cbf2d2d292
Change-Id: Ic6710c609ed647bfa47d673aaf22c4da96c0f319 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6451 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
41 lines
1 KiB
Rust
41 lines
1 KiB
Rust
//! Implements methods for disassembling and printing a representation
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//! of compiled code, as well as tracing the runtime stack during
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//! execution.
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use std::io::{Stderr, Write};
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use tabwriter::TabWriter;
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use crate::opcode::OpCode;
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use crate::value::Value;
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/// Helper struct to trace runtime values and automatically flush the
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/// output after the value is dropped (i.e. in both success and
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/// failure exits from the VM).
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pub struct Tracer(TabWriter<Stderr>);
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impl Default for Tracer {
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fn default() -> Self {
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Tracer(TabWriter::new(std::io::stderr()))
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}
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}
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impl Tracer {
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pub fn trace(&mut self, op: &OpCode, ip: usize, stack: &[Value]) {
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let _ = write!(&mut self.0, "{:04} {:?}\t[ ", ip, op);
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for val in stack {
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let _ = write!(&mut self.0, "{} ", val);
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}
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let _ = writeln!(&mut self.0, "]");
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}
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pub fn literal(&mut self, line: &str) {
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let _ = writeln!(&mut self.0, "{}", line);
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}
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}
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impl Drop for Tracer {
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fn drop(&mut self) {
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let _ = self.0.flush();
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}
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}
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