1 files changed, 345 insertions, 0 deletions
diff --git a/tools/node_modules/expresso/deps/jscoverage/js/jsutil.cpp b/tools/node_modules/expresso/deps/jscoverage/js/jsutil.cpp
new file mode 100644
index 0000000..5d7eb88
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+++ b/tools/node_modules/expresso/deps/jscoverage/js/jsutil.cpp
@@ -0,0 +1,345 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   IBM Corp.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+ * PR assertion checker.
+ */
+#include "jsstddef.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include "jstypes.h"
+#include "jsutil.h"
+
+#ifdef WIN32
+#    include <windows.h>
+#endif
+
+JS_PUBLIC_API(void) JS_Assert(const char *s, const char *file, JSIntn ln)
+{
+    fprintf(stderr, "Assertion failure: %s, at %s:%d\n", s, file, ln);
+#if defined(WIN32)
+    DebugBreak();
+    exit(3);
+#elif defined(XP_OS2) || (defined(__GNUC__) && defined(__i386))
+    asm("int $3");
+#endif
+    abort();
+}
+
+#ifdef JS_BASIC_STATS
+
+#include <math.h>
+#include <string.h>
+#include "jscompat.h"
+#include "jsbit.h"
+
+/*
+ * Histogram bins count occurrences of values <= the bin label, as follows:
+ *
+ *   linear:  0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  10 or more
+ *     2**x:  0,   1,   2,   4,   8,  16,  32,  64, 128, 256, 512 or more
+ *    10**x:  0,   1,  10, 100, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9 or more
+ *
+ * We wish to count occurrences of 0 and 1 values separately, always.
+ */
+static uint32
+BinToVal(uintN logscale, uintN bin)
+{
+    JS_ASSERT(bin <= 10);
+    if (bin <= 1 || logscale == 0)
+        return bin;
+    --bin;
+    if (logscale == 2)
+        return JS_BIT(bin);
+    JS_ASSERT(logscale == 10);
+    return (uint32) pow(10.0, (double) bin);
+}
+
+static uintN
+ValToBin(uintN logscale, uint32 val)
+{
+    uintN bin;
+
+    if (val <= 1)
+        return val;
+    bin = (logscale == 10)
+          ? (uintN) ceil(log10((double) val))
+          : (logscale == 2)
+          ? (uintN) JS_CeilingLog2(val)
+          : val;
+    return JS_MIN(bin, 10);
+}
+
+void
+JS_BasicStatsAccum(JSBasicStats *bs, uint32 val)
+{
+    uintN oldscale, newscale, bin;
+    double mean;
+
+    ++bs->num;
+    if (bs->max < val)
+        bs->max = val;
+    bs->sum += val;
+    bs->sqsum += (double)val * val;
+
+    oldscale = bs->logscale;
+    if (oldscale != 10) {
+        mean = bs->sum / bs->num;
+        if (bs->max > 16 && mean > 8) {
+            newscale = (bs->max > 1e6 && mean > 1000) ? 10 : 2;
+            if (newscale != oldscale) {
+                uint32 newhist[11], newbin;
+
+                memset(newhist, 0, sizeof newhist);
+                for (bin = 0; bin <= 10; bin++) {
+                    newbin = ValToBin(newscale, BinToVal(oldscale, bin));
+                    newhist[newbin] += bs->hist[bin];
+                }
+                memcpy(bs->hist, newhist, sizeof bs->hist);
+                bs->logscale = newscale;
+            }
+        }
+    }
+
+    bin = ValToBin(bs->logscale, val);
+    ++bs->hist[bin];
+}
+
+double
+JS_MeanAndStdDev(uint32 num, double sum, double sqsum, double *sigma)
+{
+    double var;
+
+    if (num == 0 || sum == 0) {
+        *sigma = 0;
+        return 0;
+    }
+
+    var = num * sqsum - sum * sum;
+    if (var < 0 || num == 1)
+        var = 0;
+    else
+        var /= (double)num * (num - 1);
+
+    /* Windows says sqrt(0.0) is "-1.#J" (?!) so we must test. */
+    *sigma = (var != 0) ? sqrt(var) : 0;
+    return sum / num;
+}
+
+void
+JS_DumpBasicStats(JSBasicStats *bs, const char *title, FILE *fp)
+{
+    double mean, sigma;
+
+    mean = JS_MeanAndStdDevBS(bs, &sigma);
+    fprintf(fp, "\nmean %s %g, std. deviation %g, max %lu\n",
+            title, mean, sigma, (unsigned long) bs->max);
+    JS_DumpHistogram(bs, fp);
+}
+
+void
+JS_DumpHistogram(JSBasicStats *bs, FILE *fp)
+{
+    uintN bin;
+    uint32 cnt, max, prev, val, i;
+    double sum, mean;
+
+    for (bin = 0, max = 0, sum = 0; bin <= 10; bin++) {
+        cnt = bs->hist[bin];
+        if (max < cnt)
+            max = cnt;
+        sum += cnt;
+    }
+    mean = sum / cnt;
+    for (bin = 0, prev = 0; bin <= 10; bin++, prev = val) {
+        val = BinToVal(bs->logscale, bin);
+        cnt = bs->hist[bin];
