Debugger: Initial shot at native Qml-and-C++ debugging

Only for GDB now, requires a debug build of Qt, not feature complete.
To enable it, run with QTC_DEBUGGER_NATIVE_MIXED=1 and press
the 'oo' button in the debugger toolbar.

Change-Id: I28aac9db13f7067e03cc364b89cc8046fa213dae
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

share/qtcreator/debugger/gdbbridge.py

@@ -285,6 +285,7 @@ class Dumper(DumperBase):
         self.typesReported = {}
         self.typesToReport = {}
         self.qtNamespaceToReport = None
+        self.qmlEngines = []
 
     def prepare(self, args):
         self.output = []
@@ -301,6 +302,7 @@ class Dumper(DumperBase):
         self.formats = {}
         self.useDynamicType = True
         self.expandedINames = {}
+        self.qmlcontext = ""
 
         # The guess does not need to be updated during a run()
         # as the result is fixed during that time (ignoring "active"
@@ -340,12 +342,14 @@ class Dumper(DumperBase):
                         self.formats[f[0:pos]] = int(f[pos+1:])
             elif arg.startswith("watchers:"):
                 self.watchers = self.hexdecode(arg[pos:])
+            elif arg.startswith("qmlcontext:"):
+                self.qmlcontext = int(arg[pos:], 0)
 
         self.useDynamicType = "dyntype" in self.options
         self.useFancy = "fancy" in self.options
         self.forceQtNamespace = "forcens" in self.options
         self.passExceptions = "pe" in self.options
-        #self.passExceptions = True
+        self.nativeMixed = "nativemixed" in self.options
         self.autoDerefPointers = "autoderef" in self.options
         self.partialUpdate = "partial" in self.options
         self.tooltipOnly = "tooltiponly" in self.options
@@ -366,6 +370,68 @@ class Dumper(DumperBase):
     def listOfLocals(self):
         frame = gdb.selected_frame()
 
+        if self.qmlcontext:
+            items = []
+
+            contextType = self.lookupQtType("QV4::Heap::CallContext")
+            context = self.createPointerValue(self.qmlcontext, contextType)
+
+            contextItem = LocalItem()
+            contextItem.iname = "local.@context"
+            contextItem.name = "[context]"
+            contextItem.value = context.dereference()
+            items.append(contextItem)
+
+            argsItem = LocalItem()
+            argsItem.iname = "local.@args"
+            argsItem.name = "[args]"
+            argsItem.value = context["callData"]
+            items.append(argsItem)
+
+            functionObject = context["function"].dereference()
+            functionPtr = functionObject["function"]
+            if not self.isNull(functionPtr):
+                compilationUnit = context["compilationUnit"]
+                compiledFunction = functionPtr["compiledFunction"]
+                base = int(compiledFunction)
+
+                formalsOffset = int(compiledFunction["formalsOffset"])
+                formalsCount = int(compiledFunction["nFormals"])
+                for index in range(formalsCount):
+                    stringIndex = self.extractInt(base + formalsOffset + 4 * index)
+                    name = self.extractQmlRuntimeString(compilationUnit, stringIndex)
+                    item = LocalItem()
+                    item.iname = "local." + name
+                    item.name = name
+                    item.value = argsItem.value["args"][index]
+                    items.append(item)
+
+                localsOffset = int(compiledFunction["localsOffset"])
+                localsCount = int(compiledFunction["nLocals"])
+                for index in range(localsCount):
+                    stringIndex = self.extractInt(base + localsOffset + 4 * index)
+                    name = self.extractQmlRuntimeString(compilationUnit, stringIndex)
+                    item = LocalItem()
+                    item.iname = "local." + name
+                    item.name = name
+                    item.value = contextData["locals"][index]
+                    items.append(item)
+
+            for engine in self.qmlEngines:
+                engineItem = LocalItem()
+                engineItem.iname = "local.@qmlengine"
+                engineItem.name = "[engine]"
+                engineItem.value = engine
+                items.append(engineItem)
+
+                rootContext = LocalItem()
+                rootContext.iname = "local.@rootContext"
+                rootContext.name = "[rootContext]"
+                rootContext.value = engine["d_ptr"]
+                items.append(rootContext)
+                break
+
+            return items
 
