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-rw-r--r--mac/tclMacAlloc.c412
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diff --git a/mac/tclMacAlloc.c b/mac/tclMacAlloc.c
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--- a/mac/tclMacAlloc.c
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-/*
- * tclMacAlloc.c --
- *
- * This is a very fast storage allocator. It allocates blocks of a
- * small number of different sizes, and keeps free lists of each size.
- * Blocks that don't exactly fit are passed up to the next larger size.
- * Blocks over a certain size are directly allocated by calling NewPtr.
- *
- * Copyright (c) 1983 Regents of the University of California.
- * Copyright (c) 1996-1997 Sun Microsystems, Inc.
- *
- * Portions contributed by Chris Kingsley, Jack Jansen and Ray Johnson
- *.
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tclMacAlloc.c,v 1.5 2001/11/23 01:27:09 das Exp $
- */
-
-#include "tclInt.h"
-#include "tclMacInt.h"
-#include <Memory.h>
-#include <Gestalt.h>
-#include <stdlib.h>
-#include <string.h>
-
-
-/*
- * Flags that are used by ConfigureMemory to define how the allocator
- * should work. They can be or'd together.
- */
-#define MEMORY_ALL_SYS 1 /* All memory should come from the system
-heap. */
-#define MEMORY_DONT_USE_TEMPMEM 2 /* Don't use temporary memory but system memory. */
-
-/*
- * Amount of space to leave in the application heap for the Toolbox to work.
- */
-
-#define TOOLBOX_SPACE (512 * 1024)
-
-static int memoryFlags = 0;
-static Handle toolGuardHandle = NULL;
- /* This handle must be around so that we don't
- * have NewGWorld failures. This handle is
- * purgeable. Before we allocate any blocks,
- * we see if this handle is still around.
- * If it is not, then we try to get it again.
- * If we can get it, we lock it and try
- * to do the normal allocation, unlocking on
- * the way out. If we can't, we go to the
- * system heap directly. */
-
-static int tclUseMemTracking = 0; /* Are we tracking memory allocations?
- * On recent versions of the MacOS this
- * is no longer necessary, as we can use
- * temporary memory which is freed by the
- * OS after a quit or crash. */
-
-static size_t tclExtraHdlSize = 0; /* Size of extra memory allocated at the start
- * of each block when using memory tracking
- * ( == 0 otherwise) */
-
-/*
- * The following typedef and variable are used to keep track of memory
- * blocks that are allocated directly from the System Heap. These chunks
- * of memory must always be freed - even if we crash.
- */
-
-typedef struct listEl {
- Handle memoryHandle;
- struct listEl * next;
- struct listEl * prec;
-} ListEl;
-
-static ListEl * systemMemory = NULL;
-static ListEl * appMemory = NULL;
-
-/*
- * Prototypes for functions used only in this file.
- */
-
-static pascal void CleanUpExitProc _ANSI_ARGS_((void));
-void ConfigureMemory _ANSI_ARGS_((int flags));
-void FreeAllMemory _ANSI_ARGS_((void));
-
-/*
- *----------------------------------------------------------------------
- *
- * TclpSysRealloc --
- *
- * This function reallocates a chunk of system memory. If the
- * chunk is already big enough to hold the new block, then no
- * allocation happens.
- *
- * Results:
- * Returns a pointer to the newly allocated block.
- *
- * Side effects:
- * May copy the contents of the original block to the new block
- * and deallocate the original block.
- *
- *----------------------------------------------------------------------
- */
-
-VOID *
-TclpSysRealloc(
- VOID *oldPtr, /* Original block */
- unsigned int size) /* New size of block. */
-{
- Handle hand;
- void *newPtr;
- int maxsize;
- OSErr err;
-
- if (tclUseMemTracking) {
- hand = ((ListEl *) ((Ptr) oldPtr - tclExtraHdlSize))->memoryHandle;
- } else {
- hand = RecoverHandle((Ptr) oldPtr);
- }
- maxsize = GetHandleSize(hand) - sizeof(Handle);
- if (maxsize < size) {
- HUnlock(hand);
- SetHandleSize(hand,size + tclExtraHdlSize);
- err = MemError();
- HLock(hand);
- if(err==noErr){
- newPtr=(*hand + tclExtraHdlSize);
- } else {
- newPtr = TclpSysAlloc(size, 1);
- if(newPtr!=NULL) {
- memmove(newPtr, oldPtr, maxsize);
- TclpSysFree(oldPtr);
- }
- }
- } else {
- newPtr = oldPtr;
- }
- return newPtr;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * TclpSysAlloc --
- *
- * Allocate a new block of memory free from the System.
- *
- * Results:
- * Returns a pointer to a new block of memory.
- *
- * Side effects:
- * May obtain memory from app or sys space. Info is added to
- * overhead lists etc.
- *
- *----------------------------------------------------------------------
- */
-
-VOID *
-TclpSysAlloc(
- long size, /* Size of block to allocate. */
- int isBin) /* Is this a bin allocation? */
-{
- Handle hand = NULL;
- ListEl * newMemoryRecord;
- int isSysMem = 0;
- static int initialized=0;
-
- if (!initialized) {
- long response = 0;
- OSErr err = noErr;
- int useTempMem = 0;
-
- /* Check if we can use temporary memory */
- initialized=1;
- err = Gestalt(gestaltOSAttr, &response);
- if (err == noErr) {
- useTempMem = response & (1 << gestaltRealTempMemory);
- }
- tclUseMemTracking = !useTempMem || (memoryFlags & MEMORY_DONT_USE_TEMPMEM);
- if(tclUseMemTracking) {
- tclExtraHdlSize = sizeof(ListEl);
- /*
- * We are allocating memory directly from the system
- * heap. We need to install an exit handle
- * to ensure the memory is cleaned up.
