7be64db45f
This is a reland of cf93071c91
Original change's description:
> [interpreter] Short Star bytecode
>
> Design doc:
> https://docs.google.com/document/d/1g_NExMT78II_KnIYNa9MvyPYIj23qAiFUEsyemY5KRk/edit
>
> This change adds 16 new interpreter opcodes, kStar0 through kStar15, so
> that we can use a single byte to represent the common operation of
> storing to a low-numbered register. This generally reduces the quantity
> of bytecode generated on web sites by 8-9%.
>
> In order to not degrade speed, a couple of other changes are required:
>
> The existing lookahead logic to check for Star after certain other
> bytecode handlers is updated to check for these new short Star codes
> instead. Furthermore, that lookahead logic is updated to contain its own
> copy of the dispatch jump rather than merging control flow with the
> lookahead-failed case, to improve branch prediction.
>
> A bunch of constants use bytecode size in bytes as a proxy for the size
> or complexity of a function, and are adjusted downward proportionally to
> the decrease in generated bytecode size.
>
> Other small drive-by fix: update generate-bytecode-expectations to emit
> \n instead of \r\n on Windows.
>
> Change-Id: I6307c2b0f5794a3a1088bb0fb94f6e1615441ed5
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2641180
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#72773}
Change-Id: I1afb670c25694498b3989de615858f984a8c7f6f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698057
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72821}
374 lines
12 KiB
Plaintext
374 lines
12 KiB
Plaintext
#
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# Autogenerated by generate-bytecode-expectations.
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#
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---
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wrap: yes
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---
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snippet: "
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for (var p of [0, 1, 2]) {}
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"
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frame size: 12
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parameter count: 1
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bytecode array length: 127
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bytecodes: [
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/* 48 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(37),
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B(Star4),
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B(GetIterator), R(4), U8(1), U8(3),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
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B(Star3),
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B(LdaNamedProperty), R(3), U8(1), U8(5),
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B(Star2),
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B(LdaFalse),
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B(Star4),
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B(Mov), R(context), R(7),
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B(LdaTrue),
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B(Star4),
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/* 43 S> */ B(CallProperty0), R(2), R(3), U8(7),
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B(Star8),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
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B(LdaNamedProperty), R(8), U8(2), U8(9),
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B(JumpIfToBooleanTrue), U8(20),
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B(LdaNamedProperty), R(8), U8(3), U8(11),
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B(Star8),
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B(LdaFalse),
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B(Star4),
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B(Mov), R(8), R(1),
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/* 43 S> */ B(Mov), R(1), R(0),
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B(Ldar), R(8),
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/* 34 E> */ B(JumpLoop), U8(35), I8(0),
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B(LdaSmi), I8(-1),
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B(Star6),
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B(Star5),
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B(Jump), U8(5),
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B(Star6),
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B(LdaZero),
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B(Star5),
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B(LdaTheHole),
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B(SetPendingMessage),
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B(Star7),
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B(Ldar), R(4),
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B(JumpIfToBooleanTrue), U8(35),
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B(Mov), R(context), R(9),
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B(LdaNamedProperty), R(3), U8(4), U8(13),
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B(JumpIfUndefinedOrNull), U8(26),
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B(Star10),
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B(CallProperty0), R(10), R(3), U8(15),
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B(JumpIfJSReceiver), U8(19),
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B(Star11),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(11), U8(1),
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B(Jump), U8(11),
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B(Star9),
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B(LdaZero),
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B(TestReferenceEqual), R(5),
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B(JumpIfTrue), U8(5),
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B(Ldar), R(9),
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B(ReThrow),
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B(Ldar), R(7),
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B(SetPendingMessage),
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B(LdaZero),
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B(TestReferenceEqual), R(5),
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B(JumpIfFalse), U8(5),
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B(Ldar), R(6),
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B(ReThrow),
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B(LdaUndefined),
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/* 62 S> */ B(Return),
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]
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constant pool: [
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ARRAY_BOILERPLATE_DESCRIPTION_TYPE,
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
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]
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handlers: [
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[27, 65, 71],
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[84, 103, 105],
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]
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---
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snippet: "
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var x = 'potatoes';
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for (var p of x) { return p; }
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"
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frame size: 13
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parameter count: 1
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bytecode array length: 134
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bytecodes: [
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/* 42 S> */ B(LdaConstant), U8(0),
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B(Star0),
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/* 68 S> */ B(GetIterator), R(0), U8(0), U8(2),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
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B(Star4),
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B(LdaNamedProperty), R(4), U8(1), U8(4),
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B(Star3),
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B(LdaFalse),
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B(Star5),
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B(Mov), R(context), R(8),
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B(LdaTrue),
