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Commit ef2f091f authored by Leszek Swirski's avatar Leszek Swirski Committed by Commit Bot
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[ignition] Avoid possible unnecessary Mov around GetIterator 

Wrap the obj and method registers in BuildGetIterator in a register
allocation scope, so that they don't get materialised before the
JumpIfJSReceiver jump if they don't have to.

Bug: v8:9649
Change-Id: I8dfdd06a23c396124c495b5cb83c078080f1a7c9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1768583
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: 's avatarGeorg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63393}
parent 02becb16
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Showing with 976 additions and 979 deletions
src/interpreter/bytecode-generator.cc
View file @ ef2f091f
...@@ -14,6 +14,7 @@ ...@@ -14,6 +14,7 @@
#include "src/interpreter/bytecode-jump-table.h" #include "src/interpreter/bytecode-jump-table.h"
#include "src/interpreter/bytecode-label.h" #include "src/interpreter/bytecode-label.h"
#include "src/interpreter/bytecode-register-allocator.h" #include "src/interpreter/bytecode-register-allocator.h"
#include "src/interpreter/bytecode-register.h"
#include "src/interpreter/control-flow-builders.h" #include "src/interpreter/control-flow-builders.h"
#include "src/logging/log.h" #include "src/logging/log.h"
#include "src/objects/debug-objects.h" #include "src/objects/debug-objects.h"
...@@ -5300,11 +5301,12 @@ void BytecodeGenerator::VisitImportCallExpression(ImportCallExpression* expr) { ...@@ -5300,11 +5301,12 @@ void BytecodeGenerator::VisitImportCallExpression(ImportCallExpression* expr) {
} }
void BytecodeGenerator::BuildGetIterator(IteratorType hint) { void BytecodeGenerator::BuildGetIterator(IteratorType hint) {
RegisterList args = register_allocator()->NewRegisterList(1);
Register method = register_allocator()->NewRegister();
Register obj = args[0];
if (hint == IteratorType::kAsync) { if (hint == IteratorType::kAsync) {
RegisterAllocationScope scope(this);
Register obj = register_allocator()->NewRegister();
Register method = register_allocator()->NewRegister();
// Set method to GetMethod(obj, @@asyncIterator) // Set method to GetMethod(obj, @@asyncIterator)
builder()->StoreAccumulatorInRegister(obj).LoadAsyncIteratorProperty( builder()->StoreAccumulatorInRegister(obj).LoadAsyncIteratorProperty(
obj, feedback_index(feedback_spec()->AddLoadICSlot())); obj, feedback_index(feedback_spec()->AddLoadICSlot()));
...@@ -5314,7 +5316,8 @@ void BytecodeGenerator::BuildGetIterator(IteratorType hint) { ...@@ -5314,7 +5316,8 @@ void BytecodeGenerator::BuildGetIterator(IteratorType hint) {
// Let iterator be Call(method, obj) // Let iterator be Call(method, obj)
builder()->StoreAccumulatorInRegister(method).CallProperty( builder()->StoreAccumulatorInRegister(method).CallProperty(
method, args, feedback_index(feedback_spec()->AddCallICSlot())); method, RegisterList(obj),
feedback_index(feedback_spec()->AddCallICSlot()));
// If Type(iterator) is not Object, throw a TypeError exception. // If Type(iterator) is not Object, throw a TypeError exception.
