/// RegFixups - Registers which need to be replaced after isel is done.
DenseMap<unsigned, unsigned> RegFixups;
+ /// StatepointStackSlots - A list of temporary stack slots (frame indices)
+ /// used to spill values at a statepoint. We store them here to enable
+ /// reuse of the same stack slots across different statepoints in different
+ /// basic blocks.
+ SmallVector<unsigned, 50> StatepointStackSlots;
+
/// MBB - The current block.
MachineBasicBlock *MBB;
--- /dev/null
+//===-- llvm/IR/Statepoint.h - gc.statepoint utilities ------ --*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains utility functions and a wrapper class analogous to
+// CallSite for accessing the fields of gc.statepoint, gc.relocate, and
+// gc.result intrinsics
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_IR_STATEPOINT_H
+#define __LLVM_IR_STATEPOINT_H
+
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/Support/Compiler.h"
+
+namespace llvm {
+
+bool isStatepoint(const ImmutableCallSite &CS);
+bool isStatepoint(const Instruction *inst);
+bool isStatepoint(const Instruction &inst);
+
+bool isGCRelocate(const Instruction *inst);
+bool isGCRelocate(const ImmutableCallSite &CS);
+
+bool isGCResult(const Instruction *inst);
+bool isGCResult(const ImmutableCallSite &CS);
+
+/// Analogous to CallSiteBase, this provides most of the actual
+/// functionality for Statepoint and ImmutableStatepoint. It is
+/// templatized to allow easily specializing of const and non-const
+/// concrete subtypes. This is structured analogous to CallSite
+/// rather than the IntrinsicInst.h helpers since we want to support
+/// invokable statepoints in the near future.
+/// TODO: This does not currently allow the if(Statepoint S = ...)
+/// idiom used with CallSites. Consider refactoring to support.
+template <typename InstructionTy, typename ValueTy, typename CallSiteTy>
+class StatepointBase {
+ CallSiteTy StatepointCS;
+ void *operator new(size_t, unsigned) LLVM_DELETED_FUNCTION;
+ void *operator new(size_t s) LLVM_DELETED_FUNCTION;
+
+ protected:
+ explicit StatepointBase(InstructionTy *I) : StatepointCS(I) {
+ assert(isStatepoint(I));
+ }
+ explicit StatepointBase(CallSiteTy CS) : StatepointCS(CS) {
+ assert(isStatepoint(CS));
+ }
+
+ public:
+ typedef typename CallSiteTy::arg_iterator arg_iterator;
+
+ /// Return the underlying CallSite.
+ CallSiteTy getCallSite() {
+ return StatepointCS;
+ }
+
+ /// Return the value actually being called or invoked.
+ ValueTy *actualCallee() {
+ return StatepointCS.getArgument(0);
+ }
+ /// Number of arguments to be passed to the actual callee.
+ int numCallArgs() {
+ return cast<ConstantInt>(StatepointCS.getArgument(1))->getZExtValue();
+ }
+ /// Number of additional arguments excluding those intended
+ /// for garbage collection.
+ int numTotalVMSArgs() {
+ return cast<ConstantInt>(StatepointCS.getArgument(3 + numCallArgs()))->getZExtValue();
+ }
+
+ typename CallSiteTy::arg_iterator call_args_begin() {
+ // 3 = callTarget, #callArgs, flag
+ int Offset = 3;
+ assert(Offset <= (int)StatepointCS.arg_size());
+ return StatepointCS.arg_begin() + Offset;
+ }
+ typename CallSiteTy::arg_iterator call_args_end() {
+ int Offset = 3 + numCallArgs();
+ assert(Offset <= (int)StatepointCS.arg_size());
+ return StatepointCS.arg_begin() + Offset;
+ }
+
+ /// range adapter for call arguments
+ iterator_range<arg_iterator> call_args() {
+ return iterator_range<arg_iterator>(call_args_begin(), call_args_end());
+ }
+
+ typename CallSiteTy::arg_iterator vm_state_begin() {
+ return call_args_end();
+ }
+ typename CallSiteTy::arg_iterator vm_state_end() {
+ int Offset = 3 + numCallArgs() + 1 + numTotalVMSArgs();
+ assert(Offset <= (int)StatepointCS.arg_size());
+ return StatepointCS.arg_begin() + Offset;
+ }
+
+ /// range adapter for vm state arguments
+ iterator_range<arg_iterator> vm_state_args() {
+ return iterator_range<arg_iterator>(vm_state_begin(), vm_state_end());
+ }
+
+ typename CallSiteTy::arg_iterator first_vm_state_stack_begin() {
+ // 6 = numTotalVMSArgs, 1st_objectID, 1st_bci,
+ // 1st_#stack, 1st_#local, 1st_#monitor
+ return vm_state_begin() + 6;
+ }
+
+ typename CallSiteTy::arg_iterator gc_args_begin() {
+ return vm_state_end();
+ }
+ typename CallSiteTy::arg_iterator gc_args_end() {
+ return StatepointCS.arg_end();
+ }
+
+ /// range adapter for gc arguments
+ iterator_range<arg_iterator> gc_args() {
+ return iterator_range<arg_iterator>(gc_args_begin(), gc_args_end());
+ }
+
+
+#ifndef NDEBUG
+ void verify() {
+ // The internal asserts in the iterator accessors do the rest.
+ (void)call_args_begin();
+ (void)call_args_end();
+ (void)vm_state_begin();
+ (void)vm_state_end();
+ (void)gc_args_begin();
+ (void)gc_args_end();
+ }
+#endif
+};
+
+/// A specialization of it's base class for read only access
+/// to a gc.statepoint.
+class ImmutableStatepoint
+ : public StatepointBase<const Instruction, const Value,
+ ImmutableCallSite> {
+ typedef StatepointBase<const Instruction, const Value, ImmutableCallSite>
+ Base;
+
+public:
+ explicit ImmutableStatepoint(const Instruction *I) : Base(I) {}
+ explicit ImmutableStatepoint(ImmutableCallSite CS) : Base(CS) {}
+};
+
+/// A specialization of it's base class for read-write access
+/// to a gc.statepoint.
+class Statepoint : public StatepointBase<Instruction, Value, CallSite> {
+ typedef StatepointBase<Instruction, Value, CallSite> Base;
+
+public:
+ explicit Statepoint(Instruction *I) : Base(I) {}
+ explicit Statepoint(CallSite CS) : Base(CS) {}
+};
+
+/// Wraps a call to a gc.relocate and provides access to it's operands.
+/// TODO: This should likely be refactored to resememble the wrappers in
+/// InstrinsicInst.h.
+class GCRelocateOperands {
+ ImmutableCallSite RelocateCS;
+
+ public:
+ GCRelocateOperands(const User* U)
+ : GCRelocateOperands(cast<Instruction>(U)) {}
+ GCRelocateOperands(const Instruction *inst) : RelocateCS(inst) {
+ assert(isGCRelocate(inst));
+ }
+ GCRelocateOperands(CallSite CS) : RelocateCS(CS) {
+ assert(isGCRelocate(CS));
+ }
+
+ /// The statepoint with which this gc.relocate is associated.
