#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
+#include "llvm/CodeGen/GCMetadata.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/StackMaps.h"
STATISTIC(StatepointMaxSlotsRequired,
"Maximum number of stack slots required for a singe statepoint");
-void
-StatepointLoweringState::startNewStatepoint(SelectionDAGBuilder &Builder) {
+static void pushStackMapConstant(SmallVectorImpl<SDValue>& Ops,
+ SelectionDAGBuilder &Builder, uint64_t Value) {
+ SDLoc L = Builder.getCurSDLoc();
+ Ops.push_back(Builder.DAG.getTargetConstant(StackMaps::ConstantOp, L,
+ MVT::i64));
+ Ops.push_back(Builder.DAG.getTargetConstant(Value, L, MVT::i64));
+}
+
+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
AllocatedStackSlots[i] = false;
}
}
+
void StatepointLoweringState::clear() {
Locations.clear();
- RelocLocations.clear();
AllocatedStackSlots.clear();
assert(PendingGCRelocateCalls.empty() &&
"cleared before statepoint sequence completed");
/// 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");
+static SDNode *
+lowerCallFromStatepoint(ImmutableStatepoint ISP, MachineBasicBlock *LandingPad,
+ SelectionDAGBuilder &Builder,
+ SmallVectorImpl<SDValue> &PendingExports) {
+
+ ImmutableCallSite CS(ISP.getCallSite());
+
+ SDValue ActualCallee = Builder.getValue(ISP.getActualCallee());
+
+ // Handle immediate and symbolic callees.
+ if (auto *ConstCallee = dyn_cast<ConstantSDNode>(ActualCallee.getNode()))
+ ActualCallee = Builder.DAG.getIntPtrConstant(ConstCallee->getZExtValue(),
+ Builder.getCurSDLoc(),
+ /*isTarget=*/true);
+ else if (auto *SymbolicCallee =
+ dyn_cast<GlobalAddressSDNode>(ActualCallee.getNode()))
+ ActualCallee = Builder.DAG.getTargetGlobalAddress(
+ SymbolicCallee->getGlobal(), SDLoc(SymbolicCallee),
+ SymbolicCallee->getValueType(0));
+
+ assert(CS.getCallingConv() != CallingConv::AnyReg &&
+ "anyregcc is not supported on statepoints!");
+
+ Type *DefTy = ISP.getActualReturnType();
+ bool HasDef = !DefTy->isVoidTy();
+
+ SDValue ReturnValue, CallEndVal;
+ std::tie(ReturnValue, CallEndVal) = Builder.lowerCallOperands(
+ ISP.getCallSite(), ImmutableStatepoint::CallArgsBeginPos,
+ ISP.getNumCallArgs(), ActualCallee, DefTy, LandingPad,
+ false /* IsPatchPoint */);
+
+ SDNode *CallEnd = CallEndVal.getNode();
+
+ // Get a call instruction from the call sequence chain. Tail calls are not
+ // allowed. The following code is essentially reverse engineering X86's
+ // LowerCallTo.
+ //
+ // We are expecting DAG to have the following form:
+ //
+ // ch = eh_label (only in case of invoke statepoint)
+ // ch, glue = callseq_start ch
+ // ch, glue = X86::Call ch, glue
+ // ch, glue = callseq_end ch, glue
+ // get_return_value ch, glue
+ //
+ // get_return_value can either be a CopyFromReg to grab the return value from
+ // %RAX, or it can be a LOAD to load a value returned by reference via a stack
+ // slot.
+
+ if (HasDef && (CallEnd->getOpcode() == ISD::CopyFromReg ||
+ CallEnd->getOpcode() == ISD::LOAD))
+ CallEnd = CallEnd->getOperand(0).getNode();
+
+ assert(CallEnd->getOpcode() == ISD::CALLSEQ_END && "expected!");
- 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());
-
- 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));
+ if (CS.isInvoke()) {
+ // Result value will be used in different basic block for invokes
+ // so we need to export it now. But statepoint call has a different type
+ // than the actuall call. It means that standart exporting mechanism will
+ // create register of the wrong type. So instead we need to create
+ // register with correct type and save value into it manually.
