spirv: handle SpvOpMemberName

Now we can see field names in structs instead of generic
"fieldN" with NIR_PRINT=1.

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13941>

.gitlab-ci/windows/spirv2dxil_reference.txt

@@ -1272,11 +1272,11 @@ Test:SpvParserTest_Impl_GenericVulkanShader_GLSL450MemoryModel.spvasm:main|GLCom
 Test:SpvParserTest_Impl_GenericVulkanShader_SimpleMemoryModel.spvasm:main|GLCompute: Pass
 Test:SpvParserTest_Impl_GenericVulkanShader_VulkanMemoryModel.spvasm:main|GLCompute: Fail
 SPIR-V WARNING:
-    In file ../src/compiler/spirv/spirv_to_nir.c:4663
+    In file ../src/compiler/spirv/spirv_to_nir.c:4687
     Unsupported SPIR-V capability: SpvCapabilityVulkanMemoryModel (5345)
     28 bytes into the SPIR-V binary
 SPIR-V parsing FAILED:
-    In file ../src/compiler/spirv/spirv_to_nir.c:4817
+    In file ../src/compiler/spirv/spirv_to_nir.c:4841
     Vulkan memory model is unsupported by this driver
     68 bytes into the SPIR-V binary
 Compilation failed

src/compiler/spirv/spirv_to_nir.c

@@ -597,7 +597,8 @@ _foreach_decoration_helper(struct vtn_builder *b,
                      member, base_value->type->length);
       } else {
          /* Not a decoration */
-         assert(dec->scope == VTN_DEC_EXECUTION_MODE);
+         assert(dec->scope == VTN_DEC_EXECUTION_MODE ||
+                dec->scope <= VTN_DEC_STRUCT_MEMBER_NAME0);
          continue;
       }
 
@@ -688,6 +689,19 @@ vtn_handle_decoration(struct vtn_builder *b, SpvOp opcode,
       break;
    }
 
+   case SpvOpMemberName: {
+      struct vtn_value *val = vtn_untyped_value(b, target);
+      struct vtn_decoration *dec = rzalloc(b, struct vtn_decoration);
+
+      dec->scope = VTN_DEC_STRUCT_MEMBER_NAME0 - *(w++);
+
+      dec->member_name = vtn_string_literal(b, w, w_end - w, NULL);
+
+      dec->next = val->decoration;
+      val->decoration = dec;
+      break;
+   }
+
    case SpvOpGroupMemberDecorate:
    case SpvOpGroupDecorate: {
       struct vtn_value *group =
@@ -1510,9 +1524,19 @@ vtn_handle_type(struct vtn_builder *b, SpvOp opcode,
       NIR_VLA(struct glsl_struct_field, fields, count);
       for (unsigned i = 0; i < num_fields; i++) {
          val->type->members[i] = vtn_get_type(b, w[i + 2]);
+         const char *name = NULL;
+         for (struct vtn_decoration *dec = val->decoration; dec; dec = dec->next) {
+            if (dec->scope == VTN_DEC_STRUCT_MEMBER_NAME0 - i) {
+               name = dec->member_name;
+               break;
+            }
+         }
+         if (!name)
+            name = ralloc_asprintf(b, "field%d", i);
+
          fields[i] = (struct glsl_struct_field) {
             .type = val->type->members[i]->type,
-            .name = ralloc_asprintf(b, "field%d", i),
+            .name = name,
             .location = -1,
             .offset = -1,
          };
@@ -4837,9 +4861,6 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
       break;
 
    case SpvOpMemberName:
-      /* TODO */
-      break;
-
    case SpvOpExecutionMode:
    case SpvOpExecutionModeId:
    case SpvOpDecorationGroup:

src/compiler/spirv/vtn_private.h

@@ -624,14 +624,23 @@ struct vtn_value {
 
 #define VTN_DEC_DECORATION -1
 #define VTN_DEC_EXECUTION_MODE -2
+#define VTN_DEC_STRUCT_MEMBER_NAME0 -3
 #define VTN_DEC_STRUCT_MEMBER0 0
 
 struct vtn_decoration {
    struct vtn_decoration *next;
 
-   /* Specifies how to apply this decoration.  Negative values represent a
+   /* Different kinds of decorations are stored in a value,
-    * decoration or execution mode. (See the VTN_DEC_ #defines above.)
+      the scope defines what decoration it refers to:
-    * Non-negative values specify that it applies to a structure member.
+
+      - VTN_DEC_DECORATION:
+            decoration associated with the value
+      - VTN_DEC_EXECUTION_MODE:
+            an execution mode associated with an entrypoint value
+      - VTN_DEC_STRUCT_MEMBER0 + m:
+            decoration associated with member m of a struct value
+      - VTN_DEC_STRUCT_MEMBER_NAME0 - m:
+            name of m'th member of a struct value
     */
    int scope;
 
@@ -641,6 +650,7 @@ struct vtn_decoration {
    union {
       SpvDecoration decoration;
       SpvExecutionMode exec_mode;
+      const char *member_name;
    };
 };