archie/tcl7.6/generic/tclCkalloc.c

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/*
* tclCkalloc.c --
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*
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* Interface to malloc and free that provides support for debugging problems
* involving overwritten, double freeing memory and loss of memory.
*
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* Copyright (c) 1991-1994 The Regents of the University of California.
* Copyright (c) 1994-1996 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
* This code contributed by Karl Lehenbauer and Mark Diekhans
*
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*
* SCCS: @(#) tclCkalloc.c 1.24 96/09/17 13:23:02
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*/
#include "tclInt.h"
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#include "tclPort.h"
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#define FALSE 0
#define TRUE 1
#ifdef TCL_MEM_DEBUG
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/*
* One of the following structures is allocated each time the
* "memory tag" command is invoked, to hold the current tag.
*/
typedef struct MemTag {
int refCount; /* Number of mem_headers referencing
* this tag. */
char string[4]; /* Actual size of string will be as
* large as needed for actual tag. This
* must be the last field in the structure. */
} MemTag;
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#define TAG_SIZE(bytesInString) ((unsigned) sizeof(MemTag) + bytesInString - 3)
static MemTag *curTagPtr = NULL;/* Tag to use in all future mem_headers
* (set by "memory tag" command). */
/*
* One of the following structures is allocated just before each
* dynamically allocated chunk of memory, both to record information
* about the chunk and to help detect chunk under-runs.
*/
#define LOW_GUARD_SIZE (8 + (32 - (sizeof(long) + sizeof(int)))%8)
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struct mem_header {
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struct mem_header *flink;
struct mem_header *blink;
MemTag *tagPtr; /* Tag from "memory tag" command; may be
* NULL. */
char *file;
long length;
int line;
unsigned char low_guard[LOW_GUARD_SIZE];
/* Aligns body on 8-byte boundary, plus
* provides at least 8 additional guard bytes
* to detect underruns. */
char body[1]; /* First byte of client's space. Actual
* size of this field will be larger than
* one. */
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};
static struct mem_header *allocHead = NULL; /* List of allocated structures */
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#define GUARD_VALUE 0141
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/*
* The following macro determines the amount of guard space *above* each
* chunk of memory.
*/
#define HIGH_GUARD_SIZE 8
/*
* The following macro computes the offset of the "body" field within
* mem_header. It is used to get back to the header pointer from the
* body pointer that's used by clients.
*/
#define BODY_OFFSET \
((unsigned long) (&((struct mem_header *) 0)->body))
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static int total_mallocs = 0;
static int total_frees = 0;
static int current_bytes_malloced = 0;
static int maximum_bytes_malloced = 0;
static int current_malloc_packets = 0;
static int maximum_malloc_packets = 0;
static int break_on_malloc = 0;
static int 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
/*
* Prototypes for procedures defined in this file:
*/
static int MemoryCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
/*
*----------------------------------------------------------------------
*
* dump_memory_info --
* Display the global memory management statistics.
*
*----------------------------------------------------------------------
*/
static void
dump_memory_info(outFile)
FILE *outFile;
{
fprintf(outFile,"total mallocs %10d\n",
total_mallocs);
fprintf(outFile,"total frees %10d\n",
total_frees);
fprintf(outFile,"current packets allocated %10d\n",
current_malloc_packets);
fprintf(outFile,"current bytes allocated %10d\n",
current_bytes_malloced);
fprintf(outFile,"maximum packets allocated %10d\n",
maximum_malloc_packets);
fprintf(outFile,"maximum bytes allocated %10d\n",
maximum_bytes_malloced);
}
/*
*----------------------------------------------------------------------
*
* ValidateMemory --
* Procedure to validate allocted memory guard zones.
