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[BOLT] Only link and initialize supported targets ()

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Bolt currently links and initializes all LLVM targets. This
substantially increases the binary size, and link time if LTO is used.

Instead, only link the targets specified by BOLT_TARGETS_TO_BUILD. We
also have to only initialize those targets, so generate a
TargetConfig.def file with the necessary information. The way the
initialization is done mirrors what llvm-exegesis does.

This reduces llvm-bolt size from 137MB to 78MB for me.
This commit is contained in:
Nikita Popov 2025-02-18 09:17:51 +01:00 committed by GitHub
parent 13de15c9c4
commit e235fcb582
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
14 changed files with 96 additions and 47 deletions

8
bolt/CMakeLists.txt

@ -202,3 +202,11 @@ endif()
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/include/bolt/RuntimeLibs/RuntimeLibraryVariables.inc.in
${CMAKE_CURRENT_BINARY_DIR}/include/bolt/RuntimeLibs/RuntimeLibraryVariables.inc @ONLY)
set(BOLT_ENUM_TARGETS "")
foreach(t ${BOLT_TARGETS_TO_BUILD})
set(BOLT_ENUM_TARGETS "${BOLT_ENUM_TARGETS}BOLT_TARGET(${t})\n")
endforeach(t)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/include/bolt/Core/TargetConfig.def.in
${CMAKE_CURRENT_BINARY_DIR}/include/bolt/Core/TargetConfig.def @ONLY)

23
bolt/include/bolt/Core/TargetConfig.def.in Normal file

@ -0,0 +1,23 @@
//===-- TargetConfig.def.in - Information about available targets ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is configured by the build system to define the available bolt
// targets.
//
// The variant of this file not ending with .in has been autogenerated by the
// LLVM build. Do not edit!
//
//===----------------------------------------------------------------------===//
#ifndef BOLT_TARGET
# error Please define the macro BOLT_TARGET(TargetName)
#endif
@BOLT_ENUM_TARGETS@
#undef BOLT_TARGET

2
bolt/tools/binary-analysis/CMakeLists.txt

@ -1,5 +1,5 @@
set(LLVM_LINK_COMPONENTS
${LLVM_TARGETS_TO_BUILD}
${BOLT_TARGETS_TO_BUILD}
MC
Object
Support

14
bolt/tools/binary-analysis/binary-analysis.cpp

@ -88,13 +88,15 @@ int main(int argc, char **argv) {
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
// Initialize targets and assembly printers/parsers.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
#define BOLT_TARGET(target) \
LLVMInitialize##target##TargetInfo(); \
LLVMInitialize##target##TargetMC(); \
LLVMInitialize##target##AsmParser(); \
LLVMInitialize##target##Disassembler(); \
LLVMInitialize##target##Target(); \
LLVMInitialize##target##AsmPrinter();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
#include "bolt/Core/TargetConfig.def"
ParseCommandLine(argc, argv);

2
bolt/tools/driver/CMakeLists.txt

@ -1,5 +1,5 @@
set(LLVM_LINK_COMPONENTS
${LLVM_TARGETS_TO_BUILD}
${BOLT_TARGETS_TO_BUILD}
MC
Object
Support

14
bolt/tools/driver/llvm-bolt.cpp

@ -183,13 +183,15 @@ int main(int argc, char **argv) {
std::string ToolPath = llvm::sys::fs::getMainExecutable(argv[0], nullptr);
// Initialize targets and assembly printers/parsers.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
#define BOLT_TARGET(target) \
LLVMInitialize##target##TargetInfo(); \
LLVMInitialize##target##TargetMC(); \
LLVMInitialize##target##AsmParser(); \
LLVMInitialize##target##Disassembler(); \
LLVMInitialize##target##Target(); \
LLVMInitialize##target##AsmPrinter();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
#include "bolt/Core/TargetConfig.def"
ToolName = argv[0];

