Revert of Visit the Optimized Code Map on first call rather than closure creation.

src/arm64/builtins-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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 1159 matching lines @@
   // This simulates the initial call to bytecode handlers in interpreter entry
   // trampoline. The return will never actually be taken, but our stack walker
   // uses this address to determine whether a frame is interpreted.
   __ LoadObject(lr, masm->isolate()->builtins()->InterpreterEntryTrampoline());
 
   Generate_EnterBytecodeDispatch(masm);
 }
 
 
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- x0 : argument count (preserved for callee)
-  //  -- x3 : new target (preserved for callee)
-  //  -- x1 : target function (preserved for callee)
-  // -----------------------------------
-  // First lookup code, maybe we don't need to compile!
-  Label gotta_call_runtime;
-  Label maybe_call_runtime;
-  Label try_shared;
-  Label loop_top, loop_bottom;
-
-  Register closure = x1;
-  Register new_target = x3;
-  Register map = x13;
-  Register index = x2;
-  __ Ldr(map, FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
-  __ Ldr(map,
-         FieldMemOperand(map, SharedFunctionInfo::kOptimizedCodeMapOffset));
-  __ Ldrsw(index, UntagSmiFieldMemOperand(map, FixedArray::kLengthOffset));
-  __ Cmp(index, Operand(2));
-  __ B(lt, &gotta_call_runtime);
-
-  // Find literals.
-  // x3  : native context
-  // x2  : length / index
-  // x13 : optimized code map
-  // stack[0] : new target
-  // stack[4] : closure
-  Register native_context = x4;
-  __ Ldr(native_context, NativeContextMemOperand());
-
-  __ Bind(&loop_top);
-  Register temp = x5;
-  Register array_pointer = x6;
-
-  // Does the native context match?
-  __ Add(array_pointer, map, Operand(index, LSL, kPointerSizeLog2));
-  __ Ldr(temp, FieldMemOperand(array_pointer,
-                               SharedFunctionInfo::kOffsetToPreviousContext));
-  __ Ldr(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
-  __ Cmp(temp, native_context);
-  __ B(ne, &loop_bottom);
-  // OSR id set to none?
-  __ Ldr(temp, FieldMemOperand(array_pointer,
-                               SharedFunctionInfo::kOffsetToPreviousOsrAstId));
-  const int bailout_id = BailoutId::None().ToInt();
-  __ Cmp(temp, Operand(Smi::FromInt(bailout_id)));
-  __ B(ne, &loop_bottom);
-  // Literals available?
-  __ Ldr(temp, FieldMemOperand(array_pointer,
-                               SharedFunctionInfo::kOffsetToPreviousLiterals));
-  __ Ldr(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
-  __ JumpIfSmi(temp, &gotta_call_runtime);
-
-  // Save the literals in the closure.
-  __ Str(temp, FieldMemOperand(closure, JSFunction::kLiteralsOffset));
-  __ RecordWriteField(closure, JSFunction::kLiteralsOffset, temp, x7,
-                      kLRHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
-
-  // Code available?
-  Register entry = x7;
-  __ Ldr(entry,
-         FieldMemOperand(array_pointer,
-                         SharedFunctionInfo::kOffsetToPreviousCachedCode));
-  __ Ldr(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
-  __ JumpIfSmi(entry, &maybe_call_runtime);
-
-  // Found literals and code. Get them into the closure and return.
-  __ Add(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-
-  Label install_optimized_code_and_tailcall;
-  __ Bind(&install_optimized_code_and_tailcall);
-  __ Str(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset));
-  __ RecordWriteCodeEntryField(closure, entry, x5);
-
-  // Link the closure into the optimized function list.
-  // x7 : code entry
-  // x4 : native context
-  // x1 : closure
-  __ Ldr(x8,
-         ContextMemOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST));
-  __ Str(x8, FieldMemOperand(closure, JSFunction::kNextFunctionLinkOffset));
-  __ RecordWriteField(closure, JSFunction::kNextFunctionLinkOffset, x8, x13,
-                      kLRHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
-  const int function_list_offset =
-      Context::SlotOffset(Context::OPTIMIZED_FUNCTIONS_LIST);
-  __ Str(closure,
-         ContextMemOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST));
-  __ Mov(x5, closure);
-  __ RecordWriteContextSlot(native_context, function_list_offset, x5, x13,
-                            kLRHasNotBeenSaved, kDontSaveFPRegs);
-  __ Jump(entry);
-
-  __ Bind(&loop_bottom);
-  __ Sub(index, index, Operand(SharedFunctionInfo::kEntryLength));
-  __ Cmp(index, Operand(1));
-  __ B(gt, &loop_top);
-
-  // We found neither literals nor code.
-  __ B(&gotta_call_runtime);
-
-  __ Bind(&maybe_call_runtime);
-
-  // Last possibility. Check the context free optimized code map entry.
-  __ Ldr(entry, FieldMemOperand(map, FixedArray::kHeaderSize +
-                                         SharedFunctionInfo::kSharedCodeIndex));
-  __ Ldr(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
-  __ JumpIfSmi(entry, &try_shared);
-
-  // Store code entry in the closure.
-  __ Add(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-  __ B(&install_optimized_code_and_tailcall);
-
-  __ Bind(&try_shared);
-  // Is the full code valid?
-  __ Ldr(entry,
-         FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
-  __ Ldr(entry, FieldMemOperand(entry, SharedFunctionInfo::kCodeOffset));
-  __ Ldr(x5, FieldMemOperand(entry, Code::kFlagsOffset));
-  __ and_(x5, x5, Operand(Code::KindField::kMask));
-  __ Mov(x5, Operand(x5, LSR, Code::KindField::kShift));
-  __ Cmp(x5, Operand(Code::BUILTIN));
-  __ B(eq, &gotta_call_runtime);
-  // Yes, install the full code.
-  __ Add(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-  __ Str(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset));
-  __ RecordWriteCodeEntryField(closure, entry, x5);
-  __ Jump(entry);
-
-  __ Bind(&gotta_call_runtime);
   GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
 }
 
 
 void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
   GenerateTailCallToReturnedCode(masm,
                                  Runtime::kCompileOptimized_NotConcurrent);
 }
 
 
@@ skipping 1568 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM