Pin 3.20 Release Notes
=====================

Pin is a tool for the instrumentation of programs. It supports the Linux*, macOS*
and Windows* operating systems and executables for the IA-32 and Intel(R) 64
architectures.

For license information, see the EULA.txt file and the licensing directory.

For information on how to use Pin, read the manual in doc/html/index.html.

For questions and bug reports please visit https://groups.io/g/pinheads

For downloading Intel(R) X86 Encoder Decoder please visit http://www.intel.com/software/xed

Installation
============

To install a kit, unpack a kit and change to the directory.

Linux / macOS*:

   $ tar zxf pin-3.2-81205-gcc-linux.tar.gz
   $ cd pin-3.2-81205-gcc-linux
   Use the macOS* kit names respectively.

Windows: Unzip the installation files, extracting all files in the kit.

   $ cd  pin-3.2-81205-msvc-windows

For better security, be advised to install on secure location.

Example usage
=============

This example applies to a 64-bit application. For a 32-bit application please use "obj-ia32"
instead of "obj-intel64" and add "TARGET=ia32" to the make command.

To build and run a sample tool on Linux*:

    cd source/tools/SimpleExamples
    make obj-intel64/opcodemix.so
    ../../../pin -t obj-intel64/opcodemix.so -- /bin/ls

    This will instrument and run /bin/ls, the output for this tool is in
    opcodemix.out.

To build and run a sample tool on Windows*, open a MSVC x86/x64 command line prompt
(depending on the application type) and run:

    cd source\tools\SimpleExamples
    make obj-intel64/opcodemix.dll
    ..\..\..\pin.exe -t obj-intel64\opcodemix.dll -- cmd /C dir

    This will instrument and run cmd /C dir, the output for this tool is in
    opcodemix.out.

Refer to the Examples section in the Pin User Guide for more usage examples.

Restrictions
============
   
   o Tools are restricted from linking with any system libraries and/or calling
     any system calls. See the paragraph on PinCRT in the "Additional information
     for PinTool writers" section for more information.

   o Pin on Windows* requires dbghelp.dll version 6.11.1.404.  This DLL is
     distributed with the kit.

   o Pin on Windows* requires msdia120.dll.  This DLL is distributed with the kit.

   o There is a known problem of using pin on systems protected by the
     "McAfee Host Intrusion Prevention"* antivirus software.  See the 
     "Additional Information for Using Pin on Windows*" section for more
     information.

   o There is a known problem of attaching pin to a running process on Linux systems that
     prevent the use of ptrace attach using the sysctl /proc/sys/kernel/yama/ptrace_scope.
     See the "Additional information for using Pin on Linux*" section for more
     information.

   o Pin performs memory allocations in the application's address space.  
     As a result, memory allocations performed by the application can fail. 
     For example, some applications use the SmartHeap utility which could 
     perform huge memory allocations. Using the "-pin_memory_range" and/or 
     "-cc_memory_range" switches may be helpful in some of these cases.
     On Windows*, using Microsoft* 
     Visual C++ compiler* "editbin"* utility to rebase pinvm.dll and the
     pintool preferred loading addresses might be helpful as well, for
     example:
        editbin /REBASE:BASE=0x57000000 pinvm.dll
        editbin /REBASE:BASE=0x58000000 <pintool>
     is helpful in some Windows applications.

   o There are known problems using Pin with the Google Chrome web browser:
     On Windows, Pin may fail to attach to a running Chrome process.
     On Linux, Pin may crash when instrumenting Chrome.
     A possible workaround is to launch Chrome with the "--no-sandbox" command 
     line switch.

   o Pin will run on all Intel(R) 64 architectures. An IA-32 architecture needs the
     following features:
         C8 - CMPXCHG8B 
         SSE2
         CMOV 
         FXSR - FXSAVE/FXRSTOR 
     Pentium(R) III processors do not have SSE2. Pentium(R) 4 processors can run Pin. 
     You can check the capabilities of your processor on Linux with the following 
     command:
         cat /proc/cpuinfo

   o Pin has not been tested on systems with non-Intel processors.
     Therefore, incompatible or proprietary instructions in non-Intel processors may cause 
     Pin to function incorrectly. Any attempt to instrument code not supported by Intel 
     processors may lead to failures.


Additional information for PinTool writers
============================================

   o Pin is built and distributed with its own OS-agnostic, compiler-agnostic runtime,
     named PinCRT. PinCRT exposes three layers of generic APIs which practically
     eliminate Pin’s and the tools’ dependency on the host system:
     1. A generic operating system interface, supplying basic OS services such as
        process control, thread control etc.
     2. A C-runtime layer supplying a standard C implementation. This is complemented
        by compiler-runtime functions necessary for enabling gcc, msvc, clang and icc.
     3. A C++ runtime. Please note that the current version does not support C++11 and
        RTTI (Run-Time Type Information).
     Tools are obliged to use (link with) PinCRT instead of any system runtime. Tools
     must refrain from using any native system calls, and use PinCRT APIs for any
     needed functionality.
     Note: PinCRT implements a consistent interface across all supported operating systems, based
     on the Bionic runtime. As such, the PinCRT API may differ from the native system API. For additional
     information see the OS APIs user guide in extras/crt/docs/html and the PinCRT documentation at
     http://pintool.intel.com.

   o PinCRT currently does not support the Boost C++ libraries due to lack of RTTI. 

   o Pin uses new method to handle application exit in Jit mode. Once exit
     is started in application or internal thread, Pin gracefully terminates
     all application threads that did not initiate the exit.
     On Windows application thread that initiated exit remains active under
     Pin control until last safe point where Pin tool can operate properly.
     Pin APIs PIN_AddFiniUnlockedFunction, PIN_IsProcessExiting were removed.
     Added callback type PREPARE_FOR_FINI_CALLBACK and Pin API function
     PIN_AddPrepareForFiniFunction. PREPARE_FOR_FINI callbacks are delivered
     at the beginning of application exit activity and intended for graceful
     exit of internal threads and unsafe operations in Pin tool.
     Valid operation of internal threads and any APIs beyond Pin API and CRT
     used in Pin tool is not guaranteed after the callbacks.

   o Due to a compatibility issue between operating systems pin does *not*
     provide support for registering atexit functions inside pintools
     (which means that the behavior of a pintool that does so is undefined).
     If you need such functionality, please register a Fini function.
     In probe mode, the Fini function is not available, instead tools should
     define a global class and add the functionality to its destructor.

   o Some APIs from older versions of Pin have been deprecated and replaced 
     by more powerful, or simpler, interfaces in the current version of Pin.
     Usage of deprecated APIs in Pin Tools will trigger a compilation warning.
     You can #define PIN_DEPRECATED_WARNINGS=0 to disable these warnings.
     Please refer to the Pin Deprecated API section in the Pin User Guide for
     a list of the deprecated APIs and their replacements.
     Also note that such deprecated APIs may be completely removed in future
     versions of Pin without prior notice.
    
