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fail_reachable_fallthrough.carbon

fail_reachable_fallthrough.carbon 12 KB
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  1. // Part of the Carbon Language project, under the Apache License v2.0 with LLVM
    2. 

  2. // Exceptions. See /LICENSE for license information.
    3. 

  3. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
    4. 

  4. //
    5. 

  5. // AUTOUPDATE
    6. 

  6. // TIP: To test this file alone, run:
    7. 

  7. // TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/if/fail_reachable_fallthrough.carbon
    8. 

  8. // TIP: To dump output, run:
    9. 

  9. // TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if/fail_reachable_fallthrough.carbon
    10. 

  10. 

  11. fn If1(b: bool) -> i32 {
    12. 

  12.   if (b) {
    13. 

  13.     return 1;
    14. 

  14.   } else {
    15. 

  15.   }
    16. 

  16. // CHECK:STDERR: fail_reachable_fallthrough.carbon:[[@LINE+4]]:1: error: missing `return` at end of function with declared return type [MissingReturnStatement]
    17. 

  17. // CHECK:STDERR: }
    18. 

  18. // CHECK:STDERR: ^
    19. 

  19. // CHECK:STDERR:
    20. 

  20. }
    21. 

  21. 

  22. fn If2(b: bool) -> i32 {
    23. 

  23.   if (b) {
    24. 

  24.   } else {
    25. 

  25.     return 2;
    26. 

  26.   }
    27. 

  27. // CHECK:STDERR: fail_reachable_fallthrough.carbon:[[@LINE+4]]:1: error: missing `return` at end of function with declared return type [MissingReturnStatement]
    28. 

  28. // CHECK:STDERR: }
    29. 

  29. // CHECK:STDERR: ^
    30. 

  30. // CHECK:STDERR:
    31. 

  31. }
    32. 

  32. 

  33. fn If3(b: bool) -> i32 {
    34. 

  34.   if (b) {
    35. 

  35.     return 1;
    36. 

  36.   }
    37. 

  37. // CHECK:STDERR: fail_reachable_fallthrough.carbon:[[@LINE+4]]:1: error: missing `return` at end of function with declared return type [MissingReturnStatement]
    38. 

  38. // CHECK:STDERR: }
    39. 

  39. // CHECK:STDERR: ^
    40. 

  40. // CHECK:STDERR:
    41. 

  41. }
    42. 

  42. 

  43. // CHECK:STDOUT: --- fail_reachable_fallthrough.carbon
    44. 

  44. // CHECK:STDOUT:
    45. 

  45. // CHECK:STDOUT: constants {
    46. 

  46. // CHECK:STDOUT:   %Bool.type: type = fn_type @Bool [concrete]
    47. 

  47. // CHECK:STDOUT:   %Bool: %Bool.type = struct_value () [concrete]
    48. 

  48. // CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
    49. 

  49. // CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
    50. 

  50. // CHECK:STDOUT:   %If1.type: type = fn_type @If1 [concrete]
    51. 

  51. // CHECK:STDOUT:   %If1: %If1.type = struct_value () [concrete]
    52. 

  52. // CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
    53. 

  53. // CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
    54. 

  54. // CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
    55. 

  55. // CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (imports.%Core.import_ref.a5b), @impl.4f9 [concrete]
    56. 

  56. // CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness %ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
    57. 

  57. // CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
    58. 

  58. // CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
    59. 

  59. // CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
    60. 

  60. // CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
    61. 

  61. // CHECK:STDOUT:   %Convert.bound.ab5: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
    62. 

  62. // CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
    63. 

  63. // CHECK:STDOUT:   %bound_method.9a1: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
    64. 

  64. // CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
    65. 

  65. // CHECK:STDOUT:   %If2.type: type = fn_type @If2 [concrete]
    66. 

  66. // CHECK:STDOUT:   %If2: %If2.type = struct_value () [concrete]
    67. 

  67. // CHECK:STDOUT:   %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
    68. 

  68. // CHECK:STDOUT:   %Convert.bound.ef9: <bound method> = bound_method %int_2.ecc, %Convert.956 [concrete]
    69. 

