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};
namespace clang {
class ASTContext;
+ class FieldDecl;
class RecordDecl;
/// ASTRecordLayout -
unsigned Alignment; // Alignment of record in bits.
unsigned FieldCount; // Number of fields
friend class ASTContext;
+ friend class ASTRecordLayoutBuilder;
ASTRecordLayout(uint64_t S = 0, unsigned A = 8)
: Size(S), NextOffset(S), Alignment(A), FieldCount(0) {}
delete [] FieldOffsets;
}
+ ASTRecordLayout(uint64_t Size, unsigned Alignment,
+ const uint64_t *fieldoffsets, unsigned fieldcount)
+ : Size(Size), FieldOffsets(0), Alignment(Alignment), FieldCount(fieldcount) {
+ if (FieldCount > 0) {
+ FieldOffsets = new uint64_t[FieldCount];
+ for (unsigned i = 0; i < FieldCount; ++i)
+ FieldOffsets[i] = fieldoffsets[i];
+ }
+ }
+
/// Initialize record layout. N is the number of fields in this record.
void InitializeLayout(unsigned N) {
FieldCount = N;
--- /dev/null
+//=== ASTRecordLayoutBuilder.cpp - Helper class for building record layouts ==//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RecordLayoutBuilder.h"
+
+#include "clang/AST/Attr.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/RecordLayout.h"
+#include "clang/Basic/TargetInfo.h"
+#include <llvm/Support/MathExtras.h>
+
+using namespace clang;
+
+ASTRecordLayoutBuilder::ASTRecordLayoutBuilder(ASTContext &Ctx)
+ : Ctx(Ctx), Size(0), Alignment(8), StructPacking(0), NextOffset(0),
+ IsUnion(false) {}
+
+void ASTRecordLayoutBuilder::Layout(const RecordDecl *D) {
+ IsUnion = D->isUnion();
+
+ if (const PackedAttr* PA = D->getAttr<PackedAttr>())
+ StructPacking = PA->getAlignment();
+
+ if (const AlignedAttr *AA = D->getAttr<AlignedAttr>())
+ UpdateAlignment(AA->getAlignment());
+
+ // Layout each field, for now, just sequentially, respecting alignment. In
+ // the future, this will need to be tweakable by targets.
+ for (RecordDecl::field_iterator Field = D->field_begin(),
+ FieldEnd = D->field_end(); Field != FieldEnd; ++Field)
+ LayoutField(*Field);
+
+ // Finally, round the size of the total struct up to the alignment of the
+ // struct itself.
+ FinishLayout();
+}
+
+void ASTRecordLayoutBuilder::LayoutField(const FieldDecl *D) {
+ unsigned FieldPacking = StructPacking;
+ uint64_t FieldOffset = IsUnion ? 0 : Size;
+ uint64_t FieldSize;
+ unsigned FieldAlign;
+
+ // FIXME: Should this override struct packing? Probably we want to
+ // take the minimum?
+ if (const PackedAttr *PA = D->getAttr<PackedAttr>())
+ FieldPacking = PA->getAlignment();
+
+ if (const Expr *BitWidthExpr = D->getBitWidth()) {
+ // TODO: Need to check this algorithm on other targets!
+ // (tested on Linux-X86)
+ FieldSize = BitWidthExpr->EvaluateAsInt(Ctx).getZExtValue();
+
+ std::pair<uint64_t, unsigned> FieldInfo = Ctx.getTypeInfo(D->getType());
+ uint64_t TypeSize = FieldInfo.first;
+
+ // Determine the alignment of this bitfield. The packing
+ // attributes define a maximum and the alignment attribute defines
+ // a minimum.
+ // FIXME: What is the right behavior when the specified alignment
+ // is smaller than the specified packing?
+ FieldAlign = FieldInfo.second;
+ if (FieldPacking)
+ FieldAlign = std::min(FieldAlign, FieldPacking);
+ if (const AlignedAttr *AA = D->getAttr<AlignedAttr>())
+ FieldAlign = std::max(FieldAlign, AA->getAlignment());
+
+ // Check if we need to add padding to give the field the correct
+ // alignment.
+ if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize)
+ FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1);
+
+ // Padding members don't affect overall alignment
+ if (!D->getIdentifier())
+ FieldAlign = 1;
+ } else {
+ if (D->getType()->isIncompleteArrayType()) {
+ // This is a flexible array member; we can't directly
+ // query getTypeInfo about these, so we figure it out here.
