}
}
+/// getCopyFromRegs - If there was virtual register allocated for the value V
+/// emit CopyFromReg of the specified type Ty. Return empty SDValue() otherwise.
+SDValue SelectionDAGBuilder::getCopyFromRegs(const Value *V, Type *Ty) {
+ DenseMap<const Value *, unsigned>::iterator It = FuncInfo.ValueMap.find(V);
+ SDValue res;
+
+ if (It != FuncInfo.ValueMap.end()) {
+ unsigned InReg = It->second;
+ RegsForValue RFV(*DAG.getContext(), DAG.getTargetLoweringInfo(), InReg,
+ Ty);
+ SDValue Chain = DAG.getEntryNode();
+ res = RFV.getCopyFromRegs(DAG, FuncInfo, getCurSDLoc(), Chain, nullptr, V);
+ resolveDanglingDebugInfo(V, res);
+ }
+
+ return res;
+}
+
/// getValue - Return an SDValue for the given Value.
SDValue SelectionDAGBuilder::getValue(const Value *V) {
// If we already have an SDValue for this value, use it. It's important
// If there's a virtual register allocated and initialized for this
// value, use it.
- DenseMap<const Value *, unsigned>::iterator It = FuncInfo.ValueMap.find(V);
- if (It != FuncInfo.ValueMap.end()) {
- unsigned InReg = It->second;
- RegsForValue RFV(*DAG.getContext(), DAG.getTargetLoweringInfo(), InReg,
- V->getType());
- SDValue Chain = DAG.getEntryNode();
- N = RFV.getCopyFromRegs(DAG, FuncInfo, getCurSDLoc(), Chain, nullptr, V);
- resolveDanglingDebugInfo(V, N);
- return N;
+ SDValue copyFromReg = getCopyFromRegs(V, V->getType());
+ if (copyFromReg.getNode()) {
+ return copyFromReg;
}
// Otherwise create a new SDValue and remember it.
case Intrinsic::experimental_patchpoint_i64:
visitPatchpoint(&I, LandingPad);
break;
+ case Intrinsic::experimental_gc_statepoint:
+ LowerStatepoint(ImmutableStatepoint(&I), LandingPad);
+ break;
}
} else
LowerCallTo(&I, getValue(Callee), false, LandingPad);
// If the value of the invoke is used outside of its defining block, make it
// available as a virtual register.
- CopyToExportRegsIfNeeded(&I);
+ // We already took care of the exported value for the statepoint instruction
+ // during call to the LowerStatepoint.
+ if (!isStatepoint(I)) {
+ CopyToExportRegsIfNeeded(&I);
+ }
// Update successor info
addSuccessorWithWeight(InvokeMBB, Return);
/// call node. Also update NodeMap so that getValue(statepoint) will
/// reference lowered call result
static SDNode *lowerCallFromStatepoint(ImmutableStatepoint StatepointSite,
+ MachineBasicBlock *LandingPad,
SelectionDAGBuilder &Builder) {
ImmutableCallSite CS(StatepointSite.getCallSite());
Tmp->setTailCall(CS.isTailCall());
Tmp->setCallingConv(CS.getCallingConv());
Tmp->setAttributes(CS.getAttributes());
- Builder.LowerCallTo(Tmp, Builder.getValue(ActualCallee), false);
+ Builder.LowerCallTo(Tmp, Builder.getValue(ActualCallee), false, LandingPad);
// 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(CS.getInstruction(), 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(Tmp->getType());
+ Builder.CopyValueToVirtualRegister(Tmp, reg);
+ 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(), Builder.getValue(Tmp));
+ }
} else {
// The token value is never used from here on, just generate a poison value
Builder.setValue(CS.getInstruction(), Builder.DAG.getIntPtrConstant(-1));
// Search for the call node
// 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
+ // ch = eh_label ch (only in case of invoke statepoint)
+ //
+ // DAG root will be either last eh_label or callseq_end.
+
SDNode *CallNode = nullptr;
// We just emitted a call, so it should be last thing generated
SDNode *CallEnd = Chain.getNode();
int Sanity = 0;
while (CallEnd->getOpcode() != ISD::CALLSEQ_END) {
- CallEnd = CallEnd->getGluedNode();
- assert(CallEnd && "Can not find call node");
+ assert(CallEnd->getNumOperands() >= 1 &&
+ CallEnd->getOperand(0).getValueType() == MVT::Other);
+
+ CallEnd = CallEnd->getOperand(0).getNode();
+
assert(Sanity < 20 && "should have found call end already");
Sanity++;
}
LowerStatepoint(ImmutableStatepoint(&CI));
}
-void SelectionDAGBuilder::LowerStatepoint(ImmutableStatepoint ISP) {
+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.
}
#endif
-
// 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(ISP, *this);
+ SDNode *CallNode = lowerCallFromStatepoint(ISP, LandingPad, *this);
// Construct the actual STATEPOINT node with all the appropriate arguments
// and return values.
assert(isStatepoint(I) &&
"first argument must be a statepoint token");
- setValue(&CI, getValue(I));
+ 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).actualCallee()->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) {
--- /dev/null
+; RUN: llc < %s 2>&1 | FileCheck %s
+
+target triple = "x86_64-pc-linux-gnu"
+
+declare i64 addrspace(1)* @"some_other_call"(i64 addrspace(1)*)
+
+declare i32 @"personality_function"()
+
+define i64 addrspace(1)* @test_result(i64 addrspace(1)* %obj, i64 addrspace(1)* %obj1) {
+entry:
+ ; CHECK: .Ltmp{{[0-9]+}}:
+ ; CHECK: callq some_other_call
+ ; CHECK: .Ltmp{{[0-9]+}}:
+ %0 = invoke i32 (i64 addrspace(1)* (i64 addrspace(1)*)*, i32, i32, ...)* @llvm.experimental.gc.statepoint.p0f_p1i64p1i64f(i64 addrspace(1)* (i64 addrspace(1)*)* @some_other_call, i32 1, i32 0, i64 addrspace(1)* %obj, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i64 addrspace(1)* %obj, i64 addrspace(1)* %obj1)
+ to label %normal_return unwind label %exceptional_return
+
+normal_return:
+ ; CHECK: popq
+ ; CHECK: retq
+ %ret_val = call i64 addrspace(1)* @llvm.experimental.gc.result.p1i64(i32 %0)
+ ret i64 addrspace(1)* %ret_val
+
+exceptional_return:
+ ; CHECK: .Ltmp{{[0-9]+}}:
+ ; CHECK: popq
+ ; CHECK: retq
+ %landing_pad = landingpad { i8*, i32 } personality i32 ()* @personality_function
+ cleanup
+ ret i64 addrspace(1)* %obj
+}
+; CHECK-LABEL: GCC_except_table{{[0-9]+}}:
+; CHECK: .long .Ltmp{{[0-9]+}}-.Ltmp{{[0-9]+}}
+; CHECK: .long .Ltmp{{[0-9]+}}-.Lfunc_begin{{[0-9]+}}
+; CHECK: .byte 0
+; CHECK: .align 4
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_p1i64p1i64f(i64 addrspace(1)* (i64 addrspace(1)*)*, i32, i32, ...)
+declare i64 addrspace(1)* @llvm.experimental.gc.result.p1i64(i32)
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