+ const Instruction *statepoint() {
+ return cast<Instruction>(RelocateCS.getArgument(0));
+ }
+ /// The index into the associate statepoint's argument list
+ /// which contains the base pointer of the pointer whose
+ /// relocation this gc.relocate describes.
+ int basePtrIndex() {
+ return cast<ConstantInt>(RelocateCS.getArgument(1))->getZExtValue();
+ }
+ /// The index into the associate statepoint's argument list which
+ /// contains the pointer whose relocation this gc.relocate describes.
+ int derivedPtrIndex() {
+ return cast<ConstantInt>(RelocateCS.getArgument(2))->getZExtValue();
+ }
+ const Value *basePtr() {
+ ImmutableCallSite CS(statepoint());
+ return *(CS.arg_begin() + basePtrIndex());
+ }
+ const Value *derivedPtr() {
+ ImmutableCallSite CS(statepoint());
+ return *(CS.arg_begin() + derivedPtrIndex());
+ }
+};
+}
+#endif
SelectionDAGDumper.cpp
SelectionDAGISel.cpp
SelectionDAGPrinter.cpp
+ StatepointLowering.cpp
ScheduleDAGVLIW.cpp
TargetLowering.cpp
TargetSelectionDAGInfo.cpp
ArgDbgValues.clear();
ByValArgFrameIndexMap.clear();
RegFixups.clear();
+ StatepointStackSlots.clear();
PreferredExtendType.clear();
}
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
+#include "llvm/IR/Statepoint.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
CurInst = nullptr;
HasTailCall = false;
SDNodeOrder = LowestSDNodeOrder;
+ StatepointLowering.clear();
}
/// clearDanglingDebugInfo - Clear the dangling debug information
visitPatchpoint(&I);
return nullptr;
}
+ case Intrinsic::experimental_gc_statepoint: {
+ visitStatepoint(I);
+ return nullptr;
+ }
+ case Intrinsic::experimental_gc_result_int:
+ case Intrinsic::experimental_gc_result_float:
+ case Intrinsic::experimental_gc_result_ptr: {
+ visitGCResult(I);
+ return nullptr;
+ }
+ case Intrinsic::experimental_gc_relocate: {
+ visitGCRelocate(I);
+ return nullptr;
+ }
}
}
#include "llvm/IR/Constants.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetLowering.h"
+#include "StatepointLowering.h"
#include <vector>
namespace llvm {
/// get simple disambiguation between loads without worrying about alias
/// analysis.
SmallVector<SDValue, 8> PendingLoads;
+
+ /// State used while lowering a statepoint sequence (gc_statepoint,
+ /// gc_relocate, and gc_result). See StatepointLowering.hpp/cpp for details.
+ StatepointLoweringState StatepointLowering;
private:
/// PendingExports - CopyToReg nodes that copy values to virtual registers
N = NewN;
}
+ void removeValue(const Value *V) {
+ // This is to support hack in lowerCallFromStatepoint
+ // Should be removed when hack is resolved
+ if (NodeMap.count(V))
+ NodeMap.erase(V);
+ }
+
void setUnusedArgValue(const Value *V, SDValue NewN) {
SDValue &N = UnusedArgNodeMap[V];
assert(!N.getNode() && "Already set a value for this node!");
void visitPatchpoint(ImmutableCallSite CS,
MachineBasicBlock *LandingPad = nullptr);
+ // These three are implemented in StatepointLowering.cpp
+ void visitStatepoint(const CallInst &I);
+ void visitGCRelocate(const CallInst &I);
+ void visitGCResult(const CallInst &I);
+
void visitUserOp1(const Instruction &I) {
llvm_unreachable("UserOp1 should not exist at instruction selection time!");
}
--- /dev/null
+//===-- StatepointLowering.cpp - SDAGBuilder's statepoint code -----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file includes support code use by SelectionDAGBuilder when lowering a
+// statepoint sequence in SelectionDAG IR.
+//
+//===----------------------------------------------------------------------===//
+
+#include "StatepointLowering.h"
+#include "SelectionDAGBuilder.h"
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/CodeGen/FunctionLoweringInfo.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/CodeGen/StackMaps.h"
+#include "llvm/IR/CallingConv.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/Statepoint.h"
+#include "llvm/Target/TargetLowering.h"
+#include <algorithm>
+using namespace llvm;
+
+#define DEBUG_TYPE "statepoint-lowering"
+
+STATISTIC(NumSlotsAllocatedForStatepoints,
+ "Number of stack slots allocated for statepoints");
+STATISTIC(NumOfStatepoints, "Number of statepoint nodes encountered");
+STATISTIC(StatepointMaxSlotsRequired,
+ "Maximum number of stack slots required for a singe statepoint");
+
+void
+StatepointLoweringState::startNewStatepoint(SelectionDAGBuilder &Builder) {
+ // Consistency check
+ assert(PendingGCRelocateCalls.empty() &&
+ "Trying to visit statepoint before finished processing previous one");
+ Locations.clear();
+ RelocLocations.clear();
+ NextSlotToAllocate = 0;
+ // Need to resize this on each safepoint - we need the two to stay in
+ // sync and the clear patterns of a SelectionDAGBuilder have no relation
+ // to FunctionLoweringInfo.
+ AllocatedStackSlots.resize(Builder.FuncInfo.StatepointStackSlots.size());
+ for (size_t i = 0; i < AllocatedStackSlots.size(); i++) {
+ AllocatedStackSlots[i] = false;
+ }
+}
+void StatepointLoweringState::clear() {
+ Locations.clear();
+ RelocLocations.clear();
+ AllocatedStackSlots.clear();
+ assert(PendingGCRelocateCalls.empty() &&
+ "cleared before statepoint sequence completed");
+}
+
+SDValue
+StatepointLoweringState::allocateStackSlot(EVT ValueType,
+ SelectionDAGBuilder &Builder) {
+
+ NumSlotsAllocatedForStatepoints++;
+
+ // The basic scheme here is to first look for a previously created stack slot
+ // which is not in use (accounting for the fact arbitrary slots may already
+ // be reserved), or to create a new stack slot and use it.
+
+ // If this doesn't succeed in 40000 iterations, something is seriously wrong
+ for (int i = 0; i < 40000; i++) {
+ assert(Builder.FuncInfo.StatepointStackSlots.size() ==
+ AllocatedStackSlots.size() &&
+ "broken invariant");
+ const size_t NumSlots = AllocatedStackSlots.size();
+ assert(NextSlotToAllocate <= NumSlots && "broken invariant");
+
+ if (NextSlotToAllocate >= NumSlots) {
+ assert(NextSlotToAllocate == NumSlots);
+ // record stats
+ if (NumSlots + 1 > StatepointMaxSlotsRequired) {
+ StatepointMaxSlotsRequired = NumSlots + 1;
+ }
+
+ SDValue SpillSlot = Builder.DAG.CreateStackTemporary(ValueType);
+ const unsigned FI = cast<FrameIndexSDNode>(SpillSlot)->getIndex();
+ Builder.FuncInfo.StatepointStackSlots.push_back(FI);
+ AllocatedStackSlots.push_back(true);
+ return SpillSlot;
+ }
+ if (!AllocatedStackSlots[NextSlotToAllocate]) {
+ const int FI = Builder.FuncInfo.StatepointStackSlots[NextSlotToAllocate];
+ AllocatedStackSlots[NextSlotToAllocate] = true;
+ return Builder.DAG.getFrameIndex(FI, ValueType);
+ }
+ // Note: We deliberately choose to advance this only on the failing path.