         try:
             block = frame.block()
@@ -452,7 +518,8 @@ class Dumper(DumperBase):
         # Locals
         #
         self.output.append('data=[')
-        if self.partialUpdate and len(self.varList) == 1:
+        if self.partialUpdate and len(self.varList) == 1 \
+                and not self.qmlcontext:
             #warn("PARTIAL: %s" % self.varList)
             parts = self.varList[0].split('.')
             #warn("PARTIAL PARTS: %s" % parts)
@@ -1699,6 +1766,59 @@ class Dumper(DumperBase):
         self.typesToReport[typestring] = typeobj
         return typeobj
 
+    def extractQmlData(self, value):
+        if value.type.code == PointerCode:
+            value = value.dereference()
+        data = value["data"]
+        return data.cast(self.lookupType(str(value.type).replace("QV4::", "QV4::Heap::")))
+
+    def extractQmlRuntimeString(self, compilationUnitPtr, index):
+        # This mimics compilationUnit->runtimeStrings[index]
+        runtimeStrings = compilationUnitPtr.dereference()["runtimeStrings"] # QV4.StringValue *
+        entry = (runtimeStrings + index)                                    # QV4.StringValue *
+        text = entry["text"]
+        (elided, fn) = self.encodeStringHelper(toInteger(text), 100)
+        return self.encodedUtf16ToUtf8(fn)                                  # string
+
+    def putQmlLocation(self, level, frame, sal):
+        engine = frame.read_var("engine")                             # QV4.ExecutionEngine *
+        if self.currentCallContext is None:
+            context = engine["current"]                               # QV4.ExecutionContext * or derived
+            self.currentCallContext = context
+        else:
+            context = self.currentCallContext["parent"]
+        ctxCode = int(context["type"])
+        compilationUnit = context["compilationUnit"]         # QV4.CompiledData.CompilationUnit *
+        functionName = "### JS ###";
+        ns = self.qtNamespace()
+
+        # QV4.ExecutionContext.Type_SimpleCallContext - 4
+        # QV4.ExecutionContext.Type_CallContext - 5
+        if ctxCode == 4 or ctxCode == 5:
+            callContextDataType = self.lookupQtType("QV4::Heap::CallContext")
+            callContext = context.cast(callContextDataType.pointer())
+            functionObject = callContext["function"]
+            function = functionObject["function"]
+            compiledFunction = function["compiledFunction"].dereference()  # QV4.CompiledData.Function
+            index = int(compiledFunction["nameIndex"])
+            functionName = "### JS ###   " + self.extractQmlRuntimeString(compilationUnit, index)
+
+        string = gdb.parse_and_eval("((%s)0x%x)->fileName()"
+            % (compilationUnit.type, compilationUnit))
+        fileName = self.encodeStringUtf8(string)
+
+        lineNumber = int(context["lineNumber"])
+        self.put(('frame={level="%s",func="%s",file="%s",'
+                 'fullname="%s",line="%s",language="js",addr="0x%x"}')
+            % (level, functionName, fileName, fileName, lineNumber, context))
+
+    def isInternalQmlFrame(self, functionName):
+        if functionName.startswith("qt_v4"):
+            return True
+        return functionName.startswith(self.qtNamespace() + "QV4::")
+
+    def isReportableQmlFrame(self, functionName):
+        return functionName.find("QV4::Moth::VME::exec") >= 0
 
     def stackListFrames(self, n, options):
         self.prepare("options:" + options + ",pe")
@@ -1706,8 +1826,7 @@ class Dumper(DumperBase):
 
