LCOV - code coverage report
Current view: top level - js/src - jsexn.h (source / functions) Hit Total Coverage
Test: output.info Lines: 15 24 62.5 %
Date: 2017-07-14 16:53:18 Functions: 4 7 57.1 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2             :  * vim: set ts=8 sts=4 et sw=4 tw=99:
       3             :  * This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : /*
       8             :  * JS runtime exception classes.
       9             :  */
      10             : 
      11             : #ifndef jsexn_h
      12             : #define jsexn_h
      13             : 
      14             : #include "jsapi.h"
      15             : #include "jscntxt.h"
      16             : #include "NamespaceImports.h"
      17             : 
      18             : namespace js {
      19             : class ErrorObject;
      20             : 
      21             : JSErrorNotes::Note*
      22             : CopyErrorNote(JSContext* cx, JSErrorNotes::Note* note);
      23             : 
      24             : JSErrorReport*
      25             : CopyErrorReport(JSContext* cx, JSErrorReport* report);
      26             : 
      27             : JSString*
      28             : ComputeStackString(JSContext* cx);
      29             : 
      30             : /*
      31             :  * Given a JSErrorReport, check to see if there is an exception associated with
      32             :  * the error number.  If there is, then create an appropriate exception object,
      33             :  * set it as the pending exception, and set the JSREPORT_EXCEPTION flag on the
      34             :  * error report.
      35             :  *
      36             :  * It's possible we fail (due to OOM or some other error) and end up setting
      37             :  * cx->exception to a different exception. The original error described by
      38             :  * *reportp typically won't be reported anywhere in this case.
      39             :  *
      40             :  * If the error code is unrecognized, or if we decided to do nothing in order to
      41             :  * avoid recursion, we simply return and this error is just being swept under
      42             :  * the rug.
      43             :  */
      44             : extern void
      45             : ErrorToException(JSContext* cx, JSErrorReport* reportp,
      46             :                  JSErrorCallback callback, void* userRef);
      47             : 
      48             : extern JSErrorReport*
      49             : ErrorFromException(JSContext* cx, HandleObject obj);
      50             : 
      51             : /*
      52             :  * Make a copy of errobj parented to cx's compartment's global.
      53             :  *
      54             :  * errobj may be in a different compartment than cx, but it must be an Error
      55             :  * object (not a wrapper of one) and it must not be one of the standard error
      56             :  * prototype objects (errobj->getPrivate() must not be nullptr).
      57             :  */
      58             : extern JSObject*
      59             : CopyErrorObject(JSContext* cx, JS::Handle<ErrorObject*> errobj);
      60             : 
      61             : static_assert(JSEXN_ERR == 0 &&
      62             :               JSProto_Error + JSEXN_INTERNALERR == JSProto_InternalError &&
      63             :               JSProto_Error + JSEXN_EVALERR == JSProto_EvalError &&
      64             :               JSProto_Error + JSEXN_RANGEERR == JSProto_RangeError &&
      65             :               JSProto_Error + JSEXN_REFERENCEERR == JSProto_ReferenceError &&
      66             :               JSProto_Error + JSEXN_SYNTAXERR == JSProto_SyntaxError &&
      67             :               JSProto_Error + JSEXN_TYPEERR == JSProto_TypeError &&
      68             :               JSProto_Error + JSEXN_URIERR == JSProto_URIError &&
      69             :               JSProto_Error + JSEXN_DEBUGGEEWOULDRUN == JSProto_DebuggeeWouldRun &&
      70             :               JSProto_Error + JSEXN_WASMCOMPILEERROR == JSProto_CompileError &&
      71             :               JSProto_Error + JSEXN_WASMLINKERROR == JSProto_LinkError &&
      72             :               JSProto_Error + JSEXN_WASMRUNTIMEERROR == JSProto_RuntimeError &&
      73             :               JSEXN_WASMRUNTIMEERROR + 1 == JSEXN_WARN &&
      74             :               JSEXN_WARN + 1 == JSEXN_NOTE &&
      75             :               JSEXN_NOTE + 1 == JSEXN_LIMIT,
      76             :               "GetExceptionProtoKey and ExnTypeFromProtoKey require that "
      77             :               "each corresponding JSExnType and JSProtoKey value be separated "
      78             :               "by the same constant value");
      79             : 
      80             : static inline JSProtoKey
      81         108 : GetExceptionProtoKey(JSExnType exn)
      82             : {
      83         108 :     MOZ_ASSERT(JSEXN_ERR <= exn);
      84         108 :     MOZ_ASSERT(exn < JSEXN_WARN);
      85         108 :     return JSProtoKey(JSProto_Error + int(exn));
      86             : }
      87             : 
      88             : static inline JSExnType
      89         166 : ExnTypeFromProtoKey(JSProtoKey key)
      90             : {
      91         166 :     JSExnType type = static_cast<JSExnType>(key - JSProto_Error);
      92         166 :     MOZ_ASSERT(type >= JSEXN_ERR);
      93         166 :     MOZ_ASSERT(type < JSEXN_ERROR_LIMIT);
      94         166 :     return type;
      95             : }
      96             : 
      97             : static inline bool
      98           0 : IsErrorProtoKey(JSProtoKey key)
      99             : {
     100           0 :     JSExnType type = static_cast<JSExnType>(key - JSProto_Error);
     101           0 :     return type >= JSEXN_ERR && type < JSEXN_ERROR_LIMIT;
     102             : }
     103             : 
     104             : class AutoClearPendingException
     105             : {
     106             :     JSContext* cx;
     107             : 
     108             :   public:
     109           0 :     explicit AutoClearPendingException(JSContext* cxArg)
     110           0 :       : cx(cxArg)
     111           0 :     { }
     112             : 
     113           0 :     ~AutoClearPendingException() {
     114           0 :         JS_ClearPendingException(cx);
     115           0 :     }
     116             : };
     117             : 
     118             : class AutoAssertNoPendingException
     119             : {
     120             :     mozilla::DebugOnly<JSContext*> cx;
     121             : 
     122             :   public:
     123       14718 :     explicit AutoAssertNoPendingException(JSContext* cxArg)
     124       14718 :       : cx(cxArg)
     125       14718 :     { }
     126             : 
     127       29436 :     ~AutoAssertNoPendingException() {
     128       14718 :         MOZ_ASSERT(!JS_IsExceptionPending(cx));
     129       14718 :     }
     130             : };
     131             : 
     132             : extern const char*
     133             : ValueToSourceForError(JSContext* cx, HandleValue val, JSAutoByteString& bytes);
     134             : 
     135             : bool
     136             : GetInternalError(JSContext* cx, unsigned errorNumber, MutableHandleValue error);
     137             : bool
     138             : GetTypeError(JSContext* cx, unsigned errorNumber, MutableHandleValue error);
     139             : 
     140             : } // namespace js
     141             : 
     142             : #endif /* jsexn_h */

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