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clGetKernelArgInfo - Returns information about the arguments of a kernel.
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Copyright
Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or
associated documentation files (the "Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included in all copies or
substantial portions of the Materials.
Errors
Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of the following
errors:
• CL_INVALID_ARG_INDEX if arg_indx is not a valid argument index.
• CL_INVALID_VALUE if param_name is not valid, or if size in bytes specified by param_value_size is <
size of return type as described in the table above and param_value is not NULL
• CL_KERNEL_ARG_INFO_NOT_AVAILABLE if the argument information is not available for kernel.
• CL_INVALID_KERNEL if kernel is not a valid kernel object.
Name
clGetKernelArgInfo - Returns information about the arguments of a kernel.
cl_intclGetKernelArgInfo(cl_kernelkernel,cl_uintarg_indx,cl_kernel_arg_infoparam_name,size_tparam_value_size,void*param_value,size_t*param_value_size_ret);Notes
1. OpenCL Specification
page 166, section 5.7.3 - Kernel Object Queries (updated for 1.2 rev 14)
The Khronos Group 11/18/2024 CLGETKERNELARGINFO(3clc)
Parameters
kernel
Specifies the kernel object being queried.
arg_indx
The argument index. Arguments to the kernel are referred by indices that go from 0 for the leftmost
argument to n - 1, where n is the total number of arguments declared by a kernel.
param_name
Specifies the argument information to query. The list of supported param_name types and the
information returned in param_value by clGetKernelArgInfo is described in the table below.
param_value
A pointer to memory where the appropriate result being queried is returned. If param_value is NULL,
it is ignored.
param_value_size
Used to specify the size in bytes of memory pointed to by param_value. This size must be > size of
return type as described in the table below.
┌─────────────────────────────────┬───────────────────┬────────────────────────────────────────────────┐
│ cl_kernel_arg_info │ ReturnType │ Info.returnedin │
│ │ │ param_value │
├─────────────────────────────────┼───────────────────┼────────────────────────────────────────────────┤
│ CL_KERNEL_ARG_ADDRESS_QUALIFIER │ cl_kernel_arg_- │ Returns the address │
│ │ address_qualifier │ qualifier specified for the │
│ │ │ argument given by arg_indx. │
│ │ │ This can be one of the │
│ │ │ following values: │
│ │ │ │
│ │ │ CL_KERNEL_ARG_ADDRESS_GLOBAL │
│ │ │ CL_KERNEL_ARG_ADDRESS_LOCAL │
│ │ │ CL_KERNEL_ARG_ADDRESS_CONSTANT │
│ │ │ CL_KERNEL_ARG_ADDRESS_PRIVATE │
│ │ │ │
│ │ │ │
│ │ │ If no address │
│ │ │ qualifier is │
│ │ │ specified, the │
│ │ │ default address │
│ │ │ qualifier which │
│ │ │ is │
│ │ │ CL_KERNEL_ARG_ADDRESS_PRIVATE │
│ │ │ is returned. │
├─────────────────────────────────┼───────────────────┼────────────────────────────────────────────────┤
│ CL_KERNEL_ARG_ACCESS_QUALIFIER │ cl_kernel_arg_- │ Returns the access qualifier specified for │
│ │ access_qualifier │ the argument given by arg_indx. This can be │
│ │ │ one of the following values: │
│ │ │ │
│ │ │ CL_KERNEL_ARG_ACCESS_READ_ONLY │
│ │ │ CL_KERNEL_ARG_ACCESS_WRITE_ONLY │
│ │ │ CL_KERNEL_ARG_ACCESS_READ_WRITE │
│ │ │ CL_KERNEL_ARG_ACCESS_NONE │
│ │ │ │
│ │ │ │
│ │ │ If argument is not an image type, │
│ │ │ CL_KERNEL_ARG_ACCESS_NONE is │
│ │ │ returned. If argument is an image │
│ │ │ type, the access qualifier │
│ │ │ specified or the default access │
│ │ │ qualifier is returned. │
├─────────────────────────────────┼───────────────────┼────────────────────────────────────────────────┤
│ CL_KERNEL_ARG_TYPE_NAME │ char[] │ Returns the type name specified for the │
│ │ │ argument given by arg_indx. The type name │
│ │ │ returned will be the argument type name as it │
│ │ │ was declared with any whitespace removed. If │
│ │ │ argument type name is an unsigned scalar type │
│ │ │ (i.e. unsigned char, unsigned short, unsigned │
│ │ │ int, unsigned long), uchar, ushort, uint and │
│ │ │ ulong will be returned. The argument type name │
│ │ │ returned does not include any type qualifiers. │
├─────────────────────────────────┼───────────────────┼────────────────────────────────────────────────┤
│ CL_KERNEL_ARG_TYPE_QUALIFIER │ cl_kernel_arg- │ Returns the type qualifier specified for the │
│ │ type_qualifier │ argument given by arg_indx. The returned value │
│ │ │ can be: CL_KERNEL_ARG_TYPE_CONST, │
│ │ │ CL_KERNEL_ARG_TYPE_RESTRICT, │
│ │ │ CL_KERNEL_ARG_TYPE_VOLATILE, a combination of │
│ │ │ the above enums or CL_KERNEL_ARG_TYPE_NONE. │
│ │ │ │
│ │ │ │
│ │ │ │
│ │ │ NOTE: CL_KERNEL_ARG_TYPE_VOLATILE is returned │
│ │ │ if the argument is a pointer and the pointer │
│ │ │ is declared with the volatile qualifier. │
├─────────────────────────────────┼───────────────────┼────────────────────────────────────────────────┤
│ CL_KERNEL_ARG_NAME │ char[] │ Returns the name specified for the argument │
│ │ │ given by arg_indx. │
└─────────────────────────────────┴───────────────────┴────────────────────────────────────────────────┘
param_value_size_ret
Returns the actual size in bytes of data copied to param_value. If param_value_size_ret is NULL, it
is ignored.
See Also
clCreateKernel(3clc), clGetKernelInfo(3clc), clCreateKernelsInProgram(3clc), clRetainKernel(3clc), clReleaseKernel(3clc), clSetKernelArg(3clc), clGetKernelWorkGroupInfo(3clc)
Specification
OpenCLSpecification[1]
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