+ // Doing so on the suceeding path involes a bit of complexity that caused a
+ // minor bug previously. Unless performance shows this matters, please
+ // keep this code as simple as possible.
+ NextSlotToAllocate++;
+ }
+ llvm_unreachable("infinite loop?");
+}
+
+/// Try to find existing copies of the incoming values in stack slots used for
+/// statepoint spilling. If we can find a spill slot for the incoming value,
+/// mark that slot as allocated, and reuse the same slot for this safepoint.
+/// This helps to avoid series of loads and stores that only serve to resuffle
+/// values on the stack between calls.
+static void reservePreviousStackSlotForValue(SDValue Incoming,
+ SelectionDAGBuilder &Builder) {
+
+ if (isa<ConstantSDNode>(Incoming) || isa<FrameIndexSDNode>(Incoming)) {
+ // We won't need to spill this, so no need to check for previously
+ // allocated stack slots
+ return;
+ }
+
+ SDValue Loc = Builder.StatepointLowering.getLocation(Incoming);
+ if (Loc.getNode()) {
+ // duplicates in input
+ return;
+ }
+
+ // Search back for the load from a stack slot pattern to find the original
+ // slot we allocated for this value. We could extend this to deal with
+ // simple modification patterns, but simple dealing with trivial load/store
+ // sequences helps a lot already.
+ if (LoadSDNode *Load = dyn_cast<LoadSDNode>(Incoming)) {
+ if (auto *FI = dyn_cast<FrameIndexSDNode>(Load->getBasePtr())) {
+ const int Index = FI->getIndex();
+ auto Itr = std::find(Builder.FuncInfo.StatepointStackSlots.begin(),
+ Builder.FuncInfo.StatepointStackSlots.end(), Index);
+ if (Itr == Builder.FuncInfo.StatepointStackSlots.end()) {
+ // not one of the lowering stack slots, can't reuse!
+ // TODO: Actually, we probably could reuse the stack slot if the value
+ // hasn't changed at all, but we'd need to look for intervening writes
+ return;
+ } else {
+ // This is one of our dedicated lowering slots
+ const int Offset =
+ std::distance(Builder.FuncInfo.StatepointStackSlots.begin(), Itr);
+ if (Builder.StatepointLowering.isStackSlotAllocated(Offset)) {
+ // stack slot already assigned to someone else, can't use it!
+ // TODO: currently we reserve space for gc arguments after doing
+ // normal allocation for deopt arguments. We should reserve for
+ // _all_ deopt and gc arguments, then start allocating. This
+ // will prevent some moves being inserted when vm state changes,
+ // but gc state doesn't between two calls.
+ return;
+ }
+ // Reserve this stack slot
+ Builder.StatepointLowering.reserveStackSlot(Offset);
+ }
+
+ // Cache this slot so we find it when going through the normal
+ // assignment loop.
+ SDValue Loc =
+ Builder.DAG.getTargetFrameIndex(Index, Incoming.getValueType());
+
+ Builder.StatepointLowering.setLocation(Incoming, Loc);
+ }
+ }
+
+ // TODO: handle case where a reloaded value flows through a phi to
+ // another safepoint. e.g.
+ // bb1:
+ // a' = relocated...
+ // bb2: % pred: bb1, bb3, bb4, etc.
+ // a_phi = phi(a', ...)
+ // statepoint ... a_phi
+ // NOTE: This will require reasoning about cross basic block values. This is
+ // decidedly non trivial and this might not be the right place to do it. We
+ // don't really have the information we need here...
+
+ // TODO: handle simple updates. If a value is modified and the original
+ // value is no longer live, it would be nice to put the modified value in the
+ // same slot. This allows folding of the memory accesses for some
+ // instructions types (like an increment).
+ // statepoint (i)
+ // i1 = i+1
+ // statepoint (i1)
+}
+
+/// Remove any duplicate (as SDValues) from the derived pointer pairs. This
+/// is not required for correctness. It's purpose is to reduce the size of
+/// StackMap section. It has no effect on the number of spill slots required
+/// or the actual lowering.
+static void removeDuplicatesGCPtrs(SmallVectorImpl<const Value *> &Bases,
+ SmallVectorImpl<const Value *> &Ptrs,
+ SmallVectorImpl<const Value *> &Relocs,
+ SelectionDAGBuilder &Builder) {
+
+ // This is horribly ineffecient, but I don't care right now
+ SmallSet<SDValue, 64> Seen;
+
+ SmallVector<const Value *, 64> NewBases, NewPtrs, NewRelocs;
+ for (size_t i = 0; i < Ptrs.size(); i++) {
+ SDValue SD = Builder.getValue(Ptrs[i]);
+ // Only add non-duplicates
+ if (Seen.count(SD) == 0) {
+ NewBases.push_back(Bases[i]);
+ NewPtrs.push_back(Ptrs[i]);
+ NewRelocs.push_back(Relocs[i]);
+ }
+ Seen.insert(SD);
+ }
+ assert(Bases.size() >= NewBases.size());
+ assert(Ptrs.size() >= NewPtrs.size());
+ assert(Relocs.size() >= NewRelocs.size());
+ Bases = NewBases;
+ Ptrs = NewPtrs;
+ Relocs = NewRelocs;
+ assert(Ptrs.size() == Bases.size());
+ assert(Ptrs.size() == Relocs.size());
+}
+
+/// Extract call from statepoint, lower it and return pointer to the
+/// call node. Also update NodeMap so that getValue(statepoint) will
+/// reference lowered call result
+static SDNode *lowerCallFromStatepoint(const CallInst &CI,
+ SelectionDAGBuilder &Builder) {
+
+ assert(Intrinsic::experimental_gc_statepoint ==
+ dyn_cast<IntrinsicInst>(&CI)->getIntrinsicID() &&
+ "function called must be the statepoint function");
+
+ int NumCallArgs = dyn_cast<ConstantInt>(CI.getArgOperand(1))->getZExtValue();
+ assert(NumCallArgs >= 0 && "non-negative");
+
+ ImmutableStatepoint StatepointOperands(&CI);
+
+ // Lower the actual call itself - This is a bit of a hack, but we want to
+ // avoid modifying the actual lowering code. This is similiar in intent to
+ // the LowerCallOperands mechanism used by PATCHPOINT, but is structured
+ // differently. Hopefully, this is slightly more robust w.r.t. calling
+ // convention, return values, and other function attributes.
+ Value *ActualCallee = const_cast<Value *>(StatepointOperands.actualCallee());
+#ifndef NDEBUG
+ StatepointOperands.verify();
+#endif
+
+ std::vector<Value *> Args;
+ CallInst::const_op_iterator arg_begin = StatepointOperands.call_args_begin();
+ CallInst::const_op_iterator arg_end = StatepointOperands.call_args_end();
+ Args.insert(Args.end(), arg_begin, arg_end);
+ // TODO: remove the creation of a new instruction! We should not be
+ // modifying the IR (even temporarily) at this point.
