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      1 // Copyright 2016 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 
     15 package cc
     16 
     17 import (
     18 	"runtime"
     19 
     20 	"github.com/google/blueprint"
     21 
     22 	"android/soong/android"
     23 )
     24 
     25 func init() {
     26 	pctx.SourcePathVariable("relocationPackerCmd", "prebuilts/misc/${config.HostPrebuiltTag}/relocation_packer/relocation_packer")
     27 }
     28 
     29 var relocationPackerRule = pctx.AndroidStaticRule("packRelocations",
     30 	blueprint.RuleParams{
     31 		Command:     "rm -f $out && cp $in $out && $relocationPackerCmd $out",
     32 		CommandDeps: []string{"$relocationPackerCmd"},
     33 	})
     34 
     35 type RelocationPackerProperties struct {
     36 	Pack_relocations *bool `android:"arch_variant"`
     37 
     38 	// This will be true even if we're embedded in Make, in which case
     39 	// we'll defer to make to actually do the packing.
     40 	PackingRelocations bool `blueprint:"mutated"`
     41 }
     42 
     43 type relocationPacker struct {
     44 	Properties RelocationPackerProperties
     45 }
     46 
     47 func (p *relocationPacker) packingInit(ctx BaseModuleContext) {
     48 	enabled := true
     49 	// Relocation packer isn't available on Darwin yet
     50 	if runtime.GOOS == "darwin" {
     51 		enabled = false
     52 	}
     53 	if ctx.Target().Os != android.Android {
     54 		enabled = false
     55 	}
     56 	if ctx.AConfig().Getenv("DISABLE_RELOCATION_PACKER") == "true" {
     57 		enabled = false
     58 	}
     59 	if ctx.sdk() {
     60 		enabled = false
     61 	}
     62 	if p.Properties.Pack_relocations != nil &&
     63 		*p.Properties.Pack_relocations == false {
     64 		enabled = false
     65 	}
     66 
     67 	p.Properties.PackingRelocations = enabled
     68 }
     69 
     70 func (p *relocationPacker) needsPacking(ctx ModuleContext) bool {
     71 	if ctx.AConfig().EmbeddedInMake() {
     72 		return false
     73 	}
     74 	return p.Properties.PackingRelocations
     75 }
     76 
     77 func (p *relocationPacker) pack(ctx ModuleContext, in, out android.ModuleOutPath, flags builderFlags) {
     78 	ctx.ModuleBuild(pctx, android.ModuleBuildParams{
     79 		Rule:        relocationPackerRule,
     80 		Description: "pack relocations",
     81 		Output:      out,
     82 		Input:       in,
     83 	})
     84 }
     85