From 086882b1c8faa8f99f98a9219ccec42d89db50c2 Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Mon, 17 May 2021 14:47:08 +0200
Subject: [PATCH] c/100625 - avoid building invalid labels in the GIMPLE FE
When duplicate labes are diagnosed, avoid building a GIMPLE_LABEL.
2021-05-17 Richard Biener <rguenther@suse.de>
PR c/100625
gcc/c/
* gimple-parser.c (c_parser_gimple_label): Avoid building
a GIMPLE label with NULL label decl.
gcc/testsuite/
* gcc.dg/gimplefe-error-9.c: New testcase.
---
gcc/c/gimple-parser.c | 3 ++-
gcc/testsuite/gcc.dg/gimplefe-error-9.c | 9 +++++++++
2 files changed, 11 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/gimplefe-error-9.c
diff --git a/gcc/c/gimple-parser.c b/gcc/c/gimple-parser.c
index 3a6e72ef0028..398e21631d9a 100644
--- a/gcc/c/gimple-parser.c
+++ b/gcc/c/gimple-parser.c
@@ -1887,7 +1887,8 @@ c_parser_gimple_label (gimple_parser &parser, gimple_seq *seq)
gcc_assert (c_parser_next_token_is (parser, CPP_COLON));
c_parser_consume_token (parser);
tree label = define_label (loc1, name);
- gimple_seq_add_stmt_without_update (seq, gimple_build_label (label));
+ if (label)
+ gimple_seq_add_stmt_without_update (seq, gimple_build_label (label));
return;
}
diff --git a/gcc/testsuite/gcc.dg/gimplefe-error-9.c b/gcc/testsuite/gcc.dg/gimplefe-error-9.c
new file mode 100644
index 000000000000..87014c1cbbfe
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/gimplefe-error-9.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-fgimple" } */
+
+void __GIMPLE
+foo()
+{
+bb1:
+bb1:; /* { dg-error "duplicate" } */
+}
--
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