Inlining monomorphic calls.

runtime/vm/flow_graph.cc

Index: runtime/vm/flow_graph.cc
diff --git a/runtime/vm/flow_graph.cc b/runtime/vm/flow_graph.cc
index 71c6c31ad2f070f2584d6c781551e7281c022cbb..bbc2bee5b4a438970577eb86d9438e3bf07aa8e7 100644
--- a/runtime/vm/flow_graph.cc
+++ b/runtime/vm/flow_graph.cc
@@ -753,13 +753,13 @@ static void Link(Instruction* prev, Instruction* next) {
 
 // Inline a flow graph at a call site.
 //
-// Assumes the callee graph was computed with BuildGraphForInlining and
-// transformed to SSA with ComputeSSAForInlining, and that the use lists have
-// been correctly computed.
+// Assumes the callee graph was computed by BuildGraph with an inlining context
+// and transformed to SSA with ComputeSSA with a correct virtual register
+// number, and that the use lists have been correctly computed.
 //
 // After inlining the caller graph will correctly have adjusted the pre/post
 // orders, the dominator tree and the use lists.
-void FlowGraph::InlineCall(StaticCallInstr* call, FlowGraph* callee_graph) {
+void FlowGraph::InlineCall(Definition* call, FlowGraph* callee_graph) {
   ASSERT(callee_graph->exits() != NULL);
   ASSERT(callee_graph->graph_entry()->SuccessorCount() == 1);
   ASSERT(callee_graph->max_virtual_register_number() >
@@ -771,11 +771,16 @@ void FlowGraph::InlineCall(StaticCallInstr* call, FlowGraph* callee_graph) {
   // Adjust the SSA temp index by the callee graph's index.
   current_ssa_temp_index_ = callee_graph->max_virtual_register_number();
 
+  BlockEntryInstr* caller_entry = GetBlockEntry(call);
   TargetEntryInstr* callee_entry = callee_graph->graph_entry()->normal_entry();
   ZoneGrowableArray<ReturnInstr*>* callee_exits = callee_graph->exits();
 
   // 1. Insert the callee graph into the caller graph.
-  if (callee_exits->length() == 1) {
+  if (callee_exits->length() == 0) {
+    // If no normal exits exist, inline and truncate the block after inlining.
+    Link(call->previous(), callee_entry->next());
+    caller_entry->set_last_instruction(callee_entry->last_instruction());
+  } else if (callee_exits->length() == 1) {
     ReturnInstr* exit = (*callee_exits)[0];
     // TODO(zerny): Support one exit graph containing control flow.
     ASSERT(callee_entry == GetBlockEntry(exit));
@@ -790,13 +795,6 @@ void FlowGraph::InlineCall(StaticCallInstr* call, FlowGraph* callee_graph) {
 
   // TODO(zerny): Adjust pre/post orders.
   // TODO(zerny): Update dominator tree.
-
-  // Remove original arguments to the call.
-  for (intptr_t i = 0; i < call->ArgumentCount(); ++i) {
-    PushArgumentInstr* push = call->ArgumentAt(i);
-    push->ReplaceUsesWith(push->value()->definition());
-    push->RemoveFromGraph();
-  }
 }