Encapsulate megamorphic load/tail-call in hydrogen

src/ic/ia32/stub-cache-ia32.cc

 // Copyright 2012 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_IA32
 
 #include "src/codegen.h"
 #include "src/ic/stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 #define __ ACCESS_MASM(masm)
 
 
 static void ProbeTable(Isolate* isolate, MacroAssembler* masm,
-                       Code::Flags flags, StubCache::Table table, Register name,
-                       Register receiver,
+                       Code::Flags flags, bool leave_frame,
+                       StubCache::Table table, Register name, Register receiver,
                        // Number of the cache entry pointer-size scaled.
                        Register offset, Register extra) {
   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));
 
   Label miss;
 
   // Multiply by 3 because there are 3 fields per entry (name, code, map).
   __ lea(offset, Operand(offset, offset, times_2, 0));
@@ skipping 18 matching lines @@
     __ j(not_equal, &miss);
 
 #ifdef DEBUG
     if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
       __ jmp(&miss);
     } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
       __ jmp(&miss);
     }
 #endif
 
+    if (leave_frame) __ leave();
+
     // Jump to the first instruction in the code stub.
     __ add(extra, Immediate(Code::kHeaderSize - kHeapObjectTag));
     __ jmp(extra);
 
     __ bind(&miss);
   } else {
     // Save the offset on the stack.
     __ push(offset);
 
     // Check that the key in the entry matches the name.
@@ skipping 22 matching lines @@
       __ jmp(&miss);
     } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
       __ jmp(&miss);
     }
 #endif
 
     // Restore offset and re-load code entry from cache.
     __ pop(offset);
     __ mov(offset, Operand::StaticArray(offset, times_1, value_offset));
 
+    if (leave_frame) __ leave();
+
     // Jump to the first instruction in the code stub.
     __ add(offset, Immediate(Code::kHeaderSize - kHeapObjectTag));
     __ jmp(offset);
 
     // Pop at miss.
     __ bind(&miss);
     __ pop(offset);
   }
 }
 
 
 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) {
   Label miss;
 
   // Assert that code is valid.  The multiplying code relies on the entry size
   // being 12.
   DCHECK(sizeof(Entry) == 12);
 
   // Assert the flags do not name a specific type.
   DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
 
   // Assert that there are no register conflicts.
@@ skipping 22 matching lines @@
   __ add(offset, FieldOperand(receiver, HeapObject::kMapOffset));
   __ xor_(offset, flags);
   // We mask out the last two bits because they are not part of the hash and
   // they are always 01 for maps.  Also in the two 'and' instructions below.
   __ and_(offset, (kPrimaryTableSize - 1) << kCacheIndexShift);
   // ProbeTable expects the offset to be pointer scaled, which it is, because
   // the heap object tag size is 2 and the pointer size log 2 is also 2.
   DCHECK(kCacheIndexShift == kPointerSizeLog2);
 
   // Probe the primary table.
-  ProbeTable(isolate(), masm, flags, kPrimary, name, receiver, offset, extra);
+  ProbeTable(isolate(), masm, flags, leave_frame, kPrimary, name, receiver,
+             offset, extra);
 
   // Primary miss: Compute hash for secondary probe.
   __ mov(offset, FieldOperand(name, Name::kHashFieldOffset));
   __ add(offset, FieldOperand(receiver, HeapObject::kMapOffset));
   __ xor_(offset, flags);
   __ and_(offset, (kPrimaryTableSize - 1) << kCacheIndexShift);
   __ sub(offset, name);
   __ add(offset, Immediate(flags));
   __ and_(offset, (kSecondaryTableSize - 1) << kCacheIndexShift);
 
   // Probe the secondary table.
-  ProbeTable(isolate(), masm, flags, kSecondary, name, receiver, offset, extra);
+  ProbeTable(isolate(), masm, flags, leave_frame, kSecondary, name, receiver,
+             offset, extra);
 
   // Cache miss: Fall-through and let caller handle the miss by
   // entering the runtime system.
   __ bind(&miss);
   __ IncrementCounter(counters->megamorphic_stub_cache_misses(), 1);
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32