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Rename segment -> seg, index -> addr

This commit is contained in:
Peter Evans 2018-04-15 22:40:44 -05:00
parent b5fef760b8
commit b06c00a547
1 changed files with 64 additions and 64 deletions
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128
src/vm_segment.c
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@ -23,39 +23,39 @@
vm_segment *
vm_segment_create(size_t size)
{
vm_segment *segment;
vm_segment *seg;
// Allocate memory for the current memory segment.
segment = malloc(sizeof(vm_segment));
seg = malloc(sizeof(vm_segment));
// Ack! We couldn't get the memory we wanted. Let's bail.
if (segment == NULL) {
if (seg == NULL) {
log_crit("Couldn't allocate enough space for vm_segment");
return NULL;
}
segment->memory = malloc(sizeof(vm_8bit) * size);
if (segment->memory == NULL) {
free(segment);
seg->memory = malloc(sizeof(vm_8bit) * size);
if (seg->memory == NULL) {
free(seg);
log_crit("Couldn't allocate enough space for vm_segment");
return NULL;
}
// We should zero out memory and make explicit that any new segment
// begins life in that state.
memset(segment->memory, 0, sizeof(vm_8bit) * size);
memset(seg->memory, 0, sizeof(vm_8bit) * size);
segment->read_table = malloc(sizeof(vm_segment_read_fn) * size);
if (segment->read_table == NULL) {
seg->read_table = malloc(sizeof(vm_segment_read_fn) * size);
if (seg->read_table == NULL) {
log_crit("Couldn't allocate enough space for segment read_table");
vm_segment_free(segment);
vm_segment_free(seg);
return NULL;
}
segment->write_table = malloc(sizeof(vm_segment_write_fn) * size);
if (segment->write_table == NULL) {
seg->write_table = malloc(sizeof(vm_segment_write_fn) * size);
if (seg->write_table == NULL) {
log_crit("Couldn't allocate enough space for segment write_table");
vm_segment_free(segment);
vm_segment_free(seg);
return NULL;
}
@ -64,38 +64,38 @@ vm_segment_create(size_t size)
// read/write mapper code to attempt to a run a function with
// garbage. We could have undefined garbage! We can only properly
// work with defined garbage.
memset(segment->read_table, (int)NULL, sizeof(vm_segment_read_fn) * size);
memset(segment->write_table, (int)NULL, sizeof(vm_segment_write_fn) * size);
memset(seg->read_table, (int)NULL, sizeof(vm_segment_read_fn) * size);
memset(seg->write_table, (int)NULL, sizeof(vm_segment_write_fn) * size);
segment->size = size;
seg->size = size;
return segment;
return seg;
}
/*
* Free the memory consumed by a given segment.
*/
void
vm_segment_free(vm_segment *segment)
vm_segment_free(vm_segment *seg)
{
free(segment->memory);
free(segment);
free(seg->memory);
free(seg);
}
/*
* Set the byte in `segment`, at `index`, to the given `value`. Our
* Set the byte in `segment`, at `addr`, to the given `value`. Our
* bounds-checking here will _crash_ the program if we are
* out-of-bounds.
*/
int
vm_segment_set(vm_segment *segment, size_t index, vm_8bit value)
vm_segment_set(vm_segment *seg, size_t addr, vm_8bit value)
{
// Some bounds checking.
if (!vm_segment_bounds_check(segment, index)) {
if (!vm_segment_bounds_check(seg, addr)) {
log_crit(
"Attempt to set segment index (%d) greater than bounds (%d)",
index,
segment->size);
"Attempt to set segment addr (%d) greater than bounds (%d)",
addr,
seg->size);
return ERR_OOB;
}
@ -103,28 +103,28 @@ vm_segment_set(vm_segment *segment, size_t index, vm_8bit value)
void *map_mach = vm_di_get(VM_MACHINE);
// Check if we have a write mapper
if (segment->write_table[index]) {
segment->write_table[index](segment, index, value, map_mach);
if (seg->write_table[addr]) {
seg->write_table[addr](seg, addr, value, map_mach);
return OK;
}
segment->memory[index] = value;
seg->memory[addr] = value;
return OK;
}
/*
* Return the byte in `segment` at the given `index` point. Our
* bounds-checking will _crash_ the program if an index is requested out
* Return the byte in `segment` at the given `addr` point. Our
* bounds-checking will _crash_ the program if an addr is requested out
* of bounds.
*/
vm_8bit
vm_segment_get(vm_segment *segment, size_t index)
vm_segment_get(vm_segment *seg, size_t addr)
{
if (!vm_segment_bounds_check(segment, index)) {
if (!vm_segment_bounds_check(seg, addr)) {
log_crit(
"Attempt to get segment index (%d) greater than bounds (%d)",
index,
segment->size);
"Attempt to get segment addr (%d) greater than bounds (%d)",
addr,
seg->size);
// See vm_segment_set() for a justification of this behavior.
exit(1);
@ -133,11 +133,11 @@ vm_segment_get(vm_segment *segment, size_t index)
void *map_mach = vm_di_get(VM_MACHINE);
// We may have a read mapper for this address
if (segment->read_table[index]) {
return segment->read_table[index](segment, index, map_mach);
if (seg->read_table[addr]) {
return seg->read_table[addr](seg, addr, map_mach);
}
return segment->memory[index];
return seg->memory[addr];
}
/*
@ -147,52 +147,52 @@ vm_segment_get(vm_segment *segment, size_t index)
* contains the least significant byte.
