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nikicnikic
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[BOLT] Only link and initialize supported targets (#127509)
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.
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14 files changed

+99
-50
lines changed

14 files changed

+99
-50
lines changed

‎bolt/CMakeLists.txt

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

‎bolt/include/bolt/Core/TargetConfig.def.in

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

‎bolt/tools/binary-analysis/CMakeLists.txt

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@@ -1,5 +1,5 @@
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set(LLVM_LINK_COMPONENTS
2-
${LLVM_TARGETS_TO_BUILD}
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${BOLT_TARGETS_TO_BUILD}
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MC
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Object
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Support

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

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

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@@ -1,5 +1,5 @@
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set(LLVM_LINK_COMPONENTS
2-
${LLVM_TARGETS_TO_BUILD}
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${BOLT_TARGETS_TO_BUILD}
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MC
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Object
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Support

‎bolt/tools/driver/llvm-bolt.cpp

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

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@@ -1,5 +1,5 @@
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set(LLVM_LINK_COMPONENTS
2-
${LLVM_TARGETS_TO_BUILD}
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${BOLT_TARGETS_TO_BUILD}
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MC
44
Object
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Support

‎bolt/tools/heatmap/heatmap.cpp

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

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

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@@ -1,5 +1,5 @@
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set(LLVM_LINK_COMPONENTS
2-
${LLVM_TARGETS_TO_BUILD}
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${BOLT_TARGETS_TO_BUILD}
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)
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add_llvm_fuzzer(llvm-bolt-fuzzer

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

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

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