[llvm-pdbdump] Only build the TypeDatabase if necessary.

Building the type database is expensive, and can take multiple
minutes for large PDBs.  But we only need it in certain cases
depending on what command line options are specified.  So only
build it when we know we're about to need it.

llvm-svn: 302204

2 files changed, 77 insertions, 41 deletions

diff --git a/llvm/tools/llvm-pdbdump/LLVMOutputStyle.cpp b/llvm/tools/llvm-pdbdump/LLVMOutputStyle.cpp
index ec1325ff233..06d8ced128a 100644
--- a/llvm/tools/llvm-pdbdump/LLVMOutputStyle.cpp
+++ b/llvm/tools/llvm-pdbdump/LLVMOutputStyle.cpp
@@ -609,11 +609,8 @@ Error LLVMOutputStyle::dumpTpiStream(uint32_t StreamIdx) {
     VerLabel = "IPI Version";
   }
 
-  bool IsSilentDatabaseBuild = !DumpRecordBytes && !DumpRecords && !DumpTpiHash;
-  if (IsSilentDatabaseBuild) {
-    outs().flush();
-    errs() << "Building Type Information For " << Label << "\n";
-  }
+  if (!DumpRecordBytes && !DumpRecords && !DumpTpiHash)
+    return Error::success();
 
   auto Tpi = (StreamIdx == StreamTPI) ? File.getPDBTpiStream()
                                       : File.getPDBIpiStream();
@@ -623,38 +620,43 @@ Error LLVMOutputStyle::dumpTpiStream(uint32_t StreamIdx) {
   std::unique_ptr<DictScope> StreamScope;
   std::unique_ptr<ListScope> RecordScope;
 
-  if (!IsSilentDatabaseBuild) {
-    StreamScope = llvm::make_unique<DictScope>(P, Label);
-    P.printNumber(VerLabel, Tpi->getTpiVersion());
-    P.printNumber("Record count", Tpi->NumTypeRecords());
-  }
-
-  TypeDatabase &StreamDB = (StreamIdx == StreamTPI) ? TypeDB : ItemDB;
+  StreamScope = llvm::make_unique<DictScope>(P, Label);
+  P.printNumber(VerLabel, Tpi->getTpiVersion());
+  P.printNumber("Record count", Tpi->NumTypeRecords());
 
-  TypeDatabaseVisitor DBV(StreamDB);
-  CompactTypeDumpVisitor CTDV(StreamDB, &P);
-  TypeDumpVisitor TDV(TypeDB, &P, false);
-  if (StreamIdx == StreamIPI)
-    TDV.setItemDB(ItemDB);
-  RecordBytesVisitor RBV(P);
-  TypeDeserializer Deserializer;
+  Optional<TypeDatabase> &StreamDB = (StreamIdx == StreamTPI) ? TypeDB : ItemDB;
 
-  // We always need to deserialize and add it to the type database.  This is
-  // true if even if we're not dumping anything, because we could need the
-  // type database for the purposes of dumping symbols.
-  TypeVisitorCallbackPipeline Pipeline;
-  Pipeline.addCallbackToPipeline(Deserializer);
-  Pipeline.addCallbackToPipeline(DBV);
+  std::vector<std::unique_ptr<TypeVisitorCallbacks>> Visitors;
 
+  Visitors.push_back(make_unique<TypeDeserializer>());
+  if (!StreamDB.hasValue()) {
+    StreamDB.emplace();
+    Visitors.push_back(make_unique<TypeDatabaseVisitor>(*StreamDB));
+  }
   // If we're in dump mode, add a dumper with the appropriate detail level.
   if (DumpRecords) {
+    std::unique_ptr<TypeVisitorCallbacks> Dumper;
     if (opts::raw::CompactRecords)
-      Pipeline.addCallbackToPipeline(CTDV);
-    else
-      Pipeline.addCallbackToPipeline(TDV);
+      Dumper = make_unique<CompactTypeDumpVisitor>(*StreamDB, &P);
+    else {
+      assert(TypeDB.hasValue());
+
+      auto X = make_unique<TypeDumpVisitor>(*TypeDB, &P, false);
+      if (StreamIdx == StreamIPI)
+        X->setItemDB(*ItemDB);
+      Dumper = std::move(X);
+    }
+    Visitors.push_back(std::move(Dumper));
   }
   if (DumpRecordBytes)
-    Pipeline.addCallbackToPipeline(RBV);
+    Visitors.push_back(make_unique<RecordBytesVisitor>(P));
+
+  // We always need to deserialize and add it to the type database.  This is
+  // true if even if we're not dumping anything, because we could need the
+  // type database for the purposes of dumping symbols.
+  TypeVisitorCallbackPipeline Pipeline;
+  for (const auto &V : Visitors)
+    Pipeline.addCallbackToPipeline(*V);
 
   CVTypeVisitor Visitor(Pipeline);
 
@@ -700,19 +702,42 @@ Error LLVMOutputStyle::dumpTpiStream(uint32_t StreamIdx) {
     }
   }
 
