compile.c 141 KB
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/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
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 * Copyright (c) 2013-2015 Damien P. George
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 *
 * 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.
 */

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#include <stdbool.h>
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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

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#include "py/scope.h"
#include "py/emit.h"
#include "py/compile.h"
#include "py/smallint.h"
#include "py/runtime.h"
#include "py/builtin.h"
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// TODO need to mangle __attr names

typedef enum {
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#define DEF_RULE(rule, comp, kind, ...) PN_##rule,
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#include "py/grammar.h"
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#undef DEF_RULE
    PN_maximum_number_of,
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    PN_string, // special node for non-interned string
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    PN_bytes, // special node for non-interned bytes
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    PN_const_object, // special node for a constant, generic Python object
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} pn_kind_t;

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#define NEED_METHOD_TABLE MICROPY_EMIT_NATIVE
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#if NEED_METHOD_TABLE

// we need a method table to do the lookup for the emitter functions
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#define EMIT(fun) (comp->emit_method_table->fun(comp->emit))
#define EMIT_ARG(fun, ...) (comp->emit_method_table->fun(comp->emit, __VA_ARGS__))
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#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))
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#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__))
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#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

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// elements in this struct are ordered to make it compact
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typedef struct _compiler_t {
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    qstr source_file;
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    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
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    uint8_t have_star;

    // try to keep compiler clean from nlr
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    mp_obj_t compile_error; // set to an exception object if there's an error
    mp_uint_t compile_error_line; // set to best guess of line of error
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    uint next_label;
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    uint16_t num_dict_params;
    uint16_t num_default_params;

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    uint16_t break_label; // highest bit set indicates we are breaking out of a for loop
    uint16_t continue_label;
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    uint16_t cur_except_level; // increased for SETUP_EXCEPT, SETUP_FINALLY; decreased for POP_BLOCK, POP_EXCEPT
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    uint16_t break_continue_except_level;
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    scope_t *scope_head;
    scope_t *scope_cur;

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    emit_t *emit;                                   // current emitter
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    #if NEED_METHOD_TABLE
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    const emit_method_table_t *emit_method_table;   // current emit method table
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    #endif
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    #if MICROPY_EMIT_INLINE_THUMB
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    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
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    #endif
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} compiler_t;

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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_uint_t)((mp_parse_node_struct_t*)pn)->source_line;
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    }
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}

STATIC void compile_syntax_error(compiler_t *comp, mp_parse_node_t pn, const char *msg) {
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    // 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);
    }
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}

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#if MICROPY_COMP_MODULE_CONST
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STATIC const mp_map_elem_t mp_constants_table[] = {
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    #if MICROPY_PY_UCTYPES
    { MP_OBJ_NEW_QSTR(MP_QSTR_uctypes), (mp_obj_t)&mp_module_uctypes },
    #endif
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    // Extra constants as defined by a port
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    MICROPY_PORT_CONSTANTS
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};
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STATIC MP_DEFINE_CONST_MAP(mp_constants_map, mp_constants_table);
#endif
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// this function is essentially a simple preprocessor
STATIC mp_parse_node_t fold_constants(compiler_t *comp, mp_parse_node_t pn, mp_map_t *consts) {
    if (0) {
        // dummy
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#if MICROPY_COMP_CONST
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    } else if (MP_PARSE_NODE_IS_ID(pn)) {
        // lookup identifier in table of dynamic constants
        qstr qst = MP_PARSE_NODE_LEAF_ARG(pn);
        mp_map_elem_t *elem = mp_map_lookup(consts, MP_OBJ_NEW_QSTR(qst), MP_MAP_LOOKUP);
        if (elem != NULL) {
            pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, MP_OBJ_SMALL_INT_VALUE(elem->value));
        }
#endif
    } else if (MP_PARSE_NODE_IS_STRUCT(pn)) {
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        mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
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        // fold some parse nodes before folding their arguments
        switch (MP_PARSE_NODE_STRUCT_KIND(pns)) {
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#if MICROPY_COMP_CONST
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            case PN_expr_stmt:
                if (!MP_PARSE_NODE_IS_NULL(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_expr_stmt_assign) {
                        if (MP_PARSE_NODE_IS_ID(pns->nodes[0])
                            && MP_PARSE_NODE_IS_STRUCT_KIND(pns1->nodes[0], PN_power)
                            && MP_PARSE_NODE_IS_ID(((mp_parse_node_struct_t*)pns1->nodes[0])->nodes[0])
                            && MP_PARSE_NODE_LEAF_ARG(((mp_parse_node_struct_t*)pns1->nodes[0])->nodes[0]) == MP_QSTR_const
                            && MP_PARSE_NODE_IS_STRUCT_KIND(((mp_parse_node_struct_t*)pns1->nodes[0])->nodes[1], PN_trailer_paren)
                            && MP_PARSE_NODE_IS_NULL(((mp_parse_node_struct_t*)pns1->nodes[0])->nodes[2])
                            ) {
                            // code to assign dynamic constants: id = const(value)

