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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 	"fmt"
     19 
     20 	"android/soong/android"
     21 )
     22 
     23 //
     24 // Objects (for crt*.o)
     25 //
     26 
     27 func init() {
     28 	android.RegisterModuleType("cc_object", objectFactory)
     29 }
     30 
     31 type objectLinker struct {
     32 	*baseLinker
     33 	Properties ObjectLinkerProperties
     34 }
     35 
     36 func objectFactory() android.Module {
     37 	module := newBaseModule(android.HostAndDeviceSupported, android.MultilibBoth)
     38 	module.linker = &objectLinker{
     39 		baseLinker: NewBaseLinker(),
     40 	}
     41 	module.compiler = NewBaseCompiler()
     42 	return module.Init()
     43 }
     44 
     45 func (object *objectLinker) appendLdflags(flags []string) {
     46 	panic(fmt.Errorf("appendLdflags on objectLinker not supported"))
     47 }
     48 
     49 func (object *objectLinker) linkerProps() []interface{} {
     50 	return []interface{}{&object.Properties}
     51 }
     52 
     53 func (*objectLinker) linkerInit(ctx BaseModuleContext) {}
     54 
     55 func (object *objectLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
     56 	if ctx.useVndk() && ctx.toolchain().Bionic() {
     57 		// Needed for VNDK builds where bionic headers aren't automatically added.
     58 		deps.LateSharedLibs = append(deps.LateSharedLibs, "libc")
     59 	}
     60 
     61 	deps.ObjFiles = append(deps.ObjFiles, object.Properties.Objs...)
     62 	return deps
     63 }
     64 
     65 func (*objectLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
     66 	if flags.Clang {
     67 		flags.LdFlags = append(flags.LdFlags, ctx.toolchain().ToolchainClangLdflags())
     68 	} else {
     69 		flags.LdFlags = append(flags.LdFlags, ctx.toolchain().ToolchainLdflags())
     70 	}
     71 
     72 	return flags
     73 }
     74 
     75 func (object *objectLinker) link(ctx ModuleContext,
     76 	flags Flags, deps PathDeps, objs Objects) android.Path {
     77 
     78 	objs = objs.Append(deps.Objs)
     79 
     80 	var outputFile android.Path
     81 	builderFlags := flagsToBuilderFlags(flags)
     82 
     83 	if len(objs.objFiles) == 1 {
     84 		outputFile = objs.objFiles[0]
     85 
     86 		if String(object.Properties.Prefix_symbols) != "" {
     87 			output := android.PathForModuleOut(ctx, ctx.ModuleName()+objectExtension)
     88 			TransformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), outputFile,
     89 				builderFlags, output)
     90 			outputFile = output
     91 		}
     92 	} else {
     93 		output := android.PathForModuleOut(ctx, ctx.ModuleName()+objectExtension)
     94 		outputFile = output
     95 
     96 		if String(object.Properties.Prefix_symbols) != "" {
     97 			input := android.PathForModuleOut(ctx, "unprefixed", ctx.ModuleName()+objectExtension)
     98 			TransformBinaryPrefixSymbols(ctx, String(object.Properties.Prefix_symbols), input,
     99 				builderFlags, output)
    100 			output = input
    101 		}
    102 
    103 		TransformObjsToObj(ctx, objs.objFiles, builderFlags, output)
    104 	}
    105 
    106 	ctx.CheckbuildFile(outputFile)
    107 	return outputFile
    108 }
    109