mirror of
https://github.com/golang/go
synced 2024-10-01 12:28:37 -06:00
7072253af5
Fix bug: the Signature for an interface method wrapper erroneously had a non-nil receiver. Function: - Set Pkg field non-nil even for wrappers. It is equal to that of the wrapped function. Only wrappers of error.Error (and its embeddings in other interfaces) may have nil. Sanity checker now asserts this. - FullName() now uses .Synthetic field to discriminate synthetic methods, not Pkg==nil. - Fullname() uses new relType() utility to print receiver type name unqualified if it belongs to the same package. (Alloc.String also uses relType utility.) CallCommon: - Description(): fix switch logic broken when we eliminated the Recv field. - better docs. R=david.crawshaw, crawshaw, gri CC=golang-dev https://golang.org/cl/13057043
117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package ssa
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// lvalues are the union of addressable expressions and map-index
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// expressions.
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import (
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"go/ast"
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"go/token"
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"code.google.com/p/go.tools/go/types"
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)
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// An lvalue represents an assignable location that may appear on the
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// left-hand side of an assignment. This is a generalization of a
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// pointer to permit updates to elements of maps.
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//
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type lvalue interface {
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store(fn *Function, v Value) // stores v into the location
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load(fn *Function) Value // loads the contents of the location
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address(fn *Function) Value // address of the location
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typ() types.Type // returns the type of the location
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}
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// An address is an lvalue represented by a true pointer.
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type address struct {
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addr Value
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starPos token.Pos // source position, if from explicit *addr
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expr ast.Expr // source syntax [debug mode]
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object types.Object // source var, if from *ast.Ident
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}
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func (a *address) load(fn *Function) Value {
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load := emitLoad(fn, a.addr)
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load.pos = a.starPos
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return load
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}
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func (a *address) store(fn *Function, v Value) {
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store := emitStore(fn, a.addr, v)
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store.pos = a.starPos
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if a.expr != nil {
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// store.Val is v converted for assignability.
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emitDebugRef(fn, a.expr, store.Val)
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}
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}
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func (a *address) address(fn *Function) Value {
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if a.expr != nil {
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// NB: this kind of DebugRef yields the object's address.
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emitDebugRef(fn, a.expr, a.addr)
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}
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return a.addr
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}
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func (a *address) typ() types.Type {
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return deref(a.addr.Type())
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}
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// An element is an lvalue represented by m[k], the location of an
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// element of a map or string. These locations are not addressable
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// since pointers cannot be formed from them, but they do support
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// load(), and in the case of maps, store().
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//
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type element struct {
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m, k Value // map or string
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t types.Type // map element type or string byte type
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}
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func (e *element) load(fn *Function) Value {
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l := &Lookup{
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X: e.m,
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Index: e.k,
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}
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l.setType(e.t)
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return fn.emit(l)
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}
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func (e *element) store(fn *Function, v Value) {
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fn.emit(&MapUpdate{
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Map: e.m,
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Key: e.k,
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Value: emitConv(fn, v, e.t),
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})
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}
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func (e *element) address(fn *Function) Value {
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panic("map/string elements are not addressable")
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}
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func (e *element) typ() types.Type {
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return e.t
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}
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// A blank is a dummy variable whose name is "_".
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// It is not reified: loads are illegal and stores are ignored.
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//
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type blank struct{}
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func (bl blank) load(fn *Function) Value {
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panic("blank.load is illegal")
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}
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func (bl blank) store(fn *Function, v Value) {
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// no-op
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}
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func (bl blank) address(fn *Function) Value {
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panic("blank var is not addressable")
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}
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func (bl blank) typ() types.Type {
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// This should be the type of the blank Ident; the typechecker
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// doesn't provide this yet, but fortunately, we don't need it
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// yet either.
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panic("blank.typ is unimplemented")
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}
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