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B(Star5),
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/* 63 S> */ B(CallProperty0), R(3), R(4), U8(6),
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B(Star9),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
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B(LdaNamedProperty), R(9), U8(2), U8(8),
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B(JumpIfToBooleanTrue), U8(23),
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B(LdaNamedProperty), R(9), U8(3), U8(10),
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B(Star9),
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B(LdaFalse),
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B(Star5),
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B(Mov), R(9), R(2),
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/* 63 S> */ B(Mov), R(2), R(1),
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/* 73 S> */ B(LdaSmi), I8(1),
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B(Mov), R(9), R(7),
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B(Star6),
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B(Jump), U8(11),
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B(LdaSmi), I8(-1),
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B(Star7),
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B(Star6),
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B(Jump), U8(5),
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B(Star7),
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B(LdaZero),
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B(Star6),
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B(LdaTheHole),
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B(SetPendingMessage),
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B(Star8),
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B(Ldar), R(5),
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B(JumpIfToBooleanTrue), U8(35),
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B(Mov), R(context), R(10),
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B(LdaNamedProperty), R(4), U8(4), U8(12),
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B(JumpIfUndefinedOrNull), U8(26),
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B(Star11),
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B(CallProperty0), R(11), R(4), U8(14),
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B(JumpIfJSReceiver), U8(19),
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B(Star12),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(12), U8(1),
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B(Jump), U8(11),
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B(Star10),
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B(LdaZero),
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B(TestReferenceEqual), R(6),
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B(JumpIfTrue), U8(5),
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B(Ldar), R(10),
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B(ReThrow),
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B(Ldar), R(8),
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B(SetPendingMessage),
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B(Ldar), R(6),
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B(SwitchOnSmiNoFeedback), U8(5), U8(2), I8(0),
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B(Jump), U8(8),
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B(Ldar), R(7),
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B(ReThrow),
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B(Ldar), R(7),
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/* 85 S> */ B(Return),
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B(LdaUndefined),
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/* 85 S> */ B(Return),
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]
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constant pool: [
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["potatoes"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
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Smi [6],
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Smi [9],
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]
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handlers: [
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[25, 66, 72],
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[85, 104, 106],
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]
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---
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snippet: "
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for (var x of [10, 20, 30]) {
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if (x == 10) continue;
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if (x == 20) break;
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}
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"
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frame size: 12
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parameter count: 1
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bytecode array length: 143
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bytecodes: [
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/* 48 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(37),
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B(Star4),
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B(GetIterator), R(4), U8(1), U8(3),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
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B(Star3),
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B(LdaNamedProperty), R(3), U8(1), U8(5),
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B(Star2),
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B(LdaFalse),
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B(Star4),
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B(Mov), R(context), R(7),
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B(LdaTrue),
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B(Star4),
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/* 43 S> */ B(CallProperty0), R(2), R(3), U8(7),
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B(Star8),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
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B(LdaNamedProperty), R(8), U8(2), U8(9),
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B(JumpIfToBooleanTrue), U8(36),
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B(LdaNamedProperty), R(8), U8(3), U8(11),
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B(Star8),
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B(LdaFalse),
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B(Star4),
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B(Mov), R(8), R(1),
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/* 43 S> */ B(Mov), R(1), R(0),
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/* 66 S> */ B(LdaSmi), I8(10),
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/* 72 E> */ B(TestEqual), R(0), U8(13),
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B(JumpIfFalse), U8(4),
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/* 79 S> */ B(Jump), U8(11),
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/* 91 S> */ B(LdaSmi), I8(20),
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/* 97 E> */ B(TestEqual), R(0), U8(14),
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B(JumpIfFalse), U8(4),
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/* 104 S> */ B(Jump), U8(5),
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/* 34 E> */ B(JumpLoop), U8(51), I8(0),
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B(LdaSmi), I8(-1),
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B(Star6),
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B(Star5),
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B(Jump), U8(5),
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B(Star6),
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B(LdaZero),
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B(Star5),
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B(LdaTheHole),
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B(SetPendingMessage),
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B(Star7),
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B(Ldar), R(4),
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B(JumpIfToBooleanTrue), U8(35),
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B(Mov), R(context), R(9),
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B(LdaNamedProperty), R(3), U8(4), U8(15),
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B(JumpIfUndefinedOrNull), U8(26),
