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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207807 91177308-0d34-0410-b5e6-96231b3b80d8
510 lines
18 KiB
C++
510 lines
18 KiB
C++
//===---------------------------- StackMaps.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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#include "llvm/CodeGen/StackMaps.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOpcodes.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include <iterator>
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using namespace llvm;
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#define DEBUG_TYPE "stackmaps"
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static cl::opt<int> StackMapVersion("stackmap-version", cl::init(1),
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cl::desc("Specify the stackmap encoding version (default = 1)"));
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const char *StackMaps::WSMP = "Stack Maps: ";
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PatchPointOpers::PatchPointOpers(const MachineInstr *MI)
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: MI(MI),
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HasDef(MI->getOperand(0).isReg() && MI->getOperand(0).isDef() &&
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!MI->getOperand(0).isImplicit()),
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IsAnyReg(MI->getOperand(getMetaIdx(CCPos)).getImm() == CallingConv::AnyReg)
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{
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#ifndef NDEBUG
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unsigned CheckStartIdx = 0, e = MI->getNumOperands();
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while (CheckStartIdx < e && MI->getOperand(CheckStartIdx).isReg() &&
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MI->getOperand(CheckStartIdx).isDef() &&
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!MI->getOperand(CheckStartIdx).isImplicit())
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++CheckStartIdx;
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assert(getMetaIdx() == CheckStartIdx &&
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"Unexpected additional definition in Patchpoint intrinsic.");
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#endif
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}
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unsigned PatchPointOpers::getNextScratchIdx(unsigned StartIdx) const {
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if (!StartIdx)
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StartIdx = getVarIdx();
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// Find the next scratch register (implicit def and early clobber)
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unsigned ScratchIdx = StartIdx, e = MI->getNumOperands();
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while (ScratchIdx < e &&
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!(MI->getOperand(ScratchIdx).isReg() &&
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MI->getOperand(ScratchIdx).isDef() &&
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MI->getOperand(ScratchIdx).isImplicit() &&
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MI->getOperand(ScratchIdx).isEarlyClobber()))
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++ScratchIdx;
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assert(ScratchIdx != e && "No scratch register available");
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return ScratchIdx;
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}
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StackMaps::StackMaps(AsmPrinter &AP) : AP(AP) {
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if (StackMapVersion != 1)
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llvm_unreachable("Unsupported stackmap version!");
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}
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MachineInstr::const_mop_iterator
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StackMaps::parseOperand(MachineInstr::const_mop_iterator MOI,
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MachineInstr::const_mop_iterator MOE,
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LocationVec &Locs, LiveOutVec &LiveOuts) const {
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if (MOI->isImm()) {
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switch (MOI->getImm()) {
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default: llvm_unreachable("Unrecognized operand type.");
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case StackMaps::DirectMemRefOp: {
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unsigned Size = AP.TM.getDataLayout()->getPointerSizeInBits();
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assert((Size % 8) == 0 && "Need pointer size in bytes.");
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Size /= 8;
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unsigned Reg = (++MOI)->getReg();
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int64_t Imm = (++MOI)->getImm();
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Locs.push_back(Location(StackMaps::Location::Direct, Size, Reg, Imm));
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break;
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}
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case StackMaps::IndirectMemRefOp: {
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int64_t Size = (++MOI)->getImm();
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assert(Size > 0 && "Need a valid size for indirect memory locations.");
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unsigned Reg = (++MOI)->getReg();
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int64_t Imm = (++MOI)->getImm();
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Locs.push_back(Location(StackMaps::Location::Indirect, Size, Reg, Imm));
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break;
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}
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case StackMaps::ConstantOp: {
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++MOI;
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assert(MOI->isImm() && "Expected constant operand.");
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int64_t Imm = MOI->getImm();
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Locs.push_back(Location(Location::Constant, sizeof(int64_t), 0, Imm));
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break;
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}
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}
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return ++MOI;
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}
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// The physical register number will ultimately be encoded as a DWARF regno.
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// The stack map also records the size of a spill slot that can hold the
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// register content. (The runtime can track the actual size of the data type
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// if it needs to.)