                            // get the id
                            qstr id_qstr = MP_PARSE_NODE_LEAF_ARG(pns->nodes[0]);

                            // get the value
                            mp_parse_node_t pn_value = ((mp_parse_node_struct_t*)((mp_parse_node_struct_t*)pns1->nodes[0])->nodes[1])->nodes[0];
                            pn_value = fold_constants(comp, pn_value, consts);
                            if (!MP_PARSE_NODE_IS_SMALL_INT(pn_value)) {
                                compile_syntax_error(comp, (mp_parse_node_t)pns, "constant must be an integer");
                                break;
                            }
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                            mp_int_t value = MP_PARSE_NODE_LEAF_SMALL_INT(pn_value);
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                            // store the value in the table of dynamic constants
                            mp_map_elem_t *elem = mp_map_lookup(consts, MP_OBJ_NEW_QSTR(id_qstr), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND);
                            if (elem->value != MP_OBJ_NULL) {
                                compile_syntax_error(comp, (mp_parse_node_t)pns, "constant redefined");
                                break;
                            }
                            elem->value = MP_OBJ_NEW_SMALL_INT(value);

                            // replace const(value) with value
                            pns1->nodes[0] = pn_value;

                            // finished folding this assignment
                            return pn;
                        }
                    }
                }
                break;
#endif
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            case PN_string:
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            case PN_bytes:
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            case PN_const_object:
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                return pn;
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        }

        // fold arguments
        int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
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        for (int i = 0; i < n; i++) {
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            pns->nodes[i] = fold_constants(comp, pns->nodes[i], consts);
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        }

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        // try to fold this parse node
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        switch (MP_PARSE_NODE_STRUCT_KIND(pns)) {
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            case PN_atom_paren:
                if (n == 1 && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[0])) {
                    // (int)
                    pn = pns->nodes[0];
                }
                break;

            case PN_expr:
                if (n == 2 && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[0]) && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[1])) {
                    // int | int
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                    mp_int_t arg0 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[0]);
                    mp_int_t arg1 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[1]);
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                    pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, arg0 | arg1);
                }
                break;

            case PN_and_expr:
                if (n == 2 && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[0]) && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[1])) {
                    // int & int
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                    mp_int_t arg0 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[0]);
                    mp_int_t arg1 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[1]);
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                    pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, arg0 & arg1);
                }
                break;

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            case PN_shift_expr:
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                if (n == 3 && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[0]) && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[2])) {
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                    mp_int_t arg0 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[0]);
                    mp_int_t arg1 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[2]);
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                    if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_DBL_LESS)) {
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                        // int << int
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                        if (!(arg1 >= (mp_int_t)BITS_PER_WORD || arg0 > (MP_SMALL_INT_MAX >> arg1) || arg0 < (MP_SMALL_INT_MIN >> arg1))) {
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                            pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, arg0 << arg1);
                        }
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                    } else {
                        assert(MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_DBL_MORE)); // should be
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                        // int >> int
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                        if (arg1 >= (mp_int_t)BITS_PER_WORD) {
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                            // Shifting to big amounts is underfined behavior
                            // in C and is CPU-dependent; propagate sign bit.
                            arg1 = BITS_PER_WORD - 1;
                        }
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                        pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, arg0 >> arg1);
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                    }
                }
                break;

            case PN_arith_expr:
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                // overflow checking here relies on SMALL_INT being strictly smaller than mp_int_t
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                if (n == 3 && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[0]) && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[2])) {
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                    mp_int_t arg0 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[0]);
                    mp_int_t arg1 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[2]);
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                    if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_PLUS)) {
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                        // int + int
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                        arg0 += arg1;
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                    } else {
                        assert(MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_MINUS)); // should be
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                        // int - int
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                        arg0 -= arg1;
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                    }
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                    if (MP_SMALL_INT_FITS(arg0)) {
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                        pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, arg0);
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                    }
                }
                break;

