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cb4a957efd
This exposes access to the `grow_memory` and `current_memory` instructions provided by wasm in what will hopefully be a stable interface (the stable part being x86 first in theory).
31 lines
1.0 KiB
Rust
31 lines
1.0 KiB
Rust
extern "C" {
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#[link_name = "llvm.wasm.grow.memory.i32"]
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fn llvm_grow_memory(pages: i32) -> i32;
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#[link_name = "llvm.wasm.current.memory.i32"]
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fn llvm_current_memory() -> i32;
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}
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/// Corresponding intrinsic to wasm's [`current_memory` instruction][instr]
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///
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/// This function, when called, will return the current memory size in units of
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/// pages.
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///
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/// [instr]: https://github.com/WebAssembly/design/blob/master/Semantics.md#resizing
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#[inline]
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pub unsafe fn current_memory() -> i32 {
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llvm_current_memory()
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}
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/// Corresponding intrinsic to wasm's [`grow_memory` instruction][instr]
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///
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/// This function, when called, will attempt to grow the default linear memory
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/// by the specified number of pages. If memory is successfully grown then the
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/// previous size of memory, in pages, is returned. If memory cannot be grown
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/// then -1 is returned.
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///
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/// [instr]: https://github.com/WebAssembly/design/blob/master/Semantics.md#resizing
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#[inline]
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pub unsafe fn grow_memory(delta: i32) -> i32 {
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llvm_grow_memory(delta)
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}
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