bool
ValueLocation::SetToByteOffset(const ValueLocation& other, uint64 byteOffset,
uint64 byteSize)
{
Clear();
fBigEndian = other.fBigEndian;
ValuePieceLocation piece = other.PieceAt(0);
piece.SetToMemory(piece.address + byteOffset);
piece.SetSize(byteSize);
return AddPiece(piece);
}
status_t
BListValueNode::BListItemCountNodeChild::ResolveLocation(
ValueLoader* valueLoader, ValueLocation*& _location)
{
ValueLocation* location = new(std::nothrow) ValueLocation();
if (location == NULL)
return B_NO_MEMORY;
ValuePieceLocation piece;
piece.SetToMemory(fLocation.ToUInt64());
piece.SetSize(sizeof(int32));
location->AddPiece(piece);
_location = location;
return B_OK;
}
status_t
DwarfType::ResolveObjectDataLocation(target_addr_t objectAddress,
ValueLocation*& _location)
{
ValuePieceLocation piece;
piece.SetToMemory(objectAddress);
piece.SetSize(0);
// We set the piece size to 0 as an indicator that the size has to be
// set.
// TODO: We could set the byte size from type, but that may not be
// accurate. We may want to add bit offset and size to Type.
ValueLocation location(fTypeContext->GetArchitecture()->IsBigEndian());
if (!location.AddPiece(piece))
return B_NO_MEMORY;
return ResolveObjectDataLocation(location, _location);
}
status_t
DwarfType::ResolveObjectDataLocation(const ValueLocation& objectLocation,
ValueLocation*& _location)
{
// TODO: In some source languages the object address might be a pointer
// to a descriptor, not the actual object data.
// If the given location looks good already, just clone it.
int32 count = objectLocation.CountPieces();
if (count == 0)
return B_BAD_VALUE;
ValuePieceLocation piece = objectLocation.PieceAt(0);
if (count > 1 || piece.type != VALUE_PIECE_LOCATION_MEMORY
|| piece.size != 0 || piece.bitSize != 0) {
ValueLocation* location
= new(std::nothrow) ValueLocation(objectLocation);
if (location == NULL || location->CountPieces() != count) {
delete location;
return B_NO_MEMORY;
}
_location = location;
return B_OK;
}
// The location contains just a single address piece with a zero size
// -- set the type's size.
piece.SetSize(ByteSize());
// TODO: Use bit size and bit offset, if specified!
ValueLocation* location = new(std::nothrow) ValueLocation(
objectLocation.IsBigEndian());
if (location == NULL || !location->AddPiece(piece)) {
delete location;
return B_NO_MEMORY;
}
_location = location;
return B_OK;
}
status_t
BListValueNode::BListElementNodeChild::ResolveLocation(
ValueLoader* valueLoader, ValueLocation*& _location)
{
uint8 addressSize = valueLoader->GetArchitecture()->AddressSize();
ValueLocation* location = new(std::nothrow) ValueLocation();
if (location == NULL)
return B_NO_MEMORY;
uint64 listAddress = fParent->fDataLocation.ToUInt64();
listAddress += fElementIndex * addressSize;
ValuePieceLocation piece;
piece.SetToMemory(listAddress);
piece.SetSize(addressSize);
location->AddPiece(piece);
_location = location;
return B_OK;
}
status_t
ArchitectureX8664::GetReturnAddressLocation(StackFrame* frame,
target_size_t valueSize, ValueLocation*& _location)
{
// for the calling conventions currently in use on Haiku,
// the x86-64 rules for how values are returned are as follows:
//
// - 64 bit or smaller values are returned in RAX.
// - > 64 bit values are returned on the stack.