-  if (!IsSilentDatabaseBuild) {
-    ListScope L(P, "TypeIndexOffsets");
-    for (const auto &IO : Tpi->getTypeIndexOffsets()) {
-      P.printString(formatv("Index: {0:x}, Offset: {1:N}", IO.Type.getIndex(),
-                            (uint32_t)IO.Offset)
-                        .str());
-    }
+  ListScope L(P, "TypeIndexOffsets");
+  for (const auto &IO : Tpi->getTypeIndexOffsets()) {
+    P.printString(formatv("Index: {0:x}, Offset: {1:N}", IO.Type.getIndex(),
+                          (uint32_t)IO.Offset)
+                      .str());
   }
 
   P.flush();
   return Error::success();
 }
 
+Error LLVMOutputStyle::buildTypeDatabase(uint32_t SN) {
+  assert(SN == StreamIPI || SN == StreamTPI);
+
+  auto &DB = (SN == StreamIPI) ? ItemDB : TypeDB;
+
+  if (DB.hasValue())
+    return Error::success();
+
+  DB.emplace();
+
+  TypeVisitorCallbackPipeline Pipeline;
+  TypeDeserializer Deserializer;
+  TypeDatabaseVisitor DBV(*DB);
+  Pipeline.addCallbackToPipeline(Deserializer);
+  Pipeline.addCallbackToPipeline(DBV);
+
+  auto Tpi =
+      (SN == StreamTPI) ? File.getPDBTpiStream() : File.getPDBIpiStream();
+  if (!Tpi)
+    return Tpi.takeError();
+
+  CVTypeVisitor Visitor(Pipeline);
+  return Visitor.visitTypeStream(Tpi->types(nullptr));
+}
+
 Error LLVMOutputStyle::dumpDbiStream() {
   bool DumpModules = opts::raw::DumpModules || opts::raw::DumpModuleSyms ||
                      opts::raw::DumpModuleFiles || opts::raw::DumpLineInfo;
@@ -785,8 +810,11 @@ Error LLVMOutputStyle::dumpDbiStream() {
           return EC;
 
         if (ShouldDumpSymbols) {
+          if (auto EC = buildTypeDatabase(StreamTPI))
+            return EC;
+
           ListScope SS(P, "Symbols");
-          codeview::CVSymbolDumper SD(P, TypeDB, nullptr, false);
+          codeview::CVSymbolDumper SD(P, *TypeDB, nullptr, false);
           bool HadError = false;
           for (auto S : ModS.symbols(&HadError)) {
             DictScope LL(P, "");
@@ -807,8 +835,10 @@ Error LLVMOutputStyle::dumpDbiStream() {
         }
         if (opts::raw::DumpLineInfo) {
           ListScope SS(P, "LineInfo");
+          if (auto EC = buildTypeDatabase(StreamIPI))
+            return EC;
 
-          C13RawVisitor V(P, File, ItemDB);
+          C13RawVisitor V(P, File, *ItemDB);
           if (auto EC = codeview::visitModuleDebugFragments(
                   ModS.linesAndChecksums(), V))
             return EC;
@@ -925,7 +955,10 @@ Error LLVMOutputStyle::dumpPublicsStream() {
   P.printList("Section Offsets", Publics->getSectionOffsets(),
               printSectionOffset);
   ListScope L(P, "Symbols");
-  codeview::CVSymbolDumper SD(P, TypeDB, nullptr, false);
+  if (auto EC = buildTypeDatabase(StreamTPI))
+    return EC;
+
+  codeview::CVSymbolDumper SD(P, *TypeDB, nullptr, false);
   bool HadError = false;
   for (auto S : Publics->getSymbols(&HadError)) {
     DictScope DD(P, "");
diff --git a/llvm/tools/llvm-pdbdump/LLVMOutputStyle.h b/llvm/tools/llvm-pdbdump/LLVMOutputStyle.h
index bfff3b8308d..b0e7e3406b3 100644
--- a/llvm/tools/llvm-pdbdump/LLVMOutputStyle.h
+++ b/llvm/tools/llvm-pdbdump/LLVMOutputStyle.h
@@ -12,6 +12,7 @@
 
 #include "OutputStyle.h"
 
+#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/DebugInfo/CodeView/TypeDatabase.h"
 #include "llvm/Support/ScopedPrinter.h"
@@ -28,6 +29,8 @@ public:
   Error dump() override;
 
 private:
+  Error buildTypeDatabase(uint32_t SN);
+
   Error dumpFileHeaders();
   Error dumpStreamSummary();
   Error dumpFreePageMap();
@@ -51,8 +54,8 @@ private:
 
   PDBFile &File;
   ScopedPrinter P;
-  codeview::TypeDatabase TypeDB;
-  codeview::TypeDatabase ItemDB;
+  Optional<codeview::TypeDatabase> TypeDB;
+  Optional<codeview::TypeDatabase> ItemDB;
   SmallVector<std::string, 32> StreamPurposes;
 };
 }