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About pristine regsiters: Pristine registers "hold a value that is useless to the current function, but that must be preserved - they are callee saved registers that have not been saved." This concept saves compile time as it frees the prologue/epilogue inserter from adding every such register to every basic blocks live-in list. However the current code in getPristineRegs is formulated in a complicated way: Inside the function prologue and epilogue all callee saves are considered pristine, while in the rest of the code only the non-saved ones are considered pristine. This requires logic to differentiate between prologue/epilogue and the rest and in the presence of shrink-wrapping this even becomes complicated/expensive. It's also unnecessary because the prologue epilogue inserters already mark callee-save registers that are saved/restores properly in the respective blocks in the prologue/epilogue (see updateLiveness() in PrologueEpilogueInserter.cpp). So only declaring non-saved/restored callee saved registers as pristine just works. Differential Revision: http://reviews.llvm.org/D10101 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238524 91177308-0d34-0410-b5e6-96231b3b80d8
965 lines
34 KiB
C++
965 lines
34 KiB
C++
//===-- MachineFunction.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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// Collect native machine code information for a function. This allows
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// target-specific information about the generated code to be stored with each
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// function.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Analysis/ConstantFolding.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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using namespace llvm;
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#define DEBUG_TYPE "codegen"
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//===----------------------------------------------------------------------===//
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// MachineFunction implementation
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//===----------------------------------------------------------------------===//
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// Out of line virtual method.
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MachineFunctionInfo::~MachineFunctionInfo() {}
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void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
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MBB->getParent()->DeleteMachineBasicBlock(MBB);
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}
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MachineFunction::MachineFunction(const Function *F, const TargetMachine &TM,
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unsigned FunctionNum, MachineModuleInfo &mmi)
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: Fn(F), Target(TM), STI(TM.getSubtargetImpl(*F)), Ctx(mmi.getContext()),
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MMI(mmi) {
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if (STI->getRegisterInfo())
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RegInfo = new (Allocator) MachineRegisterInfo(this);
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else
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RegInfo = nullptr;
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MFInfo = nullptr;
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FrameInfo = new (Allocator)
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MachineFrameInfo(STI->getFrameLowering()->getStackAlignment(),
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STI->getFrameLowering()->isStackRealignable(),
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!F->hasFnAttribute("no-realign-stack"));
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if (Fn->hasFnAttribute(Attribute::StackAlignment))
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FrameInfo->ensureMaxAlignment(Fn->getFnStackAlignment());
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ConstantPool = new (Allocator) MachineConstantPool(TM);
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Alignment = STI->getTargetLowering()->getMinFunctionAlignment();
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// FIXME: Shouldn't use pref alignment if explicit alignment is set on Fn.
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if (!Fn->hasFnAttribute(Attribute::OptimizeForSize))
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Alignment = std::max(Alignment,
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STI->getTargetLowering()->getPrefFunctionAlignment());
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FunctionNumber = FunctionNum;
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JumpTableInfo = nullptr;
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}
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MachineFunction::~MachineFunction() {
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// Don't call destructors on MachineInstr and MachineOperand. All of their
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// memory comes from the BumpPtrAllocator which is about to be purged.
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//
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// Do call MachineBasicBlock destructors, it contains std::vectors.
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for (iterator I = begin(), E = end(); I != E; I = BasicBlocks.erase(I))
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I->Insts.clearAndLeakNodesUnsafely();
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InstructionRecycler.clear(Allocator);
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OperandRecycler.clear(Allocator);
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BasicBlockRecycler.clear(Allocator);
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if (RegInfo) {
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RegInfo->~MachineRegisterInfo();
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Allocator.Deallocate(RegInfo);
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}
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if (MFInfo) {
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MFInfo->~MachineFunctionInfo();
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Allocator.Deallocate(MFInfo);
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}
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FrameInfo->~MachineFrameInfo();
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Allocator.Deallocate(FrameInfo);
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ConstantPool->~MachineConstantPool();
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Allocator.Deallocate(ConstantPool);
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if (JumpTableInfo) {
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JumpTableInfo->~MachineJumpTableInfo();
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Allocator.Deallocate(JumpTableInfo);
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}
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}
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/// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
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/// does already exist, allocate one.
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MachineJumpTableInfo *MachineFunction::
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getOrCreateJumpTableInfo(unsigned EntryKind) {
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if (JumpTableInfo) return JumpTableInfo;
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JumpTableInfo = new (Allocator)
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MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind);
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return JumpTableInfo;
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}
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/// Should we be emitting segmented stack stuff for the function
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bool MachineFunction::shouldSplitStack() {
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return getFunction()->hasFnAttribute("split-stack");
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}
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/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
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/// recomputes them. This guarantees that the MBB numbers are sequential,
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/// dense, and match the ordering of the blocks within the function. If a
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/// specific MachineBasicBlock is specified, only that block and those after
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/// it are renumbered.
