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- /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /*
- * The contents of this file are subject to the Netscape Public License
- * Version 1.0 (the "NPL"); you may not use this file except in
- * compliance with the NPL. You may obtain a copy of the NPL at
- * http://www.mozilla.org/NPL/
- *
- * Software distributed under the NPL is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
- * for the specific language governing rights and limitations under the
- * NPL.
- *
- * The Initial Developer of this code under the NPL is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1998 Netscape Communications Corporation. All Rights
- * Reserved.
- */
-
- #include "prlog.h"
- #include "prthread.h"
- #ifdef XP_MAC
- #include "pprthred.h"
- #else
- #include "private/pprthred.h"
- #endif
- #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
- */
-
- #if defined(_PR_PTHREADS)
- /* PR_ASSERT(!"I can't do this!"); */
- #else /* defined(_PR_PTHREADS) */
-
- /* 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;
-
- ptd = t->privateData;
- for (index = 0; index < t->tpdLength; index++, ptd++) {
- status = scanFun(t, (void**)ptd, 1, scanClosure);
- if (status != PR_SUCCESS)
- return status;
- }
- #endif /* defined(_PR_PTHREADS) */
-
- 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)
- {
- #if defined(XP_MAC)
- #pragma unused (i)
- #endif
- 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_PUBLIC_API(PRUword)
- PR_GetStackSpaceLeft(PRThread* t)
- {
- PRThread *current = PR_CurrentThread();
- 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);
- }
-