Debugger[New CDB]: First attempts at QMap<>.

Qualify map and hash nodes as Module!QMapNode<>.
Limit recursion depth of GDBMI dump.
Introduce error reporting.
Iterate QMap nodes and create artificial key/value nodes.

src/libs/qtcreatorcdbext/containers.cpp

@@ -732,16 +732,25 @@ SymbolGroupValueVector hashBuckets(SymbolGroup *sg, const std::string hashNodeTy
     return rc;
 }
 
-// Return real node type of a QHash: "class QHash<K,V>" -> [struct] "QHashNode<K,V>";
-static inline std::string qHashNodeType(std::string qHashType)
+// Return the node type of a QHash/QMap:
+// "class QHash<K,V>" -> [struct] "QtCored4!QHashNode<K,V>";
+static inline std::string qHashNodeType(const SymbolGroupValue &v,
+                                        const char *nodeType)
 {
-    qHashType.erase(0, 6); // Strip "class ";
+    std::string qHashType = v.type();
     const std::string::size_type pos = qHashType.find('<');
     if (pos != std::string::npos)
-        qHashType.insert(pos, "Node");
-    return qHashType;
+        qHashType.insert(pos, nodeType);
+    // A map node must be qualified with the current module and
+    // the Qt namespace (particularly QMapNode, QHashNodes work also for
+    // the unqualified case).
+    const QtInfo &qtInfo = QtInfo::get(v.context());
+    const std::string currentModule = v.node()->symbolGroup()->module();
+    return QtInfo::prependModuleAndNameSpace(qHashType, currentModule, qtInfo.nameSpace);
 }
 
+enum { debugMap  = 0 };
+
 // Return up to count nodes of type "QHashNode<K,V>" of a "class QHash<K,V>".
 SymbolGroupValueVector qHashNodes(const SymbolGroupValue &v,
                                   VectorIndexType count)
@@ -751,6 +760,8 @@ SymbolGroupValueVector qHashNodes(const SymbolGroupValue &v,
     const SymbolGroupValue hashData = v["d"];
     // 'e' is used as a special value to indicate empty hash buckets in the array.
     const ULONG64 ePtr = v["e"].pointerValue();
+    if (debugMap)
+        DebugPrint() << v << " Count=" << count << ",ePtr=0x" << std::hex << ePtr;
     if (!hashData || !ePtr)
         return SymbolGroupValueVector();
     // Retrieve the array of buckets of 'd'
@@ -762,7 +773,7 @@ SymbolGroupValueVector qHashNodes(const SymbolGroupValue &v,
     if (!bucketPointers)
         return SymbolGroupValueVector();
     // Get list of buckets (starting elements of 'QHashData::Node')
-    const std::string dummyNodeType = "QHashData::Node";
+    const std::string dummyNodeType =     ntext()).prependQtCoreModule("QHashData::Node");
     const SymbolGroupValueVector buckets = SymbolGroupValue::pointerSize() == 8 ?
         hashBuckets(v.node()->symbolGroup(), dummyNodeType,
                     reinterpret_cast<const ULONG64 *>(bucketPointers), numBuckets,
@@ -786,13 +797,18 @@ SymbolGroupValueVector qHashNodes(const SymbolGroupValue &v,
                 dummyNodeList.push_back(l);
                 if (dummyNodeList.size() >= count) // Stop at maximum count
                     notEnough = false;
+                if (debugMap)
+                    DebugPrint() << '#' << (dummyNodeList.size() - 1) << "l=" << l << ",next=" << next;
+                l = next;
             } else {
                 break;
             }
         }
     }
     // Finally convert them into real nodes 'QHashNode<K,V> (potentially expensive)
-    const std::string nodeType = qHashNodeType(v.type());
+    const std::string nodeType = qHashNodeType(v, "Node");
+    if (debugMap)
+        DebugPrint() << "Converting into " << nodeType;
     SymbolGroupValueVector nodeList;
     nodeList.reserve(count);
     const SymbolGroupValueVector::const_iterator dcend = dummyNodeList.end();
@@ -809,7 +825,7 @@ SymbolGroupValueVector qHashNodes(const SymbolGroupValue &v,
 // QSet<>: Contains a 'QHash<key, QHashDummyValue>' as member 'q_hash'.
 // Just dump the keys as an array.
 static inline AbstractSymbolGroupNodePtrVector
-    qSetChildList(const SymbolGroupValue &v, VectorIndexType count)
+    qSetChildList(const SymbolGroupValue &v, int count)
 {
     const SymbolGroupValue qHash = v["q_hash"];
     AbstractSymbolGroupNodePtrVector rc;
@@ -831,7 +847,7 @@ static inline AbstractSymbolGroupNodePtrVector
 
 // QHash<>: Add with fake map nodes.
 static inline AbstractSymbolGroupNodePtrVector
-    qHashChildList(const SymbolGroupValue &v, VectorIndexType count)
+    qHashChildList(const SymbolGroupValue &v, int count)
 {
     AbstractSymbolGroupNodePtrVector rc;
     if (!count)
@@ -852,6 +868,106 @@ static inline AbstractSymbolGroupNodePtrVector
     return rc;
 }
 
