[libunwind] Clean up macro usage.

[rs]

Summary

Convention in libunwind is to use !defined(FOO) not !FOO.

[EricWF]

LGTM minus the suggested cleanup.

include/__libunwind_config.h

15 ↗

(On Diff #92140)

This should have an empty definition to avoid people depending on the value 1.

20 ↗

(On Diff #92140)

This should have an empty definition to avoid people depending on the value 1.

src/config.h

35 ↗

(On Diff #92140)

This should have an empty definition to avoid people depending on the value 1.

52 ↗

(On Diff #92140)

This should have an empty definition to avoid people depending on the value 1.

56 ↗

(On Diff #92140)

This should have an empty definition to avoid people depending on the value 1.

64 ↗

(On Diff #92140)

This should have an empty definition to avoid people depending on the value 1.

libunwind/trunk/include/__libunwind_config.h

 //===------------------------- __libunwind_config.h -----------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef ____LIBUNWIND_CONFIG_H__
 #define ____LIBUNWIND_CONFIG_H__
 
 #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \
     !defined(__ARM_DWARF_EH__)
-#define _LIBUNWIND_ARM_EHABI 1
-#else
-#define _LIBUNWIND_ARM_EHABI 0
+#define _LIBUNWIND_ARM_EHABI
 #endif
 
 #if defined(_LIBUNWIND_IS_NATIVE_ONLY)
 # if defined(__i386__)
-#  define _LIBUNWIND_TARGET_I386 1
+#  define _LIBUNWIND_TARGET_I386
 #  define _LIBUNWIND_CONTEXT_SIZE 8
 #  define _LIBUNWIND_CURSOR_SIZE 19
 #  define _LIBUNWIND_HIGHEST_DWARF_REGISTER 9
 # elif defined(__x86_64__)
 #  define _LIBUNWIND_TARGET_X86_64 1
 #  define _LIBUNWIND_CONTEXT_SIZE 21
 #  define _LIBUNWIND_CURSOR_SIZE 33
 #  define _LIBUNWIND_HIGHEST_DWARF_REGISTER 17

 #  define _LIBUNWIND_TARGET_OR1K 1
 #  define _LIBUNWIND_CONTEXT_SIZE 16
 #  define _LIBUNWIND_CURSOR_SIZE 28
 #  define _LIBUNWIND_HIGHEST_DWARF_REGISTER 32
 # else
 #  error "Unsupported architecture."
 # endif
 #else // !_LIBUNWIND_IS_NATIVE_ONLY
-# define _LIBUNWIND_TARGET_I386 1
+# define _LIBUNWIND_TARGET_I386
 # define _LIBUNWIND_TARGET_X86_64 1
 # define _LIBUNWIND_TARGET_PPC 1
 # define _LIBUNWIND_TARGET_AARCH64 1
 # define _LIBUNWIND_TARGET_ARM 1
 # define _LIBUNWIND_TARGET_OR1K 1
 # define _LIBUNWIND_CONTEXT_SIZE 128
 # define _LIBUNWIND_CURSOR_SIZE 140
 # define _LIBUNWIND_HIGHEST_DWARF_REGISTER 120
 #endif // _LIBUNWIND_IS_NATIVE_ONLY
 
 #endif // ____LIBUNWIND_CONFIG_H__

libunwind/trunk/include/libunwind.h

 struct unw_cursor_t {
   uint64_t data[_LIBUNWIND_CURSOR_SIZE];
 };
 typedef struct unw_cursor_t unw_cursor_t;
 
 typedef struct unw_addr_space *unw_addr_space_t;
 
 typedef int unw_regnum_t;
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
 typedef uint32_t unw_word_t;
 typedef uint64_t unw_fpreg_t;
 #else
 typedef uint64_t unw_word_t;
 typedef double unw_fpreg_t;
 #endif
 
 struct unw_proc_info_t {

libunwind/trunk/include/unwind.h

typedef enum {
   _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
   _URC_FATAL_PHASE2_ERROR = 2,
   _URC_FATAL_PHASE1_ERROR = 3,
   _URC_NORMAL_STOP = 4,
   _URC_END_OF_STACK = 5,
   _URC_HANDLER_FOUND = 6,
   _URC_INSTALL_CONTEXT = 7,
   _URC_CONTINUE_UNWIND = 8,
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   _URC_FAILURE = 9
 #endif
 } _Unwind_Reason_Code;
 
 typedef enum {
   _UA_SEARCH_PHASE = 1,
   _UA_CLEANUP_PHASE = 2,
   _UA_HANDLER_FRAME = 4,
   _UA_FORCE_UNWIND = 8,
   _UA_END_OF_STACK = 16 // gcc extension to C++ ABI
 } _Unwind_Action;
 
 typedef struct _Unwind_Context _Unwind_Context;   // opaque
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
 typedef uint32_t _Unwind_State;
 
 static const _Unwind_State _US_VIRTUAL_UNWIND_FRAME   = 0;
 static const _Unwind_State _US_UNWIND_FRAME_STARTING  = 1;
 static const _Unwind_State _US_UNWIND_FRAME_RESUME    = 2;
 static const _Unwind_State _US_ACTION_MASK            = 3;
 /* Undocumented flag for force unwinding. */
 static const _Unwind_State _US_FORCE_UNWIND           = 8;

 extern void _Unwind_SjLj_Resume(_Unwind_Exception *exception_object);
 #else
 extern _Unwind_Reason_Code
     _Unwind_RaiseException(_Unwind_Exception *exception_object);
 extern void _Unwind_Resume(_Unwind_Exception *exception_object);
 #endif
 extern void _Unwind_DeleteException(_Unwind_Exception *exception_object);
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
 typedef enum {
   _UVRSC_CORE = 0, /* integer register */
   _UVRSC_VFP = 1, /* vfp */
   _UVRSC_WMMXD = 3, /* Intel WMMX data register */
   _UVRSC_WMMXC = 4 /* Intel WMMX control register */
 } _Unwind_VRS_RegClass;
 
 typedef enum {
_Unwind_VRS_Set(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
                 void *valuep);
 
 extern _Unwind_VRS_Result
 _Unwind_VRS_Pop(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
                 uint32_t discriminator,
                 _Unwind_VRS_DataRepresentation representation);
 #endif
 
