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Contents
use wasmtime_environ::WasmType;
/// Base register used to address the local slot.
///
/// Slots for stack arguments are addressed from the frame pointer.
/// Slots for function-defined locals and for registers are addressed
/// from the stack pointer.
#[derive(Clone, Eq, PartialEq)]
enum Base {
FP,
SP,
}
/// A local slot.
///
/// Represents the type, location and addressing mode of a local
/// in the stack's local and argument area.
#[derive(Clone)]
pub(crate) struct LocalSlot {
/// The offset of the local slot.
pub offset: u32,
/// The type contained by this local slot.
pub ty: WasmType,
/// Base register associated to this local slot.
base: Base,
}
impl LocalSlot {
/// Creates a local slot for a function defined local or
/// for a spilled argument register.
pub fn new(ty: WasmType, offset: u32) -> Self {
Self {
ty,
offset,
base: Base::SP,
}
}
/// Int32 shortcut for `new`.
pub fn i32(offset: u32) -> Self {
Self {
ty: WasmType::I32,
offset,
base: Base::SP,
}
}
/// Int64 shortcut for `new`.
pub fn i64(offset: u32) -> Self {
Self {
ty: WasmType::I64,
offset,
base: Base::SP,
}
}
/// Creates a local slot for a stack function argument.
pub fn stack_arg(ty: WasmType, offset: u32) -> Self {
Self {
ty,
offset,
base: Base::FP,
}
}
/// Check if the local is addressed from the stack pointer.
pub fn addressed_from_sp(&self) -> bool {
self.base == Base::SP
}
}
Version data entries
12 entries across 12 versions & 1 rubygems