  69. // CHECK:STDOUT:   %bound_method.b92: <bound method> = bound_method %int_2.ecc, %Convert.specific_fn [concrete]
    70. 

  70. // CHECK:STDOUT:   %int_2.ef8: %i32 = int_value 2 [concrete]
    71. 

  71. // CHECK:STDOUT:   %If3.type: type = fn_type @If3 [concrete]
    72. 

  72. // CHECK:STDOUT:   %If3: %If3.type = struct_value () [concrete]
    73. 

  73. // CHECK:STDOUT: }
    74. 

  74. // CHECK:STDOUT:
    75. 

  75. // CHECK:STDOUT: imports {
    76. 

  76. // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
    77. 

  77. // CHECK:STDOUT:     .Bool = %Core.Bool
    78. 

  78. // CHECK:STDOUT:     .Int = %Core.Int
    79. 

  79. // CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
    80. 

  80. // CHECK:STDOUT:     import Core//prelude
    81. 

  81. // CHECK:STDOUT:     import Core//prelude/...
    82. 

  82. // CHECK:STDOUT:   }
    83. 

  83. // CHECK:STDOUT: }
    84. 

  84. // CHECK:STDOUT:
    85. 

  85. // CHECK:STDOUT: file {
    86. 

  86. // CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
    87. 

  87. // CHECK:STDOUT:     .Core = imports.%Core
    88. 

  88. // CHECK:STDOUT:     .If1 = %If1.decl
    89. 

  89. // CHECK:STDOUT:     .If2 = %If2.decl
    90. 

  90. // CHECK:STDOUT:     .If3 = %If3.decl
    91. 

  91. // CHECK:STDOUT:   }
    92. 

  92. // CHECK:STDOUT:   %Core.import = import Core
    93. 

  93. // CHECK:STDOUT:   %If1.decl: %If1.type = fn_decl @If1 [concrete = constants.%If1] {
    94. 

  94. // CHECK:STDOUT:     %b.patt: bool = binding_pattern b
    95. 

  95. // CHECK:STDOUT:     %b.param_patt: bool = value_param_pattern %b.patt, call_param0
    96. 

  96. // CHECK:STDOUT:     %return.patt: %i32 = return_slot_pattern
    97. 

  97. // CHECK:STDOUT:     %return.param_patt: %i32 = out_param_pattern %return.patt, call_param1
    98. 

  98. // CHECK:STDOUT:   } {
    99. 

  99. // CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
    100. 

  100. // CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
    101. 

  101. // CHECK:STDOUT:     %b.param: bool = value_param call_param0
    102. 

  102. // CHECK:STDOUT:     %.loc11_11.1: type = splice_block %.loc11_11.3 [concrete = bool] {
    103. 

  103. // CHECK:STDOUT:       %bool.make_type: init type = call constants.%Bool() [concrete = bool]
    104. 

  104. // CHECK:STDOUT:       %.loc11_11.2: type = value_of_initializer %bool.make_type [concrete = bool]
    105. 

  105. // CHECK:STDOUT:       %.loc11_11.3: type = converted %bool.make_type, %.loc11_11.2 [concrete = bool]
    106. 

  106. // CHECK:STDOUT:     }
    107. 

  107. // CHECK:STDOUT:     %b: bool = bind_name b, %b.param
    108. 

  108. // CHECK:STDOUT:     %return.param: ref %i32 = out_param call_param1
    109. 

  109. // CHECK:STDOUT:     %return: ref %i32 = return_slot %return.param
    110. 

  110. // CHECK:STDOUT:   }
    111. 

  111. // CHECK:STDOUT:   %If2.decl: %If2.type = fn_decl @If2 [concrete = constants.%If2] {
    112. 

  112. // CHECK:STDOUT:     %b.patt: bool = binding_pattern b
    113. 

  113. // CHECK:STDOUT:     %b.param_patt: bool = value_param_pattern %b.patt, call_param0
    114. 

  114. // CHECK:STDOUT:     %return.patt: %i32 = return_slot_pattern
    115. 