Additional information for using Pin on Windows*
===============================================

General issues
        
        Pin provides transparent support for exceptions in the application,
        but prohibits using exceptions in the tool. If you need to assert
        some condition, use the ASSERT() macro defined by pin instead of 
        the standard C assert().

        The Image API does not work for gcc-compiled applications.
        
        There is a known problem of using pin on systems protected by the
        "McAfee Host Intrusion Prevention"* antivirus software. We did not
        test coexistence of pin with other antivirus products that perform 
        run-time execution monitoring.
        
        Pin may not instrument applications that restrict loading of DLLs from
        non-local drives if Pin and / or Pin tool binaries are located
        on a network drive. To workaround this problem, install all Pin and
        Pin tool binaries on a local drive.

PinADX support

        Pin Advanced Debugging Extensions (PinADX) is now supporting
        Visual Studio 2012 up to Visual Studio 2017.

Additional information for using Pin on Linux*
===============================================

General issues

     There is a known problem of attaching pin to a running process on Linux systems that
     prevent the use of ptrace attach using the sysctl /proc/sys/kernel/yama/ptrace_scope.
     (There is no problem in launching an application with Pin with this limitation).
     To resolve this, set the kernel/yama/ptrace_scope sysctl to 0.

Additional information for using Pin on macOS*
===============================================

General issues

   o Pin must be run from either a developer account, or an administrator account.
   o If you’re running Pin on a GUI session – an authentication popup might be shown when Pin starts to work.
     This pop up will appear only once for the entire session.
   o If you’re running Pin on a non-GUI session (e.g. SSH only) then Pin might fail immediately.
     To fix this problem, you need to run 'sudo sbin/host_config'.
     sbin/host_config is located in the Pin kit.
   NOTE: The host_config utility program configures taskgated to allow signed executables that had requested the
     SecTaskAccess priviledge to run task_for_pid() on any process without going through the usual authentication
     popup.
     This configuration can be reset by running "sudo sbin/host_config --undo".
   o Pin ignores a ptrace command with PT_DENY_ATTACH request coming from the application.
     This means that if Pin launched an application and this application used PTRACE with PT_DENY_ATTACH flag, then:
     - Pin will be able to do detach/re-attach
     - A debugger will be able to attach to the application process and debug Pin/tool
     - Pin ADX will be able to attach to the application process and debug it while running under Pin
     Note: Pin is currently unable to attach to an application which already executed ptrace with PT_DENY_ATTACH request.
   o Note that if SIP (System integrity Protection) is an enabled on the machine then Pin will not be able to run
     system files. The only way to run system files will be to disable SIP on that machine.
     More information about SIP and how to disable it can be found online.
     - Some runtime functions may run indirectly system binaries which are SIP protected that Pin cannot run.
       Example for it is system() function which calls /bin/sh which is SIP protected.


******************************* Recent Changes *******************************

Changes added _After_ Pin 3.19 / 98424
===========================================
   o Added support for macOS 11 (Big Sur)
     - Currently without -follow_execv support 

Changes added _After_ Pin 3.18 / 98329
===========================================
   o AMX support - Added REG_TILECONFIG. Can be used with IARG_REG_REFERENCE/IARG_REG_CONST_REFERENCE
   o Removed REG_FPTAG_FULL from pin regs.
     REG_ConvertX87AbridgedTagToFull() can be used instead.
     - see Regvalue/fptag_conversion.test
   o Removed PIN_ReplayImageUnload from Pin API, use IMG_ReplayImageUnload instead
   o Removed PIN_ReplayImageLoad from Pin API, use IMG_ReplayImageLoad instead
   o Added safe implementation of the following functions to Pin-CRT
     strcat()   -> strcat_s()
     snprintf() -> snprintf_s()
     vsprintf() -> vsprintf_s()
     strtok()   -> strtok_s()
   o Added stat(), fstat() and lstat() functions to Pin-CRT. The stat family functions use to obtain information
     about a file, and it is now supported for all operating systems.
   o Removed Pin behavior of adding suffix for tools which are passed to Pin without extension. Users now
     must specify tool name with extension (i.e., ".so" in Linux, ".dylib" in macOS and ".dll" on Windows).  

Changes added _After_ Pin 3.17 / 98312
===========================================
   o Changed the behavior of INS_MemoryOperandCount to return the actual number of arch operands for vscatter/vgather
   o Changed the behavior of INS_MemoryOperandSize to be blocked with assert for vscatter/vgather
   o Deprecated INS_MemoryWriteSize and INS_MemoryReadSize
   o Added new function INS_HasScatteredMemoryAccess
   o Added new functions INS_MemoryOperandElementSize and INS_MemoryOperandElementCount
   o Removed INS_hasKnownMemorySize from Pin API
   o Initial support for Intel AMX (Advanced Matrix Extensions) architecture has been added.
     Added ability to examine a tile register in a tool.
     - Added tile registers enumeration.
     - Added support for IARG_REG_CONST_REFERENCE and IARG_REG_REFERENCE for tile registers.
       Note: Trying to read a tile register value when AMX is in init state (not in use) will 
             currently generate a #UD exception
     - No support for querying tile config at the moment.
     - No support for getting effective address for AMX instructions with memory operand at the moment.
     - Added INS_IsAmx() and REG_is_tmm() API.
     - Added PIN_WIDE_REGISTER which is a container for holding tile registers.
     - Currently not preserving tile registers when calling analysis routines.
       Note: It's the tool developer responsibility to make sure these registers are preserved 
             inside analysis routines unless the developer is interested in modifying them.
     - More support for AMX will be added in the future


Changes added _After_ Pin 3.16 / 98275
===========================================
   o Updated RTN_ReplaceProbed() API documentation with additional info to the user in order to
     guarantee that the stack is properly aligned for the analysis routine on 32bit Linux.
   o Added REG_ConvertX87FullTagToAbridged and REG_ConvertX87AbridgedTagToFull that convert from 
     16 bit version of FPU state tag register (fptag) to 8 bit version and
     vice versa, respectively.
   o For Linux systems with kernel 5.3 and above, branching to vsyscall area is treated like a regular system call.
     As a result, all system call callbacks (registered via PIN_AddSyscallEntryFunction() and PIN_AddSyscallExitFunction())
     are to be called, accordingly. Note that INS_IsSyscall() still returns false on instruction which branches to vsyscall. 

