mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-05 06:32:30 +02:00
eb9432fcb8
Carry full source positions through the Rust bytecode source map so stack traces and other bytecode-backed source lookups can use them directly. This keeps exception-heavy paths from reconstructing line and column information through SourceCode::range_from_offsets(), which can spend a lot of time building SourceCode's position cache on first use. We're trading some space for time here, but I believe it's worth it at this tag, as this saves ~250ms of main thread time while loading https://x.com/ on my Linux machine. :^) Reading the stored Position out of the source map directly also exposed two things masked by the old range_from_offsets() path: a latent off-by-one in Lexer::new_at_offset() (its consume() bumped line_column past the character at offset; only synthesize_binding_pattern() hit it), and a (1,1) fallback in range_from_offsets() that fired whenever the queried range reached EOF. Fix the lexer, then rebaseline both the bytecode dump tests (no more spurious "1:1") and the destructuring AST tests (binding-pattern identifiers now report their real columns).
107 lines
3.0 KiB
Plaintext
107 lines
3.0 KiB
Plaintext
$dc4cd9dd const-fold-template-literals.js:20:1
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Registers: 7
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Blocks: 1
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Constants:
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[0] = String("abc")
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[1] = String("xyz")
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[2] = String("abcxyz")
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[3] = String("")
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[4] = Undefined
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[5] = Int32(1)
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[6] = Int32(2)
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[7] = Int32(3)
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block0:
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[ 0] InitializeLexicalBinding `a`, src:String("abcxyz")
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[ 18] InitializeLexicalBinding `b`, src:String("abcxyz")
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[ 30] InitializeLexicalBinding `c`, src:String("abcxyz")
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[ 48] InitializeLexicalBinding `d`, src:String("abcxyz")
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[ 60] InitializeLexicalBinding `e`, src:String("abcxyz")
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[ 78] InitializeLexicalBinding `f`, src:String("abcxyz")
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[ 90] Mov dst:reg5, src:String("abc")
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[ a0] ConcatString dst:reg5, src:String("xyz")
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[ b0] InitializeLexicalBinding `g`, src:reg5
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[ c8] GetGlobal dst:reg6, `prefix`
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[ e0] Call dst:reg5, callee:reg6, this_value:Undefined, prefix, arguments:[String("abc")]
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[ 108] InitializeLexicalBinding `_prefix`, src:reg5
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[ 120] GetGlobal dst:reg6, `suffix`
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[ 138] Call dst:reg5, callee:reg6, this_value:Undefined, suffix, arguments:[String("abc")]
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[ 160] InitializeLexicalBinding `_suffix`, src:reg5
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[ 178] GetGlobal dst:reg6, `tostring`
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[ 190] Call dst:reg5, callee:reg6, this_value:Undefined, tostring, arguments:[String("abc")]
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[ 1b8] InitializeLexicalBinding `_tostring`, src:reg5
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[ 1d0] GetGlobal dst:reg6, `multi`
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[ 1e8] Call dst:reg5, callee:reg6, this_value:Undefined, multi, arguments:[Int32(1), Int32(2), Int32(3)]
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[ 218] InitializeLexicalBinding `_multi`, src:reg5
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[ 230] GetGlobal dst:reg6, `literal`
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[ 248] Call dst:reg5, callee:reg6, this_value:Undefined, literal
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[ 268] InitializeLexicalBinding `_literal`, src:reg5
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[ 280] GetGlobal dst:reg6, `empty`
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[ 298] Call dst:reg5, callee:reg6, this_value:Undefined, empty
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[ 2b8] InitializeLexicalBinding `_empty`, src:reg5
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[ 2d0] End value:Undefined
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prefix$f72ec249 const-fold-template-literals.js:2:5
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Registers: 6
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Blocks: 1
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Constants:
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[0] = String("prefix-")
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block0:
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[ 0] Mov dst:reg5, src:String("prefix-")
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[ 10] ConcatString dst:reg5, src:arg0
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[ 20] Return value:reg5
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suffix$5b9fba3e const-fold-template-literals.js:5:5
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Registers: 6
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Blocks: 1
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Constants:
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[0] = String("-suffix")
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block0:
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[ 0] ToString dst:reg5, value:arg0
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[ 10] ConcatString dst:reg5, src:String("-suffix")
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[ 20] Return value:reg5
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tostring$1567fc7c const-fold-template-literals.js:8:5
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Registers: 6
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Blocks: 1
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block0:
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[ 0] ToString dst:reg5, value:arg0
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[ 10] Return value:reg5
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multi$f3ef7824 const-fold-template-literals.js:11:5
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Registers: 6
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Blocks: 1
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block0:
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[ 0] ToString dst:reg5, value:arg0
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[ 10] ConcatString dst:reg5, src:arg1
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[ 20] ConcatString dst:reg5, src:arg2
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[ 30] Return value:reg5
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literal$c7e85f9e const-fold-template-literals.js:14:5
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Registers: 6
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Blocks: 1
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Constants:
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[0] = String("hello world")
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block0:
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[ 0] Return value:String("hello world")
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empty$93602216 const-fold-template-literals.js:17:5
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Registers: 5
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Blocks: 1
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Constants:
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[0] = String("")
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block0:
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[ 0] Return value:String("")
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