169 lines
6.3 KiB
C++
169 lines
6.3 KiB
C++
//===-- DWARFExpression.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_EXPRESSION_DWARFEXPRESSION_H
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#define LLDB_EXPRESSION_DWARFEXPRESSION_H
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#include "lldb/Core/Address.h"
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#include "lldb/Core/Disassembler.h"
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#include "lldb/Utility/DataExtractor.h"
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#include "lldb/Utility/Scalar.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/lldb-private.h"
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#include "llvm/DebugInfo/DWARF/DWARFLocationExpression.h"
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#include <functional>
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class DWARFUnit;
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namespace lldb_private {
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/// \class DWARFExpression DWARFExpression.h
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/// "lldb/Expression/DWARFExpression.h" Encapsulates a DWARF location
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/// expression and interprets it.
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///
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/// DWARF location expressions are used in two ways by LLDB. The first
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/// use is to find entities specified in the debug information, since their
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/// locations are specified in precisely this language. The second is to
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/// interpret expressions without having to run the target in cases where the
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/// overhead from copying JIT-compiled code into the target is too high or
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/// where the target cannot be run. This class encapsulates a single DWARF
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/// location expression or a location list and interprets it.
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class DWARFExpression {
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public:
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DWARFExpression();
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/// Constructor
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///
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/// \param[in] data
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/// A data extractor configured to read the DWARF location expression's
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/// bytecode.
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DWARFExpression(const DataExtractor &data);
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/// Destructor
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virtual ~DWARFExpression();
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/// Return true if the location expression contains data
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bool IsValid() const;
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/// If a location is not a location list, return true if the location
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/// contains a DW_OP_addr () opcode in the stream that matches \a file_addr.
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/// If file_addr is LLDB_INVALID_ADDRESS, the this function will return true
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/// if the variable there is any DW_OP_addr in a location that (yet still is
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/// NOT a location list). This helps us detect if a variable is a global or
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/// static variable since there is no other indication from DWARF debug
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/// info.
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///
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/// \param[in] dwarf_cu
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/// The dwarf unit this expression belongs to.
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///
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/// \param[in] op_addr_idx
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/// The DW_OP_addr index to retrieve in case there is more than
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/// one DW_OP_addr opcode in the location byte stream.
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///
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/// \param[out] error
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/// If the location stream contains unknown DW_OP opcodes or the
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/// data is missing, \a error will be set to \b true.
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///
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/// \return
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/// LLDB_INVALID_ADDRESS if the location doesn't contain a
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/// DW_OP_addr for \a op_addr_idx, otherwise a valid file address
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lldb::addr_t GetLocation_DW_OP_addr(const DWARFUnit *dwarf_cu,
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uint32_t op_addr_idx, bool &error) const;
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bool Update_DW_OP_addr(const DWARFUnit *dwarf_cu, lldb::addr_t file_addr);
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void UpdateValue(uint64_t const_value, lldb::offset_t const_value_byte_size,
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uint8_t addr_byte_size);
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bool ContainsThreadLocalStorage(const DWARFUnit *dwarf_cu) const;
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bool LinkThreadLocalStorage(
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const DWARFUnit *dwarf_cu,
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std::function<lldb::addr_t(lldb::addr_t file_addr)> const
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&link_address_callback);
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/// Return the call-frame-info style register kind
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lldb::RegisterKind GetRegisterKind() const;
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/// Set the call-frame-info style register kind
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///
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/// \param[in] reg_kind
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/// The register kind.
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void SetRegisterKind(lldb::RegisterKind reg_kind);
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/// Evaluate a DWARF location expression in a particular context
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///
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/// \param[in] exe_ctx
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/// The execution context in which to evaluate the location
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/// expression. The location expression may access the target's
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/// memory, especially if it comes from the expression parser.
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///
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/// \param[in] opcode_ctx
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/// The module which defined the expression.
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///
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/// \param[in] opcodes
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/// This is a static method so the opcodes need to be provided
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/// explicitly.
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///
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/// \param[in] reg_ctx
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/// An optional parameter which provides a RegisterContext for use
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/// when evaluating the expression (i.e. for fetching register values).
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/// Normally this will come from the ExecutionContext's StackFrame but
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/// in the case where an expression needs to be evaluated while building
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/// the stack frame list, this short-cut is available.
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///
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/// \param[in] reg_set
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/// The call-frame-info style register kind.
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///
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/// \param[in] initial_value_ptr
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/// A value to put on top of the interpreter stack before evaluating
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/// the expression, if the expression is parametrized. Can be NULL.
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///
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/// \param[in] result
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/// A value into which the result of evaluating the expression is
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/// to be placed.
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///
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/// \param[in] error_ptr
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/// If non-NULL, used to report errors in expression evaluation.
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///
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/// \return
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/// True on success; false otherwise. If error_ptr is non-NULL,
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/// details of the failure are provided through it.
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static bool Evaluate(ExecutionContext *exe_ctx, RegisterContext *reg_ctx,
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lldb::ModuleSP module_sp, const DataExtractor &opcodes,
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const DWARFUnit *dwarf_cu,
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const lldb::RegisterKind reg_set,
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const Value *initial_value_ptr,
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const Value *object_address_ptr, Value &result,
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Status *error_ptr);
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static bool ParseDWARFLocationList(const DWARFUnit *dwarf_cu,
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const DataExtractor &data,
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DWARFExpressionList *loc_list);
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bool GetExpressionData(DataExtractor &data) const {
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data = m_data;
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return data.GetByteSize() > 0;
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}
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void DumpLocation(Stream *s, lldb::DescriptionLevel level, ABI *abi) const;
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bool MatchesOperand(StackFrame &frame, const Instruction::Operand &op) const;
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private:
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/// A data extractor capable of reading opcode bytes
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DataExtractor m_data;
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/// One of the defines that starts with LLDB_REGKIND_
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lldb::RegisterKind m_reg_kind = lldb::eRegisterKindDWARF;
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};
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} // namespace lldb_private
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#endif // LLDB_EXPRESSION_DWARFEXPRESSION_H
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