-#if !_LIBUNWIND_ARM_EHABI
+#if !defined(_LIBUNWIND_ARM_EHABI)
 
 extern uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, int index);
 extern void _Unwind_SetGR(struct _Unwind_Context *context, int index,
                           uintptr_t new_value);
 extern uintptr_t _Unwind_GetIP(struct _Unwind_Context *context);
 extern void _Unwind_SetIP(struct _Unwind_Context *, uintptr_t new_value);
 
-#else  // _LIBUNWIND_ARM_EHABI
+#else  // defined(_LIBUNWIND_ARM_EHABI)
 
 #if defined(_LIBUNWIND_UNWIND_LEVEL1_EXTERNAL_LINKAGE)
 #define _LIBUNWIND_EXPORT_UNWIND_LEVEL1 extern
 #else
 #define _LIBUNWIND_EXPORT_UNWIND_LEVEL1 static __inline__
 #endif
 
 // These are de facto helper functions for ARM, which delegate the function
uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
   return _Unwind_GetGR(context, 15) & (~(uintptr_t)0x1);
 }
 
 _LIBUNWIND_EXPORT_UNWIND_LEVEL1
 void _Unwind_SetIP(struct _Unwind_Context *context, uintptr_t value) {
   uintptr_t thumb_bit = _Unwind_GetGR(context, 15) & ((uintptr_t)0x1);
   _Unwind_SetGR(context, 15, value | thumb_bit);
 }
-#endif  // _LIBUNWIND_ARM_EHABI
+#endif  // defined(_LIBUNWIND_ARM_EHABI)
 
 extern uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context *context);
 extern uintptr_t
     _Unwind_GetLanguageSpecificData(struct _Unwind_Context *context);
 #ifdef __USING_SJLJ_EXCEPTIONS__
 extern _Unwind_Reason_Code
     _Unwind_SjLj_ForcedUnwind(_Unwind_Exception *exception_object,
                               _Unwind_Stop_Fn stop, void *stop_parameter);

libunwind/trunk/src/AddressSpace.hpp

 #include "dwarf2.h"
 #include "EHHeaderParser.hpp"
 #include "Registers.hpp"
 
 namespace libunwind {
 
 /// Used by findUnwindSections() to return info about needed sections.
 struct UnwindInfoSections {
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND || _LIBUNWIND_SUPPORT_DWARF_INDEX ||       \
-    _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) || defined(_LIBUNWIND_SUPPORT_DWARF_INDEX) ||       \
+    defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
   // No dso_base for ARM EHABI.
   uintptr_t       dso_base;
 #endif
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
   uintptr_t       dwarf_section;
   uintptr_t       dwarf_section_length;
 #endif
-#if _LIBUNWIND_SUPPORT_DWARF_INDEX
+#if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
   uintptr_t       dwarf_index_section;
   uintptr_t       dwarf_index_section_length;
 #endif
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
   uintptr_t       compact_unwind_section;
   uintptr_t       compact_unwind_section_length;
 #endif
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   uintptr_t       arm_section;
   uintptr_t       arm_section_length;
 #endif
 };
 
 
 /// LocalAddressSpace is used as a template parameter to UnwindCursor when
 /// unwinding a thread in the same process.  The wrappers compile away,
#endif
       if (!info->compact_unwind_section) {
         info->compact_unwind_section_length = 0;
       }
 
       return true;
     }
   #endif
 
-#elif _LIBUNWIND_ARM_EHABI && defined(_LIBUNWIND_IS_BAREMETAL)
+#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
 
 // When statically linked on bare-metal, the symbols for the EH table are looked
 // up without going through the dynamic loader.
 extern char __exidx_start;
 extern char __exidx_end;
 
-#elif _LIBUNWIND_ARM_EHABI || _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#elif defined(_LIBUNWIND_ARM_EHABI) || defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
 // ELF-based systems may use dl_iterate_phdr() to access sections
 // containing unwinding information. The ElfW() macro for pointer-size
 // independent ELF header traversal is not provided by <link.h> on some
 // systems (e.g., FreeBSD). On these systems the data structures are
 // just called Elf_XXX. Define ElfW() locally.
 #include <link.h>
 #if !defined(ElfW)
 #define ElfW(type) Elf_##type
 #endif
 