+ // TODO: To eliminate this problem we can remove gc.result intrinsics
+ // completelly and make statepoint call to return a tuple.
+ unsigned Reg = Builder.FuncInfo.CreateRegs(ISP.getActualReturnType());
+ RegsForValue RFV(*Builder.DAG.getContext(),
+ Builder.DAG.getTargetLoweringInfo(), Reg,
+ ISP.getActualReturnType());
+ SDValue Chain = Builder.DAG.getEntryNode();
+
+ RFV.getCopyToRegs(ReturnValue, Builder.DAG, Builder.getCurSDLoc(), Chain,
+ nullptr);
+ PendingExports.push_back(Chain);
+ Builder.FuncInfo.ValueMap[CS.getInstruction()] = Reg;
+ } else {
+ // 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(CS.getInstruction(), ReturnValue);
+ }
} 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++;
+ Builder.setValue(CS.getInstruction(),
+ Builder.DAG.getIntPtrConstant(-1, Builder.getCurSDLoc()));
}
- assert(CallEnd->getOpcode() == ISD::CALLSEQ_END &&
- "Expected a callseq node.");
- assert(CallEnd->getGluedNode());
- // Step back inside the CALLSEQ
- CallNode = CallEnd->getGluedNode();
- return CallNode;
+ return CallEnd->getOperand(0).getNode();
}
/// Callect all gc pointers coming into statepoint intrinsic, clean them up,
/// 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());
+static void getIncomingStatepointGCValues(
+ SmallVectorImpl<const Value *> &Bases, SmallVectorImpl<const Value *> &Ptrs,
+ SmallVectorImpl<const Value *> &Relocs, ImmutableStatepoint StatepointSite,
+ SelectionDAGBuilder &Builder) {
+ for (GCRelocateOperands relocateOpers :
+ StatepointSite.getRelocates(StatepointSite)) {
+ Relocs.push_back(relocateOpers.getUnderlyingCallSite().getInstruction());
+ Bases.push_back(relocateOpers.getBasePtr());
+ Ptrs.push_back(relocateOpers.getDerivedPtr());
}
// Remove any redundant llvm::Values which map to the same SDValue as another
// 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));
+ pushStackMapConstant(Ops, Builder, C->getSExtValue());
} 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()));
+ // This handles allocas as arguments to the statepoint (this is only
+ // really meaningful for a deopt value. For GC, we'd be trying to
+ // relocate the address of the alloca itself?)
+ Ops.push_back(Builder.DAG.getTargetFrameIndex(FI->getIndex(),
+ Incoming.getValueType()));
} else {
// Otherwise, locate a spill slot and explicitly spill it so it
// can be found by the runtime later. We currently do not support
/// 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,
+ ImmutableStatepoint StatepointSite,
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);
+ getIncomingStatepointGCValues(Bases, Ptrs, Relocations, StatepointSite,
+ Builder);
#ifndef NDEBUG
// Check that each of the gc pointer and bases we've gotten out of the
// heap. This is basically just here to help catch errors during statepoint
// insertion. TODO: This should actually be in the Verifier, but we can't get
// to the GCStrategy from there (yet).