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void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
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if (empty()) { MBBNumbering.clear(); return; }
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MachineFunction::iterator MBBI, E = end();
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if (MBB == nullptr)
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MBBI = begin();
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else
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MBBI = MBB;
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// Figure out the block number this should have.
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unsigned BlockNo = 0;
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if (MBBI != begin())
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BlockNo = std::prev(MBBI)->getNumber() + 1;
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for (; MBBI != E; ++MBBI, ++BlockNo) {
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if (MBBI->getNumber() != (int)BlockNo) {
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// Remove use of the old number.
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if (MBBI->getNumber() != -1) {
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assert(MBBNumbering[MBBI->getNumber()] == &*MBBI &&
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"MBB number mismatch!");
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MBBNumbering[MBBI->getNumber()] = nullptr;
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}
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// If BlockNo is already taken, set that block's number to -1.
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if (MBBNumbering[BlockNo])
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MBBNumbering[BlockNo]->setNumber(-1);
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MBBNumbering[BlockNo] = MBBI;
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MBBI->setNumber(BlockNo);
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}
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}
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// Okay, all the blocks are renumbered. If we have compactified the block
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// numbering, shrink MBBNumbering now.
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assert(BlockNo <= MBBNumbering.size() && "Mismatch!");
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MBBNumbering.resize(BlockNo);
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}
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/// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
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/// of `new MachineInstr'.
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///
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MachineInstr *
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MachineFunction::CreateMachineInstr(const MCInstrDesc &MCID,
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DebugLoc DL, bool NoImp) {
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return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
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MachineInstr(*this, MCID, DL, NoImp);
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}
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/// CloneMachineInstr - Create a new MachineInstr which is a copy of the
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/// 'Orig' instruction, identical in all ways except the instruction
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/// has no parent, prev, or next.
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///
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MachineInstr *
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MachineFunction::CloneMachineInstr(const MachineInstr *Orig) {
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return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
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MachineInstr(*this, *Orig);
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}
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/// DeleteMachineInstr - Delete the given MachineInstr.
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///
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/// This function also serves as the MachineInstr destructor - the real
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/// ~MachineInstr() destructor must be empty.
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void
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MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
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// Strip it for parts. The operand array and the MI object itself are
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// independently recyclable.
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if (MI->Operands)
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deallocateOperandArray(MI->CapOperands, MI->Operands);
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// Don't call ~MachineInstr() which must be trivial anyway because
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// ~MachineFunction drops whole lists of MachineInstrs wihout calling their
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// destructors.
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InstructionRecycler.Deallocate(Allocator, MI);
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}
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/// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
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/// instead of `new MachineBasicBlock'.
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///
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MachineBasicBlock *
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MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) {
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return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator))
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MachineBasicBlock(*this, bb);
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}
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/// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
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///
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void
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MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
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assert(MBB->getParent() == this && "MBB parent mismatch!");
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MBB->~MachineBasicBlock();
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BasicBlockRecycler.Deallocate(Allocator, MBB);
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}
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MachineMemOperand *
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MachineFunction::getMachineMemOperand(MachinePointerInfo PtrInfo, unsigned f,
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uint64_t s, unsigned base_alignment,
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const AAMDNodes &AAInfo,
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const MDNode *Ranges) {
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return new (Allocator) MachineMemOperand(PtrInfo, f, s, base_alignment,
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AAInfo, Ranges);
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}
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MachineMemOperand *
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MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO,
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int64_t Offset, uint64_t Size) {
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if (MMO->getValue())
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return new (Allocator)
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MachineMemOperand(MachinePointerInfo(MMO->getValue(),
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MMO->getOffset()+Offset),
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MMO->getFlags(), Size,
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MMO->getBaseAlignment());
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return new (Allocator)
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MachineMemOperand(MachinePointerInfo(MMO->getPseudoValue(),
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MMO->getOffset()+Offset),
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MMO->getFlags(), Size,
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MMO->getBaseAlignment());
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}
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MachineInstr::mmo_iterator
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MachineFunction::allocateMemRefsArray(unsigned long Num) {
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return Allocator.Allocate<MachineMemOperand *>(Num);
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}
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std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
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MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin,
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MachineInstr::mmo_iterator End) {
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// Count the number of load mem refs.
