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Ignore and skip all unknown sections. #551

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Ignore and skip all unknown sections. #551

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18 changes: 15 additions & 3 deletions BinaryEncoding.md
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Expand Up @@ -187,14 +187,26 @@ stored to from dedicated instructions.
| type | `uint8` | the type of the global, as a memory type |
| exported | `uint8` | a boolean indicating whether the global variable is exported |

### WorkInProgress: WLL section
### All other sections

These sections can occur in any order and multiple times.

| Field | Type | Description |
| ----- | ----- | ----- |
| id = `0x11` | `uint8` | section identifier for globals |
| size | `varuint32` | size of this section in bytes |
| id | `uint8` | section identifier |
| size | `uint32` | size of this section in bytes excluding this size |
| body | `bytes` | contents of this section |

The section size is a fixed width to support back patching.

#### Known external section IDs.
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We won't need to enumerate known external section IDs if unknown sections are ignored per #552


The IDs are expected to be replaced by strings, and this table may be managed elsewhere in future.

| Id | Description |
|----|-------------|
| 0x11 | Web Low-level Language, [WLLang/WebLL](https://wllang.com/) |

# AST Encoding

Function bodies consist of a dense pre-order encoding of an [Abstract Syntax Tree](AstSemantics.md).
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