- if (Builder.GFI) {
- GCStrategy &S = Builder.GFI->getStrategy();
- for (const Value *V : Bases) {
- auto Opt = S.isGCManagedPointer(V);
- if (Opt.hasValue()) {
- assert(Opt.getValue() &&
- "non gc managed base pointer found in statepoint");
- }
+ GCStrategy &S = Builder.GFI->getStrategy();
+ for (const Value *V : Bases) {
+ auto Opt = S.isGCManagedPointer(V);
+ if (Opt.hasValue()) {
+ assert(Opt.getValue() &&
+ "non gc managed base pointer found in statepoint");
}
- for (const Value *V : Ptrs) {
- auto Opt = S.isGCManagedPointer(V);
- if (Opt.hasValue()) {
- assert(Opt.getValue() &&
- "non gc managed derived pointer found in statepoint");
- }
+ }
+ for (const Value *V : Ptrs) {
+ auto Opt = S.isGCManagedPointer(V);
+ if (Opt.hasValue()) {
+ assert(Opt.getValue() &&
+ "non gc managed derived pointer found in statepoint");
}
- for (const Value *V : Relocations) {
- auto Opt = S.isGCManagedPointer(V);
- if (Opt.hasValue()) {
- assert(Opt.getValue() && "non gc managed pointer relocated");
- }
+ }
+ for (const Value *V : Relocations) {
+ auto Opt = S.isGCManagedPointer(V);
+ if (Opt.hasValue()) {
+ assert(Opt.getValue() && "non gc managed pointer relocated");
}
}
#endif
-
-
// 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;
+ for (const Value *V : StatepointSite.vm_state_args()) {
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);
+ for (unsigned i = 0; i < Bases.size(); ++i) {
+ const Value *Base = Bases[i];
+ reservePreviousStackSlotForValue(Builder.getValue(Base), Builder);
+
+ const Value *Ptr = Ptrs[i];
+ reservePreviousStackSlotForValue(Builder.getValue(Ptr), 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));
+ const int NumVMSArgs = StatepointSite.getNumTotalVMSArgs();
+ pushStackMapConstant(Ops, Builder, NumVMSArgs);
- assert(NumVMSArgs + 1 == std::distance(Statepoint.vm_state_begin(),
- Statepoint.vm_state_end()));
+ assert(NumVMSArgs == std::distance(StatepointSite.vm_state_begin(),
+ StatepointSite.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
// 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;
+ for (const Value *V : StatepointSite.vm_state_args()) {
SDValue Incoming = Builder.getValue(V);
lowerIncomingStatepointValue(Incoming, Ops, Builder);
}
// 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];
+ for (unsigned i = 0; i < Bases.size(); ++i) {
+ const Value *Base = Bases[i];
+ lowerIncomingStatepointValue(Builder.getValue(Base), Ops, Builder);
+
+ const Value *Ptr = Ptrs[i];
+ lowerIncomingStatepointValue(Builder.getValue(Ptr), Ops, Builder);
+ }
+
+ // If there are any explicit spill slots passed to the statepoint, record
+ // them, but otherwise do not do anything special. These are user provided
+ // allocas and give control over placement to the consumer. In this case,
+ // it is the contents of the slot which may get updated, not the pointer to
+ // the alloca
+ for (Value *V : StatepointSite.gc_args()) {
SDValue Incoming = Builder.getValue(V);
- lowerIncomingStatepointValue(Incoming, Ops, Builder);
+ if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Incoming)) {
+ // This handles allocas as arguments to the statepoint
+ Ops.push_back(Builder.DAG.getTargetFrameIndex(FI->getIndex(),
+ Incoming.getValueType()));
+ }
+ }
+
+ // Record computed locations for all lowered values.
+ // This can not be embedded in lowering loops as we need to record *all*
+ // values, while previous loops account only values with unique SDValues.
+ const Instruction *StatepointInstr =
+ StatepointSite.getCallSite().getInstruction();
+ FunctionLoweringInfo::StatepointSpilledValueMapTy &SpillMap =
+ Builder.FuncInfo.StatepointRelocatedValues[StatepointInstr];
+
+ for (GCRelocateOperands RelocateOpers :
+ StatepointSite.getRelocates(StatepointSite)) {
+ const Value *V = RelocateOpers.getDerivedPtr();
+ SDValue SDV = Builder.getValue(V);
+ SDValue Loc = Builder.StatepointLowering.getLocation(SDV);
+
+ if (Loc.getNode()) {
+ SpillMap[V] = cast<FrameIndexSDNode>(Loc)->getIndex();
+ } else {
+ // Record value as visited, but not spilled. This is case for allocas
+ // and constants. For this values we can avoid emiting spill load while
+ // visiting corresponding gc_relocate.
