本文整理汇总了C++中HandleValue::isNull方法的典型用法代码示例。如果您正苦于以下问题：C++ HandleValue::isNull方法的具体用法？C++ HandleValue::isNull怎么用？C++ HandleValue::isNull使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类HandleValue的用法示例。
在下文中一共展示了HandleValue::isNull方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: esg
bool
js::DirectEvalStringFromIon(JSContext *cx,
HandleObject scopeobj, HandleScript callerScript,
HandleValue thisValue, HandleString str,
jsbytecode *pc, MutableHandleValue vp)
{
AssertInnerizedScopeChain(cx, *scopeobj);
Rooted<GlobalObject*> scopeObjGlobal(cx, &scopeobj->global());
if (!GlobalObject::isRuntimeCodeGenEnabled(cx, scopeObjGlobal)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CSP_BLOCKED_EVAL);
return false;
}
// ES5 15.1.2.1 steps 2-8.
unsigned staticLevel = callerScript->staticLevel() + 1;
Rooted<JSFlatString*> flatStr(cx, str->ensureFlat(cx));
if (!flatStr)
return false;
EvalJSONResult ejr = TryEvalJSON(cx, callerScript, flatStr, vp);
if (ejr != EvalJSON_NotJSON)
return ejr == EvalJSON_Success;
EvalScriptGuard esg(cx);
esg.lookupInEvalCache(flatStr, callerScript, pc);
if (!esg.foundScript()) {
RootedScript maybeScript(cx);
const char *filename;
unsigned lineno;
JSPrincipals *originPrincipals;
uint32_t pcOffset;
DescribeScriptedCallerForCompilation(cx, &maybeScript, &filename, &lineno, &pcOffset,
&originPrincipals, CALLED_FROM_JSOP_EVAL);
const char *introducerFilename = filename;
if (maybeScript && maybeScript->scriptSource()->introducerFilename())
introducerFilename = maybeScript->scriptSource()->introducerFilename();
CompileOptions options(cx);
options.setFileAndLine(filename, 1)
.setCompileAndGo(true)
.setForEval(true)
.setNoScriptRval(false)
.setOriginPrincipals(originPrincipals)
.setIntroductionInfo(introducerFilename, "eval", lineno, maybeScript, pcOffset);
AutoStableStringChars flatChars(cx);
if (!flatChars.initTwoByte(cx, flatStr))
return false;
const char16_t *chars = flatChars.twoByteRange().start().get();
SourceBufferHolder::Ownership ownership = flatChars.maybeGiveOwnershipToCaller()
? SourceBufferHolder::GiveOwnership
: SourceBufferHolder::NoOwnership;
SourceBufferHolder srcBuf(chars, flatStr->length(), ownership);
JSScript *compiled = frontend::CompileScript(cx, &cx->tempLifoAlloc(),
scopeobj, callerScript, options,
srcBuf, flatStr, staticLevel);
if (!compiled)
return false;
esg.setNewScript(compiled);
}
// Primitive 'this' values should have been filtered out by Ion. If boxed,
// the calling frame cannot be updated to store the new object.
JS_ASSERT(thisValue.isObject() || thisValue.isUndefined() || thisValue.isNull());
return ExecuteKernel(cx, esg.script(), *scopeobj, thisValue, ExecuteType(DIRECT_EVAL),
NullFramePtr() /* evalInFrame */, vp.address());
}示例2: linearStr
bool
js::DirectEvalStringFromIon(JSContext* cx,
HandleObject scopeobj, HandleScript callerScript,
HandleValue thisValue, HandleValue newTargetValue,
HandleString str, jsbytecode* pc, MutableHandleValue vp)
{
AssertInnerizedScopeChain(cx, *scopeobj);
Rooted<GlobalObject*> scopeObjGlobal(cx, &scopeobj->global());
if (!GlobalObject::isRuntimeCodeGenEnabled(cx, scopeObjGlobal)) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CSP_BLOCKED_EVAL);
return false;
}
// ES5 15.1.2.1 steps 2-8.
