}
 
    default:
-      vtn_fail("Unhandled opcode");
+      vtn_fail_with_opcode("Unhandled opcode", opcode);
    }
 }
 
       break;
 
    default:
-      vtn_fail("Unhandled decoration");
+      vtn_fail_with_decoration("Unhandled decoration", dec->decoration);
    }
 }
 
       break;
 
    default:
-      vtn_fail("Unhandled decoration");
+      vtn_fail_with_decoration("Unhandled decoration", dec->decoration);
    }
 }
 
    case SpvImageFormatR16ui:        return 0x8234; /* GL_R16UI */
    case SpvImageFormatR8ui:         return 0x8232; /* GL_R8UI */
    default:
-      vtn_fail("Invalid image format");
+      vtn_fail("Invalid image format: %s (%u)",
+               spirv_imageformat_to_string(format), format);
    }
 }
 
          val->type->type = (signedness ? glsl_int8_t_type() : glsl_uint8_t_type());
          break;
       default:
-         vtn_fail("Invalid int bit size");
+         vtn_fail("Invalid int bit size: %u", bit_size);
       }
       val->type->length = 1;
       break;
          val->type->type = glsl_double_type();
          break;
       default:
-         vtn_fail("Invalid float bit size");
+         vtn_fail("Invalid float bit size: %u", bit_size);
       }
       val->type->length = 1;
       break;
       case SpvDimBuffer:   dim = GLSL_SAMPLER_DIM_BUF;   break;
       case SpvDimSubpassData: dim = GLSL_SAMPLER_DIM_SUBPASS; break;
       default:
-         vtn_fail("Invalid SPIR-V image dimensionality");
+         vtn_fail("Invalid SPIR-V image dimensionality: %s (%u)",
+                  spirv_dim_to_string((SpvDim)w[3]), w[3]);
       }
 
       /* w[4]: as per Vulkan spec "Validation Rules within a Module",
    case SpvOpTypeQueue:
    case SpvOpTypePipe:
    default:
-      vtn_fail("Unhandled opcode");
+      vtn_fail_with_opcode("Unhandled opcode", opcode);
    }
 
    vtn_foreach_decoration(b, val, type_decoration_cb, NULL);
          val->constant->values[0][0].u8 = w[3];
          break;
       default:
-         vtn_fail("Unsupported SpvOpConstant bit size");
+         vtn_fail("Unsupported SpvOpConstant bit size: %u", bit_size);
       }
       break;
    }
       break;
 
    default:
-      vtn_fail("Unhandled opcode");
+      vtn_fail_with_opcode("Unhandled opcode", opcode);
    }
 
    /* Now that we have the value, update the workgroup size if needed */
       break;
 
    default:
-      vtn_fail("Unhandled opcode");
+      vtn_fail_with_opcode("Unhandled opcode", opcode);
    }
 
    nir_tex_src srcs[10]; /* 10 should be enough */
             case 32: instr->tg4_offsets[i][j] = cvec[j].i32;   break;
             case 64: instr->tg4_offsets[i][j] = cvec[j].i64;   break;
             default:
-               vtn_fail("Unsupported bit size");
+               vtn_fail("Unsupported bit size: %u", bit_size);
             }
          }
       }
       break;
 
    default:
-      vtn_fail("Invalid SPIR-V atomic");
+      vtn_fail_with_opcode("Invalid SPIR-V atomic", opcode);
    }
 }
 
       break;
 
    default:
-      vtn_fail("Invalid image opcode");
+      vtn_fail_with_opcode("Invalid image opcode", opcode);
    }
 
    nir_intrinsic_op op;
    OP(AtomicXor,              atomic_xor)
 #undef OP
    default:
-      vtn_fail("Invalid image opcode");
+      vtn_fail_with_opcode("Invalid image opcode", opcode);
    }
 
    nir_intrinsic_instr *intrin = nir_intrinsic_instr_create(b->shader, op);
       break;
 
    default:
-      vtn_fail("Invalid image opcode");
+      vtn_fail_with_opcode("Invalid image opcode", opcode);
    }
 
    if (opcode != SpvOpImageWrite && opcode != SpvOpAtomicStore) {
    OP(AtomicXor,              atomic_xor)
 #undef OP
    default:
-      vtn_fail("Invalid SSBO atomic");
+      vtn_fail_with_opcode("Invalid SSBO atomic", opcode);
    }
 }
 
    OP(AtomicXor,              atomic_xor)
 #undef OP
    default:
-      vtn_fail("Invalid shared atomic");
+      vtn_fail_with_opcode("Invalid shared atomic", opcode);
    }
 }
 
    OP(AtomicXor,              atomic_xor)
 #undef OP
    default:
-      vtn_fail("Invalid shared atomic");
+      vtn_fail_with_opcode("Invalid shared atomic", opcode);
    }
 }
 
       break;
 
    default:
-      vtn_fail("Invalid SPIR-V atomic");
+      vtn_fail_with_opcode("Invalid SPIR-V atomic", opcode);
    }
 