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if (MOI->isReg()) {
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// Skip implicit registers (this includes our scratch registers)
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if (MOI->isImplicit())
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return ++MOI;
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assert(TargetRegisterInfo::isPhysicalRegister(MOI->getReg()) &&
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"Virtreg operands should have been rewritten before now.");
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const TargetRegisterClass *RC =
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AP.TM.getRegisterInfo()->getMinimalPhysRegClass(MOI->getReg());
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assert(!MOI->getSubReg() && "Physical subreg still around.");
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Locs.push_back(
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Location(Location::Register, RC->getSize(), MOI->getReg(), 0));
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return ++MOI;
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}
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if (MOI->isRegLiveOut())
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LiveOuts = parseRegisterLiveOutMask(MOI->getRegLiveOut());
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return ++MOI;
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}
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/// Go up the super-register chain until we hit a valid dwarf register number.
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static unsigned getDwarfRegNum(unsigned Reg, const TargetRegisterInfo *TRI) {
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int RegNo = TRI->getDwarfRegNum(Reg, false);
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for (MCSuperRegIterator SR(Reg, TRI); SR.isValid() && RegNo < 0; ++SR)
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RegNo = TRI->getDwarfRegNum(*SR, false);
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assert(RegNo >= 0 && "Invalid Dwarf register number.");
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return (unsigned) RegNo;
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}
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/// Create a live-out register record for the given register Reg.
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StackMaps::LiveOutReg
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StackMaps::createLiveOutReg(unsigned Reg, const TargetRegisterInfo *TRI) const {
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unsigned RegNo = getDwarfRegNum(Reg, TRI);
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unsigned Size = TRI->getMinimalPhysRegClass(Reg)->getSize();
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return LiveOutReg(Reg, RegNo, Size);
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}
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/// Parse the register live-out mask and return a vector of live-out registers
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/// that need to be recorded in the stackmap.
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StackMaps::LiveOutVec
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StackMaps::parseRegisterLiveOutMask(const uint32_t *Mask) const {
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assert(Mask && "No register mask specified");
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const TargetRegisterInfo *TRI = AP.TM.getRegisterInfo();
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LiveOutVec LiveOuts;
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// Create a LiveOutReg for each bit that is set in the register mask.
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for (unsigned Reg = 0, NumRegs = TRI->getNumRegs(); Reg != NumRegs; ++Reg)
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if ((Mask[Reg / 32] >> Reg % 32) & 1)
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LiveOuts.push_back(createLiveOutReg(Reg, TRI));
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// We don't need to keep track of a register if its super-register is already
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// in the list. Merge entries that refer to the same dwarf register and use
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// the maximum size that needs to be spilled.
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std::sort(LiveOuts.begin(), LiveOuts.end());
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for (LiveOutVec::iterator I = LiveOuts.begin(), E = LiveOuts.end();
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I != E; ++I) {
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for (LiveOutVec::iterator II = std::next(I); II != E; ++II) {
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if (I->RegNo != II->RegNo) {
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// Skip all the now invalid entries.
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I = --II;
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break;
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}
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I->Size = std::max(I->Size, II->Size);
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if (TRI->isSuperRegister(I->Reg, II->Reg))
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I->Reg = II->Reg;
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II->MarkInvalid();
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}
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}
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LiveOuts.erase(std::remove_if(LiveOuts.begin(), LiveOuts.end(),
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LiveOutReg::IsInvalid), LiveOuts.end());
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return LiveOuts;
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}
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void StackMaps::recordStackMapOpers(const MachineInstr &MI, uint64_t ID,
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MachineInstr::const_mop_iterator MOI,
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MachineInstr::const_mop_iterator MOE,
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bool recordResult) {
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MCContext &OutContext = AP.OutStreamer.getContext();
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MCSymbol *MILabel = OutContext.CreateTempSymbol();
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AP.OutStreamer.EmitLabel(MILabel);
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LocationVec Locations;
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LiveOutVec LiveOuts;
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if (recordResult) {
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assert(PatchPointOpers(&MI).hasDef() && "Stackmap has no return value.");
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parseOperand(MI.operands_begin(), std::next(MI.operands_begin()),
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Locations, LiveOuts);
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}
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// Parse operands.
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while (MOI != MOE) {
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MOI = parseOperand(MOI, MOE, Locations, LiveOuts);
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}
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// Move large constants into the constant pool.
