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emitnative.c
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 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.
*/
// Essentially normal Python has 1 type: Python objects
// Viper has more than 1 type, and is just a more complicated (a superset of) Python.
// If you declare everything in Viper as a Python object (ie omit type decls) then
// it should in principle be exactly the same as Python native.
// Having types means having more opcodes, like binary_op_nat_nat, binary_op_nat_obj etc.
// In practice we won't have a VM but rather do this in asm which is actually very minimal.
// Because it breaks strict Python equivalence it should be a completely separate
// decorator. It breaks equivalence because overflow on integers wraps around.
// It shouldn't break equivalence if you don't use the new types, but since the
// type decls might be used in normal Python for other reasons, it's probably safest,
// cleanest and clearest to make it a separate decorator.
// Actually, it does break equivalence because integers default to native integers,
// not Python objects.
// for x in l[0:8]: can be compiled into a native loop if l has pointer type
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "py/emit.h"
#include "py/nativeglue.h"
#include "py/objstr.h"
#if MICROPY_DEBUG_VERBOSE // print debugging info
#define DEBUG_PRINT (1)
#define DEBUG_printf DEBUG_printf
#else // don't print debugging info
#define DEBUG_printf(...) (void)0
#endif
#ifndef N_X64
#define N_X64 (0)
#endif
#ifndef N_X86
#define N_X86 (0)
#endif
#ifndef N_THUMB
#define N_THUMB (0)
#endif
#ifndef N_ARM
#define N_ARM (0)
#endif
#ifndef N_XTENSA
#define N_XTENSA (0)
#endif
#ifndef N_NLR_SETJMP
#define N_NLR_SETJMP (0)
#endif
#ifndef N_PRELUDE_AS_BYTES_OBJ
#define N_PRELUDE_AS_BYTES_OBJ (0)
#endif
// wrapper around everything in this file
#if N_X64 || N_X86 || N_THUMB || N_ARM || N_XTENSA || N_XTENSAWIN
// C stack layout for native functions:
// 0: nlr_buf_t [optional]
// emit->code_state_start: mp_code_state_t
// emit->stack_start: Python object stack | emit->n_state
// locals (reversed, L0 at end) |
//
// C stack layout for native generator functions:
// 0=emit->stack_start: nlr_buf_t
//
// Then REG_GENERATOR_STATE points to:
// 0=emit->code_state_start: mp_code_state_t
// emit->stack_start: Python object stack | emit->n_state
// locals (reversed, L0 at end) |
//
// C stack layout for viper functions:
// 0: nlr_buf_t [optional]
// emit->code_state_start: fun_obj, old_globals [optional]
// emit->stack_start: Python object stack | emit->n_state
// locals (reversed, L0 at end) |
// (L0-L2 may be in regs instead)
// Native emitter needs to know the following sizes and offsets of C structs (on the target):
#if MICROPY_DYNAMIC_COMPILER
#define SIZEOF_NLR_BUF (2 + mp_dynamic_compiler.nlr_buf_num_regs + 1) // the +1 is conservative in case MICROPY_ENABLE_PYSTACK enabled
#else
#define SIZEOF_NLR_BUF (sizeof(nlr_buf_t) / sizeof(uintptr_t))
#endif
#define SIZEOF_CODE_STATE (sizeof(mp_code_state_t) / sizeof(uintptr_t))
#define OFFSETOF_CODE_STATE_STATE (offsetof(mp_code_state_t, state) / sizeof(uintptr_t))
#define OFFSETOF_CODE_STATE_FUN_BC (offsetof(mp_code_state_t, fun_bc) / sizeof(uintptr_t))
#define OFFSETOF_CODE_STATE_IP (offsetof(mp_code_state_t, ip) / sizeof(uintptr_t))
#define OFFSETOF_CODE_STATE_SP (offsetof(mp_code_state_t, sp) / sizeof(uintptr_t))
#define OFFSETOF_OBJ_FUN_BC_GLOBALS (offsetof(mp_obj_fun_bc_t, globals) / sizeof(uintptr_t))
#define OFFSETOF_OBJ_FUN_BC_BYTECODE (offsetof(mp_obj_fun_bc_t, bytecode) / sizeof(uintptr_t))
#define OFFSETOF_OBJ_FUN_BC_CONST_TABLE (offsetof(mp_obj_fun_bc_t, const_table) / sizeof(uintptr_t))
// If not already defined, set parent args to same as child call registers
#ifndef REG_PARENT_RET
#define REG_PARENT_RET REG_RET
#define REG_PARENT_ARG_1 REG_ARG_1
#define REG_PARENT_ARG_2 REG_ARG_2
#define REG_PARENT_ARG_3 REG_ARG_3
#define REG_PARENT_ARG_4 REG_ARG_4
#endif
// Word index of nlr_buf_t.ret_val
#define NLR_BUF_IDX_RET_VAL (1)
// Whether the viper function needs access to fun_obj
#define NEED_FUN_OBJ(emit) ((emit)->scope->exc_stack_size > 0 \
