mirror of
https://github.com/intel/llvm.git
synced 2026-01-20 19:07:53 +08:00
48ae32a33b
Summary: Refactor architecture-specific code out of llvm into llvm-bolt. Introduce MCPlusBuilder, a class that is taking over MCInstrAnalysis responsibilities, i.e. creating, analyzing, and modifying instructions. To access the builder use BC->MIB, i.e. substitute MIA with MIB. MIB is an acronym for MCInstBuilder, that's what MCPlusBuilder used to be. The name stuck, and I find it better than MPB. Instructions are still MCInst, and a bunch of BOLT-specific code still lives in LLVM, but the staff under Target/* is significantly reduced. (cherry picked from FBD7300101)
505 lines
17 KiB
C++
505 lines
17 KiB
C++
//===--- Passes/LongJmp.cpp -----------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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//===----------------------------------------------------------------------===//
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#include "LongJmp.h"
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#define DEBUG_TYPE "longjmp"
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using namespace llvm;
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namespace opts {
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extern cl::opt<bool> UseOldText;
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extern cl::opt<unsigned> AlignFunctions;
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extern cl::opt<unsigned> AlignFunctionsMaxBytes;
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}
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namespace llvm {
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namespace bolt {
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namespace {
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constexpr unsigned ColdFragAlign = 16;
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constexpr unsigned PageAlign = 0x200000;
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std::pair<std::unique_ptr<BinaryBasicBlock>, MCSymbol *>
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createNewStub(const BinaryContext &BC, BinaryFunction &Func,
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const MCSymbol *TgtSym) {
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auto *StubSym = BC.Ctx->createTempSymbol("Stub", true);
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auto StubBB = Func.createBasicBlock(0, StubSym);
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std::vector<MCInst> Seq;
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BC.MIB->createLongJmp(Seq, TgtSym, BC.Ctx.get());
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StubBB->addInstructions(Seq.begin(), Seq.end());
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StubBB->setExecutionCount(0);
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return std::make_pair(std::move(StubBB), StubSym);
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}
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void shrinkStubToShortJmp(const BinaryContext &BC, BinaryBasicBlock &StubBB,
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const MCSymbol *Tgt) {
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std::vector<MCInst> Seq;
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BC.MIB->createShortJmp(Seq, Tgt, BC.Ctx.get());
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StubBB.clear();
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StubBB.addInstructions(Seq.begin(), Seq.end());
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}
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void shrinkStubToSingleInst(const BinaryContext &BC, BinaryBasicBlock &StubBB,
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const MCSymbol *Tgt, bool TgtIsFunc) {
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MCInst Inst;
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BC.MIB->createUncondBranch(Inst, Tgt, BC.Ctx.get());
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if (TgtIsFunc)
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BC.MIB->convertJmpToTailCall(Inst, BC.Ctx.get());
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StubBB.clear();
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StubBB.addInstruction(Inst);
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}
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BinaryBasicBlock *getBBAtHotColdSplitPoint(BinaryFunction &Func) {
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if (!Func.isSplit() || Func.empty())
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return nullptr;
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assert(!(*Func.begin()).isCold() && "Entry cannot be cold");
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for (auto I = Func.layout_begin(), E = Func.layout_end(); I != E; ++I) {
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auto Next = std::next(I);
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if (Next != E && (*Next)->isCold())
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return *I;
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}
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llvm_unreachable("No hot-colt split point found");
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}
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}
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std::unique_ptr<BinaryBasicBlock>
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LongJmpPass::replaceTargetWithStub(const BinaryContext &BC,
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BinaryFunction &Func, BinaryBasicBlock &BB,
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MCInst &Inst) {
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std::unique_ptr<BinaryBasicBlock> NewBB;
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auto TgtSym = BC.MIB->getTargetSymbol(Inst);
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assert (TgtSym && "getTargetSymbol failed");
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BinaryBasicBlock::BinaryBranchInfo BI{0, 0};
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auto *TgtBB = BB.getSuccessor(TgtSym, BI);
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// Do not issue a long jmp for blocks in the same region, except if
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// the region is too large to fit in this branch
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if (TgtBB && TgtBB->isCold() == BB.isCold()) {
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// Suppose we have half the available space to account for increase in the
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// function size due to extra blocks being inserted (conservative estimate)
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auto BitsAvail = BC.MIB->getPCRelEncodingSize(Inst) - 2;
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uint64_t Mask = ~((1ULL << BitsAvail) - 1);
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if (!(Func.getMaxSize() & Mask))
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return nullptr;
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// This is a special case for fixBranches, which is usually free to swap
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// targets when a block has two successors. The other successor may not
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// fit in this instruction as well.
