[sanitizer] support toolchains that don't understand CFI directives

Summary: Support toolchains that don't understand CFI directives.

Reviewers: dvyukov

Reviewed By: dvyukov

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2336

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@196480 91177308-0d34-0410-b5e6-96231b3b80d8

Author: kcc

lib/sanitizer_common/sanitizer_asm.h

@@ -0,0 +1,40 @@
+//===-- sanitizer_asm.h -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Various support for assemebler.
+//
+//===----------------------------------------------------------------------===//
+
+// Some toolchains do not support .cfi asm directives, so we have to hide
+// them inside macros.
+#if defined(__clang__) ||                                                      \
+    (defined(__GNUC__) && defined(__GCC_HAVE_DWARF2_CFI_ASM))
+  // GCC defined __GCC_HAVE_DWARF2_CFI_ASM if it supports CFI.
+  // Clang seems to support CFI by default (or not?).
+  // We need two versions of macros: for inline asm and standalone asm files.
+# define CFI_INL_ADJUST_CFA_OFFSET(n) ".cfi_adjust_cfa_offset " #n ";"
+
+# define CFI_STARTPROC .cfi_startproc
+# define CFI_ENDPROC .cfi_endproc
+# define CFI_ADJUST_CFA_OFFSET(n) .cfi_adjust_cfa_offset n
+# define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n
+# define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
+# define CFI_RESTORE(reg) .cfi_restore reg
+
+#else  // No CFI
+# define CFI_INL_ADJUST_CFA_OFFSET(n)
+# define CFI_STARTPROC
+# define CFI_ENDPROC
+# define CFI_ADJUST_CFA_OFFSET(n)
+# define CFI_REL_OFFSET(reg, n)
+# define CFI_DEF_CFA_REGISTER(reg)
+# define CFI_RESTORE(reg)
+#endif
+
+

lib/tsan/rtl/tsan_rtl.h

@@ -28,6 +28,7 @@
 
 #include "sanitizer_common/sanitizer_allocator.h"
 #include "sanitizer_common/sanitizer_allocator_internal.h"
+#include "sanitizer_common/sanitizer_asm.h"
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_libignore.h"
 #include "sanitizer_common/sanitizer_suppressions.h"
@@ -736,11 +737,11 @@ void AcquireReleaseImpl(ThreadState *thr, uptr pc, SyncClock *c);
 // so we create a reserve stack frame for it (1024b must be enough).
 #define HACKY_CALL(f) \
   __asm__ __volatile__("sub $1024, %%rsp;" \
-                       ".cfi_adjust_cfa_offset 1024;" \
+                       CFI_INL_ADJUST_CFA_OFFSET(1024) \
                        ".hidden " #f "_thunk;" \
                        "call " #f "_thunk;" \
                        "add $1024, %%rsp;" \
-                       ".cfi_adjust_cfa_offset -1024;" \
+                       CFI_INL_ADJUST_CFA_OFFSET(-1024) \
                        ::: "memory", "cc");
 #else
 #define HACKY_CALL(f) f()