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for (LocationVec::iterator I = Locations.begin(), E = Locations.end();
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I != E; ++I) {
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// Constants are encoded as sign-extended integers.
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// -1 is directly encoded as .long 0xFFFFFFFF with no constant pool.
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if (I->LocType == Location::Constant &&
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((I->Offset + (int64_t(1)<<31)) >> 32) != 0) {
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I->LocType = Location::ConstantIndex;
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auto Result = ConstPool.insert(std::make_pair(I->Offset, I->Offset));
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I->Offset = Result.first - ConstPool.begin();
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}
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}
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// Create an expression to calculate the offset of the callsite from function
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// entry.
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const MCExpr *CSOffsetExpr = MCBinaryExpr::CreateSub(
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MCSymbolRefExpr::Create(MILabel, OutContext),
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MCSymbolRefExpr::Create(AP.CurrentFnSym, OutContext),
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OutContext);
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CSInfos.push_back(CallsiteInfo(CSOffsetExpr, ID, Locations, LiveOuts));
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// Record the stack size of the current function.
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const MachineFrameInfo *MFI = AP.MF->getFrameInfo();
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FnStackSize[AP.CurrentFnSym] =
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MFI->hasVarSizedObjects() ? UINT64_MAX : MFI->getStackSize();
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}
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void StackMaps::recordStackMap(const MachineInstr &MI) {
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assert(MI.getOpcode() == TargetOpcode::STACKMAP && "expected stackmap");
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int64_t ID = MI.getOperand(0).getImm();
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recordStackMapOpers(MI, ID, std::next(MI.operands_begin(), 2),
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MI.operands_end());
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}
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void StackMaps::recordPatchPoint(const MachineInstr &MI) {
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assert(MI.getOpcode() == TargetOpcode::PATCHPOINT && "expected patchpoint");
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PatchPointOpers opers(&MI);
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int64_t ID = opers.getMetaOper(PatchPointOpers::IDPos).getImm();
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MachineInstr::const_mop_iterator MOI =
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std::next(MI.operands_begin(), opers.getStackMapStartIdx());
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recordStackMapOpers(MI, ID, MOI, MI.operands_end(),
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opers.isAnyReg() && opers.hasDef());
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#ifndef NDEBUG
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// verify anyregcc
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LocationVec &Locations = CSInfos.back().Locations;
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if (opers.isAnyReg()) {
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unsigned NArgs = opers.getMetaOper(PatchPointOpers::NArgPos).getImm();
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for (unsigned i = 0, e = (opers.hasDef() ? NArgs+1 : NArgs); i != e; ++i)
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assert(Locations[i].LocType == Location::Register &&
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"anyreg arg must be in reg.");
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}
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#endif
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}
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/// Emit the stackmap header.
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///
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/// Header {
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/// uint8 : Stack Map Version (currently 1)
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/// uint8 : Reserved (expected to be 0)
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/// uint16 : Reserved (expected to be 0)
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/// }
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/// uint32 : NumFunctions
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/// uint32 : NumConstants
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/// uint32 : NumRecords
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void StackMaps::emitStackmapHeader(MCStreamer &OS) {
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// Header.
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OS.EmitIntValue(StackMapVersion, 1); // Version.
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OS.EmitIntValue(0, 1); // Reserved.
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OS.EmitIntValue(0, 2); // Reserved.
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// Num functions.
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DEBUG(dbgs() << WSMP << "#functions = " << FnStackSize.size() << '\n');
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OS.EmitIntValue(FnStackSize.size(), 4);
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// Num constants.
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DEBUG(dbgs() << WSMP << "#constants = " << ConstPool.size() << '\n');
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OS.EmitIntValue(ConstPool.size(), 4);
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// Num callsites.
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DEBUG(dbgs() << WSMP << "#callsites = " << CSInfos.size() << '\n');
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OS.EmitIntValue(CSInfos.size(), 4);
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}
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/// Emit the function frame record for each function.
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///
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/// StkSizeRecord[NumFunctions] {
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/// uint64 : Function Address
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/// uint64 : Stack Size
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/// }
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void StackMaps::emitFunctionFrameRecords(MCStreamer &OS) {
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// Function Frame records.
