45 lines
1.3 KiB
Rust
45 lines
1.3 KiB
Rust
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use parity_wasm::elements::BlockType;
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pub mod stack;
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/// Index of default linear memory.
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pub const DEFAULT_MEMORY_INDEX: u32 = 0;
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/// Index of default table.
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pub const DEFAULT_TABLE_INDEX: u32 = 0;
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/// Maximum number of entries in value stack.
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pub const DEFAULT_VALUE_STACK_LIMIT: usize = 16384;
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/// Maximum number of entries in frame stack.
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pub const DEFAULT_FRAME_STACK_LIMIT: usize = 1024;
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/// Control stack frame.
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#[derive(Debug, Clone)]
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pub struct BlockFrame {
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/// Frame type.
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pub frame_type: BlockFrameType,
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/// A signature, which is a block signature type indicating the number and types of result values of the region.
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pub block_type: BlockType,
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/// A label for reference to block instruction.
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pub begin_position: usize,
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/// A label for reference from branch instructions.
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pub branch_position: usize,
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/// A label for reference from end instructions.
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pub end_position: usize,
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/// A limit integer value, which is an index into the value stack indicating where to reset it to on a branch to that label.
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pub value_stack_len: usize,
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}
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/// Type of block frame.
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#[derive(Debug, Clone, Copy, PartialEq)]
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pub enum BlockFrameType {
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/// Function frame.
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Function,
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/// Usual block frame.
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Block,
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/// Loop frame (branching to the beginning of block).
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Loop,
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/// True-subblock of if expression.
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IfTrue,
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/// False-subblock of if expression.
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IfFalse,
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}
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