+        if (prev + 1 >= val)
+            fprintf(fp, "        [%6u]", val);
+        else
+            fprintf(fp, "[%6u, %6u]", prev + 1, val);
+        fprintf(fp, "%s %8u ", (bin == 10) ? "+" : ":", cnt);
+        if (cnt != 0) {
+            if (max > 1e6 && mean > 1e3)
+                cnt = (uint32) ceil(log10((double) cnt));
+            else if (max > 16 && mean > 8)
+                cnt = JS_CeilingLog2(cnt);
+            for (i = 0; i < cnt; i++)
+                putc('*', fp);
+        }
+        putc('\n', fp);
+    }
+}
+
+#endif /* JS_BASIC_STATS */
+
+#if defined DEBUG_notme && defined XP_UNIX
+
+#define __USE_GNU 1
+#include <dlfcn.h>
+#include <string.h>
+#include "jshash.h"
+#include "jsprf.h"
+
+JSCallsite js_calltree_root = {0, NULL, NULL, 0, NULL, NULL, NULL, NULL};
+
+static JSCallsite *
+CallTree(void **bp)
+{
+    void **bpup, **bpdown, *pc;
+    JSCallsite *parent, *site, **csp;
+    Dl_info info;
+    int ok, offset;
+    const char *symbol;
+    char *method;
+
+    /* Reverse the stack frame list to avoid recursion. */
+    bpup = NULL;
+    for (;;) {
+        bpdown = (void**) bp[0];
+        bp[0] = (void*) bpup;
+        if ((void**) bpdown[0] < bpdown)
+            break;
+        bpup = bp;
+        bp = bpdown;
+    }
+
+    /* Reverse the stack again, finding and building a path in the tree. */
+    parent = &js_calltree_root;
+    do {
+        bpup = (void**) bp[0];
+        bp[0] = (void*) bpdown;
+        pc = bp[1];
+
+        csp = &parent->kids;
+        while ((site = *csp) != NULL) {
+            if (site->pc == (uint32)pc) {
+                /* Put the most recently used site at the front of siblings. */
+                *csp = site->siblings;
+                site->siblings = parent->kids;
+                parent->kids = site;
+
+                /* Site already built -- go up the stack. */
+                goto upward;
+            }
+            csp = &site->siblings;
+        }
+
+        /* Check for recursion: see if pc is on our ancestor line. */
+        for (site = parent; site; site = site->parent) {
+            if (site->pc == (uint32)pc)
+                goto upward;
+        }
+
+        /*
+         * Not in tree at all: let's find our symbolic callsite info.
+         * XXX static syms are masked by nearest lower global
+         */
+        info.dli_fname = info.dli_sname = NULL;
+        ok = dladdr(pc, &info);
+        if (ok < 0) {
+            fprintf(stderr, "dladdr failed!\n");
+            return NULL;
+        }
+
+/* XXXbe sub 0x08040000? or something, see dbaron bug with tenthumbs comment */
+        symbol = info.dli_sname;
+        offset = (char*)pc - (char*)info.dli_fbase;
+        method = symbol
+                 ? strdup(symbol)
+                 : JS_smprintf("%s+%X",
+                               info.dli_fname ? info.dli_fname : "main",
+                               offset);
+        if (!method)
+            return NULL;
+
+        /* Create a new callsite record. */
+        site = (JSCallsite *) malloc(sizeof(JSCallsite));
+        if (!site)
+            return NULL;
+
+        /* Insert the new site into the tree. */
+        site->pc = (uint32)pc;
+        site->name = method;
+        site->library = info.dli_fname;
+        site->offset = offset;
+        site->parent = parent;
+        site->siblings = parent->kids;
+        parent->kids = site;
+        site->kids = NULL;
+
+      upward:
+        parent = site;
+        bpdown = bp;
+        bp = bpup;
+    } while (bp);
+
+    return site;
+}
+
+JSCallsite *
+JS_Backtrace(int skip)
+{
+    void **bp, **bpdown;
+
+    /* Stack walking code adapted from Kipp's "leaky". */
+#if defined(__i386)
+    __asm__( "movl %%ebp, %0" : "=g"(bp));
+#elif defined(__x86_64__)
+    __asm__( "movq %%rbp, %0" : "=g"(bp));
+#else
+    /*
+     * It would be nice if this worked uniformly, but at least on i386 and
+     * x86_64, it stopped working with gcc 4.1, because it points to the
+     * end of the saved registers instead of the start.
+     */
+    bp = (void**) __builtin_frame_address(0);
+#endif
+    while (--skip >= 0) {
+        bpdown = (void**) *bp++;
+        if (bpdown < bp)
+            break;
+        bp = bpdown;
+    }
+
+    return CallTree(bp);
+}
+
+#endif /* DEBUG_notme && XP_UNIX */