#ifndef VG_MEM_H
#define VG_MEM_H
+#include "vg.h"
#include "vg_stdint.h"
#include "vg_platform.h"
#include <stdlib.h>
#include <malloc.h>
+#define VG_MAX_ALLOCATIONS 64
+#define VG_FUZZ_ALLOCATIONS
+
typedef struct vg_linear_allocator vg_linear_allocator;
+typedef struct vg_allocation_meta vg_allocation_meta;
struct
{
void *rtmemory,
*scratch;
+
+ int use_libc_malloc;
+ u32 quota;
}
static vg_mem;
-struct vg_linear_allocator
+struct vg_allocation_meta
{
- u32 size, cur;
-
- /* allows temporarily extendable buffers */
- void *last_alloc;
- u32 last_alloc_size;
+ void *data;
+ enum allocation_type
+ {
+ k_allocation_type_block = 0,
+ k_allocation_type_linear = 1
+ }
+ type;
};
+#define VG_MEMORY_SYSTEM 0x1 /* systems memory, slow and low counts */
+#define VG_MEMORY_REALTIME 0x2 /* per-frame. no max allocs, only size. fast */
+
+/* systems memory cannot be declared inside realtime memory regions */
+
/*
- * TODO: Fallback on libc
+ * Stored just behind the array. 32 bytes.
*/
+#pragma pack(push,1)
+struct vg_linear_allocator
+{
+ u32 size;
+ /* */
+ /* */
+ /* */
+ u32 cur;
+ /* */
+ /* */
+ /* */
+ u16 allocation_count;
+ /* */
+ u16 flags;
+ /* */
+ u32 last_alloc_size;
+ /* */
+ /* */
+ /* */
+ void *last_alloc;
+ /* */
+ /* */
+ /* */
+ /* */
+ /* */
+ /* */
+ /* */
+ vg_allocation_meta *alloc_table;
+ /* */
+ /* */
+ /* */
+ /* */
+ /* */
+ /* */
+ /* */
+
+#ifdef _WIN32
+ /* 32 bit pointers! */
+ u8 padding[ 8 ];
+#endif
+};
+#pragma pack(pop)
+VG_STATIC void vg_fatal_exit_loop( const char *error );
VG_STATIC void vg_error(const char *fmt, ...);
+VG_STATIC void vg_info(const char *fmt, ...);
+
+/* Returns allocator structure from data pointer */
+static vg_linear_allocator *vg_linear_header( void *data )
+{
+ vg_linear_allocator *ptr = data;
+ ptr --;
+
+ return ptr;
+}
/* allocate something from a linear allocator */
__attribute__((warn_unused_result))
-VG_STATIC void *vg_linear_alloc( void *allocator, u32 size )
+VG_STATIC void *vg_linear_alloc( void *buffer, u32 size )
{
- size += 7;
- size >>= 3;
- size <<= 3;
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ if( (alloc->cur + size) > alloc->size )
+ {
+ vg_error( "%u + %u > %u\n", alloc->cur, size, alloc->size );
+ vg_fatal_exit_loop( "linear allocator overflow" );
+ }
- if( allocator == NULL )
- vg_fatal_exit_loop( "Null allocator" );
+ if( alloc->flags & VG_MEMORY_SYSTEM )
+ if( (alloc->allocation_count + 1) > VG_MAX_ALLOCATIONS )
+ vg_fatal_exit_loop( "Max linear allocations reached" );
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
+ void *data;
- if( allocptr->cur + size > allocptr->size )
+ if( vg_mem.use_libc_malloc && (alloc->flags & VG_MEMORY_SYSTEM) )
{
- vg_error( "%u(current) + %u(alloc) > %u(max)\n",
- allocptr->cur, size, allocptr->size );
+ data = malloc( size );
- vg_fatal_exit_loop( "Linear allocator out of memory" );
+ vg_allocation_meta *meta = &alloc->alloc_table[ alloc->allocation_count ];
+ meta->type = k_allocation_type_block;
+ meta->data = data;
+ }
+ else
+ {
+ data = buffer + alloc->cur;
}
- void *data = allocator + allocptr->cur;
- allocptr->cur += size;
- allocptr->last_alloc = data;
- allocptr->last_alloc_size = size;
+ alloc->allocation_count ++;
+ alloc->last_alloc = data;
+ alloc->last_alloc_size = size;
+ alloc->cur += size;
return data;
}
+
/* resize latest block of memory from linear */
__attribute__((warn_unused_result))
-VG_STATIC void *vg_linear_resize( void *allocator, void *data, u32 newsize )
+VG_STATIC void *vg_linear_resize( void *buffer, void *data, u32 newsize )
{
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ if( alloc->last_alloc != data )
+ vg_fatal_exit_loop( "This block has been fixed!" );
+
+ if( (alloc->cur - alloc->last_alloc_size + newsize) > alloc->size )
