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Diffstat (limited to 'lib/CodeGen/CGRecordLayoutBuilder.cpp')
-rw-r--r--lib/CodeGen/CGRecordLayoutBuilder.cpp122
1 files changed, 61 insertions, 61 deletions
diff --git a/lib/CodeGen/CGRecordLayoutBuilder.cpp b/lib/CodeGen/CGRecordLayoutBuilder.cpp
index f2fd885ee4..d26c7721da 100644
--- a/lib/CodeGen/CGRecordLayoutBuilder.cpp
+++ b/lib/CodeGen/CGRecordLayoutBuilder.cpp
@@ -37,7 +37,7 @@ void CGRecordLayoutBuilder::Layout(const RecordDecl *D) {
if (LayoutFields(D))
return;
-
+
// We weren't able to layout the struct. Try again with a packed struct
Packed = true;
AlignmentAsLLVMStruct = 1;
@@ -45,52 +45,52 @@ void CGRecordLayoutBuilder::Layout(const RecordDecl *D) {
FieldTypes.clear();
LLVMFields.clear();
LLVMBitFields.clear();
-
+
LayoutFields(D);
}
void CGRecordLayoutBuilder::LayoutBitField(const FieldDecl *D,
uint64_t FieldOffset) {
- uint64_t FieldSize =
+ uint64_t FieldSize =
D->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue();
-
+
if (FieldSize == 0)
return;
uint64_t NextFieldOffset = NextFieldOffsetInBytes * 8;
unsigned NumBytesToAppend;
-
+
if (FieldOffset < NextFieldOffset) {
assert(BitsAvailableInLastField && "Bitfield size mismatch!");
assert(NextFieldOffsetInBytes && "Must have laid out at least one byte!");
-
+
// The bitfield begins in the previous bit-field.
- NumBytesToAppend =
+ NumBytesToAppend =
llvm::RoundUpToAlignment(FieldSize - BitsAvailableInLastField, 8) / 8;
} else {
assert(FieldOffset % 8 == 0 && "Field offset not aligned correctly");
// Append padding if necessary.
AppendBytes((FieldOffset - NextFieldOffset) / 8);
-
- NumBytesToAppend =
+
+ NumBytesToAppend =
llvm::RoundUpToAlignment(FieldSize, 8) / 8;
-
+
assert(NumBytesToAppend && "No bytes to append!");
}
const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(D->getType());
uint64_t TypeSizeInBits = getTypeSizeInBytes(Ty) * 8;
-
+
LLVMBitFields.push_back(LLVMBitFieldInfo(D, FieldOffset / TypeSizeInBits,
- FieldOffset % TypeSizeInBits,
+ FieldOffset % TypeSizeInBits,
FieldSize));
-
+
AppendBytes(NumBytesToAppend);
-
+
AlignmentAsLLVMStruct = std::max(AlignmentAsLLVMStruct, getTypeAlignment(Ty));
- BitsAvailableInLastField =
+ BitsAvailableInLastField =
NextFieldOffsetInBytes * 8 - (FieldOffset + FieldSize);
}
@@ -105,14 +105,14 @@ bool CGRecordLayoutBuilder::LayoutField(const FieldDecl *D,
// don't affect the struct alignment.
if (!Packed && !D->getDeclName())
return false;
-
+
LayoutBitField(D, FieldOffset);
return true;
}
-
+
assert(FieldOffset % 8 == 0 && "FieldOffset is not on a byte boundary!");
uint64_t FieldOffsetInBytes = FieldOffset / 8;
-
+
const llvm::Type *Ty = Types.ConvertTypeForMemRecursive(D->getType());
unsigned TypeAlignment = getTypeAlignment(Ty);
@@ -122,7 +122,7 @@ bool CGRecordLayoutBuilder::LayoutField(const FieldDecl *D,
assert(!Packed && "Alignment is wrong even with packed struct!");
return false;
}
-
+
if (const RecordType *RT = D->getType()->getAs<RecordType>()) {
const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
if (const PragmaPackAttr *PPA = RD->getAttr<PragmaPackAttr>()) {
@@ -132,72 +132,72 @@ bool CGRecordLayoutBuilder::LayoutField(const FieldDecl *D,
}
// Round up the field offset to the alignment of the field type.
