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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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
//===--- SIDebuggerInsertNops.cpp - Inserts nops for debugger usage -------===//
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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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/// \file
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/// Inserts one nop instruction for each high level source statement for
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/// debugger usage.
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///
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/// Tools, such as a debugger, need to pause execution based on user input (i.e.
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/// breakpoint). In order to do this, one nop instruction is inserted before the
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/// first isa instruction of each high level source statement. Further, the
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/// debugger may replace nop instructions with trap instructions based on user
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/// input.
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//
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//===----------------------------------------------------------------------===//
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#include "AMDGPUSubtarget.h"
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#include "SIInstrInfo.h"
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#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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using namespace llvm;
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#define DEBUG_TYPE "si-debugger-insert-nops"
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#define PASS_NAME "SI Debugger Insert Nops"
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namespace {
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class SIDebuggerInsertNops : public MachineFunctionPass {
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public:
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static char ID;
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SIDebuggerInsertNops() : MachineFunctionPass(ID) { }
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StringRef getPassName() const override { return PASS_NAME; }
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesCFG();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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bool runOnMachineFunction(MachineFunction &MF) override;
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};
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} // anonymous namespace
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INITIALIZE_PASS(SIDebuggerInsertNops, DEBUG_TYPE, PASS_NAME, false, false)
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char SIDebuggerInsertNops::ID = 0;
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char &llvm::SIDebuggerInsertNopsID = SIDebuggerInsertNops::ID;
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FunctionPass *llvm::createSIDebuggerInsertNopsPass() {
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return new SIDebuggerInsertNops();
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}
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bool SIDebuggerInsertNops::runOnMachineFunction(MachineFunction &MF) {
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// Skip this pass if "amdgpu-debugger-insert-nops" attribute was not
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// specified.
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const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
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if (!ST.debuggerInsertNops())
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return false;
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// Skip machine functions without debug info.
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if (!MF.getMMI().hasDebugInfo())
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return false;
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// Target instruction info.
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const SIInstrInfo *TII = ST.getInstrInfo();
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// Set containing line numbers that have nop inserted.
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DenseSet<unsigned> NopInserted;
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for (auto &MBB : MF) {
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for (auto MI = MBB.begin(); MI != MBB.end(); ++MI) {
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// Skip debug instructions and instructions without location.
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if (MI->isDebugInstr() || !MI->getDebugLoc())
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continue;
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// Insert nop instruction if line number does not have nop inserted.
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auto DL = MI->getDebugLoc();
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if (NopInserted.find(DL.getLine()) == NopInserted.end()) {
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BuildMI(MBB, *MI, DL, TII->get(AMDGPU::S_NOP))
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.addImm(0);
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NopInserted.insert(DL.getLine());
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}
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}
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}
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return true;
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}
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