|| ((emit)->scope->scope_flags & (MP_SCOPE_FLAG_REFGLOBALS | MP_SCOPE_FLAG_HASCONSTS)))
// Whether the native/viper function needs to be wrapped in an exception handler
#define NEED_GLOBAL_EXC_HANDLER(emit) ((emit)->scope->exc_stack_size > 0 \
|| ((emit)->scope->scope_flags & (MP_SCOPE_FLAG_GENERATOR | MP_SCOPE_FLAG_REFGLOBALS)))
// Whether registers can be used to store locals (only true if there are no
// exception handlers, because otherwise an nlr_jump will restore registers to
// their state at the start of the function and updates to locals will be lost)
#define CAN_USE_REGS_FOR_LOCALS(emit) ((emit)->scope->exc_stack_size == 0 && !(emit->scope->scope_flags & MP_SCOPE_FLAG_GENERATOR))
// Indices within the local C stack for various variables
#define LOCAL_IDX_EXC_VAL(emit) (NLR_BUF_IDX_RET_VAL)
#define LOCAL_IDX_EXC_HANDLER_PC(emit) (NLR_BUF_IDX_LOCAL_1)
#define LOCAL_IDX_EXC_HANDLER_UNWIND(emit) (NLR_BUF_IDX_LOCAL_2)
#define LOCAL_IDX_RET_VAL(emit) (NLR_BUF_IDX_LOCAL_3)
#define LOCAL_IDX_FUN_OBJ(emit) ((emit)->code_state_start + OFFSETOF_CODE_STATE_FUN_BC)
#define LOCAL_IDX_OLD_GLOBALS(emit) ((emit)->code_state_start + OFFSETOF_CODE_STATE_IP)
#define LOCAL_IDX_GEN_PC(emit) ((emit)->code_state_start + OFFSETOF_CODE_STATE_IP)
#define LOCAL_IDX_LOCAL_VAR(emit, local_num) ((emit)->stack_start + (emit)->n_state - 1 - (local_num))
#define REG_GENERATOR_STATE (REG_LOCAL_3)
#define EMIT_NATIVE_VIPER_TYPE_ERROR(emit, ...) do { \
*emit->error_slot = mp_obj_new_exception_msg_varg(&mp_type_ViperTypeError, __VA_ARGS__); \
} while (0)
typedef enum {
STACK_VALUE,
STACK_REG,
STACK_IMM,
} stack_info_kind_t;
// these enums must be distinct and the bottom 4 bits
// must correspond to the correct MP_NATIVE_TYPE_xxx value
typedef enum {
VTYPE_PYOBJ = 0x00 | MP_NATIVE_TYPE_OBJ,
VTYPE_BOOL = 0x00 | MP_NATIVE_TYPE_BOOL,
VTYPE_INT = 0x00 | MP_NATIVE_TYPE_INT,
VTYPE_UINT = 0x00 | MP_NATIVE_TYPE_UINT,
VTYPE_PTR = 0x00 | MP_NATIVE_TYPE_PTR,
VTYPE_PTR8 = 0x00 | MP_NATIVE_TYPE_PTR8,
VTYPE_PTR16 = 0x00 | MP_NATIVE_TYPE_PTR16,
VTYPE_PTR32 = 0x00 | MP_NATIVE_TYPE_PTR32,
VTYPE_PTR_NONE = 0x50 | MP_NATIVE_TYPE_PTR,
VTYPE_UNBOUND = 0x60 | MP_NATIVE_TYPE_OBJ,
VTYPE_BUILTIN_CAST = 0x70 | MP_NATIVE_TYPE_OBJ,
} vtype_kind_t;
STATIC qstr vtype_to_qstr(vtype_kind_t vtype) {
switch (vtype) {
case VTYPE_PYOBJ:
return MP_QSTR_object;
case VTYPE_BOOL:
return MP_QSTR_bool;
case VTYPE_INT:
return MP_QSTR_int;
case VTYPE_UINT:
return MP_QSTR_uint;
case VTYPE_PTR:
return MP_QSTR_ptr;
case VTYPE_PTR8:
return MP_QSTR_ptr8;
case VTYPE_PTR16:
return MP_QSTR_ptr16;
case VTYPE_PTR32:
return MP_QSTR_ptr32;
case VTYPE_PTR_NONE:
default:
return MP_QSTR_None;
}
}
typedef struct _stack_info_t {
vtype_kind_t vtype;
stack_info_kind_t kind;
union {
int u_reg;
mp_int_t u_imm;
} data;
} stack_info_t;
#define UNWIND_LABEL_UNUSED (0x7fff)
#define UNWIND_LABEL_DO_FINAL_UNWIND (0x7ffe)
typedef struct _exc_stack_entry_t {
uint16_t label : 15;
uint16_t is_finally : 1;
uint16_t unwind_label : 15;
uint16_t is_active : 1;
} exc_stack_entry_t;
struct _emit_t {
mp_obj_t *error_slot;
uint *label_slot;
uint exit_label;
int pass;
bool do_viper_types;
bool prelude_offset_uses_u16_encoding;
mp_uint_t local_vtype_alloc;
vtype_kind_t *local_vtype;
mp_uint_t stack_info_alloc;
stack_info_t *stack_info;
vtype_kind_t saved_stack_vtype;
size_t exc_stack_alloc;
size_t exc_stack_size;
exc_stack_entry_t *exc_stack;
int prelude_offset;
int start_offset;
int n_state;
uint16_t code_state_start;
uint16_t stack_start;
int stack_size;
uint16_t n_cell;
uint16_t const_table_cur_obj;
uint16_t const_table_num_obj;
uint16_t const_table_cur_raw_code;
mp_uint_t *const_table;
#if MICROPY_PERSISTENT_CODE_SAVE
uint16_t qstr_link_cur;
mp_qstr_link_entry_t *qstr_link;
#endif
bool last_emit_was_return_value;
scope_t *scope;
ASM_T *as;
};
STATIC const uint8_t reg_local_table[REG_LOCAL_NUM] = {REG_LOCAL_1, REG_LOCAL_2, REG_LOCAL_3};
STATIC void emit_native_global_exc_entry(emit_t *emit);
STATIC void emit_native_global_exc_exit(emit_t *emit);
STATIC void emit_native_load_const_obj(emit_t *emit, mp_obj_t obj);
emit_t *EXPORT_FUN(new)(mp_obj_t * error_slot, uint *label_slot, mp_uint_t max_num_labels) {
