Introduce a new libclang parsing flag,
CXTranslationUnit_NestedMacroInstantiations, which indicates whether
we want to see "nested" macro instantiations (e.g., those that occur
inside other macro instantiations) within the detailed preprocessing
record. Many clients (e.g., those that only care about visible tokens)
don't care about this information, and in code that uses preprocessor
metaprogramming, this information can have a very high cost.
Addresses <rdar://problem/9389320>.
llvm-svn: 130990
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 0d0fecd..8827116 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -102,6 +102,7 @@
ConcurrencyCheckValue(CheckUnlocked),
PreambleRebuildCounter(0), SavedMainFileBuffer(0), PreambleBuffer(0),
ShouldCacheCodeCompletionResults(false),
+ NestedMacroInstantiations(true),
CompletionCacheTopLevelHashValue(0),
PreambleTopLevelHashValue(0),
CurrentTopLevelHashValue(0),
@@ -927,6 +928,8 @@
// If the main file has been overridden due to the use of a preamble,
// make that override happen and introduce the preamble.
PreprocessorOptions &PreprocessorOpts = Clang->getPreprocessorOpts();
+ PreprocessorOpts.DetailedRecordIncludesNestedMacroInstantiations
+ = NestedMacroInstantiations;
std::string PriorImplicitPCHInclude;
if (OverrideMainBuffer) {
PreprocessorOpts.addRemappedFile(OriginalSourceFile, OverrideMainBuffer);
@@ -1712,7 +1715,8 @@
bool CaptureDiagnostics,
bool PrecompilePreamble,
bool CompleteTranslationUnit,
- bool CacheCodeCompletionResults) {
+ bool CacheCodeCompletionResults,
+ bool NestedMacroInstantiations) {
// Create the AST unit.
llvm::OwningPtr<ASTUnit> AST;
AST.reset(new ASTUnit(false));
@@ -1723,6 +1727,7 @@
AST->CompleteTranslationUnit = CompleteTranslationUnit;
AST->ShouldCacheCodeCompletionResults = CacheCodeCompletionResults;
AST->Invocation = CI;
+ AST->NestedMacroInstantiations = NestedMacroInstantiations;
// Recover resources if we crash before exiting this method.
llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
@@ -1747,7 +1752,8 @@
bool CompleteTranslationUnit,
bool CacheCodeCompletionResults,
bool CXXPrecompilePreamble,
- bool CXXChainedPCH) {
+ bool CXXChainedPCH,
+ bool NestedMacroInstantiations) {
if (!Diags.getPtr()) {
// No diagnostics engine was provided, so create our own diagnostics object
// with the default options.
@@ -1814,6 +1820,7 @@
AST->NumStoredDiagnosticsInPreamble = StoredDiagnostics.size();
AST->StoredDiagnostics.swap(StoredDiagnostics);
AST->Invocation = CI;
+ AST->NestedMacroInstantiations = NestedMacroInstantiations;
// Recover resources if we crash before exiting this method.
llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
@@ -2265,6 +2272,9 @@
PreprocessorOpts.PrecompiledPreambleBytes.second = false;
}
+ // Disable the preprocessing record
+ PreprocessorOpts.DetailedRecord = false;
+
llvm::OwningPtr<SyntaxOnlyAction> Act;
Act.reset(new SyntaxOnlyAction);
if (Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0].second,