inspector/JSJavaScriptCallFrame.cpp

   1 /*
   2  * Copyright (C) 2014 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSJavaScriptCallFrame.h"
  28
  29 #if ENABLE(INSPECTOR)
  30
  31 #include "Error.h"
  32 #include "JSCJSValue.h"
  33 #include "JSCellInlines.h"
  34 #include "JSJavaScriptCallFramePrototype.h"
  35 #include "StructureInlines.h"
  36
  37 using namespace JSC;
  38
  39 namespace Inspector {
  40
  41 const ClassInfo JSJavaScriptCallFrame::s_info = { "JavaScriptCallFrame", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSJavaScriptCallFrame) };
  42
  43 JSJavaScriptCallFrame::JSJavaScriptCallFrame(VM& vm, Structure* structure, PassRefPtr<JavaScriptCallFrame> impl)
  44     : JSDestructibleObject(vm, structure)
  45     , m_impl(impl.leakRef())
  46 {
  47 }
  48
  49 void JSJavaScriptCallFrame::finishCreation(VM& vm)
  50 {
  51     Base::finishCreation(vm);
  52     ASSERT(inherits(info()));
  53 }
  54
  55 JSObject* JSJavaScriptCallFrame::createPrototype(VM& vm, JSGlobalObject* globalObject)
  56 {
  57     return JSJavaScriptCallFramePrototype::create(vm, globalObject, JSJavaScriptCallFramePrototype::createStructure(vm, globalObject, globalObject->objectPrototype()));
  58 }
  59
  60 void JSJavaScriptCallFrame::destroy(JSC::JSCell* cell)
  61 {
  62     JSJavaScriptCallFrame* thisObject = static_cast<JSJavaScriptCallFrame*>(cell);
  63     thisObject->JSJavaScriptCallFrame::~JSJavaScriptCallFrame();
  64 }
  65
  66 void JSJavaScriptCallFrame::releaseImpl()
  67 {
  68     if (m_impl) {
  69         m_impl->deref();
  70         m_impl = nullptr;
  71     }
  72 }
  73
  74 JSJavaScriptCallFrame::~JSJavaScriptCallFrame()
  75 {
  76     releaseImpl();
  77 }
  78
  79 JSValue JSJavaScriptCallFrame::evaluate(ExecState* exec)
  80 {
  81     JSValue exception;
  82     JSValue result = impl().evaluate(exec->argument(0).toString(exec)->value(exec), exception);
  83     if (exception)
  84         exec->vm().throwException(exec, exception);
  85
  86     return result;
  87 }
  88
  89 JSValue JSJavaScriptCallFrame::scopeType(ExecState* exec)
  90 {
  91     if (!impl().scopeChain())
  92         return jsUndefined();
  93
  94     if (!exec->argument(0).isInt32())
  95         return jsUndefined();
  96     int index = exec->argument(0).asInt32();
  97
  98     JSScope* scopeChain = impl().scopeChain();
  99     ScopeChainIterator end = scopeChain->end();
 100
 101     // FIXME: We should be identifying and returning CATCH_SCOPE appropriately.
 102
 103     bool foundLocalScope = false;
 104     for (ScopeChainIterator iter = scopeChain->begin(); iter != end; ++iter) {
 105         JSObject* scope = iter.get();
 106         if (scope->isActivationObject()) {
 107             if (!foundLocalScope) {
 108                 // First activation object is local scope, each successive activation object is closure.
 109                 if (!index)
 110                     return jsNumber(JSJavaScriptCallFrame::LOCAL_SCOPE);
 111                 foundLocalScope = true;
 112             } else if (!index)
 113                 return jsNumber(JSJavaScriptCallFrame::CLOSURE_SCOPE);
 114         }
 115
 116         if (!index) {
 117             // Last in the chain is global scope.
 118             if (++iter == end)
 119                 return jsNumber(JSJavaScriptCallFrame::GLOBAL_SCOPE);
 120             return jsNumber(JSJavaScriptCallFrame::WITH_SCOPE);
 121         }
 122
 123         --index;
 124     }
 125
 126     ASSERT_NOT_REACHED();
 127     return jsUndefined();
 128 }
 129
 130 JSValue JSJavaScriptCallFrame::caller(ExecState* exec) const
 131 {
 132     return toJS(exec, globalObject(), impl().caller());
 133 }
 134
 135 JSValue JSJavaScriptCallFrame::sourceID(ExecState*) const
 136 {
 137     return jsNumber(impl().sourceID());
 138 }
 139
 140 JSValue JSJavaScriptCallFrame::line(ExecState*) const
 141 {
 142     return jsNumber(impl().line());
 143 }
 144
 145 JSValue JSJavaScriptCallFrame::column(ExecState*) const
 146 {
 147     return jsNumber(impl().column());
 148 }
 149
 150 JSValue JSJavaScriptCallFrame::functionName(ExecState* exec) const
 151 {
 152     return jsString(exec, impl().functionName());
 153 }
 154
 155 JSValue JSJavaScriptCallFrame::scopeChain(ExecState* exec) const
 156 {
 157     if (!impl().scopeChain())
 158         return jsNull();
 159
 160     JSScope* scopeChain = impl().scopeChain();
 161     ScopeChainIterator iter = scopeChain->begin();
 162     ScopeChainIterator end = scopeChain->end();
 163
 164     // We must always have something in the scope chain.
 165     ASSERT(iter != end);
 166
 167     MarkedArgumentBuffer list;
 168     do {
 169         list.append(iter.get());
 170         ++iter;
 171     } while (iter != end);
 172
 173     return constructArray(exec, nullptr, globalObject(), list);
 174 }
 175
 176 JSValue JSJavaScriptCallFrame::thisObject(ExecState*) const
 177 {
 178     return impl().thisValue();
 179 }
 180
 181 JSValue JSJavaScriptCallFrame::type(ExecState* exec) const
 182 {
 183     switch (impl().type()) {
 184     case DebuggerCallFrame::FunctionType:
 185         return jsNontrivialString(exec, ASCIILiteral("function"));
 186     case DebuggerCallFrame::ProgramType:
 187         return jsNontrivialString(exec, ASCIILiteral("program"));
 188     }
 189
 190     ASSERT_NOT_REACHED();
 191     return jsNull();
 192 }
 193
 194 JSValue toJS(ExecState* exec, JSGlobalObject* globalObject, JavaScriptCallFrame* impl)
 195 {
 196     if (!impl)
 197         return jsNull();
 198
 199     JSObject* prototype = JSJavaScriptCallFrame::createPrototype(exec->vm(), globalObject);
 200     Structure* structure = JSJavaScriptCallFrame::createStructure(exec->vm(), globalObject, prototype);
 201     JSJavaScriptCallFrame* javaScriptCallFrame = JSJavaScriptCallFrame::create(exec->vm(), structure, impl);
 202
 203     return javaScriptCallFrame;
 204 }
 205
 206 JSJavaScriptCallFrame* toJSJavaScriptCallFrame(JSValue value)
 207 {
 208     return value.inherits(JSJavaScriptCallFrame::info()) ? jsCast<JSJavaScriptCallFrame*>(value) : nullptr;
 209 }
 210
 211 } // namespace Inspector
 212
 213 #endif // ENABLE(INSPECTOR)