[COMMITTED] ada: Tune warning about assignment just before a raise statement
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Commit Message
From: Piotr Trojanek <trojanek@adacore.com>
Tune warning about a possibly ineffective assignment to a formal
parameter that happens just before a raise statement.
The warning is now emitted for parameters of all by-copy types and not
just of scalar types (this gives more warnings), but is suppressed for
aliased parameters (this removes some spurious warnings).
gcc/ada/
* sem_ch11.adb (Analyze_Raise_Expression): Tune warning condition.
* libgnat/g-dirope.ads (Open): Remove a potentially inaccurate comment.
* libgnat/g-dirope.adb (Open): Remove a potentially useless assignment;
the Dir output parameter should be assigned a null value anyway by the
preceding call to Free.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/libgnat/g-dirope.adb | 1 -
gcc/ada/libgnat/g-dirope.ads | 3 +--
gcc/ada/sem_ch11.adb | 7 ++++---
3 files changed, 5 insertions(+), 6 deletions(-)
@@ -636,7 +636,6 @@ package body GNAT.Directory_Operations is
if not Is_Open (Dir) then
Free (Dir);
- Dir := Null_Dir;
raise Directory_Error;
end if;
end Open;
@@ -210,8 +210,7 @@ package GNAT.Directory_Operations is
procedure Open (Dir : out Dir_Type; Dir_Name : Dir_Name_Str);
-- Opens the directory named by Dir_Name and returns a Dir_Type value
-- that refers to this directory, and is positioned at the first entry.
- -- Raises Directory_Error if Dir_Name cannot be accessed. In that case
- -- Dir will be set to Null_Dir.
+ -- Raises Directory_Error if Dir_Name cannot be accessed.
procedure Close (Dir : in out Dir_Type);
-- Closes the directory stream referred to by Dir. After calling Close
@@ -543,11 +543,12 @@ package body Sem_Ch11 is
if Present (P) and then Nkind (P) = N_Assignment_Statement then
L := Name (P);
- -- Give warning for assignment to scalar formal
+ -- Give warning for assignment to by-copy formal
- if Is_Scalar_Type (Etype (L))
- and then Is_Entity_Name (L)
+ if Is_Entity_Name (L)
and then Is_Formal (Entity (L))
+ and then Is_By_Copy_Type (Etype (L))
+ and then not Is_Aliased (Entity (L))
-- Do this only for parameters to the current subprogram.
-- This avoids some false positives for the nested case.