Changes added _After_ Pin 3.15 / 98253
===========================================
   o Pin now supports build of PinTools with only dynamic PinCRT on Windows.
     See detailed information in the Pin CRT documentation.
   o Pin redistribution policy was changed. All materials contained in the Pin kit may now be redistributed,
     subject to the Pin EULA. See the licensing directory for detailed info.

Changes added _After_ Pin 3.14 / 98223
===========================================
   o Pin now supports only 64 bits applications on macOS
   o Fixed the issue in which Pin wasn't able to run regular applications on SIP enabled machines.
     Note - Pin can't run system binaries protected by SIP.

Changes added _After_ Pin 3.13 / 98177
===========================================
   o Added support for macOS 10.15.
   o Starting from next release Pin will discontinue its support for 32 bits applications on macOS.
   o Added safe implementation of the following functions to Pin-CRT - 
     strncat() -> strncat_s()
     memcpy()  -> memcpy_s()
     strcpy()  -> strcpy_s()
     wcslen()  -> wcsnlen_s()
     strncpy() -> strncpy_s()
   o Added new API IMG_DynamicRawData that returns the raw data
     associated with a dynamic image.
   o Added INS_XedExactMapFromPinReg API that convert a Pin REG type
     to an Intel(R) X86 Encoder Decoder xed_reg_enum_t register.
   o INS_XedExactMapToPinReg(unsigned int r) is deprecated - use
     INS_XedExactMapToPinReg(xed_reg_enum_t xed_reg) instead.
   o Updated documentation about Pin support on SIP enabled macOS system inside "Additional information 
     for using Pin on macOS*" section (in this README file) and inside the User Guide.
   o Enable Pin to use files with network paths, like \\<network>\\<path> (Windows)

Changes added _After_ Pin 3.12 / 98018
===========================================
   o PinCRT now supports -faligned-new compiler flag (for GCC 7.X and newer) for dynamically allocated objects that 
     require alignment that is greater than the default of the system.
   o Changed KNOB::AddValue API behavior:
     - AddValue() now return true when it successfully changes the knob value, false otherwise.
     - SetByUser() returns true if the user set the knob from command line, false otherwise.
     - A knob of type KNOB_MODE_OVERWRITE that was set from command line cannot be altered from within the tool. 
       KNOB::AddValue() will return false if the tool tries to do it.
     Note: If the knob wasn't set from command line the tool can still set it as many times as it wants.
   o Starting from Linux kernel ~5.3.1 vsyscall area legacy code page (64 bit - ffffffffff600000-ffffffffff601000) will 
     be execute only. This means that the tool cannot instrument this page.
     Pin will maintain the control flow correctly.
   o Removed support for PinADX for Visual Studio 2010.
   o Implement JIT Profiling new API (ittnotify).
     Pin processes the dynamically generated ELF images created by the application.
     The JIT Profiling API headers are no longer provided by Pin, and need to be obtained
     from the open source project https://github.com/intel/ittapi .

Changes added _After_ Pin 3.11 / 98004
===========================================
   o Enabled JitProfiling feature on Windows.
   
Changes added _After_ Pin 3.10 / 97984
===========================================
   o Restored the PIN_PRODUCT_VERSION_MAJOR, PIN_PRODUCT_VERSION_MINOR and PIN_BUILD_NUMBER constants
     and added a new constant - PIN_COMMIT_HASH. See the Misc section in the user guide for details.
   o The following APIs and types have been removed:
     RTN_CodeRangesProbed
     RIN_AddProbesInsertedFunction
     PROBES_INSERTED_CALLBACK
     PROBES_INSERTED_CALLBACKVAL
     PROBES_INSERTED_CALLBACKFUNS
     
Changes added _After_ Pin 3.9 / 97939
===========================================
   o Added a new API to retrieve dynamic functions Method Id attribute: RTN_DynamicMethodId.
     This method is applicable for the JitProfiling feature.
   o Added a new API, PIN_Version, which returns a string containing the Pin version.

Changes added _After_ Pin 3.8 / 97903
===========================================
   o Pin's license was changed to the End User License Agreement for the Intel(R) Software Development Products,
     non-commercial type. The license can be found in <installdir>/licensing/EULA.txt. Please review the licensing directory
     for more information.

