diff options
Diffstat (limited to 'gcc/ada/exp_util.ads')
| -rw-r--r-- | gcc/ada/exp_util.ads | 52 |
1 files changed, 30 insertions, 22 deletions
diff --git a/gcc/ada/exp_util.ads b/gcc/ada/exp_util.ads index 42c8d2ab8f3..737b39728ee 100644 --- a/gcc/ada/exp_util.ads +++ b/gcc/ada/exp_util.ads @@ -6,7 +6,7 @@ -- -- -- S p e c -- -- -- --- Copyright (C) 1992-2007, Free Software Foundation, Inc. -- +-- Copyright (C) 1992-2008, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- @@ -212,43 +212,51 @@ package Exp_Util is -- function itself must do its own cleanups. function Component_May_Be_Bit_Aligned (Comp : Entity_Id) return Boolean; - -- This function is in charge of detecting record components that may cause - -- trouble in the back end if an attempt is made to assign the component. - -- The back end can handle such assignments with no problem if the - -- components involved are small (64-bits or less) records or scalar items - -- (including bit-packed arrays represented with modular types) or are both - -- aligned on a byte boundary (starting on a byte boundary, and occupying - -- an integral number of bytes). + -- This function is in charge of detecting record components that may + -- cause trouble in the back end if an attempt is made to assign the + -- component. The back end can handle such assignments with no problem if + -- the components involved are small (64-bits or less) records or scalar + -- items (including bit-packed arrays represented with modular types) or + -- are both aligned on a byte boundary (starting on a byte boundary, and + -- occupying an integral number of bytes). -- -- However, problems arise for records larger than 64 bits, or for arrays -- (other than bit-packed arrays represented with a modular type) if the -- component starts on a non-byte boundary, or does not occupy an integral - -- number of bytes (i.e. there are some bits possibly shared with fields at - -- the start or beginning of the component). The back end cannot handle + -- number of bytes (i.e. there are some bits possibly shared with fields + -- at the start or beginning of the component). The back end cannot handle -- loading and storing such components in a single operation. -- -- This function is used to detect the troublesome situation. it is - -- conservative in the sense that it produces True unless it knows for sure - -- that the component is safe (as outlined in the first paragraph above). - -- The code generation for record and array assignment checks for trouble - -- using this function, and if so the assignment is generated + -- conservative in the sense that it produces True unless it knows for + -- sure that the component is safe (as outlined in the first paragraph + -- above). The code generation for record and array assignment checks for + -- trouble using this function, and if so the assignment is generated -- component-wise, which the back end is required to handle correctly. -- - -- Note that in GNAT 3, the back end will reject such components anyway, so - -- the hard work in checking for this case is wasted in GNAT 3, but it's - -- harmless, so it is easier to do it in all cases, rather than + -- Note that in GNAT 3, the back end will reject such components anyway, + -- so the hard work in checking for this case is wasted in GNAT 3, but + -- it is harmless, so it is easier to do it in all cases, rather than -- conditionalize it in GNAT 5 or beyond. procedure Convert_To_Actual_Subtype (Exp : Node_Id); - -- The Etype of an expression is the nominal type of the expression, not - -- the actual subtype. Often these are the same, but not always. For - -- example, a reference to a formal of unconstrained type has the + -- The Etype of an expression is the nominal type of the expression, + -- not the actual subtype. Often these are the same, but not always. + -- For example, a reference to a formal of unconstrained type has the -- unconstrained type as its Etype, but the actual subtype is obtained by -- applying the actual bounds. This routine is given an expression, Exp, - -- and (if necessary), replaces it using Rewrite, with a conversion to the - -- actual subtype, building the actual subtype if necessary. If the + -- and (if necessary), replaces it using Rewrite, with a conversion to + -- the actual subtype, building the actual subtype if necessary. If the -- expression is already of the requested type, then it is unchanged. + function Corresponding_Runtime_Package (Typ : Entity_Id) return RTU_Id; + -- Return the id of the runtime package that will provide support for + -- concurrent type Typ. Currently only protected types are supported, + -- and the returned value is one of the following: + -- System_Tasking_Protected_Objects + -- System_Tasking_Protected_Objects_Entries + -- System_Tasking_Protected_Objects_Single_Entry + function Current_Sem_Unit_Declarations return List_Id; -- Return the a place where it is fine to insert declarations for the -- current semantic unit. If the unit is a package body, return the |