The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/xpconnect/src/XPCDebug.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,134 @@
     1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
     1.5 +/* vim: set ts=8 sts=4 et sw=4 tw=99: */
     1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.9 +
    1.10 +#include "xpcprivate.h"
    1.11 +#include "jsprf.h"
    1.12 +#include "js/OldDebugAPI.h"
    1.13 +
    1.14 +#ifdef XP_WIN
    1.15 +#include <windows.h>
    1.16 +#endif
    1.17 +
    1.18 +static void DebugDump(const char* fmt, ...)
    1.19 +{
    1.20 +  char buffer[2048];
    1.21 +  va_list ap;
    1.22 +  va_start(ap, fmt);
    1.23 +#ifdef XPWIN
    1.24 +  _vsnprintf(buffer, sizeof(buffer), fmt, ap);
    1.25 +#else
    1.26 +  vsnprintf(buffer, sizeof(buffer), fmt, ap);
    1.27 +#endif
    1.28 +  buffer[sizeof(buffer)-1] = '\0';
    1.29 +  va_end(ap);
    1.30 +#ifdef XP_WIN
    1.31 +  if (IsDebuggerPresent()) {
    1.32 +    OutputDebugStringA(buffer);
    1.33 +  }
    1.34 +#endif
    1.35 +  printf("%s", buffer);
    1.36 +}
    1.37 +
    1.38 +bool
    1.39 +xpc_DumpJSStack(JSContext* cx, bool showArgs, bool showLocals, bool showThisProps)
    1.40 +{
    1.41 +    if (char* buf = xpc_PrintJSStack(cx, showArgs, showLocals, showThisProps)) {
    1.42 +        DebugDump("%s\n", buf);
    1.43 +        JS_smprintf_free(buf);
    1.44 +    }
    1.45 +    return true;
    1.46 +}
    1.47 +
    1.48 +char*
    1.49 +xpc_PrintJSStack(JSContext* cx, bool showArgs, bool showLocals,
    1.50 +                 bool showThisProps)
    1.51 +{
    1.52 +    JS::AutoSaveExceptionState state(cx);
    1.53 +
    1.54 +    char *buf = JS::FormatStackDump(cx, nullptr, showArgs, showLocals, showThisProps);
    1.55 +    if (!buf)
    1.56 +        DebugDump("%s", "Failed to format JavaScript stack for dump\n");
    1.57 +
    1.58 +    state.restore();
    1.59 +    return buf;
    1.60 +}
    1.61 +
    1.62 +/***************************************************************************/
    1.63 +
    1.64 +static void
    1.65 +xpcDumpEvalErrorReporter(JSContext *cx, const char *message,
    1.66 +                         JSErrorReport *report)
    1.67 +{
    1.68 +    DebugDump("Error: %s\n", message);
    1.69 +}
    1.70 +
    1.71 +bool
    1.72 +xpc_DumpEvalInJSStackFrame(JSContext* cx, uint32_t frameno, const char* text)
    1.73 +{
    1.74 +    if (!cx || !text) {
    1.75 +        DebugDump("%s", "invalid params passed to xpc_DumpEvalInJSStackFrame!\n");
    1.76 +        return false;
    1.77 +    }
    1.78 +
    1.79 +    DebugDump("js[%d]> %s\n", frameno, text);
    1.80 +
    1.81 +    uint32_t num = 0;
    1.82 +
    1.83 +    JSAbstractFramePtr frame = JSNullFramePtr();
    1.84 +
    1.85 +    JSBrokenFrameIterator iter(cx);
    1.86 +    while (!iter.done()) {
    1.87 +        if (num == frameno) {
    1.88 +            frame = iter.abstractFramePtr();
    1.89 +            break;
    1.90 +        }
    1.91 +        ++iter;
    1.92 +        num++;
    1.93 +    }
    1.94 +
    1.95 +    if (!frame) {
    1.96 +        DebugDump("%s", "invalid frame number!\n");
    1.97 +        return false;
    1.98 +    }
    1.99 +
   1.100 +    JS::AutoSaveExceptionState exceptionState(cx);
   1.101 +    JSErrorReporter older = JS_SetErrorReporter(cx, xpcDumpEvalErrorReporter);
   1.102 +
   1.103 +    JS::RootedValue rval(cx);
   1.104 +    JSString* str;
   1.105 +    JSAutoByteString bytes;
   1.106 +    if (frame.evaluateInStackFrame(cx, text, strlen(text), "eval", 1, &rval) &&
   1.107 +        nullptr != (str = ToString(cx, rval)) &&
   1.108 +        bytes.encodeLatin1(cx, str)) {
   1.109 +        DebugDump("%s\n", bytes.ptr());
   1.110 +    } else {
   1.111 +        DebugDump("%s", "eval failed!\n");
   1.112 +    }
   1.113 +
   1.114 +    JS_SetErrorReporter(cx, older);
   1.115 +    exceptionState.restore();
   1.116 +    return true;
   1.117 +}
   1.118 +
   1.119 +/***************************************************************************/
   1.120 +
   1.121 +JSTrapStatus
   1.122 +xpc_DebuggerKeywordHandler(JSContext *cx, JSScript *script, jsbytecode *pc,
   1.123 +                           jsval *rval, void *closure)
   1.124 +{
   1.125 +    static const char line[] =
   1.126 +    "------------------------------------------------------------------------\n";
   1.127 +    DebugDump("%s", line);
   1.128 +    DebugDump("%s", "Hit JavaScript \"debugger\" keyword. JS call stack...\n");
   1.129 +    xpc_DumpJSStack(cx, true, true, false);
   1.130 +    DebugDump("%s", line);
   1.131 +    return JSTRAP_CONTINUE;
   1.132 +}
   1.133 +
   1.134 +bool xpc_InstallJSDebuggerKeywordHandler(JSRuntime* rt)
   1.135 +{
   1.136 +    return JS_SetDebuggerHandler(rt, xpc_DebuggerKeywordHandler, nullptr);
   1.137 +}