Changes added _After_ Pin 3.7 / 97720
===========================================
   o The following APIs which have been deprecated for a long time have been removed:
     PIN_RegisterItcAuxCallBackPushFun
     RTN_ReplaceWithUninstrumentedRoutine          - See RTN_Replace and RTN_ReplaceProbed
     RTN_ComplexReplaceWithUninstrumentedRoutine
     PIN_FindLineFileByAddress                     - See PIN_FindColumnLineFileByAddress
     PIN_FindColumnLineFileByAddress               - See PIN_GetSourceLocation
   o Adding new IMG API:
     BOOL IMG_HasProperty(IMG img, IMG_PROPERTY property)
     This API can be used to query various properties defined as meta data in the image.
     Currently this API supports only CET properties for Linux only (for compiled code
     with -fcf-protection=[full|branch|return|none]).
   o IMG_Entry() is deprecated - use IMG_EntryAddress() instead.
   o A new Instruction Generic Inspection API function: INS_IsControlFlow.
     See its documentation for more details, note that it excludes system calls.
   o New functions to check if instrumentation at a certain IPOINT is available:
     - INS_IsValidForIpointTakenBranch - prior to instrumentation at
     IPOINT_TAKEN_BRANCH, you should verify that this function returns true.
     Previously, this check was done by INS_IsBranchOrCall.
     - INS_IsValidForIpointAfter - prior to instrumentation at IPOINT_AFTER,
     you should verify that this function returns true.
     Previously, this check was done by INS_HasFallThrough.
   o The function INS_IsBranchOrCall has been deprecated. You can choose an
     alternative function according to the required usage:
     - To check if instrumentation at IPOINT_TAKEN_BRANCH is available, use the
     function INS_IsValidForIpointTakenBranch.
     - To check if an instruction is a branch or a call instruction, use the
     combination (INS_IsBranch || INS_IsCall).
     - To check if an instruction is in general a control-flow instruction, use
     the new function INS_IsControlFlow (see documentation for details).
   o The function INS_IsBranch was updated to exclude system calls that are
     implemented by branch instructions (e.g. JMP_FAR with selector 0x33 in
     Windows on IA-32).
   o The function INS_IsCall was updated to exclude system calls.
   o The following functions' names were changed (old names are deprecated):
      --- old function's name ---              --- new function's name ---
      INS_IsDirectBranchOrCall             ->  INS_IsDirectControlFlow
      INS_IsIndirectBranchOrCall           ->  INS_IsIndirectControlFlow
      INS_CallOrBranchIsRegisterIndirect   ->  INS_IsIndirectControlFlowViaRegister
      INS_CallOrBranchIsMemoryIndirect     ->  INS_IsIndirectControlFlowViaMemory
      INS_CallOrBranchGetIndirectRegister  ->  INS_GetIndirectControlFlowRegister
      INS_DirectBranchOrCallTargetAddress  ->  INS_DirectControlFlowTargetAddress
      ** There is no functionality change, simply renaming of the old functions
      to keep consistency and compliance with other changes.
    o passing IARG_BRANCH_TARGET_ADDR to an analysis routine is only allowed if
      INS_IsControlFlow is true. However, passing this argument to an analysis
      routine will not work for XBEGIN and XEND instructions.
    o passing IARG_FALLTHROUGH_ADDR to an analysis routine is only allowed if
      INS_HasFallThrough is true.
    o Locking primitives such as PIN_SEMAPHORE and PIN_MUTEX requires cache line 
      (64byte) alignment for performance reasons. It is advisable to use aligned
      allocation for these primitives. Note that new compiler (e.g. gcc >= 7.3) 
      may produce warning if aligned allocation is not used.

Changes added _After_ Pin 3.7 / 97619
===========================================
   o Enabled PinADX (Pin Advanced Debugging Extensions) on macOS (See user guide for more details)
   o The following APIs which have been deprecated for a long time have been removed:
     const VARIABLE_MEMORY_REFERENCE_SIZE is no longer defined
     INS_IsRewritableMemOpBaseLimited              - See INS_RewriteMemoryOperand
     INS_IsDynamicRewritableMemOpBase              - See INS_RewriteMemoryOperand
     INS_IsRewritableMemOpBase                     - See INS_RewriteMemoryOperand
     INS_MemoryOffset                              - See INS_MemoryDisplacement
     INS_MemoryDisplacementSigned                  - See INS_MemoryDisplacement
     ParseCommandLine                              - See the return value from PIN_Init
     INS_OperandReadAndWriten                      - See INS_RewriteMemoryOperand
     RTN_No                                        - See RTN_Id
     PIN_StartProbedProgram                        - See PIN_StartProgramProbed
     PIN_AddSignalBeforeFunction                   - See PIN_AddContextChangeFunction
     PIN_AddSignalAfterFunction                    - See PIN_AddContextChangeFunction
     PIN_AddSignalInterceptFunction                - See PIN_InterceptSignal and PIN_UnblockSignal
     PIN_AddThreadBeginFunction                    - See PIN_AddThreadStartFunction
     PIN_AddThreadEndFunction                      - See PIN_AddThreadFiniFunction
     RTN_IsSafeForProbe                            - See RTN_IsSafeForProbedInsertion
     PIN_FindAlternateAppStack
     RTN_BblHead                                   - See RTN_InsHead
     RTN_BblTail                                   - See RTN_InsTail
     INS_ChangeMemOpToBaseRegisterAddressMode      - See INS_RewriteMemoryOperand
     INS_RewriteMemoryAddressingToBaseRegisterOnly - See INS_RewriteMemoryOperand
     CODECACHE_InvalidateRange                     - See PIN_RemoveInstrumentationInRange
     CODECACHE_InvalidateTraceAtProgramAddress     - See PIN_RemoveInstrumentationInRange
     CODECACHE_FlushCache                          - See PIN_RemoveInstrumentation
     TRACE_Original
   o Enable dynamic linking of Pin tools with PinCRT on Windows.
     An example is available in the MyPinTool directory.
   o Removed "using namespace std;" from Pin header files. 
   o Printing unmangled names in stack trace (on assert).
   o Main bug fixes:
      o Compilation error when building a PinTool with gcc version 7.0 or newer.
      o Running child process natively if Pin fails on follow child due to permissions.
      o Issue with Pin warning messages not being displayed.
      o MyPinTool Visual Studio solution is broken (https://groups.io/g/pinheads/message/12634,
        https://groups.io/g/pinheads/message/12763)
      o Application extended state gets corrupted after Pin_Detach (https://groups.io/g/pinheads/message/12593)
        (Fixed on macOS)
      o Potential key duplication with PIN_CreateThreadDataKey
      o Potential wrong result from PIN_CheckWriteAccess
      o Performance penalty caused by AVX-SSE transitions in Probe mode
      o Better handling long paths in Pin command line on Windows.
      o Application forked child process output is written to pin log file on macOS
   
Changes added _After_ Pin 3.6 / 97575 
===========================================
   o macOS* - Pin now ignores a ptrace command with PT_DENY_ATTACH request coming from the application.
     This means that if Pin launched an application and this application used PTRACE with PT_DENY_ATTACH flag, then:
     - Pin will be able to do detach/re-attach
     - A debugger will be able to attach to the application process and debug Pin/tool
     - Pin ADX will be able to attach to the application process and debug it while running under Pin
     Note: Pin is currently unable to attach to an application which already executed ptrace with PT_DENY_ATTACH request.
   o The APIs: CALLBACK_SetExecutionPriority, CALLBACK_GetExecutionPriority were deprecated and
      replaced with CALLBACK_SetExecutionOrder, CALLBACK_GetExecutionOrder.

Changes added _After_ Pin 3.3 / 83088
===========================================
   o The knob -version_long has been removed.

