Track memory usage
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899cc32e45
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@ -58,6 +58,7 @@ pub struct MemoryInstance {
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initial: Pages,
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current_size: Cell<usize>,
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maximum: Option<Pages>,
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lowest_used: Cell<u32>,
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}
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impl fmt::Debug for MemoryInstance {
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@ -127,6 +128,7 @@ impl MemoryInstance {
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initial: initial,
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current_size: Cell::new(initial_size.0),
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maximum: maximum,
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lowest_used: Cell::new(u32::max_value()),
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}
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}
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@ -148,6 +150,16 @@ impl MemoryInstance {
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self.maximum
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}
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/// Returns lowest offset ever written or `u32::max_value()` if none.
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pub fn lowest_used(&self) -> u32 {
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self.lowest_used.get()
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}
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/// Resets tracked lowest offset.
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pub fn reset_lowest_used(&self, addr: u32) {
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self.lowest_used.set(addr)
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}
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/// Returns current linear memory size.
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///
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/// Maximum memory size cannot exceed `65536` pages or 4GiB.
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@ -171,6 +183,11 @@ impl MemoryInstance {
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Bytes(self.current_size.get()).round_up_to()
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}
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/// Returns current used memory size in bytes.
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pub fn used_size(&self) -> Bytes {
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Bytes(self.buffer.borrow().len())
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}
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/// Get value from memory at given offset.
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pub fn get_value<T: LittleEndianConvert>(&self, offset: u32) -> Result<T, Error> {
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let mut buffer = self.buffer.borrow_mut();
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@ -213,6 +230,9 @@ impl MemoryInstance {
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.checked_region(&mut buffer, offset as usize, value.len())?
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.range();
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if offset < self.lowest_used.get() {
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self.lowest_used.set(offset);
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}
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buffer[range].copy_from_slice(value);
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Ok(())
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@ -224,6 +244,9 @@ impl MemoryInstance {
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let range = self
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.checked_region(&mut buffer, offset as usize, ::core::mem::size_of::<T>())?
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.range();
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if offset < self.lowest_used.get() {
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self.lowest_used.set(offset);
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}
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value.into_little_endian(&mut buffer[range]);
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Ok(())
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}
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@ -474,7 +497,12 @@ impl MemoryInstance {
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///
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/// Returns `Err` if the specified region is out of bounds.
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pub fn zero(&self, offset: usize, len: usize) -> Result<(), Error> {
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self.clear(offset, 0, len)
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if (offset + len) >= self.buffer.borrow().len() {
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self.buffer.borrow_mut().resize(offset, 0u8);
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Ok(())
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} else {
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self.clear(offset, 0, len)
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}
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}
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/// Provides direct access to the underlying memory buffer.
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