116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/*
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* Copyright (c) 2001 Stephen Williams (steve@icarus.com)
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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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#ifdef HAVE_CVS_IDENT
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#ident "$Id: codes.cc,v 1.14 2003/08/01 00:58:03 steve Exp $"
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#endif
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# include "codes.h"
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# include "statistics.h"
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# include <string.h>
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# include <assert.h>
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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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/*
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* $Log: codes.cc,v $
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* Revision 1.14 2003/08/01 00:58:03 steve
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* Initialize allocated memory.
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*
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* Revision 1.13 2003/07/03 20:03:36 steve
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* Remove the vvp_cpoint_t indirect code pointer.
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*
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* Revision 1.12 2002/08/12 01:35:07 steve
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* conditional ident string using autoconfig.
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*
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* Revision 1.11 2002/07/05 03:46:43 steve
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* Track opcode memory space.
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*
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* Revision 1.10 2002/07/05 02:50:58 steve
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* Remove the vpi object symbol table after compile.
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*/
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