* [COMMITTED] ada: Facilitate proof of Interfaces.C.To_Ada
@ 2023-05-23 8:08 Marc Poulhiès
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From: Marc Poulhiès @ 2023-05-23 8:08 UTC (permalink / raw)
To: gcc-patches; +Cc: Yannick Moy
From: Yannick Moy <moy@adacore.com>
Nightly runs of GNATprove fail on proof of the assertion following
the loop. Add a loop invariant to facilitate that proof.
gcc/ada/
* libgnat/i-c.adb (To_Ada): Add loop invariant.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/libgnat/i-c.adb | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/ada/libgnat/i-c.adb b/gcc/ada/libgnat/i-c.adb
index 9236189fc15..63aa2a2d53b 100644
--- a/gcc/ada/libgnat/i-c.adb
+++ b/gcc/ada/libgnat/i-c.adb
@@ -605,6 +605,7 @@ is
pragma Loop_Invariant
(for all J in Item'First .. From when J /= From =>
Item (J) /= char32_nul);
+ pragma Loop_Invariant (From <= Item'First + C_Length_Ghost (Item));
pragma Loop_Variant (Increases => From);
if From > Item'Last then
--
2.40.0
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