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BC.MIB->addAnnotation(BC.Ctx.get(), Inst, "DoNotChangeTarget", true);
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}
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BinaryBasicBlock *StubBB =
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BB.isCold() ? ColdStubs[&Func][TgtSym] : HotStubs[&Func][TgtSym];
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MCSymbol *StubSymbol = StubBB ? StubBB->getLabel() : nullptr;
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if (!StubBB) {
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std::tie(NewBB, StubSymbol) = createNewStub(BC, Func, TgtSym);
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StubBB = NewBB.get();
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Stubs[&Func].insert(StubBB);
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}
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// Local branch
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if (TgtBB) {
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uint64_t OrigCount{BI.Count};
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uint64_t OrigMispreds{BI.MispredictedCount};
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BB.replaceSuccessor(TgtBB, StubBB, OrigCount, OrigMispreds);
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StubBB->setExecutionCount(StubBB->getExecutionCount() + OrigCount);
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if (NewBB) {
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StubBB->addSuccessor(TgtBB, OrigCount, OrigMispreds);
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StubBB->setIsCold(BB.isCold());
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}
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// Call / tail call
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} else {
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StubBB->setExecutionCount(StubBB->getExecutionCount() +
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BB.getExecutionCount());
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if (NewBB) {
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assert(TgtBB == nullptr);
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StubBB->setIsCold(BB.isCold());
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// Set as entry point because this block is valid but we have no preds
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StubBB->setEntryPoint(true);
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}
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}
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BC.MIB->replaceBranchTarget(Inst, StubSymbol, BC.Ctx.get());
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++StubRefCount[StubBB];
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StubBits[StubBB] = BC.AsmInfo->getCodePointerSize() * 8;
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if (NewBB) {
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if (BB.isCold())
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ColdStubs[&Func][TgtSym] = StubBB;
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else
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HotStubs[&Func][TgtSym] = StubBB;
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}
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return NewBB;
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}
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namespace {
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bool shouldInsertStub(const BinaryContext &BC, const MCInst &Inst) {
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return (BC.MIB->isBranch(Inst) || BC.MIB->isCall(Inst)) &&
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!BC.MIB->isIndirectBranch(Inst) && !BC.MIB->isIndirectCall(Inst);
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}
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}
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void LongJmpPass::insertStubs(const BinaryContext &BC, BinaryFunction &Func) {
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std::vector<std::pair<BinaryBasicBlock *, std::unique_ptr<BinaryBasicBlock>>>
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Insertions;
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BinaryBasicBlock *Frontier = getBBAtHotColdSplitPoint(Func);
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for (auto &BB : Func) {
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for (auto &Inst : BB) {
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// Only analyze direct branches with target distance constraints
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if (!shouldInsertStub(BC, Inst))
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continue;
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// Insert stubs close to the patched BB if call, but far away from the
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// hot path if a branch, since this branch target is the cold region.
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BinaryBasicBlock *InsertionPoint = &BB;
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if (!BC.MIB->isCall(Inst) && Frontier && !BB.isCold()) {
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auto BitsAvail = BC.MIB->getPCRelEncodingSize(Inst) - 2;
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uint64_t Mask = ~((1ULL << BitsAvail) - 1);
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if (!(Func.getMaxSize() & Mask))
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InsertionPoint = Frontier;
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}
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// Always put stubs at the end of the function if non-simple. We can't
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// change the layout of non-simple functions because it has jump tables
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// that we do not control.