+ // Actually we do not need to record them in this map at all.
+ // We do this only to check that we are not relocating any unvisited value.
+ SpillMap[V] = None;
+
+ // Default llvm mechanisms for exporting values which are used in
+ // different basic blocks does not work for gc relocates.
+ // Note that it would be incorrect to teach llvm that all relocates are
+ // uses of the corresponging values so that it would automatically
+ // export them. Relocates of the spilled values does not use original
+ // value.
+ if (StatepointSite.getCallSite().isInvoke())
+ Builder.ExportFromCurrentBlock(V);
+ }
}
}
+
void SelectionDAGBuilder::visitStatepoint(const CallInst &CI) {
+ // Check some preconditions for sanity
+ assert(isStatepoint(&CI) &&
+ "function called must be the statepoint function");
+
+ LowerStatepoint(ImmutableStatepoint(&CI));
+}
+
+void SelectionDAGBuilder::LowerStatepoint(
+ ImmutableStatepoint ISP, MachineBasicBlock *LandingPad /*=nullptr*/) {
// 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);
+ ImmutableCallSite CS(ISP.getCallSite());
+
#ifndef NDEBUG
- // Consistency check
- for (const User *U : CI.users()) {
- const CallInst *Call = cast<CallInst>(U);
- if (isGCRelocate(Call))
- StatepointLowering.scheduleRelocCall(*Call);
+ // Consistency check. Don't do this for invokes. It would be too
+ // expensive to preserve this information across different basic blocks
+ if (!CS.isInvoke()) {
+ for (const User *U : CS->users()) {
+ const CallInst *Call = cast<CallInst>(U);
+ if (isGCRelocate(Call))
+ StatepointLowering.scheduleRelocCall(*Call);
+ }
}
#endif
- ImmutableStatepoint ISP(&CI);
#ifndef NDEBUG
// If this is a malformed statepoint, report it early to simplify debugging.
// This should catch any IR level mistake that's made when constructing or
ISP.verify();
// Check that the associated GCStrategy expects to encounter statepoints.
- // TODO: This if should become an assert. For now, we allow the GCStrategy
- // to be optional for backwards compatibility. This will only last a short
- // period (i.e. a couple of weeks).
- if (GFI) {
- assert(GFI->getStrategy().useStatepoints() &&
- "GCStrategy does not expect to encounter statepoints");
- }
+ assert(GFI->getStrategy().useStatepoints() &&
+ "GCStrategy does not expect to encounter statepoints");
#endif
-
// Lower statepoint vmstate and gcstate arguments
- SmallVector<SDValue, 10> LoweredArgs;
- lowerStatepointMetaArgs(LoweredArgs, ISP, *this);
+ SmallVector<SDValue, 10> LoweredMetaArgs;
+ lowerStatepointMetaArgs(LoweredMetaArgs, ISP, *this);
// Get call node, we will replace it later with statepoint
- SDNode *CallNode = lowerCallFromStatepoint(CI, *this);
+ SDNode *CallNode =
+ lowerCallFromStatepoint(ISP, LandingPad, *this, PendingExports);
- // Construct the actual STATEPOINT node with all the appropriate arguments
- // and return values.
+ // Construct the actual GC_TRANSITION_START, STATEPOINT, and GC_TRANSITION_END
+ // nodes with all the appropriate arguments and return values.
+
+ // Call Node: Chain, Target, {Args}, RegMask, [Glue]
+ SDValue Chain = CallNode->getOperand(0);
+
+ SDValue Glue;
+ bool CallHasIncomingGlue = CallNode->getGluedNode();
+ if (CallHasIncomingGlue) {
+ // Glue is always last operand
+ Glue = CallNode->getOperand(CallNode->getNumOperands() - 1);
+ }
+
+ // Build the GC_TRANSITION_START node if necessary.
+ //
+ // The operands to the GC_TRANSITION_{START,END} nodes are laid out in the
+ // order in which they appear in the call to the statepoint intrinsic. If
+ // any of the operands is a pointer-typed, that operand is immediately
+ // followed by a SRCVALUE for the pointer that may be used during lowering
+ // (e.g. to form MachinePointerInfo values for loads/stores).
