Allocate ASTRecordLayout objects using the allocator associated with ASTContext.

This allows them to be allocated using a BumpPtrAllocated
in the common case.

llvm-svn: 97978

1 files changed, 69 insertions, 0 deletions

diff --git a/clang/lib/AST/RecordLayout.cpp b/clang/lib/AST/RecordLayout.cpp
new file mode 100644
index 00000000000..9f8bdec94ee
--- /dev/null
+++ b/clang/lib/AST/RecordLayout.cpp
@@ -0,0 +1,69 @@
+//===-- RecordLayout.cpp - Layout information for a struct/union -*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the RecordLayout interface.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/RecordLayout.h"
+
+using namespace clang;
+
+void ASTRecordLayout::Destroy(ASTContext &Ctx) {
+  if (FieldOffsets)
+    Ctx.Deallocate(FieldOffsets);
+  if (CXXInfo)
+    Ctx.Deallocate(CXXInfo);
+  this->~ASTRecordLayout();
+  Ctx.Deallocate(this);
+}
+
+ASTRecordLayout::ASTRecordLayout(ASTContext &Ctx, uint64_t size, unsigned alignment,
+                unsigned datasize, const uint64_t *fieldoffsets,
+                unsigned fieldcount)
+  : Size(size), DataSize(datasize), FieldOffsets(0), Alignment(alignment),
+    FieldCount(fieldcount), CXXInfo(0) {
+  if (FieldCount > 0)  {
+    FieldOffsets = new (Ctx) uint64_t[FieldCount];
+    for (unsigned i = 0; i < FieldCount; ++i)
+      FieldOffsets[i] = fieldoffsets[i];
+  }
+}
+
+// Constructor for C++ records.
+ASTRecordLayout::ASTRecordLayout(ASTContext &Ctx,
+                       uint64_t size, unsigned alignment,
+                       uint64_t datasize,
+                       const uint64_t *fieldoffsets,
+                       unsigned fieldcount,
+                       uint64_t nonvirtualsize,
+                       unsigned nonvirtualalign,
+                       const PrimaryBaseInfo &PrimaryBase,
+                       const std::pair<const CXXRecordDecl *, uint64_t> *bases,
+                       unsigned numbases,
+                       const std::pair<const CXXRecordDecl *, uint64_t> *vbases,
+                       unsigned numvbases)
+  : Size(size), DataSize(datasize), FieldOffsets(0), Alignment(alignment),
+    FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
+{
+  if (FieldCount > 0)  {
+    FieldOffsets = new (Ctx) uint64_t[FieldCount];
+    for (unsigned i = 0; i < FieldCount; ++i)
+      FieldOffsets[i] = fieldoffsets[i];
+  }
+
+  CXXInfo->PrimaryBase = PrimaryBase;
+  CXXInfo->NonVirtualSize = nonvirtualsize;
+  CXXInfo->NonVirtualAlign = nonvirtualalign;
+  for (unsigned i = 0; i != numbases; ++i)
+    CXXInfo->BaseOffsets[bases[i].first] = bases[i].second;
+  for (unsigned i = 0; i != numvbases; ++i)
+    CXXInfo->VBaseOffsets[vbases[i].first] = vbases[i].second;
+}