unsigned staticLevel = callerScript->staticLevel() + 1;
RootedLinearString linearStr(cx, str->ensureLinear(cx));
if (!linearStr)
return false;
EvalJSONResult ejr = TryEvalJSON(cx, linearStr, vp);
if (ejr != EvalJSON_NotJSON)
return ejr == EvalJSON_Success;
EvalScriptGuard esg(cx);
esg.lookupInEvalCache(linearStr, callerScript, pc);
if (!esg.foundScript()) {
RootedScript maybeScript(cx);
const char* filename;
unsigned lineno;
bool mutedErrors;
uint32_t pcOffset;
DescribeScriptedCallerForCompilation(cx, &maybeScript, &filename, &lineno, &pcOffset,
&mutedErrors, CALLED_FROM_JSOP_EVAL);
const char* introducerFilename = filename;
if (maybeScript && maybeScript->scriptSource()->introducerFilename())
introducerFilename = maybeScript->scriptSource()->introducerFilename();
RootedObject enclosing(cx, callerScript->innermostStaticScope(pc));
Rooted<StaticEvalObject*> staticScope(cx, StaticEvalObject::create(cx, enclosing));
if (!staticScope)
return false;
CompileOptions options(cx);
options.setFileAndLine(filename, 1)
.setIsRunOnce(true)
.setForEval(true)
.setNoScriptRval(false)
.setMutedErrors(mutedErrors)
.setIntroductionInfo(introducerFilename, "eval", lineno, maybeScript, pcOffset)
.maybeMakeStrictMode(IsStrictEvalPC(pc));
AutoStableStringChars linearChars(cx);
if (!linearChars.initTwoByte(cx, linearStr))
return false;
const char16_t* chars = linearChars.twoByteRange().start().get();
SourceBufferHolder::Ownership ownership = linearChars.maybeGiveOwnershipToCaller()
? SourceBufferHolder::GiveOwnership
: SourceBufferHolder::NoOwnership;
SourceBufferHolder srcBuf(chars, linearStr->length(), ownership);
JSScript* compiled = frontend::CompileScript(cx, &cx->tempLifoAlloc(),
scopeobj, staticScope, callerScript,
options, srcBuf, linearStr, staticLevel);
if (!compiled)
return false;
if (compiled->strict())
staticScope->setStrict();
esg.setNewScript(compiled);
}
// Primitive 'this' values should have been filtered out by Ion. If boxed,
// the calling frame cannot be updated to store the new object.
MOZ_ASSERT(thisValue.isObject() || thisValue.isUndefined() || thisValue.isNull());
// When eval'ing strict code in a non-strict context, compute the 'this'
// value to use from what the caller passed in. This isn't necessary if
// the callee is not strict, as it will compute the non-strict 'this'
// value as necessary while it executes.
RootedValue nthisValue(cx, thisValue);
if (!callerScript->strict() && esg.script()->strict() && !thisValue.isObject()) {
JSObject* obj = BoxNonStrictThis(cx, thisValue);
if (!obj)
return false;
nthisValue = ObjectValue(*obj);
}
return ExecuteKernel(cx, esg.script(), *scopeobj, nthisValue, newTargetValue,
ExecuteType(DIRECT_EVAL), NullFramePtr() /* evalInFrame */, vp.address());
}示例3: esg
bool
js::DirectEvalFromIon(JSContext *cx,
HandleObject scopeobj, HandleScript callerScript,
HandleValue thisValue, HandleString str,
MutableHandleValue vp)
{
AssertInnerizedScopeChain(cx, *scopeobj);
Rooted<GlobalObject*> scopeObjGlobal(cx, &scopeobj->global());
if (!GlobalObject::isRuntimeCodeGenEnabled(cx, scopeObjGlobal)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CSP_BLOCKED_EVAL);
return false;
}
// ES5 15.1.2.1 steps 2-8.
unsigned staticLevel = callerScript->staticLevel + 1;
Rooted<JSStableString*> stableStr(cx, str->ensureStable(cx));
if (!stableStr)
return false;
StableCharPtr chars = stableStr->chars();
size_t length = stableStr->length();
EvalJSONResult ejr = TryEvalJSON(cx, callerScript, chars, length, vp);
if (ejr != EvalJSON_NotJSON)
return ejr == EvalJSON_Success;
EvalScriptGuard esg(cx);
// Ion will not perform cross compartment direct eval calls.