Changes added _After_ Pin 3.2 / 81205
===========================================
   o Support for Android has been discontinued.
   o The opmask registers (REG_K*) are no longer valid for IARG_REG_VALUE.
   o The IARG_G_* IARGs, which have been deprecated for a very long time, have been completely removed.
     Please use IARG_FUNCARG_* and IARG_FUNCRET_* instead.
   o The IARG_SYSCALL_ARG* IARGs, which have been deprecated for a very long time, have been completely
     removed. Please use IARG_SYSARG_* instead.
   o Added a new API, PIN_RemoveInstrumentationInRange, which removes all instrumentation in the given
     range. See the user guide for further details.
   o The IA64-only IARGs, IARG_REG_OUTPUT_FRAME_VALUE and IARG_REG_OUTPUT_FRAME_REFERENCE, have been
     removed. 
   o Changes to the CODECACHE API:
     The following functions were deprecated:
       - CODECACHE_FlushCache - use PIN_RemoveInstrumentation instead.
       - CODECACHE_InvalidateTraceAtProgramAddress - use PIN_RemoveInstrumentationInRange instead.
       - CODECACHE_InvalidateRange - use PIN_RemoveInstrumentationInRange instead.
       - TRACE_Original - always returns TRUE.
     All other functions with the CODECACHE prefix were removed.
     The following functions were also removed:
       - INS_CodeCacheAddress, INS_CodeCacheSize
       - BBL_CodeCacheSize, BBL_CodeCacheAddress
       - TRACE_CodeCacheAddress, TRACE_CodeCacheSize
       - PIN_MemoryAllocatedForPin
   o Added a new API, PIN_CreateDefaultConfigurationInfo, which creates an instance of
     PIN_CONFIGURATION_INFO containing default configuration values.
   o Changed PIN_StartProgram to accept an additional argument: an instance of PIN_CONFIGURATION_INFO
     that applies to the current run of Pin.
   o Added a new API, PIN_SetAllowedConcurrentCallbacks, which can be used to change the types of Pin
     callbacks that are allowed to be delivered concurrently.
   o Symbol resolution on Windows is done with the msdia120.dll that is distributed with the kit.
     The 64 bit and 32 bit versions of this biary from Microsoft SDK have been added to the kit.

Changes added _After_ Pin 3.2 / 79375
===========================================
   o Added a utility program sbin/host_config to Pin's macOS* kit.
     This program configures Pin to have the necessary permissions to run non-interactively.
   o Added Pin API: INS_IsCacheLineFlush() - API to classify instructions that cause cache line flush.

Changes added _After_ Pin 3.1 / 76225
===========================================
   o On Windows, Pintools are no longer required to be compiled with /D_SECURE_SCL=0.
   o A Pin enabled libunwind library was introduced. This library can be linked and used
     in a Pin tool.
   o Added equivalent implementation for glibc's backtrace functions:
     backtrace(), and backtrace_symbols().
   o Added Pin API: PIN_Backtrace() - Similar to backtrace() but generates a backtrace for the
     instrumented application instead of a native backtrace for the Pin tool.
   o Added Pin API: PIN_GetInitialContextForUnwind() - Equivalent to unw_get_context() but retrieves
     the instrumented application context instead of the native context.

Changes added _After_ Pin 3.0 / 73178
===========================================
   o The Intel(R) XED kit is no longer distributed with the Pin kit. To download Intel(R) XED please
     visit http://www.intel.com/software/xed
   o Pin can now run in launch mode even in Linux environments where /proc/sys/kernel/yama/ptrace_scope
     is set to 1, limiting use of ptrace.
   o New APIs PIN_AddSmcDetectedFunction and PIN_SetSmcSupport were added, for more control of how Pin
     supports self-modifying-code.
   o Enhanced IARG_MEMEORYWRITE_SIZE and IARG_MEMORYREAD_SIZE to support XSAVE, XSAVEC, XSAVEOPT and XRSTOR
     instructions which have variable length memory size.
   o Added user API INS_hasKnownMemorySize to check if user can use safely the IARG_MEMORYWRITE_SIZE and the 
     IARG_MEMORYREAD_SIZE
   o New APIs PIN_AddThreadAttachFunction and PIN_AddThreadDetachFunction were added for Linux.
     These allow a Pin tool to get a callback for each thread when Pin attaches/detaches from the application. 
   o Added PIN_Attach() to support re-attach in JIT mode (currently only implemented on Linux).

Changes added _After_ Pin 2.14 / 71313
===========================================
   o The APIs PIN_AddFiniUnlockedFunction() and PIN_IsProcessExiting() were removed.
     Added callback type PREPARE_FOR_FINI_CALLBACK and Pin API function
     PIN_AddPrepareForFiniFunction(). Refer to ToolUnitTests/mt_tool.test for sample.
   o The APIs GetVmLock and ReleaseVmLock were removed.
   o Added PIN_GetAuxVectorValue() API, which queries aux vector values passed to the application.
     This API is available in Linux and Android. Refer to auxv_query_jit.test and auxv_query_probe.test
	 samples in AttachDetach.
   o Intel(R) XED and pindwarf are now linked dynamically to Pin and tools on all Unix platforms.
     The static library versions are no longer distributed with the Pin kit.
   o Pin no longer uses the system runtime, but rather a new runtime, PinCRT, which is distributed with the
     Pin kit. Pin tools are also required to link and use this new runtime. For further details please see
     the "Additional information for PinTool writers" and "Restrictions" sections above.

Changes added _After_ Pin 2.14 / 67254
===========================================
   o Added support for debug information placed in a separate file.
     See example "get_source_location_gnu_debug.test" under SimpleExamples.
   o RTN_Id now returns UINT32 instead int. PinTools have been updated accordingly.
   o When using INS_InsertCall() on non-standard memory instructions (e.g. XSAVE) with inappropriate
     memory operands related IARGs PIN will generate an error.
     Note that some IARGs (e.g. IARG_MULTI_MEMORYACCESS) will still work on specific non-standard memory
     instructions with vector arguments (VGATHER/VSCATTER in the case of IARG_MULTI_MEMORYACCESS).
   o Added INS_IsStandardMemop(INS) which returns FALSE for non-standard memop instructions.
   o Added PIN_IsThreadStoppedInDebugger(THREADID) which returns TRUE if the thread denoted by the
     THREADID is currently stopped inside the debugger (when using PIN ADX).
   o PIN_CallApplicationFunction() now accepts additional argument which
     specifies how PIN should behave when invoking the application function.
     Using this argument allows the user to specify that he wants to invoke
     the application function without instrumenting it.
   o The following APIs were removed: SYM_OriginatedFromIFunc, SYM_IFunc. 
   o The following APIs were added: RTN_IFuncResolver, RTN_IFuncImplementation, SYM_IFuncImplementation, SYM_IFuncResolver, SYM_GeneratedByPin
   o When RTN_FindByName is called on an IFunc (such as gettimeofday, memcpy) the returned RTN is that of the ifunc implementation.
     One may obtain the resolver RTN (and instrument it as well) by calling RTN_IFuncResolver(). 
     Note that the ifunc implementation may not reside in the same IMG as originally searched.