         frame = gdb.newest_frame()
         i = 0
-        t1 = 'frame={level="%s",addr="0x%x",func="%s",'
-        t1 += 'file="%s",fullname="%s",line="%s",from="%s"}'
+        self.currentCallContext = None
         while i < n and frame:
             with OutputSafer(self):
                 name = frame.name()
@@ -1725,7 +1844,28 @@ class Dumper(DumperBase):
                         objfile = symtab.objfile.filename
                         fileName = symtab.filename
                         fullName = symtab.fullname()
-                self.put(t1 % (i, pc, functionName, fileName, fullName, line, objfile))
+
+                if self.nativeMixed:
+                    if self.isReportableQmlFrame(functionName):
+                        self.putQmlLocation(i, frame, sal)
+                        i += 1
+                        frame = frame.older()
+                        continue
+
+                    if self.isInternalQmlFrame(functionName):
+                        frame = frame.older()
+                        self.put(('frame={level="%s",addr="0x%x",func="%s",'
+                                'file="%s",fullname="%s",line="%s",'
+                                'from="%s",language="c",usable="0"}') %
+                            (i, pc, functionName, fileName, fullName, line, objfile))
+                        i += 1
+                        frame = frame.older()
+                        continue
+
+                self.put(('frame={level="%s",addr="0x%x",func="%s",'
+                        'file="%s",fullname="%s",line="%s",'
+                        'from="%s",language="c"}') %
+                    (i, pc, functionName, fileName, fullName, line, objfile))
 
             frame = frame.older()
             i += 1
@@ -1941,3 +2081,104 @@ def addExtraDumper(args):
     return str((head, tail))
 
 registerCommand("addExtraDumper", addExtraDumper)
+
+#######################################################################
+#
+# Native Mixed
+#
+#######################################################################
+
+class QmlEngineCreationTracker(gdb.Breakpoint):
+    def __init__(self):
+        spec = "QQmlEnginePrivate::init"
+        super(QmlEngineCreationTracker, self).\
+            __init__(spec, gdb.BP_BREAKPOINT, internal=True)
+
+    def stop(self):
+        engine = gdb.parse_and_eval("q_ptr")
+        print("QML engine created: %s" % engine)
+        theDumper.qmlEngines.append(engine)
+        return False
+
+#QmlEngineCreationTracker()
+
+class TriggeredBreakpointHookBreakpoint(gdb.Breakpoint):
+    def __init__(self):
+        spec = "qt_v4TriggeredBreakpointHook"
+        super(TriggeredBreakpointHookBreakpoint, self).\
+            __init__(spec, gdb.BP_BREAKPOINT, internal=True)
+
+    def stop(self):
+        print("QML engine stopped.")
+        return True
+
+TriggeredBreakpointHookBreakpoint()
+
+
+class ResolvePendingBreakpointsHookBreakpoint(gdb.Breakpoint):
+    def __init__(self, fullName, lineNumber):
+        self.fullName = fullName
+        self.lineNumber = lineNumber
+        spec = "qt_v4ResolvePendingBreakpointsHook"
+        print("Preparing hook to resolve pending QML breakpoint at %s:%s"
+            % (self.fullName, self.lineNumber))
+        super(ResolvePendingBreakpointsHookBreakpoint, self).\
+            __init__(spec, gdb.BP_BREAKPOINT, internal=True, temporary=False)
+
+    def stop(self):
+        bp = doInsertQmlBreakPoint(self.fullName, self.lineNumber)
+        print("Resolving QML breakpoint %s:%s -> %s"
+            % (self.fullName, self.lineNumber, bp))
+        self.enabled = False
+        return False
+
+def doInsertQmlBreakPoint(fullName, lineNumber):
+    pos = fullName.rfind('/')
+    engineName = "qrc:/" + fullName[pos+1:]
+    cmd = 'qt_v4InsertBreakpoint("%s",%s,"%s","")' \
+        % (fullName, lineNumber, engineName)
+    try:
+        bp = gdb.parse_and_eval(cmd)
+        print("Resolving QML breakpoint: %s" % bp)
+        return int(bp)
+    except RuntimeError as error:
+        print("Direct QML breakpoint insertion failed: %s" % error)
+        print("Make pending.")
+        ResolvePendingBreakpointsHookBreakpoint(fullName, lineNumber)
+        return 0
+
+def insertQmlBreakpoint(arg):
+    (fullName, lineNumber) = arg.split(' ')
+    print("Insert QML breakpoint %s:%s" % (fullName, lineNumber))
+    bp = doInsertQmlBreakPoint(fullName, lineNumber)
+    try:
+        gdb.execute("set variable qt_v4IsStepping=0")
+    except RuntimeError as error:
+        print("Resetting stepping failed: %s" % error)
+    return str(bp)
+
+registerCommand("insertQmlBreakpoint", insertQmlBreakpoint)
+
+def removeQmlBreakpoint(arg):
+    (fullName, lineNumber) = arg.split(' ')
+    pos = fullName.rfind('/')
+    engineName = "qrc:/" + fullName[pos+1:]
+    fsName = fullName
+    cmd = 'qt_v4RemoveBreakpoint("%s",%s)' % (fullName, lineNumber)
+    print("Remove QML breakpoint %s:%s" % (fullName, lineNumber))
+    try:
+        res = gdb.parse_and_eval(cmd)
+        print("Removing QML breakpoint: %s" % (cmd, res))
+        return int(res)
+    except RuntimeError as error:
+        print("Direct QML breakpoint removal failed: %s." % error)
+        return 0
+    return str(bp)
+
+registerCommand("removeQmlBreakpoint", removeQmlBreakpoint)
+
+def prepareQmlStep(arg):
+    gdb.execute("set variable qt_v4IsStepping=1")
+    return ""
+
+registerCommand("prepareQmlStep", prepareQmlStep)