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B(Star10),
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B(CallProperty0), R(10), R(3), U8(17),
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B(JumpIfJSReceiver), U8(19),
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B(Star11),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(11), U8(1),
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B(Jump), U8(11),
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B(Star9),
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B(LdaZero),
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B(TestReferenceEqual), R(5),
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B(JumpIfTrue), U8(5),
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B(Ldar), R(9),
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B(ReThrow),
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B(Ldar), R(7),
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B(SetPendingMessage),
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B(LdaZero),
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B(TestReferenceEqual), R(5),
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B(JumpIfFalse), U8(5),
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B(Ldar), R(6),
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B(ReThrow),
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B(LdaUndefined),
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/* 113 S> */ B(Return),
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]
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constant pool: [
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ARRAY_BOILERPLATE_DESCRIPTION_TYPE,
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
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]
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handlers: [
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[27, 81, 87],
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[100, 119, 121],
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]
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---
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snippet: "
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var x = { 'a': 1, 'b': 2 };
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for (x['a'] of [1,2,3]) { return x['a']; }
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"
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frame size: 12
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parameter count: 1
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bytecode array length: 146
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bytecodes: [
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/* 42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41),
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B(Star0),
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/* 77 S> */ B(CreateArrayLiteral), U8(1), U8(1), U8(37),
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B(Star3),
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B(GetIterator), R(3), U8(2), U8(4),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
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B(Star2),
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B(LdaNamedProperty), R(2), U8(2), U8(6),
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B(Star1),
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B(LdaFalse),
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B(Star3),
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B(Mov), R(context), R(6),
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B(LdaTrue),
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B(Star3),
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/* 68 S> */ B(CallProperty0), R(1), R(2), U8(8),
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B(Star7),
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B(JumpIfJSReceiver), U8(7),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
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B(LdaNamedProperty), R(7), U8(3), U8(10),
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B(JumpIfToBooleanTrue), U8(28),
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B(LdaNamedProperty), R(7), U8(4), U8(12),
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B(Star7),
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B(LdaFalse),
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B(Star3),
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B(Ldar), R(7),
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/* 67 E> */ B(StaNamedProperty), R(0), U8(5), U8(14),
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/* 96 S> */ B(LdaNamedProperty), R(0), U8(5), U8(16),
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B(Star5),
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B(LdaSmi), I8(1),
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B(Star4),
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B(Mov), R(0), R(8),
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B(Jump), U8(11),
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B(LdaSmi), I8(-1),
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B(Star5),
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B(Star4),
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B(Jump), U8(5),
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B(Star5),
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B(LdaZero),
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B(Star4),
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B(LdaTheHole),
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B(SetPendingMessage),
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B(Star6),
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B(Ldar), R(3),
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B(JumpIfToBooleanTrue), U8(35),
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B(Mov), R(context), R(9),
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B(LdaNamedProperty), R(2), U8(6), U8(18),
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B(JumpIfUndefinedOrNull), U8(26),
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B(Star10),
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B(CallProperty0), R(10), R(2), U8(20),
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B(JumpIfJSReceiver), U8(19),
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B(Star11),
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B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(11), U8(1),
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B(Jump), U8(11),
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B(Star9),
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B(LdaZero),
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B(TestReferenceEqual), R(4),
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B(JumpIfTrue), U8(5),
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B(Ldar), R(9),
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B(ReThrow),
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B(Ldar), R(6),
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B(SetPendingMessage),
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B(Ldar), R(4),
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B(SwitchOnSmiNoFeedback), U8(7), U8(2), I8(0),
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B(Jump), U8(8),
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B(Ldar), R(5),
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B(ReThrow),
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B(Ldar), R(5),
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/* 105 S> */ B(Return),
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B(LdaUndefined),
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/* 105 S> */ B(Return),
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]
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constant pool: [
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OBJECT_BOILERPLATE_DESCRIPTION_TYPE,
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ARRAY_BOILERPLATE_DESCRIPTION_TYPE,
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["a"],
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ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
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Smi [6],
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Smi [9],
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]
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handlers: [
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[32, 78, 84],
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[97, 116, 118],
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]
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