The Tor Browser: nsprpub/pr/src/misc/prthinfo.c@6474c204b198 (annotated)

nsprpub/pr/src/misc/prthinfo.c@6474c204b198 (annotated)

nsprpub/pr/src/misc/prthinfo.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "prlog.h"
 #include "prthread.h"
 #include "private/pprthred.h"
 #include "primpl.h"
 PR_IMPLEMENT(PRWord *)
 PR_GetGCRegisters(PRThread *t, int isCurrent, int *np)
 {
     return _MD_HomeGCRegisters(t, isCurrent, np);
 }
 PR_IMPLEMENT(PRStatus)
 PR_ThreadScanStackPointers(PRThread* t,
                            PRScanStackFun scanFun, void* scanClosure)
 {
     PRThread* current = PR_GetCurrentThread();
     PRWord *sp, *esp, *p0;
     int n;
     void **ptd;
     PRStatus status;
     PRUint32 index;
     int stack_end;
     /*
     ** Store the thread's registers in the thread structure so the GC
     ** can scan them. Then scan them.
     */
     p0 = _MD_HomeGCRegisters(t, t == current, &n);
     status = scanFun(t, (void**)p0, n, scanClosure);
     if (status != PR_SUCCESS)
         return status;
     /* Scan the C stack for pointers into the GC heap */
 #if defined(XP_PC) && defined(WIN16)
     /*
     ** Under WIN16, the stack of the current thread is always mapped into
     ** the "task stack" (at SS:xxxx).  So, if t is the current thread, scan
     ** the "task stack".  Otherwise, scan the "cached stack" of the inactive
     ** thread...
     */
     if (t == current) {
         sp  = (PRWord*) &stack_end;
         esp = (PRWord*) _pr_top_of_task_stack;
         PR_ASSERT(sp <= esp);
     } else {
         sp  = (PRWord*) PR_GetSP(t);
         esp = (PRWord*) t->stack->stackTop;
         PR_ASSERT((t->stack->stackSize == 0) ||
                   ((sp >  (PRWord*)t->stack->stackBottom) &&
                    (sp <= (PRWord*)t->stack->stackTop)));
     }
 #else   /* ! WIN16 */
 #ifdef HAVE_STACK_GROWING_UP
     if (t == current) {
         esp = (PRWord*) &stack_end;
     } else {
         esp = (PRWord*) PR_GetSP(t);
     }
     sp = (PRWord*) t->stack->stackTop;
     if (t->stack->stackSize) {
         PR_ASSERT((esp > (PRWord*)t->stack->stackTop) &&
                   (esp < (PRWord*)t->stack->stackBottom));
     }
 #else   /* ! HAVE_STACK_GROWING_UP */
     if (t == current) {
         sp = (PRWord*) &stack_end;
     } else {
         sp = (PRWord*) PR_GetSP(t);
     }
     esp = (PRWord*) t->stack->stackTop;
     if (t->stack->stackSize) {
         PR_ASSERT((sp > (PRWord*)t->stack->stackBottom) &&
                   (sp < (PRWord*)t->stack->stackTop));
     }
 #endif  /* ! HAVE_STACK_GROWING_UP */
 #endif  /* ! WIN16 */
 #if defined(WIN16)
     {
         prword_t scan;
         prword_t limit;
         scan = (prword_t) sp;
         limit = (prword_t) esp;
         while (scan < limit) {
             prword_t *test;
             test = *((prword_t **)scan);
             status = scanFun(t, (void**)&test, 1, scanClosure);
             if (status != PR_SUCCESS)
                 return status;
             scan += sizeof(char);
         }
     }
 #else
     if (sp < esp) {
         status = scanFun(t, (void**)sp, esp - sp, scanClosure);
         if (status != PR_SUCCESS)
             return status;
     }
 #endif
     /*
     ** Mark all of the per-thread-data items attached to this thread
     **
     ** The execution environment better be accounted for otherwise it
     ** will be collected
     */
     status = scanFun(t, (void**)&t->environment, 1, scanClosure);
     if (status != PR_SUCCESS)
         return status;
     /* if thread is not allocated on stack, this is redundant. */
     ptd = t->privateData;
     for (index = 0; index < t->tpdLength; index++, ptd++) {
         status = scanFun(t, (void**)ptd, 1, scanClosure);
         if (status != PR_SUCCESS)
             return status;
     }
     return PR_SUCCESS;
 }
 /* transducer for PR_EnumerateThreads */
 typedef struct PRScanStackData {
     PRScanStackFun      scanFun;
     void*               scanClosure;
 } PRScanStackData;
 static PRStatus PR_CALLBACK
 pr_ScanStack(PRThread* t, int i, void* arg)
 {
     PRScanStackData* data = (PRScanStackData*)arg;
     return PR_ThreadScanStackPointers(t, data->scanFun, data->scanClosure);
 }
 PR_IMPLEMENT(PRStatus)
 PR_ScanStackPointers(PRScanStackFun scanFun, void* scanClosure)
 {
     PRScanStackData data;
     data.scanFun = scanFun;
     data.scanClosure = scanClosure;
     return PR_EnumerateThreads(pr_ScanStack, &data);
 }
 PR_IMPLEMENT(PRUword)
 PR_GetStackSpaceLeft(PRThread* t)
 {
     PRThread *current = PR_GetCurrentThread();
     PRWord *sp, *esp;
     int stack_end;
 #if defined(WIN16)
     /*
     ** Under WIN16, the stack of the current thread is always mapped into
     ** the "task stack" (at SS:xxxx).  So, if t is the current thread, scan
     ** the "task stack".  Otherwise, scan the "cached stack" of the inactive
     ** thread...
     */
     if (t == current) {
         sp  = (PRWord*) &stack_end;
         esp = (PRWord*) _pr_top_of_task_stack;
         PR_ASSERT(sp <= esp);
     } else {
         sp  = (PRWord*) PR_GetSP(t);
         esp = (PRWord*) t->stack->stackTop;
 	PR_ASSERT((t->stack->stackSize == 0) ||
                  ((sp >  (PRWord*)t->stack->stackBottom) &&
 		  (sp <= (PRWord*)t->stack->stackTop)));
     }
 #else   /* ! WIN16 */
 #ifdef HAVE_STACK_GROWING_UP
     if (t == current) {
         esp = (PRWord*) &stack_end;
     } else {
         esp = (PRWord*) PR_GetSP(t);
     }
     sp = (PRWord*) t->stack->stackTop;
     if (t->stack->stackSize) {
         PR_ASSERT((esp > (PRWord*)t->stack->stackTop) &&
                   (esp < (PRWord*)t->stack->stackBottom));
     }
 #else   /* ! HAVE_STACK_GROWING_UP */
     if (t == current) {
         sp = (PRWord*) &stack_end;
     } else {
         sp = (PRWord*) PR_GetSP(t);
     }
     esp = (PRWord*) t->stack->stackTop;
     if (t->stack->stackSize) {
 	PR_ASSERT((sp > (PRWord*)t->stack->stackBottom) &&
 		  (sp < (PRWord*)t->stack->stackTop));
     }
 #endif  /* ! HAVE_STACK_GROWING_UP */
 #endif  /* ! WIN16 */
     return (PRUword)t->stack->stackSize - ((PRWord)esp - (PRWord)sp);
 }

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nsprpub/pr/src/misc/prthinfo.c@6474c204b198 (annotated)

nsprpub/pr/src/misc/prthinfo.c