Changes added _After_ Pin 2.13 / 65163
===========================================
   o Added a new command line option, -appdebug_server_port, for requesting a specific port for gdb to listen on
     when debugging the application (using the Pin advanced debugging extensions).
   o Added a new IARG, IARG_EXPLICIT_MEMORY_EA, for getting the effective address of an explicit memory operand.
     For example, this can be used for getting the address of an LEA instruction.
   o All callback registration functions (e.g. PIN_AddThreadStartFunction()) are now returning a PIN_CALLBACK
     instance that can later be used with CALLBACK_SetExecutionPriority() to control the order of execution
     between all registered callbacks of the same kind.
   o Added a new knob "-cc_memory_range". This knob enables the user to specify the memory address range(s) where
     PIN should allocate its code cache regions. Note that this doesn't mean that PIN will allocate all of the
     specified ranges but instead this knob just ensures that if PIN will allocate a code cache region then it
     will be allocated in one of the specified regions.
     If "-cc_memory_range" knob wasn't specified but "-pin_memory_range" was, then code cache regions will be
     allocated inside the regions specified in the "-pin_memory_range" knob.
   o Added a new knob "-restrict_memory". This knob enables the user to restrict several memory regions
     from PIN's image loader. This means that PIN will not load any image in the address ranges specified by
     this knob.
   o Added a new knob "-pin_memory_size". This knob enbales the user to specify a hard limit of dynamic memory
     that can be allocated by PIN and PIN tool (in bytes). When this limit exceeds, an out of memory condition
     occurs.
   o The knob "-limit_code_cache" was renamed to "-cc_memory_size" to align with the naming convention
     introduced by the newly added knob "-pin_memory_size".

Changes added _After_ Pin 2.13 / 62732
===========================================
   o Support for Android Ice Cream Sandwich (4.0) has been deprecated.
   o Support for Android Kit Kat (4.4) has been added.
   o Added support for split images i.e. the image segments are loaded in non-consecutive memory regions.
     The IMG_LowAddress and IMG_HighAddress were updated and three new APIs were added: IMG_NumRegions,
     IMG_RegionLowAddress and IMG_RegionHighAddress. See the user guide for further details.
   o Added a new API, PIN_GetInitialThreadCount, for obtaining the number of threads during attach.

Changes added _After_ Pin 2.13 / 61206
===========================================
   o Ifunc support for Linux has been added.
   o A new API, SYM_OriginatedFromIFunc, has been added, which indicates if a SYM originated from an ifunc symbol.
   o Removed the REGVAL struct and matching APIs. PIN_GetContextRegval and PIN_SetContextRegval accept UINT8* as the
     value argument. The user must ensure that the UINT8* pointer points to a valid buffer which is large enough to
     contain the requested register value. See SimpleExamples/regval.cpp for a typical usage example.
   o Two deprecated APIs were re-enabled: PIN_SetContextFPState and PIN_GetContextFPState. These APIs provide access
     to the entire floating point state via the FPSTATE type.
   o Support for QEmu Android devices has been added.
   o Support for PIN_GetSourceLocation has been added on Android and macOS*. 
   o Added support for VS2012 - Added a kit for VS2012, tools can now be compiled with VS2012 when using the new kit. 

Changes added _After_ Pin 2.13 / 59453
===========================================
   o Two new APIs, PIN_CheckReadAccess and PIN_CheckWriteAccess, have been added.
     These APIs give the tool information about the read and write access protection of a memory page respectively. 
     Please refer to the user guide for additional information.
   o Support for Android Jelly Bean (Android 4.1) has been added.
   o Support for Android Honeycomb (Android 3.0) has been deprecated.

Changes added _After_ Pin 2.12 / 58423
===========================================
   o Lock APIs (InitLock, GetLock, ReleaseLock) were renamed, with a PIN_ prefix added to each function name.

Changes added _After_ Pin 2.12 / 56759
===========================================
   o New APIs were added which allow the tool to manipulate registers of any size. Please refer to the user
     guide, section REGVAL, for additional information. See SimpleExamples/regval.cpp for a typical usage
     example. For more complex examples, including CONTEXT modification, see the tests in the Regvalue
     directory.
   o Internal lock usage in Pin APIs is documented.
   o New APIs were added which allow the tool to stop, examine and resume application threads. Please refer
     to the user guide, section STOPPED_THREAD, for additional information.

Changes added _After_ Pin 2.12 / 54730
===========================================
   o The PinTools makefile infrastructure has been changed. It is now simpler to use and to modify.
     For detailed information, read the documentation in source/tools/Config/makefile.config.
   o Nmake is no longer supported on windows. Either use make or the example vcproj file in the
     MyPinTool directory.
   o Android support has been added. An Android tutorial is avaliable at: <android-kit-root>/AndroidTutorial. 
   o The directory tree under <pinkit>/source/include has been changed, the include files are now located at: 
     <pinkit>/source/include/pin and <pinkit>/source/include/pin/gen. 

Changes added _After_ Pin 2.12 / 53271
===========================================
   o A new API, PIN_AddThreadDetachProbedFunction, has been added on Linux. This allows the tool to receive
     a per-thread callback before each application thread is about to detach in probe mode. Please refer to
     the user guide for additional information.
   o The kit naming convention was changed: 
     The kit name no longer includes the architecture type, the architecture will be implicitly defined by
     the platform of the kit. 
     For example: pin-2.12-53271-gcc.4.4.7-intel64_ia32-linux is now called pin-2.12-53271-gcc.4.4.7-linux.