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unsigned Num = 0;
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for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
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if ((*I)->isLoad())
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++Num;
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// Allocate a new array and populate it with the load information.
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MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
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unsigned Index = 0;
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for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
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if ((*I)->isLoad()) {
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if (!(*I)->isStore())
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// Reuse the MMO.
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Result[Index] = *I;
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else {
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// Clone the MMO and unset the store flag.
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MachineMemOperand *JustLoad =
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getMachineMemOperand((*I)->getPointerInfo(),
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(*I)->getFlags() & ~MachineMemOperand::MOStore,
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(*I)->getSize(), (*I)->getBaseAlignment(),
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(*I)->getAAInfo());
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Result[Index] = JustLoad;
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}
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++Index;
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}
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}
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return std::make_pair(Result, Result + Num);
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}
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std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
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MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin,
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MachineInstr::mmo_iterator End) {
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// Count the number of load mem refs.
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unsigned Num = 0;
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for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
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if ((*I)->isStore())
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++Num;
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// Allocate a new array and populate it with the store information.
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MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
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unsigned Index = 0;
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for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
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if ((*I)->isStore()) {
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if (!(*I)->isLoad())
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// Reuse the MMO.
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Result[Index] = *I;
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else {
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// Clone the MMO and unset the load flag.
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MachineMemOperand *JustStore =
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getMachineMemOperand((*I)->getPointerInfo(),
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(*I)->getFlags() & ~MachineMemOperand::MOLoad,
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(*I)->getSize(), (*I)->getBaseAlignment(),
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(*I)->getAAInfo());
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Result[Index] = JustStore;
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}
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++Index;
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}
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}
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return std::make_pair(Result, Result + Num);
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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void MachineFunction::dump() const {
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print(dbgs());
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}
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#endif
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StringRef MachineFunction::getName() const {
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assert(getFunction() && "No function!");
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return getFunction()->getName();
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}
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void MachineFunction::print(raw_ostream &OS, SlotIndexes *Indexes) const {
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OS << "# Machine code for function " << getName() << ": ";
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if (RegInfo) {
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OS << (RegInfo->isSSA() ? "SSA" : "Post SSA");
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if (!RegInfo->tracksLiveness())
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OS << ", not tracking liveness";
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}
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OS << '\n';
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// Print Frame Information
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FrameInfo->print(*this, OS);
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// Print JumpTable Information
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if (JumpTableInfo)
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JumpTableInfo->print(OS);
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// Print Constant Pool
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ConstantPool->print(OS);
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const TargetRegisterInfo *TRI = getSubtarget().getRegisterInfo();
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if (RegInfo && !RegInfo->livein_empty()) {
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OS << "Function Live Ins: ";
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for (MachineRegisterInfo::livein_iterator
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I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) {
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OS << PrintReg(I->first, TRI);
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if (I->second)
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OS << " in " << PrintReg(I->second, TRI);
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if (std::next(I) != E)
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OS << ", ";
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}
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OS << '\n';
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}
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for (const auto &BB : *this) {
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OS << '\n';
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BB.print(OS, Indexes);
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}
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OS << "\n# End machine code for function " << getName() << ".\n\n";
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}
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namespace llvm {
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template<>
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struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
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DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
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static std::string getGraphName(const MachineFunction *F) {
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return ("CFG for '" + F->getName() + "' function").str();
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}
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std::string getNodeLabel(const MachineBasicBlock *Node,
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const MachineFunction *Graph) {
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std::string OutStr;
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{
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raw_string_ostream OSS(OutStr);
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if (isSimple()) {
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OSS << "BB#" << Node->getNumber();
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if (const BasicBlock *BB = Node->getBasicBlock())
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OSS << ": " << BB->getName();
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} else
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Node->print(OSS);
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}
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if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
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// Process string output to make it nicer...
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for (unsigned i = 0; i != OutStr.length(); ++i)
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if (OutStr[i] == '\n') { // Left justify
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OutStr[i] = '\\';
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OutStr.insert(OutStr.begin()+i+1, 'l');
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}
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return OutStr;
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}
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};
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}
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void MachineFunction::viewCFG() const
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{
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#ifndef NDEBUG
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ViewGraph(this, "mf" + getName());
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#else
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errs() << "MachineFunction::viewCFG is only available in debug builds on "
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<< "systems with Graphviz or gv!\n";
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#endif // NDEBUG
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}
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void MachineFunction::viewCFGOnly() const
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{
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#ifndef NDEBUG
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ViewGraph(this, "mf" + getName(), true);
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#else
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errs() << "MachineFunction::viewCFGOnly is only available in debug builds on "
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<< "systems with Graphviz or gv!\n";
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#endif // NDEBUG
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}
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/// addLiveIn - Add the specified physical register as a live-in value and
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/// create a corresponding virtual register for it.