share/qtcreator/debugger/qttypes.py

@@ -2255,19 +2255,49 @@ def qdump__QXmlStreamAttribute(d, value):
 #
 #######################################################################
 
+def qdump__QV4__Object(d, value):
+    d.putBetterType(d.currentType)
+    d.putItem(d.extractQmlData(value))
+
+def qdump__QV4__FunctionObject(d, value):
+    d.putBetterType(d.currentType)
+    d.putItem(d.extractQmlData(value))
+
+def qdump__QV4__CompilationUnit(d, value):
+    d.putBetterType(d.currentType)
+    d.putItem(d.extractQmlData(value))
+
+def qdump__QV4__CallContext(d, value):
+    d.putBetterType(d.currentType)
+    d.putItem(d.extractQmlData(value))
+
+def qdump__QV4__ScriptFunction(d, value):
+    d.putBetterType(d.currentType)
+    d.putItem(d.extractQmlData(value))
+
+def qdump__QV4__SimpleScriptFunction(d, value):
+    d.putBetterType(d.currentType)
+    d.putItem(d.extractQmlData(value))
+
+def qdump__QV4__ExecutionContext(d, value):
+    d.putBetterType(d.currentType)
+    d.putItem(d.extractQmlData(value))
+
 def qdump__QV4__TypedValue(d, value):
+    d.putBetterType(d.currentType)
     qdump__QV4__Value(d, d.directBaseObject(value))
-    d.putBetterType(value.type)
 
 def qdump__QV4__CallData(d, value):
     argc = toInteger(value["argc"])
-    d.putValue("<%s args>" % argc)
-    d.putNumChild(1)
+    d.putItemCount(argc)
     if d.isExpanded():
         with Children(d):
-            for i in range(0, argc + 1):
+            d.putSubItem("[this]", value["thisObject"])
+            for i in range(0, argc):
                 d.putSubItem(i, value["args"][i])
-            d.putFields(value)
+
+def qdump__QV4__String(d, value):
+    d.putStringValue(d.addressOf(value) + 2 * d.ptrSize())
 
