80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
// Copyright 2018 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cc
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import (
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"android/soong/android"
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)
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type XomProperties struct {
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Xom *bool
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}
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type xom struct {
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Properties XomProperties
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}
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func (xom *xom) props() []interface{} {
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return []interface{}{&xom.Properties}
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}
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func (xom *xom) begin(ctx BaseModuleContext) {}
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func (xom *xom) deps(ctx BaseModuleContext, deps Deps) Deps {
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return deps
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}
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func (xom *xom) flags(ctx ModuleContext, flags Flags) Flags {
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disableXom := false
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if !ctx.Config().EnableXOM() || ctx.Config().XOMDisabledForPath(ctx.ModuleDir()) {
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disableXom = true
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}
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if xom.Properties.Xom != nil && !*xom.Properties.Xom {
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return flags
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}
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// If any static dependencies have XOM disabled, we should disable XOM in this module,
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// the assumption being if it's been explicitly disabled then there's probably incompatible
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// code in the library which may get pulled in.
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if !disableXom {
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ctx.VisitDirectDeps(func(m android.Module) {
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cc, ok := m.(*Module)
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if !ok || cc.xom == nil || !cc.static() {
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return
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}
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if cc.xom.Properties.Xom != nil && !*cc.xom.Properties.Xom {
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disableXom = true
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return
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}
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})
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}
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// Enable execute-only if none of the dependencies disable it,
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// also if it's explicitly set true (allows overriding dependencies disabling it).
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if !disableXom || (xom.Properties.Xom != nil && *xom.Properties.Xom) {
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// XOM is only supported on AArch64 when using lld.
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if ctx.Arch().ArchType == android.Arm64 && ctx.useClangLld(ctx) {
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flags.Local.LdFlags = append(flags.Local.LdFlags,
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"-Wl,--execute-only",
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"-Wl,-z,separate-code",
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)
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}
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}
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return flags
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}
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