[Ada] Crash on discriminant check with current instance

Pierre-Marie de Rodat derodat@adacore.com
Thu Dec 17 10:50:08 GMT 2020


This patch fixes an issue in the compiler whereby a reference to the
current instance of the type occurring within a subtype contraint causes
a crash during backend expansion of associated discriminant checks.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* checks.adb (Build_Discriminant_Checks): Add condition to
	replace references to the current instance of the type when we
	are within an Init_Proc.
	(Replace_Current_Instance): Examine a given node and replace the
	current instance of the type with the corresponding _init
	formal.
	(Search_And_Replace_Current_Instance): Traverse proc which calls
	Replace_Current_Instance in order to replace all references
	within a given expression.
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