- uint64_t AlignedNextFieldOffsetInBytes =
+ uint64_t AlignedNextFieldOffsetInBytes =
llvm::RoundUpToAlignment(NextFieldOffsetInBytes, TypeAlignment);
if (FieldOffsetInBytes < AlignedNextFieldOffsetInBytes) {
assert(!Packed && "Could not place field even with packed struct!");
return false;
}
-
+
if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) {
// Even with alignment, the field offset is not at the right place,
// insert padding.
uint64_t PaddingInBytes = FieldOffsetInBytes - NextFieldOffsetInBytes;
-
+
AppendBytes(PaddingInBytes);
}
-
+
// Now append the field.
LLVMFields.push_back(LLVMFieldInfo(D, FieldTypes.size()));
AppendField(FieldOffsetInBytes, Ty);
-
+
return true;
}
void CGRecordLayoutBuilder::LayoutUnion(const RecordDecl *D) {
assert(D->isUnion() && "Can't call LayoutUnion on a non-union record!");
-
+
const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D);
-
+
const llvm::Type *Ty = 0;
uint64_t Size = 0;
unsigned Align = 0;
-
+
unsigned FieldNo = 0;
- for (RecordDecl::field_iterator Field = D->field_begin(),
+ for (RecordDecl::field_iterator Field = D->field_begin(),
FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) {
- assert(Layout.getFieldOffset(FieldNo) == 0 &&
+ assert(Layout.getFieldOffset(FieldNo) == 0 &&
"Union field offset did not start at the beginning of record!");
if (Field->isBitField()) {
- uint64_t FieldSize =
+ uint64_t FieldSize =
Field->getBitWidth()->EvaluateAsInt(Types.getContext()).getZExtValue();
-
+
// Ignore zero sized bit fields.
if (FieldSize == 0)
continue;
-
+
// Add the bit field info.
Types.addBitFieldInfo(*Field, 0, 0, FieldSize);
} else
Types.addFieldInfo(*Field, 0);
-
- const llvm::Type *FieldTy =
+
+ const llvm::Type *FieldTy =
Types.ConvertTypeForMemRecursive(Field->getType());
unsigned FieldAlign = Types.getTargetData().getABITypeAlignment(FieldTy);
uint64_t FieldSize = Types.getTargetData().getTypeAllocSize(FieldTy);
-
+
if (FieldAlign < Align)
continue;
-
+
if (FieldAlign > Align || FieldSize > Size) {
Ty = FieldTy;
Align = FieldAlign;
Size = FieldSize;
}
}
-
+
// Now add our field.
if (Ty) {
AppendField(0, Ty);
@@ -208,7 +208,7 @@ void CGRecordLayoutBuilder::LayoutUnion(const RecordDecl *D) {
Align = 1;
}
}
-
+
// Append tail padding.
if (Layout.getSize() / 8 > Size)
AppendPadding(Layout.getSize() / 8, Align);
@@ -217,15 +217,15 @@ void CGRecordLayoutBuilder::LayoutUnion(const RecordDecl *D) {
bool CGRecordLayoutBuilder::LayoutFields(const RecordDecl *D) {
assert(!D->isUnion() && "Can't call LayoutFields on a union!");
assert(Alignment && "Did not set alignment!");
-
+
const ASTRecordLayout &Layout = Types.getContext().getASTRecordLayout(D);
-
+
unsigned FieldNo = 0;
- for (RecordDecl::field_iterator Field = D->field_begin(),
+ for (RecordDecl::field_iterator Field = D->field_begin(),
FieldEnd = D->field_end(); Field != FieldEnd; ++Field, ++FieldNo) {
if (!LayoutField(*Field, Layout.getFieldOffset(FieldNo))) {
- assert(!Packed &&
+ assert(!Packed &&
"Could not layout fields even with a packed LLVM struct!");
return false;
}
@@ -233,21 +233,21 @@ bool CGRecordLayoutBuilder::LayoutFields(const RecordDecl *D) {
// Append tail padding if necessary.