emit_t *emit = m_new0(emit_t, 1);
emit->error_slot = error_slot;
emit->label_slot = label_slot;
emit->stack_info_alloc = 8;
emit->stack_info = m_new(stack_info_t, emit->stack_info_alloc);
emit->exc_stack_alloc = 8;
emit->exc_stack = m_new(exc_stack_entry_t, emit->exc_stack_alloc);
emit->as = m_new0(ASM_T, 1);
mp_asm_base_init(&emit->as->base, max_num_labels);
return emit;
}
void EXPORT_FUN(free)(emit_t * emit) {
mp_asm_base_deinit(&emit->as->base, false);
m_del_obj(ASM_T, emit->as);
m_del(exc_stack_entry_t, emit->exc_stack, emit->exc_stack_alloc);
m_del(vtype_kind_t, emit->local_vtype, emit->local_vtype_alloc);
m_del(stack_info_t, emit->stack_info, emit->stack_info_alloc);
m_del_obj(emit_t, emit);
}
STATIC void emit_call_with_imm_arg(emit_t *emit, mp_fun_kind_t fun_kind, mp_int_t arg_val, int arg_reg);
STATIC void emit_native_mov_reg_const(emit_t *emit, int reg_dest, int const_val) {
ASM_LOAD_REG_REG_OFFSET(emit->as, reg_dest, REG_FUN_TABLE, const_val);
}
STATIC void emit_native_mov_state_reg(emit_t *emit, int local_num, int reg_src) {
if (emit->scope->scope_flags & MP_SCOPE_FLAG_GENERATOR) {
ASM_STORE_REG_REG_OFFSET(emit->as, reg_src, REG_GENERATOR_STATE, local_num);
} else {
ASM_MOV_LOCAL_REG(emit->as, local_num, reg_src);
}
}
STATIC void emit_native_mov_reg_state(emit_t *emit, int reg_dest, int local_num) {
if (emit->scope->scope_flags & MP_SCOPE_FLAG_GENERATOR) {
ASM_LOAD_REG_REG_OFFSET(emit->as, reg_dest, REG_GENERATOR_STATE, local_num);
} else {
ASM_MOV_REG_LOCAL(emit->as, reg_dest, local_num);
}
}
STATIC void emit_native_mov_reg_state_addr(emit_t *emit, int reg_dest, int local_num) {
if (emit->scope->scope_flags & MP_SCOPE_FLAG_GENERATOR) {
ASM_MOV_REG_IMM(emit->as, reg_dest, local_num * ASM_WORD_SIZE);
ASM_ADD_REG_REG(emit->as, reg_dest, REG_GENERATOR_STATE);
} else {
ASM_MOV_REG_LOCAL_ADDR(emit->as, reg_dest, local_num);
}
}
STATIC void emit_native_mov_reg_qstr(emit_t *emit, int arg_reg, qstr qst) {
#if MICROPY_PERSISTENT_CODE_SAVE
size_t loc = ASM_MOV_REG_IMM_FIX_U16(emit->as, arg_reg, qst);
size_t link_idx = emit->qstr_link_cur++;
if (emit->pass == MP_PASS_EMIT) {
emit->qstr_link[link_idx].off = loc << 2 | 1;
emit->qstr_link[link_idx].qst = qst;
}
#else
ASM_MOV_REG_IMM(emit->as, arg_reg, qst);
#endif
}
STATIC void emit_native_mov_reg_qstr_obj(emit_t *emit, int reg_dest, qstr qst) {
#if MICROPY_PERSISTENT_CODE_SAVE
size_t loc = ASM_MOV_REG_IMM_FIX_WORD(emit->as, reg_dest, (mp_uint_t)MP_OBJ_NEW_QSTR(qst));
size_t link_idx = emit->qstr_link_cur++;
if (emit->pass == MP_PASS_EMIT) {
emit->qstr_link[link_idx].off = loc << 2 | 2;
emit->qstr_link[link_idx].qst = qst;
}
#else
ASM_MOV_REG_IMM(emit->as, reg_dest, (mp_uint_t)MP_OBJ_NEW_QSTR(qst));
#endif
}
#define emit_native_mov_state_imm_via(emit, local_num, imm, reg_temp) \
do { \
ASM_MOV_REG_IMM((emit)->as, (reg_temp), (imm)); \
emit_native_mov_state_reg((emit), (local_num), (reg_temp)); \
} while (false)
#define emit_native_mov_state_imm_fix_u16_via(emit, local_num, imm, reg_temp) \
do { \
ASM_MOV_REG_IMM_FIX_U16((emit)->as, (reg_temp), (imm)); \
emit_native_mov_state_reg((emit), (local_num), (reg_temp)); \
} while (false)
#define emit_native_mov_state_imm_fix_word_via(emit, local_num, imm, reg_temp) \
do { \
ASM_MOV_REG_IMM_FIX_WORD((emit)->as, (reg_temp), (imm)); \
emit_native_mov_state_reg((emit), (local_num), (reg_temp)); \
} while (false)
STATIC void emit_native_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scope) {
DEBUG_printf("start_pass(pass=%u, scope=%p)\n", pass, scope);
emit->pass = pass;
emit->do_viper_types = scope->emit_options == MP_EMIT_OPT_VIPER;
emit->stack_size = 0;
#if N_PRELUDE_AS_BYTES_OBJ
emit->const_table_cur_obj = emit->do_viper_types ? 0 : 1; // reserve first obj for prelude bytes obj
#else
emit->const_table_cur_obj = 0;
#endif
emit->const_table_cur_raw_code = 0;
#if MICROPY_PERSISTENT_CODE_SAVE
emit->qstr_link_cur = 0;
#endif
emit->last_emit_was_return_value = false;
emit->scope = scope;
// allocate memory for keeping track of the types of locals
if (emit->local_vtype_alloc < scope->num_locals) {
emit->local_vtype = m_renew(vtype_kind_t, emit->local_vtype, emit->local_vtype_alloc, scope->num_locals);
