Fixed the line retreival for find-usages.

Instead of using the pre-processed source, the original one is used.
This makes a difference when a macro is used in the line, where the pre-
processed source would have a "#gen true" token.

Task-number: QTCREATORBUG-3345

src/libs/cplusplus/FindUsages.cpp

@@ -45,13 +45,14 @@
 
 using namespace CPlusPlus;
 
-FindUsages::FindUsages(Document::Ptr doc, const Snapshot &snapshot)
+FindUsages::FindUsages(const QByteArray &originalSource, Document::Ptr doc, const Snapshot &snapshot)
     : ASTVisitor(doc->translationUnit()),
       _id(0),
       _declSymbol(0),
       _doc(doc),
       _snapshot(snapshot),
       _context(doc, snapshot),
+      _originalSource(originalSource),
       _source(_doc->source()),
       _currentScope(0)
 {
@@ -66,6 +67,7 @@ FindUsages::FindUsages(const LookupContext &context)
       _doc(context.thisDocument()),
       _snapshot(context.snapshot()),
       _context(context),
+      _originalSource(_doc->source()),
       _source(_doc->source()),
       _currentScope(0)
 {
@@ -101,27 +103,6 @@ void FindUsages::operator()(Symbol *symbol)
         translationUnit(ast->asTranslationUnit());
 }
 
-QString FindUsages::matchingLine(const Token &tk) const
-{
-    const char *beg = _source.constData();
-    const char *cp = beg + tk.offset;
-    for (; cp != beg - 1; --cp) {
-        if (*cp == '\n')
-            break;
-    }
-
-    ++cp;
-
-    const char *lineEnd = cp + 1;
-    for (; *lineEnd; ++lineEnd) {
-        if (*lineEnd == '\n')
-            break;
-    }
-
-    const QString matchingLine = QString::fromUtf8(cp, lineEnd - cp);
-    return matchingLine;
-}
-
 void FindUsages::reportResult(unsigned tokenIndex, const Name *name, Scope *scope)
 {
     if (! (tokenIndex && name != 0))
@@ -163,10 +144,9 @@ void FindUsages::reportResult(unsigned tokenIndex)
 
     _processed.insert(tokenIndex);
 
-    const QString lineText = matchingLine(tk);
-
     unsigned line, col;
     getTokenStartPosition(tokenIndex, &line, &col);
+    const QString lineText = QString::fromUtf8(_originalSource.split('\n').at(line - 1));
 
     if (col)
         --col;  // adjust the column position.

src/libs/cplusplus/FindUsages.h

@@ -62,7 +62,7 @@ public:
 class CPLUSPLUS_EXPORT FindUsages: protected ASTVisitor
 {
 public:
-    FindUsages(Document::Ptr doc, const Snapshot &snapshot);
+    FindUsages(const QByteArray &originalSource, Document::Ptr doc, const Snapshot &snapshot);
     FindUsages(const LookupContext &context);
 
     void operator()(Symbol *symbol);
@@ -75,8 +75,6 @@ protected:
 
     Scope *switchScope(Scope *scope);
 
-    QString matchingLine(const Token &tk) const;
-
     void reportResult(unsigned tokenIndex, const Name *name, Scope *scope = 0);
     void reportResult(unsigned tokenIndex, const Identifier *id, Scope *scope = 0);
     void reportResult(unsigned tokenIndex, const QList<LookupItem> &candidates);
@@ -295,6 +293,7 @@ private:
     Document::Ptr _doc;
     Snapshot _snapshot;
     LookupContext _context;
+    QByteArray _originalSource;
     QByteArray _source;
     QList<int> _references;
     QList<Usage> _usages;

src/plugins/cpptools/cppfindreferences.cpp

@@ -115,11 +115,12 @@ public:
 
         Document::Ptr doc;
         QByteArray source;
+        const QString unpreprocessedSource = getSource(fileName, workingCopy);
 
         if (symbolDocument && fileName == symbolDocument->fileName())
             doc = symbolDocument;
         else {
-            source = snapshot.preprocessedCode(getSource(fileName, workingCopy), fileName);
+            source = snapshot.preprocessedCode(unpreprocessedSource, fileName);
             doc = snapshot.documentFromSource(source, fileName);
             doc->tokenize();
         }
@@ -129,7 +130,7 @@ public:
             if (doc != symbolDocument)
                 doc->check();
 
-            FindUsages process(doc, snapshot);
+            FindUsages process(unpreprocessedSource.toUtf8(), doc, snapshot);
             process(symbol);
 
             usages = process.usages();