4coder/4coder_mem.h

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#ifndef FCODER_MEM_H
#define FCODER_MEM_H
struct Partition{
char *base;
int pos, max;
};
struct Temp_Memory{
void *handle;
int pos;
};
inline Partition
make_part(void *memory, int size){
Partition partition;
partition.base = (char*)memory;
partition.pos = 0;
partition.max = size;
return partition;
}
inline void*
partition_allocate(Partition *data, int size){
void *ret = 0;
if (size > 0 && data->pos + size <= data->max){
ret = data->base + data->pos;
data->pos += size;
}
return ret;
}
inline void
partition_align(Partition *data, unsigned int boundary){
--boundary;
data->pos = (data->pos + boundary) & (~boundary);
}
inline void*
partition_current(Partition *data){
return data->base + data->pos;
}
inline int
partition_remaining(Partition *data){
return data->max - data->pos;
}
inline Partition
partition_sub_part(Partition *data, int size){
Partition result = {};
void *d = partition_allocate(data, size);
if (d) result = make_part(d, size);
return result;
}
#define push_struct(part, T) (T*)partition_allocate(part, sizeof(T))
#define push_array(part, T, size) (T*)partition_allocate(part, sizeof(T)*(size))
#define push_block(part, size) partition_allocate(part, size)
inline Temp_Memory
begin_temp_memory(Partition *data){
Temp_Memory result;
result.handle = data;
result.pos = data->pos;
return result;
}
inline void
end_temp_memory(Temp_Memory temp){
((Partition*)temp.handle)->pos = temp.pos;
}
#endif