 #endif
 
 inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
                                                   UnwindInfoSections &info) {
 #ifdef __APPLE__
   dyld_unwind_sections dyldInfo;
   if (_dyld_find_unwind_sections((void *)targetAddr, &dyldInfo)) {
     info.dso_base                      = (uintptr_t)dyldInfo.mh;
- #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+ #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
     info.dwarf_section                 = (uintptr_t)dyldInfo.dwarf_section;
     info.dwarf_section_length          = dyldInfo.dwarf_section_length;
  #endif
     info.compact_unwind_section        = (uintptr_t)dyldInfo.compact_unwind_section;
     info.compact_unwind_section_length = dyldInfo.compact_unwind_section_length;
     return true;
   }
-#elif _LIBUNWIND_ARM_EHABI && defined(_LIBUNWIND_IS_BAREMETAL)
+#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
   // Bare metal is statically linked, so no need to ask the dynamic loader
   info.arm_section =        (uintptr_t)(&__exidx_start);
   info.arm_section_length = (uintptr_t)(&__exidx_end - &__exidx_start);
   _LIBUNWIND_TRACE_UNWINDING("findUnwindSections: section %X length %x",
                              info.arm_section, info.arm_section_length);
   if (info.arm_section && info.arm_section_length)
     return true;
-#elif _LIBUNWIND_ARM_EHABI || _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#elif defined(_LIBUNWIND_ARM_EHABI) || defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
   struct dl_iterate_cb_data {
     LocalAddressSpace *addressSpace;
     UnwindInfoSections *sects;
     uintptr_t targetAddr;
   };
 
   dl_iterate_cb_data cb_data = {this, &info, targetAddr};
   int found = dl_iterate_phdr(

 
 #if !defined(Elf_Half)
         typedef ElfW(Half) Elf_Half;
 #endif
 #if !defined(Elf_Phdr)
         typedef ElfW(Phdr) Elf_Phdr;
 #endif
 
- #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
-  #if !_LIBUNWIND_SUPPORT_DWARF_INDEX
+ #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
+  #if !defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
    #error "_LIBUNWIND_SUPPORT_DWARF_UNWIND requires _LIBUNWIND_SUPPORT_DWARF_INDEX on this platform."
   #endif
         size_t object_length;
         for (Elf_Half i = 0; i < pinfo->dlpi_phnum; i++) {
           const Elf_Phdr *phdr = &pinfo->dlpi_phdr[i];
           if (phdr->p_type == PT_LOAD) {
             uintptr_t begin = pinfo->dlpi_addr + phdr->p_vaddr;
             uintptr_t end = begin + phdr->p_memsz;
#endif
         }
 
         if (found_obj && found_hdr) {
           cbdata->sects->dwarf_section_length = object_length;
           return true;
         } else {
           return false;
         }
- #else // _LIBUNWIND_ARM_EHABI
+ #else // defined(_LIBUNWIND_ARM_EHABI)
         for (Elf_Half i = 0; i < pinfo->dlpi_phnum; i++) {
           const Elf_Phdr *phdr = &pinfo->dlpi_phdr[i];
           if (phdr->p_type == PT_LOAD) {
             uintptr_t begin = pinfo->dlpi_addr + phdr->p_vaddr;
             uintptr_t end = begin + phdr->p_memsz;
             if (cbdata->targetAddr >= begin && cbdata->targetAddr < end)
               found_obj = true;
           } else if (phdr->p_type == PT_ARM_EXIDX) {

libunwind/trunk/src/Unwind-EHABI.h

 //===------------------------- Unwind-EHABI.hpp ---------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef __UNWIND_EHABI_H__
 #define __UNWIND_EHABI_H__
 
 #include <__libunwind_config.h>
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
 
 #include <stdint.h>
 #include <unwind.h>
 
 // Unable to unwind in the ARM index table (section 5 EHABI).
 #define UNW_EXIDX_CANTUNWIND 0x1
 
 static inline uint32_t signExtendPrel31(uint32_t data) {

 
 extern _Unwind_Reason_Code __aeabi_unwind_cpp_pr2(
     _Unwind_State state, _Unwind_Control_Block *ucbp, _Unwind_Context *context);
 
 #if defined(__cplusplus)
 } // extern "C"
 #endif
 
-#endif // _LIBUNWIND_ARM_EHABI
+#endif // defined(_LIBUNWIND_ARM_EHABI)
 
 #endif  // __UNWIND_EHABI_H__

libunwind/trunk/src/Unwind-EHABI.cpp

 //===--------------------------- Unwind-EHABI.cpp -------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //
 //  Implements ARM zero-cost C++ exceptions
 //
 //===----------------------------------------------------------------------===//
 
 #include "Unwind-EHABI.h"
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
 
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <type_traits>

 __gnu_unwind_frame(_Unwind_Exception *exception_object,
                    struct _Unwind_Context *context) {
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   if (unw_step(cursor) != UNW_STEP_SUCCESS)
     return _URC_FAILURE;
   return _URC_OK;
 }
 
-#endif  // _LIBUNWIND_ARM_EHABI
+#endif  // defined(_LIBUNWIND_ARM_EHABI)

libunwind/trunk/src/Unwind-sjlj.c

 // do any clean up when an exception propagates through it, needs to call 
 // _Unwind_SjLj_Register() at the start of the function and 
 // _Unwind_SjLj_Unregister() at the end.  The register function is called with 
 // the address of a block of memory in the function's stack frame.  The runtime
 // keeps a linked list (stack) of these blocks - one per thread.  The calling 
 // function also sets the personality and lsda fields of the block.
 //
 
-#if _LIBUNWIND_BUILD_SJLJ_APIS
+#if defined(_LIBUNWIND_BUILD_SJLJ_APIS)
 
 struct _Unwind_FunctionContext {
   // next function in stack of handlers
   struct _Unwind_FunctionContext *prev;
 
   // set by calling function before registering to be the landing pad
   uintptr_t                       resumeLocation;
 
if (context != NULL) {
     _Unwind_FunctionContext_t ufc = (_Unwind_FunctionContext_t) context;
     // Setjmp/longjmp based exceptions don't have a true CFA.
     // Instead, the SP in the jmpbuf is the closest approximation.
     return (uintptr_t) ufc->jbuf[2];
   }
   return 0;
 }
 
