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//===--- bolt/Passes/Hugify.cpp -------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "bolt/Passes/Hugify.h"
#define DEBUG_TYPE "bolt-hugify"
using namespace llvm;
namespace llvm {
namespace bolt {
Error HugePage::runOnFunctions(BinaryContext &BC) {
auto *RtLibrary = BC.getRuntimeLibrary();
if (!RtLibrary || !BC.isELF() || !BC.StartFunctionAddress) {
return Error::success();
}
auto createSimpleFunction =
[&](std::string Title, std::vector<MCInst> Instrs) -> BinaryFunction * {
BinaryFunction *Func = BC.createInjectedBinaryFunction(Title);
std::vector<std::unique_ptr<BinaryBasicBlock>> BBs;
BBs.emplace_back(Func->createBasicBlock(nullptr));
BBs.back()->addInstructions(Instrs.begin(), Instrs.end());
BBs.back()->setCFIState(0);
BBs.back()->setOffset(BinaryBasicBlock::INVALID_OFFSET);
Func->insertBasicBlocks(nullptr, std::move(BBs),
/*UpdateLayout=*/true,
/*UpdateCFIState=*/false);
Func->updateState(BinaryFunction::State::CFG_Finalized);
return Func;
};
const BinaryFunction *const Start =
BC.getBinaryFunctionAtAddress(*BC.StartFunctionAddress);
assert(Start && "Entry point function not found");
const MCSymbol *StartSym = Start->getSymbol();
createSimpleFunction("__bolt_hugify_start_program",
BC.MIB->createSymbolTrampoline(StartSym, BC.Ctx.get()));
return Error::success();
}
} // namespace bolt
} // namespace llvm
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