+ vg_fatal_exit_loop( "Cannot resize, overflow" );
- if( allocptr->last_alloc == data )
+ alloc->cur -= alloc->last_alloc_size;
+ alloc->cur += newsize;
+ alloc->last_alloc_size = newsize;
+
+ if( vg_mem.use_libc_malloc && (alloc->flags & VG_MEMORY_SYSTEM) )
{
- allocptr->cur -= allocptr->last_alloc_size;
- return vg_linear_alloc( allocator, newsize );
+ data = realloc( data, newsize );
+ if( !data )
+ vg_fatal_exit_loop( "realloc failed" );
+
+ alloc->alloc_table[ alloc->allocation_count-1 ].data = data;
+ alloc->last_alloc = data;
+ return data;
}
else
{
- vg_fatal_exit_loop( "Cannot resize this buffer anymore" );
+ return data;
}
-
- return NULL;
}
-VG_STATIC void vg_linear_del( void *allocator, void *data )
+/* its possible to delete just the last item */
+VG_STATIC void vg_linear_del( void *buffer, void *data )
{
- void *ignore = vg_linear_resize( allocator, data, 0 );
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
+ if( alloc->last_alloc != data )
+ vg_fatal_exit_loop( "This block has been fixed!" );
- allocptr->last_alloc = NULL;
- allocptr->last_alloc_size = 0;
+ if( vg_mem.use_libc_malloc && (alloc->flags & VG_MEMORY_SYSTEM) )
+ {
+ vg_allocation_meta *meta = &alloc->alloc_table[alloc->allocation_count-1];
+ if( meta->type == k_allocation_type_linear )
+ vg_fatal_exit_loop( "Cannot free a linear allocator in this conext" );
+
+ free( data );
+ }
+
+ alloc->allocation_count --;
+ alloc->cur -= alloc->last_alloc_size;
+ alloc->last_alloc = NULL;
+ alloc->last_alloc_size = 0;
}
/* extend latest block of memory from linear */
__attribute__((warn_unused_result))
-VG_STATIC void *vg_linear_extend( void *allocator, void *data, u32 extra )
+VG_STATIC void *vg_linear_extend( void *buffer, void *data, u32 extra )
{
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ if( alloc->last_alloc != data )
+ vg_fatal_exit_loop( "This block has been fixed!" );
- return vg_linear_resize( allocator, data, allocptr->last_alloc_size+extra );
+ u32 new_size = alloc->last_alloc_size + extra;
+ return vg_linear_resize( buffer, data, new_size );
}
/* get the current usage of allocator */
-VG_STATIC u32 vg_linear_get_cur( void *allocator )
+VG_STATIC u32 vg_linear_get_cur( void *buffer )
{
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
-
- return allocptr->cur;
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+ return alloc->cur;
}
-/* get the capacity of allocator */
-VG_STATIC u32 vg_linear_get_capacity( void *allocator )
+/* get the capacity of allocator. */
+VG_STATIC u32 vg_linear_get_capacity( void *buffer )
{
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
-
- return allocptr->size;
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+ return alloc->size;
}
-/* get the size of the last allocated thing */
-VG_STATIC u32 vg_linear_last_size( void *allocator )
+/* get the remaining size of the allocator */
+VG_STATIC u32 vg_linear_remaining( void *buffer )
{
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
-
- return allocptr->last_alloc_size;
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+ return alloc->size - alloc->cur;
}
/* yeet all memory from linear allocator */
-VG_STATIC void vg_linear_clear( void *allocator )
+VG_STATIC void vg_linear_clear( void *buffer )
{
- vg_linear_allocator *allocptr = allocator;
- allocptr --;
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ /* libc mode we recursively free any allocations made */
+ if( vg_mem.use_libc_malloc && (alloc->flags & VG_MEMORY_SYSTEM) )
+ {
+ for( u32 i=0; i<alloc->allocation_count; i++ )
+ {
+ vg_allocation_meta *meta = &alloc->alloc_table[i];
+
+ if( meta->type == k_allocation_type_block )
+ {
+ free( meta->data );
+ }
+ else
+ {