-#endif // _LIBUNWIND_BUILD_SJLJ_APIS
+#endif // defined(_LIBUNWIND_BUILD_SJLJ_APIS)

libunwind/trunk/src/UnwindCursor.hpp

 #include "DwarfInstructions.hpp"
 #include "EHHeaderParser.hpp"
 #include "libunwind.h"
 #include "Registers.hpp"
 #include "Unwind-EHABI.h"
 
 namespace libunwind {
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 /// Cache of recently found FDEs.
 template <typename A>
 class _LIBUNWIND_HIDDEN DwarfFDECache {
   typedef typename A::pint_t pint_t;
 public:
   static pint_t findFDE(pint_t mh, pint_t pc);
   static void add(pint_t mh, pint_t ip_start, pint_t ip_end, pint_t fde);
   static void removeAllIn(pint_t mh);

 void DwarfFDECache<A>::iterateCacheEntries(void (*func)(
     unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) {
   _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_wrlock(&_lock));
   for (entry *p = _buffer; p < _bufferUsed; ++p) {
     (*func)(p->ip_start, p->ip_end, p->fde, p->mh);
   }
   _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock));
 }
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
 
 #define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field))
 
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 template <typename A> class UnwindSectionHeader {
 public:
   UnwindSectionHeader(A &addressSpace, typename A::pint_t addr)
       : _addressSpace(addressSpace), _addr(addr) {}
 
   uint32_t version() const {
     return _addressSpace.get32(_addr +
                                offsetof(unwind_info_section_header, version));
return _addressSpace.get32(
         _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry,
                               index, lsdaOffset));
   }
 
 private:
   A                   &_addressSpace;
   typename A::pint_t   _addr;
 };
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 
 class _LIBUNWIND_HIDDEN AbstractUnwindCursor {
 public:
   // NOTE: provide a class specific placement deallocation function (S5.3.4 p20)
   // This avoids an unnecessary dependency to libc++abi.
   void operator delete(void *, size_t) {}
 
   virtual ~AbstractUnwindCursor() {}
public:
   virtual void        setInfoBasedOnIPRegister(bool isReturnAddress = false);
   virtual const char *getRegisterName(int num);
 #ifdef __arm__
   virtual void        saveVFPAsX();
 #endif
 
 private:
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   bool getInfoFromEHABISection(pint_t pc, const UnwindInfoSections &sects);
 
   int stepWithEHABI() {
     size_t len = 0;
     size_t off = 0;
     // FIXME: Calling decode_eht_entry() here is violating the libunwind
     // abstraction layer.
     const uint32_t *ehtp =
         decode_eht_entry(reinterpret_cast<const uint32_t *>(_info.unwind_info),
                          &off, &len);
     if (_Unwind_VRS_Interpret((_Unwind_Context *)this, ehtp, off, len) !=
             _URC_CONTINUE_UNWIND)
       return UNW_STEP_END;
     return UNW_STEP_SUCCESS;
   }
 #endif
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
   bool getInfoFromDwarfSection(pint_t pc, const UnwindInfoSections &sects,
                                             uint32_t fdeSectionOffsetHint=0);
   int stepWithDwarfFDE() {
     return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace,
                                               (pint_t)this->getReg(UNW_REG_IP),
                                               (pint_t)_info.unwind_info,
                                               _registers);
   }
 #endif
 
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
   bool getInfoFromCompactEncodingSection(pint_t pc,
                                             const UnwindInfoSections &sects);
   int stepWithCompactEncoding() {
-  #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+  #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
     if ( compactSaysUseDwarf() )
       return stepWithDwarfFDE();
   #endif
     R dummy;
     return stepWithCompactEncoding(dummy);
   }
 
 #if defined(_LIBUNWIND_TARGET_X86_64)
bool compactSaysUseDwarf(Registers_arm64 &, uint32_t *offset) const {
     if ((_info.format & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_DWARF) {
       if (offset)
         *offset = (_info.format & UNWIND_ARM64_DWARF_SECTION_OFFSET);
       return true;
     }
     return false;
   }
 #endif
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
   compact_unwind_encoding_t dwarfEncoding() const {
     R dummy;
     return dwarfEncoding(dummy);
   }
 
 #if defined(_LIBUNWIND_TARGET_X86_64)
   compact_unwind_encoding_t dwarfEncoding(Registers_x86_64 &) const {
     return UNWIND_X86_64_MODE_DWARF;
#if defined(_LIBUNWIND_TARGET_AARCH64)
   }
 #endif
 
 #if defined (_LIBUNWIND_TARGET_OR1K)
   compact_unwind_encoding_t dwarfEncoding(Registers_or1k &) const {
     return 0;
   }
 #endif
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
 
   A               &_addressSpace;
   R                _registers;
   unw_proc_info_t  _info;
   bool             _unwindInfoMissing;
   bool             _isSignalFrame;
 };

 const char *UnwindCursor<A, R>::getRegisterName(int regNum) {
   return _registers.getRegisterName(regNum);
 }
 
 template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() {
   return _isSignalFrame;
 }
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
 struct EHABIIndexEntry {
   uint32_t functionOffset;
   uint32_t data;
 };
 
 template<typename A>
 struct EHABISectionIterator {
   typedef EHABISectionIterator _Self;
bool UnwindCursor<A, R>::getInfoFromEHABISection(
   _info.lsda = lsda;
   // flags is pr_cache.additional. See EHABI #7.2 for definition of bit 0.
   _info.flags = isSingleWordEHT ? 1 : 0 | scope32 ? 0x2 : 0;  // Use enum?
 
