Introduce a testbed for merging multiple ASTs into a single AST
context with the AST importer. WIP, still useless but at least it has
a test.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95683 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/ASTMerge.cpp b/lib/Frontend/ASTMerge.cpp
new file mode 100644
index 0000000..649af9e
--- /dev/null
+++ b/lib/Frontend/ASTMerge.cpp
@@ -0,0 +1,98 @@
+//===-- ASTMerge.cpp - AST Merging Frontent Action --------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ASTImporter.h"
+
+using namespace clang;
+
+ASTConsumer *ASTMergeAction::CreateASTConsumer(CompilerInstance &CI,
+ llvm::StringRef InFile) {
+ return AdaptedAction->CreateASTConsumer(CI, InFile);
+}
+
+bool ASTMergeAction::BeginSourceFileAction(CompilerInstance &CI,
+ llvm::StringRef Filename) {
+ // FIXME: This is a hack. We need a better way to communicate the
+ // AST file, compiler instance, and file name than member variables
+ // of FrontendAction.
+ AdaptedAction->setCurrentFile(getCurrentFile(), takeCurrentASTUnit());
+ AdaptedAction->setCompilerInstance(&CI);
+ return AdaptedAction->BeginSourceFileAction(CI, Filename);
+}
+
+void ASTMergeAction::ExecuteAction() {
+ CompilerInstance &CI = getCompilerInstance();
+
+ for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
+ ASTUnit *Unit = ASTUnit::LoadFromPCHFile(ASTFiles[I], CI.getDiagnostics(),
+ false, true);
+ if (!Unit)
+ continue;
+
+ ASTImporter Importer(CI.getASTContext(), CI.getDiagnostics(),
+ Unit->getASTContext(), CI.getDiagnostics());
+
+ TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
+ for (DeclContext::decl_iterator D = TU->decls_begin(),
+ DEnd = TU->decls_end();
+ D != DEnd; ++D) {
+ // FIXME: We only merge variables whose names start with x. Why
+ // would anyone want anything else?
+ if (VarDecl *VD = dyn_cast<VarDecl>(*D))
+ if (VD->getIdentifier() &&
+ *VD->getIdentifier()->getNameStart() == 'x') {
+ Decl *Merged = Importer.Import(VD);
+ if (Merged)
+ Merged->dump();
+ }
+ }
+
+ delete Unit;
+ }
+
+
+ return AdaptedAction->ExecuteAction();
+}
+
+void ASTMergeAction::EndSourceFileAction() {
+ return AdaptedAction->EndSourceFileAction();
+}
+
+ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
+ std::string *ASTFiles, unsigned NumASTFiles)
+ : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles, ASTFiles + NumASTFiles) {
+ assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
+}
+
+ASTMergeAction::~ASTMergeAction() {
+ delete AdaptedAction;
+}
+
+bool ASTMergeAction::usesPreprocessorOnly() const {
+ return AdaptedAction->usesPreprocessorOnly();
+}
+
+bool ASTMergeAction::usesCompleteTranslationUnit() {
+ return AdaptedAction->usesCompleteTranslationUnit();
+}
+
+bool ASTMergeAction::hasPCHSupport() const {
+ return AdaptedAction->hasPCHSupport();
+}
+
+bool ASTMergeAction::hasASTSupport() const {
+ return AdaptedAction->hasASTSupport();
+}
+
+bool ASTMergeAction::hasCodeCompletionSupport() const {
+ return AdaptedAction->hasCodeCompletionSupport();
+}
diff --git a/lib/Frontend/CMakeLists.txt b/lib/Frontend/CMakeLists.txt
index 58aaa43..1d0b5c1 100644
--- a/lib/Frontend/CMakeLists.txt
+++ b/lib/Frontend/CMakeLists.txt
@@ -2,6 +2,7 @@
add_clang_library(clangFrontend
ASTConsumers.cpp
+ ASTMerge.cpp
ASTUnit.cpp
AnalysisConsumer.cpp
Backend.cpp
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 5b64c7e..006f3c0 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -367,6 +367,10 @@
Res.push_back("-load");
Res.push_back(Opts.Plugins[i]);
}
+ for (unsigned i = 0, e = Opts.ASTMergeFiles.size(); i != e; ++i) {
+ Res.push_back("-ast-merge");
+ Res.push_back(Opts.ASTMergeFiles[i]);
+ }
}
static void HeaderSearchOptsToArgs(const HeaderSearchOptions &Opts,
@@ -929,6 +933,7 @@
Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
Opts.ShowVersion = Args.hasArg(OPT_version);
Opts.ViewClassInheritance = getLastArgValue(Args, OPT_cxx_inheritance_view);
+ Opts.ASTMergeFiles = getAllArgValues(Args, OPT_ast_merge);
FrontendOptions::InputKind DashX = FrontendOptions::IK_None;
if (const Arg *A = Args.getLastArg(OPT_x)) {