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identity.carbon

identity.carbon 7.4 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/as/identity.carbon
    8. 

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

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

  10. 

  11. // `expr as T` should behave the same as `expr` if `T` is the type of `expr`.
    12. 

  12. 

  13. class X {
    14. 

  14.   // ...
    15. 

  15. }
    16. 

  16. 

  17. fn Value(n: X) {
    18. 

  18.   let m: X = n as X;
    19. 

  19. }
    20. 

  20. 

  21. fn Reference(p: X*) {
    22. 

  22.   let q: X* = &(*p as X);
    23. 

  23. }
    24. 

  24. 

  25. fn Make() -> X;
    26. 

  26. 

  27. fn Initializing() {
    28. 

  28.   var x: X = (Make() as X);
    29. 

  29. }
    30. 

  30. 

  31. // CHECK:STDOUT: --- identity.carbon
    32. 

  32. // CHECK:STDOUT:
    33. 

  33. // CHECK:STDOUT: constants {
    34. 

  34. // CHECK:STDOUT:   %X: type = class_type @X [concrete]
    35. 

  35. // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
    36. 

  36. // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
    37. 

  37. // CHECK:STDOUT:   %pattern_type.019: type = pattern_type %X [concrete]
    38. 

  38. // CHECK:STDOUT:   %Value.type: type = fn_type @Value [concrete]
    39. 

  39. // CHECK:STDOUT:   %Value: %Value.type = struct_value () [concrete]
    40. 

  40. // CHECK:STDOUT:   %ptr.d17: type = ptr_type %X [concrete]
    41. 

  41. // CHECK:STDOUT:   %pattern_type.1c6: type = pattern_type %ptr.d17 [concrete]
    42. 

  42. // CHECK:STDOUT:   %Reference.type: type = fn_type @Reference [concrete]
    43. 

  43. // CHECK:STDOUT:   %Reference: %Reference.type = struct_value () [concrete]
    44. 

  44. // CHECK:STDOUT:   %Make.type: type = fn_type @Make [concrete]
    45. 

  45. // CHECK:STDOUT:   %Make: %Make.type = struct_value () [concrete]
    46. 

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

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

  48. // CHECK:STDOUT: }
    49. 

  49. // CHECK:STDOUT:
    50. 

  50. // CHECK:STDOUT: imports {
    51. 

  51. // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
    52. 

  52. // CHECK:STDOUT:     import Core//prelude
    53. 

  53. // CHECK:STDOUT:     import Core//prelude/...
    54. 

  54. // CHECK:STDOUT:   }
    55. 

  55. // CHECK:STDOUT: }
    56. 

  56. // CHECK:STDOUT:
    57. 

  57. // CHECK:STDOUT: file {
    58. 

  58. // CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
    59. 

  59. // CHECK:STDOUT:     .Core = imports.%Core
    60. 

  60. // CHECK:STDOUT:     .X = %X.decl
    61. 

  61. // CHECK:STDOUT:     .Value = %Value.decl
    62. 

  62. // CHECK:STDOUT:     .Reference = %Reference.decl
    63. 

  63. // CHECK:STDOUT:     .Make = %Make.decl
    64. 

  64. // CHECK:STDOUT:     .Initializing = %Initializing.decl
    65. 

  65. // CHECK:STDOUT:   }
    66. 

  66. // CHECK:STDOUT:   %Core.import = import Core
    67. 

  67. // CHECK:STDOUT:   %X.decl: type = class_decl @X [concrete = constants.%X] {} {}
    68. 

  68. // CHECK:STDOUT:   %Value.decl: %Value.type = fn_decl @Value [concrete = constants.%Value] {
    69. 

  69. // CHECK:STDOUT:     %n.patt: %pattern_type.019 = binding_pattern n [concrete]
    70. 

  70. // CHECK:STDOUT:     %n.param_patt: %pattern_type.019 = value_param_pattern %n.patt, call_param0 [concrete]
    71. 

  71. // CHECK:STDOUT:   } {
    72. 