+ CallInst *Tmp = CallInst::Create(ActualCallee, Args);
+ Tmp->setTailCall(CI.isTailCall());
+ Tmp->setCallingConv(CI.getCallingConv());
+ Tmp->setAttributes(CI.getAttributes());
+ Builder.LowerCallTo(Tmp, Builder.getValue(ActualCallee), false);
+
+ // Handle the return value of the call iff any.
+ const bool HasDef = !Tmp->getType()->isVoidTy();
+ if (HasDef) {
+ // The value of the statepoint itself will be the value of call itself.
+ // We'll replace the actually call node shortly. gc_result will grab
+ // this value.
+ Builder.setValue(&CI, Builder.getValue(Tmp));
+ } else {
+ // The token value is never used from here on, just generate a poison value
+ Builder.setValue(&CI, Builder.DAG.getIntPtrConstant(-1));
+ }
+ // Remove the fake entry we created so we don't have a hanging reference
+ // after we delete this node.
+ Builder.removeValue(Tmp);
+ delete Tmp;
+ Tmp = nullptr;
+
+ // Search for the call node
+ // The following code is essentially reverse engineering X86's
+ // LowerCallTo.
+ SDNode *CallNode = nullptr;
+
+ // We just emitted a call, so it should be last thing generated
+ SDValue Chain = Builder.DAG.getRoot();
+
+ // Find closest CALLSEQ_END walking back through lowered nodes if needed
+ SDNode *CallEnd = Chain.getNode();
+ int Sanity = 0;
+ while (CallEnd->getOpcode() != ISD::CALLSEQ_END) {
+ CallEnd = CallEnd->getGluedNode();
+ assert(CallEnd && "Can not find call node");
+ assert(Sanity < 20 && "should have found call end already");
+ Sanity++;
+ }
+ assert(CallEnd->getOpcode() == ISD::CALLSEQ_END &&
+ "Expected a callseq node.");
+ assert(CallEnd->getGluedNode());
+
+ // Step back inside the CALLSEQ
+ CallNode = CallEnd->getGluedNode();
+ return CallNode;
+}
+
+/// Callect all gc pointers coming into statepoint intrinsic, clean them up,
+/// and return two arrays:
+/// Bases - base pointers incoming to this statepoint
+/// Ptrs - derived pointers incoming to this statepoint
+/// Relocs - the gc_relocate corresponding to each base/ptr pair
+/// Elements of this arrays should be in one-to-one correspondence with each
+/// other i.e Bases[i], Ptrs[i] are from the same gcrelocate call
+static void
+getIncomingStatepointGCValues(SmallVectorImpl<const Value *> &Bases,
+ SmallVectorImpl<const Value *> &Ptrs,
+ SmallVectorImpl<const Value *> &Relocs,
+ ImmutableCallSite Statepoint,
+ SelectionDAGBuilder &Builder) {
+ // Search for relocated pointers. Note that working backwards from the
+ // gc_relocates ensures that we only get pairs which are actually relocated
+ // and used after the statepoint.
+ // TODO: This logic should probably become a utility function in Statepoint.h
+ for (const User *U : cast<CallInst>(Statepoint.getInstruction())->users()) {
+ if (!isGCRelocate(U)) {
+ continue;
+ }
+ GCRelocateOperands relocateOpers(U);
+ Relocs.push_back(cast<Value>(U));
+ Bases.push_back(relocateOpers.basePtr());
+ Ptrs.push_back(relocateOpers.derivedPtr());
+ }
+
+ // Remove any redundant llvm::Values which map to the same SDValue as another
+ // input. Also has the effect of removing duplicates in the original
+ // llvm::Value input list as well. This is a useful optimization for
+ // reducing the size of the StackMap section. It has no other impact.
+ removeDuplicatesGCPtrs(Bases, Ptrs, Relocs, Builder);
+
+ assert(Bases.size() == Ptrs.size() && Ptrs.size() == Relocs.size());
+}
+
+/// Spill a value incoming to the statepoint. It might be either part of
+/// vmstate
+/// or gcstate. In both cases unconditionally spill it on the stack unless it
+/// is a null constant. Return pair with first element being frame index
+/// containing saved value and second element with outgoing chain from the
+/// emitted store
+static std::pair<SDValue, SDValue>
+spillIncomingStatepointValue(SDValue Incoming, SDValue Chain,
+ SelectionDAGBuilder &Builder) {
+ SDValue Loc = Builder.StatepointLowering.getLocation(Incoming);
+
+ // Emit new store if we didn't do it for this ptr before
+ if (!Loc.getNode()) {
+ Loc = Builder.StatepointLowering.allocateStackSlot(Incoming.getValueType(),
+ Builder);
+ assert(isa<FrameIndexSDNode>(Loc));
+ int Index = cast<FrameIndexSDNode>(Loc)->getIndex();
+ // We use TargetFrameIndex so that isel will not select it into LEA
+ Loc = Builder.DAG.getTargetFrameIndex(Index, Incoming.getValueType());
+
+ // TODO: We can create TokenFactor node instead of
+ // chaining stores one after another, this may allow
+ // a bit more optimal scheduling for them
+ Chain = Builder.DAG.getStore(Chain, Builder.getCurSDLoc(), Incoming, Loc,
+ MachinePointerInfo::getFixedStack(Index),
+ false, false, 0);
+
+ Builder.StatepointLowering.setLocation(Incoming, Loc);
+ }
+
+ assert(Loc.getNode());
+ return std::make_pair(Loc, Chain);
+}
+
+/// Lower a single value incoming to a statepoint node. This value can be
+/// either a deopt value or a gc value, the handling is the same. We special
+/// case constants and allocas, then fall back to spilling if required.
+static void lowerIncomingStatepointValue(SDValue Incoming,
+ SmallVectorImpl<SDValue> &Ops,
+ SelectionDAGBuilder &Builder) {
+ SDValue Chain = Builder.getRoot();
+
+ if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Incoming)) {
+ // If the original value was a constant, make sure it gets recorded as
+ // such in the stackmap. This is required so that the consumer can
+ // parse any internal format to the deopt state. It also handles null
+ // pointers and other constant pointers in GC states
+ Ops.push_back(
+ Builder.DAG.getTargetConstant(StackMaps::ConstantOp, MVT::i64));
+ Ops.push_back(Builder.DAG.getTargetConstant(C->getSExtValue(), MVT::i64));
+ } else if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Incoming)) {
+ // This handles allocas as arguments to the statepoint
+ const TargetLowering &TLI = Builder.DAG.getTargetLoweringInfo();
+ Ops.push_back(
+ Builder.DAG.getTargetFrameIndex(FI->getIndex(), TLI.getPointerTy()));
+ } else {
+ // Otherwise, locate a spill slot and explicitly spill it so it
+ // can be found by the runtime later. We currently do not support
+ // tracking values through callee saved registers to their eventual
+ // spill location. This would be a useful optimization, but would
+ // need to be optional since it requires a lot of complexity on the
+ // runtime side which not all would support.
