From: Pádraig Brady <p@draigbrady.com>
Date: Wed, 5 Sep 2018 09:59:08 +0000 (+0000)
Subject: [PR c++/87185] ICE in prune-lambdas
X-Git-Tag: releases/gcc-9.1.0~4412
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=86e95f35c522136ee6ec8b648b2fd415360774bc;p=thirdparty%2Fgcc.git

[PR c++/87185] ICE in prune-lambdas

https://gcc.gnu.org/ml/gcc-patches/2018-09/msg00249.html
	cp/
	PR c++/87185
	* lambda.c (prune_lambda_captures): Protect against const_vars.get
	returning NULL.
	testsuite/
	PR c++/87185
	* g++.dg/pr87185.C: New.

From-SVN: r264118
---

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 3fbfe18bd438..498b1fa9252b 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2018-09-05   Pádraig Brady p@draigbrady.com
+
+	PR c++/87185
+	* lambda.c (prune_lambda_captures): Protect against const_vars.get
+	returning NULL.
+
 2018-09-04  Marek Polacek  <polacek@redhat.com>
 
 	* cp-tree.h (treat_lvalue_as_rvalue_p): Declare.
diff --git a/gcc/cp/lambda.c b/gcc/cp/lambda.c
index 25a4d6f7eef4..297327f1ab6b 100644
--- a/gcc/cp/lambda.c
+++ b/gcc/cp/lambda.c
@@ -1519,8 +1519,8 @@ prune_lambda_captures (tree body)
       tree cap = *capp;
       if (tree var = var_to_maybe_prune (cap))
 	{
-	  tree *use = *const_vars.get (var);
-	  if (TREE_CODE (*use) == DECL_EXPR)
+	  tree **use = const_vars.get (var);
+	  if (use && TREE_CODE (**use) == DECL_EXPR)
 	    {
 	      /* All uses of this capture were folded away, leaving only the
 		 proxy declaration.  */
@@ -1535,7 +1535,7 @@ prune_lambda_captures (tree body)
 	      *fieldp = DECL_CHAIN (*fieldp);
 
 	      /* And remove the capture proxy declaration.  */
-	      *use = void_node;
+	      **use = void_node;
 	      continue;
 	    }
 	}
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index a4db4f8c5172..2b2278419291 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-09-05   Pádraig Brady p@draigbrady.com
+
+	PR c++/87185
+	* g++.dg/pr87185.C: New.
+
 2018-09-05  Martin Liska  <mliska@suse.cz>
 
 	PR testsuite/87216
diff --git a/gcc/testsuite/g++.dg/pr87185.C b/gcc/testsuite/g++.dg/pr87185.C
new file mode 100644
index 000000000000..46dae0eec0ff
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr87185.C
@@ -0,0 +1,4 @@
+// PR c++/87185
+// { dg-do compile { target c++11 } }
+
+void f() { const int i=0; [&]() noexcept {i;}; }