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analyzer: Fix ICE on MD builtin [PR101721]

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The following testcase ICEs because DECL_FUNCTION_CODE asserts the builtin
is BUILT_IN_NORMAL, but it sees a backend (MD) builtin instead.
The FE, normal and MD builtin numbers overlap, so one should always
check what kind of builtin it is before looking at specific codes.

On the other side, region-model.cc has:
      if (fndecl_built_in_p (callee_fndecl, BUILT_IN_NORMAL)
          && gimple_builtin_call_types_compatible_p (call, callee_fndecl))
        switch (DECL_UNCHECKED_FUNCTION_CODE (callee_fndecl))
which IMO should use DECL_FUNCTION_CODE instead, it checked first it is
a normal builtin...

2021-08-03  Jakub Jelinek  <jakub@redhat.com>

	PR analyzer/101721
	* sm-malloc.cc (known_allocator_p): Only check DECL_FUNCTION_CODE on
	BUILT_IN_NORMAL builtins.

	* gcc.dg/analyzer/pr101721.c: New test.
This commit is contained in:
Jakub Jelinek 2021-08-03 12:44:17 +02:00
parent 872c1a56e3
commit 1a830c0636
2 changed files with 9 additions and 1 deletions
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2
gcc/analyzer/sm-malloc.cc
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@ -1543,7 +1543,7 @@ known_allocator_p (const_tree fndecl, const gcall *call)
/* ... or it is a builtin allocator that allocates objects freed with
__builtin_free. */
if (fndecl_built_in_p (fndecl))
if (fndecl_built_in_p (fndecl, BUILT_IN_NORMAL))
switch (DECL_FUNCTION_CODE (fndecl))
{
case BUILT_IN_MALLOC:

8
gcc/testsuite/gcc.dg/analyzer/pr101721.c Normal file
View file

@ -0,0 +1,8 @@
/* PR analyzer/101721 */
/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
void
foo ()
{
__builtin_ia32_pause ();
}