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