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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gc
import (
"cmd/compile/internal/types"
)
type exporter struct {
marked map[*types.Type]bool // types already seen by markType
}
// markType recursively visits types reachable from t to identify
// functions whose inline bodies may be needed.
func (p *exporter) markType(t *types.Type) {
if p.marked[t] {
return
}
p.marked[t] = true
// If this is a named type, mark all of its associated
// methods. Skip interface types because t.Methods contains
// only their unexpanded method set (i.e., exclusive of
// interface embeddings), and the switch statement below
// handles their full method set.
if t.Sym != nil && t.Etype != TINTER {
for _, m := range t.Methods().Slice() {
if types.IsExported(m.Sym.Name) {
p.markType(m.Type)
}
}
}
// Recursively mark any types that can be produced given a
// value of type t: dereferencing a pointer; indexing or
// iterating over an array, slice, or map; receiving from a
// channel; accessing a struct field or interface method; or
// calling a function.
//
// Notably, we don't mark function parameter types, because
// the user already needs some way to construct values of
// those types.
switch t.Etype {
case TPTR, TARRAY, TSLICE:
p.markType(t.Elem())
case TCHAN:
if t.ChanDir().CanRecv() {
p.markType(t.Elem())
}
case TMAP:
p.markType(t.Key())
p.markType(t.Elem())
case TSTRUCT:
for _, f := range t.FieldSlice() {
if types.IsExported(f.Sym.Name) || f.Embedded != 0 {
p.markType(f.Type)
}
}
case TFUNC:
// If t is the type of a function or method, then
// t.Nname() is its ONAME. Mark its inline body and
// any recursively called functions for export.
inlFlood(asNode(t.Nname()))
for _, f := range t.Results().FieldSlice() {
p.markType(f.Type)
}
case TINTER:
for _, f := range t.FieldSlice() {
if types.IsExported(f.Sym.Name) {
p.markType(f.Type)
}
}
}
}
// deltaNewFile is a magic line delta offset indicating a new file.
// We use -64 because it is rare; see issue 20080 and CL 41619.
// -64 is the smallest int that fits in a single byte as a varint.
const deltaNewFile = -64
// ----------------------------------------------------------------------------
// Export format
// Tags. Must be < 0.
const (
// Objects
packageTag = -(iota + 1)
constTag
typeTag
varTag
funcTag
endTag
// Types
namedTag
arrayTag
sliceTag
dddTag
structTag
pointerTag
signatureTag
interfaceTag
mapTag
chanTag
// Values
falseTag
trueTag
int64Tag
floatTag
fractionTag // not used by gc
complexTag
stringTag
nilTag
unknownTag // not used by gc (only appears in packages with errors)
// Type aliases
aliasTag
)
// untype returns the "pseudo" untyped type for a Ctype (import/export use only).
// (we can't use a pre-initialized array because we must be sure all types are
// set up)
func untype(ctype Ctype) *types.Type {
switch ctype {
case CTINT:
return types.Idealint
case CTRUNE:
return types.Idealrune
case CTFLT:
return types.Idealfloat
case CTCPLX:
return types.Idealcomplex
case CTSTR:
return types.Idealstring
case CTBOOL:
return types.Idealbool
case CTNIL:
return types.Types[TNIL]
}
Fatalf("exporter: unknown Ctype")
return nil
}
var predecl []*types.Type // initialized lazily
func predeclared() []*types.Type {
if predecl == nil {
// initialize lazily to be sure that all
// elements have been initialized before
predecl = []*types.Type{
// basic types
types.Types[TBOOL],
types.Types[TINT],
types.Types[TINT8],
types.Types[TINT16],
types.Types[TINT32],
types.Types[TINT64],
types.Types[TUINT],
types.Types[TUINT8],
types.Types[TUINT16],
types.Types[TUINT32],
types.Types[TUINT64],
types.Types[TUINTPTR],
types.Types[TFLOAT32],
types.Types[TFLOAT64],
types.Types[TCOMPLEX64],
types.Types[TCOMPLEX128],
types.Types[TSTRING],
// basic type aliases
types.Bytetype,
types.Runetype,
// error
types.Errortype,
// untyped types
untype(CTBOOL),
untype(CTINT),
untype(CTRUNE),
untype(CTFLT),
untype(CTCPLX),
untype(CTSTR),
untype(CTNIL),
// package unsafe
types.Types[TUNSAFEPTR],
// invalid type (package contains errors)
types.Types[Txxx],
// any type, for builtin export data
types.Types[TANY],
}
}
return predecl
}
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