   return true;
 }
 #endif
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 template <typename A, typename R>
 bool UnwindCursor<A, R>::getInfoFromDwarfSection(pint_t pc,
                                                 const UnwindInfoSections &sects,
                                                 uint32_t fdeSectionOffsetHint) {
   typename CFI_Parser<A>::FDE_Info fdeInfo;
   typename CFI_Parser<A>::CIE_Info cieInfo;
   bool foundFDE = false;
   bool foundInCache = false;
   // If compact encoding table gave offset into dwarf section, go directly there
   if (fdeSectionOffsetHint != 0) {
     foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section,
                                     (uint32_t)sects.dwarf_section_length,
                                     sects.dwarf_section + fdeSectionOffsetHint,
                                     &fdeInfo, &cieInfo);
   }
-#if _LIBUNWIND_SUPPORT_DWARF_INDEX
+#if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
   if (!foundFDE && (sects.dwarf_index_section != 0)) {
     foundFDE = EHHeaderParser<A>::findFDE(
         _addressSpace, pc, sects.dwarf_index_section,
         (uint32_t)sects.dwarf_index_section_length, &fdeInfo, &cieInfo);
   }
 #endif
   if (!foundFDE) {
     // otherwise, search cache of previously found FDEs.
if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, pc,
       _info.format            = dwarfEncoding();
       _info.unwind_info       = fdeInfo.fdeStart;
       _info.unwind_info_size  = (uint32_t)fdeInfo.fdeLength;
       _info.extra             = (unw_word_t) sects.dso_base;
 
       // Add to cache (to make next lookup faster) if we had no hint
       // and there was no index.
       if (!foundInCache && (fdeSectionOffsetHint == 0)) {
-  #if _LIBUNWIND_SUPPORT_DWARF_INDEX
+  #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
         if (sects.dwarf_index_section == 0)
   #endif
         DwarfFDECache<A>::add(sects.dso_base, fdeInfo.pcStart, fdeInfo.pcEnd,
                               fdeInfo.fdeStart);
       }
       return true;
     }
   }
   //_LIBUNWIND_DEBUG_LOG("can't find/use FDE for pc=0x%llX", (uint64_t)pc);
   return false;
 }
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
 
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 template <typename A, typename R>
 bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(pint_t pc,
                                               const UnwindInfoSections &sects) {
   const bool log = false;
   if (log)
     fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX, mh=0x%llX)\n",
             (uint64_t)pc, (uint64_t)sects.dso_base);
 
bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(pint_t pc,
   _info.gp = 0;
   _info.flags = 0;
   _info.format = encoding;
   _info.unwind_info = 0;
   _info.unwind_info_size = 0;
   _info.extra = sects.dso_base;
   return true;
 }
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 
 
 template <typename A, typename R>
 void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
   pint_t pc = (pint_t)this->getReg(UNW_REG_IP);
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   // Remove the thumb bit so the IP represents the actual instruction address.
   // This matches the behaviour of _Unwind_GetIP on arm.
   pc &= (pint_t)~0x1;
 #endif
 
   // If the last line of a function is a "throw" the compiler sometimes
   // emits no instructions after the call to __cxa_throw.  This means
   // the return address is actually the start of the next function.
   // To disambiguate this, back up the pc when we know it is a return
   // address.
   if (isReturnAddress)
     --pc;
 
   // Ask address space object to find unwind sections for this pc.
   UnwindInfoSections sects;
   if (_addressSpace.findUnwindSections(pc, sects)) {
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
     // If there is a compact unwind encoding table, look there first.
     if (sects.compact_unwind_section != 0) {
       if (this->getInfoFromCompactEncodingSection(pc, sects)) {
-  #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+  #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
         // Found info in table, done unless encoding says to use dwarf.
         uint32_t dwarfOffset;
         if ((sects.dwarf_section != 0) && compactSaysUseDwarf(&dwarfOffset)) {
           if (this->getInfoFromDwarfSection(pc, sects, dwarfOffset)) {
             // found info in dwarf, done
             return;
           }
         }
   #endif
         // If unwind table has entry, but entry says there is no unwind info,
         // record that we have no unwind info.
         if (_info.format == 0)
           _unwindInfoMissing = true;
         return;
       }
     }
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
     // If there is dwarf unwind info, look there next.
     if (sects.dwarf_section != 0) {
       if (this->getInfoFromDwarfSection(pc, sects)) {
         // found info in dwarf, done
         return;
       }
     }
 #endif
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
     // If there is ARM EHABI unwind info, look there next.
     if (sects.arm_section != 0 && this->getInfoFromEHABISection(pc, sects))
       return;
 #endif
   }
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
   // There is no static unwind info for this pc. Look to see if an FDE was
   // dynamically registered for it.
   pint_t cachedFDE = DwarfFDECache<A>::findFDE(0, pc);
   if (cachedFDE != 0) {
     CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
     CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
     const char *msg = CFI_Parser<A>::decodeFDE(_addressSpace,
                                                 cachedFDE, &fdeInfo, &cieInfo);
if (!CFI_Parser<A>::decodeFDE(_addressSpace, fde, &fdeInfo, &cieInfo)) {
           _info.unwind_info      = fdeInfo.fdeStart;
           _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
           _info.extra            = 0;
           return;
         }
       }
     }
   }
-#endif // #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#endif // #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
   // no unwind info, flag that we can't reliably unwind
   _unwindInfoMissing = true;
 }
 
 template <typename A, typename R>
 int UnwindCursor<A, R>::step() {
   // Bottom of stack is defined is when unwind info cannot be found.
   if (_unwindInfoMissing)
     return UNW_STEP_END;
 
