llvm-project/mlir/test/IR/region.mlir

// RUN: mlir-opt -allow-unregistered-dialect %s -split-input-file -verify-diagnostics | FileCheck %s

//===----------------------------------------------------------------------===//
// Test the number of regions
//===----------------------------------------------------------------------===//

func @correct_number_of_regions() {
    // CHECK: test.two_region_op
    "test.two_region_op"()(
      {"work"() : () -> ()},
      {"work"() : () -> ()}
    ) : () -> ()
    return
}

// -----

func @missing_regions() {
    // expected-error@+1 {{expected 2 regions}}
    "test.two_region_op"()(
      {"work"() : () -> ()}
    ) : () -> ()
    return
}

// -----

func @extra_regions() {
    // expected-error@+1 {{expected 2 regions}}
    "test.two_region_op"()(
      {"work"() : () -> ()},
      {"work"() : () -> ()},
      {"work"() : () -> ()}
    ) : () -> ()
    return
}

// -----

//===----------------------------------------------------------------------===//
// Test SizedRegion
//===----------------------------------------------------------------------===//

func @unnamed_region_has_wrong_number_of_blocks() {
    // expected-error@+1 {{region #1 failed to verify constraint: region with 1 blocks}}
    "test.sized_region_op"() (
    {
        "work"() : () -> ()
        br ^next1
      ^next1:
        "work"() : () -> ()
    },
    {
        "work"() : () -> ()
        br ^next2
      ^next2:
        "work"() : () -> ()
    }) : () -> ()
    return
}

// -----

// Test region name in error message
func @named_region_has_wrong_number_of_blocks() {
    // expected-error@+1 {{region #0 ('my_region') failed to verify constraint: region with 2 blocks}}
    "test.sized_region_op"() (
    {
        "work"() : () -> ()
    },
    {
        "work"() : () -> ()
    }) : () -> ()
    return
}