--- /dev/null
+#pragma once
+
+#include "vg_platform.h"
+#include "vg_log.h"
+#include "vg_mem.h"
+
+#include <stdlib.h>
+#include <malloc.h>
+
+struct vg_global_mem vg_mem;
+
+u32 vg_align8( u32 s )
+{
+ u32 m = (s + 7) >> 3;
+ return m << 3;
+}
+
+u32 vg_align4( u32 s )
+{
+ u32 m = (s + 3) >> 2;
+ return m << 2;
+}
+
+/* Returns allocator structure from data pointer */
+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))
+void *_vg_linear_alloc( void *buffer, u32 size, const char *constr_name )
+{
+ if( size % 8 ){
+ vg_error( "alloc(%u) is not 8 byte aligned\n", size );
+ vg_print_backtrace();
+ size = vg_align8( size );
+ }
+ if( ((u64)buffer) % 8 ){
+ vg_fatal_error( "unaligned buffer (%p)", buffer );
+ }
+
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ if( (alloc->cur + size) > alloc->size ){
+ vg_fatal_error( "linear allocator overflow (%u + %u > %u)\n",
+ alloc->cur, size, alloc->size );
+ }
+
+ if( alloc->flags & VG_MEMORY_SYSTEM )
+ if( (alloc->allocation_count + 1) > VG_MAX_ALLOCATIONS )
+ vg_fatal_error( "Max linear allocations reached" );
+
+ void *data;
+
+ if( vg_mem.use_libc_malloc && (alloc->flags & VG_MEMORY_SYSTEM) ){
+ data = malloc( size );
+
+ vg_allocation_meta *meta = &alloc->alloc_table[ alloc->allocation_count ];
+ meta->type = k_allocation_type_block;
+ meta->data = data;
+ meta->size = size;
+ meta->name = constr_name;
+ }
+ else{
+ data = buffer + alloc->cur;
+ }
+
+ u8 *bytes = data;
+ for( u32 i=0; i<size; i++ ){
+ bytes[i] = 0xfe;
+ }
+
+ alloc->allocation_count ++;
+ alloc->last_alloc = data;
+ alloc->last_alloc_size = size;
+ alloc->cur += size;
+
+ if( ((u64)data) % 8 ){
+ vg_fatal_error( "unaligned" );
+ }
+
+ return data;
+}
+
+/* resize latest block of memory from linear */
+__attribute__((warn_unused_result))
+void *vg_linear_resize( void *buffer, void *data, u32 newsize )
+{
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ if( newsize % 8 ){
+ vg_error( "alloc(%u) is not 8 byte aligned\n", newsize );
+ vg_print_backtrace();
+ newsize = vg_align8( newsize );
+ }
+
+ if( alloc->last_alloc != data )
+ vg_fatal_error( "This block has been fixed!" );
+
+ if( (alloc->cur - alloc->last_alloc_size + newsize) > alloc->size )
+ vg_fatal_error( "Cannot resize, overflow" );
+
+ 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) ){
+ data = realloc( data, newsize );
+ if( !data )
+ vg_fatal_error( "realloc failed" );
+
+ alloc->alloc_table[ alloc->allocation_count-1 ].data = data;
+ alloc->last_alloc = data;
+ return data;
+ }
+ else{
+ return data;
+ }
+}
+
+/* its possible to delete just the last item */
+void vg_linear_del( void *buffer, void *data )
+{
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ if( alloc->last_alloc != data ){
+ vg_fatal_error( "This block has been fixed! Last alloc: %p, this: %p\n",
+ alloc->last_alloc, data );
+ }
+
+ 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_error( "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))
+void *_vg_linear_extend( void *buffer, void *data, u32 extra,
+ const char *constr_name )
+{
+ if( !data )
+ return _vg_linear_alloc( buffer, vg_align8(extra), constr_name );
+
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+
+ if( alloc->last_alloc != data )
+ vg_fatal_error( "This block has been fixed!" );
+
+ u32 new_size = alloc->last_alloc_size + extra;
+ return vg_linear_resize( buffer, data, vg_align8(new_size) );
+}
+
+/* get the current usage of allocator */
+u32 vg_linear_get_cur( void *buffer )
+{
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+ return alloc->cur;
+}
+
+/* get the capacity of allocator. */
+u32 vg_linear_get_capacity( void *buffer )
+{
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+ return alloc->size;
+}
+
+/* get the remaining size of the allocator */
+u32 vg_linear_remaining( void *buffer )
+{
+ vg_linear_allocator *alloc = vg_linear_header( buffer );
+ return alloc->size - alloc->cur;
+}
+
+/* yeet all memory from linear allocator */
+void vg_linear_clear( void *buffer )
+{
+ 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 );
+ }
+ }
+ }
+
+ alloc->last_alloc = NULL;
+ alloc->last_alloc_size = 0;
+ alloc->allocation_count = 0;
+ alloc->cur = 0;
+}
+
+/* allocate a FIXED SIZE linear allocator
+ *
+ * FIXME: there was a bug in vg's code that caused a race condition between
+ * two system allocations. make this IMPOSSIBLE by requiring a lock
+ * on the allocater to be passed between threads.
