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tint: Implement pointer alias analysis

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Track reads and writes to pointer parameters for each function in the
Resolver, as well as accesses to module-scope variables. At function
call sites, check the root identifiers of each pointer argument to
determine if problematic aliasing occurs.

The MSL backend passes pointers to sub-objects to functions when
handling workgroup storage variables, which triggers the alias
analysis. Add a validation override for this scenario.

Bug: tint:1675

Change-Id: I81a40d1309df65521cc5ad39764d6a09a260f51e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/110167
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: James Price <jrprice@google.com>
This commit is contained in:
James Price
2022-11-17 17:27:27 +00:00
committed by Dawn LUCI CQ
parent d6f9a8a253
commit 4d65fc91bb
10 changed files with 1128 additions and 0 deletions
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docs/tint/origin-trial-changes.md
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@@ -5,6 +5,8 @@
### Deprecated Features
* The `sig` member of the return type of `frexp()` has been renamed to `fract`. [tint:1757](crbug.com/tint/1757)
* Calling a function with multiple pointer arguments that alias each other is now a warning, and
will become an error in a future release. [tint:1675](crbug.com/tint/1675)
## Changes for M109