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DEBUG(dbgs() << WSMP << "functions:\n");
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for (auto const &FR : FnStackSize) {
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DEBUG(dbgs() << WSMP << "function addr: " << FR.first
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<< " frame size: " << FR.second);
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OS.EmitSymbolValue(FR.first, 8);
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OS.EmitIntValue(FR.second, 8);
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}
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}
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/// Emit the constant pool.
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///
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/// int64 : Constants[NumConstants]
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void StackMaps::emitConstantPoolEntries(MCStreamer &OS) {
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// Constant pool entries.
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DEBUG(dbgs() << WSMP << "constants:\n");
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for (auto ConstEntry : ConstPool) {
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DEBUG(dbgs() << WSMP << ConstEntry.second << '\n');
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OS.EmitIntValue(ConstEntry.second, 8);
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}
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}
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/// Emit the callsite info for each callsite.
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///
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/// StkMapRecord[NumRecords] {
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/// uint64 : PatchPoint ID
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/// uint32 : Instruction Offset
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/// uint16 : Reserved (record flags)
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/// uint16 : NumLocations
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/// Location[NumLocations] {
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/// uint8 : Register | Direct | Indirect | Constant | ConstantIndex
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/// uint8 : Size in Bytes
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/// uint16 : Dwarf RegNum
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/// int32 : Offset
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/// }
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/// uint16 : Padding
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/// uint16 : NumLiveOuts
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/// LiveOuts[NumLiveOuts] {
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/// uint16 : Dwarf RegNum
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/// uint8 : Reserved
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/// uint8 : Size in Bytes
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/// }
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/// uint32 : Padding (only if required to align to 8 byte)
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/// }
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///
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/// Location Encoding, Type, Value:
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/// 0x1, Register, Reg (value in register)
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/// 0x2, Direct, Reg + Offset (frame index)
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/// 0x3, Indirect, [Reg + Offset] (spilled value)
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/// 0x4, Constant, Offset (small constant)
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/// 0x5, ConstIndex, Constants[Offset] (large constant)
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void StackMaps::emitCallsiteEntries(MCStreamer &OS,
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const TargetRegisterInfo *TRI) {
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// Callsite entries.
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DEBUG(dbgs() << WSMP << "callsites:\n");
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for (const auto &CSI : CSInfos) {
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const LocationVec &CSLocs = CSI.Locations;
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const LiveOutVec &LiveOuts = CSI.LiveOuts;
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DEBUG(dbgs() << WSMP << "callsite " << CSI.ID << "\n");
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// Verify stack map entry. It's better to communicate a problem to the
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// runtime than crash in case of in-process compilation. Currently, we do
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// simple overflow checks, but we may eventually communicate other
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// compilation errors this way.
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if (CSLocs.size() > UINT16_MAX || LiveOuts.size() > UINT16_MAX) {
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OS.EmitIntValue(UINT64_MAX, 8); // Invalid ID.
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OS.EmitValue(CSI.CSOffsetExpr, 4);
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OS.EmitIntValue(0, 2); // Reserved.
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OS.EmitIntValue(0, 2); // 0 locations.
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OS.EmitIntValue(0, 2); // padding.
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OS.EmitIntValue(0, 2); // 0 live-out registers.
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OS.EmitIntValue(0, 4); // padding.
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continue;
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}
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OS.EmitIntValue(CSI.ID, 8);
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OS.EmitValue(CSI.CSOffsetExpr, 4);
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// Reserved for flags.
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OS.EmitIntValue(0, 2);
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DEBUG(dbgs() << WSMP << " has " << CSLocs.size() << " locations\n");
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OS.EmitIntValue(CSLocs.size(), 2);
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unsigned OperIdx = 0;
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for (const auto &Loc : CSLocs) {
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unsigned RegNo = 0;
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int Offset = Loc.Offset;
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if(Loc.Reg) {
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RegNo = getDwarfRegNum(Loc.Reg, TRI);
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// If this is a register location, put the subregister byte offset in
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// the location offset.
