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clGetKernelArgInfo - Returns information about the arguments of a kernel.

cl_int clGetKernelArgInfo(cl_kernel kernel, cl_uint arg_indx, cl_kernel_arg_info param_name, size_t param_value_size, void *param_value, size_t *param_value_size_ret);



Specifies the kernel object being queried.


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.


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.


A pointer to memory where the appropriate result being queried is returned. If param_value is NULL, it is ignored.


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 Return Type Info. returned in param_value
CL_KERNEL_ARG_ADDRESS_QUALIFIER cl_kernel_arg_- address_qualifier Returns the address 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_- access_qualifier Returns the access qualifier specified for 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- type_qualifier Returns the type qualifier specified for the 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.


Returns the actual size in bytes of data copied to param_value. If param_value_size_ret is NULL, it is ignored.


Kernel argument information is only available if the program object associated with kernel is created with clCreateProgramWithSource(3clc) and the program executable is built with the -cl-kernel-arg-info option specified in options argument to clBuildProgram(3clc) or clCompileProgram(3clc).


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.


OpenCL Specification[1]


clCreateKernel(3clc), clGetKernelInfo(3clc), clCreateKernelsInProgram(3clc), clRetainKernel(3clc), clReleaseKernel(3clc), clSetKernelArg(3clc), clGetKernelWorkGroupInfo(3clc)


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OpenCL Specification
page 166, section 5.7.3 - Kernel Object Queries (updated for 1.2 rev 14)
01/14/2021 The Khronos Group