Intel® Parallel Studio XE 2018 Composer Edition C++ - Debug Solutions Release Notes

Known Issues and Limitations

No call-stack

There is currently no provision for call-stack display. This will be addressed in future version of the debugger.

Un-interruptible threads

Due to hardware limitations it is not possible to interrupt a running thread. This may cause intermittent side-effects while debugging, where the debugger displays incorrect register and variable value for these threads. It might also show up as displaying SIGTRAP messages when breakpoints get removed while other threads are running.

Evaluation of expressions with side-effects

The debugger does not evaluate expressions that contain assignments which read memory locations before writing to them (e.g. x = x + 1). Please do not use such assignments when evaluating expressions.

Known Issues and Limitations

• Using conditional breakpoints for offload sections might stall the debugger. If aconditional breakpoint is created within an offload section, the debugger might hang when hitting it and evaluating the condition. This is currently analyzed and will be resolved in a future version of the product.
• Data breakpoints are not yet supported within offload sections.
• Disassembly window cannot be scrolled outside of 1024 bytes from the starting address within an offload section.
• Handling of exceptions from the Intel® MIC Architecture application is not supported.
• Changing breakpoints while the application is running does not work. The changes will appear to be in effect but they are not applied.
• Starting an Intel® MIC Architecture native application is not supported. You can attach to a currently running application, though.
• The Thread Window in Microsoft Visual Studio* offers context menu actions to Freeze, Thaw and Rename threads. These context menu actions are not functional when the thread is on an Intel® Xeon Phi™ coprocessor.
• Setting a breakpoint right before an offload section sets a breakpoint at the first statement of the offload section. This only is true if there is no statement for the host between set breakpoint and offload section. This is normal Microsoft Visual Studio* breakpoint behavior but might become more visible with interweaved code from host and Intel® Xeon Phi™ coprocessor. The superfluous breakpoint for the offload section can be manually disabled (or removed) if desired.
• Only Intel® 64 applications containing offload sections can be debugged with the Intel® Debugger Extension for Intel® Many Integrated Core Architecture.
• Stepping out of an offload section does not step back into the host code. It rather continues execution without stopping (unless another event occurs). This is intended behavior.
• The functionality “Set Next Statement” is not working within an offload section.
• If breakpoints have been set for an offload section in a project already, starting the debugger might show bound breakpoints without addresses. Those do not have an impact on functionality.
• For offload sections, setting breakpoints by address or within the Disassembly window won’t work.
• For offload sections, using breakpoints with the following conditions of hit counts do not work: “break when the hit count is equal to” and “break when the hit count is a multiple of”.
• The following options in the Disassembly window do not work within offload sections: “Show Line Numbers”, “Show Symbol Names” and “Show Source Code”
• Evaluating variables declared outside the offload section shows wrong values.
• Please consult the Output (Debug) window for detailed reporting. It will name unimplemented features (see above) or provide additional information required to configuration problems in a debugging session. You can open the window in Microsoft Visual Studio* via menu Debug->Windows->Output.
• When debugging an offload-enabled application and a variable assignment is entered in the Immediate Window, the debugger may hang if assignments read memory locations before writing to them (for example, x=x+1). Please do not use the Immediate Window for changing variable values for offload-enabled applications.
• Depending on the debugger extensions provided by Intel, the behavior (for example, run control) and output (for example, disassembly) could differ from what is experienced with the Microsoft Visual Studio* debugger. This is because of the different debugging technologies implemented by each and should not have a significant impact to the debugging experience.

Attributions

This product includes software developed at:

GDB – The GNU* Project Debugger

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This program is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

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