support for compiler rewriters

Change-Id: I12e98ac9fc49ef2007914324006a396d183b778c

1 files changed, 144 insertions, 0 deletions

diff --git a/compilerplugins/clang/plugin.cxx b/compilerplugins/clang/plugin.cxx
new file mode 100644
index 000000000000..115193c14137
--- /dev/null
+++ b/compilerplugins/clang/plugin.cxx
@@ -0,0 +1,144 @@
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * Based on LLVM/Clang.
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ */
+
+#include "plugin.hxx"
+
+#include <clang/AST/ASTConsumer.h>
+#include <clang/AST/ASTContext.h>
+#include <clang/Basic/FileManager.h>
+#include <clang/Frontend/CompilerInstance.h>
+#include <clang/Frontend/FrontendAction.h>
+#include <clang/Frontend/FrontendPluginRegistry.h>
+#include <clang/Rewrite/Rewriter.h>
+
+#include "bodynotinblock.hxx"
+#include "lclstaticfix.hxx"
+#include "sallogareas.hxx"
+#include "unusedvariablecheck.hxx"
+
+namespace loplugin
+{
+
+Plugin::Plugin( ASTContext& context )
+    : context( context )
+    {
+    }
+
+DiagnosticBuilder Plugin::report( DiagnosticsEngine::Level level, StringRef message, SourceLocation loc )
+    {
+    DiagnosticsEngine& diag = context.getDiagnostics();
+#if 0
+    // Do some mappings (e.g. for -Werror) that clang does not do for custom messages for some reason.
+    if( level == DiagnosticsEngine::Warning && diag.getWarningsAsErrors())
+        level = DiagnosticsEngine::Error;
+    if( level == DiagnosticsEngine::Error && diag.getErrorsAsFatal())
+        level = DiagnosticsEngine::Fatal;
+#endif
+    if( loc.isValid())
+        return diag.Report( loc, diag.getCustomDiagID( level, message ));
+    else
+        return diag.Report( diag.getCustomDiagID( level, message ));
+    }
+
+bool Plugin::ignoreLocation( SourceLocation loc )
+    {
+    return context.getSourceManager().isInSystemHeader( context.getSourceManager().getExpansionLoc( loc ));
+    }
+
+/**
+ Class that manages all LO modules.
+*/
+class PluginHandler
+    : public ASTConsumer
+    {
+    public:
+        explicit PluginHandler( ASTContext& context, const vector< string >& args )
+            : rewriter( context.getSourceManager(), context.getLangOpts())
+            , args( args )
+            , bodyNotInBlock( context )
+            , lclStaticFix( context, rewriter )
+            , salLogAreas( context )
+            , unusedVariableCheck( context )
+            {
+            }
+        virtual void HandleTranslationUnit( ASTContext& context )
+            {
+            if( context.getDiagnostics().hasErrorOccurred())
+                return;
+            if( isArg( "lclstaticfix" ))
+                lclStaticFix.run();
+            else if( args.empty())
+                {
+                bodyNotInBlock.run();
+                salLogAreas.run();
+                unusedVariableCheck.run();
+                }
+            else
+                {
+                DiagnosticsEngine& diag = context.getDiagnostics();
+                diag.Report( diag.getCustomDiagID( DiagnosticsEngine::Fatal,
+                    "unknown plugin tool %0 [loplugin]" )) << args.front();
+                }
+            for( Rewriter::buffer_iterator it = rewriter.buffer_begin();
+                 it != rewriter.buffer_end();
+                 ++it )
+                {
+                const FileEntry* e = context.getSourceManager().getFileEntryForID( it->first );
+                string filename = std::string( e->getName()) + ".new";
+                string error;
+                // TODO If there will be actually plugins also modifying headers,
+                // race conditions should be avoided here.
+                raw_fd_ostream ostream( filename.c_str(), error );
+                DiagnosticsEngine& diag = context.getDiagnostics();
+                if( !error.empty())
+                    diag.Report( diag.getCustomDiagID( DiagnosticsEngine::Error,
+                        "cannot write modified source to %0 (%1) [loplugin]" )) << filename << error;
+                else
+                    diag.Report( diag.getCustomDiagID( DiagnosticsEngine::Note,
+                        "modified source %0 [loplugin]" )) << filename;
+                it->second.write( ostream );
+                }
+            }
+    private:
+        bool isArg( const char* arg ) const
+            {
+            return find( args.begin(), args.end(), arg ) != args.end();
+            }
+        Rewriter rewriter;
+        vector< string > args;
+        BodyNotInBlock bodyNotInBlock;
+        LclStaticFix lclStaticFix;
+        SalLogAreas salLogAreas;
+        UnusedVariableCheck unusedVariableCheck;
+    };
+
+/**
+ The Clang plugin class, just forwards to PluginHandler.
+*/
+class LibreOfficeAction
+    : public PluginASTAction
+    {
+    public:
+        virtual ASTConsumer* CreateASTConsumer( CompilerInstance& Compiler, StringRef InFile )
+            {
+            return new PluginHandler( Compiler.getASTContext(), _args );
+            }
+        virtual bool ParseArgs( const CompilerInstance& CI, const vector< string >& args )
+            {
+            _args = args;
+            return true;
+            }
+    private:
+        vector< string > _args;
+    };
+
+} // namespace
+
+static FrontendPluginRegistry::Add< loplugin::LibreOfficeAction > X( "loplugin", "LibreOffice compile check plugin" );