emit->local_vtype_alloc = scope->num_locals;
}
// set default type for arguments
mp_uint_t num_args = emit->scope->num_pos_args + emit->scope->num_kwonly_args;
if (scope->scope_flags & MP_SCOPE_FLAG_VARARGS) {
num_args += 1;
}
if (scope->scope_flags & MP_SCOPE_FLAG_VARKEYWORDS) {
num_args += 1;
}
for (mp_uint_t i = 0; i < num_args; i++) {
emit->local_vtype[i] = VTYPE_PYOBJ;
}
// Set viper type for arguments
if (emit->do_viper_types) {
for (int i = 0; i < emit->scope->id_info_len; ++i) {
id_info_t *id = &emit->scope->id_info[i];
if (id->flags & ID_FLAG_IS_PARAM) {
assert(id->local_num < emit->local_vtype_alloc);
emit->local_vtype[id->local_num] = id->flags >> ID_FLAG_VIPER_TYPE_POS;
}
}
}
// local variables begin unbound, and have unknown type
for (mp_uint_t i = num_args; i < emit->local_vtype_alloc; i++) {
emit->local_vtype[i] = VTYPE_UNBOUND;
}
// values on stack begin unbound
for (mp_uint_t i = 0; i < emit->stack_info_alloc; i++) {
emit->stack_info[i].kind = STACK_VALUE;
emit->stack_info[i].vtype = VTYPE_UNBOUND;
}
mp_asm_base_start_pass(&emit->as->base, pass == MP_PASS_EMIT ? MP_ASM_PASS_EMIT : MP_ASM_PASS_COMPUTE);
// generate code for entry to function
// Work out start of code state (mp_code_state_t or reduced version for viper)
emit->code_state_start = 0;
if (NEED_GLOBAL_EXC_HANDLER(emit)) {
emit->code_state_start = SIZEOF_NLR_BUF;
}
if (emit->do_viper_types) {
// Work out size of state (locals plus stack)
// n_state counts all stack and locals, even those in registers
emit->n_state = scope->num_locals + scope->stack_size;
int num_locals_in_regs = 0;
if (CAN_USE_REGS_FOR_LOCALS(emit)) {
num_locals_in_regs = scope->num_locals;
if (num_locals_in_regs > REG_LOCAL_NUM) {
num_locals_in_regs = REG_LOCAL_NUM;
}
// Need a spot for REG_LOCAL_3 if 4 or more args (see below)
if (scope->num_pos_args >= 4) {
--num_locals_in_regs;
}
}
// Work out where the locals and Python stack start within the C stack
if (NEED_GLOBAL_EXC_HANDLER(emit)) {
// Reserve 2 words for function object and old globals
emit->stack_start = emit->code_state_start + 2;
} else if (scope->scope_flags & MP_SCOPE_FLAG_HASCONSTS) {
// Reserve 1 word for function object, to access const table
emit->stack_start = emit->code_state_start + 1;
} else {
emit->stack_start = emit->code_state_start + 0;
}
// Entry to function
ASM_ENTRY(emit->as, emit->stack_start + emit->n_state - num_locals_in_regs);
#if N_X86
asm_x86_mov_arg_to_r32(emit->as, 0, REG_PARENT_ARG_1);
#endif
// Load REG_FUN_TABLE with a pointer to mp_fun_table, found in the const_table
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_LOCAL_3, REG_PARENT_ARG_1, OFFSETOF_OBJ_FUN_BC_CONST_TABLE);
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_FUN_TABLE, REG_LOCAL_3, 0);
// Store function object (passed as first arg) to stack if needed
if (NEED_FUN_OBJ(emit)) {
ASM_MOV_LOCAL_REG(emit->as, LOCAL_IDX_FUN_OBJ(emit), REG_PARENT_ARG_1);
}
// Put n_args in REG_ARG_1, n_kw in REG_ARG_2, args array in REG_LOCAL_3
#if N_X86
asm_x86_mov_arg_to_r32(emit->as, 1, REG_ARG_1);
asm_x86_mov_arg_to_r32(emit->as, 2, REG_ARG_2);
asm_x86_mov_arg_to_r32(emit->as, 3, REG_LOCAL_3);
#else
ASM_MOV_REG_REG(emit->as, REG_ARG_1, REG_PARENT_ARG_2);
ASM_MOV_REG_REG(emit->as, REG_ARG_2, REG_PARENT_ARG_3);
ASM_MOV_REG_REG(emit->as, REG_LOCAL_3, REG_PARENT_ARG_4);
#endif
// Check number of args matches this function, and call mp_arg_check_num_sig if not
ASM_JUMP_IF_REG_NONZERO(emit->as, REG_ARG_2, *emit->label_slot + 4, true);
ASM_MOV_REG_IMM(emit->as, REG_ARG_3, scope->num_pos_args);
ASM_JUMP_IF_REG_EQ(emit->as, REG_ARG_1, REG_ARG_3, *emit->label_slot + 5);
mp_asm_base_label_assign(&emit->as->base, *emit->label_slot + 4);
ASM_MOV_REG_IMM(emit->as, REG_ARG_3, MP_OBJ_FUN_MAKE_SIG(scope->num_pos_args, scope->num_pos_args, false));
ASM_CALL_IND(emit->as, MP_F_ARG_CHECK_NUM_SIG);
mp_asm_base_label_assign(&emit->as->base, *emit->label_slot + 5);
// Store arguments into locals (reg or stack), converting to native if needed
for (int i = 0; i < emit->scope->num_pos_args; i++) {
int r = REG_ARG_1;
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_ARG_1, REG_LOCAL_3, i);