Changes added _After_ Pin 2.11 / 49306
===========================================
   o Pin is now compiled with gcc 4.4.7 on Linux.
   o The Linux Pin kit runtime directory structure has changed: libstdc++ and libgcc_s have moved from:
     "intel64/runtime" to a new directory: "intel64/runtime/cpplibs" (and ia32 equivalent). The kit comes
     with these two libraries already installed and the tools' build process (makefile configuration) will
     automatically choose whether to link/run with them or not, depending on the compiler being used.
   o Updated versions of libelf.so and libelf.a are available in the Pin package.
   o Pin is now launched using a c-based program instead of the previously used scripts. The sources for
     this launcher are available at <pinkit>/source/launcher-example.c

Changes added _After_ Pin 2.11 / 45931
===========================================
   o An updated version of libdwarf.so is available in the Pin package. This version is compatible with the
     latest gcc version. See the EXTLICENSE file for more details.
   o The thread fini callbacks and buffer callbacks may now be called on a different physical thread than
     the one that is exiting.
   o The PIN_GetThreadData and PIN_SetThreadData APIs may now access the TLS of a different thread than the
     calling thread by using the version of these APIs which takes a THREADID argument. The versions that do
     not take the THREADID argument are now deprecated.

Changes added _After_ Pin 2.10 / 45467
===========================================
   o The THREAD_ATTACH_PROBED_CALLBACK callback was changed. It now enables the tool to receive the thread's
     signal mask at the attach point and to modify it.
   o Changed the default behavior when pin injection to child process fails. In case that pin injection 
     to a child process fails, the child process wouldn't terminate. Instead, it would run natively
     (without instrumentation).

Changes added _After_ Pin 2.10 / 43611
===========================================
   o New APIs have been added to synchronize between threads.  See PIN_MUTEX, PIN_RWMUTEX,
     and PIN_SEMAPHORE.
   o Added a new knob "-tool_load_option". This knob enables the user to specify additional options
     for loading the tool. See the manual for more details.

Changes added _After_ Pin 2.10 / 41150
===========================================
   o The Pthread example tool directory was removed from the example tools.
   o On Windows, dbghelp.dll is now included with the Pin kit. There's no need to manually
     download and install dbghelp.dll.
   o The API "INS_MemoryDisplacementSigned" is now deprecated. The two APIs,"INS_MemoryDisplacement" 
     and "INS_OperandMemoryDisplacement", have been changed to return the memory displacement as
     ADDRDELTA. This means signed 32 bits value on IA32 and signed 64 bits value on 64 bits.
    
Changes added _After_ Pin 2.9 / 40272
===========================================
   o Guidelines for avoiding deadlocks in multi-threaded applications were 
     added to the "How to Instrument with Pin" section of the Pin User Guide.
   o Application level debugging API has been added. This API allows the user to debug the application
     that is running on top of Pin. It also allows a tool to interact with the debugger and provide
     extended commands to the debugger.

Changes added _After_ Pin 2.9 / 39501
===========================================
   o The "use_dynsym" knob is now deprecated. On Linux, when invoking PIN_InitSymbols or
     PIN_InitSymbolsAlt, both the SYMTAB and the DYNSYM tables will be processed.
     This change does not affect Windows.
   o Added a new PIN_ERRTYPE - PIN_ERR_ACCESS_DENIED. This type signifies that an access to a file was denied
     due to bad permissions.
   o The API "RTN_No" is now deprecated. A new API "RTN_Id" has been added to replace it. The function returns
     a unique Id for the RTN. The Id is globally unique i.e. an Id will not appear in two images. When
     unloading and reloading an image, it is most likely that a RTN will receive a different Id.

Changes added _After_ Pin 2.8 / 39028
===========================================
   o On Linux, Pin allows tools to see an instrument IFUNC symbols.
     To enable this feature the tool needs to call PIN_InitSymbolsAlt(SYMBOL_INFO_MODE mode)
     with the IFUNC_SYMBOLS flag set.
     Use the new API SYM_IFunc(SYM x) to find if a given symbol is an IFUNC symbol.

   o On Windows*, Pin supports tools built with Intel(R) C++ compiler 10.1 and 11.1 .

Changes added _After_ Pin 2.8 / 37832
===========================================
   o On Linux, Pin is now checking the sysctl /proc/sys/kernel/yama/ptrace_scope and providing
     relevant error message in case it is set to '1'.
     See the "Additional information for using Pin on Linux*" section for more information.
     
   o On Linux, the following changes have been made for IMG and SEC objects used inside image-load callback. 
     While parsing the image Pin maps the whole image into store before calling the image-load callback. 
     Pin now umaps this copy of the file after the image-load callback returns to reduce memory use. 
     The addresses provided by IMG_StartAddress() and SEC_Data() point into the mapped image file and are 
     therefore only valid inside the image-load callback or after IMG_Open().
     
   o A new API, PIN_ExitApplication, was added. This API terminates the current process after calling the 
     relevant thread and process exit callbacks.
     
   o A new API, RTN_InsHeadOnly, was added. This API provides a faster alternative to RTN_InsHead for tools 
     that want to examine only the first INS of an RTN.
     
New Features added _After_ Pin 2.8 / 37300
==========================================
   o The FPSTATE type used by the API's PIN_GetContextFPState() and PIN_SetContextFPState()
     has changed slightly.  The "_st" and "_xmm" fields have been renamed and redefined
     to better expose the structure of these FP registers.  Code that refers to these
     fields will fail to compile (because the field names have changed), and authors will
     need to port to the new layout.

   o If you build Pin tools _without_ using the makefile or VS project file provided in
     the Pin kit, you will need to add the following directory to the #include search path:

        <pinkit>/extras/components/include

New Features added _After_ Pin 2.8 / 37081
==========================================
   o The Pin User Guide was updated with a list of Pin deprecated APIs and their
     replacements.

New Features added _After_ Pin 2.8 / 36909
==========================================
   o Pin tools are now encouraged to dynamically link with libelf and libdwarf.
     Tools should link with the Pin-compatible versions of libelf.so and libdwarf.so that were
     added to the Pin package.
   
   o PIN_UndecorateSymbolName() was reimplemented without using libiberty. 
     The libiberty.a library was removed from the Pin package. Pin tools no longer need to
     link with this library.

