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.
32 lines
1.1 KiB
Text
32 lines
1.1 KiB
Text
$34849cbe destructuring-param-no-param-expressions.js:10:1
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Registers: 8
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Blocks: 1
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Constants:
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[0] = Undefined
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[1] = Int32(1)
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[2] = Int32(2)
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block0:
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[ 0] GetGlobal dst:reg6, `f`
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[ 18] NewObject dst:reg7
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[ 28] InitObjectLiteralProperty object:reg7, `captured`, src:Int32(1), shape_cache_index:0, property_slot:0
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[ 40] InitObjectLiteralProperty object:reg7, `local`, src:Int32(2), shape_cache_index:0, property_slot:1
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[ 58] CacheObjectShape object:reg7
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[ 68] Call dst:reg5, callee:reg6, this_value:Undefined, f, arguments:[reg7]
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[ 90] End value:reg5
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f$84013cfc destructuring-param-no-param-expressions.js:7:5
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Registers: 6
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Blocks: 1
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Locals: local~0
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block0:
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[ 0] CreateVariable `captured`, is_immutable:false, is_global:false, is_strict:false
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[ 10] ThrowIfNullish src:arg0
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[ 18] GetById dst:reg5, base:arg0, `captured`
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[ 38] InitializeLexicalBinding `captured`, src:reg5
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[ 50] GetById dst:reg5, base:arg0, `local`
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[ 70] Mov dst:local~0, src:reg5
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[ 80] NewFunction dst:reg5, shared_function_data_index:0
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[ 98] Return value:reg5
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