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

src/ia32/builtins-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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 824 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.
   __ Push(masm->isolate()->builtins()->InterpreterEntryTrampoline());
 
   Generate_EnterBytecodeDispatch(masm);
 }
 
 
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- eax : argument count (preserved for callee)
+  //  -- edx : new target (preserved for callee)
+  //  -- edi : 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 closure = edi;
+  Register new_target = edx;
+  Register argument_count = eax;
+
+  __ push(argument_count);
+  __ push(new_target);
+  __ push(closure);
+
+  Register map = argument_count;
+  Register index = ebx;
+  __ mov(map, FieldOperand(closure, JSFunction::kSharedFunctionInfoOffset));
+  __ mov(map, FieldOperand(map, SharedFunctionInfo::kOptimizedCodeMapOffset));
+  __ mov(index, FieldOperand(map, FixedArray::kLengthOffset));
+  __ cmp(index, Immediate(Smi::FromInt(2)));
+  __ j(less, &gotta_call_runtime);
+
+  // Find literals.
+  // edx : native context
+  // ebx : length / index
+  // eax : optimized code map
+  // stack[0] : new target
+  // stack[4] : closure
+  Register native_context = edx;
+  __ mov(native_context, NativeContextOperand());
+
+  __ bind(&loop_top);
+  Register temp = edi;
+
+  // Does the native context match?
+  __ mov(temp, FieldOperand(map, index, times_half_pointer_size,
+                            SharedFunctionInfo::kOffsetToPreviousContext));
+  __ mov(temp, FieldOperand(temp, WeakCell::kValueOffset));
+  __ cmp(temp, native_context);
+  __ j(not_equal, &loop_bottom);
+  // OSR id set to none?
+  __ mov(temp, FieldOperand(map, index, times_half_pointer_size,
+                            SharedFunctionInfo::kOffsetToPreviousOsrAstId));
+  const int bailout_id = BailoutId::None().ToInt();
+  __ cmp(temp, Immediate(Smi::FromInt(bailout_id)));
+  __ j(not_equal, &loop_bottom);
+  // Literals available?
+  __ mov(temp, FieldOperand(map, index, times_half_pointer_size,
+                            SharedFunctionInfo::kOffsetToPreviousLiterals));
+  __ mov(temp, FieldOperand(temp, WeakCell::kValueOffset));
+  __ JumpIfSmi(temp, &gotta_call_runtime);
+
+  // Save the literals in the closure.
+  __ mov(ecx, Operand(esp, 0));
+  __ mov(FieldOperand(ecx, JSFunction::kLiteralsOffset), temp);
+  __ push(index);
+  __ RecordWriteField(ecx, JSFunction::kLiteralsOffset, temp, index,
+                      kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
+  __ pop(index);
+
+  // Code available?
+  Register entry = ecx;
+  __ mov(entry, FieldOperand(map, index, times_half_pointer_size,
+                             SharedFunctionInfo::kOffsetToPreviousCachedCode));
+  __ mov(entry, FieldOperand(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.
+  __ lea(entry, FieldOperand(entry, Code::kHeaderSize));
+
+  Label install_optimized_code_and_tailcall;
+  __ bind(&install_optimized_code_and_tailcall);
+  __ mov(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
+  __ RecordWriteCodeEntryField(closure, entry, eax);
+
+  // Link the closure into the optimized function list.
+  // ecx : code entry
+  // edx : native context
+  // edi : closure
+  __ mov(ebx,
+         ContextOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST));
+  __ mov(FieldOperand(closure, JSFunction::kNextFunctionLinkOffset), ebx);
+  __ RecordWriteField(closure, JSFunction::kNextFunctionLinkOffset, ebx, eax,
+                      kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
+  const int function_list_offset =
+      Context::SlotOffset(Context::OPTIMIZED_FUNCTIONS_LIST);
+  __ mov(ContextOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST),
+         closure);
+  // Save closure before the write barrier.
+  __ mov(ebx, closure);
+  __ RecordWriteContextSlot(native_context, function_list_offset, closure, eax,
+                            kDontSaveFPRegs);
+  __ mov(closure, ebx);
+  __ pop(new_target);
+  __ pop(argument_count);
+  __ jmp(entry);
+
+  __ bind(&loop_bottom);
+  __ sub(index, Immediate(Smi::FromInt(SharedFunctionInfo::kEntryLength)));
+  __ cmp(index, Immediate(Smi::FromInt(1)));
+  __ j(greater, &loop_top);
+
+  // 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.
+  __ mov(entry, FieldOperand(map, FixedArray::kHeaderSize +
+                                      SharedFunctionInfo::kSharedCodeIndex));
+  __ mov(entry, FieldOperand(entry, WeakCell::kValueOffset));
+  __ JumpIfSmi(entry, &try_shared);
+
+  // Store code entry in the closure.
+  __ lea(entry, FieldOperand(entry, Code::kHeaderSize));
+  __ jmp(&install_optimized_code_and_tailcall);
+
+  __ bind(&try_shared);
+  __ pop(new_target);
+  __ pop(argument_count);
+  // Is the full code valid?
+  __ mov(entry, FieldOperand(closure, JSFunction::kSharedFunctionInfoOffset));
+  __ mov(entry, FieldOperand(entry, SharedFunctionInfo::kCodeOffset));
+  __ mov(ebx, FieldOperand(entry, Code::kFlagsOffset));
+  __ and_(ebx, Code::KindField::kMask);
+  __ shr(ebx, Code::KindField::kShift);
+  __ cmp(ebx, Immediate(Code::BUILTIN));
+  __ j(equal, &gotta_call_runtime_no_stack);
+  // Yes, install the full code.
+  __ lea(entry, FieldOperand(entry, Code::kHeaderSize));
+  __ mov(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
+  __ RecordWriteCodeEntryField(closure, entry, ebx);
+  __ jmp(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 1867 matching lines @@
   // And "return" to the OSR entry point of the function.
   __ ret(0);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32