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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
//===- context.go - Build context utilities for llgo ----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Build context utilities for llgo.
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//
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//===----------------------------------------------------------------------===//
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package build
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import (
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"errors"
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"go/build"
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"regexp"
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"strings"
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)
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type Context struct {
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build.Context
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// LLVM triple
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Triple string
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}
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// ContextFromTriple returns a new go/build.Context with GOOS and GOARCH
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// configured from the given triple.
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func ContextFromTriple(triple string) (*Context, error) {
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goos, goarch, err := parseTriple(triple)
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if err != nil {
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return nil, err
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}
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ctx := &Context{Context: build.Default, Triple: triple}
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ctx.GOOS = goos
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ctx.GOARCH = goarch
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ctx.BuildTags = append(ctx.BuildTags, "llgo")
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if triple == "pnacl" {
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ctx.BuildTags = append(ctx.BuildTags, "pnacl")
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}
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return ctx, nil
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}
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func parseTriple(triple string) (goos string, goarch string, err error) {
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if strings.ToLower(triple) == "pnacl" {
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return "nacl", "le32", nil
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}
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type REs struct{ re, out string }
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// reference: http://llvm.org/docs/doxygen/html/Triple_8cpp_source.html
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goarchREs := []REs{
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{"amd64|x86_64", "amd64"},
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{"i[3-9]86", "386"},
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{"xscale|((arm|thumb)(v.*)?)", "arm"},
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}
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goosREs := []REs{
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{"linux.*", "linux"},
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{"(darwin|macosx|ios).*", "darwin"},
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{"k?freebsd.*", "freebsd"},
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{"netbsd.*", "netbsd"},
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{"openbsd.*", "openbsd"},
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}
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match := func(list []REs, s string) string {
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for _, t := range list {
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if matched, _ := regexp.MatchString(t.re, s); matched {
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return t.out
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}
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}
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return ""
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}
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s := strings.Split(triple, "-")
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switch l := len(s); l {
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default:
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return "", "", errors.New("triple should be made up of 2, 3, or 4 parts.")
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case 2, 3: // ARCHITECTURE-(VENDOR-)OPERATING_SYSTEM
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goarch = s[0]
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goos = s[l-1]
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case 4: // ARCHITECTURE-VENDOR-OPERATING_SYSTEM-ENVIRONMENT
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goarch = s[0]
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goos = s[2]
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}
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goarch = match(goarchREs, goarch)
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if goarch == "" {
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return "", "", errors.New("unknown architecture in triple")
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}
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goos = match(goosREs, goos)
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if goos == "" {
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return "", "", errors.New("unknown OS in triple")
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}
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return goos, goarch, nil
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}
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