  72. // CHECK:STDOUT:     %n.param: %X = value_param call_param0
    73. 

  73. // CHECK:STDOUT:     %X.ref.loc17: type = name_ref X, file.%X.decl [concrete = constants.%X]
    74. 

  74. // CHECK:STDOUT:     %n: %X = bind_name n, %n.param
    75. 

  75. // CHECK:STDOUT:   }
    76. 

  76. // CHECK:STDOUT:   %Reference.decl: %Reference.type = fn_decl @Reference [concrete = constants.%Reference] {
    77. 

  77. // CHECK:STDOUT:     %p.patt: %pattern_type.1c6 = binding_pattern p [concrete]
    78. 

  78. // CHECK:STDOUT:     %p.param_patt: %pattern_type.1c6 = value_param_pattern %p.patt, call_param0 [concrete]
    79. 

  79. // CHECK:STDOUT:   } {
    80. 

  80. // CHECK:STDOUT:     %p.param: %ptr.d17 = value_param call_param0
    81. 

  81. // CHECK:STDOUT:     %.loc21: type = splice_block %ptr.loc21 [concrete = constants.%ptr.d17] {
    82. 

  82. // CHECK:STDOUT:       %X.ref.loc21: type = name_ref X, file.%X.decl [concrete = constants.%X]
    83. 

  83. // CHECK:STDOUT:       %ptr.loc21: type = ptr_type %X.ref.loc21 [concrete = constants.%ptr.d17]
    84. 

  84. // CHECK:STDOUT:     }
    85. 

  85. // CHECK:STDOUT:     %p: %ptr.d17 = bind_name p, %p.param
    86. 

  86. // CHECK:STDOUT:   }
    87. 

  87. // CHECK:STDOUT:   %Make.decl: %Make.type = fn_decl @Make [concrete = constants.%Make] {
    88. 

  88. // CHECK:STDOUT:     %return.patt: %pattern_type.019 = return_slot_pattern [concrete]
    89. 

  89. // CHECK:STDOUT:     %return.param_patt: %pattern_type.019 = out_param_pattern %return.patt, call_param0 [concrete]
    90. 

  90. // CHECK:STDOUT:   } {
    91. 

  91. // CHECK:STDOUT:     %X.ref: type = name_ref X, file.%X.decl [concrete = constants.%X]
    92. 

  92. // CHECK:STDOUT:     %return.param: ref %X = out_param call_param0
    93. 

  93. // CHECK:STDOUT:     %return: ref %X = return_slot %return.param
    94. 

  94. // CHECK:STDOUT:   }
    95. 

  95. // CHECK:STDOUT:   %Initializing.decl: %Initializing.type = fn_decl @Initializing [concrete = constants.%Initializing] {} {}
    96. 

  96. // CHECK:STDOUT: }
    97. 

  97. // CHECK:STDOUT:
    98. 

  98. // CHECK:STDOUT: class @X {
    99. 

  99. // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
    100. 

  100. // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
    101. 

  101. // CHECK:STDOUT:   complete_type_witness = %complete_type
    102. 

  102. // CHECK:STDOUT:
    103. 

  103. // CHECK:STDOUT: !members:
    104. 

  104. // CHECK:STDOUT:   .Self = constants.%X
    105. 

  105. // CHECK:STDOUT: }
    106. 

  106. // CHECK:STDOUT:
    107. 

  107. // CHECK:STDOUT: fn @Value(%n.param: %X) {
    108. 

  108. // CHECK:STDOUT: !entry:
    109. 

  109. // CHECK:STDOUT:   name_binding_decl {
    110. 

  110. // CHECK:STDOUT:     %m.patt: %pattern_type.019 = binding_pattern m [concrete]
    111. 

  111. // CHECK:STDOUT:   }
    112. 

  112. // CHECK:STDOUT:   %n.ref: %X = name_ref n, %n
    113. 

  113. // CHECK:STDOUT:   %X.ref.loc18_19: type = name_ref X, file.%X.decl [concrete = constants.%X]
    114. 

