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2011-09-06 Steve Baird <baird@adacore.com> * einfo.ads (Extra_Accessibility_Of_Result): New function; in the (Ada2012) cases described in AI05-0234 where the accessibility level of a function result is "determined by the point of call", an implicit parameter representing that accessibility level is passed in. Extra_Accessibilty_Of_Result yields this additional formal parameter. Extra_Accessibility_Of_Result is analogous to the existing Extra_Accessibility function used in the implementation of access parameters. (Set_Extra_Accessibility_Of_Result): New procedure; sets Extra_Accessibility_Of_Result attribute. * einfo.adb (Extra_Accessibility_Of_Result): New function. (Set_Extra_Accessibility_Of_Result): New procedure. (Write_Field19_Name): Display Extra_Accessibilty_Of_Result attribute. * sem_util.adb (Dynamic_Accessibility_Level): Set Etype of an accessibility level literal to Natural; introduce a nested function, Make_Level_Literal, to do this. * exp_ch6.ads (Needs_Result_Accessibility_Level): New function; determines whether a given function (or access-to-function type) needs to have an implicitly-declared accessibility-level parameter added to its profile. (Add_Extra_Actual_To_Call): Export an existing procedure which was previously declared in the body of Exp_Ch6. * exp_ch6.adb (Add_Extra_Actual_To_Call): Export declaration by moving it to exp_ch6.ads. (Has_Unconstrained_Access_Discriminants): New Function; a predicate on subtype entities which returns True if the given subtype is unconstrained and has one or more access discriminants. (Expand_Call): When expanding a call to a function which takes an Extra_Accessibility_Of_Result parameter, pass in the appropriate actual parameter value. In the case of a function call which is used to initialize an allocator, this may not be possible because the Etype of the allocator may not have been set yet. In this case, we defer passing in the parameter and handle it later in Expand_Allocator_Expression. (Expand_Simple_Function_Return): When returning from a function which returns an unconstrained subtype having at least one access discriminant, generate the accessibility check needed to ensure that the function result will not outlive any objects designated by its discriminants. (Needs_Result_Accessibility_Level): New function; see exp_ch6.ads description. * exp_ch4.adb (Expand_Allocator_Expression): When a function call is used to initialize an allocator, we may need to pass in "the accessibility level determined by the point of call" (AI05-0234) to the function. Expand_Call, where such actual parameters are usually generated, is too early in this case because the Etype of the allocator (which is used in determining the level to be passed in) may not have been set yet when Expand_Call executes. Instead, we generate code to pass in the appropriate actual parameter in Expand_Allocator_Expression. * sem_ch6.adb (Create_Extra_Formals): Create the new Extra_Accessibility_Of_Result formal if Needs_Result_Accessibility_Level returns True. This includes the introduction of a nested procedure, Check_Against_Result_Level. From-SVN: r178567 |
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