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(#2958)
* Simplify type of diagnoseImpl
* Show source line for Note diagnostics, opting out of this where appropriate
* Make declared after use diagnostic clearer
* Fix erroneous error claiming variable is being used before its declaration
Closes https://github.com/shader-slang/slang/issues/2936
* Fix build on msvc
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Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* WIP: First pass in supporting output of line error information.
* Add support for lexing to better be able to indicate SourceLocation information.
* Fix lexer usage in DiagnosticSink in C++ extractor.
* Update diagnostics tests to have line location info.
* Fixed test expected output that now have source location information in them.
* Better handling of tab.
* Fix test expected results for tabbing change.
* DiagnosticLexer -> DiagnosticSink::SourceLocationLexer
Added line continuation tests.
* Fix typo.
* Added String::appendRepeatedChar
* Change to rerun tests.
Co-authored-by: Tim Foley <tfoleyNV@users.noreply.github.com>
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The basic problem here arises when a local variable is used either before its own declaration:
```hlsl
int a = b;
...
int b = 0;
```
or when a local variable is used *in* its own decalration:
```hlsl
int b = b;
```
In each case, Slang considers the scope of the `{}`-enclosed function body (or nested statement) as a whole, and so the lookup can "see" the declaration even if it is later in the same function.
This behavior isn't really correct for HLSL semantics, so the right long-term fix is to change our scoping rules, but for now users really just want the compiler to not crash on code like this, and give an error message that points at the issue.
This change makes both of the above examples print an error message saying that variable `b` was used before its declaration, which is accurate to the way that Slang is interpreting those code examples.
This is currently treated as a fatal error, so that compilation aborts right away, to avoid all of the downstream crashes that these cases were causing.
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