 def qdump__QV4__Value(d, value):
     v = toInteger(str(value["val"]))
@@ -2295,7 +2325,7 @@ def qdump__QV4__Value(d, value):
         d.putBetterType("%sQV4::Value (null/bool)" % ns)
         d.putValue("(null/bool)")
     else:
-        vtable = value["m"]["data"]["internalClass"]["vtable"]
+        vtable = value["m"]["vtable"]
         if toInteger(vtable["isString"]):
             d.putBetterType("%sQV4::Value (string)" % ns)
             d.putStringValue(d.extractPointer(value) + 2 * d.ptrSize())

src/plugins/debugger/gdb/gdbengine.cpp

@@ -1379,8 +1379,10 @@ void GdbEngine::handleStopResponse(const GdbMi &data)
 
     int lineNumber = 0;
     QString fullName;
+    QByteArray function;
     if (frame.isValid()) {
         const GdbMi lineNumberG = frame["line"];
+        function = frame["func"].data();
         if (lineNumberG.isValid()) {
             lineNumber = lineNumberG.toInt();
             fullName = cleanupFullName(QString::fromLocal8Bit(frame["fullname"].data()));
@@ -1411,7 +1413,8 @@ void GdbEngine::handleStopResponse(const GdbMi &data)
     // Quickly set the location marker.
     if (lineNumber && !boolSetting(OperateByInstruction)
             && QFileInfo::exists(fullName)
-            && !isQFatalBreakpoint(rid))
+            && !isQFatalBreakpoint(rid)
+            && function != "qt_v4TriggeredBreakpointHook")
         gotoLocation(Location(fullName, lineNumber));
 
     if (!m_commandsToRunOnTemporaryBreak.isEmpty()) {
@@ -1453,7 +1456,6 @@ void GdbEngine::handleStopResponse(const GdbMi &data)
 
     QTC_ASSERT(state() == InferiorStopOk, qDebug() << state());
 