*
*----------------------------------------------------------------------
*/
static void
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ValidateMemory(memHeaderP, file, line, nukeGuards)
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struct mem_header *memHeaderP;
char *file;
int line;
int nukeGuards;
{
unsigned char *hiPtr;
int idx;
int guard_failed = FALSE;
int byte;
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for (idx = 0; idx < LOW_GUARD_SIZE; idx++) {
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byte = *(memHeaderP->low_guard + idx);
if (byte != GUARD_VALUE) {
guard_failed = TRUE;
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fflush(stdout);
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byte &= 0xff;
fprintf(stderr, "low guard byte %d is 0x%x \t%c\n", idx, byte,
(isprint(UCHAR(byte)) ? byte : ' '));
}
}
if (guard_failed) {
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dump_memory_info(stderr);
fprintf(stderr, "low guard failed at %lx, %s %d\n",
(long unsigned int) memHeaderP->body, file, line);
fflush(stderr); /* In case name pointer is bad. */
fprintf(stderr, "%ld bytes allocated at (%s %d)\n", memHeaderP->length,
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memHeaderP->file, memHeaderP->line);
panic ("Memory validation failure");
}
hiPtr = (unsigned char *)memHeaderP->body + memHeaderP->length;
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for (idx = 0; idx < HIGH_GUARD_SIZE; idx++) {
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byte = *(hiPtr + idx);
if (byte != GUARD_VALUE) {
guard_failed = TRUE;
fflush (stdout);
byte &= 0xff;
fprintf(stderr, "hi guard byte %d is 0x%x \t%c\n", idx, byte,
(isprint(UCHAR(byte)) ? byte : ' '));
}
}
if (guard_failed) {
dump_memory_info (stderr);
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fprintf(stderr, "high guard failed at %lx, %s %d\n",
(long unsigned int) memHeaderP->body, file, line);
fflush(stderr); /* In case name pointer is bad. */
fprintf(stderr, "%ld bytes allocated at (%s %d)\n",
memHeaderP->length, memHeaderP->file,
memHeaderP->line);
panic("Memory validation failure");
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}
if (nukeGuards) {
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memset ((char *) memHeaderP->low_guard, 0, LOW_GUARD_SIZE);
memset ((char *) hiPtr, 0, HIGH_GUARD_SIZE);
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}
}
/*
*----------------------------------------------------------------------
*
* Tcl_ValidateAllMemory --
* Validates guard regions for all allocated memory.
*
*----------------------------------------------------------------------
*/
void
Tcl_ValidateAllMemory (file, line)
char *file;
int line;
{
struct mem_header *memScanP;
for (memScanP = allocHead; memScanP != NULL; memScanP = memScanP->flink)
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ValidateMemory(memScanP, file, line, FALSE);
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}
/*
*----------------------------------------------------------------------
*
* Tcl_DumpActiveMemory --
* Displays all allocated memory to stderr.
*
* Results:
* Return TCL_ERROR if an error accessing the file occures, `errno'
* will have the file error number left in it.
*----------------------------------------------------------------------
*/
int
Tcl_DumpActiveMemory (fileName)
char *fileName;
{
FILE *fileP;
struct mem_header *memScanP;
char *address;
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fileP = fopen(fileName, "w");
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if (fileP == NULL)
return TCL_ERROR;
for (memScanP = allocHead; memScanP != NULL; memScanP = memScanP->flink) {
address = &memScanP->body [0];
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fprintf(fileP, "%8lx - %8lx %7ld @ %s %d %s",
(long unsigned int) address,
(long unsigned int) address + memScanP->length - 1,
memScanP->length, memScanP->file, memScanP->line,
(memScanP->tagPtr == NULL) ? "" : memScanP->tagPtr->string);
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(void) fputc('\n', fileP);
}
fclose (fileP);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DbCkalloc - debugging ckalloc
*
* Allocate the requested amount of space plus some extra for
* guard bands at both ends of the request, plus a size, panicing
* if there isn't enough space, then write in the guard bands
* and return the address of the space in the middle that the
* user asked for.
*
* The second and third arguments are file and line, these contain
* the filename and line number corresponding to the caller.
* These are sent by the ckalloc macro; it uses the preprocessor
* autodefines __FILE__ and __LINE__.
*
*----------------------------------------------------------------------
*/
char *
Tcl_DbCkalloc(size, file, line)
unsigned int size;
char *file;
int line;
{
struct mem_header *result;
if (validate_memory)
Tcl_ValidateAllMemory (file, line);
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result = (struct mem_header *) TclpAlloc((unsigned)size +
sizeof(struct mem_header) + HIGH_GUARD_SIZE);
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if (result == NULL) {
fflush(stdout);
dump_memory_info(stderr);
panic("unable to alloc %d bytes, %s line %d", size, file,
line);
}
/*
* Fill in guard zones and size. Also initialize the contents of
* the block with bogus bytes to detect uses of initialized data.
