* this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * This code contributed by Karl Lehenbauer and Mark Diekhans
 */

#include "tclInt.h"

#define FALSE	0
#define TRUE	1

#undef Tcl_Alloc
#undef Tcl_Free
#undef Tcl_Realloc
#undef Tcl_AttemptAlloc
#undef Tcl_AttemptRealloc

#ifdef TCL_MEM_DEBUG

static size_t total_frees = 0;
static size_t current_bytes_malloced = 0;
static size_t maximum_bytes_malloced = 0;
static size_t current_malloc_packets = 0;
static size_t  maximum_malloc_packets = 0;
static size_t break_on_malloc = 0;
static size_t trace_on_at_malloc = 0;
static int alloc_tracing = FALSE;
static int init_malloced_bodies = TRUE;
#ifdef MEM_VALIDATE
static int validate_memory = TRUE;
#else
static int validate_memory = FALSE;
#endif

/*
 * The following variable indicates to TclFinalizeMemorySubsystem() that it
 * should dump out the state of memory before exiting. If the value is
 * non-NULL, it gives the name of the file in which to dump memory usage
 * information.

/*
 * Mutex to serialize allocations. This is a low-level mutex that must be
 * explicitly initialized. This is necessary because the self initializing
 * mutexes use Tcl_Alloc...
 */

static Tcl_Mutex *ckallocMutexPtr;
static int ckallocInit = 0;

/*
 *----------------------------------------------------------------------
 *
 * TclInitDbCkalloc --
 *
 *	Initialize the locks used by the allocator. This is only appropriate
 *	to call in a single threaded environment, such as during
 *	Tcl_InitSubsystems.
 *
 *----------------------------------------------------------------------
 */

void
TclInitDbCkalloc(void)
{
    if (!ckallocInit) {
	ckallocInit = 1;
	ckallocMutexPtr = Tcl_GetAllocMutex();
#if !TCL_THREADS
	/* Silence compiler warning */
	(void)ckallocMutexPtr;
#endif
    }
}

ValidateMemory(
    struct mem_header *memHeaderP,
				/* Memory chunk to validate */
    const char *file,		/* File containing the call to
				 * Tcl_ValidateAllMemory */
    int line,			/* Line number of call to
				 * Tcl_ValidateAllMemory */
    int nukeGuards)		/* If non-zero, indicates that the memory
				 * guards are to be reset to 0 after they have
				 * been printed */
{
    unsigned char *hiPtr;
    size_t idx;
    int guard_failed = FALSE;
    int byte;

    for (idx = 0; idx < LOW_GUARD_SIZE; idx++) {
	byte = *(memHeaderP->low_guard + idx);
	if (byte != GUARD_VALUE) {
	    guard_failed = TRUE;
	    fflush(stdout);
	    byte &= 0xFF;
	    fprintf(stderr, "low guard byte %" TCL_Z_MODIFIER "u is 0x%x  \t%c\n", idx, byte,
		    (isprint(UCHAR(byte)) ? byte : ' ')); /* INTL: bytes */
	}
    }
    if (guard_failed) {
	TclDumpMemoryInfo(stderr, 0);
	fprintf(stderr, "low guard failed at %p, %s %d\n",
		memHeaderP->body, file, line);
	fflush(stderr);			/* In case name pointer is bad. */
	fprintf(stderr, "%" TCL_Z_MODIFIER "u bytes allocated at (%s %d)\n", memHeaderP->length,
		memHeaderP->file, memHeaderP->line);
	Tcl_Panic("Memory validation failure");
    }

    hiPtr = (unsigned char *)memHeaderP->body + memHeaderP->length;
    for (idx = 0; idx < HIGH_GUARD_SIZE; idx++) {
	byte = hiPtr[idx];
	if (byte != GUARD_VALUE) {
	    guard_failed = TRUE;
	    fflush(stdout);
	    byte &= 0xFF;
	    fprintf(stderr, "hi guard byte %" TCL_Z_MODIFIER "u is 0x%x  \t%c\n", idx, byte,
		    (isprint(UCHAR(byte)) ? byte : ' ')); /* INTL: bytes */
	}
    }

    struct mem_header *memScanP;

    if (!ckallocInit) {
	TclInitDbCkalloc();
    }
    Tcl_MutexLock(ckallocMutexPtr);
    for (memScanP = allocHead; memScanP != NULL; memScanP = memScanP->flink) {
	ValidateMemory(memScanP, file, line, FALSE);
    }
    Tcl_MutexUnlock(ckallocMutexPtr);
}

/*
 *----------------------------------------------------------------------
 *

    total_mallocs++;
    if (trace_on_at_malloc && (total_mallocs >= trace_on_at_malloc)) {
	(void) fflush(stdout);
	fprintf(stderr, "reached malloc trace enable point (%" TCL_Z_MODIFIER "u)\n",
		total_mallocs);
	fflush(stderr);
	alloc_tracing = TRUE;
	trace_on_at_malloc = 0;
    }

    if (alloc_tracing) {
	fprintf(stderr,"Tcl_Alloc %p %" TCL_Z_MODIFIER "u %s %d\n",
		result->body, size, file, line);
    }

    total_mallocs++;
    if (trace_on_at_malloc && (total_mallocs >= trace_on_at_malloc)) {
	(void) fflush(stdout);
	fprintf(stderr, "reached malloc trace enable point (%" TCL_Z_MODIFIER "u)\n",
		total_mallocs);
	fflush(stderr);
	alloc_tracing = TRUE;
	trace_on_at_malloc = 0;
    }

    if (alloc_tracing) {
	fprintf(stderr,"Tcl_Alloc %p %" TCL_Z_MODIFIER "u %s %d\n",
		result->body, size, file, line);
    }

    }

    if (validate_memory) {
	Tcl_ValidateAllMemory(file, line);
    }

    Tcl_MutexLock(ckallocMutexPtr);
    ValidateMemory(memp, file, line, TRUE);
    if (init_malloced_bodies) {
	memset(ptr, GUARD_VALUE, memp->length);
    }

    total_frees++;
    current_malloc_packets--;
    current_bytes_malloced -= memp->length;