+// QMap<>: Return the list of QMapData::Node
+static inline SymbolGroupValueVector qMapNodes(const SymbolGroupValue &v, VectorIndexType count)
+{
+    const SymbolGroupValue e = v["e"];
+    const ULONG64 ePtr = e.pointerValue();
+    if (debugMap)
+        DebugPrint() << v.type() << " E=0x" << std::hex << ePtr;
+    if (!ePtr)
+        return SymbolGroupValueVector();
+    if (debugMap)
+        DebugPrint() << v.type() << " E=0x" << std::hex << ePtr;
+    SymbolGroupValueVector rc;
+    rc.reserve(count);
+    SymbolGroupValue n = e["forward"][unsigned(0)];
+    for (VectorIndexType i = 0; i < count && n && n.pointerValue() != ePtr; i++) {
+        rc.push_back(n);
+        n = n["forward"][unsigned(0)];
+    }
+    return rc;
+}
+
+// QMap<>: Add with fake map nodes.
+static inline AbstractSymbolGroupNodePtrVector
+    qMapChildList(const SymbolGroupValue &v, VectorIndexType count)
+{
+    if (debugMap)
+        DebugPrint() << v.type() << "," << count;
+
+    if (!count)
+        return AbstractSymbolGroupNodePtrVector();
+    // Get node type: 'class namespace::QMap<K,T>'
+    // ->'QtCored4!namespace::QMapNode<K,T>'
+    // Note: Any types QMapNode<> will not be found without modules!
+    const std::string mapNodeType = qHashNodeType(v, "Node");
+    const std::string mapPayloadNodeType = qHashNodeType(v, "PayloadNode");
+    // Calculate the offset needed (see QMap::concrete() used by the iterator).
+    const unsigned mapNodeSize = SymbolGroupValue::sizeOf(mapPayloadNodeType.c_str());
+    const unsigned payloadNodeSize = SymbolGroupValue::sizeOf(mapPayloadNodeType.c_str());
+    const unsigned pointerSize = SymbolGroupValue::pointerSize();
+    if (debugMap) {
+        DebugPrint() << v.type() << "," << mapNodeType << ':'
+                     << mapNodeSize << ',' << mapPayloadNodeType << ':' << payloadNodeSize
+                     << ", pointerSize=" << pointerSize;
+    }
+    if (!payloadNodeSize || !mapNodeSize)
+        return AbstractSymbolGroupNodePtrVector();
+    const ULONG64 payLoad  = payloadNodeSize - pointerSize;
+    // Get the value offset. Manually determine the alignment to be able
+    // to retrieve key/value without having to deal with QMapNode<> (see below).
+    // Subtract the 2 trailing pointers of the node.
+    const std::vector<std::string> innerTypes = v.innerTypes();
+    if (innerTypes.size() != 2u)
+        return AbstractSymbolGroupNodePtrVector();
+    const unsigned valueSize = SymbolGroupValue::sizeOf(innerTypes.at(1).c_str());
+    const unsigned valueOffset = mapNodeSize - valueSize - pointerSize;
+    if (debugMap)
+        DebugPrint() << "Payload=" << payLoad << ",valueOffset=" << valueOffset << ','
+                     << innerTypes.front() << ',' << innerTypes.back() << ':' << valueSize;
+    if (!valueOffset || !valueSize)
+        return AbstractSymbolGroupNodePtrVector();
+    // Get the children.
+    const SymbolGroupValueVector childNodes = qMapNodes(v, count);
+    if (debugMap)
+        DebugPrint() << "children: " << childNodes.size() << " of " << count;
+    // Deep  expansion of the forward[0] sometimes fails. In that case,
+    // take what we can get.
+    if (childNodes.size() != count)
+        count = childNodes.size();
+    // The correct way of doing this would be to construct additional symbols
+    // '*(QMapNode<K,V> *)(node_address)'. However, when doing this as of
+    // 'CDB 6.12.0002.633' (21.12.2010) IDebugSymbolGroup::AddSymbol()
+    // just fails, returning DEBUG_ANY_ID without actually doing something. So,
+    // we circumvent the map nodes and directly create key and values at their addresses.
+    AbstractSymbolGroupNodePtrVector rc;
+    rc.reserve(count);
+    std::string errorMessage;
+    SymbolGroup *sg = v.node()->symbolGroup();
+
+    for (VectorIndexType i = 0; i < count ; i++) {
+        const ULONG64 nodePtr = childNodes.at(i).pointerValue();
+        if (!nodePtr)
+            return AbstractSymbolGroupNodePtrVector();
+        const ULONG64 keyAddress = nodePtr - payLoad;
+        const std::string keyExp = pointedToSymbolName(keyAddress, innerTypes.front());
+        const std::string valueExp = pointedToSymbolName(keyAddress + valueOffset, innerTypes.at(1));
+        if (debugMap) {
+            DebugPrint() << '#' << i << '/' << count << ' ' << std::hex << ",node=0x" << nodePtr <<
+                  ',' <<keyExp << ',' << valueExp;
+        }
+        // Create the nodes
+        SymbolGroupNode *keyNode = sg->addSymbol(keyExp, std::string(), &errorMessage);
+        SymbolGroupNode *valueNode = sg->addSymbol(valueExp, std::string(), &errorMessage);
+        if (!keyNode || !valueNode)
+            return AbstractSymbolGroupNodePtrVector();
+        rc.push_back(MapNodeSymbolGroupNode::create(int(i), keyAddress,
+                                                    mapNodeType, keyNode, valueNode));
+    }
+    return rc;
+}
+
 AbstractSymbolGroupNodePtrVector containerChildren(SymbolGroupNode *node, int type,
                                                    int size, const SymbolGroupValueContext &ctx)
 {
@@ -884,6 +1000,12 @@ AbstractSymbolGroupNodePtrVector containerChildren(SymbolGroupNode *node, int ty
         break;
     case KT_QSet:
         return qSetChildList(SymbolGroupValue(node, ctx), size);
+    case KT_QMap:
+        return qMapChildList(SymbolGroupValue(node, ctx), size);
+    case KT_QMultiMap:
+        if (const SymbolGroupValue qmap = SymbolGroupValue(node, ctx)[unsigned(0)])
+            return qMapChildList(qmap, size);
+        break;
     case KT_QStringList:
         if (const SymbolGroupValue qList = SymbolGroupValue(node, ctx)[unsigned(0)])
             return qListChildList(qList, size);