            case PN_term:
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                if (n == 3 && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[0]) && MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[2])) {
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                    mp_int_t arg0 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[0]);
                    mp_int_t arg1 = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[2]);
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                    if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_STAR)) {
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                        // int * int
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                        if (!mp_small_int_mul_overflow(arg0, arg1)) {
                            arg0 *= arg1;
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                            if (MP_SMALL_INT_FITS(arg0)) {
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                                pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, arg0);
                            }
                        }
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                    } else if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_SLASH)) {
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                        // int / int
                        // pass
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                    } else if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_PERCENT)) {
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                        // int%int
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                        if (arg1 != 0) {
                            pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, mp_small_int_modulo(arg0, arg1));
                        }
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                    } else {
                        assert(MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_DBL_SLASH)); // should be
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                        if (arg1 != 0) {
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                            // int // int
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                            pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, mp_small_int_floor_divide(arg0, arg1));
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                        }
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                    }
                }
                break;

            case PN_factor_2:
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                if (MP_PARSE_NODE_IS_SMALL_INT(pns->nodes[1])) {
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                    mp_int_t arg = MP_PARSE_NODE_LEAF_SMALL_INT(pns->nodes[1]);
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                    if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[0], MP_TOKEN_OP_PLUS)) {
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                        // +int
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                        pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, arg);
                    } else if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[0], MP_TOKEN_OP_MINUS)) {
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                        // -int
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                        pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, -arg);
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                    } else {
                        assert(MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[0], MP_TOKEN_OP_TILDE)); // should be
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                        // ~int
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                        pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, ~arg);
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                    }
                }
                break;

            case PN_power:
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                if (0) {
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#if MICROPY_COMP_MODULE_CONST
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                } else if (MP_PARSE_NODE_IS_ID(pns->nodes[0]) && MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[1], PN_trailer_period) && MP_PARSE_NODE_IS_NULL(pns->nodes[2])) {
                    // id.id
                    // look it up in constant table, see if it can be replaced with an integer
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                    mp_parse_node_struct_t *pns1 = (mp_parse_node_struct_t*)pns->nodes[1];
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                    assert(MP_PARSE_NODE_IS_ID(pns1->nodes[0]));
                    qstr q_base = MP_PARSE_NODE_LEAF_ARG(pns->nodes[0]);
                    qstr q_attr = MP_PARSE_NODE_LEAF_ARG(pns1->nodes[0]);
                    mp_map_elem_t *elem = mp_map_lookup((mp_map_t*)&mp_constants_map, MP_OBJ_NEW_QSTR(q_base), MP_MAP_LOOKUP);
                    if (elem != NULL) {
                        mp_obj_t dest[2];
                        mp_load_method_maybe(elem->value, q_attr, dest);
                        if (MP_OBJ_IS_SMALL_INT(dest[0]) && dest[1] == NULL) {
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                            mp_int_t val = MP_OBJ_SMALL_INT_VALUE(dest[0]);
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                            pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, val);
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                        }
                    }
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#endif
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                }
                break;
        }
    }

    return pn;
}

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STATIC void compile_trailer_paren_helper(compiler_t *comp, mp_parse_node_t pn_arglist, bool is_method_call, int n_positional_extra);
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STATIC void compile_comprehension(compiler_t *comp, mp_parse_node_struct_t *pns, scope_kind_t kind);
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STATIC void compile_node(compiler_t *comp, mp_parse_node_t pn);
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STATIC uint comp_next_label(compiler_t *comp) {
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    return comp->next_label++;
}

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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;
}

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STATIC scope_t *scope_new_and_link(compiler_t *comp, scope_kind_t kind, mp_parse_node_t pn, uint emit_options) {
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    scope_t *scope = scope_new(kind, pn, comp->source_file, emit_options);
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    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;
}

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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) {
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    if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, pn_list_kind)) {
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        mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
        int num_nodes = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
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        for (int i = 0; i < num_nodes; i++) {
            f(comp, pns->nodes[i]);
        }
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    } else if (!MP_PARSE_NODE_IS_NULL(pn)) {
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        f(comp, pn);
    }
}

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STATIC void compile_generic_all_nodes(compiler_t *comp, mp_parse_node_struct_t *pns) {
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    int num_nodes = MP_PARSE_NODE_STRUCT_NUM_NODES(pns);
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    for (int i = 0; i < num_nodes; i++) {
        compile_node(comp, pns->nodes[i]);
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        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;
        }
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    }
}