   // Use unwinding info to modify register set as if function returned.
   int result;
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
   result = this->stepWithCompactEncoding();
-#elif _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
   result = this->stepWithDwarfFDE();
-#elif _LIBUNWIND_ARM_EHABI
+#elif defined(_LIBUNWIND_ARM_EHABI)
   result = this->stepWithEHABI();
 #else
   #error Need _LIBUNWIND_SUPPORT_COMPACT_UNWIND or \
               _LIBUNWIND_SUPPORT_DWARF_UNWIND or \
               _LIBUNWIND_ARM_EHABI
 #endif
 
   // update info based on new PC

libunwind/trunk/src/UnwindLevel1-gcc-ext.c

 #include <string.h>
 
 #include "config.h"
 #include "libunwind_ext.h"
 #include "libunwind.h"
 #include "Unwind-EHABI.h"
 #include "unwind.h"
 
-#if _LIBUNWIND_BUILD_ZERO_COST_APIS
+#if defined(_LIBUNWIND_BUILD_ZERO_COST_APIS)
 
 ///  Called by __cxa_rethrow().
 _LIBUNWIND_EXPORT _Unwind_Reason_Code
 _Unwind_Resume_or_Rethrow(_Unwind_Exception *exception_object) {
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   _LIBUNWIND_TRACE_API("_Unwind_Resume_or_Rethrow(ex_obj=%p), private_1=%ld",
                        (void *)exception_object,
                        (long)exception_object->unwinder_cache.reserved1);
 #else
   _LIBUNWIND_TRACE_API("_Unwind_Resume_or_Rethrow(ex_obj=%p), private_1=%ld",
                        (void *)exception_object,
                        (long)exception_object->private_1);
 #endif
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   // _Unwind_RaiseException on EHABI will always set the reserved1 field to 0,
   // which is in the same position as private_1 below.
   return _Unwind_RaiseException(exception_object);
 #else
   // If this is non-forced and a stopping place was found, then this is a
   // re-throw.
   // Call _Unwind_RaiseException() as if this was a new exception
   if (exception_object->private_1 == 0) {
_Unwind_Backtrace(_Unwind_Trace_Fn callback, void *ref) {
   unw_cursor_t cursor;
   unw_context_t uc;
   unw_getcontext(&uc);
   unw_init_local(&cursor, &uc);
 
   _LIBUNWIND_TRACE_API("_Unwind_Backtrace(callback=%p)",
                        (void *)(uintptr_t)callback);
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   // Create a mock exception object for force unwinding.
   _Unwind_Exception ex;
   memset(&ex, '\0', sizeof(ex));
   ex.exception_class = 0x434C4E47554E5700; // CLNGUNW\0
 #endif
 
   // walk each frame
   while (true) {
     _Unwind_Reason_Code result;
 
-#if !_LIBUNWIND_ARM_EHABI
+#if !defined(_LIBUNWIND_ARM_EHABI)
     // ask libunwind to get next frame (skip over first frame which is
     // _Unwind_Backtrace())
     if (unw_step(&cursor) <= 0) {
       _LIBUNWIND_TRACE_UNWINDING(" _backtrace: ended because cursor reached "
                                  "bottom of stack, returning %d",
                                  _URC_END_OF_STACK);
       return _URC_END_OF_STACK;
     }
#else
     __personality_routine handler = (__personality_routine) frameInfo.handler;
     if (handler == NULL) {
       return _URC_END_OF_STACK;
     }
     if (handler(_US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND, &ex, context) !=
             _URC_CONTINUE_UNWIND) {
       return _URC_END_OF_STACK;
     }
-#endif // _LIBUNWIND_ARM_EHABI
+#endif // defined(_LIBUNWIND_ARM_EHABI)
 
     // debugging
     if (_LIBUNWIND_TRACING_UNWINDING) {
       char functionName[512];
       unw_proc_info_t frame;
       unw_word_t offset;
       unw_get_proc_name(&cursor, functionName, 512, &offset);
       unw_get_proc_info(&cursor, &frame);

 /// site address.  Normally IP is the return address.
 _LIBUNWIND_EXPORT uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context,
                                               int *ipBefore) {
   _LIBUNWIND_TRACE_API("_Unwind_GetIPInfo(context=%p)", (void *)context);
   *ipBefore = 0;
   return _Unwind_GetIP(context);
 }
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
 /// Called by programs with dynamic code generators that want
 /// to register a dynamically generated FDE.
 /// This function has existed on Mac OS X since 10.4, but
 /// was broken until 10.6.
 _LIBUNWIND_EXPORT void __register_frame(const void *fde) {
   _LIBUNWIND_TRACE_API("__register_frame(%p)", fde);
   _unw_add_dynamic_fde((unw_word_t)(uintptr_t) fde);

 // The following register/deregister functions are gcc extensions.
 // They have existed on Mac OS X, but have never worked because Mac OS X
 // before 10.6 used keymgr to track known FDEs, but these functions
 // never got updated to use keymgr.
 // For now, we implement these as do-nothing functions to keep any existing
 // applications working.  We also add the not in 10.6 symbol so that nwe
 // application won't be able to use them.
 
