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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.
// This file implements support functionality for iimport.go.
package importer
import (
"cmd/compile/internal/base"
"cmd/compile/internal/types2"
"fmt"
"go/token"
"internal/pkgbits"
"sync"
)
func assert(p bool) {
base.Assert(p)
}
func errorf(format string, args ...interface{}) {
panic(fmt.Sprintf(format, args...))
}
const deltaNewFile = -64 // see cmd/compile/internal/gc/bexport.go
// Synthesize a token.Pos
type fakeFileSet struct {
fset *token.FileSet
files map[string]*token.File
}
func (s *fakeFileSet) pos(file string, line, column int) token.Pos {
// TODO(mdempsky): Make use of column.
// Since we don't know the set of needed file positions, we
// reserve maxlines positions per file.
const maxlines = 64 * 1024
f := s.files[file]
if f == nil {
f = s.fset.AddFile(file, -1, maxlines)
s.files[file] = f
// Allocate the fake linebreak indices on first use.
// TODO(adonovan): opt: save ~512KB using a more complex scheme?
fakeLinesOnce.Do(func() {
fakeLines = make([]int, maxlines)
for i := range fakeLines {
fakeLines[i] = i
}
})
f.SetLines(fakeLines)
}
if line > maxlines {
line = 1
}
// Treat the file as if it contained only newlines
// and column=1: use the line number as the offset.
return f.Pos(line - 1)
}
var (
fakeLines []int
fakeLinesOnce sync.Once
)
func chanDir(d int) types2.ChanDir {
// tag values must match the constants in cmd/compile/internal/gc/go.go
switch d {
case 1 /* Crecv */ :
return types2.RecvOnly
case 2 /* Csend */ :
return types2.SendOnly
case 3 /* Cboth */ :
return types2.SendRecv
default:
errorf("unexpected channel dir %d", d)
return 0
}
}
var predeclared = []types2.Type{
// basic types
types2.Typ[types2.Bool],
types2.Typ[types2.Int],
types2.Typ[types2.Int8],
types2.Typ[types2.Int16],
types2.Typ[types2.Int32],
types2.Typ[types2.Int64],
types2.Typ[types2.Uint],
types2.Typ[types2.Uint8],
types2.Typ[types2.Uint16],
types2.Typ[types2.Uint32],
types2.Typ[types2.Uint64],
types2.Typ[types2.Uintptr],
types2.Typ[types2.Float32],
types2.Typ[types2.Float64],
types2.Typ[types2.Complex64],
types2.Typ[types2.Complex128],
types2.Typ[types2.String],
// basic type aliases
types2.Universe.Lookup("byte").Type(),
types2.Universe.Lookup("rune").Type(),
// error
types2.Universe.Lookup("error").Type(),
// untyped types
types2.Typ[types2.UntypedBool],
types2.Typ[types2.UntypedInt],
types2.Typ[types2.UntypedRune],
types2.Typ[types2.UntypedFloat],
types2.Typ[types2.UntypedComplex],
types2.Typ[types2.UntypedString],
types2.Typ[types2.UntypedNil],
// package unsafe
types2.Typ[types2.UnsafePointer],
// invalid type
types2.Typ[types2.Invalid], // only appears in packages with errors
// used internally by gc; never used by this package or in .a files
// not to be confused with the universe any
anyType{},
// comparable
types2.Universe.Lookup("comparable").Type(),
// any
types2.Universe.Lookup("any").Type(),
}
type anyType struct{}
func (t anyType) Underlying() types2.Type { return t }
func (t anyType) String() string { return "any" }
// See cmd/compile/internal/noder.derivedInfo.
type derivedInfo struct {
idx pkgbits.Index
needed bool
}
// See cmd/compile/internal/noder.typeInfo.
type typeInfo struct {
idx pkgbits.Index
derived bool
}