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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 {
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        #if NEED_METHOD_TABLE
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        mp_emit_common_id_op(comp->emit, &comp->emit_method_table->load_id, comp->scope_cur, qst);
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        #else
        mp_emit_common_id_op(comp->emit, &mp_emit_bc_method_table_load_id_ops, comp->scope_cur, qst);
        #endif
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    }
}

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 {
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        #if NEED_METHOD_TABLE
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        mp_emit_common_id_op(comp->emit, &comp->emit_method_table->store_id, comp->scope_cur, qst);
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        #else
        mp_emit_common_id_op(comp->emit, &mp_emit_bc_method_table_store_id_ops, comp->scope_cur, qst);
        #endif
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    }
}

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 {
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        #if NEED_METHOD_TABLE
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        mp_emit_common_id_op(comp->emit, &comp->emit_method_table->delete_id, comp->scope_cur, qst);
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        #else
        mp_emit_common_id_op(comp->emit, &mp_emit_bc_method_table_delete_id_ops, comp->scope_cur, qst);
        #endif
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    }
}

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STATIC void c_tuple(compiler_t *comp, mp_parse_node_t pn, mp_parse_node_struct_t *pns_list) {
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    int total = 0;
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    if (!MP_PARSE_NODE_IS_NULL(pn)) {
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        compile_node(comp, pn);
        total += 1;
    }
    if (pns_list != NULL) {
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        int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns_list);
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        for (int i = 0; i < n; i++) {
            compile_node(comp, pns_list->nodes[i]);
        }
        total += n;
    }
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    EMIT_ARG(build_tuple, total);
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}
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STATIC void compile_generic_tuple(compiler_t *comp, mp_parse_node_struct_t *pns) {
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    // a simple tuple expression
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    c_tuple(comp, MP_PARSE_NODE_NULL, pns);
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}

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STATIC bool node_is_const_false(mp_parse_node_t pn) {
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    return MP_PARSE_NODE_IS_TOKEN_KIND(pn, MP_TOKEN_KW_FALSE)
        || (MP_PARSE_NODE_IS_SMALL_INT(pn) && MP_PARSE_NODE_LEAF_SMALL_INT(pn) == 0);
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}

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STATIC bool node_is_const_true(mp_parse_node_t pn) {
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    return MP_PARSE_NODE_IS_TOKEN_KIND(pn, MP_TOKEN_KW_TRUE)
        || (MP_PARSE_NODE_IS_SMALL_INT(pn) && MP_PARSE_NODE_LEAF_SMALL_INT(pn) != 0);
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}

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STATIC void c_if_cond(compiler_t *comp, mp_parse_node_t pn, bool jump_if, int label) {
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    if (node_is_const_false(pn)) {
        if (jump_if == false) {
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            EMIT_ARG(jump, label);
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        }
        return;
    } else if (node_is_const_true(pn)) {
        if (jump_if == true) {
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            EMIT_ARG(jump, label);
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        }
        return;
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    } 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) {
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            if (jump_if == false) {
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            and_or_logic1:;
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                uint label2 = comp_next_label(comp);
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                for (int i = 0; i < n - 1; i++) {
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                    c_if_cond(comp, pns->nodes[i], !jump_if, label2);
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                }
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                c_if_cond(comp, pns->nodes[n - 1], jump_if, label);
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                EMIT_ARG(label_assign, label2);
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            } else {
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            and_or_logic2:
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                for (int i = 0; i < n; i++) {
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                    c_if_cond(comp, pns->nodes[i], jump_if, label);
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                }
            }
            return;
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        } else if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_and_test) {
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            if (jump_if == false) {
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                goto and_or_logic2;
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            } else {
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                goto and_or_logic1;
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            }
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        } else if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_not_test_2) {
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            c_if_cond(comp, pns->nodes[0], !jump_if, label);
            return;
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        } 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 if (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);
                }
            } else {
                // parenthesis around 1 item, is just that item
                c_if_cond(comp, pns->nodes[0], jump_if, label);
            }
            return;
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        }
    }

