Const-Qualify LangOptions and TypeCheckerOptions #31721
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harlanhaskins
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May 12, 2020
I'll get it in a follow-up. |
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…bodies This allows us to push the validation and, importantly, the mutation of this flag into the compiler invocation where it belongs.
The constraint system will need this if it wants to disable debug mode for serialized modules
This eliminates the final source of mutation of the TypeCheckerFlags on the ASTContext.
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This required moving aside the hacks that necessitated mutating these options outside of the frontend.
For LangOptions,
-experimental-skip-function-bodieswas silently disabling itself if the module under scrutiny wasSwiftOnoneSupport. Push this computation into the frontend and warn about it.For TypeCheckerOptions the main offender was the expression checker's debugging flags. For these, add a bit to
ConstraintSystemFlagsand convert the save-and-restore patterns to use that instead. A beneficial behavior where constraint debugging was turned off for loaded modules is being emulated by plumbing the notion of the "main module" intoModuleDeclitself.