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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "types.h"
#include "instset.h"
#include "memory.h"
#define MEM_BLOCK_START_FLAG (0x80)
#define ALLOCATED_FLAG (0x40)
#define INSTRUCTION_MASK (0x3f)
static sbool g_isInit;
static sword g_order;
static sword g_size;
static sword g_memBlockCount;
static sword g_allocated;
static sword g_cap;
static sbyte *g_data;
void
sm_init(sword order)
{
assert(!g_isInit);
assert(INSTRUCTION_MASK == SINST_COUNT - 1);
g_isInit = STRUE;
g_order = order;
g_size = 1 << g_order;
g_cap = g_size / 2;
g_data = calloc(g_size, sizeof(sbyte));
assert(g_data);
}
void
sm_quit(void)
{
assert(g_isInit);
free(g_data);
g_isInit = SFALSE;
g_order = 0;
g_size = 0;
g_memBlockCount = 0;
g_allocated = 0;
g_cap = 0;
g_data = NULL;
}
void
sm_load(FILE *file)
{
assert(!g_isInit);
assert(file);
fread(&g_isInit, sizeof(sbool), 1, file);
fread(&g_order, sizeof(sword), 1, file);
fread(&g_size, sizeof(sword), 1, file);
fread(&g_memBlockCount, sizeof(sword), 1, file);
fread(&g_allocated, sizeof(sword), 1, file);
fread(&g_cap, sizeof(sword), 1, file);
g_data = calloc(g_size, sizeof(sbyte));
assert(g_data);
fread(g_data, sizeof(sbyte), g_size, file);
}
void
sm_save(FILE *file)
{
assert(g_isInit);
assert(file);
fwrite(&g_isInit, sizeof(sbool), 1, file);
fwrite(&g_order, sizeof(sword), 1, file);
fwrite(&g_size, sizeof(sword), 1, file);
fwrite(&g_memBlockCount, sizeof(sword), 1, file);
fwrite(&g_allocated, sizeof(sword), 1, file);
fwrite(&g_cap, sizeof(sword), 1, file);
fwrite(g_data, sizeof(sbyte), g_size, file);
}
sbool
sm_isInit(void)
{
return g_isInit;
}
sword
sm_getOrder(void)
{
return g_order;
}
sword
sm_getSize(void)
{
return g_size;
}
sword
sm_getMemBlockCount(void)
{
return g_memBlockCount;
}
sword
sm_getAllocated(void)
{
return g_allocated;
}
sword
sm_getCap(void)
{
return g_cap;
}
sbool
sm_isOverCap(void)
{
assert(g_isInit);
return g_allocated > g_cap;
}
sbool
sm_isValidAt(sword addr)
{
assert(g_isInit);
return addr < g_size;
}
sbool
sm_isMemBlockStartAt(sword addr)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
return !!(g_data[addr] & MEM_BLOCK_START_FLAG);
}
sbool
sm_isAllocatedAt(sword addr)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
return !!(g_data[addr] & ALLOCATED_FLAG);
}
void
sm_setMemBlockStartAt(sword addr)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
assert(!sm_isMemBlockStartAt(addr));
g_data[addr] ^= MEM_BLOCK_START_FLAG;
g_memBlockCount++;
assert(sm_isMemBlockStartAt(addr));
assert(g_memBlockCount);
assert(g_memBlockCount <= g_size);
}
void
sm_unsetMemBlockStartAt(sword addr)
{
assert(g_isInit);
assert(g_memBlockCount);
assert(sm_isValidAt(addr));
assert(sm_isMemBlockStartAt(addr));
g_data[addr] ^= MEM_BLOCK_START_FLAG;
g_memBlockCount--;
assert(!sm_isMemBlockStartAt(addr));
assert(g_memBlockCount <= g_size);
}
void
sm_allocateAt(sword addr)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
assert(!sm_isAllocatedAt(addr));
g_data[addr] ^= ALLOCATED_FLAG;
g_allocated++;
assert(sm_isAllocatedAt(addr));
assert(g_allocated);
assert(g_allocated <= g_size);
}
void
sm_freeAt(sword addr)
{
assert(g_isInit);
assert(g_allocated);
assert(sm_isValidAt(addr));
assert(sm_isAllocatedAt(addr));
g_data[addr] ^= ALLOCATED_FLAG;
g_allocated--;
assert(!sm_isAllocatedAt(addr));
assert(g_allocated <= g_size);
}
sbyte
sm_getInstAt(sword addr)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
return g_data[addr] & INSTRUCTION_MASK;
}
void
sm_setInstAt(sword addr, sbyte inst)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
assert(si_isInst(inst));
g_data[addr] &= (MEM_BLOCK_START_FLAG | ALLOCATED_FLAG);
g_data[addr] |= inst;
}
sbyte
sm_getByteAt(sword addr)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
return g_data[addr];
}
void
sm_setByteAt(sword addr, sbyte byte)
{
assert(g_isInit);
assert(sm_isValidAt(addr));
g_data[addr] = byte;
}
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