+ const bool IsGCTransition =
+ (ISP.getFlags() & (uint64_t)StatepointFlags::GCTransition) ==
+ (uint64_t)StatepointFlags::GCTransition;
+ if (IsGCTransition) {
+ SmallVector<SDValue, 8> TSOps;
+
+ // Add chain
+ TSOps.push_back(Chain);
+
+ // Add GC transition arguments
+ for (const Value *V : ISP.gc_transition_args()) {
+ TSOps.push_back(getValue(V));
+ if (V->getType()->isPointerTy())
+ TSOps.push_back(DAG.getSrcValue(V));
+ }
+
+ // Add glue if necessary
+ if (CallHasIncomingGlue)
+ TSOps.push_back(Glue);
+
+ SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
+
+ SDValue GCTransitionStart =
+ DAG.getNode(ISD::GC_TRANSITION_START, getCurSDLoc(), NodeTys, TSOps);
+
+ Chain = GCTransitionStart.getValue(0);
+ Glue = GCTransitionStart.getValue(1);
+ }
// 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;
+ // Add the <id> and <numBytes> constants.
+ Ops.push_back(DAG.getTargetConstant(ISP.getID(), getCurSDLoc(), MVT::i64));
+ Ops.push_back(
+ DAG.getTargetConstant(ISP.getNumPatchBytes(), getCurSDLoc(), MVT::i32));
+
// 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));
+ CallNode->getNumOperands() - (CallHasIncomingGlue ? 4 : 3);
+ Ops.push_back(DAG.getTargetConstant(NumCallRegArgs, getCurSDLoc(), MVT::i32));
// Add call target
SDValue CallTarget = SDValue(CallNode->getOperand(1).getNode(), 0);
// Add call arguments
// Get position of register mask in the call
SDNode::op_iterator RegMaskIt;
- if (Glue.getNode())
+ if (CallHasIncomingGlue)
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));
+ // Add a constant argument for the calling convention
+ pushStackMapConstant(Ops, *this, CS.getCallingConv());
+
+ // Add a constant argument for the flags
+ uint64_t Flags = ISP.getFlags();
+ assert(
+ ((Flags & ~(uint64_t)StatepointFlags::MaskAll) == 0)
+ && "unknown flag used");
+ pushStackMapConstant(Ops, *this, Flags);
// Insert all vmstate and gcstate arguments
- Ops.insert(Ops.end(), LoweredArgs.begin(), LoweredArgs.end());
+ Ops.insert(Ops.end(), LoweredMetaArgs.begin(), LoweredMetaArgs.end());
// Add register mask from call node
Ops.push_back(*RegMaskIt);
// Add chain
- Ops.push_back(CallNode->getOperand(0));
+ Ops.push_back(Chain);
// 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);
+ // Compute return values. Provide a glue output since we consume one as
+ // input. This allows someone else to chain off us as needed.
+ SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
+
+ SDNode *StatepointMCNode =
+ DAG.getMachineNode(TargetOpcode::STATEPOINT, getCurSDLoc(), NodeTys, Ops);
+
+ SDNode *SinkNode = StatepointMCNode;
- SDNode *StatepointMCNode = DAG.getMachineNode(TargetOpcode::STATEPOINT,
- getCurSDLoc(), NodeTys, Ops);
+ // Build the GC_TRANSITION_END node if necessary.
+ //
+ // See the comment above regarding GC_TRANSITION_START for the layout of
+ // the operands to the GC_TRANSITION_END node.