AppendTailPadding(Layout.getSize());
-
+
return true;
}
void CGRecordLayoutBuilder::AppendTailPadding(uint64_t RecordSize) {
assert(RecordSize % 8 == 0 && "Invalid record size!");
-
+
uint64_t RecordSizeInBytes = RecordSize / 8;
assert(NextFieldOffsetInBytes <= RecordSizeInBytes && "Size mismatch!");
-
+
unsigned NumPadBytes = RecordSizeInBytes - NextFieldOffsetInBytes;
AppendBytes(NumPadBytes);
}
-void CGRecordLayoutBuilder::AppendField(uint64_t FieldOffsetInBytes,
+void CGRecordLayoutBuilder::AppendField(uint64_t FieldOffsetInBytes,
const llvm::Type *FieldTy) {
AlignmentAsLLVMStruct = std::max(AlignmentAsLLVMStruct,
getTypeAlignment(FieldTy));
@@ -260,19 +260,19 @@ void CGRecordLayoutBuilder::AppendField(uint64_t FieldOffsetInBytes,
BitsAvailableInLastField = 0;
}
-void
+void
CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes,
const llvm::Type *FieldTy) {
AppendPadding(FieldOffsetInBytes, getTypeAlignment(FieldTy));
}
-void CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes,
+void CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes,
unsigned FieldAlignment) {
assert(NextFieldOffsetInBytes <= FieldOffsetInBytes &&
"Incorrect field layout!");
-
+
// Round up the field offset to the alignment of the field type.
- uint64_t AlignedNextFieldOffsetInBytes =
+ uint64_t AlignedNextFieldOffsetInBytes =
llvm::RoundUpToAlignment(NextFieldOffsetInBytes, FieldAlignment);
if (AlignedNextFieldOffsetInBytes < FieldOffsetInBytes) {
@@ -287,11 +287,11 @@ void CGRecordLayoutBuilder::AppendPadding(uint64_t FieldOffsetInBytes,
void CGRecordLayoutBuilder::AppendBytes(uint64_t NumBytes) {
if (NumBytes == 0)
return;
-
+
const llvm::Type *Ty = llvm::Type::getInt8Ty(Types.getLLVMContext());
if (NumBytes > 1)
Ty = llvm::ArrayType::get(Ty, NumBytes);
-
+
// Append the padding field
AppendField(NextFieldOffsetInBytes, Ty);
}
@@ -299,7 +299,7 @@ void CGRecordLayoutBuilder::AppendBytes(uint64_t NumBytes) {
unsigned CGRecordLayoutBuilder::getTypeAlignment(const llvm::Type *Ty) const {
if (Packed)
return 1;
-
+
return Types.getTargetData().getABITypeAlignment(Ty);
}
@@ -311,26 +311,26 @@ void CGRecordLayoutBuilder::CheckForMemberPointer(const FieldDecl *FD) {
// This record already contains a member pointer.
if (ContainsMemberPointer)
return;
-
+
// Can only have member pointers if we're compiling C++.
if (!Types.getContext().getLangOptions().CPlusPlus)
return;
-
+
QualType Ty = FD->getType();
-
+
if (Ty->isMemberPointerType()) {
// We have a member pointer!
ContainsMemberPointer = true;
return;
}
-
+
}
CGRecordLayout *
CGRecordLayoutBuilder::ComputeLayout(CodeGenTypes &Types,
const RecordDecl *D) {
CGRecordLayoutBuilder Builder(Types);
-
+
Builder.Layout(D);
const llvm::Type *Ty = llvm::StructType::get(Types.getLLVMContext(),
@@ -339,7 +339,7 @@ CGRecordLayoutBuilder::ComputeLayout(CodeGenTypes &Types,
assert(Types.getContext().getASTRecordLayout(D).getSize() / 8 ==
Types.getTargetData().getTypeAllocSize(Ty) &&
"Type size mismatch!");
-
+
// Add all the field numbers.
for (unsigned i = 0, e = Builder.LLVMFields.size(); i != e; ++i) {
const FieldDecl *FD = Builder.LLVMFields[i].first;
@@ -351,9 +351,9 @@ CGRecordLayoutBuilder::ComputeLayout(CodeGenTypes &Types,
// Add bitfield info.
for (unsigned i = 0, e = Builder.LLVMBitFields.size(); i != e; ++i) {
const LLVMBitFieldInfo &Info = Builder.LLVMBitFields[i];
-
+
Types.addBitFieldInfo(Info.FD, Info.FieldNo, Info.Start, Info.Size);
}
-
+
return new CGRecordLayout(Ty, Builder.ContainsMemberPointer);
}