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[dev.typeparams] cmd/compile/internal/types2: move Signature type decl into signature.go (cleanup)
Change-Id: I68c9da6a87cdc15bde8bffa8cb86fb8705eb1f8e Reviewed-on: https://go-review.googlesource.com/c/go/+/332091 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Robert Griesemer
parent
1aadb18f83
commit
0e0b80cb56
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@ -9,6 +9,77 @@ import (
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"fmt"
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)
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// ----------------------------------------------------------------------------
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// API
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// A Signature represents a (non-builtin) function or method type.
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// The receiver is ignored when comparing signatures for identity.
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type Signature struct {
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// We need to keep the scope in Signature (rather than passing it around
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// and store it in the Func Object) because when type-checking a function
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// literal we call the general type checker which returns a general Type.
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// We then unpack the *Signature and use the scope for the literal body.
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rparams []*TypeName // receiver type parameters from left to right; or nil
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tparams []*TypeName // type parameters from left to right; or nil
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scope *Scope // function scope, present for package-local signatures
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recv *Var // nil if not a method
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params *Tuple // (incoming) parameters from left to right; or nil
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results *Tuple // (outgoing) results from left to right; or nil
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variadic bool // true if the last parameter's type is of the form ...T (or string, for append built-in only)
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}
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// NewSignature returns a new function type for the given receiver, parameters,
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// and results, either of which may be nil. If variadic is set, the function
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// is variadic, it must have at least one parameter, and the last parameter
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// must be of unnamed slice type.
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func NewSignature(recv *Var, params, results *Tuple, variadic bool) *Signature {
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if variadic {
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n := params.Len()
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if n == 0 {
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panic("types2.NewSignature: variadic function must have at least one parameter")
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}
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if _, ok := params.At(n - 1).typ.(*Slice); !ok {
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panic("types2.NewSignature: variadic parameter must be of unnamed slice type")
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}
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}
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return &Signature{recv: recv, params: params, results: results, variadic: variadic}
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}
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// Recv returns the receiver of signature s (if a method), or nil if a
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// function. It is ignored when comparing signatures for identity.
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//
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// For an abstract method, Recv returns the enclosing interface either
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// as a *Named or an *Interface. Due to embedding, an interface may
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// contain methods whose receiver type is a different interface.
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func (s *Signature) Recv() *Var { return s.recv }
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// TParams returns the type parameters of signature s, or nil.
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func (s *Signature) TParams() []*TypeName { return s.tparams }
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// RParams returns the receiver type params of signature s, or nil.
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func (s *Signature) RParams() []*TypeName { return s.rparams }
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// SetTParams sets the type parameters of signature s.
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func (s *Signature) SetTParams(tparams []*TypeName) { s.tparams = tparams }
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// SetRParams sets the receiver type params of signature s.
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func (s *Signature) SetRParams(rparams []*TypeName) { s.rparams = rparams }
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// Params returns the parameters of signature s, or nil.
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func (s *Signature) Params() *Tuple { return s.params }
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// Results returns the results of signature s, or nil.
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func (s *Signature) Results() *Tuple { return s.results }
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// Variadic reports whether the signature s is variadic.
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func (s *Signature) Variadic() bool { return s.variadic }
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func (s *Signature) Underlying() Type { return s }
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func (s *Signature) String() string { return TypeString(s, nil) }
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// ----------------------------------------------------------------------------
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// Implementation
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// Disabled by default, but enabled when running tests (via types_test.go).
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var acceptMethodTypeParams bool
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@ -163,68 +163,6 @@ func (t *Tuple) Len() int {
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// At returns the i'th variable of tuple t.
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func (t *Tuple) At(i int) *Var { return t.vars[i] }
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// A Signature represents a (non-builtin) function or method type.
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// The receiver is ignored when comparing signatures for identity.
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type Signature struct {
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// We need to keep the scope in Signature (rather than passing it around
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// and store it in the Func Object) because when type-checking a function
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// literal we call the general type checker which returns a general Type.
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// We then unpack the *Signature and use the scope for the literal body.
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rparams []*TypeName // receiver type parameters from left to right; or nil
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tparams []*TypeName // type parameters from left to right; or nil
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scope *Scope // function scope, present for package-local signatures
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recv *Var // nil if not a method
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params *Tuple // (incoming) parameters from left to right; or nil
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results *Tuple // (outgoing) results from left to right; or nil
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variadic bool // true if the last parameter's type is of the form ...T (or string, for append built-in only)
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}
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// NewSignature returns a new function type for the given receiver, parameters,
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// and results, either of which may be nil. If variadic is set, the function
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// is variadic, it must have at least one parameter, and the last parameter
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// must be of unnamed slice type.
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func NewSignature(recv *Var, params, results *Tuple, variadic bool) *Signature {
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if variadic {
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n := params.Len()
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if n == 0 {
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panic("types2.NewSignature: variadic function must have at least one parameter")
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}
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if _, ok := params.At(n - 1).typ.(*Slice); !ok {
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panic("types2.NewSignature: variadic parameter must be of unnamed slice type")
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}
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}
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return &Signature{recv: recv, params: params, results: results, variadic: variadic}
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}
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// Recv returns the receiver of signature s (if a method), or nil if a
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// function. It is ignored when comparing signatures for identity.
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//
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// For an abstract method, Recv returns the enclosing interface either
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// as a *Named or an *Interface. Due to embedding, an interface may
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// contain methods whose receiver type is a different interface.
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func (s *Signature) Recv() *Var { return s.recv }
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// TParams returns the type parameters of signature s, or nil.
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func (s *Signature) TParams() []*TypeName { return s.tparams }
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// RParams returns the receiver type params of signature s, or nil.
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func (s *Signature) RParams() []*TypeName { return s.rparams }
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// SetTParams sets the type parameters of signature s.
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func (s *Signature) SetTParams(tparams []*TypeName) { s.tparams = tparams }
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// SetRParams sets the receiver type params of signature s.
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func (s *Signature) SetRParams(rparams []*TypeName) { s.rparams = rparams }
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// Params returns the parameters of signature s, or nil.
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func (s *Signature) Params() *Tuple { return s.params }
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// Results returns the results of signature s, or nil.
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func (s *Signature) Results() *Tuple { return s.results }
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// Variadic reports whether the signature s is variadic.
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func (s *Signature) Variadic() bool { return s.variadic }
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// An Interface represents an interface type.
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type Interface struct {
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obj *TypeName // corresponding declared object; or nil (for better error messages)
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@ -706,7 +644,6 @@ func (t *Array) Underlying() Type { return t }
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func (t *Slice) Underlying() Type { return t }
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func (t *Pointer) Underlying() Type { return t }
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func (t *Tuple) Underlying() Type { return t }
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func (t *Signature) Underlying() Type { return t }
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func (t *Interface) Underlying() Type { return t }
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func (t *Map) Underlying() Type { return t }
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func (t *Chan) Underlying() Type { return t }
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@ -721,7 +658,6 @@ func (t *Array) String() string { return TypeString(t, nil) }
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func (t *Slice) String() string { return TypeString(t, nil) }
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func (t *Pointer) String() string { return TypeString(t, nil) }
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func (t *Tuple) String() string { return TypeString(t, nil) }
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func (t *Signature) String() string { return TypeString(t, nil) }
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func (t *Interface) String() string { return TypeString(t, nil) }
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func (t *Map) String() string { return TypeString(t, nil) }
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func (t *Chan) String() string { return TypeString(t, nil) }
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