-#if _LIBUNWIND_SUPPORT_FRAME_APIS
+#if defined(_LIBUNWIND_SUPPORT_FRAME_APIS)
 _LIBUNWIND_EXPORT void __register_frame_info_bases(const void *fde, void *ob,
                                                    void *tb, void *db) {
   (void)fde;
   (void)ob;
   (void)tb;
   (void)db;
  _LIBUNWIND_TRACE_API("__register_frame_info_bases(%p,%p, %p, %p)",
                             fde, ob, tb, db);

 }
 
 _LIBUNWIND_EXPORT void *__deregister_frame_info_bases(const void *fde) {
   (void)fde;
   _LIBUNWIND_TRACE_API("__deregister_frame_info_bases(%p)", fde);
   // do nothing, this function never worked in Mac OS X
   return NULL;
 }
-#endif // _LIBUNWIND_SUPPORT_FRAME_APIS
+#endif // defined(_LIBUNWIND_SUPPORT_FRAME_APIS)
 
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
-#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS
+#endif // defined(_LIBUNWIND_BUILD_ZERO_COST_APIS)

libunwind/trunk/src/UnwindLevel1.c

 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "libunwind.h"
 #include "unwind.h"
 #include "config.h"
 
-#if !_LIBUNWIND_ARM_EHABI
+#if !defined(_LIBUNWIND_ARM_EHABI)
 
 static _Unwind_Reason_Code
 unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *exception_object) {
   unw_init_local(cursor, uc);
 
   // Walk each frame looking for a place to stop.
   bool handlerNotFound = true;
   while (handlerNotFound) {

 _LIBUNWIND_EXPORT void _Unwind_SetIP(struct _Unwind_Context *context,
                                      uintptr_t value) {
   _LIBUNWIND_TRACE_API("_Unwind_SetIP(context=%p, value=0x%0" PRIx64 ")",
                        (void *)context, (uint64_t)value);
   unw_cursor_t *cursor = (unw_cursor_t *)context;
   unw_set_reg(cursor, UNW_REG_IP, value);
 }
 
-#endif // !_LIBUNWIND_ARM_EHABI
+#endif // !defined(_LIBUNWIND_ARM_EHABI)

libunwind/trunk/src/Unwind_AppleExtras.cpp

extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
           __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
     extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
           __attribute__((visibility("default"))) const char sym##_tmp5 = 0; \
     extern const char sym##_tmp6 __asm("$ld$hide$os10.6$_" #sym ); \
           __attribute__((visibility("default"))) const char sym##_tmp6 = 0;
 #endif
 
 
-#if _LIBUNWIND_BUILD_ZERO_COST_APIS
+#if defined(_LIBUNWIND_BUILD_ZERO_COST_APIS)
 
 //
 // symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in
 // earlier versions
 //
 NOT_HERE_BEFORE_10_6(_Unwind_DeleteException)
 NOT_HERE_BEFORE_10_6(_Unwind_Find_FDE)
 NOT_HERE_BEFORE_10_6(_Unwind_ForcedUnwind)

 NEVER_HERE(__register_frame_info_bases)
 NEVER_HERE(__register_frame_info)
 NEVER_HERE(__register_frame_info_table_bases)
 NEVER_HERE(__register_frame_info_table)
 NEVER_HERE(__register_frame_table)
 NEVER_HERE(__deregister_frame_info)
 NEVER_HERE(__deregister_frame_info_bases)
 
-#endif // _LIBUNWIND_BUILD_ZERO_COST_APIS
+#endif // defined(_LIBUNWIND_BUILD_ZERO_COST_APIS)
 
 
 
 
-#if _LIBUNWIND_BUILD_SJLJ_APIS
+#if defined(_LIBUNWIND_BUILD_SJLJ_APIS)
 //
 // symbols in libSystem.dylib in iOS 5.0 and later, but are in libgcc_s.dylib in
 // earlier versions
 //
 NOT_HERE_BEFORE_5_0(_Unwind_GetLanguageSpecificData)
 NOT_HERE_BEFORE_5_0(_Unwind_GetRegionStart)
 NOT_HERE_BEFORE_5_0(_Unwind_GetIP)
 NOT_HERE_BEFORE_5_0(_Unwind_SetGR)
 NOT_HERE_BEFORE_5_0(_Unwind_SetIP)
 NOT_HERE_BEFORE_5_0(_Unwind_DeleteException)
 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Register)
 NOT_HERE_BEFORE_5_0(_Unwind_GetGR)
 NOT_HERE_BEFORE_5_0(_Unwind_GetIPInfo)
 NOT_HERE_BEFORE_5_0(_Unwind_GetCFA)
 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume)
 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_RaiseException)
 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume_or_Rethrow)
 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Unregister)
 
-#endif // _LIBUNWIND_BUILD_SJLJ_APIS
+#endif // defined(_LIBUNWIND_BUILD_SJLJ_APIS)
 
 
 namespace libunwind {
 
 _LIBUNWIND_HIDDEN
 bool checkKeyMgrRegisteredFDEs(uintptr_t pc, void *&fde) {
 #if __MAC_OS_X_VERSION_MIN_REQUIRED
   // lastly check for old style keymgr registration of dynamically generated
#else
   (void)fde;
 #endif
   return false;
 }
 
 }
 
 
-#if !defined(FOR_DYLD) && _LIBUNWIND_BUILD_SJLJ_APIS
+#if !defined(FOR_DYLD) && defined(_LIBUNWIND_BUILD_SJLJ_APIS)
 
