Allow HPushArgument to handle more than one argument.

src/arm64/lithium-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM64_LITHIUM_ARM64_H_
 #define V8_ARM64_LITHIUM_ARM64_H_
 
 #include "hydrogen.h"
 #include "lithium-allocator.h"
 #include "lithium.h"
@@ skipping 118 matching lines @@
   V(ModI)                                       \
   V(MulConstIS)                                 \
   V(MulI)                                       \
   V(MulS)                                       \
   V(NumberTagD)                                 \
   V(NumberTagU)                                 \
   V(NumberUntagD)                               \
   V(OsrEntry)                                   \
   V(Parameter)                                  \
   V(Power)                                      \
-  V(PushArgument)                               \
+  V(PreparePushArguments)                       \
+  V(PushArguments)                              \
   V(RegExpLiteral)                              \
   V(Return)                                     \
   V(SeqStringGetChar)                           \
   V(SeqStringSetChar)                           \
   V(ShiftI)                                     \
   V(ShiftS)                                     \
   V(SmiTag)                                     \
   V(SmiUntag)                                   \
   V(StackCheck)                                 \
   V(StoreCodeEntry)                             \
@@ skipping 2092 matching lines @@
   }
 
   LOperand* left() { return inputs_[0]; }
   LOperand* right() { return inputs_[1]; }
 
   DECLARE_CONCRETE_INSTRUCTION(Power, "power")
   DECLARE_HYDROGEN_ACCESSOR(Power)
 };
 
 
-class LPushArgument V8_FINAL : public LTemplateInstruction<0, 1, 0> {
+class LPreparePushArguments V8_FINAL : public LTemplateInstruction<0, 0, 0> {
  public:
-  explicit LPushArgument(LOperand* value) {
-    inputs_[0] = value;
-  }
+  explicit LPreparePushArguments(int argc) : argc_(argc) {}
 
-  LOperand* value() { return inputs_[0]; }
+  inline int argc() const { return argc_; }
 
-  DECLARE_CONCRETE_INSTRUCTION(PushArgument, "push-argument")
+  DECLARE_CONCRETE_INSTRUCTION(PreparePushArguments, "prepare-push-arguments")
+
+ protected:
+  int argc_;
 };
 
 
+class LPushArguments V8_FINAL : public LTemplateResultInstruction<0> {
+ public:
+  explicit LPushArguments(Zone* zone,
+                          int capacity = kRecommendedMaxPushedArgs)
+      : zone_(zone), inputs_(capacity, zone) {}
+
+  LOperand* argument(int i) { return inputs_[i]; }
+  int ArgumentCount() const { return inputs_.length(); }
+
+  void AddArgument(LOperand* arg) { inputs_.Add(arg, zone_); }
+
+  DECLARE_CONCRETE_INSTRUCTION(PushArguments, "push-arguments")
+
+  // It is better to limit the number of arguments pushed simultaneously to
+  // avoid pressure on the register allocator.
+  static const int kRecommendedMaxPushedArgs = 4;
+  bool ShouldSplitPush() const {
+    return inputs_.length() >= kRecommendedMaxPushedArgs;
+  }
+
+ protected:
+  Zone* zone_;
+  ZoneList<LOperand*> inputs_;
+
+ private:
+  // Iterator support.
+  virtual int InputCount() V8_FINAL V8_OVERRIDE { return inputs_.length(); }
+  virtual LOperand* InputAt(int i) V8_FINAL V8_OVERRIDE { return inputs_[i]; }
+
+  virtual int TempCount() V8_FINAL V8_OVERRIDE { return 0; }
+  virtual LOperand* TempAt(int i) V8_FINAL V8_OVERRIDE { return NULL; }
+};
+
+
 class LRegExpLiteral V8_FINAL : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LRegExpLiteral(LOperand* context) {
     inputs_[0] = context;
   }
 
   LOperand* context() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(RegExpLiteral, "regexp-literal")
   DECLARE_HYDROGEN_ACCESSOR(RegExpLiteral)
@@ skipping 915 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_LITHIUM_ARM64_H_