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/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/DWARFExpressionPrinter.h"
#include "llvm/DebugInfo/DWARF/LowLevel/DWARFExpression.h"

Go to the source code of this file.

Functions
static lldb::offset_t	GetOpcodeDataSize (const DataExtractor &data, const lldb::offset_t data_offset, const LocationAtom op, const DWARFExpression::Delegate *dwarf_cu)
	Return the length in bytes of the set of operands for op.
static const char *	DW_OP_value_to_name (uint32_t val)
static llvm::Error	Evaluate_DW_OP_entry_value (DWARFExpression::Stack &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 llvm::Error	Evaluate_DW_OP_deref (DWARFExpression::Stack &stack, ExecutionContext *exe_ctx, lldb::ModuleSP module_sp, Process *process)
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()

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 930 of file DWARFExpression.cpp.

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

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

DW_OP_value_to_name()

const char * DW_OP_value_to_name ( uint32_t val )

static

Definition at line 395 of file DWARFExpression.cpp.

Referenced by lldb_private::DWARFExpression::Evaluate(), and lldb_private::DWARFExpression::GetLocation_DW_OP_addr().

Evaluate_DW_OP_deref()

llvm::Error Evaluate_DW_OP_deref ( DWARFExpression::Stack & stack, ExecutionContext * exe_ctx, lldb::ModuleSP module_sp, Process * process )

static

Definition at line 864 of file DWARFExpression.cpp.

References error(), lldb_private::Value::FileAddress, lldb_private::Value::HostAddress, lldb_private::Value::Invalid, LLDB_INVALID_ADDRESS, lldb_private::Value::LoadAddress, lldb_private::Process::ReadPointerFromMemory(), ResolveLoadAddress(), and lldb_private::Value::Scalar.

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

Evaluate_DW_OP_entry_value()

llvm::Error Evaluate_DW_OP_entry_value ( DWARFExpression::Stack & stack, ExecutionContext * exe_ctx, RegisterContext * reg_ctx, const DataExtractor & opcodes, lldb::offset_t & opcode_offset, Log * log )

static

Definition at line 593 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::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()

lldb::offset_t GetOpcodeDataSize ( const DataExtractor & data, const lldb::offset_t data_offset, const LocationAtom op, const DWARFExpression::Delegate * 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 132 of file DWARFExpression.cpp.

References lldb_private::DataExtractor::GetAddressByteSize(), lldb_private::DWARFExpression::Delegate::GetAddressByteSize(), lldb_private::DataExtractor::GetU8(), lldb_private::DataExtractor::GetULEB128(), lldb_private::DWARFExpression::Delegate::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().

ResolveLoadAddress()

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 845 of file DWARFExpression.cpp.

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

Referenced by ProcessMachCore::DoGetMemoryRegionInfo(), lldb_private::DWARFExpression::Evaluate(), and Evaluate_DW_OP_deref().