*/
vm_16bit
vm_segment_get16(vm_segment *segment, size_t addr)
vm_segment_get16(vm_segment *seg, size_t addr)
{
vm_16bit msb, lsb;
lsb = (vm_16bit)vm_segment_get(segment, addr);
msb = (vm_16bit)vm_segment_get(segment, addr+1);
lsb = (vm_16bit)vm_segment_get(seg, addr);
msb = (vm_16bit)vm_segment_get(seg, addr+1);
return (msb << 8) | lsb;
}
/*
* Copy a set of bytes from `src` (at `src_index`) to `dest` (at
* `dest_index`), such that the range is `length` bytes long. Note that
* Copy a set of bytes from `src` (at `src_addr`) to `dest` (at
* `dest_addr`), such that the range is `length` bytes long. Note that
* this function presently bypasses our mapper function code... we may
* need to implement such in the future.
*/
int
vm_segment_copy(vm_segment *dest,
vm_segment *src,
size_t dest_index,
size_t src_index,
size_t dest_addr,
size_t src_addr,
size_t length)
{
if (src_index + length > src->size) {
if (src_addr + length > src->size) {
log_crit(
"Attempt to copy beyond bounds of vm_segment (%d + %d >= %d)",
src_index,
src_addr,
length,
src->size);
return ERR_OOB;
}
if (dest_index + length > dest->size) {
if (dest_addr + length > dest->size) {
log_crit(
"Attempt to copy beyond bounds of vm_segment (%d + %d >= %d)",
dest_index,
dest_addr,
length,
dest->size);
return ERR_OOB;
}
memcpy(dest->memory + dest_index,
src->memory + src_index,
length * sizeof(src->memory[src_index]));
memcpy(dest->memory + dest_addr,
src->memory + src_addr,
length * sizeof(src->memory[src_addr]));
return OK;
}
@ -229,15 +229,15 @@ vm_segment_copy_buf(vm_segment *dest, const vm_8bit *src,
* instead of the normal logic on a get for that address.
*/
int
vm_segment_read_map(vm_segment *segment,
vm_segment_read_map(vm_segment *seg,
size_t addr,
vm_segment_read_fn fn)
{
if (addr >= segment->size) {
if (addr >= seg->size) {
return ERR_OOB;
}
segment->read_table[addr] = fn;
seg->read_table[addr] = fn;
return OK;
}
@ -246,15 +246,15 @@ vm_segment_read_map(vm_segment *segment,
* which is to say, when we use the `vm_segment_set()` function.
*/
int
vm_segment_write_map(vm_segment *segment,
vm_segment_write_map(vm_segment *seg,
size_t addr,
vm_segment_write_fn fn)
{
if (addr >= segment->size) {
if (addr >= seg->size) {
return ERR_OOB;
}
segment->write_table[addr] = fn;
seg->write_table[addr] = fn;
return OK;
}
@ -264,9 +264,9 @@ vm_segment_write_map(vm_segment *segment,
* for some reason, signal that and return an error.
*/
int
vm_segment_fread(vm_segment *segment, FILE *stream, size_t offset, size_t len)
vm_segment_fread(vm_segment *seg, FILE *stream, size_t offset, size_t len)
{
fread(segment->memory + offset, sizeof(vm_8bit), len, stream);
fread(seg->memory + offset, sizeof(vm_8bit), len, stream);
// fread() may return zero in the case of an error, but it may
// return a positive non-zero number short of len; we can't quite
@ -305,7 +305,7 @@ vm_segment_fwrite(vm_segment *seg, FILE *stream, size_t off, size_t len)
* therefore consumes bytes at both addr and addr+1.
*/
int
vm_segment_set16(vm_segment *segment, size_t addr, vm_16bit value)
vm_segment_set16(vm_segment *seg, size_t addr, vm_16bit value)
{
vm_8bit lsb, msb;
int err;
@ -315,12 +315,12 @@ vm_segment_set16(vm_segment *segment, size_t addr, vm_16bit value)
// This data needs to be saved in little-endian order; e.g. if we
// get $1234, then we need to store it as $34 $12.
err = vm_segment_set(segment, addr, lsb);
err = vm_segment_set(seg, addr, lsb);
// If the previous set() worked out, then let's try it again with
// the msb.
if (err == OK) {
err = vm_segment_set(segment, addr + 1, msb);
err = vm_segment_set(seg, addr + 1, msb);
}
// If err != OK above, we will just return the err code. If err was