  114. // CHECK:STDOUT:   %X.ref.loc18_10: type = name_ref X, file.%X.decl [concrete = constants.%X]
    115. 

  115. // CHECK:STDOUT:   %m: %X = bind_name m, %n.ref
    116. 

  116. // CHECK:STDOUT:   return
    117. 

  117. // CHECK:STDOUT: }
    118. 

  118. // CHECK:STDOUT:
    119. 

  119. // CHECK:STDOUT: fn @Reference(%p.param: %ptr.d17) {
    120. 

  120. // CHECK:STDOUT: !entry:
    121. 

  121. // CHECK:STDOUT:   name_binding_decl {
    122. 

  122. // CHECK:STDOUT:     %q.patt: %pattern_type.1c6 = binding_pattern q [concrete]
    123. 

  123. // CHECK:STDOUT:   }
    124. 

  124. // CHECK:STDOUT:   %p.ref: %ptr.d17 = name_ref p, %p
    125. 

  125. // CHECK:STDOUT:   %.loc22_17: ref %X = deref %p.ref
    126. 

  126. // CHECK:STDOUT:   %X.ref.loc22_23: type = name_ref X, file.%X.decl [concrete = constants.%X]
    127. 

  127. // CHECK:STDOUT:   %addr: %ptr.d17 = addr_of %.loc22_17
    128. 

  128. // CHECK:STDOUT:   %.loc22_11: type = splice_block %ptr.loc22 [concrete = constants.%ptr.d17] {
    129. 

  129. // CHECK:STDOUT:     %X.ref.loc22_10: type = name_ref X, file.%X.decl [concrete = constants.%X]
    130. 

  130. // CHECK:STDOUT:     %ptr.loc22: type = ptr_type %X.ref.loc22_10 [concrete = constants.%ptr.d17]
    131. 

  131. // CHECK:STDOUT:   }
    132. 

  132. // CHECK:STDOUT:   %q: %ptr.d17 = bind_name q, %addr
    133. 

  133. // CHECK:STDOUT:   return
    134. 

  134. // CHECK:STDOUT: }
    135. 

  135. // CHECK:STDOUT:
    136. 

  136. // CHECK:STDOUT: fn @Make() -> %return.param: %X;
    137. 

  137. // CHECK:STDOUT:
    138. 

  138. // CHECK:STDOUT: fn @Initializing() {
    139. 

  139. // CHECK:STDOUT: !entry:
    140. 

  140. // CHECK:STDOUT:   name_binding_decl {
    141. 

  141. // CHECK:STDOUT:     %x.patt: %pattern_type.019 = binding_pattern x [concrete]
    142. 

  142. // CHECK:STDOUT:     %.loc28_3.1: %pattern_type.019 = var_pattern %x.patt [concrete]
    143. 

  143. // CHECK:STDOUT:   }
    144. 

  144. // CHECK:STDOUT:   %x.var: ref %X = var x
    145. 

  145. // CHECK:STDOUT:   %Make.ref: %Make.type = name_ref Make, file.%Make.decl [concrete = constants.%Make]
    146. 

  146. // CHECK:STDOUT:   %.loc28_3.2: ref %X = splice_block %x.var {}
    147. 

  147. // CHECK:STDOUT:   %Make.call: init %X = call %Make.ref() to %.loc28_3.2
    148. 

  148. // CHECK:STDOUT:   %X.ref.loc28_25: type = name_ref X, file.%X.decl [concrete = constants.%X]
    149. 

  149. // CHECK:STDOUT:   assign %x.var, %Make.call
    150. 

  150. // CHECK:STDOUT:   %X.ref.loc28_10: type = name_ref X, file.%X.decl [concrete = constants.%X]
    151. 

  151. // CHECK:STDOUT:   %x: ref %X = bind_name x, %x.var
    152. 

  152. // CHECK:STDOUT:   return
    153. 

  153. // CHECK:STDOUT: }
    154. 

  154. // CHECK:STDOUT:
    155.