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go/types: implement SizesFor convenience function

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SizesFor returns a Sizes implementation for a supported architecture.
Use functionality in srcimporter.

Change-Id: I197e641b419c678030dfaab5c5b8c569fd0410f3
Reviewed-on: https://go-review.googlesource.com/37583
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Robert Griesemer 2017-02-28 13:18:55 -08:00
parent 83bc4a2fee
commit 45055f21ab
3 changed files with 29 additions and 20 deletions
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19
src/go/internal/srcimporter/srcimporter.go
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@ -34,7 +34,7 @@ func New(ctxt *build.Context, fset *token.FileSet, packages map[string]*types.Pa
return &Importer{
ctxt: ctxt,
fset: fset,
sizes: archSizes[ctxt.GOARCH], // use go/types default if GOARCH not found (map access returns nil)
sizes: types.SizesFor(ctxt.GOARCH), // uses go/types default if GOARCH not found
packages: packages,
}
}
@ -180,20 +180,3 @@ func (p *Importer) joinPath(elem ...string) string {
}
return filepath.Join(elem...)
}
// common architecture word sizes and alignments
// TODO(gri) consider making this available via go/types
var archSizes = map[string]*types.StdSizes{
"386": {WordSize: 4, MaxAlign: 4},
"arm": {WordSize: 4, MaxAlign: 4},
"arm64": {WordSize: 8, MaxAlign: 8},
"amd64": {WordSize: 8, MaxAlign: 8},
"amd64p32": {WordSize: 4, MaxAlign: 8},
"mips": {WordSize: 4, MaxAlign: 4},
"mipsle": {WordSize: 4, MaxAlign: 4},
"mips64": {WordSize: 8, MaxAlign: 8},
"mips64le": {WordSize: 8, MaxAlign: 8},
"ppc64": {WordSize: 8, MaxAlign: 8},
"ppc64le": {WordSize: 8, MaxAlign: 8},
"s390x": {WordSize: 8, MaxAlign: 8},
}

2
src/go/types/api.go
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@ -121,7 +121,7 @@ type Config struct {
Importer Importer
// If Sizes != nil, it provides the sizing functions for package unsafe.
// Otherwise &StdSizes{WordSize: 8, MaxAlign: 8} is used instead.
// Otherwise SizesFor("amd64") is used instead.
Sizes Sizes
// If DisableUnusedImportCheck is set, packages are not checked

28
src/go/types/sizes.go
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@ -153,8 +153,34 @@ func (s *StdSizes) Sizeof(T Type) int64 {
return s.WordSize // catch-all
}
// common architecture word sizes and alignments
var archSizes = map[string]*StdSizes{
"386": {4, 4},
"arm": {4, 4},
"arm64": {8, 8},
"amd64": {8, 8},
"amd64p32": {4, 8},
"mips": {4, 4},
"mipsle": {4, 4},
"mips64": {8, 8},
"mips64le": {8, 8},
"ppc64": {8, 8},
"ppc64le": {8, 8},
"s390x": {8, 8},
// When adding more architectures here,
// update the doc string of SizesFor below.
}
// SizesFor returns the Sizes for one of these architectures:
// "386", "arm", "arm64", "amd64", "amd64p32", "mips", "mipsle",
// "mips64", "mips64le", "ppc64", "ppc64le", "s390x".
// The result is nil if an architecture is not known.
func SizesFor(arch string) Sizes {
return archSizes[arch]
}
// stdSizes is used if Config.Sizes == nil.
var stdSizes = StdSizes{8, 8}
var stdSizes = SizesFor("amd64")
func (conf *Config) alignof(T Type) int64 {
if s := conf.Sizes; s != nil {