7faa15d7ac
Improve handling of memory.grow/size, add a standalone wast runner, test harness improvements.
37 lines
1.3 KiB
Rust
37 lines
1.3 KiB
Rust
/// Tunable parameters for WebAssembly compilation.
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#[derive(Clone)]
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pub struct Tunables {
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/// For static heaps, the size of the heap protected by bounds checking.
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pub static_memory_bound: u32,
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/// The size of the offset guard for static heaps.
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pub static_memory_offset_guard_size: u64,
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/// The size of the offset guard for dynamic heaps.
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pub dynamic_memory_offset_guard_size: u64,
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}
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impl Default for Tunables {
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fn default() -> Self {
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Self {
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/// Size in wasm pages of the bound for static memories.
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///
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/// When we allocate 4 GiB of address space, we can avoid the
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/// need for explicit bounds checks.
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static_memory_bound: 0x1_0000,
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/// Size in bytes of the offset guard for static memories.
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///
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/// Allocating 2 GiB of address space lets us translate wasm
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/// offsets into x86 offsets as aggressively as we can.
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static_memory_offset_guard_size: 0x8000_0000,
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/// Size in bytes of the offset guard for dynamic memories.
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///
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/// Allocate a small guard to optimize common cases but without
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/// wasting too much memor.
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dynamic_memory_offset_guard_size: 0x1_0000,
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}
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}
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}
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