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//===-- StackMapLivenessAnalysis.cpp - StackMap live Out Analysis ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the StackMap Liveness analysis pass. The pass calculates
// the liveness for each basic block in a function and attaches the register
// live-out information to a stackmap or patchpoint intrinsic if present.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionAnalysis.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/StackMapLivenessAnalysis.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
#define DEBUG_TYPE "stackmaps"
namespace llvm {
cl::opt<bool> EnablePatchPointLiveness("enable-patchpoint-liveness",
cl::Hidden, cl::init(true),
cl::desc("Enable PatchPoint Liveness Analysis Pass"));
}
STATISTIC(NumStackMapFuncVisited, "Number of functions visited");
STATISTIC(NumStackMapFuncSkipped, "Number of functions skipped");
STATISTIC(NumBBsVisited, "Number of basic blocks visited");
STATISTIC(NumBBsHaveNoStackmap, "Number of basic blocks with no stackmap");
STATISTIC(NumStackMaps, "Number of StackMaps visited");
char StackMapLiveness::ID = 0;
char &llvm::StackMapLivenessID = StackMapLiveness::ID;
INITIALIZE_PASS(StackMapLiveness, "stackmap-liveness",
"StackMap Liveness Analysis", false, false)
/// Default construct and initialize the pass.
StackMapLiveness::StackMapLiveness() : MachineFunctionPass(ID) {
initializeStackMapLivenessPass(*PassRegistry::getPassRegistry());
}
/// Tell the pass manager which passes we depend on and what information we
/// preserve.
void StackMapLiveness::getAnalysisUsage(AnalysisUsage &AU) const {
// We preserve all information.
AU.setPreservesAll();
AU.setPreservesCFG();
// Default dependencie for all MachineFunction passes.
AU.addRequired<MachineFunctionAnalysis>();
}
/// Calculate the liveness information for the given machine function.
bool StackMapLiveness::runOnMachineFunction(MachineFunction &_MF) {
if (!EnablePatchPointLiveness)
return false;
DEBUG(dbgs() << "********** COMPUTING STACKMAP LIVENESS: "
<< _MF.getName() << " **********\n");
MF = &_MF;
TRI = MF->getTarget().getRegisterInfo();
++NumStackMapFuncVisited;
// Skip this function if there are no patchpoints to process.
if (!MF->getFrameInfo()->hasPatchPoint()) {
++NumStackMapFuncSkipped;
return false;
}
return calculateLiveness();
}
/// Performs the actual liveness calculation for the function.
bool StackMapLiveness::calculateLiveness() {
bool HasChanged = false;
// For all basic blocks in the function.
for (MachineFunction::iterator MBBI = MF->begin(), MBBE = MF->end();
MBBI != MBBE; ++MBBI) {
DEBUG(dbgs() << "****** BB " << MBBI->getName() << " ******\n");
LiveRegs.init(TRI);
LiveRegs.addLiveOuts(MBBI);
bool HasStackMap = false;
// Reverse iterate over all instructions and add the current live register
// set to an instruction if we encounter a patchpoint instruction.
for (MachineBasicBlock::reverse_iterator I = MBBI->rbegin(),
E = MBBI->rend(); I != E; ++I) {
if (I->getOpcode() == TargetOpcode::PATCHPOINT) {
addLiveOutSetToMI(*I);
HasChanged = true;
HasStackMap = true;
++NumStackMaps;
}
DEBUG(dbgs() << " " << LiveRegs << " " << *I);
LiveRegs.stepBackward(*I);
}
++NumBBsVisited;
if (!HasStackMap)
++NumBBsHaveNoStackmap;
}
return HasChanged;
}
/// Add the current register live set to the instruction.
void StackMapLiveness::addLiveOutSetToMI(MachineInstr &MI) {
uint32_t *Mask = createRegisterMask();
MachineOperand MO = MachineOperand::CreateRegLiveOut(Mask);
MI.addOperand(*MF, MO);
}
/// Create a register mask and initialize it with the registers from the
/// register live set.
uint32_t *StackMapLiveness::createRegisterMask() const {
// The mask is owned and cleaned up by the Machine Function.
uint32_t *Mask = MF->allocateRegisterMask(TRI->getNumRegs());
for (LivePhysRegs::const_iterator RI = LiveRegs.begin(), RE = LiveRegs.end();
RI != RE; ++RI)
Mask[*RI / 32] |= 1U << (*RI % 32);
return Mask;
}
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