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//===- bolt/RuntimeLibs/HugifyRuntimeLibrary.cpp - Hugify RT Library ------===//
//
// 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 implements the HugifyRuntimeLibrary class.
//
//===----------------------------------------------------------------------===//
#include "bolt/RuntimeLibs/HugifyRuntimeLibrary.h"
#include "bolt/Core/BinaryFunction.h"
#include "bolt/Core/Linker.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
using namespace bolt;
namespace opts {
extern cl::OptionCategory BoltOptCategory;
extern cl::opt<bool> HotText;
cl::opt<bool>
Hugify("hugify",
cl::desc("Automatically put hot code on 2MB page(s) (hugify) at "
"runtime. No manual call to hugify is needed in the binary "
"(which is what --hot-text relies on)."),
cl::cat(BoltOptCategory));
static cl::opt<std::string> RuntimeHugifyLib(
"runtime-hugify-lib",
cl::desc("specify file name of the runtime hugify library"),
cl::init("libbolt_rt_hugify.a"), cl::cat(BoltOptCategory));
} // namespace opts
void HugifyRuntimeLibrary::adjustCommandLineOptions(
const BinaryContext &BC) const {
if (opts::HotText) {
errs()
<< "BOLT-ERROR: -hot-text should be applied to binaries with "
"pre-compiled manual hugify support, while -hugify will add hugify "
"support automatically. These two options cannot both be present.\n";
exit(1);
}
// After the check, we set HotText to be true because automated hugify support
// relies on it.
opts::HotText = true;
if (!BC.StartFunctionAddress) {
errs() << "BOLT-ERROR: hugify runtime libraries require a known entry "
"point of "
"the input binary\n";
exit(1);
}
}
void HugifyRuntimeLibrary::link(BinaryContext &BC, StringRef ToolPath,
BOLTLinker &Linker,
BOLTLinker::SectionsMapper MapSections) {
std::string LibPath = getLibPath(ToolPath, opts::RuntimeHugifyLib);
loadLibrary(LibPath, Linker, MapSections);
assert(!RuntimeStartAddress &&
"We don't currently support linking multiple runtime libraries");
RuntimeStartAddress = Linker.lookupSymbol("__bolt_hugify_self").value_or(0);
if (!RuntimeStartAddress) {
errs() << "BOLT-ERROR: instrumentation library does not define "
"__bolt_hugify_self: "
<< LibPath << "\n";
exit(1);
}
}
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