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unsigned MachineFunction::addLiveIn(unsigned PReg,
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const TargetRegisterClass *RC) {
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MachineRegisterInfo &MRI = getRegInfo();
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unsigned VReg = MRI.getLiveInVirtReg(PReg);
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if (VReg) {
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const TargetRegisterClass *VRegRC = MRI.getRegClass(VReg);
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(void)VRegRC;
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// A physical register can be added several times.
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// Between two calls, the register class of the related virtual register
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// may have been constrained to match some operation constraints.
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// In that case, check that the current register class includes the
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// physical register and is a sub class of the specified RC.
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assert((VRegRC == RC || (VRegRC->contains(PReg) &&
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RC->hasSubClassEq(VRegRC))) &&
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"Register class mismatch!");
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return VReg;
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}
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VReg = MRI.createVirtualRegister(RC);
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MRI.addLiveIn(PReg, VReg);
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return VReg;
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}
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/// getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
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/// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a
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/// normal 'L' label is returned.
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MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
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bool isLinkerPrivate) const {
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const DataLayout *DL = getTarget().getDataLayout();
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assert(JumpTableInfo && "No jump tables");
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assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!");
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const char *Prefix = isLinkerPrivate ? DL->getLinkerPrivateGlobalPrefix() :
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DL->getPrivateGlobalPrefix();
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SmallString<60> Name;
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raw_svector_ostream(Name)
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<< Prefix << "JTI" << getFunctionNumber() << '_' << JTI;
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return Ctx.getOrCreateSymbol(Name);
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}
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/// getPICBaseSymbol - Return a function-local symbol to represent the PIC
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/// base.
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MCSymbol *MachineFunction::getPICBaseSymbol() const {
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const DataLayout *DL = getTarget().getDataLayout();
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return Ctx.getOrCreateSymbol(Twine(DL->getPrivateGlobalPrefix())+
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Twine(getFunctionNumber())+"$pb");
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}
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|
|
//===----------------------------------------------------------------------===//
|
|
// MachineFrameInfo implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// ensureMaxAlignment - Make sure the function is at least Align bytes
|
|
/// aligned.
|
|
void MachineFrameInfo::ensureMaxAlignment(unsigned Align) {
|
|
if (!StackRealignable || !RealignOption)
|
|
assert(Align <= StackAlignment &&
|
|
"For targets without stack realignment, Align is out of limit!");
|
|
if (MaxAlignment < Align) MaxAlignment = Align;
|
|
}
|
|
|
|
/// clampStackAlignment - Clamp the alignment if requested and emit a warning.
|
|
static inline unsigned clampStackAlignment(bool ShouldClamp, unsigned Align,
|
|
unsigned StackAlign) {
|
|
if (!ShouldClamp || Align <= StackAlign)
|
|
return Align;
|
|
DEBUG(dbgs() << "Warning: requested alignment " << Align
|
|
<< " exceeds the stack alignment " << StackAlign
|
|
<< " when stack realignment is off" << '\n');
|
|
return StackAlign;
|
|
}
|
|
|
|
/// CreateStackObject - Create a new statically sized stack object, returning
|
|
/// a nonnegative identifier to represent it.
|
|
///
|
|
int MachineFrameInfo::CreateStackObject(uint64_t Size, unsigned Alignment,
|
|
bool isSS, const AllocaInst *Alloca) {
|
|
assert(Size != 0 && "Cannot allocate zero size stack objects!");
|
|
Alignment = clampStackAlignment(!StackRealignable || !RealignOption,
|
|
Alignment, StackAlignment);
|
|
Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, Alloca,
|
|
!isSS));
|
|
int Index = (int)Objects.size() - NumFixedObjects - 1;
|
|
assert(Index >= 0 && "Bad frame index!");
|
|
ensureMaxAlignment(Alignment);
|
|
return Index;
|
|
}
|
|
|
|
/// CreateSpillStackObject - Create a new statically sized stack object that
|
|
/// represents a spill slot, returning a nonnegative identifier to represent
|
|
/// it.
|
|
///
|
|
int MachineFrameInfo::CreateSpillStackObject(uint64_t Size,
|
|
unsigned Alignment) {
|
|
Alignment = clampStackAlignment(!StackRealignable || !RealignOption,
|
|
Alignment, StackAlignment);
|
|
CreateStackObject(Size, Alignment, true);
|
|
int Index = (int)Objects.size() - NumFixedObjects - 1;
|
|
ensureMaxAlignment(Alignment);
|
|
return Index;
|
|
}
|
|
|
|
/// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
|
|
/// variable sized object has been created. This must be created whenever a
|
|
/// variable sized object is created, whether or not the index returned is
|
|
/// actually used.
