2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
//===-------------- BPFMIChecking.cpp - MI Checking Legality -------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass performs checking to signal errors for certain illegal usages at
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// MachineInstruction layer. Specially, the result of XADD{32,64} insn should
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// not be used. The pass is done at the PreEmit pass right before the
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// machine code is emitted at which point the register liveness information
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// is still available.
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//
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//===----------------------------------------------------------------------===//
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#include "BPF.h"
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#include "BPFInstrInfo.h"
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#include "BPFTargetMachine.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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using namespace llvm;
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#define DEBUG_TYPE "bpf-mi-checking"
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namespace {
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struct BPFMIPreEmitChecking : public MachineFunctionPass {
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static char ID;
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MachineFunction *MF;
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const TargetRegisterInfo *TRI;
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BPFMIPreEmitChecking() : MachineFunctionPass(ID) {
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initializeBPFMIPreEmitCheckingPass(*PassRegistry::getPassRegistry());
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}
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private:
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// Initialize class variables.
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void initialize(MachineFunction &MFParm);
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void checkingIllegalXADD(void);
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public:
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// Main entry point for this pass.
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bool runOnMachineFunction(MachineFunction &MF) override {
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if (!skipFunction(MF.getFunction())) {
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initialize(MF);
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checkingIllegalXADD();
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}
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return false;
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}
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};
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// Initialize class variables.
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void BPFMIPreEmitChecking::initialize(MachineFunction &MFParm) {
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MF = &MFParm;
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TRI = MF->getSubtarget<BPFSubtarget>().getRegisterInfo();
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LLVM_DEBUG(dbgs() << "*** BPF PreEmit checking pass ***\n\n");
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}
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void BPFMIPreEmitChecking::checkingIllegalXADD(void) {
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for (MachineBasicBlock &MBB : *MF) {
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for (MachineInstr &MI : MBB) {
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if (MI.getOpcode() != BPF::XADD32 && MI.getOpcode() != BPF::XADD64)
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continue;
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LLVM_DEBUG(MI.dump());
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if (!MI.allDefsAreDead()) {
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DebugLoc Empty;
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const DebugLoc &DL = MI.getDebugLoc();
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if (DL != Empty)
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report_fatal_error("line " + std::to_string(DL.getLine()) +
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": Invalid usage of the XADD return value", false);
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else
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report_fatal_error("Invalid usage of the XADD return value", false);
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}
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}
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}
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return;
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}
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} // end default namespace
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INITIALIZE_PASS(BPFMIPreEmitChecking, "bpf-mi-pemit-checking",
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"BPF PreEmit Checking", false, false)
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char BPFMIPreEmitChecking::ID = 0;
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FunctionPass* llvm::createBPFMIPreEmitCheckingPass()
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{
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return new BPFMIPreEmitChecking();
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}
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