  115. // CHECK:STDOUT:     %return.param_patt: %i32 = out_param_pattern %return.patt, call_param1
    116. 

  116. // CHECK:STDOUT:   } {
    117. 

  117. // CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
    118. 

  118. // CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
    119. 

  119. // CHECK:STDOUT:     %b.param: bool = value_param call_param0
    120. 

  120. // CHECK:STDOUT:     %.loc22_11.1: type = splice_block %.loc22_11.3 [concrete = bool] {
    121. 

  121. // CHECK:STDOUT:       %bool.make_type: init type = call constants.%Bool() [concrete = bool]
    122. 

  122. // CHECK:STDOUT:       %.loc22_11.2: type = value_of_initializer %bool.make_type [concrete = bool]
    123. 

  123. // CHECK:STDOUT:       %.loc22_11.3: type = converted %bool.make_type, %.loc22_11.2 [concrete = bool]
    124. 

  124. // CHECK:STDOUT:     }
    125. 

  125. // CHECK:STDOUT:     %b: bool = bind_name b, %b.param
    126. 

  126. // CHECK:STDOUT:     %return.param: ref %i32 = out_param call_param1
    127. 

  127. // CHECK:STDOUT:     %return: ref %i32 = return_slot %return.param
    128. 

  128. // CHECK:STDOUT:   }
    129. 

  129. // CHECK:STDOUT:   %If3.decl: %If3.type = fn_decl @If3 [concrete = constants.%If3] {
    130. 

  130. // CHECK:STDOUT:     %b.patt: bool = binding_pattern b
    131. 

  131. // CHECK:STDOUT:     %b.param_patt: bool = value_param_pattern %b.patt, call_param0
    132. 

  132. // CHECK:STDOUT:     %return.patt: %i32 = return_slot_pattern
    133. 

  133. // CHECK:STDOUT:     %return.param_patt: %i32 = out_param_pattern %return.patt, call_param1
    134. 

  134. // CHECK:STDOUT:   } {
    135. 

  135. // CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
    136. 

  136. // CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
    137. 

  137. // CHECK:STDOUT:     %b.param: bool = value_param call_param0
    138. 

  138. // CHECK:STDOUT:     %.loc33_11.1: type = splice_block %.loc33_11.3 [concrete = bool] {
    139. 

  139. // CHECK:STDOUT:       %bool.make_type: init type = call constants.%Bool() [concrete = bool]
    140. 

  140. // CHECK:STDOUT:       %.loc33_11.2: type = value_of_initializer %bool.make_type [concrete = bool]
    141. 

  141. // CHECK:STDOUT:       %.loc33_11.3: type = converted %bool.make_type, %.loc33_11.2 [concrete = bool]
    142. 

  142. // CHECK:STDOUT:     }
    143. 

  143. // CHECK:STDOUT:     %b: bool = bind_name b, %b.param
    144. 

  144. // CHECK:STDOUT:     %return.param: ref %i32 = out_param call_param1
    145. 

  145. // CHECK:STDOUT:     %return: ref %i32 = return_slot %return.param
    146. 

  146. // CHECK:STDOUT:   }
    147. 

  147. // CHECK:STDOUT: }
    148. 

  148. // CHECK:STDOUT:
    149. 

  149. // CHECK:STDOUT: fn @If1(%b.param_patt: bool) -> %i32 {
    150. 

  150. // CHECK:STDOUT: !entry:
    151. 

  151. // CHECK:STDOUT:   %b.ref: bool = name_ref b, %b
    152. 

  152. // CHECK:STDOUT:   if %b.ref br !if.then else br !if.else
    153. 

  153. // CHECK:STDOUT:
    154. 

  154. // CHECK:STDOUT: !if.then:
    155. 

  155. // CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
    156. 

  156. // CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
    157. 

  157. // CHECK:STDOUT:   %bound_method.loc13_13.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound.ab5]
    158. 

  158. // CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
    159. 

  159. // CHECK:STDOUT:   %bound_method.loc13_13.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method.9a1]
    160. 

  160. // CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc13_13.2(%int_1) [concrete = constants.%int_1.5d2]
    161. 

