blob: 9337990f85f4833ade74b9240bf6ef94fd4e1c7d [file] [log] [blame]
Ivan Lozano074ec482018-11-21 08:59:37 -08001// Copyright 2018 Google Inc. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package cc
16
17import (
18 "android/soong/android"
19)
20
21type XomProperties struct {
22 Xom *bool
23}
24
25type xom struct {
26 Properties XomProperties
27}
28
29func (xom *xom) props() []interface{} {
30 return []interface{}{&xom.Properties}
31}
32
33func (xom *xom) begin(ctx BaseModuleContext) {}
34
35func (xom *xom) deps(ctx BaseModuleContext, deps Deps) Deps {
36 return deps
37}
38
39func (xom *xom) flags(ctx ModuleContext, flags Flags) Flags {
40 disableXom := false
41
42 if !ctx.Config().EnableXOM() || ctx.Config().XOMDisabledForPath(ctx.ModuleDir()) {
43 disableXom = true
44 }
45
46 if xom.Properties.Xom != nil && !*xom.Properties.Xom {
47 return flags
48 }
49
50 // If any static dependencies have XOM disabled, we should disable XOM in this module,
51 // the assumption being if it's been explicitly disabled then there's probably incompatible
52 // code in the library which may get pulled in.
Ivan Lozano59a7ae92019-01-31 10:09:13 -080053 if !disableXom {
Ivan Lozano074ec482018-11-21 08:59:37 -080054 ctx.VisitDirectDeps(func(m android.Module) {
55 cc, ok := m.(*Module)
56 if !ok || cc.xom == nil || !cc.static() {
57 return
58 }
59 if cc.xom.Properties.Xom != nil && !*cc.xom.Properties.Xom {
60 disableXom = true
61 return
62 }
63 })
64 }
65
66 // Enable execute-only if none of the dependencies disable it,
67 // also if it's explicitly set true (allows overriding dependencies disabling it).
68 if !disableXom || (xom.Properties.Xom != nil && *xom.Properties.Xom) {
Ivan Lozanobd721262018-11-27 14:33:03 -080069 // XOM is only supported on AArch64 when using lld.
70 if ctx.Arch().ArchType == android.Arm64 && ctx.useClangLld(ctx) {
Ivan Lozano074ec482018-11-21 08:59:37 -080071 flags.LdFlags = append(flags.LdFlags, "-Wl,-execute-only")
72 }
73 }
74
75 return flags
76}