    // nothing special, fall back to default compiling for node and jump
    compile_node(comp, pn);
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    EMIT_ARG(pop_jump_if, jump_if, label);
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}

typedef enum { ASSIGN_STORE, ASSIGN_AUG_LOAD, ASSIGN_AUG_STORE } assign_kind_t;
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STATIC void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t kind);
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STATIC void c_assign_power(compiler_t *comp, mp_parse_node_struct_t *pns, assign_kind_t assign_kind) {
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    if (assign_kind != ASSIGN_AUG_STORE) {
        compile_node(comp, pns->nodes[0]);
    }

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    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_power_trailers) {
            int n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns1);
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            if (assign_kind != ASSIGN_AUG_STORE) {
                for (int i = 0; i < n - 1; i++) {
                    compile_node(comp, pns1->nodes[i]);
                }
            }
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            assert(MP_PARSE_NODE_IS_STRUCT(pns1->nodes[n - 1]));
            pns1 = (mp_parse_node_struct_t*)pns1->nodes[n - 1];
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        }
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        if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_trailer_bracket) {
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            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);
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                    EMIT(load_subscr);
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                } else {
                    EMIT(store_subscr);
                }
            }
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        } else if (MP_PARSE_NODE_STRUCT_KIND(pns1) == PN_trailer_period) {
            assert(MP_PARSE_NODE_IS_ID(pns1->nodes[0]));
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            if (assign_kind == ASSIGN_AUG_LOAD) {
                EMIT(dup_top);
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                EMIT_ARG(load_attr, MP_PARSE_NODE_LEAF_ARG(pns1->nodes[0]));
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            } else {
                if (assign_kind == ASSIGN_AUG_STORE) {
                    EMIT(rot_two);
                }
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                EMIT_ARG(store_attr, MP_PARSE_NODE_LEAF_ARG(pns1->nodes[0]));
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            }
        } else {
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            goto cannot_assign;
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        }
    } else {
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        goto cannot_assign;
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    }

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    if (!MP_PARSE_NODE_IS_NULL(pns->nodes[2])) {
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        goto cannot_assign;
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    }
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    return;

cannot_assign:
    compile_syntax_error(comp, (mp_parse_node_t)pns, "can't assign to expression");
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}

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// we need to allow for a caller passing in 1 initial node (node_head) followed by an array of nodes (nodes_tail)
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STATIC void c_assign_tuple(compiler_t *comp, mp_parse_node_t node_head, uint num_tail, mp_parse_node_t *nodes_tail) {
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    uint num_head = (node_head == MP_PARSE_NODE_NULL) ? 0 : 1;

    // look for star expression
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    uint have_star_index = -1;
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    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;
    }
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    for (uint i = 0; i < num_tail; i++) {
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        if (MP_PARSE_NODE_IS_STRUCT_KIND(nodes_tail[i], PN_star_expr)) {
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            if (have_star_index == (uint)-1) {
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                EMIT_ARG(unpack_ex, num_head + i, num_tail - i - 1);
                have_star_index = num_head + i;
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            } else {
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                compile_syntax_error(comp, nodes_tail[i], "multiple *x in assignment");
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                return;
            }
        }
    }
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    if (have_star_index == (uint)-1) {
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        EMIT_ARG(unpack_sequence, num_head + num_tail);
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    }
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    if (num_head != 0) {
        if (0 == have_star_index) {
            c_assign(comp, ((mp_parse_node_struct_t*)node_head)->nodes[0], ASSIGN_STORE);
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        } else {
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            c_assign(comp, node_head, ASSIGN_STORE);
        }
    }
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    for (uint i = 0; i < num_tail; i++) {
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        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);
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        }
    }
}

// assigns top of stack to pn
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STATIC void c_assign(compiler_t *comp, mp_parse_node_t pn, assign_kind_t assign_kind) {
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    tail_recursion:
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    assert(!MP_PARSE_NODE_IS_NULL(pn));
    if (MP_PARSE_NODE_IS_LEAF(pn)) {
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        if (MP_PARSE_NODE_IS_ID(pn)) {
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            qstr arg = MP_PARSE_NODE_LEAF_ARG(pn);
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            switch (assign_kind) {
                case ASSIGN_STORE:
                case ASSIGN_AUG_STORE:
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                    compile_store_id(comp, arg);
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                    break;
                case ASSIGN_AUG_LOAD:
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                default:
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                    compile_load_id(comp, arg);
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                    break;
            }
        } else {
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            compile_syntax_error(comp, pn, "can't assign to literal");
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            return;
        }
    } else {
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        // pn must be a struct
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        mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
        switch (MP_PARSE_NODE_STRUCT_KIND(pns)) {
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            case PN_power:
                // lhs is an index or attribute
                c_assign_power(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;
                }
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                c_assign_tuple(comp, MP_PARSE_NODE_NULL, MP_PARSE_NODE_STRUCT_NUM_NODES(pns), pns->nodes);
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                break;

