X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/14957cd040308e3eeec43d26bae5d76da13fcd85..93a3786624b2768d89bfa27e46598dc64e2fb70a:/API/JSContextRef.cpp

diff --git a/API/JSContextRef.cpp b/API/JSContextRef.cpp
index 9c15b22..3869e87 100644
--- a/API/JSContextRef.cpp
+++ b/API/JSContextRef.cpp
@@ -35,10 +35,11 @@
 #include "JSClassRef.h"
 #include "JSGlobalObject.h"
 #include "JSObject.h"
-#include "UStringBuilder.h"
+#include "Operations.h"
+#include "SourceProvider.h"
+#include <wtf/text/StringBuilder.h>
 #include <wtf/text/StringHash.h>
 
-
 #if OS(DARWIN)
 #include <mach-o/dyld.h>
 
@@ -47,10 +48,15 @@ static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500;
 
 using namespace JSC;
 
+// From the API's perspective, a context group remains alive iff
+//     (a) it has been JSContextGroupRetained
+//     OR
+//     (b) one of its contexts has been JSContextRetained
+
 JSContextGroupRef JSContextGroupCreate()
 {
     initializeThreading();
-    return toRef(JSGlobalData::createContextGroup(ThreadStackTypeSmall).leakRef());
+    return toRef(VM::createContextGroup().leakRef());
 }
 
 JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
@@ -61,22 +67,57 @@ JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
 
 void JSContextGroupRelease(JSContextGroupRef group)
 {
-    toJS(group)->deref();
+    IdentifierTable* savedIdentifierTable;
+    VM& vm = *toJS(group);
+
+    {
+        JSLockHolder lock(vm);
+        savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(vm.identifierTable);
+        vm.deref();
+    }
+
+    wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable);
 }
 
+static bool internalScriptTimeoutCallback(ExecState* exec, void* callbackPtr, void* callbackData)
+{
+    JSShouldTerminateCallback callback = reinterpret_cast<JSShouldTerminateCallback>(callbackPtr);
+    JSContextRef contextRef = toRef(exec);
+    ASSERT(callback);
+    return callback(contextRef, callbackData);
+}
+
+void JSContextGroupSetExecutionTimeLimit(JSContextGroupRef group, double limit, JSShouldTerminateCallback callback, void* callbackData)
+{
+    VM& vm = *toJS(group);
+    APIEntryShim entryShim(&vm);
+    Watchdog& watchdog = vm.watchdog;
+    if (callback) {
+        void* callbackPtr = reinterpret_cast<void*>(callback);
+        watchdog.setTimeLimit(vm, limit, internalScriptTimeoutCallback, callbackPtr, callbackData);
+    } else
+        watchdog.setTimeLimit(vm, limit);
+}
+
+void JSContextGroupClearExecutionTimeLimit(JSContextGroupRef group)
+{
+    VM& vm = *toJS(group);
+    APIEntryShim entryShim(&vm);
+    Watchdog& watchdog = vm.watchdog;
+    watchdog.setTimeLimit(vm, std::numeric_limits<double>::infinity());
+}
+
+// From the API's perspective, a global context remains alive iff it has been JSGlobalContextRetained.
+
 JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
 {
     initializeThreading();
+
 #if OS(DARWIN)
-    // When running on Tiger or Leopard, or if the application was linked before JSGlobalContextCreate was changed
-    // to use a unique JSGlobalData, we use a shared one for compatibility.
-#ifndef BUILDING_ON_LEOPARD
+    // If the application was linked before JSGlobalContextCreate was changed to use a unique VM,
+    // we use a shared one for backwards compatibility.
     if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
-#else
-    {
-#endif
-        JSLock lock(LockForReal);
-        return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
+        return JSGlobalContextCreateInGroup(toRef(&VM::sharedInstance()), globalObjectClass);
     }
 #endif // OS(DARWIN)
 
