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Postorder opcodes #641

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Merged
merged 3 commits into from
Apr 21, 2016
Merged

Postorder opcodes #641

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4279987
Add opcodes for else and end.
Mar 29, 2016
bd8741f
Reorganize opcodes for postorder
Mar 29, 2016
2766cd2
Update BinaryEncoding.md
Mar 29, 2016
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32 changes: 17 additions & 15 deletions BinaryEncoding.md
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Expand Up @@ -317,18 +317,20 @@ It is legal to have several entries with the same type.
| Name | Opcode | Immediate | Description |
| ---- | ---- | ---- | ---- |
| `nop` | `0x00` | | no operation |
| `block` | `0x01` | count = `varuint32` | a sequence of expressions, the last of which yields a value |
| `loop` | `0x02` | count = `varuint32` | a block which can also form control flow loops |
| `if` | `0x03` | | high-level one-armed if |
| `if_else` | `0x04` | | high-level two-armed if |
| `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 |
| `else` | `0x04` | | begin else expression of if |
| `select` | `0x05` | | select one of two values based on condition |
| `br` | `0x06` | relative_depth = `varuint32` | break that targets a outer nested block |
| `br_if` | `0x07` | relative_depth = `varuint32` | conditional break that targets a outer nested block |
| `br_table` | `0x08` | see below | branch table control flow construct |
| `return` | `0x14` | | return zero or one value from this function |
| `unreachable` | `0x15` | | trap immediately |
| `return` | `0x09` | | return zero or one value from this function |
| `unreachable` | `0x0a` | | trap immediately |
| `end` | `0x0f` | | end a block, loop, or if |

The `br_table` operator has an immediate operand which is encoded as follows:
Note that there is no explicit `if_else` opcode, as the else clause is encoded with the `else` bytecode.

| Field | Type | Description |
| ---- | ---- | ---- |
Expand All @@ -343,15 +345,15 @@ out of range, `br_table` branches to the default target.
## Basic operators ([described here](AstSemantics.md#constants))
| Name | Opcode | Immediate | Description |
| ---- | ---- | ---- | ---- |
| `i32.const` | `0x0a` | value = `varint32` | a constant value interpreted as `i32` |
| `i64.const` | `0x0b` | value = `varint64` | a constant value interpreted as `i64` |
| `f64.const` | `0x0c` | value = `uint64` | a constant value interpreted as `f64` |
| `f32.const` | `0x0d` | value = `uint32` | a constant value interpreted as `f32` |
| `get_local` | `0x0e` | local_index = `varuint32` | read a local variable or parameter |
| `set_local` | `0x0f` | local_index = `varuint32` | write a local variable or parameter |
| `call` | `0x12` | function_index = `varuint32` | call a function by its index |
| `call_indirect` | `0x13` | signature_index = `varuint32` | call a function indirect with an expected signature |
| `call_import` | `0x1f` | import_index = `varuint32` | call an imported function by its index |
| `i32.const` | `0x10` | value = `varint32` | a constant value interpreted as `i32` |
| `i64.const` | `0x11` | value = `varint64` | a constant value interpreted as `i64` |
| `f64.const` | `0x12` | value = `uint64` | a constant value interpreted as `f64` |
| `f32.const` | `0x13` | value = `uint32` | a constant value interpreted as `f32` |
| `get_local` | `0x14` | local_index = `varuint32` | read a local variable or parameter |
| `set_local` | `0x15` | local_index = `varuint32` | write a local variable or parameter |
| `call` | `0x16` | function_index = `varuint32` | call a function by its index |
| `call_indirect` | `0x17` | signature_index = `varuint32` | call a function indirect with an expected signature |
| `call_import` | `0x18` | import_index = `varuint32` | call an imported function by its index |

## Memory-related operators ([described here](AstSemantics.md#linear-memory-accesses))

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