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if (!Func.isSimple())
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InsertionPoint = &*std::prev(Func.end());
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// Create a stub to handle a far-away target
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Insertions.emplace_back(std::make_pair(
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InsertionPoint, replaceTargetWithStub(BC, Func, BB, Inst)));
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}
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}
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for (auto &Elmt : Insertions) {
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if (!Elmt.second)
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continue;
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std::vector<std::unique_ptr<BinaryBasicBlock>> NewBBs;
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NewBBs.emplace_back(std::move(Elmt.second));
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Func.insertBasicBlocks(Elmt.first, std::move(NewBBs), true, true);
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}
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}
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void LongJmpPass::tentativeBBLayout(const BinaryContext &BC,
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const BinaryFunction &Func) {
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uint64_t HotDot = HotAddresses[&Func];
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uint64_t ColdDot = ColdAddresses[&Func];
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bool Cold{false};
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for (auto *BB : Func.layout()) {
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if (Cold || BB->isCold()) {
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Cold = true;
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BBAddresses[BB] = ColdDot;
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ColdDot += BC.computeCodeSize(BB->begin(), BB->end());
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} else {
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BBAddresses[BB] = HotDot;
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HotDot += BC.computeCodeSize(BB->begin(), BB->end());
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}
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}
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}
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uint64_t LongJmpPass::tentativeLayoutRelocColdPart(
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const BinaryContext &BC, std::vector<BinaryFunction *> &SortedFunctions,
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uint64_t DotAddress) {
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for (auto Func : SortedFunctions) {
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if (!Func->isSplit())
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continue;
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DotAddress = alignTo(DotAddress, BinaryFunction::MinAlign);
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auto Pad = OffsetToAlignment(DotAddress, opts::AlignFunctions);
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if (Pad <= opts::AlignFunctionsMaxBytes)
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DotAddress += Pad;
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ColdAddresses[Func] = DotAddress;
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DEBUG(dbgs() << Func->getPrintName() << " cold tentative: "
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<< Twine::utohexstr(DotAddress) << "\n");
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DotAddress += Func->estimateColdSize();
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DotAddress += Func->estimateConstantIslandSize();
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}
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return DotAddress;
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}
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uint64_t LongJmpPass::tentativeLayoutRelocMode(
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const BinaryContext &BC, std::vector<BinaryFunction *> &SortedFunctions,
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uint64_t DotAddress) {
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// Compute hot cold frontier
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uint32_t LastHotIndex = -1u;
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uint32_t CurrentIndex = 0;
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for (auto *BF : SortedFunctions) {
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if (!BF->hasValidIndex() && LastHotIndex == -1u) {
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LastHotIndex = CurrentIndex;
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}
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++CurrentIndex;
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}
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// Hot
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CurrentIndex = 0;
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bool ColdLayoutDone = false;
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for (auto Func : SortedFunctions) {
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if (!ColdLayoutDone && CurrentIndex >= LastHotIndex){
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DotAddress =
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tentativeLayoutRelocColdPart(BC, SortedFunctions, DotAddress);
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ColdLayoutDone = true;
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}
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DotAddress = alignTo(DotAddress, BinaryFunction::MinAlign);
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auto Pad = OffsetToAlignment(DotAddress, opts::AlignFunctions);
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if (Pad <= opts::AlignFunctionsMaxBytes)
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DotAddress += Pad;
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HotAddresses[Func] = DotAddress;
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DEBUG(dbgs() << Func->getPrintName()
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<< " tentative: " << Twine::utohexstr(DotAddress) << "\n");
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if (!Func->isSplit())
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DotAddress += Func->estimateSize();
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else
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DotAddress += Func->estimateHotSize();
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DotAddress += Func->estimateConstantIslandSize();
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++CurrentIndex;
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}
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// BBs
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for (auto Func : SortedFunctions)
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tentativeBBLayout(BC, *Func);
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return DotAddress;
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}
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void LongJmpPass::tentativeLayout(
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const BinaryContext &BC,
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std::vector<BinaryFunction *> &SortedFunctions) {