ValueLocation* location = new(std::nothrow) ValueLocation(
IsBigEndian());
if (location == NULL)
return B_NO_MEMORY;
BReference<ValueLocation> locationReference(location,
true);
if (valueSize <= 8) {
ValuePieceLocation piece;
piece.SetSize(valueSize);
piece.SetToRegister(X86_64_REGISTER_RAX);
if (!location->AddPiece(piece))
return B_NO_MEMORY;
} else {
ValuePieceLocation piece;
CpuStateX8664* state = dynamic_cast<CpuStateX8664*>(frame->GetCpuState());
piece.SetToMemory(state->IntRegisterValue(X86_64_REGISTER_RAX));
piece.SetSize(valueSize);
if (!location->AddPiece(piece))
return B_NO_MEMORY;
}
_location = locationReference.Detach();
return B_OK;
}
status_t
DwarfExpressionEvaluator::EvaluateLocation(const void* expression, size_t size,
ValueLocation& _location)
{
_location.Clear();
// the empty expression is a valid one
if (size == 0) {
ValuePieceLocation piece;
piece.SetToUnknown();
piece.SetSize(0);
return _location.AddPiece(piece) ? B_OK : B_NO_MEMORY;
}
fDataReader.SetTo(expression, size, fContext->AddressSize());
// parse the first (and maybe only) expression
try {
// push the object address, if any
target_addr_t objectAddress;
if (fContext->GetObjectAddress(objectAddress))
_Push(objectAddress);
ValuePieceLocation piece;
status_t error = _Evaluate(&piece);
if (error != B_OK)
return error;
// if that's all, it's only a simple expression without composition
if (fDataReader.BytesRemaining() == 0) {
if (!piece.IsValid())
piece.SetToMemory(_Pop());
piece.SetSize(0);
return _location.AddPiece(piece) ? B_OK : B_NO_MEMORY;
}
// there's more, so it must be a composition operator
uint8 opcode = fDataReader.Read<uint8>(0);
if (opcode == DW_OP_piece) {
piece.SetSize(fDataReader.ReadUnsignedLEB128(0));
} else if (opcode == DW_OP_bit_piece) {
uint64 bitSize = fDataReader.ReadUnsignedLEB128(0);
piece.SetSize(bitSize, fDataReader.ReadUnsignedLEB128(0));
} else
return B_BAD_DATA;
// If there's a composition operator, there must be at least two
// simple expressions, so this must not be the end.
if (fDataReader.BytesRemaining() == 0)
return B_BAD_DATA;
} catch (const EvaluationException& exception) {
WARNING("DwarfExpressionEvaluator::EvaluateLocation(): %s\n",
exception.message);
return B_BAD_VALUE;
} catch (const std::bad_alloc& exception) {
return B_NO_MEMORY;
}
// parse subsequent expressions (at least one)
while (fDataReader.BytesRemaining() > 0) {
// Restrict the data reader to the remaining bytes to prevent jumping
// back.
fDataReader.SetTo(fDataReader.Data(), fDataReader.BytesRemaining(),
fDataReader.AddressSize());
try {
// push the object address, if any
target_addr_t objectAddress;
if (fContext->GetObjectAddress(objectAddress))
_Push(objectAddress);
ValuePieceLocation piece;
status_t error = _Evaluate(&piece);
if (error != B_OK)
return error;
if (!piece.IsValid())
piece.SetToMemory(_Pop());
// each expression must be followed by a composition operator
if (fDataReader.BytesRemaining() == 0)
return B_BAD_DATA;
uint8 opcode = fDataReader.Read<uint8>(0);
if (opcode == DW_OP_piece) {
piece.SetSize(fDataReader.ReadUnsignedLEB128(0));
} else if (opcode == DW_OP_bit_piece) {
uint64 bitSize = fDataReader.ReadUnsignedLEB128(0);
piece.SetSize(bitSize, fDataReader.ReadUnsignedLEB128(0));
} else
return B_BAD_DATA;
} catch (const EvaluationException& exception) {
WARNING("DwarfExpressionEvaluator::EvaluateLocation(): %s\n",
exception.message);
return B_BAD_VALUE;
} catch (const std::bad_alloc& exception) {
return B_NO_MEMORY;
}
}
return B_OK;
}
status_t
DwarfCompoundType::_ResolveDataMemberLocation(DwarfType* memberType,
const MemberLocation* memberLocation,
const ValueLocation& parentLocation, bool isBitField,
ValueLocation*& _location)
{
// create the value location object for the member
ValueLocation* location = new(std::nothrow) ValueLocation(
parentLocation.IsBigEndian());
if (location == NULL)
return B_NO_MEMORY;
BReference<ValueLocation> locationReference(location, true);
switch (memberLocation->attributeClass) {
case ATTRIBUTE_CLASS_CONSTANT:
{
if (isBitField) {
if (!location->SetTo(parentLocation,
memberLocation->constant * 8,
memberType->ByteSize() * 8)) {
return B_NO_MEMORY;
}
} else {
if (!location->SetToByteOffset(parentLocation,
memberLocation->constant,
memberType->ByteSize())) {
return B_NO_MEMORY;
}
}
break;
}
case ATTRIBUTE_CLASS_BLOCK:
case ATTRIBUTE_CLASS_LOCLISTPTR:
{
// The attribute is a location description. Since we need to push
// the parent object value onto the stack, we require the parent
// location to be a memory location.
