mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-30 19:47:17 +02:00
234203ed9b
The scope collector uses HashMaps for identifier groups and variables, which means their iteration order is non-deterministic. This causes local variable indices and function declaration instantiation (FDI) bytecode to vary between runs. Fix this by sorting identifier group keys alphabetically before assigning local variable indices, and sorting vars_to_initialize by name before emitting FDI bytecode. Also make register allocation deterministic by always picking the lowest-numbered free register instead of whichever one happens to be at the end of the free list. This is preparation for bringing in a new source->bytecode pipeline written in Rust. Checking for regressions is significantly easier if we can expect identical output from both pipelines.
82 lines
3.9 KiB
Plaintext
82 lines
3.9 KiB
Plaintext
JS bytecode executable ""
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] GetGlobal dst:reg6, identifier:console
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[ 18] GetById dst:reg7, base:reg6, property:log, base_identifier:console
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[ 30] GetGlobal dst:reg9, identifier:closureOverBlockScope
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[ 40] Call dst:reg8, callee:reg9, this_value:Undefined, closureOverBlockScope
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[ 60] Call dst:reg5, callee:reg7, this_value:reg6, console.log, arguments:[reg8]
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[ 88] GetGlobal dst:reg7, identifier:console
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[ 98] GetById dst:reg8, base:reg7, property:log, base_identifier:console
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[ b0] GetGlobal dst:reg10, identifier:breakThroughBlockScopes
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[ c0] Call dst:reg9, callee:reg10, this_value:Undefined, breakThroughBlockScopes
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[ e0] Call dst:reg6, callee:reg8, this_value:reg7, console.log, arguments:[reg9]
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[ 108] End value:reg6
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JS bytecode executable "closureOverBlockScope"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] NewArray dst:fns~0
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[ 18] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0
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[ 28] CreateMutableBinding environment:reg5, identifier:x, can_be_deleted:false
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[ 38] InitializeLexicalBinding identifier:x, src:Int32(1)
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[ 50] GetById dst:reg7, base:fns~0, property:push, base_identifier:fns
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[ 68] Mov dst:reg8, src:fns~0
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[ 78] NewFunction dst:reg9, shared_function_data_index:0
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[ 90] Call dst:reg6, callee:reg7, this_value:reg8, fns.push, arguments:[reg9]
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[ b8] SetLexicalEnvironment environment:reg4
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[ c0] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0
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[ d0] CreateMutableBinding environment:reg5, identifier:y, can_be_deleted:false
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[ e0] InitializeLexicalBinding identifier:y, src:Int32(2)
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[ f8] GetById dst:reg7, base:fns~0, property:push, base_identifier:fns
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[ 110] Mov dst:reg8, src:fns~0
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[ 120] NewFunction dst:reg9, shared_function_data_index:1
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[ 138] Call dst:reg6, callee:reg7, this_value:reg8, fns.push, arguments:[reg9]
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[ 160] SetLexicalEnvironment environment:reg4
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[ 168] GetByValue dst:reg6, base:fns~0, property:Int32(0)
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[ 180] Mov dst:reg7, src:fns~0
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[ 190] Call dst:reg5, callee:reg6, this_value:reg7, fns[0]
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[ 1b0] GetByValue dst:reg7, base:fns~0, property:Int32(1)
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[ 1c8] Mov dst:reg8, src:fns~0
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[ 1d8] Call dst:reg6, callee:reg7, this_value:reg8, fns[1]
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[ 1f8] Add dst:reg7, lhs:reg5, rhs:reg6
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[ 208] Return value:reg7
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JS bytecode executable ""
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] GetBinding dst:reg5, identifier:x
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[ 20] Return value:reg5
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JS bytecode executable ""
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] GetBinding dst:reg5, identifier:y
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[ 20] Return value:reg5
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JS bytecode executable "breakThroughBlockScopes"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] Mov dst:result~2, src:Undefined
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[ 18] Mov dst:i~1, src:Int32(0)
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[ 28] Jump target:@c0
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[ 30] 1: CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0
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[ 40] CreateMutableBinding environment:reg5, identifier:x, can_be_deleted:false
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[ 50] InitializeLexicalBinding identifier:x, src:i~1
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[ 68] NewFunction dst:f~0, shared_function_data_index:0, lhs_name:f
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[ 80] GetBinding dst:reg6, identifier:x
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[ 98] JumpGreaterThan lhs:reg6, rhs:Int32(1), true_target:@110, false_target:@130
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[ b0] 2: PostfixIncrement dst:reg5, src:i~1
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[ c0] 3: JumpLessThan lhs:i~1, rhs:Int32(3), true_target:@30, false_target:@d8
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[ d8] 4: Mov dst:reg6, src:result~2
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[ e8] Call dst:reg5, callee:reg6, this_value:Undefined, result
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[ 108] Return value:reg5
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[ 110] 5: Mov dst:result~2, src:f~0
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[ 120] SetLexicalEnvironment environment:reg4
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[ 128] Jump target:@d8
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[ 130] 6: SetLexicalEnvironment environment:reg4
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[ 138] Jump target:@b0
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JS bytecode executable "f"
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[ 0] 0: GetLexicalEnvironment dst:reg4
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[ 8] GetBinding dst:reg5, identifier:x
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[ 20] Return value:reg5
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2
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