+ std::pair<SDValue, SDValue> Res =
+ spillIncomingStatepointValue(Incoming, Chain, Builder);
+ Ops.push_back(Res.first);
+ Chain = Res.second;
+ }
+
+ Builder.DAG.setRoot(Chain);
+}
+
+/// Lower deopt state and gc pointer arguments of the statepoint. The actual
+/// lowering is described in lowerIncomingStatepointValue. This function is
+/// responsible for lowering everything in the right position and playing some
+/// tricks to avoid redundant stack manipulation where possible. On
+/// completion, 'Ops' will contain ready to use operands for machine code
+/// statepoint. The chain nodes will have already been created and the DAG root
+/// will be set to the last value spilled (if any were).
+static void lowerStatepointMetaArgs(SmallVectorImpl<SDValue> &Ops,
+ ImmutableStatepoint Statepoint,
+ SelectionDAGBuilder &Builder) {
+
+ // Lower the deopt and gc arguments for this statepoint. Layout will
+ // be: deopt argument length, deopt arguments.., gc arguments...
+
+ SmallVector<const Value *, 64> Bases, Ptrs, Relocations;
+ getIncomingStatepointGCValues(Bases, Ptrs, Relocations,
+ Statepoint.getCallSite(), Builder);
+
+ // Before we actually start lowering (and allocating spill slots for values),
+ // reserve any stack slots which we judge to be profitable to reuse for a
+ // particular value. This is purely an optimization over the code below and
+ // doesn't change semantics at all. It is important for performance that we
+ // reserve slots for both deopt and gc values before lowering either.
+ for (auto I = Statepoint.vm_state_begin() + 1, E = Statepoint.vm_state_end();
+ I != E; ++I) {
+ Value *V = *I;
+ SDValue Incoming = Builder.getValue(V);
+ reservePreviousStackSlotForValue(Incoming, Builder);
+ }
+ for (unsigned i = 0; i < Bases.size() * 2; ++i) {
+ // Even elements will contain base, odd elements - derived ptr
+ const Value *V = i % 2 ? Bases[i / 2] : Ptrs[i / 2];
+ SDValue Incoming = Builder.getValue(V);
+ reservePreviousStackSlotForValue(Incoming, Builder);
+ }
+
+ // First, prefix the list with the number of unique values to be
+ // lowered. Note that this is the number of *Values* not the
+ // number of SDValues required to lower them.
+ const int NumVMSArgs = Statepoint.numTotalVMSArgs();
+ Ops.push_back(
+ Builder.DAG.getTargetConstant(StackMaps::ConstantOp, MVT::i64));
+ Ops.push_back(Builder.DAG.getTargetConstant(NumVMSArgs, MVT::i64));
+
+ assert(NumVMSArgs + 1 == std::distance(Statepoint.vm_state_begin(),
+ Statepoint.vm_state_end()));
+
+ // The vm state arguments are lowered in an opaque manner. We do
+ // not know what type of values are contained within. We skip the
+ // first one since that happens to be the total number we lowered
+ // explicitly just above. We could have left it in the loop and
+ // not done it explicitly, but it's far easier to understand this
+ // way.
+ for (auto I = Statepoint.vm_state_begin() + 1, E = Statepoint.vm_state_end();
+ I != E; ++I) {
+ const Value *V = *I;
+ SDValue Incoming = Builder.getValue(V);
+ lowerIncomingStatepointValue(Incoming, Ops, Builder);
+ }
+
+ // Finally, go ahead and lower all the gc arguments. There's no prefixed
+ // length for this one. After lowering, we'll have the base and pointer
+ // arrays interwoven with each (lowered) base pointer immediately followed by
+ // it's (lowered) derived pointer. i.e
+ // (base[0], ptr[0], base[1], ptr[1], ...)
+ for (unsigned i = 0; i < Bases.size() * 2; ++i) {
+ // Even elements will contain base, odd elements - derived ptr
+ const Value *V = i % 2 ? Bases[i / 2] : Ptrs[i / 2];
+ SDValue Incoming = Builder.getValue(V);
+ lowerIncomingStatepointValue(Incoming, Ops, Builder);
+ }
+}
+void SelectionDAGBuilder::visitStatepoint(const CallInst &CI) {
+ // The basic scheme here is that information about both the original call and
+ // the safepoint is encoded in the CallInst. We create a temporary call and
+ // lower it, then reverse engineer the calling sequence.
+
+ // Check some preconditions for sanity
+ assert(isStatepoint(&CI) &&
+ "function called must be the statepoint function");
+ NumOfStatepoints++;
+ // Clear state
+ StatepointLowering.startNewStatepoint(*this);
+
+#ifndef NDEBUG
+ // Consistency check
+ for (const User *U : CI.users()) {
+ const CallInst *Call = cast<CallInst>(U);
+ if (isGCRelocate(Call))
+ StatepointLowering.scheduleRelocCall(*Call);
+ }
+#endif
+
+ ImmutableStatepoint ISP(&CI);
+
+ // Lower statepoint vmstate and gcstate arguments
+ SmallVector<SDValue, 10> LoweredArgs;
+ lowerStatepointMetaArgs(LoweredArgs, ISP, *this);
+
+ // Get call node, we will replace it later with statepoint
+ SDNode *CallNode = lowerCallFromStatepoint(CI, *this);
+
+ // Construct the actual STATEPOINT node with all the appropriate arguments
+ // and return values.
+
+ // TODO: Currently, all of these operands are being marked as read/write in
+ // PrologEpilougeInserter.cpp, we should special case the VMState arguments
+ // and flags to be read-only.
+ SmallVector<SDValue, 40> Ops;
+
+ // Calculate and push starting position of vmstate arguments
+ // Call Node: Chain, Target, {Args}, RegMask, [Glue]
+ SDValue Glue;
+ if (CallNode->getGluedNode()) {
+ // Glue is always last operand
+ Glue = CallNode->getOperand(CallNode->getNumOperands() - 1);
+ }
+ // Get number of arguments incoming directly into call node
+ unsigned NumCallRegArgs =
+ CallNode->getNumOperands() - (Glue.getNode() ? 4 : 3);
+ Ops.push_back(DAG.getTargetConstant(NumCallRegArgs, MVT::i32));
+
+ // Add call target
+ SDValue CallTarget = SDValue(CallNode->getOperand(1).getNode(), 0);
+ Ops.push_back(CallTarget);
+
+ // Add call arguments
+ // Get position of register mask in the call
+ SDNode::op_iterator RegMaskIt;
+ if (Glue.getNode())
+ RegMaskIt = CallNode->op_end() - 2;
+ else
+ RegMaskIt = CallNode->op_end() - 1;
+ Ops.insert(Ops.end(), CallNode->op_begin() + 2, RegMaskIt);
+
+ // Add a leading constant argument with the Flags and the calling convention
+ // masked together
+ CallingConv::ID CallConv = CI.getCallingConv();
+ int Flags = dyn_cast<ConstantInt>(CI.getArgOperand(2))->getZExtValue();
+ assert(Flags == 0 && "not expected to be used");
+ Ops.push_back(DAG.getTargetConstant(StackMaps::ConstantOp, MVT::i64));
+ Ops.push_back(
+ DAG.getTargetConstant(Flags | ((unsigned)CallConv << 1), MVT::i64));
+
+ // Insert all vmstate and gcstate arguments
+ Ops.insert(Ops.end(), LoweredArgs.begin(), LoweredArgs.end());
+
+ // Add register mask from call node
+ Ops.push_back(*RegMaskIt);
+
+ // Add chain
+ Ops.push_back(CallNode->getOperand(0));
+
+ // Same for the glue, but we add it only if original call had it
+ if (Glue.getNode())
+ Ops.push_back(Glue);
+
+ // Compute return values
+ SmallVector<EVT, 21> ValueVTs;
+ ValueVTs.push_back(MVT::Other);
+ ValueVTs.push_back(MVT::Glue); // provide a glue output since we consume one
+ // as input. This allows someone else to chain
+ // off us as needed.
