c7ebc5814f
This is a reland of 35269f77f8
Switches on an expression that unconditionally throws would have all their
case statements dead, causing a DCHECK error in the SwitchBuilder. This
fixes up the DCHECK to allow dead labels.
Original change's description:
> [ignition] Skip binding dead labels
>
> BytecodeLabels for forward jumps may create a dead basic block if their
> corresponding jump was elided (due to it dead code elimination). We can
> avoid generating such dead basic blocks by skipping the label bind when
> no corresponding jump has been observed. This works because all jumps
> except JumpLoop are forward jumps, so we only have to special case one
> Bind for loop headers to bind unconditionally.
>
> Since Binds are now conditional on a jump existing, we can no longer rely
> on using Bind to get the current offset (e.g. at the beginning of a try
> block). Instead, we now expose the current offset in the bytecode array
> writer. Conveniently, this means that we can be a bit smarter about basic
> blocks around these statements.
>
> As a drive-by, remove the unused Bind(target,label) function.
>
> Bug: chromium:934166
> Change-Id: I532aa452fb083560d07b90da99caca0b1d082aa3
> Reviewed-on: https://chromium-review.googlesource.com/c/1488763
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#59942}
TBR=rmcilroy@chromium.org
Bug: chromium:934166
Change-Id: If6eab4162106717ce64a2dc477000c6a76354cb4
Reviewed-on: https://chromium-review.googlesource.com/c/1494535
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59948}
288 lines
5.0 KiB
Plaintext
288 lines
5.0 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;
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return a === null;
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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: 7
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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(TestNull),
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/* 63 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 = undefined;
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return undefined === a;
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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: 6
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaUndefined),
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B(Star), R(0),
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/* 53 S> */ B(TestUndefined),
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/* 76 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 = undefined;
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return undefined !== a;
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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: 7
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaUndefined),
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B(Star), R(0),
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/* 53 S> */ B(TestUndefined),
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/* 70 E> */ B(LogicalNot),
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/* 76 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 = 2;
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return a != null;
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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: 8
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaSmi), I8(2),
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B(Star), R(0),
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/* 45 S> */ B(TestUndetectable),
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/* 54 E> */ B(LogicalNot),
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/* 62 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 = undefined;
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return undefined == a;
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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: 6
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaUndefined),
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B(Star), R(0),
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/* 53 S> */ B(TestUndetectable),
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/* 75 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 = undefined;
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return undefined === a ? 1 : 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: 13
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaUndefined),
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B(Star), R(0),
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/* 53 S> */ B(JumpIfNotUndefined), U8(6),
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B(LdaSmi), I8(1),
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B(Jump), U8(4),
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B(LdaSmi), I8(2),
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/* 84 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 = 0;
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return null == a ? 1 : 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: 14
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaZero),
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B(Star), R(0),
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/* 45 S> */ B(TestUndetectable),
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B(JumpIfFalse), U8(6),
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B(LdaSmi), I8(1),
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B(Jump), U8(4),
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B(LdaSmi), I8(2),
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/* 70 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 = 0;
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return undefined !== a ? 1 : 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: 13
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaZero),
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B(Star), R(0),
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/* 45 S> */ B(JumpIfUndefined), U8(6),
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B(LdaSmi), I8(1),
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B(Jump), U8(4),
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B(LdaSmi), I8(2),
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/* 76 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 = 0;
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return a === null ? 1 : 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: 13
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bytecodes: [
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/* 30 E> */ B(StackCheck),
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/* 42 S> */ B(LdaZero),
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B(Star), R(0),
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/* 45 S> */ B(JumpIfNotNull), U8(6),
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B(LdaSmi), I8(1),
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B(Jump), U8(4),
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B(LdaSmi), I8(2),
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/* 71 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 = 0;
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if (a === null) {
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return 1;
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} else {
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return 2;
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}
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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(LdaZero),
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B(Star), R(0),
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/* 45 S> */ B(JumpIfNotNull), U8(5),
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/* 65 S> */ B(LdaSmi), I8(1),
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/* 74 S> */ B(Return),
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/* 86 S> */ B(LdaSmi), I8(2),
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/* 95 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 = 0;
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if (a != undefined) {
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return 1;
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}
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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(LdaZero),
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B(Star), R(0),
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/* 45 S> */ B(TestUndetectable),
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B(JumpIfTrue), U8(5),
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/* 69 S> */ B(LdaSmi), I8(1),
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/* 78 S> */ B(Return),
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B(LdaUndefined),
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/* 81 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 = undefined;
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var b = 0;
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while (a !== undefined) {
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b++;
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}
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"
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frame size: 2
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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(LdaUndefined),
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B(Star), R(0),
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/* 61 S> */ B(LdaZero),
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B(Star), R(1),
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/* 73 S> */ B(Ldar), R(0),
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B(JumpIfUndefined), U8(12),
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/* 64 E> */ B(StackCheck),
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/* 92 S> */ B(Ldar), R(1),
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B(Inc), U8(0),
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B(Star), R(1),
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B(JumpLoop), U8(11), I8(0),
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B(LdaUndefined),
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/* 99 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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