wa-lang.org/wazero@v1.0.2/internal/integration_test/spectest/v2/testdata/switch.wast (about)

     1  (module
     2    ;; Statement switch
     3    (func (export "stmt") (param $i i32) (result i32)
     4      (local $j i32)
     5      (local.set $j (i32.const 100))
     6      (block $switch
     7        (block $7
     8          (block $default
     9            (block $6
    10              (block $5
    11                (block $4
    12                  (block $3
    13                    (block $2
    14                      (block $1
    15                        (block $0
    16                          (br_table $0 $1 $2 $3 $4 $5 $6 $7 $default
    17                            (local.get $i)
    18                          )
    19                        ) ;; 0
    20                        (return (local.get $i))
    21                      ) ;; 1
    22                      (nop)
    23                      ;; fallthrough
    24                    ) ;; 2
    25                    ;; fallthrough
    26                  ) ;; 3
    27                  (local.set $j (i32.sub (i32.const 0) (local.get $i)))
    28                  (br $switch)
    29                ) ;; 4
    30                (br $switch)
    31              ) ;; 5
    32              (local.set $j (i32.const 101))
    33              (br $switch)
    34            ) ;; 6
    35            (local.set $j (i32.const 101))
    36            ;; fallthrough
    37          ) ;; default
    38          (local.set $j (i32.const 102))
    39        ) ;; 7
    40        ;; fallthrough
    41      )
    42      (return (local.get $j))
    43    )
    44  
    45    ;; Expression switch
    46    (func (export "expr") (param $i i64) (result i64)
    47      (local $j i64)
    48      (local.set $j (i64.const 100))
    49      (return
    50        (block $switch (result i64)
    51          (block $7
    52            (block $default
    53              (block $4
    54                (block $5
    55                  (block $6
    56                    (block $3
    57                      (block $2
    58                        (block $1
    59                          (block $0
    60                            (br_table $0 $1 $2 $3 $4 $5 $6 $7 $default
    61                              (i32.wrap_i64 (local.get $i))
    62                            )
    63                          ) ;; 0
    64                          (return (local.get $i))
    65                        ) ;; 1
    66                        (nop)
    67                        ;; fallthrough
    68                      ) ;; 2
    69                      ;; fallthrough
    70                    ) ;; 3
    71                    (br $switch (i64.sub (i64.const 0) (local.get $i)))
    72                  ) ;; 6
    73                  (local.set $j (i64.const 101))
    74                  ;; fallthrough
    75                ) ;; 4
    76                ;; fallthrough
    77              ) ;; 5
    78              ;; fallthrough
    79            ) ;; default
    80            (br $switch (local.get $j))
    81          ) ;; 7
    82          (i64.const -5)
    83        )
    84      )
    85    )
    86  
    87    ;; Argument switch
    88    (func (export "arg") (param $i i32) (result i32)
    89      (return
    90        (block $2 (result i32)
    91          (i32.add (i32.const 10)
    92            (block $1 (result i32)
    93              (i32.add (i32.const 100)
    94                (block $0 (result i32)
    95                  (i32.add (i32.const 1000)
    96                    (block $default (result i32)
    97                      (br_table $0 $1 $2 $default
    98                        (i32.mul (i32.const 2) (local.get $i))
    99                        (i32.and (i32.const 3) (local.get $i))
   100                      )
   101                    )
   102                  )
   103                )
   104              )
   105            )
   106          )
   107        )
   108      )
   109    )
   110  
   111    ;; Corner cases
   112    (func (export "corner") (result i32)
   113      (block
   114        (br_table 0 (i32.const 0))
   115      )
   116      (i32.const 1)
   117    )
   118  )
   119  
   120  (assert_return (invoke "stmt" (i32.const 0)) (i32.const 0))
   121  (assert_return (invoke "stmt" (i32.const 1)) (i32.const -1))
   122  (assert_return (invoke "stmt" (i32.const 2)) (i32.const -2))
   123  (assert_return (invoke "stmt" (i32.const 3)) (i32.const -3))
   124  (assert_return (invoke "stmt" (i32.const 4)) (i32.const 100))
   125  (assert_return (invoke "stmt" (i32.const 5)) (i32.const 101))
   126  (assert_return (invoke "stmt" (i32.const 6)) (i32.const 102))
   127  (assert_return (invoke "stmt" (i32.const 7)) (i32.const 100))
   128  (assert_return (invoke "stmt" (i32.const -10)) (i32.const 102))
   129  
   130  (assert_return (invoke "expr" (i64.const 0)) (i64.const 0))
   131  (assert_return (invoke "expr" (i64.const 1)) (i64.const -1))
   132  (assert_return (invoke "expr" (i64.const 2)) (i64.const -2))
   133  (assert_return (invoke "expr" (i64.const 3)) (i64.const -3))
   134  (assert_return (invoke "expr" (i64.const 6)) (i64.const 101))
   135  (assert_return (invoke "expr" (i64.const 7)) (i64.const -5))
   136  (assert_return (invoke "expr" (i64.const -10)) (i64.const 100))
   137  
   138  (assert_return (invoke "arg" (i32.const 0)) (i32.const 110))
   139  (assert_return (invoke "arg" (i32.const 1)) (i32.const 12))
   140  (assert_return (invoke "arg" (i32.const 2)) (i32.const 4))
   141  (assert_return (invoke "arg" (i32.const 3)) (i32.const 1116))
   142  (assert_return (invoke "arg" (i32.const 4)) (i32.const 118))
   143  (assert_return (invoke "arg" (i32.const 5)) (i32.const 20))
   144  (assert_return (invoke "arg" (i32.const 6)) (i32.const 12))
   145  (assert_return (invoke "arg" (i32.const 7)) (i32.const 1124))
   146  (assert_return (invoke "arg" (i32.const 8)) (i32.const 126))
   147  
   148  (assert_return (invoke "corner") (i32.const 1))
   149  
   150  (assert_invalid (module (func (br_table 3 (i32.const 0)))) "unknown label")