www.pudn.com > ucosv2(GUI).rar > GUIAlloc.c
/*
*********************************************************************************************************
* uC/GUI
* Universal graphic software for embedded applications
*
* (c) Copyright 2002, Micrium Inc., Weston, FL
* (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
* µC/GUI is protected by international copyright laws. Knowledge of the
* source code may not be used to write a similar product. This file may
* only be used in accordance with a license and should not be redistributed
* in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File : GUIAlloc.C
Purpose : emWin dynamic memory management
----------------------------------------------------------------------
Version-Date---Author-Explanation
----------------------------------------------------------------------
1.00 000107 RS First version
----------------------------------------------------------------------
Known problems:
None.
----------------------------------------------------------------------
Open issues:
None.
----------------------------------------------------------------------
Todo:
Nothing.
*/
#include /* needed for definition of NULL */
#include /* for memcpy, memset */
#include "GUI_Protected.H"
#include "GUIDebug.h"
#if GUI_ALLOC_SIZE==0
#error GUI_ALLOC_SIZE needs to be > 0 when using this module
#endif
/*
*****************************************************************
*
* Config defaults
*
*****************************************************************
*/
/* Permit automatic defragmentation when necessary */
#ifndef GUI_ALLOC_AUTDEFRAG
#define GUI_ALLOC_AUTDEFRAG 1
#endif
#ifndef GUI_BLOCK_ALIGN
#define GUI_BLOCK_ALIGN 2 /* 2 means 4 bytes, 1 means 2 bytes */
/* 1 can be used on 16-bit CPUs and
CPUs which do not require aligned
32-bit values (such as x86) */
#endif
#ifndef GUI_MAXBLOCKS
#define GUI_MAXBLOCKS (2+GUI_ALLOC_SIZE/32)
#endif
/*
*****************************************************************
*
* Internal types and declarations
*
*****************************************************************
*/
#if GUI_ALLOC_SIZE <32767
#define tALLOCINT I16
#else
#define tALLOCINT I32
#endif
#if GUI_MAXBLOCKS >= 256
#define HANDLE U16
#else
#define HANDLE U8
#endif
typedef struct {
tALLOCINT Off; /* Offset of memory area */
tALLOCINT Size; /* usable size of allocated block */
HANDLE Next; /* next handle in linked list */
HANDLE Prev;
} tBlock;
/****************************************************************
*
* Static data
*
*****************************************************************
*/
GUI_HEAP GUI_Heap; /* Public for debugging only */
static tBlock aBlock[GUI_MAXBLOCKS];
struct {
int NumUsedBlocks, NumFreeBlocks, NumFreeBlocksMin; /* For statistical purposes only */
tALLOCINT NumUsedBytes, NumFreeBytes, NumFreeBytesMin;
} GUI_ALLOC;
static char IsInitialized =0;
/*
********************************************************************
*
* Macros for internal use
*
********************************************************************
*/
#define Min(v0,v1) ((v0>v1) ? v1 : v0)
#define Max(v0,v1) ((v0>v1) ? v0 : v1)
#define ASSIGN_IF_LESS(v0,v1) if (v1=Size)
return i;
}
/* Check last block */
if (GUI_ALLOC_SIZE - (aBlock[i].Off+aBlock[i].Size) >= Size)
return i;
return -1;
}
/*
*************************************************
*
* Create hole in heap area
*
*************************************************
returns: Offset to the memory hole (if available)
-1 if not available
*/
static GUI_HMEM CreateHole(int Size) {
int i, iNext;
int r = -1;
for (i=0; (iNext =aBlock[i].Next) !=0; i= iNext) {
int NumFreeBytes = aBlock[iNext].Off- (aBlock[i].Off+aBlock[i].Size);
if (NumFreeBytes < Size) {
int NumBytesBeforeBlock = aBlock[iNext].Off - (aBlock[i].Off+aBlock[i].Size);
if (NumBytesBeforeBlock) {
U8* pData = &GUI_Heap.abHeap[aBlock[iNext].Off];
memmove(pData-NumBytesBeforeBlock, pData, aBlock[iNext].Size);
aBlock[iNext].Off -=NumBytesBeforeBlock;
}
}
}
/* Check last block */
if (GUI_ALLOC_SIZE - (aBlock[i].Off+aBlock[i].Size) >= Size)
r = i;
return r;
}
static void CheckInit(void) {
if (!IsInitialized)
GUI_ALLOC_Init();
}
