diff options
author | Robert Griesemer <gri@golang.org> | 2021-08-04 18:01:41 -0700 |
---|---|---|
committer | Robert Griesemer <gri@golang.org> | 2021-08-06 20:34:46 +0000 |
commit | 0811108670a178eb3d1403da81bfed20a7ffe1d7 (patch) | |
tree | 0c98b15e0c748abc73828805598ecdef752093b2 /src | |
parent | 93285c89d1146e2698d2b8e5bf45279961f5026e (diff) | |
download | go-0811108670a178eb3d1403da81bfed20a7ffe1d7.tar.gz go-0811108670a178eb3d1403da81bfed20a7ffe1d7.zip |
[dev.typeparams] cmd/compile/internal/types2: fix make with type parameter argument
For make with a type parameter argument, the structural type of
the type parameter's constraint determines what make is making.
Change-Id: I3b48f8ce3236b7624e0638b5f5be208c5915c987
Reviewed-on: https://go-review.googlesource.com/c/go/+/339899
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Diffstat (limited to 'src')
-rw-r--r-- | src/cmd/compile/internal/types2/builtins.go | 42 | ||||
-rw-r--r-- | src/cmd/compile/internal/types2/testdata/check/builtins.go2 | 79 |
2 files changed, 47 insertions, 74 deletions
diff --git a/src/cmd/compile/internal/types2/builtins.go b/src/cmd/compile/internal/types2/builtins.go index e9df605fd1..184cd027cb 100644 --- a/src/cmd/compile/internal/types2/builtins.go +++ b/src/cmd/compile/internal/types2/builtins.go @@ -472,39 +472,21 @@ func (check *Checker) builtin(x *operand, call *syntax.CallExpr, id builtinId) ( return } - min, max := -1, 10 - var valid func(t Type) bool - valid = func(t Type) bool { - var m int - switch t := under(t).(type) { - case *Slice: - m = 2 - case *Map, *Chan: - m = 1 - case *TypeParam: - return t.underIs(valid) - default: - return false - } - if m > min { - min = m - } - if m+1 < max { - max = m + 1 - } - return true - } - - if !valid(T) { + var min int // minimum number of arguments + switch optype(T).(type) { + case *Slice: + min = 2 + case *Map, *Chan: + min = 1 + case *top: + check.errorf(arg0, invalidArg+"cannot make %s; type parameter has no structural type", arg0) + return + default: check.errorf(arg0, invalidArg+"cannot make %s; type must be slice, map, or channel", arg0) return } - if nargs < min || max < nargs { - if min == max { - check.errorf(call, "%v expects %d arguments; found %d", call, min, nargs) - } else { - check.errorf(call, "%v expects %d or %d arguments; found %d", call, min, max, nargs) - } + if nargs < min || min+1 < nargs { + check.errorf(call, invalidOp+"%v expects %d or %d arguments; found %d", call, min, min+1, nargs) return } diff --git a/src/cmd/compile/internal/types2/testdata/check/builtins.go2 b/src/cmd/compile/internal/types2/testdata/check/builtins.go2 index 3881090603..0cfea93bf6 100644 --- a/src/cmd/compile/internal/types2/testdata/check/builtins.go2 +++ b/src/cmd/compile/internal/types2/testdata/check/builtins.go2 @@ -84,50 +84,41 @@ func _[T M4[K, V], K comparable, V any](m T) { // make -type Bmc interface { - ~map[rune]string | ~chan int -} - -type Bms interface { - ~map[string]int | ~[]int -} - -type Bcs interface { - ~chan bool | ~[]float64 -} - -type Bss interface { - ~[]int | ~[]string -} - -func _[T any]() { - _ = make(T /* ERROR invalid argument */) - _ = make(T /* ERROR invalid argument */, 10) - _ = make(T /* ERROR invalid argument */, 10, 20) -} - -func _[T Bmc]() { - _ = make(T) - _ = make(T, 10) - _ = make /* ERROR expects 1 or 2 arguments */ (T, 10, 20) -} - -func _[T Bms]() { - _ = make /* ERROR expects 2 arguments */ (T) - _ = make(T, 10) - _ = make /* ERROR expects 2 arguments */ (T, 10, 20) -} - -func _[T Bcs]() { - _ = make /* ERROR expects 2 arguments */ (T) - _ = make(T, 10) - _ = make /* ERROR expects 2 arguments */ (T, 10, 20) -} - -func _[T Bss]() { - _ = make /* ERROR expects 2 or 3 arguments */ (T) - _ = make(T, 10) - _ = make(T, 10, 20) +func _[ + S1 interface{ []int }, + S2 interface{ []int | chan int }, + + M1 interface{ map[string]int }, + M2 interface{ map[string]int | chan int }, + + C1 interface{ chan int }, + C2 interface{ chan int | chan string }, +]() { + type S0 []int + _ = make([]int, 10) + _ = make(S0, 10) + _ = make(S1, 10) + _ = make /* ERROR not enough arguments */ () + _ = make /* ERROR expects 2 or 3 arguments */ (S1) + _ = make(S1, 10, 20) + _ = make /* ERROR expects 2 or 3 arguments */ (S1, 10, 20, 30) + _ = make(S2 /* ERROR cannot make .* no structural type */ , 10) + + type M0 map[string]int + _ = make(map[string]int) + _ = make(M0) + _ = make(M1) + _ = make(M1, 10) + _ = make/* ERROR expects 1 or 2 arguments */(M1, 10, 20) + _ = make(M2 /* ERROR cannot make .* no structural type */ ) + + type C0 chan int + _ = make(chan int) + _ = make(C0) + _ = make(C1) + _ = make(C1, 10) + _ = make/* ERROR expects 1 or 2 arguments */(C1, 10, 20) + _ = make(C2 /* ERROR cannot make .* no structural type */ ) } // unsafe.Alignof |