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[Ada] SPARK pointer support extended to local borrowers and observers 

SPARK rules allow local borrowers and observers to be declared. During
their lifetime, the access to the borrowed/observed object is
restricted.

There is no impact on compilation.

2019-07-03  Yannick Moy  <moy@adacore.com>

gcc/ada/

	* sem_spark.adb: Add support for locally borrowing and observing
	a path.
	(Get_Root_Object): Add parameter Through_Traversal to denote
	when we are interesting in getting to the traversed parameter.
	(Is_Prefix_Or_Almost): New function to support detection of
	illegal access to borrowed or observed paths.
	(Check_Pragma): Add analysis of assertion pragmas.

From-SVN: r272975
This commit is contained in:
Yannick Moy 2019-07-03 08:14:52 +00:00 committed by Pierre-Marie de Rodat
parent 558241c0f7
commit 14bc12f0b1
2 changed files with 709 additions and 178 deletions
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10
gcc/ada/ChangeLog
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@ -1,3 +1,13 @@
2019-07-03 Yannick Moy <moy@adacore.com>
* sem_spark.adb: Add support for locally borrowing and observing
a path.
(Get_Root_Object): Add parameter Through_Traversal to denote
when we are interesting in getting to the traversed parameter.
(Is_Prefix_Or_Almost): New function to support detection of
illegal access to borrowed or observed paths.
(Check_Pragma): Add analysis of assertion pragmas.
2019-07-03 Ed Schonberg <schonberg@adacore.com>
* sem_ch13.adb (Build_Predicate_Functions): In a generic context

877
gcc/ada/sem_spark.adb
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