builder()->JumpIfJSReceiver(&done); builder()->JumpIfJSReceiver(&done);
...@@ -5328,7 +5331,7 @@ void BytecodeGenerator::BuildGetIterator(IteratorType hint) { ...@@ -5328,7 +5331,7 @@ void BytecodeGenerator::BuildGetIterator(IteratorType hint) {
.StoreAccumulatorInRegister(method); .StoreAccumulatorInRegister(method);
// Let syncIterator be Call(syncMethod, obj) // Let syncIterator be Call(syncMethod, obj)
builder()->CallProperty(method, args, builder()->CallProperty(method, RegisterList(obj),
feedback_index(feedback_spec()->AddCallICSlot())); feedback_index(feedback_spec()->AddCallICSlot()));
// Return CreateAsyncFromSyncIterator(syncIterator) // Return CreateAsyncFromSyncIterator(syncIterator)
...@@ -5339,15 +5342,22 @@ void BytecodeGenerator::BuildGetIterator(IteratorType hint) { ...@@ -5339,15 +5342,22 @@ void BytecodeGenerator::BuildGetIterator(IteratorType hint) {
builder()->Bind(&done); builder()->Bind(&done);
} else { } else {
// Let method be GetMethod(obj, @@iterator). {
builder() RegisterAllocationScope scope(this);
->StoreAccumulatorInRegister(obj)
.GetIterator(obj, feedback_index(feedback_spec()->AddLoadICSlot()))
.StoreAccumulatorInRegister(method);
// Let iterator be Call(method, obj). Register obj = register_allocator()->NewRegister();
builder()->CallProperty(method, args, Register method = register_allocator()->NewRegister();
feedback_index(feedback_spec()->AddCallICSlot()));
// Let method be GetMethod(obj, @@iterator).
builder()
->StoreAccumulatorInRegister(obj)
.GetIterator(obj, feedback_index(feedback_spec()->AddLoadICSlot()))
.StoreAccumulatorInRegister(method);
// Let iterator be Call(method, obj).
builder()->CallProperty(method, RegisterList(obj),
feedback_index(feedback_spec()->AddCallICSlot()));
}
// If Type(iterator) is not Object, throw a TypeError exception. // If Type(iterator) is not Object, throw a TypeError exception.
BytecodeLabel no_type_error; BytecodeLabel no_type_error;
......
test/cctest/interpreter/bytecode_expectations/ArrayLiterals.golden
View file @ ef2f091f
...@@ -141,9 +141,9 @@ handlers: [ ...@@ -141,9 +141,9 @@ handlers: [
snippet: " snippet: "
var a = [ 1, 2 ]; return [ 0, ...a ]; var a = [ 1, 2 ]; return [ 0, ...a ];
" "
frame size: 8 frame size: 7
parameter count: 1 parameter count: 1
bytecode array length: 83 bytecode array length: 80
bytecodes: [ bytecodes: [
/* 30 E> */ B(StackCheck), /* 30 E> */ B(StackCheck),
/* 42 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(37), /* 42 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(37),
...@@ -155,19 +155,18 @@ bytecodes: [ ...@@ -155,19 +155,18 @@ bytecodes: [
B(GetIterator), R(0), U8(2), B(GetIterator), R(0), U8(2),
B(Star), R(6), B(Star), R(6),
B(CallProperty0), R(6), R(0), U8(4), B(CallProperty0), R(6), R(0), U8(4),
B(Mov), R(0), R(5),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0), B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
B(Star), R(4), B(Star), R(4),
B(LdaNamedProperty), R(4), U8(3), U8(6), B(LdaNamedProperty), R(4), U8(3), U8(6),
B(Star), R(3), B(Star), R(3),
B(CallProperty0), R(3), R(4), U8(15), B(CallProperty0), R(3), R(4), U8(15),
B(Star), R(7), B(Star), R(5),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1), B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
B(LdaNamedProperty), R(7), U8(4), U8(17), B(LdaNamedProperty), R(5), U8(4), U8(17),
B(JumpIfToBooleanTrue), U8(19), B(JumpIfToBooleanTrue), U8(19),
B(LdaNamedProperty), R(7), U8(5), U8(8), B(LdaNamedProperty), R(5), U8(5), U8(8),
B(StaInArrayLiteral), R(2), R(1), U8(13), B(StaInArrayLiteral), R(2), R(1), U8(13),
B(Ldar), R(1), B(Ldar), R(1),
B(Inc), U8(12), B(Inc), U8(12),
......
