X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/f9bf01c6616d5ddcf65b13b33cedf9e387ff7a63..1df5f87f1309a8daa30dabdee855f48ae40d14ab:/API/JSContextRef.cpp

diff --git a/API/JSContextRef.cpp b/API/JSContextRef.cpp
index 2c76338..9c15b22 100644
--- a/API/JSContextRef.cpp
+++ b/API/JSContextRef.cpp
@@ -29,11 +29,15 @@
 
 #include "APICast.h"
 #include "InitializeThreading.h"
+#include <interpreter/CallFrame.h>
+#include <interpreter/Interpreter.h>
 #include "JSCallbackObject.h"
 #include "JSClassRef.h"
 #include "JSGlobalObject.h"
 #include "JSObject.h"
-#include <wtf/Platform.h>
+#include "UStringBuilder.h"
+#include <wtf/text/StringHash.h>
+
 
 #if OS(DARWIN)
 #include <mach-o/dyld.h>
@@ -46,7 +50,7 @@ using namespace JSC;
 JSContextGroupRef JSContextGroupCreate()
 {
     initializeThreading();
-    return toRef(JSGlobalData::createNonDefault().releaseRef());
+    return toRef(JSGlobalData::createContextGroup(ThreadStackTypeSmall).leakRef());
 }
 
 JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
@@ -66,7 +70,7 @@ JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
 #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.
-#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD)
+#ifndef BUILDING_ON_LEOPARD
     if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
 #else
     {
@@ -84,7 +88,7 @@ JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClass
     initializeThreading();
 
     JSLock lock(LockForReal);
-    RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createNonDefault();
+    RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createContextGroup(ThreadStackTypeSmall);
 
     APIEntryShim entryShim(globalData.get(), false);
 
@@ -93,16 +97,16 @@ JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClass
 #endif
 
     if (!globalObjectClass) {
-        JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject;
+        JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject(*globalData, JSGlobalObject::createStructure(*globalData, jsNull()));
         return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec()));
     }
 
-    JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(globalObjectClass);
+    JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(*globalData, globalObjectClass, JSCallbackObject<JSGlobalObject>::createStructure(*globalData, jsNull()));
     ExecState* exec = globalObject->globalExec();
     JSValue prototype = globalObjectClass->prototype(exec);
     if (!prototype)
         prototype = jsNull();
-    globalObject->resetPrototype(prototype);
+    globalObject->resetPrototype(*globalData, prototype);
     return JSGlobalContextRetain(toGlobalRef(exec));
 }
 
@@ -123,19 +127,36 @@ void JSGlobalContextRelease(JSGlobalContextRef ctx)
     JSLock lock(exec);
 
     JSGlobalData& globalData = exec->globalData();
-    IdentifierTable* savedIdentifierTable = setCurrentIdentifierTable(globalData.identifierTable);
-
-    gcUnprotect(exec->dynamicGlobalObject());
-
-    if (globalData.refCount() == 2) { // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
-        // The last reference was released, this is our last chance to collect.
+    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
-        globalData.heap.collectAllGarbage();
+    } else if (releasingGlobalObject) {
+        globalData.heap.activityCallback()->synchronize();
+        (*globalData.heap.activityCallback())();
+    }
 
     globalData.deref();
 
-    setCurrentIdentifierTable(savedIdentifierTable);
+    wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable);
 }
 
 JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
@@ -160,3 +181,60 @@ JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
 
     return toGlobalRef(exec->lexicalGlobalObject()->globalExec());
 }
+    
+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++;
+        }
+    }
+    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);
+        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)
+                break;
+        }
+        unsigned lineNumber = signedLineNumber >= 0 ? signedLineNumber : 0;
+        if (!builder.isEmpty())
+            builder.append("\n");
+        builder.append("#");
+        builder.append(levelStr);
+        builder.append(" ");
+        builder.append(functionName);
+        builder.append("() at ");
+        builder.append(urlString);
+        builder.append(":");
+        builder.append(UString::number(lineNumber));
+        if (!function || ++count == maxStackSize)
+            break;
+        callFrame = callFrame->callerFrame();
+    }
+    return OpaqueJSString::create(builder.toUString()).leakRef();
+}
+
+