Merge "Add sort_bss_symbols_by_size property for shared libs" (6f127a7f) · Commits · e / os / android_build_soong

cc/library.go

+15 −0

Original line number	Diff line number	Diff line
		@@ -110,6 +110,9 @@ type LibraryProperties struct {
		// Symbol tags that should be ignored from the symbol file
		Exclude_symbol_tags []string
		}

		// Order symbols in .bss section by their sizes. Only useful for shared libraries.
		Sort_bss_symbols_by_size *bool
		}

		type LibraryMutatedProperties struct {
		@@ -758,6 +761,18 @@ func (library *libraryDecorator) linkShared(ctx ModuleContext,
		linkerDeps = append(linkerDeps, deps.LateSharedLibsDeps...)
		linkerDeps = append(linkerDeps, objs.tidyFiles...)

		if Bool(library.Properties.Sort_bss_symbols_by_size) {
		unsortedOutputFile := android.PathForModuleOut(ctx, "unsorted", fileName)
		TransformObjToDynamicBinary(ctx, objs.objFiles, sharedLibs,
		deps.StaticLibs, deps.LateStaticLibs, deps.WholeStaticLibs,
		linkerDeps, deps.CrtBegin, deps.CrtEnd, false, builderFlags, unsortedOutputFile, implicitOutputs)

		symbolOrderingFile := android.PathForModuleOut(ctx, "unsorted", fileName+".symbol_order")
		symbolOrderingFlag := library.baseLinker.sortBssSymbolsBySize(ctx, unsortedOutputFile, symbolOrderingFile, builderFlags)
		builderFlags.ldFlags += " " + symbolOrderingFlag
		linkerDeps = append(linkerDeps, symbolOrderingFile)
		}

		TransformObjToDynamicBinary(ctx, objs.objFiles, sharedLibs,
		deps.StaticLibs, deps.LateStaticLibs, deps.WholeStaticLibs,
		linkerDeps, deps.CrtBegin, deps.CrtEnd, false, builderFlags, outputFile, implicitOutputs)

cc/linker.go

+26 −13

Original line number	Diff line number	Diff line
		@@ -147,9 +147,6 @@ type BaseLinkerProperties struct {

		// local file name to pass to the linker as --version_script
		Version_script *string `android:"path,arch_variant"`

		// Local file name to pass to the linker as --symbol-ordering-file
		Symbol_ordering_file *string `android:"arch_variant"`
		}

		func NewBaseLinker(sanitize sanitize) baseLinker {
		@@ -442,16 +439,6 @@ func (linker *baseLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
		}
		}

		if !linker.dynamicProperties.BuildStubs {
		symbolOrderingFile := ctx.ExpandOptionalSource(
		linker.Properties.Symbol_ordering_file, "Symbol_ordering_file")
		if symbolOrderingFile.Valid() {
		flags.LdFlags = append(flags.LdFlags,
		"-Wl,--symbol-ordering-file,"+symbolOrderingFile.String())
		flags.LdFlagsDeps = append(flags.LdFlagsDeps, symbolOrderingFile.Path())
		}
		}

		return flags
		}

		@@ -487,3 +474,29 @@ func (linker *baseLinker) injectVersionSymbol(ctx ModuleContext, in android.Path
		},
		})
		}

		// Rule to generate .bss symbol ordering file.

		var (
		_ = pctx.SourcePathVariable("genSortedBssSymbolsPath", "build/soong/scripts/gen_sorted_bss_symbols.sh")
		gen_sorted_bss_symbols = pctx.AndroidStaticRule("gen_sorted_bss_symbols",
		blueprint.RuleParams{
		Command: "CROSS_COMPILE=$crossCompile $genSortedBssSymbolsPath ${in} ${out}",
		CommandDeps: []string{"$genSortedBssSymbolsPath"},
		},
		"crossCompile")
		)

		func (linker *baseLinker) sortBssSymbolsBySize(ctx ModuleContext, in android.Path, symbolOrderingFile android.ModuleOutPath, flags builderFlags) string {
		crossCompile := gccCmd(flags.toolchain, "")
		ctx.Build(pctx, android.BuildParams{
		Rule: gen_sorted_bss_symbols,
		Description: "generate bss symbol order " + symbolOrderingFile.Base(),
		Output: symbolOrderingFile,
		Input: in,
		Args: map[string]string{
		"crossCompile": crossCompile,
		},
		})
		return "-Wl,--symbol-ordering-file," + symbolOrderingFile.String()
		}

scripts/gen_sorted_bss_symbols.sh

0 → 100755

+28 −0

Original line number	Diff line number	Diff line
		#!/bin/bash -e

		# Copyright 2019 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.

		# Script to generate a symbol ordering file that sorts bss section symbols by
		# their sizes.
		# Inputs:
		# Environment:
		# CROSS_COMPILE: prefix added to nm tools
		# Arguments:
		# $1: Input ELF file
		# $2: Output symbol ordering file

		set -o pipefail

		${CROSS_COMPILE}nm --size-sort $1 \| awk '{if ($2 == "b" \|\| $2 == "B") print $3}' > $2