Removed the MacroResolver

Unfortunately, the MacroResolver does not scale and we get pretty bad performances when parsing big projects.
(cherry picked from commit 77aa3064783d64cc7d028772a59f13e5f0cd4780)

9 files changed, 3 insertions, 119 deletions

diff --git a/src/libs/cplusplus/FastPreprocessor.cpp b/src/libs/cplusplus/FastPreprocessor.cpp
index 4a4c10d732..b61f61cee7 100644
--- a/src/libs/cplusplus/FastPreprocessor.cpp
+++ b/src/libs/cplusplus/FastPreprocessor.cpp
@@ -34,55 +34,6 @@
 
 using namespace CPlusPlus;
 
-FastMacroResolver::FastMacroResolver(TranslationUnit *unit, const Snapshot &snapshot)
-    : _unit(unit), _snapshot(snapshot)
-{
-    const QString fileName = QString::fromUtf8(unit->fileName(), unit->fileNameLength());
-
-    QSet<QString> processed;
-    updateCache(fileName, &processed);
-}
-
-bool FastMacroResolver::isMacro(TranslationUnit *unit, unsigned tokenIndex) const
-{
-    if (unit != _unit){
-        qWarning() << Q_FUNC_INFO << "unexpected translation unit:" << unit->fileName();
-        return false;
-    }
-
-    const Token &tk = unit->tokenAt(tokenIndex);
-    if (tk.isNot(T_IDENTIFIER))
-        return false;
-
-    Identifier *id = tk.identifier;
-    const QByteArray macroName = QByteArray::fromRawData(id->chars(), id->size());
-    return _cachedMacros.contains(macroName);
-}
-
-void FastMacroResolver::updateCache(const QString &fileName, QSet<QString> *processed)
-{
-    if (processed->contains(fileName))
-        return;
-
-    processed->insert(fileName);
-
-    if (Document::Ptr doc = _snapshot.value(fileName)) {
-        const QList<Macro> definedMacros = doc->definedMacros();
-
-        for (int i = definedMacros.size() - 1; i != -1; --i) {
-            const Macro &macro = definedMacros.at(i);
-
-            if (macro.isHidden())
-                _cachedMacros.remove(macro.name());
-            else
-                _cachedMacros.insert(macro.name());
-        }
-
-        foreach (const Document::Include &incl, doc->includes())
-            updateCache(incl.fileName(), processed);
-    }
-}
-
 FastPreprocessor::FastPreprocessor(const Snapshot &snapshot)
     : _snapshot(snapshot),
       _preproc(this, &_env)
diff --git a/src/libs/cplusplus/FastPreprocessor.h b/src/libs/cplusplus/FastPreprocessor.h
index 83d1bb257f..ebbc8d1752 100644
--- a/src/libs/cplusplus/FastPreprocessor.h
+++ b/src/libs/cplusplus/FastPreprocessor.h
@@ -41,22 +41,6 @@
 
 namespace CPlusPlus {
 
-class CPLUSPLUS_EXPORT FastMacroResolver: public MacroResolver
-{
-public:
-    FastMacroResolver(TranslationUnit *unit, const Snapshot &snapshot);
-
-    virtual bool isMacro(TranslationUnit *unit, unsigned tokenIndex) const;
-
-private:
-    void updateCache(const QString &fileName, QSet<QString> *processed);
-
-private:
-    TranslationUnit *_unit;
-    Snapshot _snapshot;
-    QSet<QByteArray> _cachedMacros;
-};
-
 class CPLUSPLUS_EXPORT FastPreprocessor: public Client
 {
     Environment _env;
diff --git a/src/plugins/cppeditor/cppeditor.cpp b/src/plugins/cppeditor/cppeditor.cpp
index d048f6dee9..13228855f9 100644
--- a/src/plugins/cppeditor/cppeditor.cpp
+++ b/src/plugins/cppeditor/cppeditor.cpp
@@ -2090,11 +2090,7 @@ SemanticInfo SemanticHighlighter::semanticInfo(const Source &source)
 
         snapshot = source.snapshot;
         doc = source.snapshot.documentFromSource(preprocessedCode, source.fileName);
-
-        FastMacroResolver fastMacroResolver(doc->translationUnit(), snapshot);
-        doc->control()->setMacroResolver(&fastMacroResolver);
         doc->check();
-        doc->control()->setMacroResolver(0);
     }
 
     Control *control = doc->control();
diff --git a/src/plugins/cpptools/cppfindreferences.cpp b/src/plugins/cpptools/cppfindreferences.cpp
index 6d9b9f8d0e..26f9a18696 100644
--- a/src/plugins/cpptools/cppfindreferences.cpp
+++ b/src/plugins/cpptools/cppfindreferences.cpp
@@ -531,13 +531,7 @@ static void find_helper(QFutureInterface<Utils::FileSearchResult> &future,
         if (Identifier *id = control->findIdentifier(symbolId->chars(), symbolId->size())) {
             QTime tm;
             tm.start();
-            TranslationUnit *unit = doc->translationUnit();
-            Control *control = doc->control();
-
-            FastMacroResolver fastMacroResolver(unit, snapshot);
-            control->setMacroResolver(&fastMacroResolver);
             doc->parse();
-            control->setMacroResolver(0);
 
             //qDebug() << "***" << unit->fileName() << "parsed in:" << tm.elapsed();
 
@@ -548,6 +542,8 @@ static void find_helper(QFutureInterface<Utils::FileSearchResult> &future,
             tm.start();
 
             Process process(doc, snapshot, &future);
+
+            TranslationUnit *unit = doc->translationUnit();
             process(symbol, id, unit->ast());
 
