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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.
45 lines
1.3 KiB
Plaintext
45 lines
1.3 KiB
Plaintext
$12ff989c var-binding-access.js:22:1
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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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block0:
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[ 0] GetGlobal dst:reg6, `var_access`
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[ 18] Call dst:reg5, callee:reg6, this_value:Undefined, var_access
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[ 38] GetGlobal dst:reg7, `let_access`
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[ 50] Call dst:reg6, callee:reg7, this_value:Undefined, let_access
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[ 70] End value:reg6
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var_access$84869239 var-binding-access.js:5:5
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Registers: 6
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Blocks: 1
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Constants:
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[0] = Undefined
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[1] = Int32(1)
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block0:
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[ 0] CreateVariable `x`, is_immutable:false, is_global:false, is_strict:false
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[ 10] InitializeVariableBinding `x`, src:Undefined
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[ 28] SetLexicalBinding `x`, src:Int32(1)
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[ 40] NewFunction dst:reg5, shared_function_data_index:0
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[ 58] GetInitializedBinding dst:reg5, `x`
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[ 70] Return value:reg5
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let_access$a0a01ad1 var-binding-access.js:14:5
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Registers: 7
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Blocks: 1
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Constants:
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[0] = Int32(1)
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block0:
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[ 0] GetLexicalEnvironment dst:reg4
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[ 8] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:1
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[ 18] CreateVariable `x`, is_immutable:false, is_global:false, is_strict:false
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[ 28] InitializeLexicalBinding `x`, src:Int32(1)
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[ 40] NewFunction dst:reg6, shared_function_data_index:0
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[ 58] GetBinding dst:reg6, `x`
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[ 70] Return value:reg6
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