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WIP.

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This commit is contained in:
Chris Fallin 2022-11-29 18:03:33 -08:00
parent 9ce0d259b4
commit 5a6177b613
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GPG key ID: 31649E4FE65EB465
2 changed files with 19 additions and 5 deletions
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2
src/backend/mod.rs
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@ -145,7 +145,7 @@ impl<'a> WasmFuncBackend<'a> {
// If this value is "owned", do nothing: it will be lowered in
// the one place it's used.
if self.trees.owner.contains_key(&inst) {
return;
continue;
}
self.lower_inst(inst, /* root = */ true, func);
}

22
src/frontend.rs
View file

@ -1032,6 +1032,7 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
wasmparser::Operator::Return => {
let retvals = self.pop_n(self.module.signature(self.my_sig).returns.len());
self.emit_ret(&retvals[..]);
self.reachable = false;
}
_ => bail!(FrontendError::UnsupportedFeature(format!(
@ -1056,6 +1057,13 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
}
fn handle_ctrl_op(&mut self, op: wasmparser::Operator<'a>) -> Result<bool> {
log::trace!(
"handle_ctrl_op: op {:?} reachable {} cur_block {}",
op,
self.reachable,
self.cur_block
);
log::trace!("ctrl stack: {:?}", self.ctrl_stack);
match &op {
wasmparser::Operator::End => {
let frame = self.ctrl_stack.pop();
@ -1083,6 +1091,7 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
}) => {
// Generate a branch to the out-block with
// blockparams for the results.
let was_reachable = self.reachable;
if self.reachable {
let result_values =
self.block_results(&results[..], *start_depth, self.cur_block);
@ -1100,7 +1109,7 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
// Set `cur_block` only if currently set (otherwise, unreachable!)
self.cur_block = *out;
self.locals.start_block(*out, self.reachable);
self.reachable = self.reachable
self.reachable = was_reachable
|| match &frame {
Some(Frame::Block { out_reachable, .. }) => *out_reachable,
_ => false,
@ -1118,6 +1127,7 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
}) => {
// Generate a branch to the out-block with
// blockparams for the results.
let was_reachable = self.reachable;
if self.reachable {
let result_values =
self.block_results(&results[..], *start_depth, self.cur_block);
@ -1141,7 +1151,6 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
assert_eq!(self.op_stack.len(), *start_depth);
}
self.cur_block = *out;
let was_reachable = self.reachable;
self.reachable = *head_reachable || self.reachable;
self.locals.seal_block_preds(*out, &mut self.body);
self.locals.start_block(*out, was_reachable);
@ -1156,6 +1165,7 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
}) => {
// Generate a branch to the out-block with
// blockparams for the results.
let was_reachable = self.reachable;
if self.reachable {
let result_values =
self.block_results(&results[..], *start_depth, self.cur_block);
@ -1163,7 +1173,6 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
}
self.op_stack.truncate(*start_depth);
self.cur_block = *out;
let was_reachable = self.reachable;
self.reachable = *merge_reachable || self.reachable;
self.locals.seal_block_preds(*out, &mut self.body);
self.locals.start_block(*out, was_reachable);
@ -1334,7 +1343,6 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
};
self.body
.end_block(self.cur_block, Terminator::Br { target });
self.reachable = false;
self.locals.finish_block(true);
}
}
@ -1422,6 +1430,12 @@ impl<'a, 'b> FunctionBodyBuilder<'a, 'b> {
}
fn emit_ret(&mut self, values: &[Value]) {
log::trace!(
"emit_ret: cur_block {} reachable {} values {:?}",
self.cur_block,
self.reachable,
values
);
if self.reachable {
let values = values.to_vec();
self.body