fix infinite recusion in ParseDescriptorBlockVariableUsage()

and enable the test cbuffer_unused_001.hlsl, it no longer crashes.

Author: xxxbxxx

spirv_reflect.c

@@ -2217,31 +2217,30 @@ static SpvReflectResult ParseDescriptorBlockVariableUsage(
     case SpvOpTypeArray: {
       // Parse through array's type hierarchy to find the actual/non-array element type
       SpvReflectTypeDescription* p_type = p_var->type_description;
-      while ((p_type->op == SpvOpTypeArray) && (index_index < p_access_chain->index_count)) {
-        // Find the array element type id
-        Node* p_node = FindNode(p_parser, p_type->id);
-        if (p_node == NULL) {
-          return SPV_REFLECT_RESULT_ERROR_SPIRV_INVALID_ID_REFERENCE;
-        }
-        uint32_t element_type_id = p_node->array_traits.element_type_id;
-        // Get the array element type
-        p_type = FindType(p_module, element_type_id);
-        if (p_type == NULL) {
-          return SPV_REFLECT_RESULT_ERROR_SPIRV_INVALID_ID_REFERENCE;
-        }
-        // Next access index
-        index_index += 1;
+      // Find the array element type id
+      Node* p_node = FindNode(p_parser, p_type->id);
+      if (p_node == NULL) {
+        return SPV_REFLECT_RESULT_ERROR_SPIRV_INVALID_ID_REFERENCE;
       }
-      // Parse current var again with a type override and advanced index index
-      SpvReflectResult result = ParseDescriptorBlockVariableUsage(
-        p_parser,
-        p_module,
-        p_access_chain,
-        index_index,
-        p_type->op,
-        p_var);
-      if (result != SPV_REFLECT_RESULT_SUCCESS) {
-        return result;
+      uint32_t element_type_id = p_node->array_traits.element_type_id;
+      // Get the array element type
+      p_type = FindType(p_module, element_type_id);
+      if (p_type == NULL) {
+        return SPV_REFLECT_RESULT_ERROR_SPIRV_INVALID_ID_REFERENCE;
+      }
+
+      if (index_index < p_access_chain->index_count) {
+          // Parse current var again with a type override and advanced index index
+          SpvReflectResult result = ParseDescriptorBlockVariableUsage(
+            p_parser,
+            p_module,
+            p_access_chain,
+            index_index+1,
+            p_type->op,
+            p_var);
+          if (result != SPV_REFLECT_RESULT_SUCCESS) {
+            return result;
+          }
       }
     }
     break;

tests/build_all_shaders.py

@@ -36,6 +36,7 @@ def my_which(cmd):
   {'source':"hlsl/counter_buffers.hlsl", 'entry':"main", 'profile':'ps_6_0', 'stage':'frag'},
   {'source':"hlsl/semantics.hlsl", 'entry':"main", 'profile':'ps_6_0', 'stage':'frag'},
   {'source':"hlsl/structuredbuffer.hlsl", 'entry':"main", 'profile':'ps_6_0', 'stage':'frag'},
+  {'source':"cbuffer_unused/cbuffer_unused_001.hlsl", 'entry':"main", 'profile':'vs_6_0', 'stage':'vert'},
 ]
 
 if __name__ == "__main__":