if (parentLocation.CountPieces() != 1)
return B_BAD_VALUE;
ValuePieceLocation piece = parentLocation.PieceAt(0);
if (piece.type != VALUE_PIECE_LOCATION_MEMORY)
return B_BAD_VALUE;
// convert member location to location description
LocationDescription locationDescription;
if (memberLocation->attributeClass == ATTRIBUTE_CLASS_BLOCK) {
locationDescription.SetToExpression(
memberLocation->expression.data,
memberLocation->expression.length);
} else {
locationDescription.SetToLocationList(
memberLocation->listOffset);
}
// evaluate the location description
status_t error = memberType->ResolveLocation(TypeContext(),
&locationDescription, piece.address, true, *location);
if (error != B_OK)
return error;
break;
}
default:
{
// for unions the member location can be omitted -- all members
// start at the beginning of the parent object
if (fEntry->Tag() != DW_TAG_union_type)
return B_BAD_VALUE;
// since all members start at the same location, set up
// the location by hand since we don't want the size difference
// between the overall union and the member being
// factored into the assigned address.
ValuePieceLocation piece = parentLocation.PieceAt(0);
piece.SetSize(memberType->ByteSize());
if (!location->AddPiece(piece))
return B_NO_MEMORY;
break;
}
}
_location = locationReference.Detach();
return B_OK;
}
status_t
DwarfType::ResolveLocation(DwarfTypeContext* typeContext,
const LocationDescription* description, target_addr_t objectAddress,
bool hasObjectAddress, ValueLocation& _location)
{
status_t error = typeContext->File()->ResolveLocation(
typeContext->GetCompilationUnit(), typeContext->AddressSize(),
typeContext->SubprogramEntry(), description,
typeContext->TargetInterface(), typeContext->InstructionPointer(),
objectAddress, hasObjectAddress, typeContext->FramePointer(),
typeContext->RelocationDelta(), _location);
if (error != B_OK)
return error;
// translate the DWARF register indices and the bit offset/size semantics
const Register* registers = typeContext->GetArchitecture()->Registers();
bool bigEndian = typeContext->GetArchitecture()->IsBigEndian();
int32 count = _location.CountPieces();
for (int32 i = 0; i < count; i++) {
ValuePieceLocation piece = _location.PieceAt(i);
if (piece.type == VALUE_PIECE_LOCATION_REGISTER) {
int32 reg = typeContext->FromDwarfRegisterMap()->MapRegisterIndex(
piece.reg);
if (reg >= 0) {
piece.reg = reg;
// The bit offset for registers is to the least
// significant bit, while we want the offset to the most
// significant bit.
if (registers[reg].BitSize() > piece.bitSize) {
piece.bitOffset = registers[reg].BitSize() - piece.bitSize
- piece.bitOffset;
}
} else
piece.SetToUnknown();
} else if (piece.type == VALUE_PIECE_LOCATION_MEMORY) {
// Whether the bit offset is to the least or most significant bit
// is target architecture and source language specific.
// TODO: Check whether this is correct!
// TODO: Source language!
if (!bigEndian && piece.size * 8 > piece.bitSize) {
piece.bitOffset = piece.size * 8 - piece.bitSize
- piece.bitOffset;
}
}
piece.Normalize(bigEndian);
_location.SetPieceAt(i, piece);
}
// If we only have one piece and that doesn't have a size, try to retrieve
// the size of the type.
if (count == 1) {
ValuePieceLocation piece = _location.PieceAt(0);
if (piece.IsValid() && piece.size == 0 && piece.bitSize == 0) {
piece.SetSize(ByteSize());
// TODO: Use bit size and bit offset, if specified!
