1//===-- sanitizer_asm.h -----------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Various support for assemebler.
11//
12//===----------------------------------------------------------------------===//
13
14// Some toolchains do not support .cfi asm directives, so we have to hide
15// them inside macros.
16#if defined(__clang__) ||                                                      \
17    (defined(__GNUC__) && defined(__GCC_HAVE_DWARF2_CFI_ASM))
18  // GCC defined __GCC_HAVE_DWARF2_CFI_ASM if it supports CFI.
19  // Clang seems to support CFI by default (or not?).
20  // We need two versions of macros: for inline asm and standalone asm files.
21# define CFI_INL_ADJUST_CFA_OFFSET(n) ".cfi_adjust_cfa_offset " #n ";"
22
23# define CFI_STARTPROC .cfi_startproc
24# define CFI_ENDPROC .cfi_endproc
25# define CFI_ADJUST_CFA_OFFSET(n) .cfi_adjust_cfa_offset n
26# define CFI_DEF_CFA_OFFSET(n) .cfi_def_cfa_offset n
27# define CFI_REL_OFFSET(reg, n) .cfi_rel_offset reg, n
28# define CFI_OFFSET(reg, n) .cfi_offset reg, n
29# define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
30# define CFI_DEF_CFA(reg, n) .cfi_def_cfa reg, n
31# define CFI_RESTORE(reg) .cfi_restore reg
32
33#else  // No CFI
34# define CFI_INL_ADJUST_CFA_OFFSET(n)
35# define CFI_STARTPROC
36# define CFI_ENDPROC
37# define CFI_ADJUST_CFA_OFFSET(n)
38# define CFI_DEF_CFA_OFFSET(n)
39# define CFI_REL_OFFSET(reg, n)
40# define CFI_OFFSET(reg, n)
41# define CFI_DEF_CFA_REGISTER(reg)
42# define CFI_DEF_CFA(reg, n)
43# define CFI_RESTORE(reg)
44#endif
45
46#if !defined(__APPLE__)
47# define ASM_HIDDEN(symbol) .hidden symbol
48# define ASM_TYPE_FUNCTION(symbol) .type symbol, @function
49# define ASM_SIZE(symbol) .size symbol, .-symbol
50# define ASM_TSAN_SYMBOL(symbol) symbol
51# define ASM_TSAN_SYMBOL_INTERCEPTOR(symbol) symbol
52#else
53# define ASM_HIDDEN(symbol)
54# define ASM_TYPE_FUNCTION(symbol)
55# define ASM_SIZE(symbol)
56# define ASM_TSAN_SYMBOL(symbol) _##symbol
57# define ASM_TSAN_SYMBOL_INTERCEPTOR(symbol) _wrap_##symbol
58#endif
59