src/libs/qtcreatorcdbext/qtcreatorcdbextension.cpp

@@ -109,9 +109,10 @@ static const CommandDescription commandDescriptions[] = {
  "-c complex dumpers"},
 {"locals",
  "Prints local variables of symbol group in GDBMI or debug format",
- "[-t token] [T formats] [-I formats] [-c] [-h] [-d] [-e expand-list] [-u uninitialized-list]\n<frame-number> [iname]\n"
+ "[-t token] [T formats] [-I formats] [-f debugfilter] [-c] [-h] [-d] [-e expand-list] [-u uninitialized-list]\n<frame-number> [iname]\n"
  "-h human-readable ouput\n"
  "-d debug output\n"
+ "-f debug_filter\n"
  "-c complex dumpers\n"
  "-e expand-list        Comma-separated list of inames to be expanded beforehand\n"
  "-u uninitialized-list Comma-separated list of uninitialized inames\n"
@@ -281,7 +282,7 @@ extern "C" HRESULT CALLBACK expandlocals(CIDebugClient *client, PCSTR args)
     }
 
     const unsigned succeeded = runComplexDumpers ?
-        symGroup->expandListRunComplexDumpers(inames, SymbolGroupValueContext(exc.dataSpaces()), &errorMessage) :
+        symGroup->expandListRunComplexDumpers(inames, SymbolGroupValueContext(exc.dataSpaces(), exc.symbols()), &errorMessage) :
         symGroup->expandList(inames, &errorMessage);
 
     ExtensionContext::instance().report('R', token, "expandlocals", "%u/%u %s",
@@ -298,6 +299,7 @@ static std::string commmandLocals(ExtensionCommandContext &exc,PCSTR args, int *
     // Parse the command
     unsigned debugOutput = 0;
     std::string iname;
+    std::string debugFilter;
     StringList tokens = commandTokens<StringList>(args, token);
     StringVector expandedInames;
     StringVector uninitializedInames;
@@ -324,6 +326,14 @@ static std::string commmandLocals(ExtensionCommandContext &exc,PCSTR args, int *
             split(tokens.front(), ',', std::back_inserter(uninitializedInames));
             tokens.pop_front();
             break;
+        case 'f':
+            if (tokens.empty()) {
+                *errorMessage = singleLineUsage(commandDescriptions[CmdLocals]);
+                return std::string();
+            }
+            debugFilter = tokens.front();
+            tokens.pop_front();
+            break;
         case 'e':
             if (tokens.empty()) {
                 *errorMessage = singleLineUsage(commandDescriptions[CmdLocals]);
@@ -362,7 +372,7 @@ static std::string commmandLocals(ExtensionCommandContext &exc,PCSTR args, int *
     if (!tokens.empty())
         iname = tokens.front();
 
-    const SymbolGroupValueContext dumpContext(exc.dataSpaces());
+    const SymbolGroupValueContext dumpContext(exc.dataSpaces(), exc.symbols());
     SymbolGroup * const symGroup = ExtensionContext::instance().symbolGroup(exc.symbols(), exc.threadId(), frame, errorMessage);
     if (!symGroup)
         return std::string();
@@ -379,7 +389,7 @@ static std::string commmandLocals(ExtensionCommandContext &exc,PCSTR args, int *
     }
 
     if (debugOutput)
-        return symGroup->debug(iname, debugOutput - 1);
+        return symGroup->debug(iname, debugFilter, debugOutput - 1);
 
     return iname.empty() ?
            symGroup->dump(dumpContext, parameters) :
@@ -430,7 +440,7 @@ static std::string dumplocalHelper(ExtensionCommandContext &exc,PCSTR args, int
         return std::string();
     }
     std::wstring value;
-    if (!dumpSimpleType(n->asSymbolGroupNode(), SymbolGroupValueContext(exc.dataSpaces()), &value)) {
+    if (!dumpSimpleType(n->asSymbolGroupNode(), SymbolGroupValueContext(exc.dataSpaces(), exc.symbols()), &value)) {
         *errorMessage = "Cannot dump " + iname;
         return std::string();
     }

src/libs/qtcreatorcdbext/stringutils.h

@@ -37,6 +37,7 @@
 #include <string>
 #include <sstream>
 #include <map>
+#include <functional>
 
 void trimFront(std::string &s);
 void trimBack(std::string &s);
@@ -58,6 +59,18 @@ void split(const std::string &s, char sep, Iterator it)
     }
 }
 