  161. // CHECK:STDOUT:   %.loc13_13.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
    162. 

  162. // CHECK:STDOUT:   %.loc13_13.2: %i32 = converted %int_1, %.loc13_13.1 [concrete = constants.%int_1.5d2]
    163. 

  163. // CHECK:STDOUT:   return %.loc13_13.2
    164. 

  164. // CHECK:STDOUT:
    165. 

  165. // CHECK:STDOUT: !if.else:
    166. 

  166. // CHECK:STDOUT:   br !if.done
    167. 

  167. // CHECK:STDOUT:
    168. 

  168. // CHECK:STDOUT: !if.done:
    169. 

  169. // CHECK:STDOUT: }
    170. 

  170. // CHECK:STDOUT:
    171. 

  171. // CHECK:STDOUT: fn @If2(%b.param_patt: bool) -> %i32 {
    172. 

  172. // CHECK:STDOUT: !entry:
    173. 

  173. // CHECK:STDOUT:   %b.ref: bool = name_ref b, %b
    174. 

  174. // CHECK:STDOUT:   if %b.ref br !if.then else br !if.else
    175. 

  175. // CHECK:STDOUT:
    176. 

  176. // CHECK:STDOUT: !if.then:
    177. 

  177. // CHECK:STDOUT:   br !if.done
    178. 

  178. // CHECK:STDOUT:
    179. 

  179. // CHECK:STDOUT: !if.else:
    180. 

  180. // CHECK:STDOUT:   %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
    181. 

  181. // CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
    182. 

  182. // CHECK:STDOUT:   %bound_method.loc25_13.1: <bound method> = bound_method %int_2, %impl.elem0 [concrete = constants.%Convert.bound.ef9]
    183. 

  183. // CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
    184. 

  184. // CHECK:STDOUT:   %bound_method.loc25_13.2: <bound method> = bound_method %int_2, %specific_fn [concrete = constants.%bound_method.b92]
    185. 

  185. // CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc25_13.2(%int_2) [concrete = constants.%int_2.ef8]
    186. 

  186. // CHECK:STDOUT:   %.loc25_13.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_2.ef8]
    187. 

  187. // CHECK:STDOUT:   %.loc25_13.2: %i32 = converted %int_2, %.loc25_13.1 [concrete = constants.%int_2.ef8]
    188. 

  188. // CHECK:STDOUT:   return %.loc25_13.2
    189. 

  189. // CHECK:STDOUT:
    190. 

  190. // CHECK:STDOUT: !if.done:
    191. 

  191. // CHECK:STDOUT: }
    192. 

  192. // CHECK:STDOUT:
    193. 

  193. // CHECK:STDOUT: fn @If3(%b.param_patt: bool) -> %i32 {
    194. 

  194. // CHECK:STDOUT: !entry:
    195. 

  195. // CHECK:STDOUT:   %b.ref: bool = name_ref b, %b
    196. 

  196. // CHECK:STDOUT:   if %b.ref br !if.then else br !if.else
    197. 

  197. // CHECK:STDOUT:
    198. 

  198. // CHECK:STDOUT: !if.then:
    199. 

  199. // CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
    200. 

  200. // CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
    201. 

  201. // CHECK:STDOUT:   %bound_method.loc35_13.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound.ab5]
    202. 

  202. // CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
    203. 

  203. // CHECK:STDOUT:   %bound_method.loc35_13.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method.9a1]
    204. 

  204. // CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc35_13.2(%int_1) [concrete = constants.%int_1.5d2]
    205. 

  205. // CHECK:STDOUT:   %.loc35_13.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
    206. 

  206. // CHECK:STDOUT:   %.loc35_13.2: %i32 = converted %int_1, %.loc35_13.1 [concrete = constants.%int_1.5d2]
    207. 

  207. // CHECK:STDOUT:   return %.loc35_13.2
    208. 

  208. // CHECK:STDOUT:
    209. 

  209. // CHECK:STDOUT: !if.else:
    210. 

  210. // CHECK:STDOUT: }
    211. 

  211. // CHECK:STDOUT:
    212.