|
|
///
|
|
int MachineFrameInfo::CreateVariableSizedObject(unsigned Alignment,
|
|
const AllocaInst *Alloca) {
|
|
HasVarSizedObjects = true;
|
|
Alignment = clampStackAlignment(!StackRealignable || !RealignOption,
|
|
Alignment, StackAlignment);
|
|
Objects.push_back(StackObject(0, Alignment, 0, false, false, Alloca, true));
|
|
ensureMaxAlignment(Alignment);
|
|
return (int)Objects.size()-NumFixedObjects-1;
|
|
}
|
|
|
|
/// CreateFixedObject - Create a new object at a fixed location on the stack.
|
|
/// All fixed objects should be created before other objects are created for
|
|
/// efficiency. By default, fixed objects are immutable. This returns an
|
|
/// index with a negative value.
|
|
///
|
|
int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
|
|
bool Immutable, bool isAliased) {
|
|
assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
|
|
// The alignment of the frame index can be determined from its offset from
|
|
// the incoming frame position. If the frame object is at offset 32 and
|
|
// the stack is guaranteed to be 16-byte aligned, then we know that the
|
|
// object is 16-byte aligned.
|
|
unsigned Align = MinAlign(SPOffset, StackAlignment);
|
|
Align = clampStackAlignment(!StackRealignable || !RealignOption, Align,
|
|
StackAlignment);
|
|
Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable,
|
|
/*isSS*/ false,
|
|
/*Alloca*/ nullptr, isAliased));
|
|
return -++NumFixedObjects;
|
|
}
|
|
|
|
/// CreateFixedSpillStackObject - Create a spill slot at a fixed location
|
|
/// on the stack. Returns an index with a negative value.
|
|
int MachineFrameInfo::CreateFixedSpillStackObject(uint64_t Size,
|
|
int64_t SPOffset) {
|
|
unsigned Align = MinAlign(SPOffset, StackAlignment);
|
|
Align = clampStackAlignment(!StackRealignable || !RealignOption, Align,
|
|
StackAlignment);
|
|
Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset,
|
|
/*Immutable*/ true,
|
|
/*isSS*/ true,
|
|
/*Alloca*/ nullptr,
|
|
/*isAliased*/ false));
|
|
return -++NumFixedObjects;
|
|
}
|
|
|
|
BitVector MachineFrameInfo::getPristineRegs(const MachineFunction &MF) const {
|
|
const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
|
|
BitVector BV(TRI->getNumRegs());
|
|
|
|
// Before CSI is calculated, no registers are considered pristine. They can be
|
|
// freely used and PEI will make sure they are saved.
|
|
if (!isCalleeSavedInfoValid())
|
|
return BV;
|
|
|
|
for (const MCPhysReg *CSR = TRI->getCalleeSavedRegs(&MF); CSR && *CSR; ++CSR)
|
|
BV.set(*CSR);
|
|
|
|
// Saved CSRs are not pristine.
|
|
const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo();
|
|
for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
|
|
E = CSI.end(); I != E; ++I)
|
|
BV.reset(I->getReg());
|
|
|
|
return BV;
|
|
}
|
|
|
|
unsigned MachineFrameInfo::estimateStackSize(const MachineFunction &MF) const {
|
|
const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
|
|
const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
|
|
unsigned MaxAlign = getMaxAlignment();
|
|
int Offset = 0;
|
|
|
|
// This code is very, very similar to PEI::calculateFrameObjectOffsets().
|
|
// It really should be refactored to share code. Until then, changes
|
|
// should keep in mind that there's tight coupling between the two.
|
|
|
|
for (int i = getObjectIndexBegin(); i != 0; ++i) {
|
|
int FixedOff = -getObjectOffset(i);
|
|
if (FixedOff > Offset) Offset = FixedOff;
|
|
}
|
|
for (unsigned i = 0, e = getObjectIndexEnd(); i != e; ++i) {
|
|
if (isDeadObjectIndex(i))
|
|
continue;
|
|
Offset += getObjectSize(i);
|
|
unsigned Align = getObjectAlignment(i);
|
|
// Adjust to alignment boundary
|
|
Offset = (Offset+Align-1)/Align*Align;
|
|
|
|
MaxAlign = std::max(Align, MaxAlign);
|
|
}
|
|
|
|
if (adjustsStack() && TFI->hasReservedCallFrame(MF))
|
|
Offset += getMaxCallFrameSize();
|
|
|
|
// Round up the size to a multiple of the alignment. If the function has
|
|
// any calls or alloca's, align to the target's StackAlignment value to
|
|
// ensure that the callee's frame or the alloca data is suitably aligned;
|
|
// otherwise, for leaf functions, align to the TransientStackAlignment
|
|
// value.
