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MACOS.C
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C/C++ Source or Header
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1994-12-02
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3KB
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99 lines
/*
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.
by Patrick C. Beard.
*/
/* Boehm, July 28, 1994 10:35 am PDT */
#include <Resources.h>
#include <Memory.h>
#include <LowMem.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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[];
};
TemporaryMemoryHandle theTemporaryMemory = NULL;
static void GC_MacFreeTemporaryMemory(void);
Ptr GC_MacTemporaryNewPtr(Size 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;
}
// install an exit routine to clean up the memory used at the end.
if (firstTime) {
atexit(&GC_MacFreeTemporaryMemory);
firstTime = false;
}
return tempPtr;
}
static void GC_MacFreeTemporaryMemory()
{
long totalMemoryUsed = 0;
TemporaryMemoryHandle tempMemBlock = theTemporaryMemory;
while (tempMemBlock != NULL) {
TemporaryMemoryHandle nextBlock = (**tempMemBlock).nextBlock;
totalMemoryUsed += GetHandleSize((Handle)tempMemBlock);
DisposeHandle((Handle)tempMemBlock);
tempMemBlock = nextBlock;
}
theTemporaryMemory = NULL;
fprintf(stdout, "[total memory used: %ld bytes.]\n", totalMemoryUsed);
}