test/cctest/interpreter/bytecode_expectations/CallAndSpread.golden
View file @ ef2f091f
...@@ -65,7 +65,7 @@ handlers: [ ...@@ -65,7 +65,7 @@ handlers: [
snippet: " snippet: "
Math.max(0, ...[1, 2, 3], 4); Math.max(0, ...[1, 2, 3], 4);
" "
frame size: 10 frame size: 9
parameter count: 1 parameter count: 1
bytecode array length: 106 bytecode array length: 106
bytecodes: [ bytecodes: [
...@@ -90,12 +90,12 @@ bytecodes: [ ...@@ -90,12 +90,12 @@ bytecodes: [
B(LdaNamedProperty), R(6), U8(5), U8(10), B(LdaNamedProperty), R(6), U8(5), U8(10),
B(Star), R(5), B(Star), R(5),
B(CallProperty0), R(5), R(6), U8(19), B(CallProperty0), R(5), R(6), U8(19),
B(Star), R(9), B(Star), R(7),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1), B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
B(LdaNamedProperty), R(9), U8(6), U8(21), B(LdaNamedProperty), R(7), U8(6), U8(21),
B(JumpIfToBooleanTrue), U8(19), B(JumpIfToBooleanTrue), U8(19),
B(LdaNamedProperty), R(9), U8(7), U8(12), B(LdaNamedProperty), R(7), U8(7), U8(12),
B(StaInArrayLiteral), R(4), R(3), U8(17), B(StaInArrayLiteral), R(4), R(3), U8(17),
B(Ldar), R(3), B(Ldar), R(3),
B(Inc), U8(16), B(Inc), U8(16),
......
test/cctest/interpreter/bytecode_expectations/Generators.golden
View file @ ef2f091f
...@@ -98,7 +98,7 @@ snippet: " ...@@ -98,7 +98,7 @@ snippet: "
function* f() { for (let x of [42]) yield x } function* f() { for (let x of [42]) yield x }
f(); f();
" "
frame size: 17 frame size: 15
parameter count: 1 parameter count: 1
bytecode array length: 258 bytecode array length: 258
bytecodes: [ bytecodes: [
...@@ -128,83 +128,83 @@ bytecodes: [ ...@@ -128,83 +128,83 @@ bytecodes: [
B(LdaNamedProperty), R(5), U8(5), U8(5), B(LdaNamedProperty), R(5), U8(5), U8(5),
B(Star), R(4), B(Star), R(4),
B(LdaFalse), B(LdaFalse),
B(Star), R(8), B(Star), R(6),
B(Mov), R(context), R(11), B(Mov), R(context), R(9),
B(LdaTrue), B(LdaTrue),
B(Star), R(8), B(Star), R(6),
/* 25 S> */ B(CallProperty0), R(4), R(5), U8(7), /* 25 S> */ B(CallProperty0), R(4), R(5), U8(7),
B(Star), R(12), B(Star), R(10),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(12), U8(1), B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
B(LdaNamedProperty), R(12), U8(6), U8(9), B(LdaNamedProperty), R(10), U8(6), U8(9),
B(JumpIfToBooleanTrue), U8(64), B(JumpIfToBooleanTrue), U8(64),
B(LdaNamedProperty), R(12), U8(7), U8(11), B(LdaNamedProperty), R(10), U8(7), U8(11),
B(Star), R(12), B(Star), R(10),
B(LdaFalse), B(LdaFalse),
B(Star), R(8), B(Star), R(6),
B(Mov), R(12), R(1), B(Mov), R(10), R(1),
/* 16 E> */ B(StackCheck), /* 16 E> */ B(StackCheck),
/* 25 S> */ B(Mov), R(1), R(3), /* 25 S> */ B(Mov), R(1), R(3),
/* 36 S> */ B(LdaFalse), /* 36 S> */ B(LdaFalse),
B(Star), R(14), B(Star), R(12),
B(Mov), R(3), R(13), B(Mov), R(3), R(11),
B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(13), U8(2), B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(11), U8(2),
/* 36 E> */ B(SuspendGenerator), R(0), R(0), U8(13), U8(1), /* 36 E> */ B(SuspendGenerator), R(0), R(0), U8(11), U8(1),
B(ResumeGenerator), R(0), R(0), U8(13), B(ResumeGenerator), R(0), R(0), U8(11),
B(Star), R(13), B(Star), R(11),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1), B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
B(SwitchOnSmiNoFeedback), U8(8), U8(2), I8(0), B(SwitchOnSmiNoFeedback), U8(8), U8(2), I8(0),
B(Ldar), R(13), B(Ldar), R(11),
/* 36 E> */ B(Throw), /* 36 E> */ B(Throw),
B(LdaSmi), I8(1), B(LdaSmi), I8(1),
B(Star), R(9), B(Star), R(7),
B(Mov), R(13), R(10), B(Mov), R(11), R(8),
B(Jump), U8(20), B(Jump), U8(20),
B(Ldar), R(13), B(Ldar), R(11),
B(JumpLoop), U8(81), I8(0), B(JumpLoop), U8(81), I8(0),
B(LdaSmi), I8(-1), B(LdaSmi), I8(-1),
B(Star), R(10), B(Star), R(8),
B(Star), R(9), B(Star), R(7),
B(Jump), U8(7), B(Jump), U8(7),
B(Star), R(10), B(Star), R(8),
B(LdaZero), B(LdaZero),
B(Star), R(9), B(Star), R(7),
B(LdaTheHole), B(LdaTheHole),
B(SetPendingMessage), B(SetPendingMessage),
B(Star), R(11), B(Star), R(9),
B(Ldar), R(8), B(Ldar), R(6),
B(JumpIfToBooleanTrue), U8(58), B(JumpIfToBooleanTrue), U8(58),
B(LdaNamedProperty), R(5), U8(10), U8(13), B(LdaNamedProperty), R(5), U8(10), U8(13),
B(Star), R(13), B(Star), R(11),
B(JumpIfUndefinedOrNull), U8(50), B(JumpIfUndefinedOrNull), U8(50),
B(Mov), R(context), R(14), B(Mov), R(context), R(12),
B(TestTypeOf), U8(6), B(TestTypeOf), U8(6),
B(JumpIfTrue), U8(18), B(JumpIfTrue), U8(18),
B(Wide), B(LdaSmi), I16(159), B(Wide), B(LdaSmi), I16(159),
B(Star), R(15), B(Star), R(13),
B(LdaConstant), U8(11), B(LdaConstant), U8(11),
B(Star), R(16), B(Star), R(14),
B(CallRuntime), U16(Runtime::kNewTypeError), R(15), U8(2), B(CallRuntime), U16(Runtime::kNewTypeError), R(13), U8(2),
B(Throw), B(Throw),
B(CallProperty0), R(13), R(5), U8(15), B(CallProperty0), R(11), R(5), U8(15),
B(JumpIfJSReceiver), U8(21), B(JumpIfJSReceiver), U8(21),
B(Star), R(15), B(Star), R(13),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(15), U8(1), B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(13), U8(1),
B(Jump), U8(12), B(Jump), U8(12),
B(Star), R(14), B(Star), R(12),
B(LdaZero), B(LdaZero),
B(TestReferenceEqual), R(9), B(TestReferenceEqual), R(7),
B(JumpIfTrue), U8(5), B(JumpIfTrue), U8(5),
B(Ldar), R(14), B(Ldar), R(12),
B(ReThrow), B(ReThrow),
B(Ldar), R(11),
B(SetPendingMessage),
B(Ldar), R(9), B(Ldar), R(9),
B(SetPendingMessage),
B(Ldar), R(7),
