bjoernager/rust
bjoernager/rust
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Add stack traces to error notes.

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This commit is contained in:
Scott Olson 2016-03-30 22:04:53 -06:00
parent 17df5cfec3
commit d25ddb3130
1 changed files with 25 additions and 3 deletions
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28
src/interpreter.rs
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@ -50,6 +50,12 @@ struct Interpreter<'a, 'tcx: 'a, 'arena> {
/// exists separately from `stack` because it must contain the `Substs` for a function while
/// *creating* the `Frame` for that same function.
substs_stack: Vec<&'tcx Substs<'tcx>>,
// TODO(tsion): Merge with `substs_stack`. Also try restructuring `Frame` to accomodate.
/// A stack of the things necessary to print good strack traces:
/// * Function DefIds and Substs to print proper substituted function names.
/// * Spans pointing to specific function calls in the source.
name_stack: Vec<(DefId, &'tcx Substs<'tcx>, codemap::Span)>,
}
/// A stack frame.
@ -119,12 +125,26 @@ impl<'a, 'tcx: 'a, 'arena> Interpreter<'a, 'tcx, 'arena> {
memory: Memory::new(),
stack: Vec::new(),
substs_stack: Vec::new(),
name_stack: Vec::new(),
}
}
fn maybe_report<T>(&self, span: codemap::Span, r: EvalResult<T>) -> EvalResult<T> {
if let Err(ref e) = r {
let mut err = self.tcx.sess.struct_span_err(span, &e.to_string());
for &(def_id, substs, span) in self.name_stack.iter().rev() {
// FIXME(tsion): Find a way to do this without this Display impl hack.
use rustc::util::ppaux;
use std::fmt;
struct Instance<'tcx>(DefId, &'tcx Substs<'tcx>);
impl<'tcx> fmt::Display for Instance<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
ppaux::parameterized(f, self.1, self.0, ppaux::Ns::Value, &[],
|tcx| tcx.lookup_item_type(self.0).generics)
}
}
err.span_note(span, &format!("inside call to {}", Instance(def_id, substs)));
}
err.emit();
}
r
@ -161,6 +181,7 @@ impl<'a, 'tcx: 'a, 'arena> Interpreter<'a, 'tcx, 'arena> {
TerminatorTarget::Block(block) => current_block = block,
TerminatorTarget::Return => {
self.pop_stack_frame();
self.name_stack.pop();
continue 'outer;
}
TerminatorTarget::Call => continue 'outer,
@ -288,7 +309,7 @@ impl<'a, 'tcx: 'a, 'arena> Interpreter<'a, 'tcx, 'arena> {
// FnMut closure via FnOnce::call_once.
// Only trait methods can have a Self parameter.
let (def_id, substs) = if substs.self_ty().is_some() {
let (resolved_def_id, resolved_substs) = if substs.self_ty().is_some() {
self.trait_method(def_id, substs)
} else {
(def_id, substs)
@ -318,8 +339,9 @@ impl<'a, 'tcx: 'a, 'arena> Interpreter<'a, 'tcx, 'arena> {
}
}
let mir = self.load_mir(def_id);
self.push_stack_frame(mir, substs, return_ptr);
let mir = self.load_mir(resolved_def_id);
self.name_stack.push((def_id, substs, terminator.span));
self.push_stack_frame(mir, resolved_substs, return_ptr);
for (i, (src, size)) in arg_srcs.into_iter().enumerate() {
let dest = self.frame().locals[i];