138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/*
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MacOS.c
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Some routines for the Macintosh OS port of the Hans-J. Boehm, Alan J. Demers
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garbage collector.
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<Revision History>
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11/22/94 pcb StripAddress the temporary memory handle for 24-bit mode.
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11/30/94 pcb Tracking all memory usage so we can deallocate it all at once.
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02/10/96 pcb Added routine to perform a final collection when
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unloading shared library.
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by Patrick C. Beard.
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*/
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/* Boehm, February 15, 1996 2:55 pm PST */
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#include <Resources.h>
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#include <Memory.h>
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#include <LowMem.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "gc.h"
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#include "gc_priv.h"
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// use 'CODE' resource 0 to get exact location of the beginning of global space.
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typedef struct {
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unsigned long aboveA5;
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unsigned long belowA5;
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unsigned long JTSize;
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unsigned long JTOffset;
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} *CodeZeroPtr, **CodeZeroHandle;
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void* GC_MacGetDataStart()
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{
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CodeZeroHandle code0 = (CodeZeroHandle)GetResource('CODE', 0);
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if (code0) {
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long belowA5Size = (**code0).belowA5;
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ReleaseResource((Handle)code0);
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return (LMGetCurrentA5() - belowA5Size);
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}
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fprintf(stderr, "Couldn't load the jump table.");
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exit(-1);
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return 0;
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}
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/* track the use of temporary memory so it can be freed all at once. */
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typedef struct TemporaryMemoryBlock TemporaryMemoryBlock, **TemporaryMemoryHandle;
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struct TemporaryMemoryBlock {
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TemporaryMemoryHandle nextBlock;
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char data[];
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};
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static TemporaryMemoryHandle theTemporaryMemory = NULL;
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static Boolean firstTime = true;
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void GC_MacFreeTemporaryMemory(void);
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Ptr GC_MacTemporaryNewPtr(size_t size, Boolean clearMemory)
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{
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static Boolean firstTime = true;
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OSErr result;
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TemporaryMemoryHandle tempMemBlock;
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Ptr tempPtr = nil;
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tempMemBlock = (TemporaryMemoryHandle)TempNewHandle(size + sizeof(TemporaryMemoryBlock), &result);
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if (tempMemBlock && result == noErr) {
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HLockHi((Handle)tempMemBlock);
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tempPtr = (**tempMemBlock).data;
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if (clearMemory) memset(tempPtr, 0, size);
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tempPtr = StripAddress(tempPtr);
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// keep track of the allocated blocks.
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(**tempMemBlock).nextBlock = theTemporaryMemory;
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theTemporaryMemory = tempMemBlock;
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}
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# if !defined(SHARED_LIBRARY_BUILD)
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// install an exit routine to clean up the memory used at the end.
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if (firstTime) {
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atexit(&GC_MacFreeTemporaryMemory);
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firstTime = false;
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}
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# endif
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return tempPtr;
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}
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extern word GC_fo_entries;
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static void perform_final_collection()
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{
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unsigned i;
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word last_fo_entries = 0;
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/* adjust the stack bottom, because CFM calls us from another stack
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location. */
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GC_stackbottom = (ptr_t)&i;
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/* try to collect and finalize everything in sight */
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for (i = 0; i < 2 || GC_fo_entries < last_fo_entries; i++) {
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last_fo_entries = GC_fo_entries;
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GC_gcollect();
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}
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}
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void GC_MacFreeTemporaryMemory()
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{
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# if defined(SHARED_LIBRARY_BUILD)
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/* if possible, collect all memory, and invoke all finalizers. */
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perform_final_collection();
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# endif
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if (theTemporaryMemory != NULL) {
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long totalMemoryUsed = 0;
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TemporaryMemoryHandle tempMemBlock = theTemporaryMemory;
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while (tempMemBlock != NULL) {
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TemporaryMemoryHandle nextBlock = (**tempMemBlock).nextBlock;
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totalMemoryUsed += GetHandleSize((Handle)tempMemBlock);
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DisposeHandle((Handle)tempMemBlock);
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tempMemBlock = nextBlock;
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}
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theTemporaryMemory = NULL;
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# if !defined(SILENT) && !defined(SHARED_LIBRARY_BUILD)
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fprintf(stdout, "[total memory used: %ld bytes.]\n",
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totalMemoryUsed);
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fprintf(stdout, "[total collections: %ld.]\n", GC_gc_no);
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# endif
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}
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}
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