|
|
unsigned StackAlign;
|
|
if (adjustsStack() || hasVarSizedObjects() ||
|
|
(RegInfo->needsStackRealignment(MF) && getObjectIndexEnd() != 0))
|
|
StackAlign = TFI->getStackAlignment();
|
|
else
|
|
StackAlign = TFI->getTransientStackAlignment();
|
|
|
|
// If the frame pointer is eliminated, all frame offsets will be relative to
|
|
// SP not FP. Align to MaxAlign so this works.
|
|
StackAlign = std::max(StackAlign, MaxAlign);
|
|
unsigned AlignMask = StackAlign - 1;
|
|
Offset = (Offset + AlignMask) & ~uint64_t(AlignMask);
|
|
|
|
return (unsigned)Offset;
|
|
}
|
|
|
|
void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{
|
|
if (Objects.empty()) return;
|
|
|
|
const TargetFrameLowering *FI = MF.getSubtarget().getFrameLowering();
|
|
int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);
|
|
|
|
OS << "Frame Objects:\n";
|
|
|
|
for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
|
|
const StackObject &SO = Objects[i];
|
|
OS << " fi#" << (int)(i-NumFixedObjects) << ": ";
|
|
if (SO.Size == ~0ULL) {
|
|
OS << "dead\n";
|
|
continue;
|
|
}
|
|
if (SO.Size == 0)
|
|
OS << "variable sized";
|
|
else
|
|
OS << "size=" << SO.Size;
|
|
OS << ", align=" << SO.Alignment;
|
|
|
|
if (i < NumFixedObjects)
|
|
OS << ", fixed";
|
|
if (i < NumFixedObjects || SO.SPOffset != -1) {
|
|
int64_t Off = SO.SPOffset - ValOffset;
|
|
OS << ", at location [SP";
|
|
if (Off > 0)
|
|
OS << "+" << Off;
|
|
else if (Off < 0)
|
|
OS << Off;
|
|
OS << "]";
|
|
}
|
|
OS << "\n";
|
|
}
|
|
}
|
|
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
|
void MachineFrameInfo::dump(const MachineFunction &MF) const {
|
|
print(MF, dbgs());
|
|
}
|
|
#endif
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// MachineJumpTableInfo implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// getEntrySize - Return the size of each entry in the jump table.
|
|
unsigned MachineJumpTableInfo::getEntrySize(const DataLayout &TD) const {
|
|
// The size of a jump table entry is 4 bytes unless the entry is just the
|
|
// address of a block, in which case it is the pointer size.
|
|
switch (getEntryKind()) {
|
|
case MachineJumpTableInfo::EK_BlockAddress:
|
|
return TD.getPointerSize();
|
|
case MachineJumpTableInfo::EK_GPRel64BlockAddress:
|
|
return 8;
|
|
case MachineJumpTableInfo::EK_GPRel32BlockAddress:
|
|
case MachineJumpTableInfo::EK_LabelDifference32:
|
|
case MachineJumpTableInfo::EK_Custom32:
|
|
return 4;
|
|
case MachineJumpTableInfo::EK_Inline:
|
|
return 0;
|
|
}
|
|
llvm_unreachable("Unknown jump table encoding!");
|
|
}
|
|
|
|
/// getEntryAlignment - Return the alignment of each entry in the jump table.
|
|
unsigned MachineJumpTableInfo::getEntryAlignment(const DataLayout &TD) const {
|
|
// The alignment of a jump table entry is the alignment of int32 unless the
|
|
// entry is just the address of a block, in which case it is the pointer
|
|
// alignment.
|
|
switch (getEntryKind()) {
|
|
case MachineJumpTableInfo::EK_BlockAddress:
|
|
return TD.getPointerABIAlignment();
|
|
case MachineJumpTableInfo::EK_GPRel64BlockAddress:
|
|
return TD.getABIIntegerTypeAlignment(64);
|
|
case MachineJumpTableInfo::EK_GPRel32BlockAddress:
|
|
case MachineJumpTableInfo::EK_LabelDifference32:
|
|
case MachineJumpTableInfo::EK_Custom32:
|
|
return TD.getABIIntegerTypeAlignment(32);
|
|
case MachineJumpTableInfo::EK_Inline:
|
|
return 1;
|
|
}
|
|
llvm_unreachable("Unknown jump table encoding!");
|
|
}
|
|
|
|
/// createJumpTableIndex - Create a new jump table entry in the jump table info.