+ vg_linear_clear( meta->data );
+ vg_linear_allocator *sub = vg_linear_header( meta->data );
+
+ free( sub->alloc_table );
+ free( sub );
+ }
+ }
+ }
- allocptr->last_alloc = NULL;
- allocptr->last_alloc_size = 0;
- allocptr->cur = 0;
+ alloc->last_alloc = NULL;
+ alloc->last_alloc_size = 0;
+ alloc->allocation_count = 0;
+ alloc->cur = 0;
}
/* allocate a FIXED SIZE linear allocator */
-VG_STATIC void *vg_create_linear_allocator( void *lin_alloc, u32 size )
+VG_STATIC void *vg_create_linear_allocator( void *lin_alloc, u32 size,
+ u16 flags )
{
- u32 total = size + sizeof(vg_linear_allocator);
- vg_linear_allocator *allocptr;
+ assert( sizeof( vg_linear_allocator ) == 32 );
- if( lin_alloc == NULL )
+ vg_linear_allocator *header;
+ u32 block_size = size + sizeof(vg_linear_allocator);
+
+ /* Creating it inside an existing one */
+ if( lin_alloc )
{
- static int allow_once = 1;
+ vg_linear_allocator *alloc = vg_linear_header( lin_alloc );
- if( allow_once )
- {
- allocptr = malloc( total );
+ if( alloc->cur + block_size > alloc->size )
+ vg_fatal_exit_loop( "Out of memory" );
- if( allocptr == NULL )
- vg_fatal_exit_loop( "Create linear: Malloc failed" );
+ if( alloc->allocation_count + 1 > VG_MAX_ALLOCATIONS )
+ vg_fatal_exit_loop( "Max allocations in linear allocator" );
- allow_once = 0;
+ if( (flags && VG_MEMORY_SYSTEM) && (alloc->flags & VG_MEMORY_REALTIME) )
+ vg_fatal_exit_loop( "Cannot declare realtime allocator inside systems"
+ " allocator" );
+
+ if( vg_mem.use_libc_malloc )
+ {
+ vg_allocation_meta *meta =
+ &alloc->alloc_table[ alloc->allocation_count ];
+
+ if( flags & VG_MEMORY_REALTIME )
+ header = malloc( block_size );
+ else
+ header = malloc( sizeof(vg_linear_allocator) );
+
+ meta->data = header+1;
+ meta->type = k_allocation_type_linear;
}
else
- vg_fatal_exit_loop( "Shouldnt call this twice!" );
+ {
+ header = lin_alloc + alloc->cur;
+ }
+
+ alloc->cur += block_size;
+ alloc->last_alloc = NULL; /* cant resize this block! */
+ alloc->last_alloc_size = block_size;
+
+ alloc->allocation_count ++;
}
else
{
- vg_linear_allocator *parent = lin_alloc;
- parent --;
+ if( vg_mem.use_libc_malloc && (flags & VG_MEMORY_SYSTEM) )
+ header = malloc( sizeof(vg_linear_allocator) );
+ else
+ header = malloc( block_size );
+ }
- allocptr = vg_linear_alloc( lin_alloc, total );
+ header->allocation_count = 0;
+ header->cur = 0;
+ header->last_alloc = NULL;
+ header->last_alloc_size = 0;
+ header->size = size;
+ header->flags = flags;
-#if 0
- parent->last_alloc = allocptr+1;
- parent->last_alloc_size = total;
-#else
- parent->last_alloc = NULL;
- parent->last_alloc_size = total;
-#endif
+ if( vg_mem.use_libc_malloc && (flags & VG_MEMORY_SYSTEM) )
+ {
+ u32 table_size = sizeof(vg_allocation_meta)*VG_MAX_ALLOCATIONS;
+ header->alloc_table = malloc( table_size );
}
-
- allocptr->size = size;
- allocptr->cur = 0;
- allocptr->last_alloc = NULL;
- allocptr->last_alloc_size = 0;
-
- void *data = allocptr+1;
- return data;
+ else
+ header->alloc_table = NULL;
+
+ return header+1;
}
/* request all the memory we need in advance */
-VG_STATIC void vg_prealloc_quota( u32 size )
+VG_STATIC void vg_set_mem_quota( u32 size )
{
- size = VG_MAX( size, 20*1024*1024 );
- vg_mem.rtmemory = vg_create_linear_allocator( NULL, size );
- vg_mem.scratch = vg_create_linear_allocator( vg_mem.rtmemory, 10*1024*1024 );
+ vg_mem.quota = size;
+}
+
+VG_STATIC void vg_alloc_quota(void)
+{
+ u32 size_scratch = 10*1024*1024;
+ u32 size = VG_MAX( vg_mem.quota, size_scratch );
+
+ vg_mem.rtmemory = vg_create_linear_allocator( NULL, size, VG_MEMORY_SYSTEM );
+ vg_mem.scratch = vg_create_linear_allocator( vg_mem.rtmemory,
+ size_scratch,
+ VG_MEMORY_SYSTEM );
}
#endif /* VG_MEM_H */
projects / vg.git / blobdiff