+ *
+ * luckily that bug only exists when using development tools, but still!
+ *
+ * this should then only be checked and turned on in debugging.
+ *
+ */
+void *_vg_create_linear_allocator( void *lin_alloc, u32 size,
+ u16 flags, const char *constr_name)
+{
+ if( sizeof( vg_linear_allocator ) != 32 )
+ vg_fatal_error( "Programming error" );
+
+ vg_linear_allocator *header;
+ u32 block_size = size + sizeof(vg_linear_allocator);
+
+ /* Creating it inside an existing one */
+ if( lin_alloc ){
+ vg_linear_allocator *alloc = vg_linear_header( lin_alloc );
+
+ if( alloc->cur + block_size > alloc->size )
+ vg_fatal_error( "Out of memory" );
+
+ if( alloc->allocation_count + 1 > VG_MAX_ALLOCATIONS )
+ vg_fatal_error( "Max allocations in linear allocator" );
+
+ if( (flags && VG_MEMORY_SYSTEM) && (alloc->flags & VG_MEMORY_REALTIME) )
+ vg_fatal_error( "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;
+ meta->size = size;
+ meta->name = constr_name;
+ }
+ else{
+ header = lin_alloc + alloc->cur;
+ }
+
+ alloc->cur += block_size;
+ alloc->last_alloc = header;
+ alloc->last_alloc_size = block_size;
+ alloc->allocation_count ++;
+ }
+ else{
+ if( vg_mem.use_libc_malloc && (flags & VG_MEMORY_SYSTEM) )
+ header = malloc( sizeof(vg_linear_allocator) );
+ else
+ header = malloc( block_size );
+ }
+
+ header->allocation_count = 0;
+ header->cur = 0;
+ header->last_alloc = NULL;
+ header->last_alloc_size = 0;
+ header->size = size;
+ header->flags = flags;
+
+ 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 );
+ }
+ else
+ header->alloc_table = NULL;
+
+ return header+1;
+}
+
+/* request all the memory we need in advance */
+void vg_set_mem_quota( u32 size )
+{
+ vg_mem.quota = size;
+}
+
+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 Root" );
+ vg_mem.scratch = _vg_create_linear_allocator( vg_mem.rtmemory,
+ size_scratch,
+ VG_MEMORY_SYSTEM,
+ "Scratch buffer" );
+}
+
+void vg_mem_log( void *lin_alloc, int depth, const char *name )
+{
+ if( vg_mem.use_libc_malloc ){
+ vg_linear_allocator *alloc = vg_linear_header( lin_alloc );
+
+ u32 s = alloc->size;
+ f32 p = ((float)alloc->cur / (float)alloc->size) * 100.0f;
+
+ for( int i=0; i<depth; i++ ) printf( " " );
+ printf( "LA(%s): %u bytes, %f%% used\n", name, s, p );
+
+ if( 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 ){
+ for( int i=0; i<depth+1; i++ ) printf( " " );
+ printf( "B(%s): %u bytes\n", meta->name, meta->size );
+ }
+ else{
+ vg_mem_log( meta->data, depth +1, meta->name );
+ }
+ }
+ }
+ else{
+ for( int i=0; i<depth+1; i++ ) printf( " " );
+ printf( "<opaque memory> (UNTRACKED)\n" );
+ }
+ }
+ else{
+ vg_error( "allocations are not tracked (turn on libc mode)\n" );
+ }
+}
projects / vg.git / blobdiff