if (emit->local_vtype[i] != VTYPE_PYOBJ) {
emit_call_with_imm_arg(emit, MP_F_CONVERT_OBJ_TO_NATIVE, emit->local_vtype[i], REG_ARG_2);
r = REG_RET;
}
// REG_LOCAL_3 points to the args array so be sure not to overwrite it if it's still needed
if (i < REG_LOCAL_NUM && CAN_USE_REGS_FOR_LOCALS(emit) && (i != 2 || emit->scope->num_pos_args == 3)) {
ASM_MOV_REG_REG(emit->as, reg_local_table[i], r);
} else {
emit_native_mov_state_reg(emit, LOCAL_IDX_LOCAL_VAR(emit, i), r);
}
}
// Get 3rd local from the stack back into REG_LOCAL_3 if this reg couldn't be written to above
if (emit->scope->num_pos_args >= 4 && CAN_USE_REGS_FOR_LOCALS(emit)) {
ASM_MOV_REG_LOCAL(emit->as, REG_LOCAL_3, LOCAL_IDX_LOCAL_VAR(emit, 2));
}
emit_native_global_exc_entry(emit);
} else {
// work out size of state (locals plus stack)
emit->n_state = scope->num_locals + scope->stack_size;
if (emit->scope->scope_flags & MP_SCOPE_FLAG_GENERATOR) {
emit->code_state_start = 0;
emit->stack_start = SIZEOF_CODE_STATE;
#if N_PRELUDE_AS_BYTES_OBJ
// Load index of prelude bytes object in const_table
mp_asm_base_data(&emit->as->base, ASM_WORD_SIZE, (uintptr_t)(emit->scope->num_pos_args + emit->scope->num_kwonly_args + 1));
#else
mp_asm_base_data(&emit->as->base, ASM_WORD_SIZE, (uintptr_t)emit->prelude_offset);
#endif
mp_asm_base_data(&emit->as->base, ASM_WORD_SIZE, (uintptr_t)emit->start_offset);
ASM_ENTRY(emit->as, SIZEOF_NLR_BUF);
// Put address of code_state into REG_GENERATOR_STATE
#if N_X86
asm_x86_mov_arg_to_r32(emit->as, 0, REG_GENERATOR_STATE);
#else
ASM_MOV_REG_REG(emit->as, REG_GENERATOR_STATE, REG_PARENT_ARG_1);
#endif
// Put throw value into LOCAL_IDX_EXC_VAL slot, for yield/yield-from
#if N_X86
asm_x86_mov_arg_to_r32(emit->as, 1, REG_PARENT_ARG_2);
#endif
ASM_MOV_LOCAL_REG(emit->as, LOCAL_IDX_EXC_VAL(emit), REG_PARENT_ARG_2);
// Load REG_FUN_TABLE with a pointer to mp_fun_table, found in the const_table
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_TEMP0, REG_GENERATOR_STATE, LOCAL_IDX_FUN_OBJ(emit));
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_TEMP0, REG_TEMP0, OFFSETOF_OBJ_FUN_BC_CONST_TABLE);
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_FUN_TABLE, REG_TEMP0, emit->scope->num_pos_args + emit->scope->num_kwonly_args);
} else {
// The locals and stack start after the code_state structure
emit->stack_start = emit->code_state_start + SIZEOF_CODE_STATE;
// Allocate space on C-stack for code_state structure, which includes state
ASM_ENTRY(emit->as, emit->stack_start + emit->n_state);
// Prepare incoming arguments for call to mp_setup_code_state
#if N_X86
asm_x86_mov_arg_to_r32(emit->as, 0, REG_PARENT_ARG_1);
asm_x86_mov_arg_to_r32(emit->as, 1, REG_PARENT_ARG_2);
asm_x86_mov_arg_to_r32(emit->as, 2, REG_PARENT_ARG_3);
asm_x86_mov_arg_to_r32(emit->as, 3, REG_PARENT_ARG_4);
#endif
// Load REG_FUN_TABLE with a pointer to mp_fun_table, found in the const_table
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_LOCAL_3, REG_PARENT_ARG_1, OFFSETOF_OBJ_FUN_BC_CONST_TABLE);
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_FUN_TABLE, REG_LOCAL_3, emit->scope->num_pos_args + emit->scope->num_kwonly_args);
// Set code_state.fun_bc
ASM_MOV_LOCAL_REG(emit->as, LOCAL_IDX_FUN_OBJ(emit), REG_PARENT_ARG_1);
// Set code_state.ip (offset from start of this function to prelude info)
int code_state_ip_local = emit->code_state_start + OFFSETOF_CODE_STATE_IP;
#if N_PRELUDE_AS_BYTES_OBJ
// Prelude is a bytes object in const_table; store ip = prelude->data - fun_bc->bytecode
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_LOCAL_3, REG_LOCAL_3, emit->scope->num_pos_args + emit->scope->num_kwonly_args + 1);
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_LOCAL_3, REG_LOCAL_3, offsetof(mp_obj_str_t, data) / sizeof(uintptr_t));
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_PARENT_ARG_1, REG_PARENT_ARG_1, OFFSETOF_OBJ_FUN_BC_BYTECODE);
ASM_SUB_REG_REG(emit->as, REG_LOCAL_3, REG_PARENT_ARG_1);
emit_native_mov_state_reg(emit, code_state_ip_local, REG_LOCAL_3);
#else
if (emit->pass == MP_PASS_CODE_SIZE) {
// Commit to the encoding size based on the value of prelude_offset in this pass.