_location.SetPieceAt(0, piece);
TRACE_LOCALS(" set single piece size to %" B_PRIu64 "\n",
ByteSize());
}
}
return B_OK;
}
status_t
DwarfArrayType::ResolveElementLocation(const ArrayIndexPath& indexPath,
const ValueLocation& parentLocation, ValueLocation*& _location)
{
if (indexPath.CountIndices() != CountDimensions())
return B_BAD_VALUE;
DwarfTypeContext* typeContext = TypeContext();
// If the array entry has a bit stride, get it. Otherwise fall back to the
// element type size.
int64 bitStride;
DIEArrayType* bitStrideOwnerEntry = NULL;
if (fEntry != NULL && (bitStrideOwnerEntry = DwarfUtils::GetDIEByPredicate(
fEntry, HasBitStridePredicate<DIEArrayType>()))) {
BVariant value;
status_t error = typeContext->File()->EvaluateDynamicValue(
typeContext->GetCompilationUnit(), typeContext->AddressSize(),
typeContext->SubprogramEntry(), bitStrideOwnerEntry->BitStride(),
typeContext->TargetInterface(), typeContext->InstructionPointer(),
typeContext->FramePointer(), value);
if (error != B_OK)
return error;
if (!value.IsInteger())
return B_BAD_VALUE;
bitStride = value.ToInt64();
} else
bitStride = BaseType()->ByteSize() * 8;
// Iterate backward through the dimensions and compute the total offset of
// the element.
int64 elementOffset = 0;
DwarfArrayDimension* previousDimension = NULL;
int64 previousDimensionStride = 0;
for (int32 dimensionIndex = CountDimensions() - 1;
dimensionIndex >= 0; dimensionIndex--) {
DwarfArrayDimension* dimension = DwarfDimensionAt(dimensionIndex);
int64 index = indexPath.IndexAt(dimensionIndex);
// If the dimension has a special bit/byte stride, get it.
int64 dimensionStride = 0;
DwarfType* dimensionType = dimension->GetDwarfType();
DIEArrayIndexType* dimensionTypeEntry = dimensionType != NULL
? dynamic_cast<DIEArrayIndexType*>(dimensionType->GetDIEType())
: NULL;
if (dimensionTypeEntry != NULL) {
DIEArrayIndexType* bitStrideOwnerEntry
= DwarfUtils::GetDIEByPredicate(dimensionTypeEntry,
HasBitStridePredicate<DIEArrayIndexType>());
if (bitStrideOwnerEntry != NULL) {
BVariant value;
status_t error = typeContext->File()->EvaluateDynamicValue(
typeContext->GetCompilationUnit(),
typeContext->AddressSize(),
typeContext->SubprogramEntry(),
bitStrideOwnerEntry->BitStride(),
typeContext->TargetInterface(),
typeContext->InstructionPointer(),
typeContext->FramePointer(), value);
if (error != B_OK)
return error;
if (!value.IsInteger())
return B_BAD_VALUE;
dimensionStride = value.ToInt64();
} else {
DIEArrayIndexType* byteStrideOwnerEntry
= DwarfUtils::GetDIEByPredicate(dimensionTypeEntry,
HasByteStridePredicate<DIEArrayIndexType>());
if (byteStrideOwnerEntry != NULL) {
BVariant value;
status_t error = typeContext->File()->EvaluateDynamicValue(
typeContext->GetCompilationUnit(),
typeContext->AddressSize(),
typeContext->SubprogramEntry(),
byteStrideOwnerEntry->ByteStride(),
typeContext->TargetInterface(),
typeContext->InstructionPointer(),
typeContext->FramePointer(), value);
if (error != B_OK)
return error;
if (!value.IsInteger())
return B_BAD_VALUE;
dimensionStride = value.ToInt64() * 8;
}
}
}
// If we don't have a stride for the dimension yet, use the stride of
// the previous dimension multiplied by the size of the dimension.
if (dimensionStride == 0) {
if (previousDimension != NULL) {
dimensionStride = previousDimensionStride
* previousDimension->CountElements();
} else {
// the last dimension -- use the element bit stride
dimensionStride = bitStride;
}
}
// If the dimension stride is still 0 (that can happen, if the dimension
// doesn't have a stride and the previous dimension's element count is
// not known), we can only resolve the first element.
if (dimensionStride == 0 && index != 0) {
WARNING("No dimension bit stride for dimension %" B_PRId32 " and "
"element index is not 0.\n", dimensionIndex);
return B_BAD_VALUE;
}
elementOffset += dimensionStride * index;
previousDimension = dimension;
previousDimensionStride = dimensionStride;
}
TRACE_LOCALS("total element bit offset: %" B_PRId64 "\n", elementOffset);
// create the value location object for the element
ValueLocation* location = new(std::nothrow) ValueLocation(
parentLocation.IsBigEndian());
if (location == NULL)
return B_NO_MEMORY;
BReference<ValueLocation> locationReference(location, true);
// If we have a single memory piece location for the array, we compute the
// element's location by hand -- not uncommonly the array size isn't known.
if (parentLocation.CountPieces() == 1) {
ValuePieceLocation piece = parentLocation.PieceAt(0);
if (piece.type == VALUE_PIECE_LOCATION_MEMORY) {
int64 byteOffset = elementOffset >= 0
? elementOffset / 8 : (elementOffset - 7) / 8;
piece.SetToMemory(piece.address + byteOffset);
piece.SetSize(BaseType()->ByteSize());
// TODO: Support bit offsets correctly!
