Use an OwningPtr for the preamble buffer in ASTUnit. This plugs a leak

where we failed to free this buffer along one of the paths, and
detangles the code a little.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119379 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index 5c7b770a355cee30f2493da29a1a7b749b8a2f6f..80ce5220b62cc2f3c7bc1da9bbfca2904e1b15c1 100644 (file)
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -830,7 +830,6 @@ error:
   if (OverrideMainBuffer) {
     PreprocessorOpts.eraseRemappedFile(
                                PreprocessorOpts.remapped_file_buffer_end() - 1);
-    PreprocessorOpts.DisablePCHValidation = true;
     PreprocessorOpts.ImplicitPCHInclude = PriorImplicitPCHInclude;
     delete OverrideMainBuffer;
     SavedMainFileBuffer = 0;
@@ -953,7 +952,6 @@ ASTUnit::ComputePreamble(CompilerInvocation &Invocation,
 }
 
 static llvm::MemoryBuffer *CreatePaddedMainFileBuffer(llvm::MemoryBuffer *Old,
-                                                      bool DeleteOld,
                                                       unsigned NewSize,
                                                       llvm::StringRef NewName) {
   llvm::MemoryBuffer *Result
@@ -964,9 +962,6 @@ static llvm::MemoryBuffer *CreatePaddedMainFileBuffer(llvm::MemoryBuffer *Old,
          ' ', NewSize - Old->getBufferSize() - 1);
   const_cast<char*>(Result->getBufferEnd())[-1] = '\n';  
   
-  if (DeleteOld)
-    delete Old;
-  
   return Result;
 }
 
@@ -1002,6 +997,11 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
   std::pair<llvm::MemoryBuffer *, std::pair<unsigned, bool> > NewPreamble 
     = ComputePreamble(PreambleInvocation, MaxLines, CreatedPreambleBuffer);
 
+  // If ComputePreamble() Take ownership of the
+  llvm::OwningPtr<llvm::MemoryBuffer> OwnedPreambleBuffer;
+  if (CreatedPreambleBuffer)
+    OwnedPreambleBuffer.reset(NewPreamble.first);
+
   if (!NewPreamble.second.first) {
     // We couldn't find a preamble in the main source. Clear out the current
     // preamble, if we have one. It's obviously no good any more.
@@ -1010,8 +1010,6 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
       llvm::sys::Path(PreambleFile).eraseFromDisk();
       PreambleFile.clear();
     }
-    if (CreatedPreambleBuffer)
-      delete NewPreamble.first;
 
     // The next time we actually see a preamble, precompile it.
     PreambleRebuildCounter = 1;
@@ -1108,7 +1106,6 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
         // Create a version of the main file buffer that is padded to
         // buffer size we reserved when creating the preamble.
         return CreatePaddedMainFileBuffer(NewPreamble.first, 
-                                          CreatedPreambleBuffer,
                                           PreambleReservedSize,
                                           FrontendOpts.Inputs[0].second);
       }
@@ -1203,8 +1200,6 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
   if (!Clang.hasTarget()) {
     llvm::sys::Path(FrontendOpts.OutputFile).eraseFromDisk();
     Preamble.clear();
-    if (CreatedPreambleBuffer)
-      delete NewPreamble.first;
     PreambleRebuildCounter = DefaultPreambleRebuildInterval;
     PreprocessorOpts.eraseRemappedFile(
                                PreprocessorOpts.remapped_file_buffer_end() - 1);
@@ -1248,8 +1243,6 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
     Clang.takeInvocation();
     llvm::sys::Path(FrontendOpts.OutputFile).eraseFromDisk();
     Preamble.clear();
-    if (CreatedPreambleBuffer)
-      delete NewPreamble.first;
     PreambleRebuildCounter = DefaultPreambleRebuildInterval;
     PreprocessorOpts.eraseRemappedFile(
                                PreprocessorOpts.remapped_file_buffer_end() - 1);
@@ -1266,8 +1259,6 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
     // FIXME: Should we leave a note for ourselves to try again?
     llvm::sys::Path(FrontendOpts.OutputFile).eraseFromDisk();
     Preamble.clear();
-    if (CreatedPreambleBuffer)
-      delete NewPreamble.first;
     TopLevelDeclsInPreamble.clear();
     PreambleRebuildCounter = DefaultPreambleRebuildInterval;
     PreprocessorOpts.eraseRemappedFile(
@@ -1302,7 +1293,6 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
   PreprocessorOpts.eraseRemappedFile(
                                PreprocessorOpts.remapped_file_buffer_end() - 1);
   return CreatePaddedMainFileBuffer(NewPreamble.first, 
-                                    CreatedPreambleBuffer,
                                     PreambleReservedSize,
                                     FrontendOpts.Inputs[0].second);
 }