// By using 32768 as the cut-off it is highly unlikely that prelude_offset will
// grow beyond 65535 by the end of thiss pass, and so require the larger encoding.
emit->prelude_offset_uses_u16_encoding = emit->prelude_offset < 32768;
}
if (emit->prelude_offset_uses_u16_encoding) {
assert(emit->prelude_offset <= 65535);
emit_native_mov_state_imm_fix_u16_via(emit, code_state_ip_local, emit->prelude_offset, REG_PARENT_ARG_1);
} else {
emit_native_mov_state_imm_fix_word_via(emit, code_state_ip_local, emit->prelude_offset, REG_PARENT_ARG_1);
}
#endif
// Set code_state.n_state (only works on little endian targets due to n_state being uint16_t)
emit_native_mov_state_imm_via(emit, emit->code_state_start + offsetof(mp_code_state_t, n_state) / sizeof(uintptr_t), emit->n_state, REG_ARG_1);
// Put address of code_state into first arg
ASM_MOV_REG_LOCAL_ADDR(emit->as, REG_ARG_1, emit->code_state_start);
// Copy next 3 args if needed
#if REG_ARG_2 != REG_PARENT_ARG_2
ASM_MOV_REG_REG(emit->as, REG_ARG_2, REG_PARENT_ARG_2);
#endif
#if REG_ARG_3 != REG_PARENT_ARG_3
ASM_MOV_REG_REG(emit->as, REG_ARG_3, REG_PARENT_ARG_3);
#endif
#if REG_ARG_4 != REG_PARENT_ARG_4
ASM_MOV_REG_REG(emit->as, REG_ARG_4, REG_PARENT_ARG_4);
#endif
// Call mp_setup_code_state to prepare code_state structure
#if N_THUMB
asm_thumb_bl_ind(emit->as, MP_F_SETUP_CODE_STATE, ASM_THUMB_REG_R4);
#elif N_ARM
asm_arm_bl_ind(emit->as, MP_F_SETUP_CODE_STATE, ASM_ARM_REG_R4);
#else
ASM_CALL_IND(emit->as, MP_F_SETUP_CODE_STATE);
#endif
}
emit_native_global_exc_entry(emit);
// cache some locals in registers, but only if no exception handlers
if (CAN_USE_REGS_FOR_LOCALS(emit)) {
for (int i = 0; i < REG_LOCAL_NUM && i < scope->num_locals; ++i) {
ASM_MOV_REG_LOCAL(emit->as, reg_local_table[i], LOCAL_IDX_LOCAL_VAR(emit, i));
}
}
// set the type of closed over variables
for (mp_uint_t i = 0; i < scope->id_info_len; i++) {
id_info_t *id = &scope->id_info[i];
if (id->kind == ID_INFO_KIND_CELL) {
emit->local_vtype[id->local_num] = VTYPE_PYOBJ;
}
}
if (pass == MP_PASS_EMIT) {
// write argument names as qstr objects
// see comment in corresponding part of emitbc.c about the logic here
for (int i = 0; i < scope->num_pos_args + scope->num_kwonly_args; i++) {
qstr qst = MP_QSTR__star_;
for (int j = 0; j < scope->id_info_len; ++j) {
id_info_t *id = &scope->id_info[j];
if ((id->flags & ID_FLAG_IS_PARAM) && id->local_num == i) {
qst = id->qst;
break;
}
}
emit->const_table[i] = (mp_uint_t)MP_OBJ_NEW_QSTR(qst);
}
}
}
}
static inline void emit_native_write_code_info_byte(emit_t *emit, byte val) {
mp_asm_base_data(&emit->as->base, 1, val);
}
STATIC void emit_native_end_pass(emit_t *emit) {
emit_native_global_exc_exit(emit);
if (!emit->do_viper_types) {
emit->prelude_offset = mp_asm_base_get_code_pos(&emit->as->base);
size_t n_state = emit->n_state;
size_t n_exc_stack = 0; // exc-stack not needed for native code
MP_BC_PRELUDE_SIG_ENCODE(n_state, n_exc_stack, emit->scope, emit_native_write_code_info_byte, emit);
#if MICROPY_PERSISTENT_CODE
size_t n_info = 4;
#else
size_t n_info = 1;
#endif
MP_BC_PRELUDE_SIZE_ENCODE(n_info, emit->n_cell, emit_native_write_code_info_byte, emit);
#if MICROPY_PERSISTENT_CODE
mp_asm_base_data(&emit->as->base, 1, emit->scope->simple_name);
mp_asm_base_data(&emit->as->base, 1, emit->scope->simple_name >> 8);
mp_asm_base_data(&emit->as->base, 1, emit->scope->source_file);
mp_asm_base_data(&emit->as->base, 1, emit->scope->source_file >> 8);
#else
mp_asm_base_data(&emit->as->base, 1, 1);
#endif
// bytecode prelude: initialise closed over variables
size_t cell_start = mp_asm_base_get_code_pos(&emit->as->base);
for (int i = 0; i < emit->scope->id_info_len; i++) {
id_info_t *id = &emit->scope->id_info[i];
if (id->kind == ID_INFO_KIND_CELL) {
assert(id->local_num <= 255);
mp_asm_base_data(&emit->as->base, 1, id->local_num); // write the local which should be converted to a cell
}
}
emit->n_cell = mp_asm_base_get_code_pos(&emit->as->base) - cell_start;
#if N_PRELUDE_AS_BYTES_OBJ
// Prelude bytes object is after qstr arg names and mp_fun_table
size_t table_off = emit->scope->num_pos_args + emit->scope->num_kwonly_args + 1;
if (emit->pass == MP_PASS_EMIT) {
void *buf = emit->as->base.code_base + emit->prelude_offset;
size_t n = emit->as->base.code_offset - emit->prelude_offset;
emit->const_table[table_off] = (uintptr_t)mp_obj_new_bytes(buf, n);
}
#endif
}
ASM_END_PASS(emit->as);
// check stack is back to zero size
assert(emit->stack_size == 0);
assert(emit->exc_stack_size == 0);
// Deal with const table accounting
assert(emit->pass <= MP_PASS_STACK_SIZE || (emit->const_table_num_obj == emit->const_table_cur_obj));