+ // Flexible array members don't have any size, but they
+ // have to be aligned appropriately for their element type.
+ FieldSize = 0;
+ const ArrayType* ATy = Ctx.getAsArrayType(D->getType());
+ FieldAlign = Ctx.getTypeAlign(ATy->getElementType());
+ } else if (const ReferenceType *RT = D->getType()->getAsReferenceType()) {
+ unsigned AS = RT->getPointeeType().getAddressSpace();
+ FieldSize = Ctx.Target.getPointerWidth(AS);
+ FieldAlign = Ctx.Target.getPointerAlign(AS);
+ } else {
+ std::pair<uint64_t, unsigned> FieldInfo = Ctx.getTypeInfo(D->getType());
+ FieldSize = FieldInfo.first;
+ FieldAlign = FieldInfo.second;
+ }
+
+ // Determine the alignment of this bitfield. The packing
+ // attributes define a maximum and the alignment attribute defines
+ // a minimum. Additionally, the packing alignment must be at least
+ // a byte for non-bitfields.
+ //
+ // FIXME: What is the right behavior when the specified alignment
+ // is smaller than the specified packing?
+ if (FieldPacking)
+ FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking));
+ if (const AlignedAttr *AA = D->getAttr<AlignedAttr>())
+ FieldAlign = std::max(FieldAlign, AA->getAlignment());
+
+ // Round up the current record size to the field's alignment boundary.
+ FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1);
+ }
+
+ // Place this field at the current location.
+ FieldOffsets.push_back(FieldOffset);
+
+ // Reserve space for this field.
+ if (IsUnion)
+ Size = std::max(Size, FieldSize);
+ else
+ Size = FieldOffset + FieldSize;
+
+ // Remember the next available offset.
+ NextOffset = Size;
+
+ // Remember max struct/class alignment.
+ UpdateAlignment(FieldAlign);
+}
+
+void ASTRecordLayoutBuilder::FinishLayout() {
+ // In C++, records cannot be of size 0.
+ if (Ctx.getLangOptions().CPlusPlus && Size == 0)
+ Size = 8;
+ // Finally, round the size of the record up to the alignment of the
+ // record itself.
+ Size = (Size + (Alignment-1)) & ~(Alignment-1);
+}
+
+void ASTRecordLayoutBuilder::UpdateAlignment(unsigned NewAlignment) {
+ if (NewAlignment <= Alignment)
+ return;
+
+ assert(llvm::isPowerOf2_32(NewAlignment && "Alignment not a power of 2"));
+
+ Alignment = NewAlignment;
+}
+
+const ASTRecordLayout *
+ASTRecordLayoutBuilder::ComputeLayout(ASTContext &Ctx,
+ const RecordDecl *D) {
+ ASTRecordLayoutBuilder Builder(Ctx);
+
+ Builder.Layout(D);
+
+ return new ASTRecordLayout(Builder.Size, Builder.Alignment,
+ Builder.FieldOffsets.data(),
+ Builder.FieldOffsets.size());
+}
--- /dev/null
+//===- ASTRecordLayoutBuilder.h - Helper class for building record layouts ===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_RECORDLAYOUTBUILDER_H
+#define LLVM_CLANG_AST_RECORDLAYOUTBUILDER_H
+
+#include "llvm/ADT/SmallVector.h"
+
+namespace clang {
+ class ASTContext;
+ class ASTRecordLayout;
+ class FieldDecl;
+ class RecordDecl;
+
+class ASTRecordLayoutBuilder {
+ ASTContext &Ctx;
+
+ uint64_t Size;
+ uint64_t Alignment;
+ llvm::SmallVector<uint64_t, 16> FieldOffsets;
+
+ unsigned StructPacking;
+ unsigned NextOffset;
+ bool IsUnion;
+
+ ASTRecordLayoutBuilder(ASTContext &Ctx);
+
+ void Layout(const RecordDecl *D);
+ void LayoutField(const FieldDecl *D);
+ void FinishLayout();
+
+ void UpdateAlignment(unsigned NewAlignment);
+
+ ASTRecordLayoutBuilder(const ASTRecordLayoutBuilder&); // DO NOT IMPLEMENT
+ void operator=(const ASTRecordLayoutBuilder&); // DO NOT IMPLEMENT
+public:
+ static const ASTRecordLayout *ComputeLayout(ASTContext &Ctx,
+ const RecordDecl *RD);
+
+};
+
+} // end namespace clang
+
+#endif
+
projects / platform / upstream / llvm.git / commitdiff