|
|
///
|
|
unsigned MachineJumpTableInfo::createJumpTableIndex(
|
|
const std::vector<MachineBasicBlock*> &DestBBs) {
|
|
assert(!DestBBs.empty() && "Cannot create an empty jump table!");
|
|
JumpTables.push_back(MachineJumpTableEntry(DestBBs));
|
|
return JumpTables.size()-1;
|
|
}
|
|
|
|
/// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
|
|
/// the jump tables to branch to New instead.
|
|
bool MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old,
|
|
MachineBasicBlock *New) {
|
|
assert(Old != New && "Not making a change?");
|
|
bool MadeChange = false;
|
|
for (size_t i = 0, e = JumpTables.size(); i != e; ++i)
|
|
ReplaceMBBInJumpTable(i, Old, New);
|
|
return MadeChange;
|
|
}
|
|
|
|
/// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update
|
|
/// the jump table to branch to New instead.
|
|
bool MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx,
|
|
MachineBasicBlock *Old,
|
|
MachineBasicBlock *New) {
|
|
assert(Old != New && "Not making a change?");
|
|
bool MadeChange = false;
|
|
MachineJumpTableEntry &JTE = JumpTables[Idx];
|
|
for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
|
|
if (JTE.MBBs[j] == Old) {
|
|
JTE.MBBs[j] = New;
|
|
MadeChange = true;
|
|
}
|
|
return MadeChange;
|
|
}
|
|
|
|
void MachineJumpTableInfo::print(raw_ostream &OS) const {
|
|
if (JumpTables.empty()) return;
|
|
|
|
OS << "Jump Tables:\n";
|
|
|
|
for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
|
|
OS << " jt#" << i << ": ";
|
|
for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j)
|
|
OS << " BB#" << JumpTables[i].MBBs[j]->getNumber();
|
|
}
|
|
|
|
OS << '\n';
|
|
}
|
|
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
|
void MachineJumpTableInfo::dump() const { print(dbgs()); }
|
|
#endif
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// MachineConstantPool implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void MachineConstantPoolValue::anchor() { }
|
|
|
|
const DataLayout *MachineConstantPool::getDataLayout() const {
|
|
return TM.getDataLayout();
|
|
}
|
|
|
|
Type *MachineConstantPoolEntry::getType() const {
|
|
if (isMachineConstantPoolEntry())
|
|
return Val.MachineCPVal->getType();
|
|
return Val.ConstVal->getType();
|
|
}
|
|
|
|
|
|
unsigned MachineConstantPoolEntry::getRelocationInfo() const {
|
|
if (isMachineConstantPoolEntry())
|
|
return Val.MachineCPVal->getRelocationInfo();
|
|
return Val.ConstVal->getRelocationInfo();
|
|
}
|
|
|
|
SectionKind
|
|
MachineConstantPoolEntry::getSectionKind(const DataLayout *DL) const {
|
|
SectionKind Kind;
|
|
switch (getRelocationInfo()) {
|
|
default:
|
|
llvm_unreachable("Unknown section kind");
|
|
case Constant::GlobalRelocations:
|
|
Kind = SectionKind::getReadOnlyWithRel();
|
|
break;
|
|
case Constant::LocalRelocation:
|
|
Kind = SectionKind::getReadOnlyWithRelLocal();
|
|
break;
|
|
case Constant::NoRelocation:
|
|
switch (DL->getTypeAllocSize(getType())) {
|
|
case 4:
|
|
Kind = SectionKind::getMergeableConst4();
|
|
break;
|
|
case 8:
|
|
Kind = SectionKind::getMergeableConst8();
|
|
break;
|
|
case 16:
|
|
Kind = SectionKind::getMergeableConst16();
|
|
break;
|
|
default:
|
|
Kind = SectionKind::getReadOnly();
|
|
break;
|
|
}
|
|
}
|
|
return Kind;
|
|
}
|
|
|
|
MachineConstantPool::~MachineConstantPool() {
|
|
for (unsigned i = 0, e = Constants.size(); i != e; ++i)
|
|
if (Constants[i].isMachineConstantPoolEntry())
|
|
delete Constants[i].Val.MachineCPVal;
|
|
for (DenseSet<MachineConstantPoolValue*>::iterator I =
|
|
MachineCPVsSharingEntries.begin(), E = MachineCPVsSharingEntries.end();
|
|
I != E; ++I)
|
|
delete *I;
|
|
}
|
|
|
|
/// CanShareConstantPoolEntry - Test whether the given two constants
|
|
/// can be allocated the same constant pool entry.
