[PATCH] Fix PR67055

[Richard Biener]

The inliner decides sth stupid here (IMHO - inlining a function into
a thunk) but at least we shouldn't crash (the tailcall in the thunk
has no BLOCK associated with it).

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2015-08-05  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/67055
        * tree-ssa-ccp.c (fold_builtin_alloca_with_align): Handle
        NULL gimple_block.

        * g++.dg/torture/pr67055.C: New testcase.

Index: gcc/tree-ssa-ccp.c
===================================================================
--- gcc/tree-ssa-ccp.c  (revision 226577)
+++ gcc/tree-ssa-ccp.c  (working copy)
@@ -2107,6 +2120,7 @@ fold_builtin_alloca_with_align (gimple s
      as a declared array, so we allow a larger size.  */
   block = gimple_block (stmt);
   if (!(cfun->after_inlining
+       && block
         && TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL))
     threshold /= 10;
   if (size > threshold)
Index: gcc/testsuite/g++.dg/torture/pr67055.C
===================================================================
--- gcc/testsuite/g++.dg/torture/pr67055.C      (revision 0)
+++ gcc/testsuite/g++.dg/torture/pr67055.C      (working copy)
@@ -0,0 +1,44 @@
+// { dg-do compile }
+// { dg-additional-options "-std=c++14" }
+
+namespace std {
+    typedef __SIZE_TYPE__ size_t;
+    struct nothrow_t;
+}
+namespace vespamalloc {
+    void fn1(void *);
+    template <typename> class A {
+    public:
+       static unsigned long fillStack(unsigned long);
+    };
+    template <typename StackRep>
+       unsigned long A<StackRep>::fillStack(unsigned long p1) {
+           void *retAddr[p1];
+           fn1(retAddr);
+       }
+    class B {
+    protected:
+       B(void *);
+    };
+    template <int StackTraceLen> class D : B {
+    public:
+       D() : B(0) {}
+       void alloc(int) { A<int>::fillStack(StackTraceLen); }
+    };
+    template <typename, typename> class C {
+    public:
+       void *malloc(unsigned long);
+    };
+    template <typename MemBlockPtrT, typename ThreadListT>
+       void *C<MemBlockPtrT, ThreadListT>::malloc(unsigned long) {
+           MemBlockPtrT mem;
+           mem.alloc(0);
+       }
+    C<D<16>, int> *_GmemP;
+}
+void *operator new(std::size_t, std::nothrow_t &) noexcept {
+    return vespamalloc::_GmemP->malloc(0);
+}
+void *operator new[](std::size_t, std::nothrow_t &) noexcept {
+    return vespamalloc::_GmemP->malloc(0);
+}