* Link into allocated list.
*/
if (init_malloced_bodies) {
memset ((VOID *) result, GUARD_VALUE,
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size + sizeof(struct mem_header) + HIGH_GUARD_SIZE);
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} else {
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memset ((char *) result->low_guard, GUARD_VALUE, LOW_GUARD_SIZE);
memset (result->body + size, GUARD_VALUE, HIGH_GUARD_SIZE);
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}
result->length = size;
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result->tagPtr = curTagPtr;
if (curTagPtr != NULL) {
curTagPtr->refCount++;
}
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result->file = file;
result->line = line;
result->flink = allocHead;
result->blink = NULL;
if (allocHead != NULL)
allocHead->blink = result;
allocHead = result;
total_mallocs++;
if (trace_on_at_malloc && (total_mallocs >= trace_on_at_malloc)) {
(void) fflush(stdout);
fprintf(stderr, "reached malloc trace enable point (%d)\n",
total_mallocs);
fflush(stderr);
alloc_tracing = TRUE;
trace_on_at_malloc = 0;
}
if (alloc_tracing)
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fprintf(stderr,"ckalloc %lx %d %s %d\n",
(long unsigned int) result->body, size, file, line);
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if (break_on_malloc && (total_mallocs >= break_on_malloc)) {
break_on_malloc = 0;
(void) fflush(stdout);
fprintf(stderr,"reached malloc break limit (%d)\n",
total_mallocs);
fprintf(stderr, "program will now enter C debugger\n");
(void) fflush(stderr);
abort();
}
current_malloc_packets++;
if (current_malloc_packets > maximum_malloc_packets)
maximum_malloc_packets = current_malloc_packets;
current_bytes_malloced += size;
if (current_bytes_malloced > maximum_bytes_malloced)
maximum_bytes_malloced = current_bytes_malloced;
return result->body;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DbCkfree - debugging ckfree
*
* Verify that the low and high guards are intact, and if so
* then free the buffer else panic.
*
* The guards are erased after being checked to catch duplicate
* frees.
*
* The second and third arguments are file and line, these contain
* the filename and line number corresponding to the caller.
* These are sent by the ckfree macro; it uses the preprocessor
* autodefines __FILE__ and __LINE__.
*
*----------------------------------------------------------------------
*/
int
Tcl_DbCkfree(ptr, file, line)
char * ptr;
char *file;
int line;
{
/*
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* The following cast is *very* tricky. Must convert the pointer
* to an integer before doing arithmetic on it, because otherwise
* the arithmetic will be done differently (and incorrectly) on
* word-addressed machines such as Crays (will subtract only bytes,
* even though BODY_OFFSET is in words on these machines).
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*/
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struct mem_header *memp = (struct mem_header *)
(((unsigned long) ptr) - BODY_OFFSET);
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if (alloc_tracing)
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fprintf(stderr, "ckfree %lx %ld %s %d\n",
(long unsigned int) memp->body, memp->length, file, line);
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if (validate_memory)
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Tcl_ValidateAllMemory(file, line);
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ValidateMemory(memp, file, line, TRUE);
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if (init_malloced_bodies) {
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memset((VOID *) ptr, GUARD_VALUE, (size_t) memp->length);
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}
total_frees++;
current_malloc_packets--;
current_bytes_malloced -= memp->length;
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if (memp->tagPtr != NULL) {
memp->tagPtr->refCount--;
if ((memp->tagPtr->refCount == 0) && (curTagPtr != memp->tagPtr)) {
TclpFree((char *) memp->tagPtr);
}
}
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/*
* Delink from allocated list
*/
if (memp->flink != NULL)
memp->flink->blink = memp->blink;
if (memp->blink != NULL)
memp->blink->flink = memp->flink;
if (allocHead == memp)
allocHead = memp->flink;
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TclpFree((char *) memp);
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return 0;
}
/*
*--------------------------------------------------------------------
*
* Tcl_DbCkrealloc - debugging ckrealloc
*
* Reallocate a chunk of memory by allocating a new one of the
* right size, copying the old data to the new location, and then
* freeing the old memory space, using all the memory checking
* features of this package.