@@ -87,26 +128,22 @@ JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClass
 {
     initializeThreading();
 
-    JSLock lock(LockForReal);
-    RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createContextGroup(ThreadStackTypeSmall);
-
-    APIEntryShim entryShim(globalData.get(), false);
+    RefPtr<VM> vm = group ? PassRefPtr<VM>(toJS(group)) : VM::createContextGroup();
 
-#if ENABLE(JSC_MULTIPLE_THREADS)
-    globalData->makeUsableFromMultipleThreads();
-#endif
+    APIEntryShim entryShim(vm.get(), false);
+    vm->makeUsableFromMultipleThreads();
 
     if (!globalObjectClass) {
-        JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject(*globalData, JSGlobalObject::createStructure(*globalData, jsNull()));
+        JSGlobalObject* globalObject = JSGlobalObject::create(*vm, JSGlobalObject::createStructure(*vm, jsNull()));
         return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec()));
     }
 
-    JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(*globalData, globalObjectClass, JSCallbackObject<JSGlobalObject>::createStructure(*globalData, jsNull()));
+    JSGlobalObject* globalObject = JSCallbackObject<JSGlobalObject>::create(*vm, globalObjectClass, JSCallbackObject<JSGlobalObject>::createStructure(*vm, 0, jsNull()));
     ExecState* exec = globalObject->globalExec();
     JSValue prototype = globalObjectClass->prototype(exec);
     if (!prototype)
         prototype = jsNull();
-    globalObject->resetPrototype(*globalData, prototype);
+    globalObject->resetPrototype(*vm, prototype);
     return JSGlobalContextRetain(toGlobalRef(exec));
 }
 
@@ -115,67 +152,60 @@ JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
     ExecState* exec = toJS(ctx);
     APIEntryShim entryShim(exec);
 
-    JSGlobalData& globalData = exec->globalData();
+    VM& vm = exec->vm();
     gcProtect(exec->dynamicGlobalObject());
-    globalData.ref();
+    vm.ref();
     return ctx;
 }
 
 void JSGlobalContextRelease(JSGlobalContextRef ctx)
 {
+    IdentifierTable* savedIdentifierTable;
     ExecState* exec = toJS(ctx);
-    JSLock lock(exec);
-
-    JSGlobalData& globalData = exec->globalData();
-    JSGlobalObject* dgo = exec->dynamicGlobalObject();
-    IdentifierTable* savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(globalData.identifierTable);
-
-    // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
-    bool releasingContextGroup = globalData.refCount() == 2;
-    bool releasingGlobalObject = Heap::heap(dgo)->unprotect(dgo);
-    // If this is the last reference to a global data, it should also
-    // be the only remaining reference to the global object too!
-    ASSERT(!releasingContextGroup || releasingGlobalObject);
-
-    // An API 'JSGlobalContextRef' retains two things - a global object and a
-    // global data (or context group, in API terminology).
-    // * If this is the last reference to any contexts in the given context group,
-    //   call destroy on the heap (the global data is being  freed).
-    // * If this was the last reference to the global object, then unprotecting
-    //   it may release a lot of GC memory - tickle the activity callback to
-    //   garbage collect soon.
-    // * If there are more references remaining the the global object, then do nothing
-    //   (specifically that is more protects, which we assume come from other JSGlobalContextRefs).
-    if (releasingContextGroup) {
-        globalData.clearBuiltinStructures();
-        globalData.heap.destroy();
-    } else if (releasingGlobalObject) {
-        globalData.heap.activityCallback()->synchronize();
-        (*globalData.heap.activityCallback())();
-    }
+    {
+        JSLockHolder lock(exec);
+
+        VM& vm = exec->vm();
+        savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(vm.identifierTable);
 