            case PN_atom_paren:
                // lhs is something in parenthesis
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                if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
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                    // empty tuple
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                    goto cannot_assign;
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                } else if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp)) {
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                    if (assign_kind != ASSIGN_STORE) {
                        goto bad_aug;
                    }
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                    pns = (mp_parse_node_struct_t*)pns->nodes[0];
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                    goto testlist_comp;
                } else {
                    // parenthesis around 1 item, is just that item
                    pn = pns->nodes[0];
                    goto tail_recursion;
                }
                break;

            case PN_atom_bracket:
                // lhs is something in brackets
                if (assign_kind != ASSIGN_STORE) {
                    goto bad_aug;
                }
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                if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
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                    // empty list, assignment allowed
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                    c_assign_tuple(comp, MP_PARSE_NODE_NULL, 0, NULL);
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                } else if (MP_PARSE_NODE_IS_STRUCT_KIND(pns->nodes[0], PN_testlist_comp)) {
                    pns = (mp_parse_node_struct_t*)pns->nodes[0];
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                    goto testlist_comp;
                } else {
                    // brackets around 1 item
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                    c_assign_tuple(comp, pns->nodes[0], 0, NULL);
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                }
                break;

            default:
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                goto cannot_assign;
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        }
        return;

        testlist_comp:
        // lhs is a sequence
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        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) {
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                // sequence of one item, with trailing comma
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                assert(MP_PARSE_NODE_IS_NULL(pns2->nodes[0]));
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                c_assign_tuple(comp, pns->nodes[0], 0, NULL);
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            } else if (MP_PARSE_NODE_STRUCT_KIND(pns2) == PN_testlist_comp_3c) {
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                // sequence of many items
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                uint n = MP_PARSE_NODE_STRUCT_NUM_NODES(pns2);
                c_assign_tuple(comp, pns->nodes[0], n, pns2->nodes);
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            } else if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_comp_for) {
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                // TODO can we ever get here? can it be compiled?
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                goto cannot_assign;
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            } else {
                // sequence with 2 items
                goto sequence_with_2_items;
            }
        } else {
            // sequence with 2 items
            sequence_with_2_items:
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            c_assign_tuple(comp, MP_PARSE_NODE_NULL, 2, pns->nodes);
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        }
        return;
    }
    return;

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    cannot_assign:
    compile_syntax_error(comp, pn, "can't assign to expression");
    return;

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    bad_aug:
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    compile_syntax_error(comp, pn, "illegal expression for augmented assignment");
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}

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// stuff for lambda and comprehensions and generators:
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//  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)
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STATIC void close_over_variables_etc(compiler_t *comp, scope_t *this_scope, int n_pos_defaults, int n_kw_defaults) {
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    assert(n_pos_defaults >= 0);
    assert(n_kw_defaults >= 0);

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    // make closed over variables, if any
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    // ensure they are closed over in the order defined in the outer scope (mainly to agree with CPython)
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    int nfree = 0;
    if (comp->scope_cur->kind != SCOPE_MODULE) {
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        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];
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                    if (id2->kind == ID_INFO_KIND_FREE && id->qst == id2->qst) {
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                        // in Micro Python we load closures using LOAD_FAST
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                        EMIT_LOAD_FAST(id->qst, id->local_num);
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                        nfree += 1;
                    }
                }
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            }
        }
    }

    // make the function/closure
    if (nfree == 0) {
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        EMIT_ARG(make_function, this_scope, n_pos_defaults, n_kw_defaults);
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    } else {
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        EMIT_ARG(make_closure, this_scope, nfree, n_pos_defaults, n_kw_defaults);
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    }
}

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STATIC void compile_funcdef_param(compiler_t *comp, mp_parse_node_t pn) {
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    if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_typedargslist_star)) {
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        comp->have_star = true;
        /* don't need to distinguish bare from named star
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        mp_parse_node_struct_t *pns = (mp_parse_node_struct_t*)pn;
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        if (MP_PARSE_NODE_IS_NULL(pns->nodes[0])) {
            // bare star
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        } else {
            // named star
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        }
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        */
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    } else if (MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_typedargslist_dbl_star)) {
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        // named double star
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        // 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;