+// A boolean predicate that can be used for grepping sequences
+// of strings for a 'needle' substring.
+class SubStringPredicate : public std::unary_function<const std::string &, bool>
+{
+public:
+    explicit SubStringPredicate(const std::string &needle) : m_needle(needle) {}
+    bool operator()(const std::string &s) { return s.find(m_needle) != std::string::npos; }
+
+private:
+    const std::string &m_needle;
+};
+
 // Format numbers, etc, as a string.
 template <class Streamable>
 std::string toString(const Streamable s)

src/libs/qtcreatorcdbext/symbolgroup.cpp

@@ -33,10 +33,12 @@
 
 #include "symbolgroup.h"
 #include "stringutils.h"
+#include "gdbmihelpers.h"
 
 #include <set>
 #include <algorithm>
 #include <iterator>
+#include <memory>
 
 typedef std::vector<int>::size_type VectorIndexType;
 typedef std::vector<std::string> StringVector;
@@ -48,13 +50,21 @@ const char rootNameC[] = "local";
 SymbolGroup::SymbolGroup(IDebugSymbolGroup2 *sg,
                          const SymbolParameterVector &vec,
                          ULONG threadId,
-                         unsigned frame) :
+                         unsigned frame,
+                         const std::string &function) :
     m_symbolGroup(sg),
     m_threadId(threadId),
     m_frame(frame),
-    m_root(0)
+    m_root(0),
+    m_function(function)
 {
     m_root = SymbolGroupNode::create(this, rootNameC, vec);
+    // Split function 'Mod!foo'
+    const std::string::size_type exclPos = m_function.find('!');
+    if (exclPos != std::string::npos) {
+        m_module = m_function.substr(0, exclPos);
+        m_function.erase(0, exclPos + 1);
+    }
 }
 
 SymbolGroup::~SymbolGroup()
@@ -135,6 +145,7 @@ SymbolGroup *SymbolGroup::create(CIDebugControl *control, CIDebugSymbols *debugS
     IDebugSymbolGroup2 *idebugSymbols = 0;
     bool success = false;
     SymbolParameterVector parameters;
+    std::string func;
 
     // Obtain symbol group at stack frame.
     do {
@@ -149,6 +160,11 @@ SymbolGroup *SymbolGroup::create(CIDebugControl *control, CIDebugSymbols *debugS
             *errorMessage = str.str();
             break;
         }
+        StackFrame frameData;
+        if (!getFrame(frame, &frameData, errorMessage))
+            break;
+        func = wStringToString(frameData.function);
+
         hr = debugSymbols->GetScopeSymbolGroup2(DEBUG_SCOPE_GROUP_LOCALS, NULL, &idebugSymbols);
         if (FAILED(hr)) {
             *errorMessage = msgDebugEngineComFailed("GetScopeSymbolGroup2", hr);
@@ -176,7 +192,7 @@ SymbolGroup *SymbolGroup::create(CIDebugControl *control, CIDebugSymbols *debugS
             idebugSymbols->Release();
         return 0;
     }
-    return new SymbolGroup(idebugSymbols, parameters, threadId, frame);
+    return new SymbolGroup(idebugSymbols, parameters, threadId, frame, func);
 }
 
 static inline std::string msgNotFound(const std::string &nodeName)
@@ -246,16 +262,21 @@ std::string SymbolGroup::dump(const std::string &iname,
     return str.str();
 }
 
-std::string SymbolGroup::debug(const std::string &iname, unsigned verbosity) const
+std::string SymbolGroup::debug(const std::string &iname,
+                               const std::string &filter,
+                               unsigned verbosity) const
 {
     std::ostringstream str;
     str << '\n';
-    DebugSymbolGroupNodeVisitor visitor(str, verbosity);
+    std::auto_ptr<DebugSymbolGroupNodeVisitor>
+            visitor(filter.empty() ?
+            new DebugSymbolGroupNodeVisitor(str, verbosity) :
+            new DebugFilterSymbolGroupNodeVisitor(str, filter, verbosity));
     if (iname.empty()) {
-        accept(visitor);
+        accept(*visitor);
     } else {
         if (AbstractSymbolGroupNode *const node = find(iname)) {
-            node->accept(visitor, SymbolGroupNodeVisitor::parentIname(iname), 0, 0);
+            node->accept(*visitor, SymbolGroupNodeVisitor::parentIname(iname), 0, 0);
         } else {
             str << msgNotFound(iname);
         }

src/libs/qtcreatorcdbext/symbolgroup.h

@@ -55,7 +55,8 @@ private:
 
     explicit SymbolGroup(CIDebugSymbolGroup *,
                          const SymbolParameterVector &vec,
-                         ULONG threadId, unsigned frame);
+                         ULONG threadId, unsigned frame,
+                         const std::string &function);
 
