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[spec] Use fieldidx instead of u32 #2149

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Merged
rossberg merged 1 commit into from
Apr 30, 2026
Merged

[spec] Use fieldidx instead of u32 #2149

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2 changes: 1 addition & 1 deletion document/core/binary/modules.rst
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Expand Up @@ -42,7 +42,7 @@ All basic :ref:`indices <syntax-index>` are encoded with their respective value.

$${grammar: {
Btypeidx Bfuncidx Btableidx Bmemidx Bglobalidx Btagidx Belemidx Bdataidx
Blocalidx Blabelidx
Blocalidx Bfieldidx Blabelidx
}}

:ref:`External indices <syntax-externidx>` are encoded by a distiguishing byte followed by an encoding of their respective value.
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4 changes: 2 additions & 2 deletions specification/wasm-3.0/1.3-syntax.instructions.spectec
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Expand Up @@ -324,8 +324,8 @@ syntax instr/i31 hint(desc "scalar reference instruction") = ...
syntax instr/struct hint(desc "structure reference instruction") = ...
| STRUCT.NEW typeidx
| STRUCT.NEW_DEFAULT typeidx
| STRUCT.GET sx? typeidx u32 hint(show STRUCT.GET#_#% % %)
| STRUCT.SET typeidx u32
| STRUCT.GET sx? typeidx fieldidx hint(show STRUCT.GET#_#% % %)
| STRUCT.SET typeidx fieldidx
| ...

syntax instr/array hint(desc "array reference instruction") = ...
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1 change: 1 addition & 0 deletions specification/wasm-3.0/5.1-binary.values.spectec
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Expand Up @@ -78,6 +78,7 @@ grammar Bfuncidx : funcidx = x:Bu32 => x
grammar Bdataidx : dataidx = x:Bu32 => x
grammar Belemidx : elemidx = x:Bu32 => x
grammar Blocalidx : localidx = x:Bu32 => x
grammar Bfieldidx : fieldidx = x:Bu32 => x
grammar Blabelidx : labelidx = l:Bu32 => l

grammar Bexternidx : externidx =
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8 changes: 4 additions & 4 deletions specification/wasm-3.0/5.3-binary.instructions.spectec
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Expand Up @@ -151,10 +151,10 @@ grammar Binstr/ref : instr = ...
grammar Binstr/struct : instr = ...
| 0xFB 0:Bu32 x:Btypeidx => STRUCT.NEW x
| 0xFB 1:Bu32 x:Btypeidx => STRUCT.NEW_DEFAULT x
| 0xFB 2:Bu32 x:Btypeidx i:Bu32 => STRUCT.GET x i
| 0xFB 3:Bu32 x:Btypeidx i:Bu32 => STRUCT.GET S x i
| 0xFB 4:Bu32 x:Btypeidx i:Bu32 => STRUCT.GET U x i
| 0xFB 5:Bu32 x:Btypeidx i:Bu32 => STRUCT.SET x i
| 0xFB 2:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.GET x i
| 0xFB 3:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.GET S x i
| 0xFB 4:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.GET U x i
| 0xFB 5:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.SET x i
| ...

grammar Binstr/array : instr = ...
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4 changes: 2 additions & 2 deletions specification/wasm-latest/1.3-syntax.instructions.spectec
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Expand Up @@ -324,8 +324,8 @@ syntax instr/i31 hint(desc "scalar reference instruction") = ...
syntax instr/struct hint(desc "structure reference instruction") = ...
| STRUCT.NEW typeidx
| STRUCT.NEW_DEFAULT typeidx
| STRUCT.GET sx? typeidx u32 hint(show STRUCT.GET#_#% % %)
| STRUCT.SET typeidx u32
| STRUCT.GET sx? typeidx fieldidx hint(show STRUCT.GET#_#% % %)
| STRUCT.SET typeidx fieldidx
| ...

syntax instr/array hint(desc "array reference instruction") = ...
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1 change: 1 addition & 0 deletions specification/wasm-latest/5.1-binary.values.spectec
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Expand Up @@ -78,6 +78,7 @@ grammar Bfuncidx : funcidx = x:Bu32 => x
grammar Bdataidx : dataidx = x:Bu32 => x
grammar Belemidx : elemidx = x:Bu32 => x
grammar Blocalidx : localidx = x:Bu32 => x
grammar Bfieldidx : fieldidx = x:Bu32 => x
grammar Blabelidx : labelidx = l:Bu32 => l

grammar Bexternidx : externidx =
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8 changes: 4 additions & 4 deletions specification/wasm-latest/5.3-binary.instructions.spectec
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Expand Up @@ -151,10 +151,10 @@ grammar Binstr/ref : instr = ...
grammar Binstr/struct : instr = ...
| 0xFB 0:Bu32 x:Btypeidx => STRUCT.NEW x
| 0xFB 1:Bu32 x:Btypeidx => STRUCT.NEW_DEFAULT x
| 0xFB 2:Bu32 x:Btypeidx i:Bu32 => STRUCT.GET x i
| 0xFB 3:Bu32 x:Btypeidx i:Bu32 => STRUCT.GET S x i
| 0xFB 4:Bu32 x:Btypeidx i:Bu32 => STRUCT.GET U x i
| 0xFB 5:Bu32 x:Btypeidx i:Bu32 => STRUCT.SET x i
| 0xFB 2:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.GET x i
| 0xFB 3:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.GET S x i
| 0xFB 4:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.GET U x i
| 0xFB 5:Bu32 x:Btypeidx i:Bfieldidx => STRUCT.SET x i
| ...

grammar Binstr/array : instr = ...
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