memory.init
Initialize memory from a data segment.
bulk-memory0xFC 0x08
Syntax
memory.init
Stack Effect
[dst i32, src i32, len i32] -> []Opcode
- Hex
0xFC 0x08- Decimal
252 8- Bytes
[0xfc, 0x08]- Prefix
0xFCbulk-memory / saturating conversions / table extension space- Encoding
0xFC 0x08 <dataidx:u32-leb128> <memidx:u32-leb128>- Immediates
dataidx:u32-leb128memidx:u32-leb128— memory index (0 unless multi-memory)
- Category
- memory
- Proposal
- bulk-memory
Browser Support
Feature-detect runtime support before executing examples.
Validation Rules
- Operands and result types must match the instruction signature.
- The instruction must appear in a valid structured control context.
Common Mistakes
- Using the instruction with the wrong operand type.
- Forgetting that WAT validation is stack-typed.
(func $example
;; memory.init example
)