53e111800f
The assembler back-end for most architectures needs to know if a jump is backwards in order to emit optimised machine code, and they do this by checking if the destination label has been set or not. So always reset label offsets to -1 (this reverts partially the previous commit, with some minor optimisation for the if-logic with the pass variable).
103 lines
3.7 KiB
C
103 lines
3.7 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_NATIVE || MICROPY_EMIT_INLINE_ASM
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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->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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uint8_t *mp_asm_base_get_cur_to_write_bytes(mp_asm_base_t *as, size_t num_bytes_to_write) {
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uint8_t *c = NULL;
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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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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_NATIVE || MICROPY_EMIT_INLINE_ASM
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