|
|
static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B,
|
|
const DataLayout *TD) {
|
|
// Handle the trivial case quickly.
|
|
if (A == B) return true;
|
|
|
|
// If they have the same type but weren't the same constant, quickly
|
|
// reject them.
|
|
if (A->getType() == B->getType()) return false;
|
|
|
|
// We can't handle structs or arrays.
|
|
if (isa<StructType>(A->getType()) || isa<ArrayType>(A->getType()) ||
|
|
isa<StructType>(B->getType()) || isa<ArrayType>(B->getType()))
|
|
return false;
|
|
|
|
// For now, only support constants with the same size.
|
|
uint64_t StoreSize = TD->getTypeStoreSize(A->getType());
|
|
if (StoreSize != TD->getTypeStoreSize(B->getType()) || StoreSize > 128)
|
|
return false;
|
|
|
|
Type *IntTy = IntegerType::get(A->getContext(), StoreSize*8);
|
|
|
|
// Try constant folding a bitcast of both instructions to an integer. If we
|
|
// get two identical ConstantInt's, then we are good to share them. We use
|
|
// the constant folding APIs to do this so that we get the benefit of
|
|
// DataLayout.
|
|
if (isa<PointerType>(A->getType()))
|
|
A = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
|
|
const_cast<Constant *>(A), *TD);
|
|
else if (A->getType() != IntTy)
|
|
A = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
|
|
const_cast<Constant *>(A), *TD);
|
|
if (isa<PointerType>(B->getType()))
|
|
B = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
|
|
const_cast<Constant *>(B), *TD);
|
|
else if (B->getType() != IntTy)
|
|
B = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
|
|
const_cast<Constant *>(B), *TD);
|
|
|
|
return A == B;
|
|
}
|
|
|
|
/// getConstantPoolIndex - Create a new entry in the constant pool or return
|
|
/// an existing one. User must specify the log2 of the minimum required
|
|
/// alignment for the object.
|
|
///
|
|
unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C,
|
|
unsigned Alignment) {
|
|
assert(Alignment && "Alignment must be specified!");
|
|
if (Alignment > PoolAlignment) PoolAlignment = Alignment;
|
|
|
|
// Check to see if we already have this constant.
|
|
//
|
|
// FIXME, this could be made much more efficient for large constant pools.
|
|
for (unsigned i = 0, e = Constants.size(); i != e; ++i)
|
|
if (!Constants[i].isMachineConstantPoolEntry() &&
|
|
CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C,
|
|
getDataLayout())) {
|
|
if ((unsigned)Constants[i].getAlignment() < Alignment)
|
|
Constants[i].Alignment = Alignment;
|
|
return i;
|
|
}
|
|
|
|
Constants.push_back(MachineConstantPoolEntry(C, Alignment));
|
|
return Constants.size()-1;
|
|
}
|
|
|
|
unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V,
|
|
unsigned Alignment) {
|
|
assert(Alignment && "Alignment must be specified!");
|
|
if (Alignment > PoolAlignment) PoolAlignment = Alignment;
|
|
|
|
// Check to see if we already have this constant.
|
|
//
|
|
// FIXME, this could be made much more efficient for large constant pools.
|
|
int Idx = V->getExistingMachineCPValue(this, Alignment);
|
|
if (Idx != -1) {
|
|
MachineCPVsSharingEntries.insert(V);
|
|
return (unsigned)Idx;
|
|
}
|
|
|
|
Constants.push_back(MachineConstantPoolEntry(V, Alignment));
|
|
return Constants.size()-1;
|
|
}
|
|
|
|
void MachineConstantPool::print(raw_ostream &OS) const {
|
|
if (Constants.empty()) return;
|
|
|
|
OS << "Constant Pool:\n";
|
|
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
|
|
OS << " cp#" << i << ": ";
|
|
if (Constants[i].isMachineConstantPoolEntry())
|
|
Constants[i].Val.MachineCPVal->print(OS);
|
|
else
|
|
Constants[i].Val.ConstVal->printAsOperand(OS, /*PrintType=*/false);
|
|
OS << ", align=" << Constants[i].getAlignment();
|
|
OS << "\n";
|
|
}
|
|
}
|
|
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
|
void MachineConstantPool::dump() const { print(dbgs()); }
|
|
#endif
|