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if (Loc.LocType == Location::Register) {
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assert(!Loc.Offset && "Register location should have zero offset");
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unsigned LLVMRegNo = TRI->getLLVMRegNum(RegNo, false);
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unsigned SubRegIdx = TRI->getSubRegIndex(LLVMRegNo, Loc.Reg);
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if (SubRegIdx)
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Offset = TRI->getSubRegIdxOffset(SubRegIdx);
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}
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}
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else {
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assert(Loc.LocType != Location::Register &&
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"Missing location register");
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}
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DEBUG(dbgs() << WSMP << " Loc " << OperIdx << ": ";
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switch (Loc.LocType) {
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case Location::Unprocessed:
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dbgs() << "<Unprocessed operand>";
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break;
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case Location::Register:
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dbgs() << "Register " << TRI->getName(Loc.Reg);
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break;
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case Location::Direct:
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dbgs() << "Direct " << TRI->getName(Loc.Reg);
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if (Loc.Offset)
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dbgs() << " + " << Loc.Offset;
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break;
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case Location::Indirect:
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dbgs() << "Indirect " << TRI->getName(Loc.Reg)
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<< " + " << Loc.Offset;
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break;
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case Location::Constant:
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dbgs() << "Constant " << Loc.Offset;
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break;
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case Location::ConstantIndex:
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dbgs() << "Constant Index " << Loc.Offset;
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break;
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}
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dbgs() << " [encoding: .byte " << Loc.LocType
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<< ", .byte " << Loc.Size
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<< ", .short " << RegNo
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<< ", .int " << Offset << "]\n";
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);
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OS.EmitIntValue(Loc.LocType, 1);
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OS.EmitIntValue(Loc.Size, 1);
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OS.EmitIntValue(RegNo, 2);
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OS.EmitIntValue(Offset, 4);
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OperIdx++;
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}
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DEBUG(dbgs() << WSMP << " has " << LiveOuts.size()
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<< " live-out registers\n");
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// Num live-out registers and padding to align to 4 byte.
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OS.EmitIntValue(0, 2);
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OS.EmitIntValue(LiveOuts.size(), 2);
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OperIdx = 0;
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for (const auto &LO : LiveOuts) {
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DEBUG(dbgs() << WSMP << " LO " << OperIdx << ": "
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<< TRI->getName(LO.Reg)
|
|
<< " [encoding: .short " << LO.RegNo
|
|
<< ", .byte 0, .byte " << LO.Size << "]\n");
|
|
OS.EmitIntValue(LO.RegNo, 2);
|
|
OS.EmitIntValue(0, 1);
|
|
OS.EmitIntValue(LO.Size, 1);
|
|
}
|
|
// Emit alignment to 8 byte.
|
|
OS.EmitValueToAlignment(8);
|
|
}
|
|
}
|
|
|
|
/// Serialize the stackmap data.
|
|
void StackMaps::serializeToStackMapSection() {
|
|
(void) WSMP;
|
|
// Bail out if there's no stack map data.
|
|
assert((!CSInfos.empty() || (CSInfos.empty() && ConstPool.empty())) &&
|
|
"Expected empty constant pool too!");
|
|
assert((!CSInfos.empty() || (CSInfos.empty() && FnStackSize.empty())) &&
|
|
"Expected empty function record too!");
|
|
if (CSInfos.empty())
|
|
return;
|
|
|
|
MCContext &OutContext = AP.OutStreamer.getContext();
|
|
MCStreamer &OS = AP.OutStreamer;
|
|
const TargetRegisterInfo *TRI = AP.TM.getRegisterInfo();
|
|
|
|
// Create the section.
|
|
const MCSection *StackMapSection =
|
|
OutContext.getObjectFileInfo()->getStackMapSection();
|
|
OS.SwitchSection(StackMapSection);
|
|
|
|
// Emit a dummy symbol to force section inclusion.
|
|
OS.EmitLabel(OutContext.GetOrCreateSymbol(Twine("__LLVM_StackMaps")));
|
|
|
|
// Serialize data.
|
|
DEBUG(dbgs() << "********** Stack Map Output **********\n");
|
|
emitStackmapHeader(OS);
|
|
emitFunctionFrameRecords(OS);
|
|
emitConstantPoolEntries(OS);
|
|
emitCallsiteEntries(OS, TRI);
|
|
OS.AddBlankLine();
|
|
|
|
// Clean up.
|
|
CSInfos.clear();
|
|
ConstPool.clear();
|
|
}
|