// TODO: Support bit fields (primitive types) correctly!
if (!location->AddPiece(piece))
return B_NO_MEMORY;
_location = locationReference.Detach();
return B_OK;
}
}
// We can't deal with negative element offsets at this point. It doesn't
// make a lot of sense anyway, if the array location consists of multiple
// pieces or lives in a register.
if (elementOffset < 0) {
WARNING("Negative element offset unsupported for multiple location "
"pieces or register pieces.\n");
return B_UNSUPPORTED;
}
if (!location->SetTo(parentLocation, elementOffset,
BaseType()->ByteSize() * 8)) {
return B_NO_MEMORY;
}
_location = locationReference.Detach();
return B_OK;
}
bool
ValueLocation::SetTo(const ValueLocation& other, uint64 bitOffset,
uint64 bitSize)
{
Clear();
fBigEndian = other.fBigEndian;
// compute the total bit size
int32 count = other.CountPieces();
uint64 totalBitSize = 0;
for (int32 i = 0; i < count; i++) {
const ValuePieceLocation &piece = other.PieceAt(i);
totalBitSize += piece.bitSize;
}
// adjust requested bit offset/size to something reasonable, if necessary
if (bitOffset + bitSize > totalBitSize) {
if (bitOffset >= totalBitSize)
return true;
bitSize = totalBitSize - bitOffset;
}
if (fBigEndian) {
// Big endian: Skip the superfluous most significant bits, copy the
// pieces we need (cutting the first and the last one as needed) and
// ignore the remaining pieces.
// skip pieces for the most significant bits we don't need anymore
uint64 bitsToSkip = bitOffset;
int32 i;
ValuePieceLocation piece;
for (i = 0; i < count; i++) {
const ValuePieceLocation& tempPiece = other.PieceAt(i);
if (tempPiece.bitSize > bitsToSkip) {
if (!piece.Copy(tempPiece))
return false;
break;
}
bitsToSkip -= tempPiece.bitSize;
}
// handle partial piece
if (bitsToSkip > 0) {
piece.bitOffset += bitsToSkip;
piece.bitSize -= bitsToSkip;
piece.Normalize(fBigEndian);
}
// handle remaining pieces
while (bitSize > 0) {
if (piece.bitSize > bitSize) {
// the piece is bigger than the remaining size -- cut it
piece.bitSize = bitSize;
piece.Normalize(fBigEndian);
bitSize = 0;
} else
bitSize -= piece.bitSize;
if (!AddPiece(piece))
return false;
if (++i >= count)
break;
if (!piece.Copy(other.PieceAt(i)))
return false;
}
} else {
// Little endian: Skip the superfluous least significant bits, copy the
// pieces we need (cutting the first and the last one as needed) and
// ignore the remaining pieces.
// skip pieces for the least significant bits we don't need anymore
uint64 bitsToSkip = totalBitSize - bitOffset - bitSize;
int32 i;
ValuePieceLocation piece;
for (i = 0; i < count; i++) {
const ValuePieceLocation& tempPiece = other.PieceAt(i);
if (tempPiece.bitSize > bitsToSkip) {
if (!piece.Copy(tempPiece))
return false;
break;
}
bitsToSkip -= piece.bitSize;
}
// handle partial piece
if (bitsToSkip > 0) {
piece.bitSize -= bitsToSkip;
piece.Normalize(fBigEndian);
}
// handle remaining pieces
while (bitSize > 0) {
if (piece.bitSize > bitSize) {
// the piece is bigger than the remaining size -- cut it
piece.bitOffset += piece.bitSize - bitSize;
piece.bitSize = bitSize;
piece.Normalize(fBigEndian);
bitSize = 0;
} else
bitSize -= piece.bitSize;
if (!AddPiece(piece))
return false;
if (++i >= count)
break;
if (!piece.Copy(other.PieceAt(i)))
return false;
}
}
return true;
}