 public:
     typedef AbstractSymbolGroupNode::AbstractSymbolGroupNodePtrVector AbstractSymbolGroupNodePtrVector;
@@ -73,9 +74,13 @@ public:
     // Expand node and dump
     std::string dump(const std::string &iname, const SymbolGroupValueContext &ctx,
                      const DumpParameters &p, std::string *errorMessage);
-    std::string debug(const std::string &iname = std::string(), unsigned verbosity = 0) const;
+    std::string debug(const std::string &iname = std::string(),
+                      const std::string &filter = std::string(),
+                      unsigned verbosity = 0) const;
 
     unsigned frame() const { return m_frame; }
+    std::string function() const { return m_function; }
+    std::string module() const { return m_module; }
     ULONG threadId() const { return m_threadId; }
     SymbolGroupNode *root() { return m_root; }
     const SymbolGroupNode *root() const { return m_root; }
@@ -127,6 +132,8 @@ private:
     const unsigned m_frame;
     const ULONG m_threadId;
     SymbolGroupNode *m_root;
+    std::string m_function;
+    std::string m_module;
 };
 
 #endif // SYMBOLGROUP_H

src/libs/qtcreatorcdbext/symbolgroupnode.cpp

@@ -37,6 +37,7 @@
 #include "stringutils.h"
 #include "base64.h"
 #include "containers.h"
+#include "extensioncontext.h"
 
 #include <algorithm>
 
@@ -913,6 +914,15 @@ static inline std::string msgCannotCast(const std::string &nodeName,
     return str.str();
 }
 
+static std::string msgExpandFailed(const std::string &name, const std::string &iname,
+                                   ULONG index, const std::string &why)
+{
+    std::ostringstream str;
+    str << "Expansion of '" << name << "'/'" << iname << " (index: " << index
+        << ") failed: " << why;
+    return str.str();
+}
+
 // Expand!
 bool SymbolGroupNode::expand(std::string *errorMessage)
 {
@@ -926,18 +936,21 @@ bool SymbolGroupNode::expand(std::string *errorMessage)
         return true;
     }
     if (!canExpand()) {
-        *errorMessage = "No subelements to expand in node: " + absoluteFullIName();
+        *errorMessage = msgExpandFailed(name(), absoluteFullIName(), m_index,
+                                        "No subelements to expand in node.");
         return false;
     }
     if (flags() & Uninitialized) {
-        *errorMessage = "Refusing to expand uninitialized node: " + absoluteFullIName();
+        *errorMessage = msgExpandFailed(name(), absoluteFullIName(), m_index,
+                                        "Refusing to expand uninitialized node.");
         return false;
     }
 
     const HRESULT hr = m_symbolGroup->debugSymbolGroup()->ExpandSymbol(m_index, TRUE);
 
     if (FAILED(hr)) {
-        *errorMessage = msgDebugEngineComFailed("ExpandSymbol", hr);
+        *errorMessage = msgExpandFailed(name(), absoluteFullIName(), m_index, msgDebugEngineComFailed("ExpandSymbol", hr));
+        ExtensionContext::instance().report('X', 0, "Error", "%s", errorMessage->c_str());
         return false;
     }
     SymbolGroup::SymbolParameterVector parameters;
@@ -945,8 +958,10 @@ bool SymbolGroupNode::expand(std::string *errorMessage)
     // and corrected SubElement count (might be estimate))
     if (!SymbolGroup::getSymbolParameters(m_symbolGroup->debugSymbolGroup(),
                                           m_index, m_parameters.SubElements + 1,
-                                          &parameters, errorMessage))
+                                          &parameters, errorMessage)) {
+        *errorMessage = msgExpandFailed(name(), absoluteFullIName(), m_index, *errorMessage);
         return false;
+    }
     // Before inserting children, correct indexes on whole group
     m_symbolGroup->root()->notifyExpanded(m_index + 1, parameters.at(0).SubElements);
     // Parse parameters, correct our own) and create child nodes.
@@ -1005,12 +1020,21 @@ SymbolGroupNode *SymbolGroupNode::addSymbolByName(const std::string &name,
     HRESULT hr = m_symbolGroup->debugSymbolGroup()->AddSymbol(name.c_str(), &index);
     if (FAILED(hr)) {
         *errorMessage = msgCannotAddSymbol(name, msgDebugEngineComFailed("AddSymbol", hr));
+        ExtensionContext::instance().report('X', 0, "Error", "%s", errorMessage->c_str());
+        return 0;
+    }
+    if (index == DEBUG_ANY_ID) { // Occasionally happens for unknown or 'complicated' types
+        *errorMessage = msgCannotAddSymbol(name, "DEBUG_ANY_ID was returned as symbol index by AddSymbol.");
+        ExtensionContext::instance().report('X', 0, "Error", "%s", errorMessage->c_str());
         return 0;
     }
     SymbolParameterVector parameters(1, DEBUG_SYMBOL_PARAMETERS());
     hr = m_symbolGroup->debugSymbolGroup()->GetSymbolParameters(index, 1, &(*parameters.begin()));
     if (FAILED(hr)) { // Should never fail
-        *errorMessage = msgCannotAddSymbol(name, msgDebugEngineComFailed("GetSymbolParameters", hr));
+        std::ostringstream str;
+        str << "Cannot retrieve 1 symbol parameter entry at " << index << ": "
+            << msgDebugEngineComFailed("GetSymbolParameters", hr);
+        *errorMessage = msgCannotAddSymbol(name, str.str());
         return 0;
     }
     // Paranoia: Check for cuckoo's eggs (which should not happen)
@@ -1137,6 +1161,24 @@ SymbolGroupNodeVisitor::VisitResult
     return VisitContinue;
 }
 