- */
- TclMacInstallExitToShellPatch(CleanUpExitProc);
- }
- }
-
- if (!(memoryFlags & MEMORY_ALL_SYS)) {
-
- /*
- * If the guard handle has been purged, throw it away and try
- * to allocate it again.
- */
-
- if ((toolGuardHandle != NULL) && (*toolGuardHandle == NULL)) {
- DisposeHandle(toolGuardHandle);
- toolGuardHandle = NULL;
- }
-
- /*
- * If we have never allocated the guard handle, or it was purged
- * and thrown away, then try to allocate it again.
- */
-
- if (toolGuardHandle == NULL) {
- toolGuardHandle = NewHandle(TOOLBOX_SPACE);
- if (toolGuardHandle != NULL) {
- HLock(toolGuardHandle);
- HPurge(toolGuardHandle);
- }
- }
-
- /*
- * If we got the handle, lock it and do our allocation.
- */
-
- if (toolGuardHandle != NULL) {
- HLock(toolGuardHandle);
- hand = NewHandle(size + tclExtraHdlSize);
- HUnlock(toolGuardHandle);
- }
- }
- if (hand == NULL) {
- /*
- * Ran out of memory in application space. Lets try to get
- * more memory from system. Otherwise, we return NULL to
- * denote failure.
- */
- if(!tclUseMemTracking) {
- /* Use Temporary Memory instead of System Heap when available */
- OSErr err;
- isBin = 1; /* always HLockHi TempMemHandles */
- hand = TempNewHandle(size + tclExtraHdlSize,&err);
- if(err!=noErr) { hand=NULL; }
- } else {
- /* Use system heap when tracking memory */
- isSysMem=1;
- isBin = 0;
- hand = NewHandleSys(size + tclExtraHdlSize);
- }
- }
- if (hand == NULL) {
- return NULL;
- }
- if (isBin) {
- HLockHi(hand);
- } else {
- HLock(hand);
- }
- if(tclUseMemTracking) {
- /* Only need to do this when tracking memory */
- newMemoryRecord = (ListEl *) *hand;
- newMemoryRecord->memoryHandle = hand;
- newMemoryRecord->prec = NULL;
- if(isSysMem) {
- newMemoryRecord->next = systemMemory;
- systemMemory = newMemoryRecord;
- } else {
- newMemoryRecord->next = appMemory;
- appMemory = newMemoryRecord;
- }
- if(newMemoryRecord->next!=NULL) {
- newMemoryRecord->next->prec=newMemoryRecord;
- }
- }
-
- return (*hand + tclExtraHdlSize);
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * TclpSysFree --
- *
- * Free memory that we allocated back to the system.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Memory is freed.
- *
- *----------------------------------------------------------------------
- */
-
-void
-TclpSysFree(
- void * ptr) /* Free this system memory. */
-{
- if(tclUseMemTracking) {
- /* Only need to do this when tracking memory */
- ListEl *memRecord;
-
- memRecord = (ListEl *) ((Ptr) ptr - tclExtraHdlSize);
- /* Remove current record from linked list */
- if(memRecord->next!=NULL) {
- memRecord->next->prec=memRecord->prec;
- }
- if(memRecord->prec!=NULL) {
- memRecord->prec->next=memRecord->next;
- }
- if(memRecord==appMemory) {
- appMemory=memRecord->next;
- } else if(memRecord==systemMemory) {
- systemMemory=memRecord->next;
- }
- DisposeHandle(memRecord->memoryHandle);
- } else {
- DisposeHandle(RecoverHandle((Ptr) ptr));
- }
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * CleanUpExitProc --
- *
- * This procedure is invoked as an exit handler when ExitToShell
- * is called. It removes any memory that was allocated directly
- * from the system heap. This must be called when the application
- * quits or the memory will never be freed.
- *
- * Results:
- * None.
- *
- * Side effects:
- * May free memory in the system heap.
- *
- *----------------------------------------------------------------------
- */
-
-static pascal void
-CleanUpExitProc()
-{
- ListEl * memRecord;
-
- if(tclUseMemTracking) {
- /* Only need to do this when tracking memory */
- while (systemMemory != NULL) {
- memRecord = systemMemory;
- systemMemory = memRecord->next;
- DisposeHandle(memRecord->memoryHandle);
- }
- }
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * FreeAllMemory --
- *
- * This procedure frees all memory blocks allocated by the memory
- * sub-system. Make sure you don't have any code that references
- * any malloced data!
- *
- * Results:
- * None.
- *
- * Side effects:
- * Frees all memory allocated by TclpAlloc.
- *
- *----------------------------------------------------------------------
- */
-
-void
-FreeAllMemory()
-{
- ListEl * memRecord;
-
- if(tclUseMemTracking) {
- /* Only need to do this when tracking memory */
- while (systemMemory != NULL) {
- memRecord = systemMemory;
- systemMemory = memRecord->next;
- DisposeHandle(memRecord->memoryHandle);
- }
- while (appMemory != NULL) {
- memRecord = appMemory;
- appMemory = memRecord->next;
- DisposeHandle(memRecord->memoryHandle);
- }
- }
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * ConfigureMemory --
- *
- * This procedure sets certain flags in this file that control
- * how memory is allocated and managed. This call must be made
- * before any call to TclpAlloc is made.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Certain state will be changed.
- *
- *----------------------------------------------------------------------
- */
-
-void
-ConfigureMemory(
- int flags) /* Flags that control memory alloc scheme. */
-{
- memoryFlags = flags;
-}
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