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