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https://github.com/LadybirdBrowser/ladybird
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3a08f7b95f
Teach the Rust bytecode generator to treat the synthetic entry GetLexicalEnvironment as a removable prologue load. We still model reg4 as the saved entry lexical environment during codegen, but assemble() now deletes that load when no emitted instruction refers to the saved environment register. This keeps the semantics of unwinding and environment restoration intact while letting empty functions and other simple bodies start at their first real instruction.
36 lines
961 B
Plaintext
36 lines
961 B
Plaintext
$d60f48d7 with-statement.js:7:1
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Registers: 7
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Blocks: 1
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Constants:
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[0] = Undefined
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block0:
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[ 0] GetGlobal dst:reg6, `withBlock`
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[ 18] Call dst:reg5, callee:reg6, this_value:Undefined, withBlock
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[ 38] End value:reg5
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withBlock$86b35e99 with-statement.js:2:15
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Registers: 10
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Blocks: 1
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Locals: obj~0
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Constants:
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[0] = Int32(42)
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[1] = Undefined
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block0:
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[ 0] GetLexicalEnvironment dst:reg4
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[ 8] NewObject dst:obj~0
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[ 18] InitObjectLiteralProperty object:obj~0, `x`, src:Int32(42), shape_cache_index:0, property_slot:0
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[ 30] CacheObjectShape object:obj~0
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[ 40] EnterObjectEnvironment dst:reg5, object:obj~0
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[ 50] GetBinding dst:reg7, `console`
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[ 68] GetById dst:reg8, base:reg7, `log` (console.log)
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[ 88] GetBinding dst:reg9, `x`
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[ a0] Call dst:reg6, callee:reg8, this_value:reg7, console.log, arguments:[reg9]
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[ c8] SetLexicalEnvironment environment:reg4
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[ d0] End value:Undefined
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42
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