    /*
          break;
 
       default:
-         vtn_fail("Invalid SPIR-V atomic");
+         vtn_fail_with_opcode("Invalid SPIR-V atomic", opcode);
       }
    } else {
       nir_deref_instr *deref = vtn_pointer_to_deref(b, ptr);
          break;
 
       default:
-         vtn_fail("Invalid SPIR-V atomic");
+         vtn_fail_with_opcode("Invalid SPIR-V atomic", opcode);
       }
    }
 
    case 2: op = nir_op_vec2; break;
    case 3: op = nir_op_vec3; break;
    case 4: op = nir_op_vec4; break;
-   default: vtn_fail("bad vector size");
+   default: vtn_fail("bad vector size: %u", num_components);
    }
 
    nir_alu_instr *vec = nir_alu_instr_create(b->shader, op);
       break;
 
    default:
-      vtn_fail("unknown composite operation");
+      vtn_fail_with_opcode("unknown composite operation", opcode);
    }
 }
 
    case SpvExecutionModeOutputTriangleStrip:
       return 5; /* GL_TRIANGLE_STRIP */
    default:
-      vtn_fail("Invalid primitive type");
+      vtn_fail("Invalid primitive type: %s (%u)",
+               spirv_executionmode_to_string(mode), mode);
    }
 }
 
    case SpvExecutionModeInputTrianglesAdjacency:
       return 6;
    default:
-      vtn_fail("Invalid GS input mode");
+      vtn_fail("Invalid GS input mode: %s (%u)",
+               spirv_executionmode_to_string(mode), mode);
    }
 }
 
    case SpvExecutionModelKernel:
       return MESA_SHADER_KERNEL;
    default:
-      vtn_fail("Unsupported execution model");
+      vtn_fail("Unsupported execution model: %s (%u)",
+               spirv_executionmodel_to_string(model), model);
    }
 }
 
-#define spv_check_supported(name, cap) do {            \
-      if (!(b->options && b->options->caps.name))      \
-         vtn_warn("Unsupported SPIR-V capability: %s",  \
-                  spirv_capability_to_string(cap));     \
+#define spv_check_supported(name, cap) do {                 \
+      if (!(b->options && b->options->caps.name))           \
+         vtn_warn("Unsupported SPIR-V capability: %s (%u)", \
+                  spirv_capability_to_string(cap), cap);    \
    } while(0)
 
 
          break;
 
       default:
-         vtn_fail("Unhandled capability");
+         vtn_fail("Unhandled capability: %s (%u)",
+                  spirv_capability_to_string(cap), cap);
       }
       break;
    }
                      "AddressingModelPhysicalStorageBuffer64EXT not supported");
          break;
       default:
-         vtn_fail("Unknown addressing model");
+         vtn_fail("Unknown addressing model: %s (%u)",
+                  spirv_addressingmodel_to_string(w[1]), w[1]);
          break;
       }
 
       break;
 
    default:
-      vtn_fail("Unhandled execution mode");
+      vtn_fail("Unhandled execution mode: %s (%u)",
+               spirv_executionmode_to_string(mode->exec_mode),
+               mode->exec_mode);
    }
 }
 
       break;
 
    default:
-      vtn_fail("Unhandled opcode");
+      vtn_fail_with_opcode("Unhandled opcode", opcode);
    }
 
    return true;
 
       set_mode_system_value(b, mode);
       break;
    default:
-      vtn_fail("unsupported builtin: %u", builtin);
+      vtn_fail("Unsupported builtin: %s (%u)",
+               spirv_builtin_to_string(builtin), builtin);
    }
 }
 
       break;
 
    default:
-      vtn_fail("Unhandled decoration");
+      vtn_fail_with_decoration("Unhandled decoration", dec->decoration);
    }
 }
 
       break;
    case SpvStorageClassGeneric:
    default:
-      vtn_fail("Unhandled variable storage class");
+      vtn_fail("Unhandled variable storage class: %s (%u)",
+               spirv_storageclass_to_string(class), class);
    }
 
    if (nir_mode_out)
          struct vtn_value *link_val = vtn_untyped_value(b, w[i]);
          if (link_val->value_type == vtn_value_type_constant) {
             chain->link[idx].mode = vtn_access_mode_literal;
-            switch (glsl_get_bit_size(link_val->type->type)) {
+            const unsigned bit_size = glsl_get_bit_size(link_val->type->type);
+            switch (bit_size) {
             case 8:
                chain->link[idx].id = link_val->constant->values[0][0].i8;
                break;
                chain->link[idx].id = link_val->constant->values[0][0].i64;
                break;
             default:
-               vtn_fail("Invalid bit size");
+               vtn_fail("Invalid bit size: %u", bit_size);
             }
          } else {
             chain->link[idx].mode = vtn_access_mode_id;
 
    case SpvOpCopyMemorySized:
    default:
-      vtn_fail("Unhandled opcode");
+      vtn_fail_with_opcode("Unhandled opcode", opcode);
    }
 }