Preserve multivalue drops in IRBuilder #6150
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In Binaryen IR, we allow single `Drop` expressions to drop multiple values packaged up as a tuple. When using IRBuilder to rebuild IR containing such a drop, it previously treated the drop as a normal WebAssembly drop that dropped only a single value, producing invalid IR that had extra, undropped values. Fix the problem by preserving the arity of `Drop` inputs in IRBuilder. To avoid bloating the IR, thread the size of the desired value through IRBuilder's pop implementation so that tuple values do not need to be split up and recombined.
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ashleynh
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Dec 13, 2023
src/wasm-ir-builder.h
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| // hoistLastValue(). | ||
| [[nodiscard]] Result<> packageHoistedValue(const HoistedVal&); | ||
| // hoistLastValue(). `sizeHint` is the size of the type we ultimately want to | ||
| // consume, so if the hoisted values has `sizeHint` elements, it is left |
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| // consume, so if the hoisted values has `sizeHint` elements, it is left | |
| // consume, so if the hoisted value has `sizeHint` elements, it is left |
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In Binaryen IR, we allow single `Drop` expressions to drop multiple values packaged up as a tuple. When using IRBuilder to rebuild IR containing such a drop, it previously treated the drop as a normal WebAssembly drop that dropped only a single value, producing invalid IR that had extra, undropped values. Fix the problem by preserving the arity of `Drop` inputs in IRBuilder. To avoid bloating the IR, thread the size of the desired value through IRBuilder's pop implementation so that tuple values do not need to be split up and recombined.
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In Binaryen IR, we allow single
Dropexpressions to drop multiple valuespackaged up as a tuple. When using IRBuilder to rebuild IR containing such a
drop, it previously treated the drop as a normal WebAssembly drop that dropped
only a single value, producing invalid IR that had extra, undropped values. Fix
the problem by preserving the arity of
Dropinputs in IRBuilder. To avoidbloating the IR, thread the size of the desired value through IRBuilder's pop
implementation so that tuple values do not need to be split up and recombined.