+ SDVTList NodeTys = DAG.getVTList(ValueVTs);
+
+ SDNode *StatepointMCNode = DAG.getMachineNode(TargetOpcode::STATEPOINT,
+ getCurSDLoc(), NodeTys, Ops);
+
+ // Replace original call
+ DAG.ReplaceAllUsesWith(CallNode, StatepointMCNode); // This may update Root
+ // Remove originall call node
+ DAG.DeleteNode(CallNode);
+
+ // DON'T set the root - under the assumption that it's already set past the
+ // inserted node we created.
+
+ // TODO: A better future implementation would be to emit a single variable
+ // argument, variable return value STATEPOINT node here and then hookup the
+ // return value of each gc.relocate to the respective output of the
+ // previously emitted STATEPOINT value. Unfortunately, this doesn't appear
+ // to actually be possible today.
+}
+
+void SelectionDAGBuilder::visitGCResult(const CallInst &CI) {
+ // The result value of the gc_result is simply the result of the actual
+ // call. We've already emitted this, so just grab the value.
+ Instruction *I = cast<Instruction>(CI.getArgOperand(0));
+ assert(isStatepoint(I) &&
+ "first argument must be a statepoint token");
+
+ setValue(&CI, getValue(I));
+}
+
+void SelectionDAGBuilder::visitGCRelocate(const CallInst &CI) {
+#ifndef NDEBUG
+ // Consistency check
+ StatepointLowering.relocCallVisited(CI);
+#endif
+
+ GCRelocateOperands relocateOpers(&CI);
+ SDValue SD = getValue(relocateOpers.derivedPtr());
+
+ if (isa<ConstantSDNode>(SD) || isa<FrameIndexSDNode>(SD)) {
+ // We didn't need to spill these special cases (constants and allocas).
+ // See the handling in spillIncomingValueForStatepoint for detail.
+ setValue(&CI, SD);
+ return;
+ }
+
+ SDValue Loc = StatepointLowering.getRelocLocation(SD);
+ // Emit new load if we did not emit it before
+ if (!Loc.getNode()) {
+ SDValue SpillSlot = StatepointLowering.getLocation(SD);
+ int FI = cast<FrameIndexSDNode>(SpillSlot)->getIndex();
+
+ // Be conservative: flush all pending loads
+ // TODO: Probably we can be less restrictive on this,
+ // it may allow more scheduling opprtunities
+ SDValue Chain = getRoot();
+
+ Loc = DAG.getLoad(SpillSlot.getValueType(), getCurSDLoc(), Chain,
+ SpillSlot, MachinePointerInfo::getFixedStack(FI), false,
+ false, false, 0);
+
+ StatepointLowering.setRelocLocation(SD, Loc);
+
+ // Again, be conservative, don't emit pending loads
+ DAG.setRoot(Loc.getValue(1));
+ }
+
+ assert(Loc.getNode());
+ setValue(&CI, Loc);
+}
--- /dev/null
+//===-- StatepointLowering.h - SDAGBuilder's statepoint code -*- C++ -*---===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file includes support code use by SelectionDAGBuilder when lowering a
+// statepoint sequence in SelectionDAG IR.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_SELECTIONDAG_STATEPOINTLOWERING_H
+#define LLVM_LIB_CODEGEN_SELECTIONDAG_STATEPOINTLOWERING_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/CodeGen/SelectionDAGNodes.h"
+#include <vector>
+
+namespace llvm {
+class SelectionDAGBuilder;
+
+/// This class tracks both per-statepoint and per-selectiondag information.
+/// For each statepoint it tracks locations of it's gc valuess (incoming and
+/// relocated) and list of gcreloc calls scheduled for visiting (this is
+/// used for a debug mode consistency check only). The spill slot tracking
+/// works in concert with information in FunctionLoweringInfo.
+class StatepointLoweringState {
+public:
+ StatepointLoweringState() : NextSlotToAllocate(0) {
+ }
+
+ /// Reset all state tracking for a newly encountered safepoint. Also
+ /// performs some consistency checking.
+ void startNewStatepoint(SelectionDAGBuilder &Builder);
+
+ /// Clear the memory usage of this object. This is called from
+ /// SelectionDAGBuilder::clear. We require this is never called in the
+ /// midst of processing a statepoint sequence.
+ void clear();
+
+ /// Returns the spill location of a value incoming to the current
+ /// statepoint. Will return SDValue() if this value hasn't been
+ /// spilled. Otherwise, the value has already been spilled and no
+ /// further action is required by the caller.
+ SDValue getLocation(SDValue val) {
+ if (!Locations.count(val))
+ return SDValue();
+ return Locations[val];
+ }
+ void setLocation(SDValue val, SDValue Location) {
+ assert(!Locations.count(val) &&
+ "Trying to allocate already allocated location");
+ Locations[val] = Location;
+ }
+
+ /// Returns the relocated value for a given input pointer. Will
+ /// return SDValue() if this value hasn't yet been reloaded from
+ /// it's stack slot after the statepoint. Otherwise, the value
+ /// has already been reloaded and the SDValue of that reload will
+ /// be returned. Note that VMState values are spilled but not
+ /// reloaded (since they don't change at the safepoint unless
+ /// also listed in the GC pointer section) and will thus never
+ /// be in this map
+ SDValue getRelocLocation(SDValue val) {
+ if (!RelocLocations.count(val))
+ return SDValue();
+ return RelocLocations[val];
+ }
+ void setRelocLocation(SDValue val, SDValue Location) {
+ assert(!RelocLocations.count(val) &&
+ "Trying to allocate already allocated location");
+ RelocLocations[val] = Location;
+ }
+
+ /// Record the fact that we expect to encounter a given gc_relocate
+ /// before the next statepoint. If we don't see it, we'll report
+ /// an assertion.
+ void scheduleRelocCall(const CallInst &RelocCall) {
+ PendingGCRelocateCalls.push_back(&RelocCall);
+ }
+ /// Remove this gc_relocate from the list we're expecting to see
+ /// before the next statepoint. If we weren't expecting to see
+ /// it, we'll report an assertion.
+ void relocCallVisited(const CallInst &RelocCall) {
+ SmallVectorImpl<const CallInst *>::iterator itr =
+ std::find(PendingGCRelocateCalls.begin(), PendingGCRelocateCalls.end(),
+ &RelocCall);
+ assert(itr != PendingGCRelocateCalls.end() &&
+ "Visited unexpected gcrelocate call");
+ PendingGCRelocateCalls.erase(itr);
+ }
+
+ // TODO: Should add consistency tracking to ensure we encounter
+ // expected gc_result calls too.
+
+ /// Get a stack slot we can use to store an value of type ValueType. This
+ /// will hopefully be a recylced slot from another statepoint.
