--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nspr/pr/src/misc/prthinfo.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,206 @@
+/* -*- 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);
+}