/*
********************************************************************
*
* Exported routines
*
********************************************************************
*/
void GUI_ALLOC_Init(void) {
GUI_DEBUG_LOG("\nGUI_ALLOC_Init...");
GUI_ALLOC.NumFreeBlocksMin = GUI_ALLOC.NumFreeBlocks = GUI_MAXBLOCKS-1;
GUI_ALLOC.NumFreeBytesMin = GUI_ALLOC.NumFreeBytes = GUI_ALLOC_SIZE;
GUI_ALLOC.NumUsedBlocks = 0;
GUI_ALLOC.NumUsedBytes = 0;
aBlock[0].Size = (1< GUI_ALLOC.NumFreeBytes) {
GUI_DEBUG_WARN1("GUI_ALLOC_Alloc: Insufficient memory configured (Trying to alloc % bytes)", size);
return 0;
}
/* Locate free handle */
if ((hMemNew = FindFreeHandle()) == 0)
return 0;
/* Locate or Create hole of sufficient size */
hMemIns = FindHole(size);
#if GUI_ALLOC_AUTDEFRAG
if (hMemIns == -1) {
hMemIns = CreateHole(size);
}
#endif
/* Occupy hole */
if (hMemIns==-1) {
GUI_DEBUG_ERROROUT1("GUI_ALLOC_Alloc: Could not allocate %d bytes",size);
return 0;
}
{
int Off = aBlock[hMemIns].Off+aBlock[hMemIns].Size;
int Next = aBlock[hMemIns].Next;
aBlock[hMemNew].Size = size;
aBlock[hMemNew].Off = Off;
if ((aBlock[hMemNew].Next = Next) >0) {
aBlock[Next].Prev = hMemNew;
}
aBlock[hMemNew].Prev = hMemIns;
aBlock[hMemIns].Next = hMemNew;
}
/* Keep track of number of blocks and av. memory */
GUI_ALLOC.NumUsedBlocks++;
GUI_ALLOC.NumFreeBlocks--;
if (GUI_ALLOC.NumFreeBlocksMin > GUI_ALLOC.NumFreeBlocks) {
GUI_ALLOC.NumFreeBlocksMin = GUI_ALLOC.NumFreeBlocks;
}
GUI_ALLOC.NumUsedBytes += size;
GUI_ALLOC.NumFreeBytes -= size;
if (GUI_ALLOC.NumFreeBytesMin > GUI_ALLOC.NumFreeBytes) {
GUI_ALLOC.NumFreeBytesMin = GUI_ALLOC.NumFreeBytes;
}
/* In order to be on the safe side, zeroinit ! */
memset(HMEM2PTR(hMemNew), 0, size);
return hMemNew;
}
GUI_HMEM GUI_ALLOC_Alloc(int size) {
GUI_HMEM hMem;
/* First make sure that init has been called */
GUI_LOCK();
GUI_DEBUG_LOG2("\nGUI_ALLOC_Alloc... requesting %d, %d avail", size, GUI_ALLOC.NumFreeBytes);
hMem = _Alloc(size);
GUI_DEBUG_LOG1("\nGUI_ALLOC_Alloc : Handle", hMem);
GUI_UNLOCK();
return hMem;
}
void GUI_ALLOC_Free(GUI_HMEM hMem) {
int Size;
if (hMem == GUI_HMEM_NULL) /* Note: This is not an error, it is permitted */
return;
GUI_LOCK();
GUI_DEBUG_LOG1("\nGUI_ALLOC_Free(%d)", hMem);
/* Do some error checking ... */
#if GUI_DEBUG_LEVEL>0
/* Block not allocated ? */
if (aBlock[hMem].Size==0) {
GUI_DEBUG_ERROROUT("GUI_ALLOC_Free(): Invalid hMem");
return;
}
#endif
Size = aBlock[hMem].Size;
#ifdef WIN32
memset(&GUI_Heap.abHeap[aBlock[hMem].Off], 0xcc, Size);
#endif
GUI_ALLOC.NumFreeBytes += Size;
GUI_ALLOC.NumUsedBytes -= Size;
aBlock[hMem].Size = 0;
{
int Next = aBlock[hMem].Next;
int Prev = aBlock[hMem].Prev;
aBlock[Prev].Next = Next;
if (Next)
aBlock[Next].Prev = Prev;
}
GUI_ALLOC.NumFreeBlocks++;
GUI_ALLOC.NumUsedBlocks--;
GUI_UNLOCK();
}
void* GUI_ALLOC_h2p (GUI_HMEM hMem) {
#if GUI_DEBUG_LEVEL>0
if (!hMem) {
GUI_DEBUG_ERROROUT("\n"__FILE__ " GUI_ALLOC_h2p: illegal argument (0 handle)");
return 0;
}
#endif
return HMEM2PTR(hMem);
}
void GUI_ALLOC_FreePtr(GUI_HMEM *ph) {
GUI_LOCK();
GUI_ALLOC_Free(*ph);
*ph =0;
GUI_UNLOCK();
}
/*
********************************************************************
*
* Exported info routines
*
********************************************************************
*/
int GUI_GetUsedMem(void) {
int NumUsedBytes=0;
int i;
GUI_LOCK();
CheckInit();
for (i=1; i; i = aBlock[i].Next) {
NumUsedBytes += aBlock[i].Size;
}
GUI_UNLOCK();
return NumUsedBytes;
}
int GUI_ALLOC_GetNumFreeBytes(void) {
CheckInit();
return GUI_ALLOC.NumFreeBytes;
}
/*
*************************************************
*
* GetMaxSize
*
*************************************************
Returns the biggest available blocksize
(without relocation)
*/
int GUI_ALLOC_GetMaxSize(void) {
int r=0;
int NumFreeBytes;
int i, iNext;
GUI_LOCK();
CheckInit();
for (i=0; (iNext =aBlock[i].Next) !=0; i= iNext) {
NumFreeBytes = aBlock[iNext].Off- (aBlock[i].Off+aBlock[i].Size);
if (NumFreeBytes > r) {
r = NumFreeBytes;
}
}
/* Check last block */
NumFreeBytes = (GUI_ALLOC_SIZE - (aBlock[i].Off+aBlock[i].Size));
if (NumFreeBytes > r) {
r = NumFreeBytes;
}
GUI_UNLOCK();
return r;
}