assert(MP_PARSE_NODE_IS_STRUCT(pns_body->nodes[0]));
mp_parse_node_struct_t *pns0 = (mp_parse_node_struct_t*)pns_body->nodes[0];
body_name = compile_funcdef_helper(comp, pns0, emit_options);
scope_t *fscope = (scope_t*)pns0->nodes[4];
fscope->scope_flags |= MP_SCOPE_FLAG_GENERATOR;
#endif
} else {
assert(MP_PARSE_NODE_STRUCT_KIND(pns_body) == PN_classdef); // should be
body_name = compile_classdef_helper(comp, pns_body, emit_options);
}
// call each decorator
for (int i = 0; i < n - num_built_in_decorators; i++) {
EMIT_ARG(call_function, 1, 0, 0);
}
// store func/class object into name
compile_store_id(comp, body_name);
}
STATIC void compile_funcdef(compiler_t *comp, mp_parse_node_struct_t *pns) {
qstr fname = compile_funcdef_helper(comp, pns, comp->scope_cur->emit_options);
// store function object into function name
compile_store_id(comp, fname);
}
STATIC void c_del_stmt(compiler_t *comp, mp_parse_node_t pn) {
if (MP_PARSE_NODE_IS_ID(pn)) {
compile_delete_id(comp, MP_PARSE_NODE_LEAF_ARG(pn));
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_atom_expr_normal)) {
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
compile_node(comp, pns->nodes[0]); // base of the atom_expr_normal node
if (MP_PARSE_NODE_IS_STRUCT(pns->nodes[1])) {
mp_parse_node_struct_t *pns1 = (mp_parse_node_struct_t*)pns->nodes[1];
if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_atom_expr_trailers) {
int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns1);
for (int i = 0; i < n - 1; i++) {
compile_node(comp, pns1->nodes[i]);
}
assert(MP_PARSE_NODE_IS_STRUCT(pns1->nodes[n - 1]));
pns1 = (mp_parse_node_struct_t*)pns1->nodes[n - 1];
}
if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_trailer_bracket) {
compile_node(comp, pns1->nodes[0]);
EMIT(delete_subscr);
} else if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_trailer_period) {
assert(MP_PARSE_NODE_IS_ID(pns1->nodes[0]));
EMIT_ARG(delete_attr, MP_PARSE_NODE_LEAF_ARG(pns1->nodes[0]));
} else {
goto cannot_delete;
}
} else {
goto cannot_delete;
}
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_atom_paren)) {
pn = ((mp_parse_node_struct_t*)pn)->nodes[0];
if (MP_PARSE_NODE_IS_NULL(pn)) {
goto cannot_delete;
} else {
assert(MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_testlist_comp));
mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
// TODO perhaps factorise testlist_comp code with other uses of PN_testlist_comp
if (MP_PARSE_NODE_IS_STRUCT(pns->nodes[1])) {
mp_parse_node_struct_t *pns1 = (mp_parse_node_struct_t*)pns->nodes[1];
if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_testlist_comp_3b) {
// sequence of one item, with trailing comma
assert(MP_PARSE_NODE_IS_NULL(pns1->nodes[0]));
c_del_stmt(comp, pns->nodes[0]);
} else if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_testlist_comp_3c) {
// sequence of many items
int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns1);
c_del_stmt(comp, pns->nodes[0]);
for (int i = 0; i < n; i++) {
c_del_stmt(comp, pns1->nodes[i]);
}
} else if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_comp_for) {
goto cannot_delete;
} else {
// sequence with 2 items
goto sequence_with_2_items;
}
} else {
// sequence with 2 items
sequence_with_2_items:
c_del_stmt(comp, pns->nodes[0]);
c_del_stmt(comp, pns->nodes[1]);
}
}
} else {
// some arbitrary statment that we can't delete (eg del 1)
goto cannot_delete;
}
return;
cannot_delete:
compile_syntax_error(comp, (mp_parse_node_t)pn, "can't delete expression");
}
STATIC void compile_del_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
apply_to_single_or_list(comp, pns->nodes[0], PN_exprlist, c_del_stmt);
}
STATIC void compile_break_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
if (comp->break_label == 0) {
compile_syntax_error(comp, (mp_parse_node_t)pns, "'break' outside loop");
}
assert(comp->cur_except_level >= comp->break_continue_except_level);
EMIT_ARG(break_loop, comp->break_label, comp->cur_except_level - comp->break_continue_except_level);
}
STATIC void compile_continue_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
if (comp->continue_label == 0) {
compile_syntax_error(comp, (mp_parse_node_t)pns, "'continue' outside loop");
}
assert(comp->cur_except_level >= comp->break_continue_except_level);
EMIT_ARG(continue_loop, comp->continue_label, comp->cur_except_level - comp->break_continue_except_level);
}
STATIC void compile_return_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
if (comp->scope_cur->kind != SCOPE_FUNCTION) {
compile_syntax_error(comp, (mp_parse_node_t)pns, "'return' outside function");
return;
}
if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
// no argument to 'return', so return None
EMIT_ARG(load_const_tok, MP_TOKEN_KW_NONE);
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_test_if_expr)) {
// special case when returning an if-expression; to match CPython optimisation
mp_parse_node_struct_t *pns_test_if_expr = (mp_parse_node_struct_t*)pns->nodes[0];
mp_parse_node_struct_t *pns_test_if_else = (mp_parse_node_struct_t*)pns_test_if_expr->nodes[1];
uint l_fail = comp_next_label(comp);
c_if_cond(comp, pns_test_if_else->nodes[0], false, l_fail); // condition
compile_node(comp, pns_test_if_expr->nodes[0]); // success value
EMIT(return_value);
EMIT_ARG(label_assign, l_fail);
compile_node(comp, pns_test_if_else->nodes[1]); // failure value
} else {
compile_node(comp, pns->nodes[0]);
}
EMIT(return_value);
}
STATIC void compile_yield_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
compile_node(comp, pns->nodes[0]);
EMIT(pop_top);