MacOS.c
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/*
MacOS.c
Some routines for the Macintosh OS port of the Hans-J. Boehm, Alan J. Demers
garbage collector.
<Revision History>
11/22/94 pcb StripAddress the temporary memory handle for 24-bit mode.
11/30/94 pcb Tracking all memory usage so we can deallocate it all at once.
02/10/96 pcb Added routine to perform a final collection when
unloading shared library.
by Patrick C. Beard.
*/
/* Boehm, February 15, 1996 2:55 pm PST */
#include <Resources.h>
#include <Memory.h>
#include <LowMem.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gc.h"
#include "gc_priv.h"
// use 'CODE' resource 0 to get exact location of the beginning of global space.
typedef struct {
unsigned long aboveA5;
unsigned long belowA5;
unsigned long JTSize;
unsigned long JTOffset;
} *CodeZeroPtr, **CodeZeroHandle;
void* GC_MacGetDataStart()
{
CodeZeroHandle code0 = (CodeZeroHandle)GetResource('CODE', 0);
if (code0) {
long belowA5Size = (**code0).belowA5;
ReleaseResource((Handle)code0);
return (LMGetCurrentA5() - belowA5Size);
}
fprintf(stderr, "Couldn't load the jump table.");
exit(-1);
return 0;
}
/* track the use of temporary memory so it can be freed all at once. */
typedef struct TemporaryMemoryBlock TemporaryMemoryBlock, **TemporaryMemoryHandle;
struct TemporaryMemoryBlock {
TemporaryMemoryHandle nextBlock;
char data[];
};
static TemporaryMemoryHandle theTemporaryMemory = NULL;
static Boolean firstTime = true;
void GC_MacFreeTemporaryMemory(void);
Ptr GC_MacTemporaryNewPtr(size_t size, Boolean clearMemory)
{
static Boolean firstTime = true;
OSErr result;
TemporaryMemoryHandle tempMemBlock;
Ptr tempPtr = nil;
tempMemBlock = (TemporaryMemoryHandle)TempNewHandle(size + sizeof(TemporaryMemoryBlock), &result);
if (tempMemBlock && result == noErr) {
HLockHi((Handle)tempMemBlock);
tempPtr = (**tempMemBlock).data;
if (clearMemory) memset(tempPtr, 0, size);
tempPtr = StripAddress(tempPtr);
// keep track of the allocated blocks.
(**tempMemBlock).nextBlock = theTemporaryMemory;
theTemporaryMemory = tempMemBlock;
}
# if !defined(SHARED_LIBRARY_BUILD)
// install an exit routine to clean up the memory used at the end.
if (firstTime) {
atexit(&GC_MacFreeTemporaryMemory);
firstTime = false;
}
# endif
return tempPtr;
}
extern word GC_fo_entries;
static void perform_final_collection()
{
unsigned i;
word last_fo_entries = 0;
/* adjust the stack bottom, because CFM calls us from another stack
location. */
GC_stackbottom = (ptr_t)&i;
/* try to collect and finalize everything in sight */
for (i = 0; i < 2 || GC_fo_entries < last_fo_entries; i++) {
last_fo_entries = GC_fo_entries;
GC_gcollect();
}
}
void GC_MacFreeTemporaryMemory()
{
# if defined(SHARED_LIBRARY_BUILD)
/* if possible, collect all memory, and invoke all finalizers. */
perform_final_collection();
# endif
if (theTemporaryMemory != NULL) {
long totalMemoryUsed = 0;
TemporaryMemoryHandle tempMemBlock = theTemporaryMemory;
while (tempMemBlock != NULL) {
TemporaryMemoryHandle nextBlock = (**tempMemBlock).nextBlock;
totalMemoryUsed += GetHandleSize((Handle)tempMemBlock);
DisposeHandle((Handle)tempMemBlock);
tempMemBlock = nextBlock;
}
theTemporaryMemory = NULL;
# if !defined(SILENT) && !defined(SHARED_LIBRARY_BUILD)
fprintf(stdout, "[total memory used: %ld bytes.]\n",
totalMemoryUsed);
fprintf(stdout, "[total collections: %ld.]\n", GC_gc_no);
# endif
}
}
#if __option(far_data)
void* GC_MacGetDataEnd()
{
CodeZeroHandle code0 = (CodeZeroHandle)GetResource('CODE', 0);
if (code0) {
long aboveA5Size = (**code0).aboveA5;
ReleaseResource((Handle)code0);
return (LMGetCurrentA5() + aboveA5Size);
}
fprintf(stderr, "Couldn't load the jump table.");
exit(-1);
return 0;
}
#endif /* __option(far_data) */