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[BOLT] Only link and initialize supported targets (#127509)

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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
14 changed files with 96 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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

@@ -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
View File

@@ -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
View File

@@ -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
View File

@@ -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
View File

@@ -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
View File

@@ -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
View File

@@ -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
View File

@@ -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;
}