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uint64_t DotAddress = BC.LayoutStartAddress;
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if (!BC.HasRelocations) {
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for (auto Func : SortedFunctions) {
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HotAddresses[Func] = Func->getAddress();
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DotAddress = alignTo(DotAddress, ColdFragAlign);
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ColdAddresses[Func] = DotAddress;
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if (Func->isSplit())
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DotAddress += Func->estimateColdSize();
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tentativeBBLayout(BC, *Func);
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}
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return;
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}
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// Relocation mode
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auto EstimatedTextSize = tentativeLayoutRelocMode(BC, SortedFunctions, 0);
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// Initial padding
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if (opts::UseOldText && EstimatedTextSize <= BC.OldTextSectionSize) {
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DotAddress = BC.OldTextSectionAddress;
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auto Pad = OffsetToAlignment(DotAddress, PageAlign);
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if (Pad + EstimatedTextSize <= BC.OldTextSectionSize) {
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DotAddress += Pad;
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}
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} else {
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DotAddress = alignTo(BC.LayoutStartAddress, PageAlign);
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}
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tentativeLayoutRelocMode(BC, SortedFunctions, DotAddress);
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}
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void LongJmpPass::removeStubRef(const BinaryContext &BC,
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BinaryBasicBlock *BB, MCInst &Inst,
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BinaryBasicBlock *StubBB,
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const MCSymbol *Target,
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BinaryBasicBlock *TgtBB) {
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BC.MIB->replaceBranchTarget(Inst, Target, BC.Ctx.get());
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--StubRefCount[StubBB];
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assert(StubRefCount[StubBB] >= 0 && "Ref count is lost");
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if (TgtBB && BB->isSuccessor(StubBB)) {
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const auto &BI = BB->getBranchInfo(*StubBB);
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uint64_t OrigCount{BI.Count};
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uint64_t OrigMispreds{BI.MispredictedCount};
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BB->replaceSuccessor(StubBB, TgtBB, OrigCount, OrigMispreds);
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}
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if (StubRefCount[StubBB] == 0) {
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// Remove the block from CFG
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StubBB->removeSuccessors(StubBB->succ_begin(), StubBB->succ_end());
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StubBB->markValid(false);
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StubBB->setEntryPoint(false);
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}
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}
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bool LongJmpPass::usesStub(const BinaryContext &BC, const BinaryFunction &Func,
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const MCInst &Inst) const {
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auto TgtSym = BC.MIB->getTargetSymbol(Inst);
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auto *TgtBB = Func.getBasicBlockForLabel(TgtSym);
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auto Iter = Stubs.find(&Func);
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if (Iter != Stubs.end())
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return Iter->second.count(TgtBB);
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return false;
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}
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uint64_t LongJmpPass::getSymbolAddress(const BinaryContext &BC,
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const MCSymbol *Target,
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const BinaryBasicBlock *TgtBB) const {
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if (TgtBB) {
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auto Iter = BBAddresses.find(TgtBB);
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assert (Iter != BBAddresses.end() && "Unrecognized local BB");
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return Iter->second;
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}
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auto *TargetFunc = BC.getFunctionForSymbol(Target);
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auto Iter = HotAddresses.find(TargetFunc);
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if (Iter == HotAddresses.end()) {
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// Look at BinaryContext's resolution for this symbol - this is a symbol not
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// mapped to a BinaryFunction
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auto *BD = BC.getBinaryDataByName(Target->getName());
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assert(BD && "Unrecognized symbol");
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return BD ? BD->getAddress() : 0;
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}
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return Iter->second;
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}
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bool LongJmpPass::removeOrShrinkStubs(const BinaryContext &BC,
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BinaryFunction &Func) {
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bool Modified{false};
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assert(BC.TheTriple->getArch() == llvm::Triple::aarch64 &&
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"Unsupported arch");
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constexpr auto InsnSize = 4; // AArch64
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// Remove unnecessary stubs for branch targets we know we can fit in the
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// instruction
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for (auto &BB : Func) {
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uint64_t DotAddress = BBAddresses[&BB];
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for (auto &Inst : BB) {
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if (!shouldInsertStub(BC, Inst) || !usesStub(BC, Func, Inst)) {
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DotAddress += InsnSize;
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continue;
