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Large Pack of OldSkool DOS MOD Trackers
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goattracker_2.68.zip
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expr.c
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C/C++ Source or Header
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2008-04-01
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/*
* Copyright (c) 2005 Magnus Lind.
*
* This software is provided 'as-is', without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software, alter it and re-
* distribute it freely for any non-commercial, non-profit purpose subject to
* the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software in a
* product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any distribution.
*
* 4. The names of this software and/or it's copyright holders may not be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
*/
#include "expr.h"
#include "chnkpool.h"
#include "log.h"
#include <stdlib.h>
static struct chunkpool s_expr_pool[1];
void expr_init()
{
chunkpool_init(s_expr_pool, sizeof(struct expr));
}
void expr_free()
{
chunkpool_free(s_expr_pool);
}
void expr_dump(int level, struct expr *e)
{
switch(e->expr_op)
{
case SYMBOL:
LOG(level, ("expr 0x%08X symref %s\n", (u32)e, e->type.symref));
break;
case NUMBER:
LOG(level, ("expr 0x%08X number %d\n", (u32)e, e->type.number));
break;
case vNEG:
LOG(level, ("expr 0x%08X unary op %d, referring to 0x%08X\n",
(u32)e, e->expr_op, (u32)e->type.arg1));
case LNOT:
LOG(level, ("expr 0x%08X unary op %d, referring to 0x%08X\n",
(u32)e, e->expr_op, (u32)e->type.arg1));
break;
default:
LOG(level, ("expr 0x%08X binary op %d, arg1 0x%08X, arg2 0x%08X\n",
(u32)e, e->expr_op, (u32)e->type.arg1, (u32)e->expr_arg2));
}
}
struct expr *new_expr_op1(i16 op, struct expr *arg)
{
struct expr *val;
if(op != vNEG && op != LNOT)
{
/* error, invalid unary operator */
LOG(LOG_ERROR, ("%d not allowed as unary operator\n", op));
exit(1);
}
val = chunkpool_malloc(s_expr_pool);
val->expr_op = op;
val->type.arg1 = arg;
expr_dump(LOG_DEBUG, val);
return val;
}
struct expr *new_expr_op2(i16 op, struct expr *arg1, struct expr *arg2)
{
struct expr *val;
if(op == vNEG ||
op == LNOT ||
op == NUMBER ||
op == SYMBOL)
{
/* error, invalid binary operator */
printf("op %d, vNEG %d, NUMBER %d, SYMBOL %d\n", op, vNEG, NUMBER, SYMBOL);
LOG(LOG_ERROR, ("%d not allowed as binary operator\n", op));
exit(1);
}
val = chunkpool_malloc(s_expr_pool);
val->expr_op = op;
val->type.arg1 = arg1;
val->expr_arg2 = arg2;
expr_dump(LOG_DEBUG, val);
return val;
}
struct expr *new_expr_symref(const char *symbol)
{
struct expr *val;
val = chunkpool_malloc(s_expr_pool);
val->expr_op = SYMBOL;
val->type.symref = symbol;
expr_dump(LOG_DEBUG, val);
return val;
}
struct expr *new_expr_number(i32 number)
{
struct expr *val;
LOG(LOG_DEBUG, ("creating new number %d\n", number));
val = chunkpool_malloc(s_expr_pool);
val->expr_op = NUMBER;
val->type.number = number;
expr_dump(LOG_DEBUG, val);
return val;
}