cebfde6769
The function-entry stack check should dominate all other
instructions in a function. Prior to this CL it was possible to create
paths not including a stack check due to SwitchOnGeneratorState: the
generator-creation branch had a stack check, while generator-resume
branches did not.
0 : af fb 00 01 SwitchOnGeneratorState r0, [0], [1] { 0: @22 }
4 : 27 fe fa Mov <closure>, r1
7 : 27 02 f9 Mov <this>, r2
10 : 64 0a fa 02 InvokeIntrinsic [_CreateJSGeneratorObject], r1-r2
14 : 26 fb Star r0
16 : a7 StackCheck
17 : b0 fb fb 01 00 SuspendGenerator r0, r0-r0, [0]
22 : b1 fb fb 01 ResumeGenerator r0, r0-r0
[... no stack check here ...]
This CL moves the stack check to the beginning of the bytecode array,
i.e. before SwitchOnGeneratorState.
Bug: chromium:1020031
Change-Id: I8ba8cba99611ddbe50c76023129d926cc84b1d5e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1903440
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64888}
126 lines
2.6 KiB
Plaintext
126 lines
2.6 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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var a = 1; a += 2;
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"
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frame size: 1
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parameter count: 1
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bytecode array length: 12
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaSmi), I8(1),
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B(Star), R(0),
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/* 45 S> */ B(AddSmi), I8(2), U8(0),
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B(Star), R(0),
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B(LdaUndefined),
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/* 53 S> */ B(Return),
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]
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constant pool: [
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]
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handlers: [
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]
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---
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snippet: "
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var a = 1; a /= 2;
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"
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frame size: 1
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parameter count: 1
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bytecode array length: 12
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaSmi), I8(1),
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B(Star), R(0),
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/* 45 S> */ B(DivSmi), I8(2), U8(0),
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B(Star), R(0),
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B(LdaUndefined),
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/* 53 S> */ B(Return),
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]
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constant pool: [
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]
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handlers: [
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]
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---
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snippet: "
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var a = { val: 2 }; a.name *= 2;
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"
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frame size: 1
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parameter count: 1
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bytecode array length: 20
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41),
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B(Star), R(0),
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/* 54 S> */ B(LdaNamedProperty), R(0), U8(1), U8(1),
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B(MulSmi), I8(2), U8(3),
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/* 61 E> */ B(StaNamedProperty), R(0), U8(1), U8(4),
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B(LdaUndefined),
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/* 67 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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ONE_BYTE_INTERNALIZED_STRING_TYPE ["name"],
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]
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handlers: [
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]
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---
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snippet: "
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var a = { 1: 2 }; a[1] ^= 2;
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"
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frame size: 3
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parameter count: 1
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bytecode array length: 23
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41),
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B(Star), R(0),
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/* 52 S> */ B(LdaSmi), I8(1),
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B(Star), R(2),
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B(LdaKeyedProperty), R(0), U8(1),
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B(BitwiseXorSmi), I8(2), U8(3),
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/* 57 E> */ B(StaKeyedProperty), R(0), R(2), U8(4),
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B(LdaUndefined),
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/* 63 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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]
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handlers: [
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]
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---
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snippet: "
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var a = 1; (function f() { return a; }); a |= 24;
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"
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frame size: 1
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parameter count: 1
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bytecode array length: 23
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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B(CreateFunctionContext), U8(0), U8(1),
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B(PushContext), R(0),
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/* 42 S> */ B(LdaSmi), I8(1),
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/* 42 E> */ B(StaCurrentContextSlot), U8(2),
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/* 45 S> */ B(CreateClosure), U8(1), U8(0), U8(2),
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/* 75 S> */ B(LdaCurrentContextSlot), U8(2),
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B(BitwiseOrSmi), I8(24), U8(0),
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/* 77 E> */ B(StaCurrentContextSlot), U8(2),
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B(LdaUndefined),
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/* 84 S> */ B(Return),
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]
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constant pool: [
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SCOPE_INFO_TYPE,
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SHARED_FUNCTION_INFO_TYPE,
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]
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handlers: [
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]
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