mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-21 03:53:04 +02:00
9465551fc2
This covers essentially all of llvm's headers and libs. One or two weird cases I wasn't sure were worth/appropriate to fix. llvm-svn: 232394
130 lines
4.6 KiB
C++
130 lines
4.6 KiB
C++
//===-- 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"
|
|
#include "llvm/Target/TargetSubtargetInfo.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");
|
|
this->MF = &MF;
|
|
TRI = MF.getSubtarget().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);
|
|
|
|
TRI->adjustStackMapLiveOutMask(Mask);
|
|
return Mask;
|
|
}
|