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Make opcode 0x00 unreachable. #684

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May 21, 2016
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Make opcode 0x00 unreachable. #684

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4 changes: 2 additions & 2 deletions BinaryEncoding.md
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Original file line number Diff line number Diff line change
Expand Up @@ -326,7 +326,7 @@ It is legal to have several entries with the same type.

| Name | Opcode | Immediates | Description |
| ---- | ---- | ---- | ---- |
| `nop` | `0x00` | | no operation |
| `unreachable` | `0x00` | | trap immediately |
| `block` | `0x01` | | begin a sequence of expressions, the last of which yields a value |
| `loop` | `0x02` | | begin a block which can also form control flow loops |
| `if` | `0x03` | | begin if expression |
Expand All @@ -336,7 +336,7 @@ It is legal to have several entries with the same type.
| `br_if` | `0x07` | argument_count : `varuint1`, relative_depth : `varuint32` | conditional break that targets an outer nested block |
| `br_table` | `0x08` | see below | branch table control flow construct |
| `return` | `0x09` | argument_count : `varuint1` | return zero or one value from this function |
| `unreachable` | `0x0a` | | trap immediately |
| `nop` | `0x0a` | | no operation |
| `end` | `0x0f` | | end a block, loop, or if |

Note that there is no explicit `if_else` opcode, as the else clause is encoded with the `else` bytecode.
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