114 lines
4.0 KiB
C
114 lines
4.0 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <assert.h>
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#include <string.h>
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#include "py/obj.h"
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#include "py/misc.h"
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#include "py/asmbase.h"
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#if MICROPY_EMIT_MACHINE_CODE
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void mp_asm_base_init(mp_asm_base_t *as, size_t max_num_labels) {
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as->max_num_labels = max_num_labels;
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as->label_offsets = m_new(size_t, max_num_labels);
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}
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void mp_asm_base_deinit(mp_asm_base_t *as, bool free_code) {
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if (free_code) {
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MP_PLAT_FREE_EXEC(as->code_base, as->code_size);
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}
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m_del(size_t, as->label_offsets, as->max_num_labels);
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}
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void mp_asm_base_start_pass(mp_asm_base_t *as, int pass) {
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if (pass < MP_ASM_PASS_EMIT) {
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// Reset labels so we can detect backwards jumps (and verify unique assignment)
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memset(as->label_offsets, -1, as->max_num_labels * sizeof(size_t));
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} else {
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// allocating executable RAM is platform specific
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MP_PLAT_ALLOC_EXEC(as->code_offset, (void **)&as->code_base, &as->code_size);
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assert(as->code_base != NULL);
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}
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as->pass = pass;
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as->suppress = false;
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as->code_offset = 0;
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}
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// all functions must go through this one to emit bytes
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// if as->pass < MP_ASM_PASS_EMIT, then this function just counts the number
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// of bytes needed and returns NULL, and callers should not store any data
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// It also returns NULL if generated code should be suppressed at this point.
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uint8_t *mp_asm_base_get_cur_to_write_bytes(void *as_in, size_t num_bytes_to_write) {
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mp_asm_base_t *as = as_in;
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uint8_t *c = NULL;
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if (as->suppress) {
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return c;
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}
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if (as->pass == MP_ASM_PASS_EMIT) {
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assert(as->code_offset + num_bytes_to_write <= as->code_size);
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c = as->code_base + as->code_offset;
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}
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as->code_offset += num_bytes_to_write;
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return c;
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}
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void mp_asm_base_label_assign(mp_asm_base_t *as, size_t label) {
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assert(label < as->max_num_labels);
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// Assiging a label ends any dead-code region, and all following machine
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// code should be emitted (until another mp_asm_base_suppress_code() call).
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as->suppress = false;
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if (as->pass < MP_ASM_PASS_EMIT) {
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// assign label offset
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assert(as->label_offsets[label] == (size_t)-1);
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as->label_offsets[label] = as->code_offset;
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} else {
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// ensure label offset has not changed from PASS_COMPUTE to PASS_EMIT
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assert(as->label_offsets[label] == as->code_offset);
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}
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}
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// align must be a multiple of 2
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void mp_asm_base_align(mp_asm_base_t *as, unsigned int align) {
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as->code_offset = (as->code_offset + align - 1) & (~(align - 1));
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}
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// this function assumes a little endian machine
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void mp_asm_base_data(mp_asm_base_t *as, unsigned int bytesize, uintptr_t val) {
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uint8_t *c = mp_asm_base_get_cur_to_write_bytes(as, bytesize);
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if (c != NULL) {
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for (unsigned int i = 0; i < bytesize; i++) {
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*c++ = val;
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val >>= 8;
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}
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}
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}
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#endif // MICROPY_EMIT_MACHINE_CODE
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