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

src/mips/builtins-mips.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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1208 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.
   __ li(ra, Operand(masm->isolate()->builtins()->InterpreterEntryTrampoline()));
 
   Generate_EnterBytecodeDispatch(masm);
 }
 
 
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- a0 : argument count (preserved for callee)
-  //  -- a3 : new target (preserved for callee)
-  //  -- a1 : target function (preserved for callee)
-  // -----------------------------------
-  // First lookup code, maybe we don't need to compile!
-  Label gotta_call_runtime, gotta_call_runtime_no_stack;
-  Label maybe_call_runtime;
-  Label try_shared;
-  Label loop_top, loop_bottom;
-
-  Register argument_count = a0;
-  Register closure = a1;
-  Register new_target = a3;
-  __ push(argument_count);
-  __ push(new_target);
-  __ push(closure);
-
-  Register map = a0;
-  Register index = a2;
-  __ lw(map, FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
-  __ lw(map, FieldMemOperand(map, SharedFunctionInfo::kOptimizedCodeMapOffset));
-  __ lw(index, FieldMemOperand(map, FixedArray::kLengthOffset));
-  __ Branch(&gotta_call_runtime, lt, index, Operand(Smi::FromInt(2)));
-
-  // Find literals.
-  // a3  : native context
-  // a2  : length / index
-  // a0  : optimized code map
-  // stack[0] : new target
-  // stack[4] : closure
-  Register native_context = a3;
-  __ lw(native_context, NativeContextMemOperand());
-
-  __ bind(&loop_top);
-  Register temp = a1;
-  Register array_pointer = t1;
-
-  // Does the native context match?
-  __ sll(at, index, kPointerSizeLog2 - kSmiTagSize);
-  __ Addu(array_pointer, map, Operand(at));
-  __ lw(temp, FieldMemOperand(array_pointer,
-                              SharedFunctionInfo::kOffsetToPreviousContext));
-  __ lw(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
-  __ Branch(&loop_bottom, ne, temp, Operand(native_context));
-  // OSR id set to none?
-  __ lw(temp, FieldMemOperand(array_pointer,
-                              SharedFunctionInfo::kOffsetToPreviousOsrAstId));
-  const int bailout_id = BailoutId::None().ToInt();
-  __ Branch(&loop_bottom, ne, temp, Operand(Smi::FromInt(bailout_id)));
-  // Literals available?
-  __ lw(temp, FieldMemOperand(array_pointer,
-                              SharedFunctionInfo::kOffsetToPreviousLiterals));
-  __ lw(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
-  __ JumpIfSmi(temp, &gotta_call_runtime);
-
-  // Save the literals in the closure.
-  __ lw(t0, MemOperand(sp, 0));
-  __ sw(temp, FieldMemOperand(t0, JSFunction::kLiteralsOffset));
-  __ push(index);
-  __ RecordWriteField(t0, JSFunction::kLiteralsOffset, temp, index,
-                      kRAHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
-  __ pop(index);
-
-  // Code available?
-  Register entry = t0;
-  __ lw(entry,
-        FieldMemOperand(array_pointer,
-                        SharedFunctionInfo::kOffsetToPreviousCachedCode));
-  __ lw(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
-  __ JumpIfSmi(entry, &maybe_call_runtime);
-
-  // Found literals and code. Get them into the closure and return.
-  __ pop(closure);
-  // Store code entry in the closure.
-  __ Addu(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-
-  Label install_optimized_code_and_tailcall;
-  __ bind(&install_optimized_code_and_tailcall);
-  __ sw(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset));
-  __ RecordWriteCodeEntryField(closure, entry, t1);
-
-  // Link the closure into the optimized function list.
-  // t0 : code entry
-  // a3 : native context
-  // a1 : closure
-  __ lw(t1,
-        ContextMemOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST));
-  __ sw(t1, FieldMemOperand(closure, JSFunction::kNextFunctionLinkOffset));
-  __ RecordWriteField(closure, JSFunction::kNextFunctionLinkOffset, t1, a0,
-                      kRAHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
-  const int function_list_offset =
-      Context::SlotOffset(Context::OPTIMIZED_FUNCTIONS_LIST);
-  __ sw(closure,
-        ContextMemOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST));
-  // Save closure before the write barrier.
-  __ mov(t1, closure);
-  __ RecordWriteContextSlot(native_context, function_list_offset, closure, a0,
-                            kRAHasNotBeenSaved, kDontSaveFPRegs);
-  __ mov(closure, t1);
-  __ pop(new_target);
-  __ pop(argument_count);
-  __ Jump(entry);
-
-  __ bind(&loop_bottom);
-  __ Subu(index, index,
-          Operand(Smi::FromInt(SharedFunctionInfo::kEntryLength)));
-  __ Branch(&loop_top, gt, index, Operand(Smi::FromInt(1)));
-
-  // We found neither literals nor code.
-  __ jmp(&gotta_call_runtime);
-
-  __ bind(&maybe_call_runtime);
-  __ pop(closure);
-
-  // Last possibility. Check the context free optimized code map entry.
-  __ lw(entry, FieldMemOperand(map, FixedArray::kHeaderSize +
-                                        SharedFunctionInfo::kSharedCodeIndex));
-  __ lw(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
-  __ JumpIfSmi(entry, &try_shared);
-
-  // Store code entry in the closure.
-  __ Addu(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-  __ jmp(&install_optimized_code_and_tailcall);
-
-  __ bind(&try_shared);
-  __ pop(new_target);
-  __ pop(argument_count);
-  // Is the full code valid?
-  __ lw(entry, FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
-  __ lw(entry, FieldMemOperand(entry, SharedFunctionInfo::kCodeOffset));
-  __ lw(t1, FieldMemOperand(entry, Code::kFlagsOffset));
-  __ And(t1, t1, Operand(Code::KindField::kMask));
-  __ srl(t1, t1, Code::KindField::kShift);
-  __ Branch(&gotta_call_runtime_no_stack, eq, t1, Operand(Code::BUILTIN));
-  // Yes, install the full code.
-  __ Addu(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
-  __ sw(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset));
-  __ RecordWriteCodeEntryField(closure, entry, t1);
-  __ Jump(entry);
-
-  __ bind(&gotta_call_runtime);
-  __ pop(closure);
-  __ pop(new_target);
-  __ pop(argument_count);
-  __ bind(&gotta_call_runtime_no_stack);
   GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
 }
 
 
 void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
   GenerateTailCallToReturnedCode(masm,
                                  Runtime::kCompileOptimized_NotConcurrent);
 }
 
 
@@ skipping 1469 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS