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2d889aa9a4
v8/test/cctest/interpreter/bytecode_expectations/Generators.golden
Caitlin Potter 2d889aa9a4 Reland "[esnext] load iterator.next only once at beginning of iteration" 
https://github.com/tc39/ecma262/pull/988 gained concensus during the
september 2017 TC39 meetings. This moves the load of the "next" method
to the very beginning of the iteration protocol, rather than during
each iteration step.

This impacts:

- yield*
- for-of loops
- spread arguments
- array spreads

In the v8 implementation, this also affects async iteration versions of
these things (the sole exception being the Async-From-Sync iterator,
which requires a few more changes to work with this, likely done in a
followup patch).

This change introduces a new AST node, ResolvedProperty, which can be used
as a callee by Call nodes to produce the same bytecode as Property calls,
without observably re-loading the property. This is used in several
AST-desugarings involving the iteration protocol.

BUG=v8:6861, v8:5699
R=rmcilroy@chromium.org
TBR=neis@chromium.org, adamk@chromium.org

Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I9685db6e85315ba8a2df87a4537c2bf491e1e35b
Reviewed-on: https://chromium-review.googlesource.com/857593
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50518}
2018-01-11 20:27:13 +00:00

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#
# Autogenerated by generate-bytecode-expectations.
#
---
wrap: no
test function name: f
---
snippet: "
function* f() { }
f();
"
frame size: 4
parameter count: 1
bytecode array length: 66
bytecodes: [
B(Ldar), R(0),
B(JumpIfUndefined), U8(18),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(0), U8(1),
B(PushContext), R(2),
B(RestoreGeneratorState), R(0),
B(Star), R(1),
B(SwitchOnSmiNoFeedback), U8(0), U8(1), I8(0),
B(Abort), U8(15),
B(LdaSmi), I8(-2),
B(Star), R(1),
B(Mov), R(closure), R(2),
B(Mov), R(this), R(3),
B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(2), U8(2),
B(Star), R(0),
/* 11 E> */ B(StackCheck),
/* 11 E> */ B(SuspendGenerator), R(0), R(0), U8(2), U8(0),
/* 16 S> */ B(Return),
B(ResumeGenerator), R(0), R(1), R(0), U8(2),
B(Star), R(2),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
B(SwitchOnSmiNoFeedback), U8(1), U8(2), I8(0),
B(Ldar), R(2),
/* 11 E> */ B(Throw),
B(Ldar), R(2),
/* 16 S> */ B(Return),
B(LdaUndefined),
/* 16 S> */ B(Return),
]
constant pool: [
Smi [29],
Smi [10],
Smi [7],
]
handlers: [
]
---
snippet: "
function* f() { yield 42 }
f();
"
frame size: 4
parameter count: 1
bytecode array length: 104
bytecodes: [
B(Ldar), R(0),
B(JumpIfUndefined), U8(18),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(0), U8(1),
B(PushContext), R(2),
B(RestoreGeneratorState), R(0),
B(Star), R(1),
B(SwitchOnSmiNoFeedback), U8(0), U8(2), I8(0),
B(Abort), U8(15),
B(LdaSmi), I8(-2),
B(Star), R(1),
B(Mov), R(closure), R(2),
B(Mov), R(this), R(3),
B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(2), U8(2),
B(Star), R(0),
/* 11 E> */ B(StackCheck),
/* 11 E> */ B(SuspendGenerator), R(0), R(0), U8(2), U8(0),
/* 25 S> */ B(Return),
B(ResumeGenerator), R(0), R(1), R(0), U8(2),
B(Star), R(2),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
B(SwitchOnSmiNoFeedback), U8(2), U8(2), I8(0),
B(Ldar), R(2),
/* 11 E> */ B(Throw),
B(Ldar), R(2),
/* 25 S> */ B(Return),
/* 16 S> */ B(LdaSmi), I8(42),
B(Star), R(2),
B(LdaFalse),
B(Star), R(3),
B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(2), U8(2),
B(SuspendGenerator), R(0), R(0), U8(2), U8(1),
/* 25 S> */ B(Return),
B(ResumeGenerator), R(0), R(1), R(0), U8(2),
B(Star), R(2),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
B(SwitchOnSmiNoFeedback), U8(4), U8(2), I8(0),
B(Ldar), R(2),
/* 16 E> */ B(Throw),
B(Ldar), R(2),
/* 25 S> */ B(Return),
B(LdaUndefined),
/* 25 S> */ B(Return),
]
constant pool: [
Smi [29],
Smi [67],
Smi [10],
Smi [7],
Smi [10],
Smi [7],
]
handlers: [
]
---
snippet: "
function* f() { for (let x of [42]) yield x }
f();
"
frame size: 18
parameter count: 1
bytecode array length: 374
bytecodes: [
B(Ldar), R(2),
B(JumpIfUndefined), U8(18),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
B(PushContext), R(12),
B(RestoreGeneratorState), R(2),
B(Star), R(11),
B(SwitchOnSmiNoFeedback), U8(0), U8(2), I8(0),
B(Abort), U8(15),
B(LdaSmi), I8(-2),
B(Star), R(11),
B(Mov), R(closure), R(12),
B(Mov), R(this), R(13),
B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(12), U8(2),
B(Star), R(2),
/* 11 E> */ B(StackCheck),
/* 11 E> */ B(SuspendGenerator), R(2), R(0), U8(12), U8(0),
/* 44 S> */ B(Return),
B(ResumeGenerator), R(2), R(11), R(0), U8(12),
B(Star), R(12),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
B(SwitchOnSmiNoFeedback), U8(2), U8(2), I8(0),
B(Ldar), R(12),
/* 11 E> */ B(Throw),
B(Ldar), R(12),
/* 44 S> */ B(Return),
B(LdaZero),
B(Star), R(7),
B(Mov), R(context), R(14),
B(Mov), R(context), R(15),
/* 30 S> */ B(CreateArrayLiteral), U8(4), U8(0), U8(37),
B(Star), R(16),
B(LdaNamedProperty), R(16), U8(5), U8(1),
B(Star), R(17),
B(CallProperty0), R(17), R(16), U8(3),
B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
B(Star), R(4),
/* 30 E> */ B(LdaNamedProperty), R(4), U8(6), U8(5),
B(Star), R(5),
B(Ldar), R(11),
B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(1),
B(LdaSmi), I8(-2),
B(TestEqualStrictNoFeedback), R(11),
B(JumpIfTrue), U8(4),
B(Abort), U8(15),
/* 25 S> */ B(CallProperty0), R(5), R(4), U8(7),
B(Star), R(6),
/* 25 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
B(ToBooleanLogicalNot),
B(JumpIfFalse), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
B(LdaNamedProperty), R(6), U8(8), U8(9),
B(JumpIfToBooleanTrue), U8(67),
B(LdaNamedProperty), R(6), U8(9), U8(11),
B(Star), R(8),
B(LdaSmi), I8(2),
B(Star), R(7),
B(Mov), R(8), R(3),
/* 16 E> */ B(StackCheck),
B(Mov), R(3), R(0),
/* 36 S> */ B(LdaFalse),
B(Star), R(17),
B(Mov), R(0), R(16),
B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(16), U8(2),
B(SuspendGenerator), R(2), R(0), U8(16), U8(1),
/* 44 S> */ B(Return),
B(ResumeGenerator), R(2), R(11), R(0), U8(16),
B(Star), R(16),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
B(SwitchOnSmiNoFeedback), U8(10), U8(2), I8(0),
B(Ldar), R(16),
/* 36 E> */ B(Throw),
B(LdaZero),
B(Star), R(12),
B(Mov), R(16), R(13),
B(Jump), U8(58),
B(LdaZero),
B(Star), R(7),
B(JumpLoop), U8(100), I8(0),
B(Jump), U8(36),
B(Star), R(16),
B(Ldar), R(closure),
B(CreateCatchContext), R(16), U8(12), U8(13),
B(PushContext), R(16),
B(Star), R(15),
B(LdaSmi), I8(2),
B(TestEqualStrict), R(7), U8(13),
B(JumpIfFalse), U8(6),
B(LdaSmi), I8(1),
B(Star), R(7),
B(LdaImmutableCurrentContextSlot), U8(4),
B(Star), R(17),
B(CallRuntime), U16(Runtime::kReThrow), R(17), U8(1),
B(PopContext), R(16),
B(LdaSmi), I8(-1),
B(Star), R(13),
B(Star), R(12),
B(Jump), U8(8),
B(Star), R(13),
B(LdaSmi), I8(1),
B(Star), R(12),
B(LdaTheHole),
B(SetPendingMessage),
B(Star), R(14),
B(LdaZero),
B(TestEqualStrict), R(7), U8(14),
B(JumpIfTrue), U8(90),
B(LdaNamedProperty), R(4), U8(14), U8(15),
B(Star), R(9),
B(TestUndetectable),
B(JumpIfFalse), U8(4),
B(Jump), U8(79),
B(LdaSmi), I8(1),
B(TestEqualStrict), R(7), U8(17),
B(JumpIfFalse), U8(47),
B(Ldar), R(9),
B(TestTypeOf), U8(6),
B(JumpIfFalse), U8(4),
B(Jump), U8(18),
B(Wide), B(LdaSmi), I16(144),
B(Star), R(15),
B(LdaConstant), U8(15),
B(Star), R(16),
B(CallRuntime), U16(Runtime::kNewTypeError), R(15), U8(2),
B(Throw),
B(Mov), R(context), R(15),
B(Mov), R(9), R(16),
B(Mov), R(4), R(17),
B(InvokeIntrinsic), U8(Runtime::k_Call), R(16), U8(2),
B(Jump), U8(6),
B(LdaTheHole),
B(SetPendingMessage),
B(Ldar), R(15),
B(Jump), U8(27),
B(Mov), R(9), R(15),
B(Mov), R(4), R(16),
B(InvokeIntrinsic), U8(Runtime::k_Call), R(15), U8(2),
B(Star), R(10),
B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
B(JumpIfToBooleanFalse), U8(4),
B(Jump), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
B(Ldar), R(14),
B(SetPendingMessage),
B(Ldar), R(12),
B(SwitchOnSmiNoFeedback), U8(16), U8(2), I8(0),
B(Jump), U8(8),
B(Ldar), R(13),
/* 44 S> */ B(Return),
B(Ldar), R(13),
B(ReThrow),
B(LdaUndefined),
/* 44 S> */ B(Return),
]
constant pool: [
Smi [29],
Smi [90],
Smi [10],
Smi [7],
TUPLE2_TYPE,
SYMBOL_TYPE,
ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
Smi [69],
ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
Smi [15],
Smi [7],
ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
FIXED_ARRAY_TYPE,
ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
ONE_BYTE_INTERNALIZED_STRING_TYPE [""],
Smi [6],
Smi [9],
]
handlers: [
[70, 243, 251],
[73, 207, 209],
[312, 322, 324],
]
---
snippet: "
function* g() { yield 42 }
function* f() { yield* g() }
f();
"
frame size: 10
parameter count: 1
bytecode array length: 255
bytecodes: [
B(Ldar), R(0),
B(JumpIfUndefined), U8(18),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(0), U8(1),
B(PushContext), R(2),
B(RestoreGeneratorState), R(0),
B(Star), R(1),
B(SwitchOnSmiNoFeedback), U8(0), U8(2), I8(0),
B(Abort), U8(15),
B(LdaSmi), I8(-2),
B(Star), R(1),
B(Mov), R(closure), R(2),
B(Mov), R(this), R(3),
B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(2), U8(2),
B(Star), R(0),
/* 38 E> */ B(StackCheck),
/* 38 E> */ B(SuspendGenerator), R(0), R(0), U8(2), U8(0),
/* 54 S> */ B(Return),
B(ResumeGenerator), R(0), R(1), R(0), U8(2),
B(Star), R(2),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
B(SwitchOnSmiNoFeedback), U8(2), U8(2), I8(0),
B(Ldar), R(2),
/* 38 E> */ B(Throw),
B(Ldar), R(2),
/* 54 S> */ B(Return),
/* 43 S> */ B(LdaGlobal), U8(4), U8(0),
B(Star), R(9),
/* 50 E> */ B(CallUndefinedReceiver0), R(9), U8(2),
B(Star), R(7),
B(LdaNamedProperty), R(7), U8(5), U8(4),
B(Star), R(8),
B(CallProperty0), R(8), R(7), U8(6),
B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
B(Star), R(4),
B(LdaNamedProperty), R(4), U8(6), U8(8),
B(Star), R(6),
B(LdaUndefined),
B(Star), R(5),
B(LdaZero),
B(Star), R(3),
B(Ldar), R(1),
B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(1),
B(LdaSmi), I8(-2),
B(TestEqualStrictNoFeedback), R(1),
B(JumpIfTrue), U8(4),
B(Abort), U8(15),
B(Ldar), R(3),
B(SwitchOnSmiNoFeedback), U8(8), U8(2), I8(1),
B(CallProperty1), R(6), R(4), R(5), U8(10),
B(Jump), U8(69),
B(LdaNamedProperty), R(4), U8(10), U8(12),
B(JumpIfUndefined), U8(13),
B(JumpIfNull), U8(11),
B(Star), R(9),
B(CallProperty1), R(9), R(4), R(5), U8(14),
B(Jump), U8(52),
B(Ldar), R(5),
/* 54 S> */ B(Return),
B(LdaNamedProperty), R(4), U8(11), U8(16),
B(JumpIfUndefined), U8(13),
B(JumpIfNull), U8(11),
B(Star), R(9),
B(CallProperty1), R(9), R(4), R(5), U8(18),
B(Jump), U8(32),
B(LdaNamedProperty), R(4), U8(10), U8(20),
B(JumpIfUndefined), U8(21),
B(JumpIfNull), U8(19),
B(Star), R(9),
B(CallProperty0), R(9), R(4), U8(22),
B(Jump), U8(2),
B(JumpIfJSReceiver), U8(9),
B(Star), R(9),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
B(CallRuntime), U16(Runtime::kThrowThrowMethodMissing), R(0), U8(0),
B(Star), R(2),
B(JumpIfJSReceiver), U8(7),
B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(2), U8(1),
B(LdaNamedProperty), R(2), U8(12), U8(24),
B(JumpIfToBooleanTrue), U8(26),
B(Ldar), R(2),
B(SuspendGenerator), R(0), R(0), U8(9), U8(1),
/* 54 S> */ B(Return),
B(ResumeGenerator), R(0), R(1), R(0), U8(9),
B(Star), R(5),
B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
B(Star), R(3),
B(JumpLoop), U8(130), I8(0),
B(LdaNamedProperty), R(2), U8(13), U8(26),
B(Star), R(4),
B(LdaSmi), I8(1),
B(TestEqualStrictNoFeedback), R(3),
B(JumpIfFalse), U8(5),
B(Ldar), R(4),
/* 54 S> */ B(Return),
B(LdaUndefined),
/* 54 S> */ B(Return),
]
constant pool: [
Smi [29],
Smi [91],
Smi [10],
Smi [7],
ONE_BYTE_INTERNALIZED_STRING_TYPE ["g"],
SYMBOL_TYPE,
ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
Smi [115],
Smi [11],
Smi [31],
ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
ONE_BYTE_INTERNALIZED_STRING_TYPE ["throw"],
ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
]
handlers: [
]
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