New Features added _After_ Pin 2.8 / 36111
==========================================
   o PIN_RemoveInstrumentation() now removes all instrumentation but
     does not remove the saved ahead-of-time intrumentation requests, so
     they will be re-applied if instructions which they targeted are
     re-executed. This is consistent with its behavior for JIT
     instrumentation; instrumentation callbacks continue to be made
     after PIN_RemoveInstrumentation() has been called.
     Previously PIN_RemoveInstrumentation() also cleared the saved
     ahead-of-time intrumentation requests, so they would not be re-applied.

New Features added _After_ Pin 2.8 / 33199
==========================================
   o The ability to debug 64-bit Pin tools on Linux has been somewhat improved.  GDB
     will now normally find the tool's shared libraries, which allows you to debug
     crashes that occur when calling into a library.

New Features added _After_ Pin 2.7 / 31933
==========================================
   o Pin allows tools to create their own internal, non-instrumented threads. The
     following APIs have been added to support this feature:
      PIN_SpawnInternalThread() - Create a new internal thread
      PIN_ExitThread() - Terminate the current internal thread
      PIN_WaitForThreadTermination() - Wait until the thread terminates and return exit code
      PIN_IsApplicationThread() - Check the type of the thread (application's or internal)
      PIN_Sleep()   - Delay the calling thread for the specified time interval
      PIN_Yield()   - Yield the processor to another thread
      PIN_ThreadUid() - Get unique (not reusable) identifier of the current thread in Pin.
      PIN_IsProcessExiting() - Tool's threads should periodically call this function to check 
                               if the application is about to exit.
      PIN_AddFiniUnlockedFunction() - Yet another method to terminate tool's threads gracefully
                                      when the process is about to exit.
    Many Pin APIs, that are primarily intended for application's threads, are also available in 
    internal threads. Look at the API's description or the description of the corresponding 
    group of APIs to check whether specific API is available in internal threads.
     
   o A new API, PIN_InsertCallProbed was added. This API is used to insert a call to a
     notification routine before a specific instruction.  To guarantee safe usage of
     this API the required location must have a single instruction that follows the
     following restrictions:
     - The size of the instruction is at least 5 bytes (in IA32) or 7 bytes (in Intel64).
     - The instruction is not a control flow instruction.
     - The instruction has no memory operand.
     If the location is prepared in advance to be used with this API, the user can put
     a large size NOP instruction that always follows the above restrictions.

     There is also a new API, PIN_IsSafeForProbedInsertion, to check if the location is
     safe for inserting call (i.e. it follows the restrictions of PIN_InsertCallProbed).

New Features added _After_ Pin 2.7 / 29972
==========================================
   o PIN_UndecorateSymbolName() is supported now on Linux and FreeBSD. Pin tools should be statically
     linked with libiberty.a library, which became a part of Pin package like libelf and libdwarf.

   o Internal exception handling support was added on Windows. The new supported APIs are
     PIN_AddInternalExceptionHandler(), PIN_TryStart(), PIN_TryEnd(), PIN_SetPhysicalContextReg(),
     PIN_GetPhysicalContextReg(), PIN_SetPhysicalContextFPState(), PIN_GetPhysicalContextFPState().
     These APIs allow the user to be notified upon internal exception (generated by pin / tool) and
     handle it. If the exception was generated unintentionally, it may indicate about a bug in pin / tool.

   o A new version of dbghelp is needed on Windows*.  For more information see the
     "Additional Information for Using Pin on Windows*" section.

   o There is a new API PIN_RaiseException() that allows a tool to emulate an exception
     into the application.

   o New APIs are provided to allow tools more easily to iterate over the memory operands
     of an instruction without having to explicitly check for odd cases such as the READ2
     operand of SCAS. The examples such as ManualExamples/pinatrace.cpp have been
     rewritten to use the new interface.

New Features added _After_ Pin 2.6 / 27887
==========================================
   o On Windows, Pintools must be compiled with /D_SECURE_SCL=0.  Please see the User's
     Guide for more information on mandatory compiler and linker swtiches.

   o Pin on Windows* now supports "early injection". The injection occurs right after 
     kernel32.dll is loaded and initialized. This allows Pin to instrument 
     DllMain(fdwReason=DLL_PROCESS_ATTACH) of the rest of the implicitly loaded DLLs.
     The injection occurs when the application's loader is active and the system's loader 
     lock is acquired.

   o Pin on Windows* in Probe mode supports attach to a running process (using -pid 
     command line switch).

   o Pin on Windows* in Probe mode supports lite detach & reattach. 
     The new supported APIs are: PIN_AddDetachFunctionProbed(), PIN_DetachProbed(), 
     PIN_AttachProbed(). The -detach_reattach command line switch must be specified in 
     order to enable the feature.

   o In order to perform "early injection", attach, lite detach & reattach, Pin on Windows* 
     uses the debugging APIs.  Therefore, you must attach with a debugger *after* the Pin 
     injection takes place (In particular, don't enable the Windbg* "Debug child processes also" 
     button). Pin's -debug_instrumented_processes command line switch can be used 
     in order to get a message that debugger attach can be done.

   o The treatment of REP prefixed instructions in the IA-32 and Intel(R) 64 architectures has
     been changed. REP prefixed instructions are now treated as implicit loops, with
     IPOINT_BEFORE and IPOINT_AFTER instrumentation called before each iteration. This will
     affect instruction counts. PinTools/InstLib/icount.H shows how to collect an instruction
     count which only counts a REP prefixed instruction once, as Pin used to do.

   o The Pin User Manual now includes a section on optimizing the treatment of REP prefixed
     instructions.

   o As a result of the changes to REP prefixed instruction handling,
     VARIABLE_MEMORY_REFERENCE_SIZE has been deprecated. No instructions now have a
     variable memory reference size, so code which expected that can probably be removed from
     your tools.

   o On the IA-32 and Intel(R) 64 architectures CMOVcc, FCMOVcc and REP prefixed instructions
     are now treated as predicated.

   o Pin tools which use the REG_INST_Gn registers should consider using the new function
     PIN_ClaimToolRegister() to allocate them to avoid conflicts if you want to integrate
     multiple tools.


New Features added _After_ Pin 2.6 / 25945
==========================================
   o Support for a new buffering API has been added for IA-32 and Intel(R) 64 architectures.
     This allows a tool to write data to a buffer for processing.  See PIN_DefineTraceBuffer() 
     for more information.

******************************************************************************


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