Making it easier to work with shaders https://git.yummers.dev/slang.git/atom?h=master 2017-10-30T16:40:04+00:00 2017-10-30T16:40:04+00:00 Tim Foley tfoley@nvidia.com 2017-10-30T15:54:09+00:00 urn:sha1:42f1cff5c1471e6bc3988a9810c20b8bcc1c84dd This is the first step towards supporting traditional object-oriented method definitions; the second step will be to allow `this` expressions to be implicit. - Add a test case using explicit `this`, and expected output - Update parsing logic for expressions so that it handled identifiers similarly to the declaration and statement logic: first try to parse using a syntax declaration looked up in the curent scope, and otherwise fall back to the ordinary `VarExpr` case. * As long as I'm making that change: switch `true` and `false` to be parsed via the callback mechanism rather than be special-cased. * This change will also help out if we ever wanted to add `super`/`base` expressions, `new`, `sizeof`/`alignof` or any other expression keywords. - Add a `ThisExpr` node and register a parser callback for it. - Add semantic checks for `ThisExpr`: basically just look upwards through scopes until we find either an aggregate type declaration or an `extension` declaration, and then use that as the type of the expression. - TODO: eventually we need to guard against a `this` expression inside of a `static` member. - The IR generation logic already handled creation of `this` parameters in function signatures; the missing piece was to register the appropriate parameter in the context, so that we can use it as the lowering of a `this` expression.