a2f296f054
In lieu of having an environment variable to override prebuilts preferences (for now), fall back to prebuilts whenever the source module is disabled. Complicated source modules (like LLVM) that already have Go logic can then use an environment variariable to disable their source module whenever they want to use prebuilts. Computes UsePrebuilt once using information from both the source and prebuilt modules, and stores the result in the prebuilt module. Test: m -j libLLVM Test: m -j libLLVM FORCE_BUILD_LLVM_COMPONENTS=true Change-Id: Ib0819a03e9492e55f55de3402e05b3a043644a39
121 lines
3.6 KiB
Go
121 lines
3.6 KiB
Go
// Copyright 2016 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 android
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import "github.com/google/blueprint"
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// This file implements common functionality for handling modules that may exist as prebuilts,
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// source, or both.
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var prebuiltDependencyTag blueprint.BaseDependencyTag
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type Prebuilt struct {
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Properties struct {
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Srcs []string `android:"arch_variant"`
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// When prefer is set to true the prebuilt will be used instead of any source module with
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// a matching name.
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Prefer bool `android:"arch_variant"`
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SourceExists bool `blueprint:"mutated"`
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UsePrebuilt bool `blueprint:"mutated"`
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}
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module Module
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}
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func (p *Prebuilt) Name(name string) string {
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return "prebuilt_" + name
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}
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func (p *Prebuilt) Path(ctx ModuleContext) Path {
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if len(p.Properties.Srcs) == 0 {
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ctx.PropertyErrorf("srcs", "missing prebuilt source file")
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return nil
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}
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if len(p.Properties.Srcs) > 1 {
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ctx.PropertyErrorf("srcs", "multiple prebuilt source files")
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return nil
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}
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return PathForModuleSrc(ctx, p.Properties.Srcs[0])
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}
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type PrebuiltInterface interface {
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Module
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Prebuilt() *Prebuilt
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}
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// prebuiltMutator ensures that there is always a module with an undecorated name, and marks
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// prebuilt modules that have both a prebuilt and a source module.
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func prebuiltMutator(ctx BottomUpMutatorContext) {
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if m, ok := ctx.Module().(PrebuiltInterface); ok && m.Prebuilt() != nil {
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p := m.Prebuilt()
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name := m.base().BaseModuleName()
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if ctx.OtherModuleExists(name) {
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ctx.AddReverseDependency(ctx.Module(), prebuiltDependencyTag, name)
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p.Properties.SourceExists = true
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} else {
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ctx.Rename(name)
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}
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}
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}
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// PrebuiltSelectModuleMutator marks prebuilts that are overriding source modules, and disables
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// installing the source module.
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func PrebuiltSelectModuleMutator(ctx TopDownMutatorContext) {
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if s, ok := ctx.Module().(Module); ok {
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ctx.VisitDirectDeps(func(m blueprint.Module) {
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if ctx.OtherModuleDependencyTag(m) == prebuiltDependencyTag {
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p := m.(PrebuiltInterface).Prebuilt()
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if p.usePrebuilt(ctx, s) {
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p.Properties.UsePrebuilt = true
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s.SkipInstall()
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}
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}
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})
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}
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}
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// PrebuiltReplaceMutator replaces dependencies on the source module with dependencies on the
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// prebuilt when both modules exist and the prebuilt should be used. When the prebuilt should not
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// be used, disable installing it.
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func PrebuiltReplaceMutator(ctx BottomUpMutatorContext) {
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if m, ok := ctx.Module().(PrebuiltInterface); ok && m.Prebuilt() != nil {
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p := m.Prebuilt()
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name := m.base().BaseModuleName()
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if p.Properties.UsePrebuilt {
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if p.Properties.SourceExists {
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ctx.ReplaceDependencies(name)
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}
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} else {
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m.SkipInstall()
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}
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}
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}
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// usePrebuilt returns true if a prebuilt should be used instead of the source module. The prebuilt
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// will be used if it is marked "prefer" or if the source module is disabled.
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func (p *Prebuilt) usePrebuilt(ctx TopDownMutatorContext, source Module) bool {
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if len(p.Properties.Srcs) == 0 {
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return false
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}
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// TODO: use p.Properties.Name and ctx.ModuleDir to override preference
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if p.Properties.Prefer {
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return true
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}
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return !source.Enabled()
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}
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