[OpenCL] Add image query builtin functions

[svenvh]

Summary

Add the image query builtin functions from the OpenCL C specification.

Patch by Pierre Gondois and Sven van Haastregt.

[Anastasia]

LGTM! Thanks!

cfe/trunk/lib/Sema/OpenCLBuiltins.td

foreach imgTy = [Image3d] in {
     def : Builtin<"write_imagef", [Void, ImageType<imgTy, aQual>, VectorType<Int, 4>, VectorType<Float, 4>]>;
     def : Builtin<"write_imagei", [Void, ImageType<imgTy, aQual>, VectorType<Int, 4>, VectorType<Int, 4>]>;
     def : Builtin<"write_imageui", [Void, ImageType<imgTy, aQual>, VectorType<Int, 4>, VectorType<UInt, 4>]>;
   }
   def : Builtin<"write_imagef", [Void, ImageType<Image2dDepth, aQual>, VectorType<Int, 2>, Float]>;
   def : Builtin<"write_imagef", [Void, ImageType<Image2dArrayDepth, aQual>, VectorType<Int, 4>, Float]>;
 }
 
+// --- Table 25: Image Query Functions ---
+foreach aQual = ["RO", "WO", "RW"] in {
+  foreach imgTy = [Image1d, Image1dBuffer, Image2d, Image3d,
+                   Image1dArray, Image2dArray, Image2dDepth,
+                   Image2dArrayDepth] in {
+    foreach name = ["get_image_width", "get_image_channel_data_type",
+                    "get_image_channel_order"] in {
+      def : Builtin<name, [Int, ImageType<imgTy, aQual>]>;
+    }
+  }
+  foreach imgTy = [Image2d, Image3d, Image2dArray, Image2dDepth,
+                   Image2dArrayDepth] in {
+    def : Builtin<"get_image_height", [Int, ImageType<imgTy, aQual>]>;
+  }
+  def : Builtin<"get_image_depth", [Int, ImageType<Image3d, aQual>]>;
+  foreach imgTy = [Image2d, Image2dArray, Image2dDepth,
+                   Image2dArrayDepth] in {
+    def : Builtin<"get_image_dim", [VectorType<Int, 2>, ImageType<imgTy, aQual>]>;
+  }
+  def : Builtin<"get_image_dim", [VectorType<Int, 4>, ImageType<Image3d, aQual>]>;
+  foreach imgTy = [Image1dArray, Image2dArray, Image2dArrayDepth] in {
+    def : Builtin<"get_image_array_size", [Size, ImageType<imgTy, aQual>]>;
+  }
+}
+
 // OpenCL extension v2.0 s5.1.9: Built-in Image Read Functions
 // --- Table 8 ---
 foreach aQual = ["RO"] in {
   foreach name = ["read_imageh"] in {
     foreach coordTy = [Int, Float] in {
       foreach imgTy = [Image2d, Image1dArray] in {
         def : Builtin<name, [VectorType<Half, 4>, ImageType<imgTy, aQual>, Sampler, VectorType<coordTy, 2>]>;
       }

cfe/trunk/test/SemaOpenCL/fdeclare-opencl-builtins.cl

kernel void basic_image_readonly(read_only image2d_t image_read_only_image2d) {
   int2 i2;
   sampler_t sampler;
   half4 res;
   float4 resf;
 
   resf = read_imagef(image_read_only_image2d, i2);
   res = read_imageh(image_read_only_image2d, i2);
   res = read_imageh(image_read_only_image2d, sampler, i2);
+
+  int imgWidth = get_image_width(image_read_only_image2d);
 }
 
 #if __OPENCL_C_VERSION__ >= CL_VERSION_2_0
 kernel void basic_image_readwrite(read_write image3d_t image_read_write_image3d) {
   half4 h4;
   int4 i4;
 
   write_imageh(image_read_write_image3d, i4, h4);
+
+  int imgDepth = get_image_depth(image_read_write_image3d);
 }
 #endif // __OPENCL_C_VERSION__ >= CL_VERSION_2_0
 
 kernel void basic_image_writeonly(write_only image1d_buffer_t image_write_only_image1d_buffer) {
   half4 h4;
   float4 f4;
   int i;