DWARFExpression.cpp File Reference

#include "lldb/Expression/DWARFExpression.h"
#include <cinttypes>
#include <optional>
#include <vector>
#include "lldb/Core/Module.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/dwarf.h"
#include "lldb/Utility/DataEncoder.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegisterValue.h"
#include "lldb/Utility/Scalar.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/VMRange.h"
#include "lldb/Host/Host.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Target/ABI.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/StackID.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugLoc.h"
#include "llvm/DebugInfo/DWARF/DWARFExpression.h"
#include "Plugins/SymbolFile/DWARF/DWARFUnit.h"

Go to the source code of this file.

Functions
static llvm::Error	ReadRegisterValueAsScalar (RegisterContext *reg_ctx, lldb::RegisterKind reg_kind, uint32_t reg_num, Value &value)
static lldb::offset_t	GetOpcodeDataSize (const DataExtractor &data, const lldb::offset_t data_offset, const uint8_t op, const DWARFUnit *dwarf_cu)
	Return the length in bytes of the set of operands for op.
static llvm::Error	Evaluate_DW_OP_entry_value (std::vector< Value > &stack, ExecutionContext *exe_ctx, RegisterContext *reg_ctx, const DataExtractor &opcodes, lldb::offset_t &opcode_offset, Log *log)
static llvm::Expected< lldb::addr_t >	ResolveLoadAddress (ExecutionContext *exe_ctx, lldb::ModuleSP &module_sp, const char *dw_op_type, lldb::addr_t file_addr, Address &so_addr, bool check_sectionoffset=false)
	Helper function to move common code used to resolve a file address and turn into a load address.
static Scalar	DerefSizeExtractDataHelper (uint8_t *addr_bytes, size_t size_addr_bytes, ByteOrder byte_order, size_t size)
	Helper function to move common code used to load sized data from a uint8_t buffer.

Function Documentation

DerefSizeExtractDataHelper()

static Scalar DerefSizeExtractDataHelper ( uint8_t *  addr_bytes, size_t  size_addr_bytes, ByteOrder  byte_order, size_t  size  )

static

Helper function to move common code used to load sized data from a uint8_t buffer.

Parameters

addr_bytes	uint8_t buffer containg raw data
size_addr_bytes	how large is the underlying raw data
byte_order	what is the byter order of the underlyig data
size	How much of the underlying data we want to use

Returns

The underlying data converted into a Scalar

Definition at line 813 of file DWARFExpression.cpp.

References lldb_private::DataExtractor::GetAddress(), and lldb_private::DataExtractor::GetMaxU64().

Referenced by lldb_private::DWARFExpression::Evaluate().

Evaluate_DW_OP_entry_value()

static llvm::Error Evaluate_DW_OP_entry_value ( std::vector< Value > &  stack, ExecutionContext *  exe_ctx, RegisterContext *  reg_ctx, const DataExtractor &  opcodes, lldb::offset_t &  opcode_offset, Log *  log  )

static

Definition at line 534 of file DWARFExpression.cpp.

References lldb_private::DataExtractor::BytesLeft(), lldb_private::DWARFExpressionList::Evaluate(), lldb_private::SymbolContext::function, lldb_private::Function::GetCallEdgeForReturnAddress(), lldb_private::CallEdge::GetCallee(), lldb_private::CallEdge::GetCallSiteParameters(), lldb_private::DataExtractor::GetData(), lldb_private::StackFrame::GetFrameIndex(), lldb_private::ExecutionContext::GetFramePtr(), lldb_private::Target::GetImages(), lldb_private::Function::GetName(), lldb_private::ExecutionContext::GetRegisterContext(), lldb_private::Thread::GetStackFrameAtIndex(), lldb_private::StackFrame::GetSymbolContext(), lldb_private::Function::GetTailCallingEdges(), lldb_private::ExecutionContext::GetTargetRef(), lldb_private::ExecutionContext::GetThreadPtr(), lldb_private::DataExtractor::GetULEB128(), lldb_private::ExecutionContext::HasTargetScope(), LLDB_INVALID_ADDRESS, LLDB_LOG, lldb_private::CallSiteParameter::LocationInCaller, and lldb_private::ExecutionContext::SetFrameSP().

Referenced by lldb_private::DWARFExpression::Evaluate().

GetOpcodeDataSize()

static lldb::offset_t GetOpcodeDataSize ( const DataExtractor &  data, const lldb::offset_t  data_offset, const uint8_t  op, const DWARFUnit *  dwarf_cu  )

static

Return the length in bytes of the set of operands for op.

No guarantees are made on the state of data after this call.

Definition at line 133 of file DWARFExpression.cpp.

References lldb_private::DataExtractor::GetAddressByteSize(), lldb_private::plugin::dwarf::DWARFUnit::GetSymbolFileDWARF(), lldb_private::DataExtractor::GetULEB128(), lldb_private::plugin::dwarf::SymbolFileDWARF::GetVendorDWARFOpcodeSize(), LLDB_INVALID_OFFSET, and lldb_private::DataExtractor::Skip_LEB128().

Referenced by lldb_private::DWARFExpression::ContainsThreadLocalStorage(), lldb_private::DWARFExpression::GetLocation_DW_OP_addr(), lldb_private::DWARFExpression::LinkThreadLocalStorage(), and lldb_private::DWARFExpression::Update_DW_OP_addr().

ReadRegisterValueAsScalar()

static llvm::Error ReadRegisterValueAsScalar ( RegisterContext *  reg_ctx, lldb::RegisterKind  reg_kind, uint32_t  reg_num, Value &  value  )

static

Definition at line 97 of file DWARFExpression.cpp.

References lldb_private::RegisterContext::ConvertRegisterKindToRegisterNumber(), lldb_private::RegisterContext::GetRegisterInfoAtIndex(), lldb_private::Value::GetScalar(), lldb_private::RegisterValue::GetScalarValue(), LLDB_INVALID_REGNUM, lldb_private::RegisterInfo::name, lldb_private::RegisterContext::ReadRegister(), lldb_private::Value::RegisterInfo, lldb_private::Value::Scalar, lldb_private::Value::SetContext(), and lldb_private::Value::SetValueType().

Referenced by lldb_private::DWARFExpression::Evaluate().

ResolveLoadAddress()

static llvm::Expected< lldb::addr_t > ResolveLoadAddress ( ExecutionContext *  exe_ctx, lldb::ModuleSP &  module_sp, const char *  dw_op_type, lldb::addr_t  file_addr, Address &  so_addr, bool  check_sectionoffset = false  )

static

Helper function to move common code used to resolve a file address and turn into a load address.

Parameters

exe_ctx	Pointer to the execution context
module_sp	shared_ptr contains the module if we have one
dw_op_type	C-style string used to vary the error output
file_addr	the file address we are trying to resolve and turn into a load address
so_addr	out parameter, will be set to load address or section offset
check_sectionoffset	bool which determines if having a section offset but not a load address is considerd a success

Returns

std::optional containing the load address if resolving and getting the load address succeed or an empty Optinal otherwise. If check_sectionoffset is true we consider LLDB_INVALID_ADDRESS a success if so_addr.IsSectionOffset() is true.

Definition at line 786 of file DWARFExpression.cpp.

References lldb_private::Address::GetLoadAddress(), lldb_private::ExecutionContext::GetTargetPtr(), lldb_private::Address::IsSectionOffset(), and LLDB_INVALID_ADDRESS.

Referenced by lldb_private::DWARFExpression::Evaluate().