-
     if (gotoHandleStop1)
         handleStop1(data);
 }
@@ -2060,6 +2062,11 @@ void GdbEngine::executeStep()
     setTokenBarrier();
     notifyInferiorRunRequested();
     showStatusMessage(tr("Step requested..."), 5000);
+    if (isNativeMixedActive()) {
+        postCommand("prepareQmlStep 0");
+        postCommand("-exec-continue", RunRequest, CB(handleExecuteContinue));
+        return;
+    }
     if (isReverseDebugging())
         postCommand("reverse-step", RunRequest, CB(handleExecuteStep));
     else
@@ -2132,6 +2139,11 @@ void GdbEngine::executeNext()
     setTokenBarrier();
     notifyInferiorRunRequested();
     showStatusMessage(tr("Step next requested..."), 5000);
+    if (isNativeMixedActive()) {
+        postCommand("prepareQmlStep 1");
+        postCommand("-exec-continue", RunRequest, CB(handleExecuteContinue));
+        return;
+    }
     if (isReverseDebugging()) {
         postCommand("reverse-next", RunRequest, CB(handleExecuteNext));
     } else {
@@ -2887,6 +2899,15 @@ void GdbEngine::removeBreakpoint(Breakpoint bp)
 {
     QTC_CHECK(bp.state() == BreakpointRemoveRequested);
     BreakpointResponse br = bp.response();
+
+    const BreakpointParameters &data = bp.parameters();
+    if (!data.isCppBreakpoint()) {
+        postCommand("removeQmlBreakpoint " + data.fileName.toUtf8() + ' '
+                + QByteArray::number(data.lineNumber));
+        bp.notifyBreakpointRemoveOk();
+        return;
+    }
+
     if (br.id.isValid()) {
         // We already have a fully inserted breakpoint.
         bp.notifyBreakpointRemoveProceeding();
@@ -3291,7 +3312,7 @@ QByteArray GdbEngine::stackCommand(int depth)
     if (isNativeMixedEnabled()) {
         cmd = "stackListFrames " + QByteArray::number(depth) + ' ';
         if (isNativeMixedActive())
-            cmd += "mixed";
+            cmd += "nativemixed";
         else
             cmd += "noopt";
     } else {
@@ -3325,8 +3346,15 @@ StackFrame GdbEngine::parseStackFrame(const GdbMi &frameMi, int level)
     frame.from = _(frameMi["from"].data());
     frame.line = frameMi["line"].toInt();
     frame.address = frameMi["addr"].toAddress();
-    frame.usable = QFileInfo(frame.file).isReadable();
-    if (frameMi["language"].data() == "js") {
+    GdbMi usable = frameMi["usable"];
+    if (usable.isValid())
+        frame.usable = usable.data().toInt();
+    else
+        frame.usable = QFileInfo(frame.file).isReadable();
+    if (frameMi["language"].data() == "js"
+            || frame.file.endsWith(QLatin1String(".js"))
+            || frame.file.endsWith(QLatin1String(".qml"))) {
+        frame.file = QFile::decodeName(frameMi["file"].data());
         frame.language = QmlLanguage;
         frame.fixQmlFrame(startParameters());
     }
@@ -4847,6 +4875,8 @@ void GdbEngine::updateLocalsPython(const UpdateParameters &params)
         options += "autoderef,";
     if (boolSetting(UseDynamicType))
         options += "dyntype,";
+    if (isNativeMixedActive())
+        options += "nativemixed,";
     if (options.isEmpty())
         options += "defaults,";
     if (params.tryPartial)
@@ -4855,16 +4885,23 @@ void GdbEngine::updateLocalsPython(const UpdateParameters &params)
         options += "tooltiponly,";
     options.chop(1);
 
+    QByteArray context;
+    if (isNativeMixedActive()) {
+        StackFrame frame = stackHandler()->currentFrame();
+        if (frame.language == QmlLanguage)
+            context += " qmlcontext:0x" + QByteArray::number(frame.address, 16);
+    }
+
     QByteArray resultVar;
     if (!m_resultVarName.isEmpty())
         resultVar = "resultvarname:" + m_resultVarName + ' ';
 
     m_lastDebuggableCommand =
            "bb options:pe," + options + " vars:" + params.varList + ' '
-               + expanded + " watchers:" + watchers.toHex() + cutOff;
+               + expanded + " watchers:" + watchers.toHex() + cutOff + context;
 
     postCommand("bb options:" + options + " vars:" + params.varList + ' '
-            + resultVar + expanded + " watchers:" + watchers.toHex() + cutOff,
+            + resultVar + expanded + " watchers:" + watchers.toHex() + cutOff + context,
         Discardable, CB(handleStackFramePython), QVariant(params.tryPartial));
 }
 

src/plugins/debugger/gdb/gdbprocess.cpp

@@ -31,6 +31,7 @@
 #include "gdbprocess.h"
 
 #include <debugger/debuggerconstants.h>
+#include <debugger/debuggercore.h>
 #include <debugger/procinterrupt.h>
 
 namespace Debugger {
@@ -115,8 +116,11 @@ void GdbProcess::setProcessEnvironment(const QProcessEnvironment &env)
     m_gdbProc.setProcessEnvironment(env);
 }
 
-void GdbProcess::setEnvironment(const QStringList &env)
+void GdbProcess::setEnvironment(const QStringList &env_)
 {
+    QStringList env = env_;
+    if (isNativeMixedActive())
+        env.append(QLatin1String("QV4_FORCE_INTERPRETER=1")); // FIXME: REMOVE!
     m_gdbProc.setEnvironment(Utils::Environment(env));
 }