* [Ada] Fix internal error on array slice in loop and Loop_Invariant
@ 2019-07-22 14:02 Pierre-Marie de Rodat
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From: Pierre-Marie de Rodat @ 2019-07-22 14:02 UTC (permalink / raw)
To: gcc-patches; +Cc: Eric Botcazou
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This fixes an internal error caused by the presence of an Itype in a
wrong scope. This Itype is created for an array slice present in the
condition of a while loop whose body also contains a pragma
Loop_Invariant, initially in the correct scope but then relocated into a
function created for the pragma.
Tested on x86_64-pc-linux-gnu, committed on trunk
2019-07-22 Eric Botcazou <ebotcazou@adacore.com>
gcc/ada/
* exp_attr.adb (Expand_Loop_Entry_Attribute): Copy the condition
of a while loop instead of simply relocating it.
gcc/testsuite/
* gnat.dg/loop_invariant1.adb, gnat.dg/loop_invariant1.ads: New
testcase.
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--- gcc/ada/exp_attr.adb
+++ gcc/ada/exp_attr.adb
@@ -1384,6 +1384,8 @@ package body Exp_Attr is
Stmts : List_Id;
begin
+ Func_Id := Make_Temporary (Loc, 'F');
+
-- Wrap the condition of the while loop in a Boolean function.
-- This avoids the duplication of the same code which may lead
-- to gigi issues with respect to multiple declaration of the
@@ -1403,7 +1405,9 @@ package body Exp_Attr is
Append_To (Stmts,
Make_Simple_Return_Statement (Loc,
- Expression => Relocate_Node (Condition (Scheme))));
+ Expression =>
+ New_Copy_Tree (Condition (Scheme),
+ New_Scope => Func_Id)));
-- Generate:
-- function Fnn return Boolean is
@@ -1411,7 +1415,6 @@ package body Exp_Attr is
-- <Stmts>
-- end Fnn;
- Func_Id := Make_Temporary (Loc, 'F');
Func_Decl :=
Make_Subprogram_Body (Loc,
Specification =>
--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/loop_invariant1.adb
@@ -0,0 +1,15 @@
+-- { dg-do compile }
+-- { dg-options "-gnata" }
+
+package body Loop_Invariant1 is
+
+ procedure Proc (A : Arr; N : Integer) is
+ I : Integer := A'First;
+ begin
+ while i <= A'Last and then A(A'First .. A'Last) /= A loop
+ pragma Loop_Invariant (N = N'Loop_Entry);
+ i := i + 1;
+ end loop;
+ end;
+
+end Loop_Invariant1;
--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/loop_invariant1.ads
@@ -0,0 +1,7 @@
+package Loop_Invariant1 is
+
+ type Arr is array (Natural range <>) of Integer;
+
+ procedure Proc (A : Arr; N : Integer);
+
+end Loop_Invariant1;
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2019-07-22 14:02 [Ada] Fix internal error on array slice in loop and Loop_Invariant Pierre-Marie de Rodat
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