             //qDebug() << "***" << unit->fileName() << "processed in:" << tm.elapsed();
diff --git a/src/shared/cplusplus/CPlusPlusForwardDeclarations.h b/src/shared/cplusplus/CPlusPlusForwardDeclarations.h
index 2467d4c56b..b060f11dfa 100644
--- a/src/shared/cplusplus/CPlusPlusForwardDeclarations.h
+++ b/src/shared/cplusplus/CPlusPlusForwardDeclarations.h
@@ -83,7 +83,6 @@ class Semantic;
 class Control;
 class MemoryPool;
 class DiagnosticClient;
-class MacroResolver;
 
 class Identifier;
 class Literal;
diff --git a/src/shared/cplusplus/Control.cpp b/src/shared/cplusplus/Control.cpp
index 6338d99fd2..30c5552bbe 100644
--- a/src/shared/cplusplus/Control.cpp
+++ b/src/shared/cplusplus/Control.cpp
@@ -59,11 +59,6 @@
 
 CPLUSPLUS_BEGIN_NAMESPACE
 
-MacroResolver::MacroResolver()
-{ }
-
-MacroResolver::~MacroResolver()
-{ }
 
 template <typename _Iterator>
 static void delete_map_entries(_Iterator first, _Iterator last)
@@ -93,8 +88,7 @@ public:
     Data(Control *control)
         : control(control),
           translationUnit(0),
-          diagnosticClient(0),
-          macroResolver(0)
+          diagnosticClient(0)
     { }
 
     ~Data()
@@ -539,7 +533,6 @@ public:
     Control *control;
     TranslationUnit *translationUnit;
     DiagnosticClient *diagnosticClient;
-    MacroResolver *macroResolver;
     LiteralTable<Identifier> identifiers;
     LiteralTable<StringLiteral> stringLiterals;
     LiteralTable<NumericLiteral> numericLiterals;
@@ -602,12 +595,6 @@ TranslationUnit *Control::switchTranslationUnit(TranslationUnit *unit)
     return previousTranslationUnit;
 }
 
-MacroResolver *Control::macroResolver() const
-{ return d->macroResolver; }
-
-void Control::setMacroResolver(MacroResolver *macroResolver)
-{ d->macroResolver = macroResolver; }
-
 DiagnosticClient *Control::diagnosticClient() const
 { return d->diagnosticClient; }
 
diff --git a/src/shared/cplusplus/Control.h b/src/shared/cplusplus/Control.h
index 060be182b6..9a41629fea 100644
--- a/src/shared/cplusplus/Control.h
+++ b/src/shared/cplusplus/Control.h
@@ -55,18 +55,6 @@
 CPLUSPLUS_BEGIN_HEADER
 CPLUSPLUS_BEGIN_NAMESPACE
 
-class CPLUSPLUS_EXPORT MacroResolver
-{
-    MacroResolver(const MacroResolver &other);
-    void operator = (const MacroResolver &other);
-
-public:
-    MacroResolver();
-    virtual ~MacroResolver();
-
-    virtual bool isMacro(TranslationUnit *unit, unsigned tokenIndex) const = 0;
-};
-
 class CPLUSPLUS_EXPORT Control
 {
 public:
@@ -76,9 +64,6 @@ public:
     TranslationUnit *translationUnit() const;
     TranslationUnit *switchTranslationUnit(TranslationUnit *unit);
 
-    MacroResolver *macroResolver() const;
-    void setMacroResolver(MacroResolver *macroResolver);
-
     DiagnosticClient *diagnosticClient() const;
     void setDiagnosticClient(DiagnosticClient *diagnosticClient);
 
diff --git a/src/shared/cplusplus/Parser.cpp b/src/shared/cplusplus/Parser.cpp
index d335b5ebff..958d740a58 100644
--- a/src/shared/cplusplus/Parser.cpp
+++ b/src/shared/cplusplus/Parser.cpp
@@ -244,14 +244,6 @@ void Parser::match(int kind, unsigned *token)
     }
 }
 
-bool Parser::isMacro(unsigned tokenIndex) const
-{
-    if (MacroResolver *r = _control->macroResolver())
-        return r->isMacro(_translationUnit, tokenIndex);
-
-    return false;
-}
-
 bool Parser::parseClassOrNamespaceName(NameAST *&node)
 {
     if (LA() == T_IDENTIFIER) {
@@ -2561,10 +2553,6 @@ bool Parser::parseBuiltinTypeSpecifier(SpecifierAST *&node)
 bool Parser::parseSimpleDeclaration(DeclarationAST *&node,
                                     bool acceptStructDeclarator)
 {
-    if (LA() == T_IDENTIFIER && isMacro(cursor())) {
-        // printf("***** found macro reference `%s'\n", tok().identifier->chars());
-    }
-
     unsigned qt_invokable_token = 0;
     if (acceptStructDeclarator && (LA() == T_Q_SIGNAL || LA() == T_Q_SLOT))
         qt_invokable_token = consumeToken();
diff --git a/src/shared/cplusplus/Parser.h b/src/shared/cplusplus/Parser.h
index 1bd6700f53..2f274e93ab 100644
--- a/src/shared/cplusplus/Parser.h
+++ b/src/shared/cplusplus/Parser.h
@@ -286,8 +286,6 @@ private:
     inline void rewind(unsigned cursor)
     { _tokenIndex = cursor; }
 
-    bool isMacro(unsigned tokenIndex) const;
-
 private:
     TranslationUnit *_translationUnit;
     Control *_control;