Failure to compile generated code due to type mismatch

[Gustaf Thorslund]

When trying out the ocl* functions in ParModelica I ran into issues compiling the generated code. This might be related to bug #3214, but for ParModelica this time.

To start with the test code (that should probably be extended to cover more of the ocl* functions):

/// oclTest.mo
package oclTest
  
  constant Integer globalSizes = 10;
  constant Integer localSizes = 2;

  parkernel function Kernel
    parglobal output Integer groupId[globalSizes];
    parglobal output Integer localId[globalSizes];
  algorithm
    groupId[oclGetGlobalId(1)] := oclGetGroupId(1);
    localId[oclGetGlobalId(1)] := oclGetLocalId(1);
  end Kernel;
  
  function test
    output Integer groupId[globalSizes];
    output Integer localId[globalSizes];
  algorithm
    oclSetNumThreadsGlobalLocal1D({globalSizes}, {localSizes});
    (groupId, localId) := Kernel();
  end test;
end oclTest;

Then a little script:

/// oclTest.mos
loadFile("oclTest.mo");
getErrorString();

(x,y):=oclTest.test();
getErrorString();

Then try to build and run the test script:

$ omc -g=ParModelica oclTest.mos
true
""
Error processing file: oclTest.mos
Error: Error building simulator. Build log: g++ -I"/home/gustaf/local/openmodelica/include/omc/c"   -fPIC -O0 -falign-functions -march=native   -c -o oclTest_test.o oclTest_test.c
oclTest_test.c: In function ‘integer_array omc_oclTest_test(threadData_t*, integer_array*)’:
oclTest_test.c:35:46: error: cannot convert ‘base_array_t* {aka base_array_s*}’ to ‘device_integer_array* {aka dev_arr*}’ for argument ‘2’ to ‘device_integer_array omc_oclTest_Kernel(threadData_t*, device_integer_array*)’
   tmp2 = omc_oclTest_Kernel(threadData, &tmp1);
                                              ^
oclTest_test.makefile:18: recipe for target 'oclTest_test' failed
make: *** [oclTest_test] Error 1

# Error encountered! Exiting...
# Please check the error message and the flags.

Execution failed!

$ omc --version
1.9.3+dev (r25196)

[Mahder Alemseged Gebremedhin]

Ya I am already aware of this errors :). It's not the ocl* functions that are the problem though. It is the array copy functions. Specifically this line

(groupId, localId) := Kernel();

where the returned gpu arrays are copied to cpu arrays. Btw for now you should expicitly copy these values.

  protected
    parglobal Integer p_groupId[globalSizes];
    parglobal Integer p_localId[globalSizes];
  algorithm
    oclSetNumThreadsGlobalLocal1D({globalSizes}, {localSizes});
    (p_groupId, p_localId) := Kernel();
    groupId := p_groupId;
    localId := p_localId;

It is function signature mismatches between the normal run-time functions and the parmodelica run-time counterparts (passing values vs passing pointers). I am trying to decide which one to fix.

[Gustaf Thorslund]

Replying to mahge930:

Ya I am already aware of this errors :).

Good! Now it's also official :-)

It's not the ocl* functions that are the problem though.

Ok, so once we have a place for test cases, maybe this test should be split into two tests.

It is the array copy functions. Specifically this line

(groupId, localId) := Kernel();

where the returned gpu arrays are copied to cpu arrays.

Ok, so just one tiny line producing a few lines of compilation errors.

Btw for now you should expicitly copy these values.

Thanks for the workaround! I suppose you are already aware each of these likes will produce quite a few lines of compilation errors:

    (p_groupId, p_localId) := Kernel();
    groupId := p_groupId;
    localId := p_localId;

Some of the errors when using -v=1:

