Detect device-side exceptions on the host.

[maleadt]

Very WIP.

[codecov]

Codecov Report

Attention: Patch coverage is 9.09091% with 30 lines in your changes missing coverage. Please review.

Project coverage is 33.18%. Comparing base (5355310) to head (e2799dd).

Files with missing lines	Patch %	Lines
src/compiler/exceptions.jl	13.04%	20 Missing ⚠️
src/compiler/execution.jl	0.00%	9 Missing ⚠️
src/compiler/compilation.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #342       +/-   ##
===========================================
- Coverage   78.53%   33.18%   -45.36%     
===========================================
  Files          12       12               
  Lines         671      660       -11     
===========================================
- Hits          527      219      -308     
- Misses        144      441      +297     

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[maleadt]

Seems like this exposes additional bugs in PoCL. Works fine on Intel...

julia> function kernel()
         OpenCL.@println "Will error"
         error("told ya")
         return
       end

julia> cl.platform!("intel")
OpenCL.Platform('Intel(R) OpenCL Graphics' @0x00000000357af420)

julia> @opencl kernel();
Will error

julia> cl.finish(cl.queue());
ERROR: KernelException: exception thrown during kernel execution on device(s) Intel(R) Arc(TM) A770 Graphics
Stacktrace:
 [1] check_exceptions()
   @ OpenCL ~/Julia/pkg/OpenCL/src/compiler/exceptions.jl:48
 [2] finish(q::OpenCL.cl.CmdQueue)
   @ OpenCL.cl ~/Julia/pkg/OpenCL/lib/cl/cmdqueue.jl:65
 [3] top-level scope
   @ REPL[6]:1

julia> cl.platform!("pocl")
OpenCL.Platform('Portable Computing Language' @0x00007fcc25bbcc08)

julia> @opencl kernel();

julia> cl.finish(cl.queue());

[maleadt]

gpuarrays/random also triggers:

      From worker 13:   error: line 308: OpFunctionCall Argument <id> '136[%state_2]'s type does not match Function <id> '58[%_struct_58]'s parameter type.
      From worker 13:     %213 = OpFunctionCall %void %julia__throw_boundserror_38187 %state_2
      From worker 13:

The state_2 is suspicious there -- maybe the kernel state pass applying its changes twice?