B(SwitchOnSmiNoFeedback), U8(12), U8(2), I8(0), B(SwitchOnSmiNoFeedback), U8(12), U8(2), I8(0),
B(Jump), U8(8), B(Jump), U8(8),
B(Ldar), R(10), B(Ldar), R(8),
B(ReThrow), B(ReThrow),
B(Ldar), R(10), B(Ldar), R(8),
/* 44 S> */ B(Return), /* 44 S> */ B(Return),
B(LdaUndefined), B(LdaUndefined),
/* 44 S> */ B(Return), /* 44 S> */ B(Return),
...@@ -236,7 +236,7 @@ snippet: " ...@@ -236,7 +236,7 @@ snippet: "
function* f() { yield* g() } function* f() { yield* g() }
f(); f();
" "
frame size: 9 frame size: 8
parameter count: 1 parameter count: 1
bytecode array length: 210 bytecode array length: 210
bytecodes: [ bytecodes: [
...@@ -277,24 +277,24 @@ bytecodes: [ ...@@ -277,24 +277,24 @@ bytecodes: [
B(Jump), U8(63), B(Jump), U8(63),
B(LdaNamedProperty), R(3), U8(8), U8(12), B(LdaNamedProperty), R(3), U8(8), U8(12),
B(JumpIfUndefinedOrNull), U8(11), B(JumpIfUndefinedOrNull), U8(11),
B(Star), R(8), B(Star), R(6),
B(CallProperty1), R(8), R(3), R(4), U8(14), B(CallProperty1), R(6), R(3), R(4), U8(14),
B(Jump), U8(48), B(Jump), U8(48),
B(Ldar), R(4), B(Ldar), R(4),
/* 54 S> */ B(Return), /* 54 S> */ B(Return),
B(LdaNamedProperty), R(3), U8(9), U8(16), B(LdaNamedProperty), R(3), U8(9), U8(16),
B(JumpIfUndefinedOrNull), U8(11), B(JumpIfUndefinedOrNull), U8(11),
B(Star), R(8), B(Star), R(6),
B(CallProperty1), R(8), R(3), R(4), U8(18), B(CallProperty1), R(6), R(3), R(4), U8(18),
B(Jump), U8(30), B(Jump), U8(30),
B(LdaNamedProperty), R(3), U8(8), U8(20), B(LdaNamedProperty), R(3), U8(8), U8(20),
B(JumpIfUndefinedOrNull), U8(19), B(JumpIfUndefinedOrNull), U8(19),
B(Star), R(8), B(Star), R(6),
B(CallProperty0), R(8), R(3), U8(22), B(CallProperty0), R(6), R(3), U8(22),
B(Jump), U8(2), B(Jump), U8(2),
B(JumpIfJSReceiver), U8(9), B(JumpIfJSReceiver), U8(9),
B(Star), R(8), B(Star), R(6),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1), B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
B(CallRuntime), U16(Runtime::kThrowThrowMethodMissing), R(0), U8(0), B(CallRuntime), U16(Runtime::kThrowThrowMethodMissing), R(0), U8(0),
B(Star), R(1), B(Star), R(1),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
...@@ -302,8 +302,8 @@ bytecodes: [ ...@@ -302,8 +302,8 @@ bytecodes: [
B(LdaNamedProperty), R(1), U8(10), U8(24), B(LdaNamedProperty), R(1), U8(10), U8(24),
B(JumpIfToBooleanTrue), U8(24), B(JumpIfToBooleanTrue), U8(24),
B(Ldar), R(1), B(Ldar), R(1),
/* 43 E> */ B(SuspendGenerator), R(0), R(0), U8(8), U8(1), /* 43 E> */ B(SuspendGenerator), R(0), R(0), U8(6), U8(1),
B(ResumeGenerator), R(0), R(0), U8(8), B(ResumeGenerator), R(0), R(0), U8(6),
B(Star), R(4), B(Star), R(4),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1), B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
B(Star), R(2), B(Star), R(2),
......
