From 2c3e0051c31c3f5b2328b447eadf1cf9c4427442 Mon Sep 17 00:00:00 2001
From: Pirama Arumuga Nainar <pirama@google.com>
Date: Wed, 6 May 2015 11:46:36 -0700
Subject: Update aosp/master LLVM for rebase to r235153

Change-Id: I9bf53792f9fc30570e81a8d80d296c681d005ea7
(cherry picked from commit 0c7f116bb6950ef819323d855415b2f2b0aad987)
---
 lib/CodeGen/SelectionDAG/StatepointLowering.cpp | 68 +++++++++++++++----------
 1 file changed, 40 insertions(+), 28 deletions(-)

(limited to 'lib/CodeGen/SelectionDAG/StatepointLowering.cpp')

diff --git a/lib/CodeGen/SelectionDAG/StatepointLowering.cpp b/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
index 3cc7a98..a9ffa72 100644
--- a/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
@@ -397,10 +397,11 @@ static void lowerIncomingStatepointValue(SDValue Incoming,
         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()));
+    // 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
@@ -441,27 +442,25 @@ static void lowerStatepointMetaArgs(SmallVectorImpl<SDValue> &Ops,
   // 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
@@ -523,6 +522,21 @@ static void lowerStatepointMetaArgs(SmallVectorImpl<SDValue> &Ops,
     SDValue Incoming = Builder.getValue(V);
     lowerIncomingStatepointValue(Incoming, 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);
+    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()));
+
+    }
+  }
 }
 
 void SelectionDAGBuilder::visitStatepoint(const CallInst &CI) {
@@ -565,10 +579,8 @@ SelectionDAGBuilder::LowerStatepoint(ImmutableStatepoint ISP,
   // 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
@@ -614,7 +626,7 @@ SelectionDAGBuilder::LowerStatepoint(ImmutableStatepoint ISP,
   // Add a leading constant argument with the Flags and the calling convention
   // masked together
   CallingConv::ID CallConv = CS.getCallingConv();
-  int Flags = dyn_cast<ConstantInt>(CS.getArgument(2))->getZExtValue();
+  int Flags = cast<ConstantInt>(CS.getArgument(2))->getZExtValue();
   assert(Flags == 0 && "not expected to be used");
   Ops.push_back(DAG.getTargetConstant(StackMaps::ConstantOp, MVT::i64));
   Ops.push_back(
-- 
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