+ SDValue allocateStackSlot(EVT ValueType, SelectionDAGBuilder &Builder);
+
+ void reserveStackSlot(int Offset) {
+ assert(Offset >= 0 && Offset < (int)AllocatedStackSlots.size() &&
+ "out of bounds");
+ assert(!AllocatedStackSlots[Offset] && "already reserved!");
+ assert(NextSlotToAllocate <= (unsigned)Offset && "consistency!");
+ AllocatedStackSlots[Offset] = true;
+ }
+ bool isStackSlotAllocated(int Offset) {
+ assert(Offset >= 0 && Offset < (int)AllocatedStackSlots.size() &&
+ "out of bounds");
+ return AllocatedStackSlots[Offset];
+ }
+
+private:
+ /// Maps pre-relocation value (gc pointer directly incoming into statepoint)
+ /// into it's location (currently only stack slots)
+ DenseMap<SDValue, SDValue> Locations;
+ /// Map pre-relocated value into it's new relocated location
+ DenseMap<SDValue, SDValue> RelocLocations;
+
+ /// A boolean indicator for each slot listed in the FunctionInfo as to
+ /// whether it has been used in the current statepoint. Since we try to
+ /// preserve stack slots across safepoints, there can be gaps in which
+ /// slots have been allocated.
+ SmallVector<bool, 50> AllocatedStackSlots;
+
+ /// Points just beyond the last slot known to have been allocated
+ unsigned NextSlotToAllocate;
+
+ /// Keep track of pending gcrelocate calls for consistency check
+ SmallVector<const CallInst *, 10> PendingGCRelocateCalls;
+};
+} // end namespace llvm
+
+#endif // LLVM_LIB_CODEGEN_SELECTIONDAG_STATEPOINTLOWERING_H
Pass.cpp
PassManager.cpp
PassRegistry.cpp
+ Statepoint.cpp
Type.cpp
TypeFinder.cpp
Use.cpp
--- /dev/null
+//===-- IR/Statepoint.cpp -- gc.statepoint utilities --- -----------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Constant.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/Support/CommandLine.h"
+
+#include "llvm/IR/Statepoint.h"
+
+using namespace std;
+using namespace llvm;
+
+bool llvm::isStatepoint(const ImmutableCallSite &CS) {
+ const Function *F = CS.getCalledFunction();
+ return (F && F->getIntrinsicID() == Intrinsic::experimental_gc_statepoint);
+}
+bool llvm::isStatepoint(const Instruction *inst) {
+ if (isa<InvokeInst>(inst) || isa<CallInst>(inst)) {
+ ImmutableCallSite CS(inst);
+ return isStatepoint(CS);
+ }
+ return false;
+}
+bool llvm::isStatepoint(const Instruction &inst) {
+ return isStatepoint(&inst);
+}
+
+bool llvm::isGCRelocate(const ImmutableCallSite &CS) {
+ return isGCRelocate(CS.getInstruction());
+}
+bool llvm::isGCRelocate(const Instruction *inst) {
+ if (const CallInst *call = dyn_cast<CallInst>(inst)) {
+ if (const Function *F = call->getCalledFunction()) {
+ return F->getIntrinsicID() == Intrinsic::experimental_gc_relocate;
+ }
+ }
+ return false;
+}
+
+bool llvm::isGCResult(const ImmutableCallSite &CS) {
+ return isGCResult(CS.getInstruction());
+}
+bool llvm::isGCResult(const Instruction *inst) {
+ if (const CallInst *call = cast<CallInst>(inst)) {
+ if (Function *F = call->getCalledFunction()) {
+ return (F->getIntrinsicID() == Intrinsic::experimental_gc_result_int ||
+ F->getIntrinsicID() == Intrinsic::experimental_gc_result_float ||
+ F->getIntrinsicID() == Intrinsic::experimental_gc_result_ptr);
+ }
+ }
+ return false;
+}
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/PatternMatch.h"
+#include "llvm/IR/Statepoint.h"
#include "llvm/Transforms/Utils/BuildLibCalls.h"
#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
if (!CI->isLosslessCast())
return false;
+ // If this is a GC intrinsic, avoid munging types. We need types for
+ // statepoint reconstruction in SelectionDAG.
+ // TODO: This is probably something which should be expanded to all
+ // intrinsics since the entire point of intrinsics is that
+ // they are understandable by the optimizer.
+ if (isStatepoint(CS) || isGCRelocate(CS) || isGCResult(CS))
+ return false;
+
// The size of ByVal or InAlloca arguments is derived from the type, so we
// can't change to a type with a different size. If the size were
// passed explicitly we could avoid this check.
--- /dev/null
+; RUN: llc < %s | FileCheck %s
+; This file contains a collection of basic tests to ensure we didn't
+; screw up normal call lowering when there are no deopt or gc arguments.
+
+target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-linux-gnu"
+
+declare zeroext i1 @return_i1()
+declare zeroext i32 @return_i32()
+declare i32* @return_i32ptr()
+declare float @return_float()
+
+define i1 @test_i1_return() {
+; CHECK-LABEL: test_i1_return
+; This is just checking that a i1 gets lowered normally when there's no extra
+; state arguments to the statepoint
+; CHECK: pushq %rax
+; CHECK: callq return_i1
+; CHECK: popq %rdx
+; CHECK: retq
+entry:
+ %safepoint_token = tail call i32 (i1 ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()* @return_i1, i32 0, i32 0, i32 0)
+ %call1 = call zeroext i1 @llvm.experimental.gc.result.int.i1(i32 %safepoint_token)
+ ret i1 %call1
+}
+
+define i32 @test_i32_return() {
+; CHECK-LABEL: test_i32_return
+; CHECK: pushq %rax
+; CHECK: callq return_i32
+; CHECK: popq %rdx
+; CHECK: retq
+entry:
+ %safepoint_token = tail call i32 (i32 ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_i32f(i32 ()* @return_i32, i32 0, i32 0, i32 0)
+ %call1 = call zeroext i32 @llvm.experimental.gc.result.int.i32(i32 %safepoint_token)
+ ret i32 %call1
+}
+
+define i32* @test_i32ptr_return() {
+; CHECK-LABEL: test_i32ptr_return
+; CHECK: pushq %rax
+; CHECK: callq return_i32ptr
+; CHECK: popq %rdx
+; CHECK: retq
+entry:
+ %safepoint_token = tail call i32 (i32* ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_p0i32f(i32* ()* @return_i32ptr, i32 0, i32 0, i32 0)
+ %call1 = call i32* @llvm.experimental.gc.result.ptr.p0i32(i32 %safepoint_token)
+ ret i32* %call1
+}
+
+define float @test_float_return() {
+; CHECK-LABEL: test_float_return
+; CHECK: pushq %rax
+; CHECK: callq return_float
+; CHECK: popq %rax
+; CHECK: retq
+entry:
+ %safepoint_token = tail call i32 (float ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_f32f(float ()* @return_float, i32 0, i32 0, i32 0)
+ %call1 = call float @llvm.experimental.gc.result.float.f32(i32 %safepoint_token)
+ ret float %call1
+}
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()*, i32, i32, ...)
+declare i1 @llvm.experimental.gc.result.int.i1(i32)
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_i32f(i32 ()*, i32, i32, ...)