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}
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// Compute DoNotChangeTarget annotation, when fixBranches cannot swap
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// targets
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if (BC.MIB->isConditionalBranch(Inst) && BB.succ_size() == 2) {
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auto *SuccBB = BB.getConditionalSuccessor(false);
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bool IsStub = false;
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auto Iter = Stubs.find(&Func);
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if (Iter != Stubs.end())
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IsStub = Iter->second.count(SuccBB);
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auto *RealTargetSym =
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IsStub ? BC.MIB->getTargetSymbol(*SuccBB->begin()) : nullptr;
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if (IsStub)
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SuccBB = Func.getBasicBlockForLabel(RealTargetSym);
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uint64_t Offset = getSymbolAddress(BC, RealTargetSym, SuccBB);
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auto BitsAvail = BC.MIB->getPCRelEncodingSize(Inst) - 1;
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uint64_t Mask = ~((1ULL << BitsAvail) - 1);
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if ((Offset & Mask) &&
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!BC.MIB->hasAnnotation(Inst, "DoNotChangeTarget")) {
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BC.MIB->addAnnotation(BC.Ctx.get(), Inst, "DoNotChangeTarget", true);
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} else if ((!(Offset & Mask)) &&
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BC.MIB->hasAnnotation(Inst, "DoNotChangeTarget")) {
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BC.MIB->removeAnnotation(Inst, "DoNotChangeTarget");
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}
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}
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auto StubSym = BC.MIB->getTargetSymbol(Inst);
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auto *StubBB = Func.getBasicBlockForLabel(StubSym);
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auto *RealTargetSym = BC.MIB->getTargetSymbol(*StubBB->begin());
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auto *TgtBB = Func.getBasicBlockForLabel(RealTargetSym);
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auto BitsAvail = BC.MIB->getPCRelEncodingSize(Inst) - 1;
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uint64_t Mask = ~((1ULL << BitsAvail) - 1);
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uint64_t Offset = getSymbolAddress(BC, RealTargetSym, TgtBB);
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if (DotAddress > Offset)
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Offset = DotAddress - Offset;
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else
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Offset -= DotAddress;
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// If it fits in the original instr, remove the stub
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if (!(Offset & Mask)) {
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removeStubRef(BC, &BB, Inst, StubBB, RealTargetSym, TgtBB);
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Modified = true;
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}
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DotAddress += InsnSize;
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}
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}
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auto RangeShortJmp = BC.MIB->getShortJmpEncodingSize();
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auto RangeSingleInstr = BC.MIB->getUncondBranchEncodingSize();
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uint64_t ShortJmpMask = ~((1ULL << RangeShortJmp) - 1);
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uint64_t SingleInstrMask = ~((1ULL << (RangeSingleInstr - 1)) - 1);
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// Shrink stubs from 64 to 32 or 28 bit whenever possible
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for (auto &BB : Func) {
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if (!Stubs[&Func].count(&BB) || !BB.isValid())
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continue;
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auto Bits = StubBits[&BB];
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// Already working with the tightest range?
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if (Bits == RangeSingleInstr)
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continue;
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// Attempt to tight to short jmp
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auto *RealTargetSym = BC.MIB->getTargetSymbol(*BB.begin());
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auto *TgtBB = Func.getBasicBlockForLabel(RealTargetSym);
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uint64_t DotAddress = BBAddresses[&BB];
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uint64_t TgtAddress = getSymbolAddress(BC, RealTargetSym, TgtBB);
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if (TgtAddress & ShortJmpMask)
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continue;
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// Attempt to tight to pc-relative single-instr branch
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uint64_t PCRelTgtAddress = TgtAddress > DotAddress
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? TgtAddress - DotAddress
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: DotAddress - TgtAddress;
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if (PCRelTgtAddress & SingleInstrMask) {
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if (Bits > RangeShortJmp) {
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shrinkStubToShortJmp(BC, BB, RealTargetSym);
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StubBits[&BB] = RangeShortJmp;
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Modified = true;
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}
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continue;
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}
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if (Bits > RangeSingleInstr) {
|
|
shrinkStubToSingleInst(BC, BB, RealTargetSym, /*is func?*/!TgtBB);
|
|
StubBits[&BB] = RangeSingleInstr;
|
|
Modified = true;
|
|
}
|
|
}
|
|
return Modified;
|
|
}
|
|
|
|
void LongJmpPass::runOnFunctions(BinaryContext &BC,
|
|
std::map<uint64_t, BinaryFunction> &BFs,
|
|
std::set<uint64_t> &LargeFunctions) {
|
|
auto Sorted = BinaryContext::getSortedFunctions(BFs);
|
|
for (auto Func : Sorted) {
|
|
// We are going to remove invalid BBs, so remove any previous marks
|
|
for (auto &BB : *Func) {
|
|
BB.markValid(true);
|
|
}
|
|
insertStubs(BC, *Func);
|
|
// Don't ruin non-simple functions, they can't afford to have the layout
|
|
// changed.
|
|
if (Func->isSimple())
|
|
Func->fixBranches();
|
|
}
|
|
|
|
bool Modified;
|
|
do {
|
|
Modified = false;
|
|
tentativeLayout(BC, Sorted);
|
|
for (auto Func : Sorted) {
|
|
if (removeOrShrinkStubs(BC, *Func)) {
|
|
Func->eraseInvalidBBs();
|
|
if (Func->isSimple())
|
|
Func->fixBranches();
|
|
Modified = true;
|
|
}
|
|
}
|
|
} while (Modified);
|
|
}
|
|
|
|
}
|
|
}
|