Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1994 matching lines @@
   __ movq(right, Address(RSP, 1 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right);
   __ ret();
 }
 
 
 // Called from megamorphic calls.
 //  RDI: receiver
 //  RBX: MegamorphicCache (preserved)
 // Result:
-//  RCX: target entry point
 //  CODE_REG: target Code
 //  R10: arguments descriptor
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
+  __ NoMonomorphicCheckedEntry();
+
   // Jump if receiver is a smi.
   Label smi_case;
   __ testq(RDI, Immediate(kSmiTagMask));
   // Jump out of line for smi case.
   __ j(ZERO, &smi_case, Assembler::kNearJump);
 
   // Loads the cid of the object.
   __ LoadClassId(RAX, RDI);
 
   Label cid_loaded;
@@ skipping 26 matching lines @@
   __ Bind(&load_target);
   // Call the target found in the cache.  For a class id match, this is a
   // proper target for the given name and arguments descriptor.  If the
   // illegal class id was found, the target is a cache miss handler that can
   // be invoked as a normal Dart function.
   __ movq(RAX, FieldAddress(RDI, RCX, TIMES_8, base + kWordSize));
   __ movq(R10,
           FieldAddress(RBX, MegamorphicCache::arguments_descriptor_offset()));
   __ movq(RCX, FieldAddress(RAX, Function::entry_point_offset()));
   __ movq(CODE_REG, FieldAddress(RAX, Function::code_offset()));
-
-  __ ret();
+  __ jmp(RCX);
 
   // Probe failed, check if it is a miss.
   __ Bind(&probe_failed);
   __ cmpq(FieldAddress(RDI, RCX, TIMES_8, base), Immediate(kIllegalCid));
   __ j(ZERO, &load_target, Assembler::kNearJump);
 
   // Try next extry in the table.
   __ AddImmediate(RCX, Immediate(Smi::RawValue(1)));
   __ jmp(&loop);
 
   // Load cid for the Smi case.
   __ Bind(&smi_case);
   __ movq(RAX, Immediate(kSmiCid));
   __ jmp(&cid_loaded);
 }
 
 
 // Called from switchable IC calls.
 //  RDI: receiver
 //  RBX: ICData (preserved)
 // Result:
-//  RCX: target entry point
 //  CODE_REG: target Code object
 //  R10: arguments descriptor
 void StubCode::GenerateICLookupThroughFunctionStub(Assembler* assembler) {
+  __ NoMonomorphicCheckedEntry();
+
   Label loop, found, miss;
 
   __ movq(R13, FieldAddress(RBX, ICData::ic_data_offset()));
   __ movq(R10, FieldAddress(RBX, ICData::arguments_descriptor_offset()));
   __ leaq(R13, FieldAddress(R13, Array::data_offset()));
   // R13: first IC entry
   __ LoadTaggedClassIdMayBeSmi(RAX, RDI);
   // RAX: receiver cid as Smi
 
   __ Bind(&loop);
   __ movq(R9, Address(R13, 0));
   __ cmpq(RAX, R9);
   __ j(EQUAL, &found, Assembler::kNearJump);
 
   ASSERT(Smi::RawValue(kIllegalCid) == 0);
   __ testq(R9, R9);
   __ j(ZERO, &miss, Assembler::kNearJump);
 
   const intptr_t entry_length = ICData::TestEntryLengthFor(1) * kWordSize;
   __ addq(R13, Immediate(entry_length));  // Next entry.
   __ jmp(&loop);
 
   __ Bind(&found);
   const intptr_t target_offset = ICData::TargetIndexFor(1) * kWordSize;
   __ movq(RAX, Address(R13, target_offset));
   __ movq(RCX, FieldAddress(RAX, Function::entry_point_offset()));
   __ movq(CODE_REG, FieldAddress(RAX, Function::code_offset()));
-  __ ret();
+  __ jmp(RCX);
 
   __ Bind(&miss);
   __ LoadIsolate(RAX);
   __ movq(CODE_REG, Address(RAX, Isolate::ic_miss_code_offset()));
   __ movq(RCX, FieldAddress(CODE_REG, Code::entry_point_offset()));
-  __ ret();
+  __ jmp(RCX);
 }
 
 
 void StubCode::GenerateICLookupThroughCodeStub(Assembler* assembler) {
+  __ NoMonomorphicCheckedEntry();
+
   Label loop, found, miss;
 
   __ movq(R13, FieldAddress(RBX, ICData::ic_data_offset()));
   __ movq(R10, FieldAddress(RBX, ICData::arguments_descriptor_offset()));
   __ leaq(R13, FieldAddress(R13, Array::data_offset()));
   // R13: first IC entry
   __ LoadTaggedClassIdMayBeSmi(RAX, RDI);
   // RAX: receiver cid as Smi
 
   __ Bind(&loop);
   __ movq(R9, Address(R13, 0));
   __ cmpq(RAX, R9);
   __ j(EQUAL, &found, Assembler::kNearJump);
 
   ASSERT(Smi::RawValue(kIllegalCid) == 0);
   __ testq(R9, R9);
   __ j(ZERO, &miss, Assembler::kNearJump);
 
   const intptr_t entry_length = ICData::TestEntryLengthFor(1) * kWordSize;
   __ addq(R13, Immediate(entry_length));  // Next entry.
   __ jmp(&loop);
 
   __ Bind(&found);
   const intptr_t code_offset = ICData::CodeIndexFor(1) * kWordSize;
   const intptr_t entry_offset = ICData::EntryPointIndexFor(1) * kWordSize;
   __ movq(RCX, Address(R13, entry_offset));
   __ movq(CODE_REG, Address(R13, code_offset));
-  __ ret();
+  __ jmp(RCX);
 
   __ Bind(&miss);
   __ LoadIsolate(RAX);
   __ movq(CODE_REG, Address(RAX, Isolate::ic_miss_code_offset()));
   __ movq(RCX, FieldAddress(CODE_REG, Code::entry_point_offset()));
-  __ ret();
+  __ jmp(RCX);
 }
 
 
+// Called from the monomorphic checked entry.
+//  RDI: receiver
+void StubCode::GenerateMonomorphicMissStub(Assembler* assembler) {
+  __ EnterStubFrame();
+  __ pushq(RDI);  // Preserve receiver.
+
+  __ PushObject(Object::null_object());  // Result.
+  __ pushq(RDI);                         // Arg0: Receiver
+  __ CallRuntime(kMonomorphicMissRuntimeEntry, 1);
+  __ popq(RBX);
+  __ popq(RBX);  // result = IC
+
+  __ popq(RDI);  // Restore receiver.
+  __ LeaveStubFrame();
+
+  __ movq(CODE_REG, Address(THR, Thread::ic_lookup_through_code_stub_offset()));
+  __ movq(RCX, FieldAddress(CODE_REG, Code::checked_entry_point_offset()));
+  __ jmp(RCX);
+}
+
+
 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64