+declare i32 @llvm.experimental.gc.result.int.i32(i32)
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_p0i32f(i32* ()*, i32, i32, ...)
+declare i32* @llvm.experimental.gc.result.ptr.p0i32(i32)
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_f32f(float ()*, i32, i32, ...)
+declare float @llvm.experimental.gc.result.float.f32(i32)
+
--- /dev/null
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-linux-gnu"
+
+; This test is checking to make sure that we reuse the same stack slots
+; for GC values spilled over two different call sites. Since the order
+; of GC arguments differ, niave lowering code would insert loads and
+; stores to rearrange items on the stack. We need to make sure (for
+; performance) that this doesn't happen.
+define i32 @back_to_back_calls(i32* %a, i32* %b, i32* %c) #1 {
+; CHECK-LABEL: back_to_back_calls
+; The exact stores don't matter, but there need to be three stack slots created
+; CHECK: movq %rdx, 16(%rsp)
+; CHECK: movq %rdi, 8(%rsp)
+; CHECK: movq %rsi, (%rsp)
+ %safepoint_token = tail call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* undef, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i32* %a, i32* %b, i32* %c)
+ %a1 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token, i32 9, i32 9)
+ %b1 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token, i32 9, i32 10)
+ %c1 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token, i32 9, i32 11)
+; CHECK: callq
+; This is the key check. There should NOT be any memory moves here
+; CHECK-NOT: movq
+ %safepoint_token2 = tail call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* undef, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i32* %c1, i32* %b1, i32* %a1)
+ %a2 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token2, i32 9, i32 11)
+ %b2 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token2, i32 9, i32 10)
+ %c2 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token2, i32 9, i32 9)
+; CHECK: callq
+ ret i32 1
+}
+
+; This test simply checks that minor changes in vm state don't prevent slots
+; being reused for gc values.
+define i32 @reserve_first(i32* %a, i32* %b, i32* %c) #1 {
+; CHECK-LABEL: reserve_first
+; The exact stores don't matter, but there need to be three stack slots created
+; CHECK: movq %rdx, 16(%rsp)
+; CHECK: movq %rdi, 8(%rsp)
+; CHECK: movq %rsi, (%rsp)
+ %safepoint_token = tail call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* undef, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i32* %a, i32* %b, i32* %c)
+ %a1 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token, i32 9, i32 9)
+ %b1 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token, i32 9, i32 10)
+ %c1 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token, i32 9, i32 11)
+; CHECK: callq
+; This is the key check. There should NOT be any memory moves here
+; CHECK-NOT: movq
+ %safepoint_token2 = tail call i32 (void ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* undef, i32 0, i32 0, i32 5, i32* %a1, i32 0, i32* %c1, i32 0, i32 0, i32* %c1, i32* %b1, i32* %a1)
+ %a2 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token2, i32 9, i32 11)
+ %b2 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token2, i32 9, i32 10)
+ %c2 = tail call coldcc i32* @llvm.experimental.gc.relocate.p0i32(i32 %safepoint_token2, i32 9, i32 9)
+; CHECK: callq
+ ret i32 1
+}
+
+; Function Attrs: nounwind
+declare i32* @llvm.experimental.gc.relocate.p0i32(i32, i32, i32) #3
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()*, i32, i32, ...)
+
+attributes #1 = { uwtable }
--- /dev/null
+; RUN: llc < %s | FileCheck %s
+; This test is a sanity check to ensure statepoints are generating StackMap
+; sections correctly. This is not intended to be a rigorous test of the
+; StackMap format (see the stackmap tests for that).
+
+target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-linux-gnu"
+
+declare zeroext i1 @return_i1()
+
+define i1 @test(i32 addrspace(1)* %ptr) {
+; CHECK-LABEL: test
+; Do we see one spill for the local value and the store to the
+; alloca?
+; CHECK: subq $24, %rsp
+; CHECK: movq $0, 8(%rsp)
+; CHECK: movq %rdi, (%rsp)
+; CHECK: callq return_i1
+; CHECK: addq $24, %rsp
+; CHECK: retq
+entry:
+ %metadata1 = alloca i32 addrspace(1)*, i32 2, align 8
+ store i32 addrspace(1)* null, i32 addrspace(1)** %metadata1
+; NOTE: Currently NOT testing alloca lowering in the StackMap format. Its
+; known to be broken.
+ %safepoint_token = tail call i32 (i1 ()*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()* @return_i1, i32 0, i32 0, i32 2, i32 addrspace(1)* %ptr, i32 addrspace(1)* null)
+ %call1 = call zeroext i1 @llvm.experimental.gc.result.int.i1(i32 %safepoint_token)
+ %a = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %safepoint_token, i32 4, i32 4)
+ %b = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %safepoint_token, i32 5, i32 5)
+;
+ ret i1 %call1
+}
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()*, i32, i32, ...)
+declare i1 @llvm.experimental.gc.result.int.i1(i32)
+declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32) #3
+
+
+; CHECK-LABEL: .section .llvm_stackmaps
+; CHECK-NEXT: __LLVM_StackMaps:
+; Header
+; CHECK-NEXT: .byte 1
+; CHECK-NEXT: .byte 0
+; CHECK-NEXT: .short 0
+; Num Functions
+; CHECK-NEXT: .long 1
+; Num LargeConstants
+; CHECK-NEXT: .long 0
+; Num Callsites
+; CHECK-NEXT: .long 1
+
+; Functions and stack size
+; CHECK-NEXT: .quad test
+; CHECK-NEXT: .quad 24
+
+; Large Constants
+; Statepoint ID only
+; CHECK: .quad 2882400000
+
+; Callsites
+; Constant arguments
+; CHECK: .long .Ltmp1-test
+; CHECK: .short 0
+; CHECK: .short 8
+; SmallConstant (0)
+; CHECK: .byte 4
+; CHECK: .byte 8
+; CHECK: .short 0
+; CHECK: .long 0
+; SmallConstant (2)
+; CHECK: .byte 4
+; CHECK: .byte 8
+; CHECK: .short 0
+; CHECK: .long 2
+; Direct Spill Slot [RSP+0]
+; CHECK: .byte 2
+; CHECK: .byte 8
+; CHECK: .short 7
+; CHECK: .long 0
+; SmallConstant (0)
+; CHECK: .byte 4
+; CHECK: .byte 8
+; CHECK: .short 0
+; CHECK: .long 0
+; SmallConstant (0)
+; CHECK: .byte 4
+; CHECK: .byte 8
+; CHECK: .short 0
+; CHECK: .long 0
+; SmallConstant (0)
+; CHECK: .byte 4
+; CHECK: .byte 8
+; CHECK: .short 0
+; CHECK: .long 0
+; Direct Spill Slot [RSP+0]
+; CHECK: .byte 2
+; CHECK: .byte 8
+; CHECK: .short 7
+; CHECK: .long 0
+; Direct Spill Slot [RSP+0]
+; CHECK: .byte 2
+; CHECK: .byte 8
+; CHECK: .short 7
+; CHECK: .long 0
+
+; No Padding or LiveOuts
+; CHECK: .short 0
+; CHECK: .short 0
+; CHECK: .align 8
+
+
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