-    globalData.deref();
+        bool protectCountIsZero = Heap::heap(exec->dynamicGlobalObject())->unprotect(exec->dynamicGlobalObject());
+        if (protectCountIsZero)
+            vm.heap.reportAbandonedObjectGraph();
+        vm.deref();
+    }
 
     wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable);
 }
 
 JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
 {
+    if (!ctx) {
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
     ExecState* exec = toJS(ctx);
     APIEntryShim entryShim(exec);
 
     // It is necessary to call toThisObject to get the wrapper object when used with WebCore.
-    return toRef(exec->lexicalGlobalObject()->toThisObject(exec));
+    return toRef(exec->lexicalGlobalObject()->methodTable()->toThisObject(exec->lexicalGlobalObject(), exec));
 }
 
 JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
 {
+    if (!ctx) {
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
     ExecState* exec = toJS(ctx);
-    return toRef(&exec->globalData());
+    return toRef(&exec->vm());
 }
 
 JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
 {
+    if (!ctx) {
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
     ExecState* exec = toJS(ctx);
     APIEntryShim entryShim(exec);
 
@@ -184,57 +214,48 @@ JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
     
 JSStringRef JSContextCreateBacktrace(JSContextRef ctx, unsigned maxStackSize)
 {
-    ExecState* exec = toJS(ctx);
-    JSLock lock(exec);
-
-    unsigned count = 0;
-    UStringBuilder builder;
-    CallFrame* callFrame = exec;
-    UString functionName;
-    if (exec->callee()) {
-        if (asObject(exec->callee())->inherits(&InternalFunction::s_info)) {
-            functionName = asInternalFunction(exec->callee())->name(exec);
-            builder.append("#0 ");
-            builder.append(functionName);
-            builder.append("() ");
-            count++;
-        }
+    if (!ctx) {
+        ASSERT_NOT_REACHED();
+        return 0;
     }
-    while (true) {
-        ASSERT(callFrame);
-        int signedLineNumber;
-        intptr_t sourceID;
-        UString urlString;
-        JSValue function;
-        
-        UString levelStr = UString::number(count);
-        
-        exec->interpreter()->retrieveLastCaller(callFrame, signedLineNumber, sourceID, urlString, function);
-
-        if (function)
-            functionName = asFunction(function)->name(exec);
+    ExecState* exec = toJS(ctx);
+    JSLockHolder lock(exec);
+    StringBuilder builder;
+    Vector<StackFrame> stackTrace;
+    Interpreter::getStackTrace(&exec->vm(), stackTrace, maxStackSize);
+
+    for (size_t i = 0; i < stackTrace.size(); i++) {
+        String urlString;
+        String functionName;
+        StackFrame& frame = stackTrace[i];
+        JSValue function = frame.callee.get();
+        if (frame.callee)
+            functionName = frame.friendlyFunctionName(exec);
         else {
             // Caller is unknown, but if frame is empty we should still add the frame, because
             // something called us, and gave us arguments.
-            if (count)
+            if (i)
                 break;
         }
-        unsigned lineNumber = signedLineNumber >= 0 ? signedLineNumber : 0;
+        unsigned lineNumber;
+        unsigned column;
+        frame.computeLineAndColumn(lineNumber, column);
         if (!builder.isEmpty())
-            builder.append("\n");
-        builder.append("#");
-        builder.append(levelStr);
-        builder.append(" ");
+            builder.append('\n');
+        builder.append('#');
+        builder.appendNumber(i);
+        builder.append(' ');
         builder.append(functionName);
-        builder.append("() at ");
+        builder.appendLiteral("() at ");
         builder.append(urlString);
-        builder.append(":");
-        builder.append(UString::number(lineNumber));
-        if (!function || ++count == maxStackSize)
+        if (frame.codeType != StackFrameNativeCode) {
+            builder.append(':');
+            builder.appendNumber(lineNumber);
+        }
+        if (!function)
             break;
-        callFrame = callFrame->callerFrame();
     }
-    return OpaqueJSString::create(builder.toUString()).leakRef();
+    return OpaqueJSString::create(builder.toString()).leakRef();
 }