*
*--------------------------------------------------------------------
*/
char *
Tcl_DbCkrealloc(ptr, size, file, line)
char *ptr;
unsigned int size;
char *file;
int line;
{
char *new;
unsigned int copySize;
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/*
* See comment from Tcl_DbCkfree before you change the following
* line.
*/
struct mem_header *memp = (struct mem_header *)
(((unsigned long) ptr) - BODY_OFFSET);
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copySize = size;
if (copySize > memp->length) {
copySize = memp->length;
}
new = Tcl_DbCkalloc(size, file, line);
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memcpy((VOID *) new, (VOID *) ptr, (size_t) copySize);
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Tcl_DbCkfree(ptr, file, line);
return(new);
}
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/*
*----------------------------------------------------------------------
*
* Tcl_Alloc, et al. --
*
* These functions are defined in terms of the debugging versions
* when TCL_MEM_DEBUG is set.
*
* Results:
* Same as the debug versions.
*
* Side effects:
* Same as the debug versions.
*
*----------------------------------------------------------------------
*/
#undef Tcl_Alloc
#undef Tcl_Free
#undef Tcl_Realloc
char *
Tcl_Alloc(size)
unsigned int size;
{
return Tcl_DbCkalloc(size, "unknown", 0);
}
void
Tcl_Free(ptr)
char *ptr;
{
Tcl_DbCkfree(ptr, "unknown", 0);
}
char *
Tcl_Realloc(ptr, size)
char *ptr;
unsigned int size;
{
return Tcl_DbCkrealloc(ptr, size, "unknown", 0);
}
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/*
*----------------------------------------------------------------------
*
* MemoryCmd --
* Implements the TCL memory command:
* memory info
* memory display
* break_on_malloc count
* trace_on_at_malloc count
* trace on|off
* validate on|off
*
* Results:
* Standard TCL results.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
MemoryCmd (clientData, interp, argc, argv)
ClientData clientData;
Tcl_Interp *interp;
int argc;
char **argv;
{
char *fileName;
Tcl_DString buffer;
int result;
if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " option [args..]\"", (char *) NULL);
return TCL_ERROR;
}
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if (strcmp(argv[1],"active") == 0) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " active file\"", (char *) NULL);
return TCL_ERROR;
}
fileName = Tcl_TranslateFileName(interp, argv[2], &buffer);
if (fileName == NULL) {
return TCL_ERROR;
}
result = Tcl_DumpActiveMemory (fileName);
Tcl_DStringFree(&buffer);
if (result != TCL_OK) {
Tcl_AppendResult(interp, "error accessing ", argv[2],
(char *) NULL);
return TCL_ERROR;
}
return TCL_OK;
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}
if (strcmp(argv[1],"break_on_malloc") == 0) {
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if (argc != 3) {
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goto argError;
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}
if (Tcl_GetInt(interp, argv[2], &break_on_malloc) != TCL_OK) {
return TCL_ERROR;
}
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return TCL_OK;
}
if (strcmp(argv[1],"info") == 0) {
dump_memory_info(stdout);
return TCL_OK;
}
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if (strcmp(argv[1],"init") == 0) {
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if (argc != 3) {
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goto bad_suboption;
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}
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init_malloced_bodies = (strcmp(argv[2],"on") == 0);
return TCL_OK;
}
if (strcmp(argv[1],"tag") == 0) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" tag string\"", (char *) NULL);
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return TCL_ERROR;
}
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if ((curTagPtr != NULL) && (curTagPtr->refCount == 0)) {
TclpFree((char *) curTagPtr);
}
curTagPtr = (MemTag *) TclpAlloc(TAG_SIZE(strlen(argv[2])));
curTagPtr->refCount = 0;
strcpy(curTagPtr->string, argv[2]);
return TCL_OK;
}
if (strcmp(argv[1],"trace") == 0) {
if (argc != 3) {
goto bad_suboption;
}
alloc_tracing = (strcmp(argv[2],"on") == 0);
return TCL_OK;
}
if (strcmp(argv[1],"trace_on_at_malloc") == 0) {
if (argc != 3) {
goto argError;
}
if (Tcl_GetInt(interp, argv[2], &trace_on_at_malloc) != TCL_OK) {
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return TCL_ERROR;
}
return TCL_OK;
}
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if (strcmp(argv[1],"validate") == 0) {
if (argc != 3) {
goto bad_suboption;
}
validate_memory = (strcmp(argv[2],"on") == 0);
return TCL_OK;
}
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Tcl_AppendResult(interp, "bad option \"", argv[1],
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"\": should be active, break_on_malloc, info, init, ",
"tag, trace, trace_on_at_malloc, or validate", (char *) NULL);
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return TCL_ERROR;
argError:
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ", argv[1], " count\"", (char *) NULL);
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return TCL_ERROR;
bad_suboption:
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" ", argv[1], " on|off\"", (char *) NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* Tcl_InitMemory --
* Initialize the memory command.
