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Cary R
8f6062799e
If there are no opcodes then the various checks access an undefined opcode, so just delete the code space for this case.
130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
/*
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* Copyright (c) 2001-2011 Stephen Williams ([email protected])
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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# include "codes.h"
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# include "statistics.h"
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# include "config.h"
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#ifdef CHECK_WITH_VALGRIND
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# include "vvp_cleanup.h"
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#endif
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# include <cstring>
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# include <cassert>
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/*
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* The code space is broken into chunks, to make for efficient
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* allocation of large amounts. Each chunk is an array of vvp_code_s
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* structures, with the last opcode loaded with an of_CHUNK_LINK
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* instruction to branch to the next chunk. This handles the case
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* where the program counter steps off the end of a chunk.
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*/
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const unsigned code_chunk_size = 1024;
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static struct vvp_code_s *first_chunk = 0;
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static struct vvp_code_s *current_chunk = 0;
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static unsigned current_within_chunk = 0;
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/*
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* This initializes the code space. It sets up the first code chunk,
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* and places at address 0 a ZOMBIE instruction.
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*/
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void codespace_init(void)
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{
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assert(current_chunk == 0);
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first_chunk = new struct vvp_code_s [code_chunk_size];
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current_chunk = first_chunk;
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current_chunk[0].opcode = &of_ZOMBIE;
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current_chunk[code_chunk_size-1].opcode = &of_CHUNK_LINK;
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current_chunk[code_chunk_size-1].cptr = 0;
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current_within_chunk = 1;
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count_opcodes = 0;
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size_opcodes += code_chunk_size * sizeof (struct vvp_code_s);
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}
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vvp_code_t codespace_next(void)
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{
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if (current_within_chunk == (code_chunk_size-1)) {
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current_chunk[code_chunk_size-1].cptr
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= new struct vvp_code_s [code_chunk_size];
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current_chunk = current_chunk[code_chunk_size-1].cptr;
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/* Put a link opcode on the end of the chunk. */
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current_chunk[code_chunk_size-1].opcode = &of_CHUNK_LINK;
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current_chunk[code_chunk_size-1].cptr = 0;
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current_within_chunk = 0;
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size_opcodes += code_chunk_size * sizeof (struct vvp_code_s);
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}
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vvp_code_t res = current_chunk + current_within_chunk;
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return res;
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}
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vvp_code_t codespace_allocate(void)
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{
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vvp_code_t res = codespace_next();
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current_within_chunk += 1;
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count_opcodes += 1;
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memset(res, 0, sizeof(*res));
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return res;
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}
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vvp_code_t codespace_null(void)
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{
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return first_chunk + 0;
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}
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#ifdef CHECK_WITH_VALGRIND
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void codespace_delete(void)
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{
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vvp_code_t cur = first_chunk;
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/* If there are no opcodes then just delete the code space. */
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if (count_opcodes == 0) {
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delete [] cur;
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return;
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}
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do {
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vvp_code_t next = cur[code_chunk_size-1].cptr;
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for (unsigned idx = 0 ; idx < code_chunk_size; idx += 1) {
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count_opcodes -= 1;
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if ((cur+idx)->opcode == &of_VPI_CALL) {
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vpi_call_delete((cur+idx)->handle);
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} else if ((cur+idx)->opcode == &of_EXEC_UFUNC) {
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exec_ufunc_delete((cur+idx));
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} else if ((cur+idx)->opcode == &of_FILE_LINE) {
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delete((cur+idx)->handle);
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}
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if (count_opcodes == 0) break;
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}
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/* Don't count the &of_CHUNK_LINK opcode. */
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if (count_opcodes != 0) count_opcodes += 1;
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delete [] cur;
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cur = next;
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} while (cur != 0);
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}
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#endif
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