oclTest_test.c: In function ‘integer_array omc_oclTest_test(threadData_t*, integer_array*)’:
oclTest_test.c:41:46: error: cannot convert ‘base_array_t* {aka base_array_s*}’ to ‘device_integer_array* {aka dev_arr*}’ for argument ‘2’ to ‘device_integer_array omc_oclTest_Kernel(threadData_t*, device_integer_array*)’
   tmp2 = omc_oclTest_Kernel(threadData, &tmp1);
                                              ^
oclTest_test.c:42:14: error: no match for ‘operator=’ (operand types are ‘device_integer_array {aka dev_arr}’ and ‘base_array_t {aka base_array_s}’)
   _p_localId = tmp1;
              ^
oclTest_test.c:42:14: note: candidate is:
In file included from /home/gustaf/local/openmodelica/include/omc/c/ParModelica/explicit/openclrt/omc_ocl_interface.h:55:0,
                 from oclTest_test.h:8,
                 from oclTest_test.c:1:
/home/gustaf/local/openmodelica/include/omc/c/ParModelica/explicit/openclrt/omc_ocl_common_header.h:88:16: note: dev_arr& dev_arr::operator=(const dev_arr&)
 typedef struct dev_arr{
                ^
/home/gustaf/local/openmodelica/include/omc/c/ParModelica/explicit/openclrt/omc_ocl_common_header.h:88:16: note:   no known conversion for argument 1 from ‘base_array_t {aka base_array_s}’ to ‘const dev_arr&’
oclTest_test.c:43:14: error: no match for ‘operator=’ (operand types are ‘device_integer_array {aka dev_arr}’ and ‘base_array_t {aka base_array_s}’)
   _p_groupId = tmp2;
              ^
oclTest_test.c:43:14: note: candidate is:
In file included from /home/gustaf/local/openmodelica/include/omc/c/ParModelica/explicit/openclrt/omc_ocl_interface.h:55:0,
                 from oclTest_test.h:8,
                 from oclTest_test.c:1:
/home/gustaf/local/openmodelica/include/omc/c/ParModelica/explicit/openclrt/omc_ocl_common_header.h:88:16: note: dev_arr& dev_arr::operator=(const dev_arr&)
 typedef struct dev_arr{
                ^
/home/gustaf/local/openmodelica/include/omc/c/ParModelica/explicit/openclrt/omc_ocl_common_header.h:88:16: note:   no known conversion for argument 1 from ‘base_array_t {aka base_array_s}’ to ‘const dev_arr&’
oclTest_test.c:45:153: error: cannot convert ‘device_integer_array* {aka dev_arr*}’ to ‘const integer_array_t* {aka const base_array_s*}’ for argument ‘1’ to ‘modelica_integer* integer_array_element_addr(const integer_array_t*, int, ...)’
   array_alloc_scalar_integer_array(&tmp3, 10, (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 1)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 2)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 3)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 4)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 5)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 6)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 7)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 8)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 9)), (modelica_integer)(*integer_array_element_addr(&_p_groupId, 1, /* modelica_integer */ (modelica_integer) 10)));
.
.
.
oclTest_test.c:48:153: error: cannot convert ‘device_integer_array* {aka dev_arr*}’ to ‘const integer_array_t* {aka const base_array_s*}’ for argument ‘1’ to ‘mode
lica_integer* integer_array_element_addr(const integer_array_t*, int, ...)’
   array_alloc_scalar_integer_array(&tmp4, 10, (modelica_integer)(*integer_array_element_addr(&_p_localId, 1, /* modelica_integer */ (modelica_integer) 1)), (model
ica_integer)(*integer_array_element_addr(&_p_localId, 1, /* modelica_integer */ (modelica_integer) 2)), (modelica_integer)(*integer_array_element_addr(&_p_localId,
 1, /* modelica_integer */ (modelica_integer) 3)), (modelica_integer)(*integer_array_element_addr(&_p_localId, 1, /* modelica_integer */ (modelica_integer) 4)), (m
odelica_integer)(*integer_array_element_addr(&_p_localId, 1, /* modelica_integer */ (modelica_integer) 5)), (modelica_integer)(*integer_array_element_addr(&_p_loca
lId, 1, /* modelica_integer */ (modelica_integer) 6)), (modelica_integer)(*integer_array_element_addr(&_p_localId, 1, /* modelica_integer */ (modelica_integer) 7))
, (modelica_integer)(*integer_array_element_addr(&_p_localId, 1, /* modelica_integer */ (modelica_integer) 8)), (modelica_integer)(*integer_array_element_addr(&_p_
localId, 1, /* modelica_integer */ (modelica_integer) 9)), (modelica_integer)(*integer_array_element_addr(&_p_localId, 1, /* modelica_integer */ (modelica_integer)
 10)));
.
.
.

It is function signature mismatches between the normal run-time functions and the parmodelica run-time counterparts (passing values vs passing pointers). I am trying to decide which one to fix.

To fix normal run-time I suppose you should have some other ticket to work on, but maybe you already have.

[Mahder Alemseged Gebremedhin]

Fixed in 17d8596bf1869fef3c03787e99256b0c2a879ec7/OMCompiler.
Test added in a243f9eb9b3638c7b233edbe1ad27a479af3db58/OpenModelica-testsuite

[Mahder Alemseged Gebremedhin]

Recheck. There is no test for this.