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author | Stephen Hines <srhines@google.com> | 2014-04-23 16:57:46 -0700 |
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committer | Stephen Hines <srhines@google.com> | 2014-04-24 15:53:16 -0700 |
commit | 36b56886974eae4f9c5ebc96befd3e7bfe5de338 (patch) | |
tree | e6cfb69fbbd937f450eeb83bfb83b9da3b01275a /lib/CodeGen/StackMapLivenessAnalysis.cpp | |
parent | 69a8640022b04415ae9fac62f8ab090601d8f889 (diff) | |
download | external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.zip external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.tar.gz external_llvm-36b56886974eae4f9c5ebc96befd3e7bfe5de338.tar.bz2 |
Update to LLVM 3.5a.
Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
Diffstat (limited to 'lib/CodeGen/StackMapLivenessAnalysis.cpp')
-rw-r--r-- | lib/CodeGen/StackMapLivenessAnalysis.cpp | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/lib/CodeGen/StackMapLivenessAnalysis.cpp b/lib/CodeGen/StackMapLivenessAnalysis.cpp new file mode 100644 index 0000000..a374417 --- /dev/null +++ b/lib/CodeGen/StackMapLivenessAnalysis.cpp @@ -0,0 +1,128 @@ +//===-- 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. +// +//===----------------------------------------------------------------------===// + +#define DEBUG_TYPE "stackmaps" +#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; + +namespace llvm { +cl::opt<bool> EnableStackMapLiveness("enable-stackmap-liveness", + cl::Hidden, cl::desc("Enable StackMap Liveness Analysis Pass")); +cl::opt<bool> EnablePatchPointLiveness("enable-patchpoint-liveness", + cl::Hidden, 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) { + DEBUG(dbgs() << "********** COMPUTING STACKMAP LIVENESS: " + << _MF.getName() << " **********\n"); + MF = &_MF; + TRI = MF->getTarget().getRegisterInfo(); + ++NumStackMapFuncVisited; + + // Skip this function if there are no stackmaps or patchpoints to process. + if (!((MF->getFrameInfo()->hasStackMap() && EnableStackMapLiveness) || + (MF->getFrameInfo()->hasPatchPoint() && EnablePatchPointLiveness))) { + ++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 stackmap or patchpoint + // instruction. + for (MachineBasicBlock::reverse_iterator I = MBBI->rbegin(), + E = MBBI->rend(); I != E; ++I) { + int Opc = I->getOpcode(); + if ((EnableStackMapLiveness && (Opc == TargetOpcode::STACKMAP)) || + (EnablePatchPointLiveness && (Opc == TargetOpcode::PATCHPOINT))) { + addLiveOutSetToMI(*I); + HasChanged = true; + HasStackMap = true; + ++NumStackMaps; + } + DEBUG(dbgs() << " " << *I << " " << LiveRegs); + 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; +} |