2
bolt/tools/heatmap/CMakeLists.txt

@ -1,5 +1,5 @@
set(LLVM_LINK_COMPONENTS
${LLVM_TARGETS_TO_BUILD}
${BOLT_TARGETS_TO_BUILD}
MC
Object
Support

14
bolt/tools/heatmap/heatmap.cpp

@ -76,13 +76,15 @@ int main(int argc, char **argv) {
opts::OutputFilename = "-";
// Initialize targets and assembly printers/parsers.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
#define BOLT_TARGET(target) \
LLVMInitialize##target##TargetInfo(); \
LLVMInitialize##target##TargetMC(); \
LLVMInitialize##target##AsmParser(); \
LLVMInitialize##target##Disassembler(); \
LLVMInitialize##target##Target(); \
LLVMInitialize##target##AsmPrinter();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
#include "bolt/Core/TargetConfig.def"
ToolName = argv[0];
std::string ToolPath = GetExecutablePath(argv[0]);

2
bolt/tools/llvm-bolt-fuzzer/CMakeLists.txt

@ -1,5 +1,5 @@
set(LLVM_LINK_COMPONENTS
${LLVM_TARGETS_TO_BUILD}
${BOLT_TARGETS_TO_BUILD}
)
add_llvm_fuzzer(llvm-bolt-fuzzer

15
bolt/tools/llvm-bolt-fuzzer/llvm-bolt-fuzzer.cpp

@ -58,13 +58,16 @@ extern "C" int LLVMFuzzerTestOneInput(const char *Data, size_t Size) {
extern "C" LLVM_ATTRIBUTE_USED int LLVMFuzzerInitialize(int *argc,
char ***argv) {
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
// Initialize targets and assembly printers/parsers.
#define BOLT_TARGET(target) \
LLVMInitialize##target##TargetInfo(); \
LLVMInitialize##target##TargetMC(); \
LLVMInitialize##target##AsmParser(); \
LLVMInitialize##target##Disassembler(); \
LLVMInitialize##target##Target(); \
LLVMInitialize##target##AsmPrinter();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
#include "bolt/Core/TargetConfig.def"
return 0;
}

15
bolt/unittests/Core/BinaryContext.cpp

@ -27,12 +27,15 @@ struct BinaryContextTester : public testing::TestWithParam<Triple::ArchType> {
protected:
void initalizeLLVM() {
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
#define BOLT_TARGET(target) \
LLVMInitialize##target##TargetInfo(); \
LLVMInitialize##target##TargetMC(); \
LLVMInitialize##target##AsmParser(); \
LLVMInitialize##target##Disassembler(); \
LLVMInitialize##target##Target(); \
LLVMInitialize##target##AsmPrinter();
#include "bolt/Core/TargetConfig.def"
}
void prepareElf() {

2
bolt/unittests/Core/CMakeLists.txt

@ -2,7 +2,7 @@ set(LLVM_LINK_COMPONENTS
DebugInfoDWARF
Object
MC
${LLVM_TARGETS_TO_BUILD}
${BOLT_TARGETS_TO_BUILD}
)
add_bolt_unittest(CoreTests

15
bolt/unittests/Core/MCPlusBuilder.cpp

@ -37,12 +37,15 @@ struct MCPlusBuilderTester : public testing::TestWithParam<Triple::ArchType> {
protected:
void initalizeLLVM() {
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
#define BOLT_TARGET(target) \
LLVMInitialize##target##TargetInfo(); \
LLVMInitialize##target##TargetMC(); \
LLVMInitialize##target##AsmParser(); \
LLVMInitialize##target##Disassembler(); \
LLVMInitialize##target##Target(); \
LLVMInitialize##target##AsmPrinter();
#include "bolt/Core/TargetConfig.def"
}
void prepareElf() {

15
bolt/unittests/Core/MemoryMaps.cpp

@ -38,12 +38,15 @@ struct MemoryMapsTester : public testing::TestWithParam<Triple::ArchType> {
protected:
void initalizeLLVM() {
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
#define BOLT_TARGET(target) \
LLVMInitialize##target##TargetInfo(); \
LLVMInitialize##target##TargetMC(); \
LLVMInitialize##target##AsmParser(); \
LLVMInitialize##target##Disassembler(); \
LLVMInitialize##target##Target(); \
LLVMInitialize##target##AsmPrinter();
#include "bolt/Core/TargetConfig.def"
}
void prepareElf() {