Encapsulate megamorphic load/tail-call in hydrogen

src/ic/arm64/stub-cache-arm64.cc

 // 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/codegen.h"
 #include "src/ic/stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 
 #define __ ACCESS_MASM(masm)
 
 
 // Probe primary or secondary table.
 // If the entry is found in the cache, the generated code jump to the first
 // instruction of the stub in the cache.
 // If there is a miss the code fall trough.
 //
 // 'receiver', 'name' and 'offset' registers are preserved on miss.
 static void ProbeTable(Isolate* isolate, MacroAssembler* masm,
-                       Code::Flags flags, StubCache::Table table,
-                       Register receiver, Register name, Register offset,
-                       Register scratch, Register scratch2, Register scratch3) {
+                       Code::Flags flags, bool leave_frame,
+                       StubCache::Table table, Register receiver, Register name,
+                       Register offset, Register scratch, Register scratch2,
+                       Register scratch3) {
   // Some code below relies on the fact that the Entry struct contains
   // 3 pointers (name, code, map).
   STATIC_ASSERT(sizeof(StubCache::Entry) == (3 * kPointerSize));
 
   ExternalReference key_offset(isolate->stub_cache()->key_reference(table));
   ExternalReference value_offset(isolate->stub_cache()->value_reference(table));
   ExternalReference map_offset(isolate->stub_cache()->map_reference(table));
 
   uintptr_t key_off_addr = reinterpret_cast<uintptr_t>(key_offset.address());
   uintptr_t value_off_addr =
@@ skipping 32 matching lines @@
   __ B(ne, &miss);
 
 #ifdef DEBUG
   if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
     __ B(&miss);
   } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
     __ B(&miss);
   }
 #endif
 
+  if (leave_frame) __ LeaveFrame(StackFrame::INTERNAL);
+
   // Jump to the first instruction in the code stub.
   __ Add(scratch, scratch, Code::kHeaderSize - kHeapObjectTag);
   __ Br(scratch);
 
   // Miss: fall through.
   __ Bind(&miss);
 }
 
 
 void StubCache::GenerateProbe(MacroAssembler* masm, Code::Flags flags,
-                              Register receiver, Register name,
-                              Register scratch, Register extra, Register extra2,
-                              Register extra3) {
+                              bool leave_frame, Register receiver,
+                              Register name, Register scratch, Register extra,
+                              Register extra2, Register extra3) {
   Isolate* isolate = masm->isolate();
   Label miss;
 
   // Make sure the flags does not name a specific type.
   DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
 
   // Make sure that there are no register conflicts.
   DCHECK(!AreAliased(receiver, name, scratch, extra, extra2, extra3));
 
   // Make sure extra and extra2 registers are valid.
@@ skipping 11 matching lines @@
   // Compute the hash for primary table.
   __ Ldr(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
   __ Ldr(extra, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ Add(scratch, scratch, extra);
   __ Eor(scratch, scratch, flags);
   // We shift out the last two bits because they are not part of the hash.
   __ Ubfx(scratch, scratch, kCacheIndexShift,
           CountTrailingZeros(kPrimaryTableSize, 64));
 
   // Probe the primary table.
-  ProbeTable(isolate, masm, flags, kPrimary, receiver, name, scratch, extra,
-             extra2, extra3);
+  ProbeTable(isolate, masm, flags, leave_frame, kPrimary, receiver, name,
+             scratch, extra, extra2, extra3);
 
   // Primary miss: Compute hash for secondary table.
   __ Sub(scratch, scratch, Operand(name, LSR, kCacheIndexShift));
   __ Add(scratch, scratch, flags >> kCacheIndexShift);
   __ And(scratch, scratch, kSecondaryTableSize - 1);
 
   // Probe the secondary table.
-  ProbeTable(isolate, masm, flags, kSecondary, receiver, name, scratch, extra,
-             extra2, extra3);
+  ProbeTable(isolate, masm, flags, leave_frame, kSecondary, receiver, name,
+             scratch, extra, extra2, extra3);
 
   // Cache miss: Fall-through and let caller handle the miss by
   // entering the runtime system.
   __ Bind(&miss);
   __ IncrementCounter(counters->megamorphic_stub_cache_misses(), 1, extra2,
                       extra3);
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64