skia2

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Add fix for fuzzer-discovered crash at oss-fuzz:27614. The fuzzer managed to create a test case which temporarily evaluates to expression `half2(half(0.2)) + 2` as it is optimized. This requires a bunch of temporary nonsense math as the IR Generator is attempting to simplify as it goes; various attempts to remove terms from the fuzzer test-case would cause it to stop reproducing the error. Constructor::getVecComponent assumed that any constructor with a single scalar argument would always implement `getConstantFloat` and `getConstantInt`; however, constructors themselves did not actually implement these methods. This meant that nesting a scalar constructor inside a non-scalar constructor would abort when it tried to deduce the value inside the inner constructor. This has been fixed by implementing `getConstantFloat` and `getConstantInt` for Constructors. These methods will assert if the constructor has more than one argument or is a non-scalar type. This should allow any number of nested constructors, e.g. `half4(half(half(half(1))))` should recursively evaluate properly, should we somehow generate this as an intermediate expression. Change-Id: Iaee4284cba03974443cd7b5dccfd7909c1a5f3a6 Bug: oss-fuzz:27614 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335868 Commit-Queue: John Stiles <johnstiles@google.com> Commit-Queue: Brian Osman <brianosman@google.com> Auto-Submit: John Stiles <johnstiles@google.com> Reviewed-by: Brian Osman <brianosman@google.com> 2020-11-18 20:18:40 +00:00
			`void main() {`
			`}`

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