b2a314a229
Source locations are opaque 32-bit entities that can be used to represent WebAssembly byte-code positions or some other source identifier.
63 lines
1.6 KiB
Rust
63 lines
1.6 KiB
Rust
//! Source locations.
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//!
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//! Cretonne tracks the original source location of each instruction, and preserves the source
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//! location when instructions are transformed.
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use std::fmt;
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/// A source location.
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///
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/// This is an opaque 32-bit number attached to each Cretonne IL instruction. Cretonne does not
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/// interpret source locations in any way, they are simply preserved from the input to the output.
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///
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/// The default source location uses the all-ones bit pattern `!0`. It is used for instructions
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/// that can't be given a real source location.
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#[derive(Clone, Copy, Debug, PartialEq, Eq)]
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pub struct SourceLoc(u32);
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impl SourceLoc {
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/// Create a new source location with the given bits.
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pub fn new(bits: u32) -> SourceLoc {
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SourceLoc(bits)
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}
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/// Is this the default source location?
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pub fn is_default(self) -> bool {
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self == Default::default()
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}
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/// Read the bits of this source location.
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pub fn bits(self) -> u32 {
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self.0
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}
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}
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impl Default for SourceLoc {
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fn default() -> SourceLoc {
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SourceLoc(!0)
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}
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}
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impl fmt::Display for SourceLoc {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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if self.is_default() {
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write!(f, "@-")
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} else {
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write!(f, "@{:04x}", self.0)
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use ir::SourceLoc;
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#[test]
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fn display() {
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assert_eq!(SourceLoc::default().to_string(), "@-");
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assert_eq!(SourceLoc::new(0).to_string(), "@0000");
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assert_eq!(SourceLoc::new(16).to_string(), "@0010");
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assert_eq!(SourceLoc::new(0xabcdef).to_string(), "@abcdef");
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}
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}
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