+DebugFilterSymbolGroupNodeVisitor::DebugFilterSymbolGroupNodeVisitor(std::ostream &os,
+                                                                     const std::string &filter,
+                                                                     const unsigned verbosity) :
+    DebugSymbolGroupNodeVisitor(os, verbosity), m_filter(filter)
+{
+}
+
+SymbolGroupNodeVisitor::VisitResult
+    DebugFilterSymbolGroupNodeVisitor::visit(AbstractSymbolGroupNode *node,
+                                             const std::string &fullIname,
+                                             unsigned child, unsigned depth)
+{
+    if (fullIname.find(m_filter) == std::string::npos
+        && node->name().find(m_filter) == std::string::npos)
+        return SymbolGroupNodeVisitor::VisitContinue;
+    return DebugSymbolGroupNodeVisitor::visit(node, fullIname, child, depth);
+}
+
 // --------------------- DumpSymbolGroupNodeVisitor
 DumpSymbolGroupNodeVisitor::DumpSymbolGroupNodeVisitor(std::ostream &os,
                                                        const SymbolGroupValueContext &context,
@@ -1158,9 +1200,10 @@ SymbolGroupNodeVisitor::VisitResult
     // Recurse to children only if expanded by explicit watchmodel request
     // and initialized.
     m_visitChildren = true;
-    // Visit children of a SymbolGroupNode only if not expanded by its dumpers
+    // Visit children of a SymbolGroupNode only if not expanded by its dumpers.
+    // Report only one level for Qt Creator.
     if (SymbolGroupNode *snode = node->asSymbolGroupNode())
-        m_visitChildren = snode->isExpanded()
+        m_visitChildren = depth < 1 && snode->isExpanded()
             && (flags & (SymbolGroupNode::Uninitialized|SymbolGroupNode::ExpandedByDumper)) == 0;
     // Comma between same level children given obscured children
     if (depth == m_lastDepth) {

src/libs/qtcreatorcdbext/symbolgroupnode.h

@@ -352,7 +352,7 @@ protected:
         VisitStop
     };
 
-private:
+protected:
     virtual VisitResult visit(AbstractSymbolGroupNode *node,
                               const std::string &fullIname,
                               unsigned child, unsigned depth) = 0;
@@ -365,15 +365,32 @@ class DebugSymbolGroupNodeVisitor : public SymbolGroupNodeVisitor {
 public:
     explicit DebugSymbolGroupNodeVisitor(std::ostream &os, unsigned verbosity = 0);
 
-private:
+protected:
     virtual VisitResult visit(AbstractSymbolGroupNode *node,
                               const std::string &fullIname,
                               unsigned child, unsigned depth);
 
+private:
     std::ostream &m_os;
     const unsigned m_verbosity;
 };
 
+// Debug filtering output visitor.
+class DebugFilterSymbolGroupNodeVisitor : public DebugSymbolGroupNodeVisitor {
+public:
+    explicit DebugFilterSymbolGroupNodeVisitor(std::ostream &os,
+                                               const std::string &filter,
+                                               const unsigned verbosity = 0);
+
+protected:
+    virtual VisitResult visit(AbstractSymbolGroupNode *node,
+                              const std::string &fullIname,
+                              unsigned child, unsigned depth);
+
+private:
+    const std::string m_filter;
+};
+
 // GDBMI dump output visitor.
 class DumpSymbolGroupNodeVisitor : public SymbolGroupNodeVisitor {
 public:
@@ -381,12 +398,13 @@ public:
                                         const SymbolGroupValueContext &context,
                                         const DumpParameters &parameters = DumpParameters());
 
-private:
+protected:
     virtual VisitResult visit(AbstractSymbolGroupNode *node,
                               const std::string &fullIname,
                               unsigned child, unsigned depth);
     virtual void childrenVisited(const AbstractSymbolGroupNode *  node, unsigned depth);
 
+private:
     std::ostream &m_os;
     const SymbolGroupValueContext &m_context;
     const DumpParameters &m_parameters;

src/libs/qtcreatorcdbext/symbolgroupvalue.cpp

@@ -37,6 +37,14 @@
 #include "containers.h"
 
 #include <iomanip>
+#include <algorithm>
+
+SymbolGroupValue::SymbolGroupValue(const std::string &parentError) :
+    m_node(0), m_errorMessage(parentError)
+{
+    if (m_errorMessage.empty())
+        m_errorMessage = "Invalid";
+}
 
 SymbolGroupValue::SymbolGroupValue(SymbolGroupNode *node,
                                    const SymbolGroupValueContext &ctx) :
@@ -62,7 +70,7 @@ SymbolGroupValue SymbolGroupValue::operator[](unsigned index) const
         if (index < m_node->children().size())
             if (SymbolGroupNode *n = m_node->childAt(index)->asSymbolGroupNode())
                 return SymbolGroupValue(n, m_context);
-    return SymbolGroupValue();
+    return SymbolGroupValue(m_errorMessage);
 }
 
 bool SymbolGroupValue::ensureExpanded() const
@@ -88,7 +96,7 @@ SymbolGroupValue SymbolGroupValue::operator[](const char *name) const
         if (AbstractSymbolGroupNode *child = m_node->childByIName(name))
             if (SymbolGroupNode *n = child->asSymbolGroupNode())
                 return SymbolGroupValue(n, m_context);
-    return SymbolGroupValue();
+    return SymbolGroupValue(m_errorMessage);
 }
 
 std::string SymbolGroupValue::type() const
@@ -253,6 +261,12 @@ unsigned SymbolGroupValue::pointerSize()
     return ps;
 }
 
