8c273ad719
Also, - Skip pass if machine module does not have debug info - Minor comment changes - Added test Differential Revision: http://reviews.llvm.org/D19079 llvm-svn: 266626
110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
//===--- SIInsertNopsPass.cpp - Use predicates for control flow -----------===//
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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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/// \file
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/// \brief Insert two nop instructions for each high level source statement.
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///
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/// Tools, such as debugger, need to pause execution based on user input (i.e.
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/// breakpoint). In order to do this, two nop instructions are inserted for each
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/// high level source statement: one before first isa instruction of high level
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/// source statement, and one after last isa instruction of high level source
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/// statement. Further, debugger may replace nop instructions with trap
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/// instructions based on user input.
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//
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//===----------------------------------------------------------------------===//
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#include "SIInstrInfo.h"
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#include "llvm/ADT/DenseMap.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-insert-nops"
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#define PASS_NAME "SI Insert Nops"
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namespace {
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class SIInsertNops : public MachineFunctionPass {
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public:
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static char ID;
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SIInsertNops() : MachineFunctionPass(ID) { }
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const char *getPassName() const override { return PASS_NAME; }
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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(SIInsertNops, DEBUG_TYPE, PASS_NAME, false, false)
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char SIInsertNops::ID = 0;
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char &llvm::SIInsertNopsID = SIInsertNops::ID;
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FunctionPass *llvm::createSIInsertNopsPass() {
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return new SIInsertNops();
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}
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bool SIInsertNops::runOnMachineFunction(MachineFunction &MF) {
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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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}
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// Target instruction info.
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const SIInstrInfo *TII =
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static_cast<const SIInstrInfo*>(MF.getSubtarget().getInstrInfo());
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// Mapping from high level source statement line number to last corresponding
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// isa instruction.
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DenseMap<unsigned, MachineBasicBlock::iterator> LineToInst;
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// Insert nop instruction before first isa instruction of each high level
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// source statement and collect last isa instruction for each high level
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// source statement.
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for (auto MBB = MF.begin(); MBB != MF.end(); ++MBB) {
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for (auto MI = MBB->begin(); MI != MBB->end(); ++MI) {
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if (MI->isDebugValue() || !MI->getDebugLoc()) {
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continue;
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}
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auto DL = MI->getDebugLoc();
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auto CL = DL.getLine();
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auto LineToInstEntry = LineToInst.find(CL);
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if (LineToInstEntry == LineToInst.end()) {
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BuildMI(*MBB, *MI, DL, TII->get(AMDGPU::S_NOP))
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.addImm(0);
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LineToInst.insert(std::make_pair(CL, MI));
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} else {
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LineToInstEntry->second = MI;
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}
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}
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}
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// Insert nop instruction after last isa instruction of each high level source
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// statement.
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for (auto LineToInstEntry = LineToInst.begin();
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LineToInstEntry != LineToInst.end(); ++LineToInstEntry) {
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auto MBB = LineToInstEntry->second->getParent();
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auto DL = LineToInstEntry->second->getDebugLoc();
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MachineBasicBlock::iterator MI = LineToInstEntry->second;
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++MI;
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if (MI != MBB->end()) {
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BuildMI(*MBB, *MI, DL, TII->get(AMDGPU::S_NOP))
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.addImm(0);
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}
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}
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// Insert nop instruction before prologue.
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MachineBasicBlock &MBB = MF.front();
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MachineInstr &MI = MBB.front();
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BuildMI(MBB, MI, DebugLoc(), TII->get(AMDGPU::S_NOP))
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.addImm(0);
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return true;
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}
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