mirror of
https://github.com/golang/go
synced 2024-11-19 04:14:45 -07:00
4da31df1c8
We now use LookupFieldOrMethod for all SelectorExprs, and
simplify the logic to discriminate the various cases.
We inline static calls to promoted/indirected functions,
dramatically reducing the number of functions created.
More tests are needed, but I'd like to submit this as-is.
In this CL, we:
- rely less on Id strings. Internally we now use
*types.Method (and its components) almost everywhere.
- stop thinking of types.Methods as objects. They don't
have stable identities. (Hopefully they will become
plain-old structs soon.)
- eliminate receiver indirection wrappers:
indirection and promotion are handled together by makeWrapper.
- Handle the interactions of promotion, indirection and
abstract methods much more cleanly.
- support receiver-bound interface method closures.
- break up builder.selectField so we can re-use parts
(emitFieldSelection).
- add importer.PackageInfo.classifySelector utility.
- delete interfaceMethodIndex()
- delete namedTypeMethodIndex()
- delete isSuperInterface() (replaced by types.IsAssignable)
- call memberFromObject on each declared concrete method's
*types.Func, not on every Method frem each method set, in the
CREATE phase for packages loaded by gcimporter.
go/types:
- document Func, Signature.Recv() better.
- use fmt in {Package,Label}.String
- reimplement Func.String to be prettier and to include method
receivers.
API changes:
- Function.method now holds the types.Method (soon to be
not-an-object) for synthetic wrappers.
- CallCommon.Method now contains an abstract (interface)
method object; was an abstract method index.
- CallCommon.MethodId() gone.
- Program.LookupMethod now takes a *Method not an Id string.
R=gri
CC=golang-dev
https://golang.org/cl/11674043
100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
package ssa
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// This file defines a number of miscellaneous utility functions.
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import (
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"fmt"
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"go/ast"
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"io"
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"os"
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"code.google.com/p/go.tools/go/types"
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)
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func unreachable() {
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panic("unreachable")
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}
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//// AST utilities
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// unparen returns e with any enclosing parentheses stripped.
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func unparen(e ast.Expr) ast.Expr {
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for {
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p, ok := e.(*ast.ParenExpr)
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if !ok {
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break
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}
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e = p.X
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}
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return e
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}
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// isBlankIdent returns true iff e is an Ident with name "_".
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// They have no associated types.Object, and thus no type.
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//
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func isBlankIdent(e ast.Expr) bool {
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id, ok := e.(*ast.Ident)
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return ok && id.Name == "_"
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}
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//// Type utilities. Some of these belong in go/types.
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// isPointer returns true for types whose underlying type is a pointer.
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func isPointer(typ types.Type) bool {
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_, ok := typ.Underlying().(*types.Pointer)
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return ok
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}
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// deref returns a pointer's element type; otherwise it returns typ.
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func deref(typ types.Type) types.Type {
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if p, ok := typ.Underlying().(*types.Pointer); ok {
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return p.Elem()
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}
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return typ
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}
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// DefaultType returns the default "typed" type for an "untyped" type;
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// it returns the incoming type for all other types. The default type
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// for untyped nil is untyped nil.
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//
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// Exported to exp/ssa/interp.
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//
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// TODO(gri): this is a copy of go/types.defaultType; export that function.
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//
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func DefaultType(typ types.Type) types.Type {
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if t, ok := typ.(*types.Basic); ok {
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k := t.Kind()
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switch k {
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case types.UntypedBool:
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k = types.Bool
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case types.UntypedInt:
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k = types.Int
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case types.UntypedRune:
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k = types.Rune
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case types.UntypedFloat:
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k = types.Float64
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case types.UntypedComplex:
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k = types.Complex128
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case types.UntypedString:
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k = types.String
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}
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typ = types.Typ[k]
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}
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return typ
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}
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// logStack prints the formatted "start" message to stderr and
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// returns a closure that prints the corresponding "end" message.
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// Call using 'defer logStack(...)()' to show builder stack on panic.
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// Don't forget trailing parens!
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//
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func logStack(format string, args ...interface{}) func() {
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msg := fmt.Sprintf(format, args...)
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io.WriteString(os.Stderr, msg)
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io.WriteString(os.Stderr, "\n")
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return func() {
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io.WriteString(os.Stderr, msg)
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io.WriteString(os.Stderr, " end\n")
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}
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}
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