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Use the new capability in a new test of RTT behavior that will be fixed in #4284,
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The upstream name of the command in LLVM is FileCheck, but we use a Python
package called filecheck instead and using `FileCheck` in lit tests will not
work. To make catching this common error easier, add a warning about it in
scripts/update_lit_checks.py. This warning also applies to other uses of pipes,
which are not supported in this script.
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In conjunction with the `foreach` tool, allows autogenerating checks for lit
tests containing multiple modules. Supporting this will help automatically port
existing bespoke wast tests to be lit tests, since many of those tests contain
multiple modules per file.
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Decompose the code into more functions and make other simplifying changes to
prepare for multi-module support introduced in #3962.
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Add an --all-items flag to update_lit_checks.py to emit checks for all module
items, not just those that match items in the input. Update two tests to use
generated input with the new flag.
Also, to improve readability, insert an empty line between consecutive checks
for different items.
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Instead of only generating checks for functions, generate checks for all named top-level module items, such as types, tags, tables, and memories. Because module items can be in different orders in the input and the output but FileCheck checks must follow the order of the output, we need to be slightly clever about when we emit the checks. Consider these types in the input file:
```
(type $A (...))
(type $B (...))
```
If their order is reversed in the output file, then the checks for $B need to be emitted before the checks for $A, so the resulting module will look like this:
```
;; CHECK: (type $B (...))
;; CHECK: (type $A (...))
(type $A (...))
(type $B (...))
```
Rather than this, which looks nicer but would be incorrect:
```
;; CHECK: (type $A (...))
(type $A (...))
;; CHECK: (type $B (...))
(type $B (...))
```
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And demonstrate its capabilities by porting all tests of the
optimize-instructions pass to use lit and FileCheck.
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