diff options
Diffstat (limited to 'src/cmd/compile/internal/types/type.go')
| -rw-r--r-- | src/cmd/compile/internal/types/type.go | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/src/cmd/compile/internal/types/type.go b/src/cmd/compile/internal/types/type.go index 1a9aa6916a..d3c02fc56d 100644 --- a/src/cmd/compile/internal/types/type.go +++ b/src/cmd/compile/internal/types/type.go @@ -151,7 +151,7 @@ type Type struct { // TARRAY: *Array // TSLICE: Slice // TSSA: string - // TTYPEPARAM: *Interface (though we may not need to store/use the Interface info) + // TTYPEPARAM: *Typeparam Extra interface{} // Width is the width of this Type in bytes. @@ -377,6 +377,12 @@ type Interface struct { pkg *Pkg } +// Typeparam contains Type fields specific to typeparam types. +type Typeparam struct { + index int // type parameter index in source order, starting at 0 + bound *Type +} + // Ptr contains Type fields specific to pointer types. type Ptr struct { Elem *Type // element type @@ -558,7 +564,7 @@ func New(et Kind) *Type { case TRESULTS: t.Extra = new(Results) case TTYPEPARAM: - t.Extra = new(Interface) + t.Extra = new(Typeparam) } return t } @@ -825,6 +831,8 @@ func (t *Type) copy() *Type { case TARRAY: x := *t.Extra.(*Array) nt.Extra = &x + case TTYPEPARAM: + base.Fatalf("typeparam types cannot be copied") case TTUPLE, TSSA, TRESULTS: base.Fatalf("ssa types cannot be copied") } @@ -1766,14 +1774,34 @@ func NewInterface(pkg *Pkg, methods []*Field) *Type { return t } -// NewTypeParam returns a new type param. -func NewTypeParam(pkg *Pkg) *Type { +// NewTypeParam returns a new type param with the specified sym (package and name) +// and specified index within the typeparam list. +func NewTypeParam(sym *Sym, index int) *Type { t := New(TTYPEPARAM) - t.Extra.(*Interface).pkg = pkg + t.sym = sym + t.Extra.(*Typeparam).index = index t.SetHasTParam(true) return t } +// Index returns the index of the type param within its param list. +func (t *Type) Index() int { + t.wantEtype(TTYPEPARAM) + return t.Extra.(*Typeparam).index +} + +// SetBound sets the bound of a typeparam. +func (t *Type) SetBound(bound *Type) { + t.wantEtype(TTYPEPARAM) + t.Extra.(*Typeparam).bound = bound +} + +// Bound returns the bound of a typeparam. +func (t *Type) Bound() *Type { + t.wantEtype(TTYPEPARAM) + return t.Extra.(*Typeparam).bound +} + const BOGUS_FUNARG_OFFSET = -1000000000 func unzeroFieldOffsets(f []*Field) { |