test/cctest/interpreter/bytecode_expectations/NewAndSpread.golden
View file @ ef2f091f
...@@ -92,7 +92,7 @@ snippet: " ...@@ -92,7 +92,7 @@ snippet: "
class A { constructor(...args) { this.args = args; } } class A { constructor(...args) { this.args = args; } }
new A(0, ...[1, 2, 3], 4); new A(0, ...[1, 2, 3], 4);
" "
frame size: 10 frame size: 9
parameter count: 1 parameter count: 1
bytecode array length: 130 bytecode array length: 130
bytecodes: [ bytecodes: [
...@@ -127,12 +127,12 @@ bytecodes: [ ...@@ -127,12 +127,12 @@ bytecodes: [
B(LdaNamedProperty), R(6), U8(6), U8(6), B(LdaNamedProperty), R(6), U8(6), U8(6),
B(Star), R(5), B(Star), R(5),
B(CallProperty0), R(5), R(6), U8(15), B(CallProperty0), R(5), R(6), U8(15),
B(Star), R(9), B(Star), R(7),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1), B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
B(LdaNamedProperty), R(9), U8(7), U8(17), B(LdaNamedProperty), R(7), U8(7), U8(17),
B(JumpIfToBooleanTrue), U8(19), B(JumpIfToBooleanTrue), U8(19),
B(LdaNamedProperty), R(9), U8(8), U8(8), B(LdaNamedProperty), R(7), U8(8), U8(8),
B(StaInArrayLiteral), R(4), R(3), U8(13), B(StaInArrayLiteral), R(4), R(3), U8(13),
B(Ldar), R(3), B(Ldar), R(3),
B(Inc), U8(12), B(Inc), U8(12),
......
test/cctest/interpreter/bytecode_expectations/SuperCallAndSpread.golden
View file @ ef2f091f
...@@ -91,9 +91,9 @@ snippet: " ...@@ -91,9 +91,9 @@ snippet: "
test = new B(1, 2, 3).constructor; test = new B(1, 2, 3).constructor;
})(); })();
" "
frame size: 13 frame size: 12
parameter count: 1 parameter count: 1
bytecode array length: 127 bytecode array length: 124
bytecodes: [ bytecodes: [
B(CreateRestParameter), B(CreateRestParameter),
B(Star), R(3), B(Star), R(3),
...@@ -114,7 +114,6 @@ bytecodes: [ ...@@ -114,7 +114,6 @@ bytecodes: [
B(GetIterator), R(3), U8(4), B(GetIterator), R(3), U8(4),
B(Star), R(11), B(Star), R(11),
B(CallProperty0), R(11), R(3), U8(6), B(CallProperty0), R(11), R(3), U8(6),
B(Mov), R(3), R(10),
B(Mov), R(1), R(4), B(Mov), R(1), R(4),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0), B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
...@@ -122,12 +121,12 @@ bytecodes: [ ...@@ -122,12 +121,12 @@ bytecodes: [
B(LdaNamedProperty), R(9), U8(0), U8(8), B(LdaNamedProperty), R(9), U8(0), U8(8),
B(Star), R(8), B(Star), R(8),
B(CallProperty0), R(8), R(9), U8(14), B(CallProperty0), R(8), R(9), U8(14),
B(Star), R(12), B(Star), R(10),
B(JumpIfJSReceiver), U8(7), B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(12), U8(1), B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
B(LdaNamedProperty), R(12), U8(1), U8(16), B(LdaNamedProperty), R(10), U8(1), U8(16),
B(JumpIfToBooleanTrue), U8(19), B(JumpIfToBooleanTrue), U8(19),
B(LdaNamedProperty), R(12), U8(2), U8(10), B(LdaNamedProperty), R(10), U8(2), U8(10),
B(StaInArrayLiteral), R(7), R(6), U8(1), B(StaInArrayLiteral), R(7), R(6), U8(1),
B(Ldar), R(6), B(Ldar), R(6),
B(Inc), U8(3), B(Inc), U8(3),
......
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