commit 1e49864fa7643680c57b3575bf8dbc2a19f9b444
author Andreas Haas <ahaas@chromium.org> Mon Dec 11 13:32:13 2017
committer Commit Bot <commit-bot@chromium.org> Mon Dec 11 14:26:09 2017
tree 8ad4b4411bde95123c819009f80784b13e343194
parent 633144e6d7bad0be7cd2d9daabc0d0ee7e0688a2

[turbofan] Implement on-stack returns (Intel)

Add the ability to return (multiple) return values on the stack:

- Extend stack frames with a new buffer region for return slots.
  This region is located at the end of a caller's frame such that
  its slots can be indexed as caller frame slots in a callee
  (located beyond its parameters) and assigned return values.
- Adjust stack frame constructon and deconstruction accordingly.
- Extend linkage computation to support register plus stack returns.
- Reserve return slots in caller frame when respective calls occur.
- Introduce and generate architecture instructions ('peek') for
  reading back results from return slots in the caller.
- Aggressive tests.
- Some minor clean-up.

So far, only ia32 and x64 are implemented.

Change-Id: I9532ad13aa307c1dec40548c5b84600fe2f762ce
Reviewed-on: https://chromium-review.googlesource.com/766371
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49994}