+unsigned SymbolGroupValue::intSize()
+{
+    static const unsigned is = SymbolGroupValue::sizeOf("int");
+    return is;
+}
+
 std::string SymbolGroupValue::stripPointerType(const std::string &t)
 {
     return isPointerType(t) ? t.substr(0, t.size() - 2) : t;
@@ -279,6 +293,145 @@ std::string SymbolGroupValue::stripArrayType(const std::string &t)
     return t;
 }
 
+/* QtInfo helper: Determine the full name of a Qt Symbol like 'qstrdup' in 'QtCored4'.
+ * as 'QtCored4![namespace::]qstrdup'. In the event someone really uses a different
+ * library prefix or namespaced Qt, this should be found.
+ * The crux is here that the underlying IDebugSymbols::StartSymbolMatch()
+ * does not accept module wildcards (as opposed to the 'x' command where 'x QtCo*!*qstrdup'
+ * would be acceptable and fast). OTOH, doing a wildcard search like '*qstrdup' is
+ * very slow and should be done only if there is really a different namespace or lib prefix.
+ * Parameter 'modulePatternC' is used to do a search on the modules returned (due to
+ * the amiguities and artifacts that appear like 'QGuid4!qstrdup'). */
+static inline std::string resolveQtSymbol(const char *symbolC,
+                                          const char *defaultModuleNameC,
+                                          const char *modulePatternC,
+                                          const SymbolGroupValueContext &ctx)
+{
+    typedef std::list<std::string> StringList;
+    typedef StringList::const_iterator StringListConstIt;
+
+    // First try a match with the default module name 'QtCored4!qstrdup' for speed reasons
+    std::string defaultPattern = defaultModuleNameC;
+    defaultPattern.push_back('!');
+    defaultPattern += symbolC;
+    const StringList defaultMatches = SymbolGroupValue::resolveSymbol(defaultPattern.c_str(), ctx);
+    const SubStringPredicate modulePattern(modulePatternC);
+    const StringListConstIt defaultIt = std::find_if(defaultMatches.begin(), defaultMatches.end(), modulePattern);
+    if (defaultIt !=  defaultMatches.end())
+        return *defaultIt;
+    // Fail, now try a search with '*qstrdup' in all modules. This might return several matches
+    // like 'QtCored4!qstrdup', 'QGuid4!qstrdup'
+    const std::string wildCardPattern = std::string(1, '*') + symbolC;
+    const StringList allMatches = SymbolGroupValue::resolveSymbol(wildCardPattern.c_str(), ctx);
+    const StringListConstIt allIt = std::find_if(allMatches.begin(), allMatches.end(), modulePattern);
+    return allIt != allMatches.end() ? *allIt : std::string();
+}
+
+const QtInfo &QtInfo::get(const SymbolGroupValueContext &ctx)
+{
+    static const char qtCoreDefaultModule[] = "QtCored4";
+    static QtInfo rc;
+    if (!rc.coreModule.empty())
+        return rc;
+
+    do {
+        // Lookup qstrdup() to hopefully get module and namespace
+        // Typically, this resolves to 'QtGuid4!qstrdup' and 'QtCored4!qstrdup'...
+        const std::string qualifiedSymbol = resolveQtSymbol("qstrdup", qtCoreDefaultModule, "Core", ctx);
+        if (qualifiedSymbol.empty()) {
+            rc.coreModule = qtCoreDefaultModule;
+            break;
+        }
+        // Should be 'QtCored4!qstrdup'
+        const std::string::size_type exclPos = qualifiedSymbol.find('!');
+        if (exclPos == std::string::npos) {
+            rc.coreModule = qtCoreDefaultModule;
+            break;
+        }
+        rc.coreModule = qualifiedSymbol.substr(0, exclPos);
+        // Any namespace? 'QtCored4!nsp::qstrdup'
+        const std::string::size_type nameSpaceStart = exclPos + 1;
+        const std::string::size_type colonPos = qualifiedSymbol.find(':', nameSpaceStart);
+        if (colonPos != std::string::npos)
+            rc.nameSpace = qualifiedSymbol.substr(nameSpaceStart, colonPos - nameSpaceStart);
+    } while (false);
+    return rc;
+}
+
+std::string QtInfo::prependModuleAndNameSpace(const std::string &type,
+                                              const std::string &module,
+                                              const std::string &aNameSpace)
+{
+    // Strip the prefixes "class ", "struct ".
+    std::string rc = type;
+    if (rc.compare(0, 6, "class ") == 0) {
+        rc.erase(0, 6);
+    } else {
+        if (rc.compare(0, 7, "struct ") == 0)
+            rc.erase(0, 7);
+    }
+    // Is the namespace 'nsp::' missing?
+    if (!aNameSpace.empty()) {
+        const bool nameSpaceMissing = rc.size() <= aNameSpace.size()
+                || rc.compare(0, aNameSpace.size(), aNameSpace) != 0
+                || rc.at(aNameSpace.size()) != ':';
+        if (nameSpaceMissing) {
+            rc.insert(0, "::");
+            rc.insert(0, aNameSpace);
+        }
+    }
+    // Is the module 'Foo!' missing?
+    if (!module.empty()) {
+        const bool moduleMissing = rc.size() <= module.size()
+                || rc.compare(0, module.size(), module) != 0
+                || rc.at(module.size()) != '!';
+        if (moduleMissing) {
+            rc.insert(0, 1, '!');
+            rc.insert(0, module);
+        }
+    }
+    return rc;
+}
+
+std::list<std::string>
+    SymbolGroupValue::resolveSymbol(const char *pattern,
+                                    const SymbolGroupValueContext &c,
+                                    std::string *errorMessage /* = 0 */)
+{
+    enum { bufSize = 2048 };
+    std::list<std::string> rc;
+    if (errorMessage)
+        errorMessage->clear();
+    // Is it an incomplete symbol?
+    if (!pattern[0])
+        return rc;
+
+    ULONG64 handle = 0;
+    // E_NOINTERFACE means "no match". Apparently, it does not always
+    // set handle.
+    HRESULT hr = c.symbols->StartSymbolMatch(pattern, &handle);
+    if (hr == E_NOINTERFACE) {
+        if (handle)
+            c.symbols->EndSymbolMatch(handle);
+        return rc;
+    }
+    if (FAILED(hr)) {
+        if (errorMessage)
+            *errorMessage= msgDebugEngineComFailed("StartSymbolMatch", hr);
+        return rc;
+    }
+    char buf[bufSize];
+    while (true) {
+        hr = c.symbols->GetNextSymbolMatch(handle, buf, bufSize - 1, 0, 0);
+        if (hr == E_NOINTERFACE)
+            break;
+        if (hr == S_OK)
+            rc.push_back(std::string(buf));
+    }
+    c.symbols->EndSymbolMatch(handle);
+    return rc;
+}
+
 // get the inner types: "QMap<int, double>" -> "int", "double"
 std::vector<std::string> SymbolGroupValue::innerTypesOf(const std::string &t)
 {