JSPrincipals *principals = cx->compartment->principals;
esg.lookupInEvalCache(stableStr, callerScript->function(), staticLevel);
if (!esg.foundScript()) {
unsigned lineno;
const char *filename;
JSPrincipals *originPrincipals;
CurrentScriptFileLineOrigin(cx, &filename, &lineno, &originPrincipals,
CALLED_FROM_JSOP_EVAL);
CompileOptions options(cx);
options.setFileAndLine(filename, lineno)
.setCompileAndGo(true)
.setNoScriptRval(false)
.setPrincipals(principals)
.setOriginPrincipals(originPrincipals);
UnrootedScript compiled = frontend::CompileScript(cx, scopeobj, callerScript, options,
chars.get(), length, stableStr, staticLevel);
if (!compiled)
return false;
esg.setNewScript(compiled);
}
// Primitive 'this' values should have been filtered out by Ion. If boxed,
// the calling frame cannot be updated to store the new object.
JS_ASSERT(thisValue.isObject() || thisValue.isUndefined() || thisValue.isNull());
return ExecuteKernel(cx, esg.script(), *scopeobj, thisValue, ExecuteType(DIRECT_EVAL),
NullFramePtr() /* evalInFrame */, vp.address());
}示例4: chars
bool
js::DirectEvalStringFromIon(JSContext *cx,
HandleObject scopeobj, HandleScript callerScript,
HandleValue thisValue, HandleString str,
jsbytecode *pc, MutableHandleValue vp)
{
AssertInnerizedScopeChain(cx, *scopeobj);
Rooted<GlobalObject*> scopeObjGlobal(cx, &scopeobj->global());
if (!GlobalObject::isRuntimeCodeGenEnabled(cx, scopeObjGlobal)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CSP_BLOCKED_EVAL);
return false;
}
// ES5 15.1.2.1 steps 2-8.
unsigned staticLevel = callerScript->staticLevel() + 1;
Rooted<JSFlatString*> flatStr(cx, str->ensureFlat(cx));
if (!flatStr)
return false;
size_t length = flatStr->length();
ConstTwoByteChars chars(flatStr->chars(), length);
EvalJSONResult ejr = TryEvalJSON(cx, callerScript, chars, length, vp);
if (ejr != EvalJSON_NotJSON)
return ejr == EvalJSON_Success;
EvalScriptGuard esg(cx);
// Ion will not perform cross compartment direct eval calls.
JSPrincipals *principals = cx->compartment()->principals;
esg.lookupInEvalCache(flatStr, callerScript, pc);
if (!esg.foundScript()) {
JSScript *script;
const char *filename;
unsigned lineno;
JSPrincipals *originPrincipals;
uint32_t pcOffset;
CurrentScriptFileLineOrigin(cx, &script, &filename, &lineno, &pcOffset,
&originPrincipals, CALLED_FROM_JSOP_EVAL);
const char *introducerFilename = filename;
if (script && script->scriptSource()->introducerFilename())
introducerFilename = script->scriptSource()->introducerFilename();
CompileOptions options(cx);
options.setFileAndLine(filename, 1)
.setCompileAndGo(true)
.setForEval(true)
.setNoScriptRval(false)
.setPrincipals(principals)
.setOriginPrincipals(originPrincipals)
.setIntroductionInfo(introducerFilename, "eval", lineno, script, pcOffset);
JSScript *compiled = frontend::CompileScript(cx, &cx->tempLifoAlloc(),
scopeobj, callerScript, options,
chars.get(), length, flatStr, staticLevel);
if (!compiled)
return false;
MarkFunctionsWithinEvalScript(compiled);
esg.setNewScript(compiled);
}
// Primitive 'this' values should have been filtered out by Ion. If boxed,
// the calling frame cannot be updated to store the new object.
JS_ASSERT(thisValue.isObject() || thisValue.isUndefined() || thisValue.isNull());
return ExecuteKernel(cx, esg.script(), *scopeobj, thisValue, ExecuteType(DIRECT_EVAL),
NullFramePtr() /* evalInFrame */, vp.address());
}