+ if (IsGCTransition) {
+ SmallVector<SDValue, 8> TEOps;
+
+ // Add chain
+ TEOps.push_back(SDValue(StatepointMCNode, 0));
+
+ // Add GC transition arguments
+ for (const Value *V : ISP.gc_transition_args()) {
+ TEOps.push_back(getValue(V));
+ if (V->getType()->isPointerTy())
+ TEOps.push_back(DAG.getSrcValue(V));
+ }
+
+ // Add glue
+ TEOps.push_back(SDValue(StatepointMCNode, 1));
+
+ SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
+
+ SDValue GCTransitionStart =
+ DAG.getNode(ISD::GC_TRANSITION_END, getCurSDLoc(), NodeTys, TEOps);
+
+ SinkNode = GCTransitionStart.getNode();
+ }
// Replace original call
- DAG.ReplaceAllUsesWith(CallNode, StatepointMCNode); // This may update Root
+ DAG.ReplaceAllUsesWith(CallNode, SinkNode); // This may update Root
// Remove originall call node
DAG.DeleteNode(CallNode);
// 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));
+ assert(isStatepoint(I) && "first argument must be a statepoint token");
+
+ if (isa<InvokeInst>(I)) {
+ // For invokes we should have stored call result in a virtual register.
+ // We can not use default getValue() functionality to copy value from this
+ // register because statepoint and actuall call return types can be
+ // different, and getValue() will use CopyFromReg of the wrong type,
+ // which is always i32 in our case.
+ PointerType *CalleeType =
+ cast<PointerType>(ImmutableStatepoint(I).getActualCallee()->getType());
+ Type *RetTy =
+ cast<FunctionType>(CalleeType->getElementType())->getReturnType();
+ SDValue CopyFromReg = getCopyFromRegs(I, RetTy);
+
+ assert(CopyFromReg.getNode());
+ setValue(&CI, CopyFromReg);
+ } else {
+ setValue(&CI, getValue(I));
+ }
}
void SelectionDAGBuilder::visitGCRelocate(const CallInst &CI) {
+ GCRelocateOperands RelocateOpers(&CI);
+
#ifndef NDEBUG
// Consistency check
- StatepointLowering.relocCallVisited(CI);
+ // We skip this check for invoke statepoints. It would be too expensive to
+ // preserve validation info through different basic blocks.
+ if (!RelocateOpers.isTiedToInvoke()) {
+ StatepointLowering.relocCallVisited(CI);
+ }
#endif
- GCRelocateOperands relocateOpers(&CI);
- SDValue SD = getValue(relocateOpers.derivedPtr());
+ const Value *DerivedPtr = RelocateOpers.getDerivedPtr();
+ SDValue SD = getValue(DerivedPtr);
+
+ FunctionLoweringInfo::StatepointSpilledValueMapTy &SpillMap =
+ FuncInfo.StatepointRelocatedValues[RelocateOpers.getStatepoint()];
- 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.
+ // We should have recorded location for this pointer
+ assert(SpillMap.count(DerivedPtr) && "Relocating not lowered gc value");
+ Optional<int> DerivedPtrLocation = SpillMap[DerivedPtr];
+
+ // We didn't need to spill these special cases (constants and allocas).
+ // See the handling in spillIncomingValueForStatepoint for detail.
+ if (!DerivedPtrLocation) {
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();
+ SDValue SpillSlot = DAG.getTargetFrameIndex(*DerivedPtrLocation,
+ SD.getValueType());
- // Be conservative: flush all pending loads
- // TODO: Probably we can be less restrictive on this,
- // it may allow more scheduling opprtunities
- SDValue Chain = getRoot();
+ // 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);
+ SDValue SpillLoad =
+ DAG.getLoad(SpillSlot.getValueType(), getCurSDLoc(), Chain, SpillSlot,
+ MachinePointerInfo::getFixedStack(*DerivedPtrLocation),
+ false, false, false, 0);
- StatepointLowering.setRelocLocation(SD, Loc);
+ // Again, be conservative, don't emit pending loads
+ DAG.setRoot(SpillLoad.getValue(1));
- // Again, be conservative, don't emit pending loads
- DAG.setRoot(Loc.getValue(1));
- }
-
- assert(Loc.getNode());
- setValue(&CI, Loc);
+ assert(SpillLoad.getNode());
+ setValue(&CI, SpillLoad);
}
projects / oota-llvm.git / blobdiff