Add Relocation Packer support
This only applies to shared libraries on the device, and like stripping,
we'll let make do the actual packing if we're embedded in Make.
Change-Id: I1585d74ecfc41e18dcbb5ffb70005adf007cc941
diff --git a/Android.bp b/Android.bp
index aee9123..0202ea7 100644
--- a/Android.bp
+++ b/Android.bp
@@ -126,6 +126,7 @@
"cc/check.go",
"cc/gen.go",
"cc/makevars.go",
+ "cc/relocation_packer.go",
"cc/sanitize.go",
"cc/stl.go",
"cc/strip.go",
diff --git a/androidmk/cmd/androidmk/android.go b/androidmk/cmd/androidmk/android.go
index 3bda7a9..6646c9d 100644
--- a/androidmk/cmd/androidmk/android.go
+++ b/androidmk/cmd/androidmk/android.go
@@ -70,8 +70,8 @@
"LOCAL_NO_CRT": {"nocrt", bpparser.BoolType},
"LOCAL_ALLOW_UNDEFINED_SYMBOLS": {"allow_undefined_symbols", bpparser.BoolType},
"LOCAL_RTTI_FLAG": {"rtti", bpparser.BoolType},
-
- "LOCAL_NO_STANDARD_LIBRARIES": {"no_standard_libraries", bpparser.BoolType},
+ "LOCAL_NO_STANDARD_LIBRARIES": {"no_standard_libraries", bpparser.BoolType},
+ "LOCAL_PACK_MODULE_RELOCATIONS": {"pack_relocations", bpparser.BoolType},
"LOCAL_EXPORT_PACKAGE_RESOURCES": {"export_package_resources", bpparser.BoolType},
}
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 285a5a7..f446333 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -81,6 +81,7 @@
func (library *libraryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
if !library.static() {
ctx.subAndroidMk(ret, &library.stripper)
+ ctx.subAndroidMk(ret, &library.relocationPacker)
}
if library.static() {
@@ -181,6 +182,15 @@
})
}
+func (packer *relocationPacker) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+ ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) error {
+ if packer.Properties.PackingRelocations {
+ fmt.Fprintln(w, "LOCAL_PACK_MODULE_RELOCATIONS := true")
+ }
+ return nil
+ })
+}
+
func (installer *baseInstaller) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) error {
path := installer.path.RelPathString()
diff --git a/cc/library.go b/cc/library.go
index 5119c90..cc5ff15 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -151,6 +151,7 @@
flagExporter
stripper
+ relocationPacker
// If we're used as a whole_static_lib, our missing dependencies need
// to be given
@@ -177,7 +178,8 @@
return append(props,
&library.Properties,
&library.flagExporter.Properties,
- &library.stripper.StripProperties)
+ &library.stripper.StripProperties,
+ &library.relocationPacker.Properties)
}
func (library *libraryDecorator) linkerFlags(ctx ModuleContext, flags Flags) Flags {
@@ -289,6 +291,8 @@
library.baseInstaller.location = location
library.baseLinker.linkerInit(ctx)
+
+ library.relocationPacker.packingInit(ctx)
}
func (library *libraryDecorator) linkerDeps(ctx BaseModuleContext, deps Deps) Deps {
@@ -386,6 +390,12 @@
builderFlags := flagsToBuilderFlags(flags)
+ if library.relocationPacker.needsPacking(ctx) {
+ packedOutputFile := outputFile
+ outputFile = android.PathForModuleOut(ctx, "unpacked", fileName)
+ library.relocationPacker.pack(ctx, outputFile, packedOutputFile, builderFlags)
+ }
+
if library.stripper.needsStrip(ctx) {
strippedOutputFile := outputFile
outputFile = android.PathForModuleOut(ctx, "unstripped", fileName)
diff --git a/cc/relocation_packer.go b/cc/relocation_packer.go
new file mode 100644
index 0000000..c509f31
--- /dev/null
+++ b/cc/relocation_packer.go
@@ -0,0 +1,84 @@
+// Copyright 2016 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cc
+
+import (
+ "runtime"
+
+ "github.com/google/blueprint"
+
+ "android/soong/android"
+)
+
+func init() {
+ pctx.SourcePathVariable("relocationPackerCmd", "prebuilts/misc/${config.HostPrebuiltTag}/relocation_packer/relocation_packer")
+}
+
+var relocationPackerRule = pctx.AndroidStaticRule("packRelocations",
+ blueprint.RuleParams{
+ Command: "rm -f $out && cp $in $out && $relocationPackerCmd $out",
+ CommandDeps: []string{"$relocationPackerCmd"},
+ Description: "pack relocations $out",
+ })
+
+type RelocationPackerProperties struct {
+ Pack_relocations *bool `android:"arch_variant"`
+
+ // This will be true even if we're embedded in Make, in which case
+ // we'll defer to make to actually do the packing.
+ PackingRelocations bool `blueprint:"mutated"`
+}
+
+type relocationPacker struct {
+ Properties RelocationPackerProperties
+}
+
+func (p *relocationPacker) packingInit(ctx BaseModuleContext) {
+ enabled := true
+ // Relocation packer isn't available on Darwin yet
+ if runtime.GOOS == "darwin" {
+ enabled = false
+ }
+ if ctx.Target().Os != android.Android {
+ enabled = false
+ }
+ if ctx.AConfig().Getenv("DISABLE_RELOCATION_PACKER") == "true" {
+ enabled = false
+ }
+ if ctx.sdk() {
+ enabled = false
+ }
+ if p.Properties.Pack_relocations != nil &&
+ *p.Properties.Pack_relocations == false {
+ enabled = false
+ }
+
+ p.Properties.PackingRelocations = enabled
+}
+
+func (p *relocationPacker) needsPacking(ctx ModuleContext) bool {
+ if ctx.AConfig().EmbeddedInMake() {
+ return false
+ }
+ return p.Properties.PackingRelocations
+}
+
+func (p *relocationPacker) pack(ctx ModuleContext, in, out android.ModuleOutPath, flags builderFlags) {
+ ctx.ModuleBuild(pctx, android.ModuleBuildParams{
+ Rule: relocationPackerRule,
+ Output: out,
+ Input: in,
+ })
+}