Richard wrote:
I think you can't rely on pointer equivalence of the lookup_attribute
result so you want instead of
Thanks, makes sense.
Please also name CIF_OPTION_MISMATCH as CIF_ATTRIBUTE_MISMATCH
and say "function attribute mismatch" in the description.
Done.
What about updated patch?
-Y
PR sanitizer/59600
gcc/ChangeLog:
2014-01-21 ygribov
* cif-code.def (ATTRIBUTE_MISMATCH): New CIF code.
* ipa-inline.c (report_inline_failed_reason): Handle mismatched
sanitization attributes.
(sanitize_attrs_match_for_inline_p): New function.
(can_inline_edge_p): Likewise.
gcc/testsuite/ChangeLog:
2014-01-21 ygribov
* gcc.dg/asan/nosanitize-and-inline.c: : New test.
diff --git a/gcc/cif-code.def b/gcc/cif-code.def
index 5591f9a..71f3e39 100644
--- a/gcc/cif-code.def
+++ b/gcc/cif-code.def
@@ -123,3 +123,7 @@ DEFCIFCODE(OPTIMIZATION_MISMATCH, CIF_FINAL_ERROR,
/* We can't inline because the callee refers to comdat-local symbols. */
DEFCIFCODE(USES_COMDAT_LOCAL, CIF_FINAL_NORMAL,
N_("callee refers to comdat-local symbols"))
+
+/* We can't inline because of mismatched caller/callee attributes. */
+DEFCIFCODE(ATTRIBUTE_MISMATCH, CIF_FINAL_NORMAL,
+ N_("function attribute mismatch"))
diff --git a/gcc/ipa-inline.c b/gcc/ipa-inline.c
index 5f47e0b..ce24ea5 100644
--- a/gcc/ipa-inline.c
+++ b/gcc/ipa-inline.c
@@ -234,7 +234,25 @@ report_inline_failed_reason (struct cgraph_edge *e)
}
}
-/* Decide if we can inline the edge and possibly update
+ /* Decide whether sanitizer-related attributes allow inlining. */
+
+static bool
+sanitize_attrs_match_for_inline_p (const_tree caller, const_tree callee)
+{
+ /* Don't care if sanitizer is disabled */
+ if (!(flag_sanitize & SANITIZE_ADDRESS))
+return true;
+
+ if (!caller || !callee)
+return true;
+
+ return !!lookup_attribute ("no_sanitize_address",
+ DECL_ATTRIBUTES (caller)) ==
+ !!lookup_attribute ("no_sanitize_address",
+ DECL_ATTRIBUTES (callee));
+}
+
+ /* Decide if we can inline the edge and possibly update
inline_failed reason.
We check whether inlining is possible at all and whether
caller growth limits allow doing so.
@@ -327,6 +345,12 @@ can_inline_edge_p (struct cgraph_edge *e, bool report,
e->inline_failed = CIF_TARGET_OPTION_MISMATCH;
inlinable = false;
}
+ /* Don't inline a function with mismatched sanitization attributes. */
+ else if (!sanitize_attrs_match_for_inline_p (e->caller->decl, callee->decl))
+{
+ e->inline_failed = CIF_ATTRIBUTE_MISMATCH;
+ inlinable = false;
+}
/* Check if caller growth allows the inlining. */
else if (!DECL_DISREGARD_INLINE_LIMITS (callee->decl)
&& !disregard_limits
diff --git a/gcc/testsuite/gcc.dg/asan/nosanitize-and-inline.c b/gcc/testsuite/gcc.dg/asan/nosanitize-and-inline.c
index e69de29..5853801 100644
--- a/gcc/testsuite/gcc.dg/asan/nosanitize-and-inline.c
+++ b/gcc/testsuite/gcc.dg/asan/nosanitize-and-inline.c
@@ -0,0 +1,57 @@
+/* { dg-do run } */
+
+/* This is a simplified version of what Emacs does internally,
+ when marking its stack. */
+
+static unsigned long sum;
+static void *stack_base;
+
+/* A simple substitute for what Emacs actually does. */
+static void
+mark_maybe_pointer (void *p)
+{
+ sum ^= (unsigned long) p;
+}
+
+static inline void __attribute__ ((no_sanitize_address))
+mark_memory (void **start, void **end)
+{
+ void **pp;
+
+ if (end < start)
+{
+ void **tem = start;
+ start = end;
+ end = tem;
+}
+
+ for (pp = start; pp < end; pp++)
+{
+ /* This is the dereference that we don't want sanitized. */
+ void *p = *pp;
+
+ mark_maybe_pointer (p);
+}
+}
+
+static void
+mark_stack (void)
+{
+ void *end;
+ mark_memory (stack_base, &end);
+}
+
+void
+garbage_collect (void)
+{
+ mark_stack ();
+}
+
+int
+main (void)
+{
+ void *dummy;
+ stack_base = &dummy;
+ garbage_collect ();
+ return 0;
+}
