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147 lines
4.7 KiB
147 lines
4.7 KiB
4 months ago
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//===-- DecodedThread.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_SOURCE_PLUGINS_TRACE_INTEL_PT_DECODEDTHREAD_H
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#define LLDB_SOURCE_PLUGINS_TRACE_INTEL_PT_DECODEDTHREAD_H
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#include <vector>
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/Error.h"
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#include "lldb/Target/Trace.h"
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#include "intel-pt.h"
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namespace lldb_private {
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namespace trace_intel_pt {
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/// Class for representing a libipt decoding error.
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class IntelPTError : public llvm::ErrorInfo<IntelPTError> {
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public:
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static char ID;
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/// \param[in] libipt_error_code
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/// Negative number returned by libipt when decoding the trace and
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/// signaling errors.
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///
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/// \param[in] address
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/// Optional instruction address. When decoding an individual instruction,
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/// its address might be available in the \a pt_insn object, and should be
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/// passed to this constructor. Other errors don't have an associated
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/// address.
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IntelPTError(int libipt_error_code,
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lldb::addr_t address = LLDB_INVALID_ADDRESS);
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std::error_code convertToErrorCode() const override {
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return llvm::errc::not_supported;
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}
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void log(llvm::raw_ostream &OS) const override;
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private:
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int m_libipt_error_code;
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lldb::addr_t m_address;
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};
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/// \class IntelPTInstruction
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/// An instruction obtained from decoding a trace. It is either an actual
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/// instruction or an error indicating a gap in the trace.
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///
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/// Gaps in the trace can come in a few flavors:
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/// - tracing gaps (e.g. tracing was paused and then resumed)
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/// - tracing errors (e.g. buffer overflow)
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/// - decoding errors (e.g. some memory region couldn't be decoded)
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/// As mentioned, any gap is represented as an error in this class.
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class IntelPTInstruction {
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public:
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IntelPTInstruction(const pt_insn &pt_insn) : m_pt_insn(pt_insn) {}
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/// Error constructor
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///
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/// libipt errors should use the underlying \a IntelPTError class.
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IntelPTInstruction(llvm::Error err) {
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llvm::handleAllErrors(std::move(err),
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[&](std::unique_ptr<llvm::ErrorInfoBase> info) {
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m_error = std::move(info);
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});
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}
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/// Check if this object represents an error (i.e. a gap).
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///
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/// \return
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/// Whether this object represents an error.
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bool IsError() const;
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/// \return
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/// The instruction pointer address, or an \a llvm::Error if it is an
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/// error.
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llvm::Expected<lldb::addr_t> GetLoadAddress() const;
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/// \return
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/// An \a llvm::Error object if this class corresponds to an Error, or an
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/// \a llvm::Error::success otherwise.
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llvm::Error ToError() const;
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IntelPTInstruction(IntelPTInstruction &&other) = default;
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private:
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IntelPTInstruction(const IntelPTInstruction &other) = delete;
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const IntelPTInstruction &operator=(const IntelPTInstruction &other) = delete;
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pt_insn m_pt_insn;
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std::unique_ptr<llvm::ErrorInfoBase> m_error;
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};
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/// \class DecodedThread
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/// Class holding the instructions and function call hierarchy obtained from
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/// decoding a trace, as well as a position cursor used when reverse debugging
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/// the trace.
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///
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/// Each decoded thread contains a cursor to the current position the user is
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/// stopped at. See \a Trace::GetCursorPosition for more information.
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class DecodedThread {
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public:
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DecodedThread(std::vector<IntelPTInstruction> &&instructions)
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: m_instructions(std::move(instructions)), m_position(GetLastPosition()) {
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}
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/// Get the instructions from the decoded trace. Some of them might indicate
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/// errors (i.e. gaps) in the trace.
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///
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/// \return
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/// The instructions of the trace.
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llvm::ArrayRef<IntelPTInstruction> GetInstructions() const;
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/// \return
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/// The current position of the cursor of this trace, or 0 if there are no
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/// instructions.
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size_t GetCursorPosition() const;
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/// Change the position of the cursor of this trace. If this value is to high,
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/// the new position will be set as the last instruction of the trace.
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///
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/// \return
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/// The effective new position.
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size_t SetCursorPosition(size_t new_position);
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/// \}
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private:
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/// \return
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/// The index of the last element of the trace, or 0 if empty.
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size_t GetLastPosition() const;
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std::vector<IntelPTInstruction> m_instructions;
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size_t m_position;
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};
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} // namespace trace_intel_pt
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} // namespace lldb_private
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#endif // LLDB_SOURCE_PLUGINS_TRACE_INTEL_PT_DECODEDTHREAD_H
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