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        } else {
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            // this parameter has a colon and/or equal specifier

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            assert(MP_PARSE_NODE_IS_STRUCT_KIND(pn, PN_typedargslist_name)); // should be

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            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];
        }

        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)
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            if (!comp->have_star && comp->num_default_params != 0) {
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                compile_syntax_error(comp, pn, "non-default argument follows default argument");
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                return;
            }

        } else {
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            // this parameter has a default value
            // in CPython, None (and True, False?) as default parameters are loaded with LOAD_NAME; don't understandy why
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            if (comp->have_star) {
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                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) {
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                    // 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);
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                    } else {
                        EMIT(load_null); // sentinel indicating empty default positional args
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                    }
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                    // first default dict param, so make the map
                    EMIT_ARG(build_map, 0);
                }
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                // compile value then key, then store it to the dict
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                compile_node(comp, pn_equal);
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                EMIT_ARG(load_const_str, MP_PARSE_NODE_LEAF_ARG(pn_id));
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                EMIT(store_map);
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            } else {
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                comp->num_default_params += 1;
                compile_node(comp, pn_equal);
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            }
        }
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        // TODO pn_colon not implemented
        (void)pn_colon;
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    }
}

// leaves function object on stack
// returns function name
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STATIC qstr compile_funcdef_helper(compiler_t *comp, mp_parse_node_struct_t *pns, uint emit_options) {
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    if (comp->pass == MP_PASS_SCOPE) {
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        // create a new scope for this function
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        scope_t *s = scope_new_and_link(comp, SCOPE_FUNCTION, (mp_parse_node_t)pns, emit_options);
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        // store the function scope so the compiling function can use it at each pass
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        pns->nodes[4] = (mp_parse_node_t)s;
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    }

    // save variables (probably don't need to do this, since we can't have nested definitions..?)
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    uint old_have_star = comp->have_star;
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    uint old_num_dict_params = comp->num_dict_params;
    uint old_num_default_params = comp->num_default_params;
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    // compile default parameters
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    comp->have_star = false;
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    comp->num_dict_params = 0;
    comp->num_default_params = 0;
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    apply_to_single_or_list(comp, pns->nodes[1], PN_typedargslist, compile_funcdef_param);
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    if (comp->compile_error != MP_OBJ_NULL) {
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        return MP_QSTR_NULL;
    }

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    // in Micro Python we put the default positional parameters into a tuple using the bytecode
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    // 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) {
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        EMIT_ARG(build_tuple, comp->num_default_params);
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        EMIT(load_null); // sentinel indicating empty default keyword args
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    }

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    // get the scope for this function
    scope_t *fscope = (scope_t*)pns->nodes[4];

    // make the function
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    close_over_variables_etc(comp, fscope, comp->num_default_params, comp->num_dict_params);
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    // restore variables
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    comp->have_star = old_have_star;
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    comp->num_dict_params = old_num_dict_params;
    comp->num_default_params = old_num_default_params;
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    // return its name (the 'f' in "def f(...):")
    return fscope->simple_name;
}

// leaves class object on stack
// returns class name
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STATIC qstr compile_classdef_helper(compiler_t *comp, mp_parse_node_struct_t *pns, uint emit_options) {
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    if (comp->pass == MP_PASS_SCOPE) {
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        // create a new scope for this class
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        scope_t *s = scope_new_and_link(comp, SCOPE_CLASS, (mp_parse_node_t)pns, emit_options);
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        // store the class scope so the compiling function can use it at each pass
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        pns->nodes[3] = (mp_parse_node_t)s;
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    }

    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
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    EMIT_ARG(load_const_str, cscope->simple_name);
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    // nodes[1] has parent classes, if any
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    // 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;
    }
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    comp->func_arg_is_super = false;
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    compile_trailer_paren_helper(comp, parents, false, 2);
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    // return its name (the 'C' in class C(...):")
    return cscope->simple_name;
}

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// returns true if it was a built-in decorator (even if the built-in had an error)
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STATIC bool compile_built_in_decorator(compiler_t *comp, int name_len, mp_parse_node_t *name_nodes, uint *emit_options) {
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    if (MP_PARSE_NODE_LEAF_ARG(name_nodes[0]) != MP_QSTR_micropython) {
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        return false;
    }

    if (name_len != 2) {
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        compile_syntax_error(comp, name_nodes[0], "invalid micropython decorator");
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        return true;
    }

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