src/libs/qtcreatorcdbext/symbolgroupvalue.h

@@ -39,16 +39,18 @@
 
 #include <string>
 #include <vector>
+#include <list>
 
 class SymbolGroupNode;
 
 // Structure to pass all IDebug interfaces used for SymbolGroupValue
 struct SymbolGroupValueContext
 {
-    SymbolGroupValueContext(CIDebugDataSpaces *ds) : dataspaces(ds) {}
-    SymbolGroupValueContext::SymbolGroupValueContext() : dataspaces(0) {}
+    SymbolGroupValueContext(CIDebugDataSpaces *ds, CIDebugSymbols *s) : dataspaces(ds), symbols(s) {}
+    SymbolGroupValueContext::SymbolGroupValueContext() : dataspaces(0), symbols(0) {}
 
     CIDebugDataSpaces *dataspaces;
+    CIDebugSymbols *symbols;
 };
 
 /* SymbolGroupValue: Flyweight tied to a SymbolGroupNode
@@ -57,6 +59,8 @@ struct SymbolGroupValueContext
 
 class SymbolGroupValue
 {
+    explicit SymbolGroupValue(const std::string &parentError);
+
 public:
     explicit SymbolGroupValue(SymbolGroupNode *node, const SymbolGroupValueContext &c);
     SymbolGroupValue();
@@ -98,7 +102,11 @@ public:
     static std::string addPointerType(const std::string &);
     static std::string stripArrayType(const std::string &);
     static bool isPointerType(const std::string &);
+    static std::list<std::string> resolveSymbol(const char *pattern,
+                                                const SymbolGroupValueContext &c,
+                                                std::string *errorMessage = 0);
     static unsigned pointerSize();
+    static unsigned intSize();
 
     // get the inner types: "QMap<int, double>" -> "int", "double"
     static std::vector<std::string> innerTypesOf(const std::string &t);
@@ -115,6 +123,25 @@ private:
 // For debugging purposes
 std::ostream &operator<<(std::ostream &, const SymbolGroupValue &v);
 
+// Qt Information: Namespace and module.
+struct QtInfo
+{
+    static const QtInfo &get(const SymbolGroupValueContext &ctx);
+
+    // Prepend core module and Qt namespace. To be able to work with some
+    // 'complicated' types like QMapNode, specifying the module helps
+    std::string prependQtCoreModule(const std::string &type) const
+        { return QtInfo::prependModuleAndNameSpace(type, coreModule, nameSpace); }
+    // Prepend module and namespace if missing with some smartness
+    // ('Foo' or -> 'nsp::Foo') => 'QtCored4!nsp::Foo'
+    static std::string prependModuleAndNameSpace(const std::string &type,
+                                                 const std::string &module,
+                                                 const std::string &nameSpace);
+
+    std::string nameSpace;
+    std::string coreModule;
+};
+
 /* Helpers for detecting types reported from IDebugSymbolGroup
  * 1) Class prefix==true is applicable to outer types obtained from
  *    from IDebugSymbolGroup: 'class foo' or 'struct foo'.