emit->const_table_num_obj = emit->const_table_cur_obj;
if (emit->pass == MP_PASS_CODE_SIZE) {
size_t const_table_alloc = 1 + emit->const_table_num_obj + emit->const_table_cur_raw_code;
size_t nqstr = 0;
if (!emit->do_viper_types) {
// Add room for qstr names of arguments
nqstr = emit->scope->num_pos_args + emit->scope->num_kwonly_args;
const_table_alloc += nqstr;
}
emit->const_table = m_new(mp_uint_t, const_table_alloc);
#if !MICROPY_DYNAMIC_COMPILER
// Store mp_fun_table pointer just after qstrs
// (but in dynamic-compiler mode eliminate dependency on mp_fun_table)
emit->const_table[nqstr] = (mp_uint_t)(uintptr_t)&mp_fun_table;
#endif
#if MICROPY_PERSISTENT_CODE_SAVE
size_t qstr_link_alloc = emit->qstr_link_cur;
if (qstr_link_alloc > 0) {
emit->qstr_link = m_new(mp_qstr_link_entry_t, qstr_link_alloc);
}
#endif
}
if (emit->pass == MP_PASS_EMIT) {
void *f = mp_asm_base_get_code(&emit->as->base);
mp_uint_t f_len = mp_asm_base_get_code_size(&emit->as->base);
mp_emit_glue_assign_native(emit->scope->raw_code,
emit->do_viper_types ? MP_CODE_NATIVE_VIPER : MP_CODE_NATIVE_PY,
f, f_len, emit->const_table,
#if MICROPY_PERSISTENT_CODE_SAVE
emit->prelude_offset,
emit->const_table_cur_obj, emit->const_table_cur_raw_code,
emit->qstr_link_cur, emit->qstr_link,
#endif
emit->scope->num_pos_args, emit->scope->scope_flags, 0);
}
}
STATIC bool emit_native_last_emit_was_return_value(emit_t *emit) {
return emit->last_emit_was_return_value;
}
STATIC void ensure_extra_stack(emit_t *emit, size_t delta) {
if (emit->stack_size + delta > emit->stack_info_alloc) {
size_t new_alloc = (emit->stack_size + delta + 8) & ~3;
emit->stack_info = m_renew(stack_info_t, emit->stack_info, emit->stack_info_alloc, new_alloc);
emit->stack_info_alloc = new_alloc;
}
}
STATIC void adjust_stack(emit_t *emit, mp_int_t stack_size_delta) {
assert((mp_int_t)emit->stack_size + stack_size_delta >= 0);
assert((mp_int_t)emit->stack_size + stack_size_delta <= (mp_int_t)emit->stack_info_alloc);
emit->stack_size += stack_size_delta;
if (emit->pass > MP_PASS_SCOPE && emit->stack_size > emit->scope->stack_size) {
emit->scope->stack_size = emit->stack_size;
}
#ifdef DEBUG_PRINT
DEBUG_printf(" adjust_stack; stack_size=%d+%d; stack now:", emit->stack_size - stack_size_delta, stack_size_delta);
for (int i = 0; i < emit->stack_size; i++) {
stack_info_t *si = &emit->stack_info[i];
DEBUG_printf(" (v=%d k=%d %d)", si->vtype, si->kind, si->data.u_reg);
}
DEBUG_printf("\n");
#endif
}
STATIC void emit_native_adjust_stack_size(emit_t *emit, mp_int_t delta) {
DEBUG_printf("adjust_stack_size(" INT_FMT ")\n", delta);
if (delta > 0) {
ensure_extra_stack(emit, delta);
}
// If we are adjusting the stack in a positive direction (pushing) then we
// need to fill in values for the stack kind and vtype of the newly-pushed
// entries. These should be set to "value" (ie not reg or imm) because we
// should only need to adjust the stack due to a jump to this part in the
// code (and hence we have settled the stack before the jump).
for (mp_int_t i = 0; i < delta; i++) {
stack_info_t *si = &emit->stack_info[emit->stack_size + i];
si->kind = STACK_VALUE;
// TODO we don't know the vtype to use here. At the moment this is a
// hack to get the case of multi comparison working.
if (delta == 1) {
si->vtype = emit->saved_stack_vtype;
} else {
si->vtype = VTYPE_PYOBJ;
}
}
adjust_stack(emit, delta);
}
STATIC void emit_native_set_source_line(emit_t *emit, mp_uint_t source_line) {
(void)emit;
(void)source_line;
}
// this must be called at start of emit functions
STATIC void emit_native_pre(emit_t *emit) {
emit->last_emit_was_return_value = false;
}
// depth==0 is top, depth==1 is before top, etc
STATIC stack_info_t *peek_stack(emit_t *emit, mp_uint_t depth) {
return &emit->stack_info[emit->stack_size - 1 - depth];
}
// depth==0 is top, depth==1 is before top, etc
STATIC vtype_kind_t peek_vtype(emit_t *emit, mp_uint_t depth) {
if (emit->do_viper_types) {
return peek_stack(emit, depth)->vtype;
} else {
// Type is always PYOBJ even if the intermediate stored value is not
return VTYPE_PYOBJ;
}
}
// pos=1 is TOS, pos=2 is next, etc
// use pos=0 for no skipping
STATIC void need_reg_single(emit_t *emit, int reg_needed, int skip_stack_pos) {
skip_stack_pos = emit->stack_size - skip_stack_pos;
for (int i = 0; i < emit->stack_size; i++) {
if (i != skip_stack_pos) {
stack_info_t *si = &emit->stack_info[i];
if (si->kind == STACK_REG && si->data.u_reg == reg_needed) {
si->kind = STACK_VALUE;
emit_native_mov_state_reg(emit, emit->stack_start + i, si->data.u_reg);
}
}
}
}
// Ensures all unsettled registers that hold Python values are copied to the
// concrete Python stack. All registers are then free to use.
STATIC void need_reg_all(emit_t *emit) {
for (int i = 0; i < emit->stack_size; i++) {
stack_info_t *si = &emit->stack_info[i];
if (si->kind == STACK_REG) {
DEBUG_printf(" reg(%u) to local(%u)\n", si->data.u_reg, emit->stack_start + i);
si->kind = STACK_VALUE;
emit_native_mov_state_reg(emit, emit->stack_start + i, si->data.u_reg);
}
}
}
STATIC vtype_kind_t load_reg_stack_imm(emit_t *emit, int reg_dest, const stack_info_t *si, bool convert_to_pyobj) {
if (!convert_to_pyobj && emit->do_viper_types) {
ASM_MOV_REG_IMM(emit->as, reg_dest, si->data.u_imm);
return si->vtype;
} else {
if (si->vtype == VTYPE_PYOBJ) {
ASM_MOV_REG_IMM(emit->as, reg_dest, si->data.u_imm);
} else if (si->vtype == VTYPE_BOOL) {
emit_native_mov_reg_const(emit, reg_dest, MP_F_CONST_FALSE_OBJ + si->data.u_imm);
} else if (si->vtype == VTYPE_INT || si->vtype == VTYPE_UINT) {
ASM_MOV_REG_IMM(emit->as, reg_dest, (uintptr_t)MP_OBJ_NEW_SMALL_INT(si->data.u_imm));
} else if (si->vtype == VTYPE_PTR_NONE) {
emit_native_mov_reg_const(emit, reg_dest, MP_F_CONST_NONE_OBJ);
} else {
mp_raise_NotImplementedError(MP_ERROR_TEXT("conversion to object"));
}
return VTYPE_PYOBJ;
}
}
// Copies all unsettled registers and immediates that are Python values into the
// concrete Python stack. This ensures the concrete Python stack holds valid
// values for the current stack_size.
// This function may clobber REG_TEMP1.
STATIC void need_stack_settled(emit_t *emit) {
DEBUG_printf(" need_stack_settled; stack_size=%d\n", emit->stack_size);
need_reg_all(emit);
for (int i = 0; i < emit->stack_size; i++) {
stack_info_t *si = &emit->stack_info[i];
if (si->kind == STACK_IMM) {
DEBUG_printf(" imm(" INT_FMT ") to local(%u)\n", si->data.u_imm, emit->stack_start + i);
si->kind = STACK_VALUE;
// using REG_TEMP1 to avoid clobbering REG_TEMP0 (aka REG_RET)
si->vtype = load_reg_stack_imm(emit, REG_TEMP1, si, false);
emit_native_mov_state_reg(emit, emit->stack_start + i, REG_TEMP1);
}
}
}
// pos=1 is TOS, pos=2 is next, etc
STATIC void emit_access_stack(emit_t *emit, int pos, vtype_kind_t *vtype, int reg_dest) {
need_reg_single(emit, reg_dest, pos);
stack_info_t *si = &emit->stack_info[emit->stack_size - pos];
*vtype = si->vtype;
switch (si->kind) {
case STACK_VALUE:
emit_native_mov_reg_state(emit, reg_dest, emit->stack_start + emit->stack_size - pos);
break;
case STACK_REG:
if (si->data.u_reg != reg_dest) {
ASM_MOV_REG_REG(emit->as, reg_dest, si->data.u_reg);
}
break;
case STACK_IMM:
*vtype = load_reg_stack_imm(emit, reg_dest, si, false);
break;
}
}
// does an efficient X=pop(); discard(); push(X)
// needs a (non-temp) register in case the poped element was stored in the stack
STATIC void emit_fold_stack_top(emit_t *emit, int reg_dest) {
stack_info_t *si = &emit->stack_info[emit->stack_size - 2];
si[0] = si[1];
if (si->kind == STACK_VALUE) {
// if folded element was on the stack we need to put it in a register
emit_native_mov_reg_state(emit, reg_dest, emit->stack_start + emit->stack_size - 1);
si->kind = STACK_REG;
si->data.u_reg = reg_dest;
}
adjust_stack(emit, -1);
}
// If stacked value is in a register and the register is not r1 or r2, then
// *reg_dest is set to that register. Otherwise the value is put in *reg_dest.
STATIC void emit_pre_pop_reg_flexible(emit_t *emit, vtype_kind_t *vtype, int *reg_dest, int not_r1, int not_r2) {
emit->last_emit_was_return_value = false;
stack_info_t *si = peek_stack(emit, 0);
if (si->kind == STACK_REG && si->data.u_reg != not_r1 && si->data.u_reg != not_r2) {
*vtype = si->vtype;
*reg_dest = si->data.u_reg;
need_reg_single(emit, *reg_dest, 1);
} else {
emit_access_stack(emit, 1, vtype, *reg_dest);
}
adjust_stack(emit, -1);
}
STATIC void emit_pre_pop_discard(emit_t *emit) {
emit->last_emit_was_return_value = false;
adjust_stack(emit, -1);
}
STATIC void emit_pre_pop_reg(emit_t *emit, vtype_kind_t *vtype, int reg_dest) {
emit->last_emit_was_return_value = false;
emit_access_stack(emit, 1, vtype, reg_dest);
adjust_stack(emit, -1);
}
STATIC void emit_pre_pop_reg_reg(emit_t *emit, vtype_kind_t *vtypea, int rega, vtype_kind_t *vtypeb, int regb) {
emit_pre_pop_reg(emit, vtypea, rega);
emit_pre_pop_reg(emit, vtypeb, regb);
}
STATIC void emit_pre_pop_reg_reg_reg(emit_t *emit, vtype_kind_t *vtypea, int rega, vtype_kind_t *vtypeb, int regb, vtype_kind_t *vtypec, int regc) {
emit_pre_pop_reg(emit, vtypea, rega);
emit_pre_pop_reg(emit, vtypeb, regb);
emit_pre_pop_reg(emit, vtypec, regc);
}
STATIC void emit_post(emit_t *emit) {
(void)emit;
}