[codeview] Try to handle errors better in record iterator

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269381 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/DebugInfo/CodeView/CVTypeVisitor.h

@@ -78,7 +78,7 @@ public:
 
   /// Visits the type records in Data. Sets the error flag on parse failures.
   void visitTypeStream(ArrayRef<uint8_t> Data) {
-    for (const auto &I : makeTypeRange(Data)) {
+    for (const auto &I : makeTypeRange(Data, &HadError)) {
       visitTypeRecord(I);
       if (hadError())
         break;

include/llvm/DebugInfo/CodeView/RecordIterator.h

@@ -31,12 +31,12 @@ public:
     ArrayRef<uint8_t> Data;
   };
 
-  explicit RecordIterator(const ArrayRef<uint8_t> &RecordBytes)
-      : Data(RecordBytes), AtEnd(false) {
+  explicit RecordIterator(const ArrayRef<uint8_t> &RecordBytes, bool *HadError)
+      : HadError(HadError), Data(RecordBytes), AtEnd(false) {
     next(); // Prime the pump
   }
 
-  RecordIterator() : AtEnd(true) {}
+  RecordIterator() : HadError(nullptr), AtEnd(true) {}
 
   // For iterators to compare equal, they must both point at the same record
   // in the same data stream, or they must both be at the end of a stream.
@@ -82,13 +82,16 @@ private:
 
     // FIXME: Use consumeObject when it deals in ArrayRef<uint8_t>.
     if (Data.size() < sizeof(RecordPrefix))
-      return;
+      return parseError();
     const auto *Rec = reinterpret_cast<const RecordPrefix *>(Data.data());
     Data = Data.drop_front(sizeof(RecordPrefix));
 
     Current.Length = Rec->RecordLen;
     Current.Type = static_cast<Kind>(uint16_t(Rec->RecordKind));
-    Current.Data = Data.slice(0, Current.Length - 2);
+    size_t RecLen = Current.Length - 2;
+    if (RecLen > Data.size())
+      return parseError();
+    Current.Data = Data.slice(0, RecLen);
 
     // The next record starts immediately after this one.
     Data = Data.drop_front(Current.Data.size());
@@ -100,6 +103,12 @@ private:
     return;
   }
 
+  void parseError() {
+    if (HadError)
+      *HadError = true;
+  }
+
+  bool *HadError;
   ArrayRef<uint8_t> Data;
   Record Current;
   bool AtEnd;
@@ -107,8 +116,8 @@ private:
 
 template <typename Kind>
 inline iterator_range<RecordIterator<Kind>>
-makeRecordRange(ArrayRef<uint8_t> Data) {
-  return make_range(RecordIterator<Kind>(Data), RecordIterator<Kind>());
+makeRecordRange(ArrayRef<uint8_t> Data, bool *HadError) {
+  return make_range(RecordIterator<Kind>(Data, HadError), RecordIterator<Kind>());
 }
 }
 }

include/llvm/DebugInfo/CodeView/SymbolRecord.h

@@ -329,7 +329,7 @@ struct ThreadLocalDataSym {
 typedef RecordIterator<SymbolRecordKind> SymbolIterator;
 
 inline iterator_range<SymbolIterator> makeSymbolRange(ArrayRef<uint8_t> Data) {
-  return make_range(SymbolIterator(Data), SymbolIterator());
+  return make_range(SymbolIterator(Data, nullptr), SymbolIterator());
 }
 
 } // namespace codeview

include/llvm/DebugInfo/CodeView/TypeStream.h

@@ -27,8 +27,8 @@ namespace codeview {
 
 typedef RecordIterator<TypeLeafKind> TypeIterator;
 
-inline iterator_range<TypeIterator> makeTypeRange(ArrayRef<uint8_t> Data) {
-  return make_range(TypeIterator(Data), TypeIterator());
+inline iterator_range<TypeIterator> makeTypeRange(ArrayRef<uint8_t> Data, bool *HadError) {
+  return make_range(TypeIterator(Data, HadError), TypeIterator());
 }
 
 } // end namespace codeview

include/llvm/DebugInfo/PDB/Raw/TpiStream.h

@@ -38,7 +38,7 @@ public:
   uint32_t TypeIndexEnd() const;
   uint32_t NumTypeRecords() const;
 
-  iterator_range<codeview::TypeIterator> types() const;
+  iterator_range<codeview::TypeIterator> types(bool *HadError) const;
 
 private:
   PDBFile &Pdb;

lib/DebugInfo/PDB/Raw/TpiStream.cpp

@@ -129,6 +129,6 @@ uint32_t TpiStream::NumTypeRecords() const {
   return TypeIndexEnd() - TypeIndexBegin();
 }
 
-iterator_range<codeview::TypeIterator> TpiStream::types() const {
-  return codeview::makeTypeRange(RecordsBuffer.data());
+iterator_range<codeview::TypeIterator> TpiStream::types(bool *HadError) const {
+  return codeview::makeTypeRange(RecordsBuffer.data(), /*HadError=*/HadError);
 }

tools/llvm-pdbdump/llvm-pdbdump.cpp

@@ -44,6 +44,7 @@
 #include "llvm/DebugInfo/PDB/Raw/ModStream.h"
 #include "llvm/DebugInfo/PDB/Raw/NameHashTable.h"
 #include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
+#include "llvm/DebugInfo/PDB/Raw/RawError.h"
 #include "llvm/DebugInfo/PDB/Raw/RawSession.h"
 #include "llvm/DebugInfo/PDB/Raw/StreamReader.h"
 #include "llvm/DebugInfo/PDB/Raw/TpiStream.h"
@@ -376,7 +377,8 @@ static Error dumpTpiStream(ScopedPrinter &P, PDBFile &File) {
     ListScope L(P, "Records");
     codeview::CVTypeDumper TD(P, false);
 
-    for (auto &Type : Tpi.types()) {
+    bool HadError = false;
+    for (auto &Type : Tpi.types(&HadError)) {
       DictScope DD(P, "");
 
       if (opts::DumpTpiRecords)
@@ -385,6 +387,9 @@ static Error dumpTpiStream(ScopedPrinter &P, PDBFile &File) {
       if (opts::DumpTpiRecordBytes)
         P.printBinaryBlock("Bytes", Type.Data);
     }
+    if (HadError)
+      return make_error<RawError>(raw_error_code::corrupt_file,
+                                  "TPI stream contained corrupt record");
   }
   return Error::success();
 }