*
*----------------------------------------------------------------------
*/
void
Tcl_InitMemory(interp)
Tcl_Interp *interp;
{
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Tcl_CreateCommand (interp, "memory", MemoryCmd, (ClientData) NULL,
(Tcl_CmdDeleteProc *) NULL);
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}
#else
/*
*----------------------------------------------------------------------
*
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* Tcl_Alloc --
* Interface to TclpAlloc when TCL_MEM_DEBUG is disabled. It does check
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* that memory was actually allocated.
*
*----------------------------------------------------------------------
*/
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char *
Tcl_Alloc (size)
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unsigned int size;
{
char *result;
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result = TclpAlloc(size);
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if (result == NULL)
panic("unable to alloc %d bytes", size);
return result;
}
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char *
Tcl_DbCkalloc(size, file, line)
unsigned int size;
char *file;
int line;
{
char *result;
result = (char *) TclpAlloc(size);
if (result == NULL) {
fflush(stdout);
panic("unable to alloc %d bytes, %s line %d", size, file,
line);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Realloc --
* Interface to TclpRealloc when TCL_MEM_DEBUG is disabled. It does
* check that memory was actually allocated.
*
*----------------------------------------------------------------------
*/
char *
Tcl_Realloc(ptr, size)
char *ptr;
unsigned int size;
{
char *result;
result = TclpRealloc(ptr, size);
if (result == NULL)
panic("unable to realloc %d bytes", size);
return result;
}
char *
Tcl_DbCkrealloc(ptr, size, file, line)
char *ptr;
unsigned int size;
char *file;
int line;
{
char *result;
result = (char *) TclpRealloc(ptr, size);
if (result == NULL) {
fflush(stdout);
panic("unable to realloc %d bytes, %s line %d", size, file,
line);
}
return result;
}
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/*
*----------------------------------------------------------------------
*
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* Tcl_Free --
* Interface to TclpFree when TCL_MEM_DEBUG is disabled. Done here
* rather in the macro to keep some modules from being compiled with
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* TCL_MEM_DEBUG enabled and some with it disabled.
*
*----------------------------------------------------------------------
*/
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void
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Tcl_Free (ptr)
char *ptr;
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{
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TclpFree(ptr);
}
int
Tcl_DbCkfree(ptr, file, line)
char * ptr;
char *file;
int line;
{
TclpFree(ptr);
return 0;
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}
/*
*----------------------------------------------------------------------
*
* Tcl_InitMemory --
* Dummy initialization for memory command, which is only available
* if TCL_MEM_DEBUG is on.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
void
Tcl_InitMemory(interp)
Tcl_Interp *interp;
{
}
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#undef Tcl_DumpActiveMemory
#undef Tcl_ValidateAllMemory
extern int Tcl_DumpActiveMemory _ANSI_ARGS_((char *fileName));
extern void Tcl_ValidateAllMemory _ANSI_ARGS_((char *file,
int line));
int
Tcl_DumpActiveMemory(fileName)
char *fileName;
{
return TCL_OK;
}
void
Tcl_ValidateAllMemory(file, line)
char *file;
int line;
{
}
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#endif