1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
#[cfg(test)] use stdsimd_test::assert_instr; #[cfg(test)] use wasm_bindgen_test::wasm_bindgen_test; extern "C" { #[link_name = "llvm.wasm.memory.grow.i32"] fn llvm_memory_grow(mem: i32, pages: i32) -> i32; #[link_name = "llvm.wasm.memory.size.i32"] fn llvm_memory_size(mem: i32) -> i32; } /// Corresponding intrinsic to wasm's [`memory.size` instruction][instr] /// /// This function, when called, will return the current memory size in units of /// pages. /// /// The argument `mem` is the numerical index of which memory to return the /// size of. Note that currently wasm only supports one memory, so specifying /// a nonzero value will likely result in a runtime validation error of the /// wasm module. /// /// [instr]: https://github.com/WebAssembly/design/blob/master/Semantics.md#resizing #[inline] #[cfg_attr(test, assert_instr("memory.size", mem = 0))] #[rustc_args_required_const(0)] pub unsafe fn size(mem: i32) -> i32 { if mem != 0 { ::intrinsics::abort(); } llvm_memory_size(0) } /// Corresponding intrinsic to wasm's [`memory.grow` instruction][instr] /// /// This function, when called, will attempt to grow the default linear memory /// by the specified `delta` of pages. If memory is successfully grown then the /// previous size of memory, in pages, is returned. If memory cannot be grown /// then -1 is returned. /// /// The argument `mem` is the numerical index of which memory to return the /// size of. Note that currently wasm only supports one memory, so specifying /// a nonzero value will likely result in a runtime validation error of the /// wasm module. /// /// [instr]: https://github.com/WebAssembly/design/blob/master/Semantics.md#resizing #[inline] #[cfg_attr(test, assert_instr("memory.grow", mem = 0))] #[rustc_args_required_const(0)] pub unsafe fn grow(mem: i32, delta: i32) -> i32 { if mem != 0 { ::intrinsics::abort(); } llvm_memory_grow(0, delta) }