The Tor Browser / file comparison
comparison: js/xpconnect/src/XPCThrower.cpp
js/xpconnect/src/XPCThrower.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:ce4ff9c2f8da |
|---|---|
| 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 /* Code for throwing errors into JavaScript. */ | |
| 8 | |
| 9 #include "xpcprivate.h" | |
| 10 #include "XPCWrapper.h" | |
| 11 #include "jsprf.h" | |
| 12 #include "mozilla/dom/BindingUtils.h" | |
| 13 #include "mozilla/dom/Exceptions.h" | |
| 14 | |
| 15 using namespace mozilla; | |
| 16 using namespace mozilla::dom; | |
| 17 | |
| 18 bool XPCThrower::sVerbose = true; | |
| 19 | |
| 20 // static | |
| 21 void | |
| 22 XPCThrower::Throw(nsresult rv, JSContext* cx) | |
| 23 { | |
| 24 const char* format; | |
| 25 if (JS_IsExceptionPending(cx)) | |
| 26 return; | |
| 27 if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format)) | |
| 28 format = ""; | |
| 29 dom::Throw(cx, rv, format); | |
| 30 } | |
| 31 | |
| 32 namespace xpc { | |
| 33 | |
| 34 bool | |
| 35 Throw(JSContext *cx, nsresult rv) | |
| 36 { | |
| 37 XPCThrower::Throw(rv, cx); | |
| 38 return false; | |
| 39 } | |
| 40 | |
| 41 } // namespace xpc | |
| 42 | |
| 43 /* | |
| 44 * If there has already been an exception thrown, see if we're throwing the | |
| 45 * same sort of exception, and if we are, don't clobber the old one. ccx | |
| 46 * should be the current call context. | |
| 47 */ | |
| 48 // static | |
| 49 bool | |
| 50 XPCThrower::CheckForPendingException(nsresult result, JSContext *cx) | |
| 51 { | |
| 52 nsCOMPtr<nsIException> e = XPCJSRuntime::Get()->GetPendingException(); | |
| 53 if (!e) | |
| 54 return false; | |
| 55 XPCJSRuntime::Get()->SetPendingException(nullptr); | |
| 56 | |
| 57 nsresult e_result; | |
| 58 if (NS_FAILED(e->GetResult(&e_result)) || e_result != result) | |
| 59 return false; | |
| 60 | |
| 61 if (!ThrowExceptionObject(cx, e)) | |
| 62 JS_ReportOutOfMemory(cx); | |
| 63 return true; | |
| 64 } | |
| 65 | |
| 66 // static | |
| 67 void | |
| 68 XPCThrower::Throw(nsresult rv, XPCCallContext& ccx) | |
| 69 { | |
| 70 char* sz; | |
| 71 const char* format; | |
| 72 | |
| 73 if (CheckForPendingException(rv, ccx)) | |
| 74 return; | |
| 75 | |
| 76 if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format)) | |
| 77 format = ""; | |
| 78 | |
| 79 sz = (char*) format; | |
| 80 | |
| 81 if (sz && sVerbose) | |
| 82 Verbosify(ccx, &sz, false); | |
| 83 | |
| 84 dom::Throw(ccx, rv, sz); | |
| 85 | |
| 86 if (sz && sz != format) | |
| 87 JS_smprintf_free(sz); | |
| 88 } | |
| 89 | |
| 90 | |
| 91 // static | |
| 92 void | |
| 93 XPCThrower::ThrowBadResult(nsresult rv, nsresult result, XPCCallContext& ccx) | |
| 94 { | |
| 95 char* sz; | |
| 96 const char* format; | |
| 97 const char* name; | |
| 98 | |
| 99 /* | |
| 100 * If there is a pending exception when the native call returns and | |
| 101 * it has the same error result as returned by the native call, then | |
| 102 * the native call may be passing through an error from a previous JS | |
| 103 * call. So we'll just throw that exception into our JS. | |
| 104 */ | |
| 105 | |
| 106 if (CheckForPendingException(result, ccx)) | |
| 107 return; | |
| 108 | |
| 109 // else... | |
| 110 | |
| 111 if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format) || !format) | |
| 112 format = ""; | |
| 113 | |
| 114 if (nsXPCException::NameAndFormatForNSResult(result, &name, nullptr) && name) | |
| 115 sz = JS_smprintf("%s 0x%x (%s)", format, result, name); | |
| 116 else | |
| 117 sz = JS_smprintf("%s 0x%x", format, result); | |
| 118 | |
| 119 if (sz && sVerbose) | |
| 120 Verbosify(ccx, &sz, true); | |
| 121 | |
| 122 dom::Throw(ccx, result, sz); | |
| 123 | |
| 124 if (sz) | |
| 125 JS_smprintf_free(sz); | |
| 126 } | |
| 127 | |
| 128 // static | |
| 129 void | |
| 130 XPCThrower::ThrowBadParam(nsresult rv, unsigned paramNum, XPCCallContext& ccx) | |
| 131 { | |
| 132 char* sz; | |
| 133 const char* format; | |
| 134 | |
| 135 if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format)) | |
| 136 format = ""; | |
| 137 | |
| 138 sz = JS_smprintf("%s arg %d", format, paramNum); | |
| 139 | |
| 140 if (sz && sVerbose) | |
| 141 Verbosify(ccx, &sz, true); | |
| 142 | |
| 143 dom::Throw(ccx, rv, sz); | |
| 144 | |
| 145 if (sz) | |
| 146 JS_smprintf_free(sz); | |
| 147 } | |
| 148 | |
| 149 | |
| 150 // static | |
| 151 void | |
| 152 XPCThrower::Verbosify(XPCCallContext& ccx, | |
| 153 char** psz, bool own) | |
| 154 { | |
| 155 char* sz = nullptr; | |
| 156 | |
| 157 if (ccx.HasInterfaceAndMember()) { | |
| 158 XPCNativeInterface* iface = ccx.GetInterface(); | |
| 159 jsid id = ccx.GetMember()->GetName(); | |
| 160 JSAutoByteString bytes; | |
| 161 const char *name = JSID_IS_VOID(id) ? "Unknown" : bytes.encodeLatin1(ccx, JSID_TO_STRING(id)); | |
| 162 if (!name) { | |
| 163 name = ""; | |
| 164 } | |
| 165 sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name); | |
| 166 } | |
| 167 | |
| 168 if (sz) { | |
| 169 if (own) | |
| 170 JS_smprintf_free(*psz); | |
| 171 *psz = sz; | |
| 172 } | |
| 173 } |
