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# include "system.h"
# include "comsupport.h"
# include "backendsupport.h"
/*
Utilities
=========
*/
# ifdef _WINDOWS_
# undef _WINDOWS_
# include <windows.h>
# define Debugger() DebugBreak();
# else
# define Debugger() { * (int *) NULL = 0; }
# endif
void
AssertionFailed (char *conditionString, char *file, int line)
{
FPrintF (StdError, "Error in backend: File %s, Line %d (%s)\n", file, line, conditionString);
Debugger ();
} /* AssertionFailed */
/*
Memory management
=================
*/
static enum {kMemoryInitClear, kMemoryInitSet} gMemoryInit = kMemoryInitSet;
# define kConvertBufferSize (32 * 1024)
typedef struct convert_buffer ConvertBufferS, *ConvertBufferP;
struct convert_buffer
{
ConvertBufferP cb_next;
char cb_memory [kConvertBufferSize];
};
static void
InvalidateMemory (void *memory, size_t size)
{
char value, *p;
int i;
switch (gMemoryInit)
{
case kMemoryInitClear:
value = 0;
break;
case kMemoryInitSet:
value = ~0;
break;
default:
Assert (False);
break;
}
p = memory;
for (i = 0; i < size; i++)
*p++ = value;
} /* InvalidateMemory */
static ConvertBufferP gFirstBuffer = NULL, gCurrentBuffer = NULL;
static char *gMemory;
static long gBytesLeft = 0;
static void
AllocConvertBuffer (void)
{
ConvertBufferP newBuffer;
newBuffer = (ConvertBufferP) malloc (sizeof (ConvertBufferS));
if (newBuffer == NULL)
FatalCompError ("backendsupport.c", "AllocConvertBuffer", "out of memory");
if (gFirstBuffer == NULL)
gCurrentBuffer = gFirstBuffer = newBuffer;
else
gCurrentBuffer = gCurrentBuffer->cb_next = newBuffer;
gCurrentBuffer->cb_next = NULL;
gBytesLeft = kConvertBufferSize;
gMemory = gCurrentBuffer->cb_memory;
InvalidateMemory (gMemory, kConvertBufferSize);
if (gFirstBuffer == NULL)
gFirstBuffer = gCurrentBuffer;
} /* AllocConvertBuffer */
void
FreeConvertBuffers (void)
{
ConvertBufferP buffer;
buffer = gFirstBuffer;
while (buffer != NULL)
{
ConvertBufferP nextBuffer;
nextBuffer = buffer->cb_next;
InvalidateMemory (buffer, sizeof (ConvertBufferS));
free (buffer);
buffer = nextBuffer;
}
gFirstBuffer = NULL;
gCurrentBuffer = NULL;
gBytesLeft = NULL;
} /* FreeConvertBuffers */
void *
ConvertAlloc (SizeT size)
{
void *memory;
size = (size+3) & ~3;
if (size > gBytesLeft)
AllocConvertBuffer ();
Assert (size <= gBytesLeft);
memory = gMemory;
gBytesLeft -= size;
gMemory += size;
return ((void *) memory);
} /* ConvertAlloc */
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