 #ifndef _LIBUNWIND_HAS_NO_THREADS
   #include <System/pthread_machdep.h>
 #else
   _Unwind_FunctionContext *fc_ = nullptr;
 #endif
 
 // Accessors to get get/set linked list of frames for sjlj based execeptions.

libunwind/trunk/src/config.h

#if !(__has_feature(cxx_static_assert)) && !defined(static_assert)
   #define static_assert(__b, __m) \
       extern int compile_time_assert_failed[ ( __b ) ? 1 : -1 ]  \
                                                   __attribute__( ( unused ) );
 #endif
 
 // Platform specific configuration defines.
 #ifdef __APPLE__
   #if defined(FOR_DYLD)
-    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1
-    #define _LIBUNWIND_SUPPORT_DWARF_UNWIND   0
-    #define _LIBUNWIND_SUPPORT_DWARF_INDEX    0
+    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND
   #else
-    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1
+    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND
     #define _LIBUNWIND_SUPPORT_DWARF_UNWIND   1
-    #define _LIBUNWIND_SUPPORT_DWARF_INDEX    0
   #endif
 #else
   #if defined(__ARM_DWARF_EH__) || !defined(__arm__)
-    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 0
     #define _LIBUNWIND_SUPPORT_DWARF_UNWIND 1
     #define _LIBUNWIND_SUPPORT_DWARF_INDEX 1
-  #else
-    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 0
-    #define _LIBUNWIND_SUPPORT_DWARF_UNWIND 0
-    #define _LIBUNWIND_SUPPORT_DWARF_INDEX 0
   #endif
 #endif
 
 // FIXME: these macros are not correct for COFF targets
 #define _LIBUNWIND_EXPORT __attribute__((visibility("default")))
 #define _LIBUNWIND_HIDDEN __attribute__((visibility("hidden")))
 
 #if (defined(__APPLE__) && defined(__arm__)) || defined(__USING_SJLJ_EXCEPTIONS__)
-#define _LIBUNWIND_BUILD_SJLJ_APIS 1
-#else
-#define _LIBUNWIND_BUILD_SJLJ_APIS 0
+#define _LIBUNWIND_BUILD_SJLJ_APIS
 #endif
 
 #if defined(__i386__) || defined(__x86_64__) || defined(__ppc__) || defined(__ppc64__)
-#define _LIBUNWIND_SUPPORT_FRAME_APIS 1
-#else
-#define _LIBUNWIND_SUPPORT_FRAME_APIS 0
+#define _LIBUNWIND_SUPPORT_FRAME_APIS
 #endif
 
 #if defined(__i386__) || defined(__x86_64__) ||                                \
     defined(__ppc__) || defined(__ppc64__) ||                                  \
     (!defined(__APPLE__) && defined(__arm__)) ||                               \
     (defined(__arm64__) || defined(__aarch64__)) ||                            \
     (defined(__APPLE__) && defined(__mips__))
-#define _LIBUNWIND_BUILD_ZERO_COST_APIS 1
-#else
-#define _LIBUNWIND_BUILD_ZERO_COST_APIS 0
+#define _LIBUNWIND_BUILD_ZERO_COST_APIS
 #endif
 
 #if defined(NDEBUG) && defined(_LIBUNWIND_IS_BAREMETAL)
 #define _LIBUNWIND_ABORT(msg)                                                  \
   do {                                                                         \
     abort();                                                                   \
   } while (0)
 #else

libunwind/trunk/src/libunwind.cpp

 #if defined(__i386__)
 # define REGISTER_KIND Registers_x86
 #elif defined(__x86_64__)
 # define REGISTER_KIND Registers_x86_64
 #elif defined(__ppc__)
 # define REGISTER_KIND Registers_ppc
 #elif defined(__aarch64__)
 # define REGISTER_KIND Registers_arm64
-#elif _LIBUNWIND_ARM_EHABI
+#elif defined(_LIBUNWIND_ARM_EHABI)
 # define REGISTER_KIND Registers_arm
 #elif defined(__or1k__)
 # define REGISTER_KIND Registers_or1k
 #elif defined(__mips__)
 # warning The MIPS architecture is not supported.
 #else
 # error Architecture not supported
 #endif
_LIBUNWIND_EXPORT int unw_get_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
   }
   return UNW_EBADREG;
 }
 
 
 /// Set value of specified float register at cursor position in stack frame.
 _LIBUNWIND_EXPORT int unw_set_fpreg(unw_cursor_t *cursor, unw_regnum_t regNum,
                                     unw_fpreg_t value) {
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
   _LIBUNWIND_TRACE_API("unw_set_fpreg(cursor=%p, regNum=%d, value=%llX)",
                        static_cast<void *>(cursor), regNum, value);
 #else
   _LIBUNWIND_TRACE_API("unw_set_fpreg(cursor=%p, regNum=%d, value=%g)",
                        static_cast<void *>(cursor), regNum, value);
 #endif
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   if (co->validFloatReg(regNum)) {
_LIBUNWIND_EXPORT void unw_save_vfp_as_X(unw_cursor_t *cursor) {
   _LIBUNWIND_TRACE_API("unw_fpreg_save_vfp_as_X(cursor=%p)",
                        static_cast<void *>(cursor));
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   return co->saveVFPAsX();
 }
 #endif
 
 
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 /// SPI: walks cached DWARF entries
 _LIBUNWIND_EXPORT void unw_iterate_dwarf_unwind_cache(void (*func)(
     unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) {
   _LIBUNWIND_TRACE_API("unw_iterate_dwarf_unwind_cache(func=%p)",
                        reinterpret_cast<void *>(func));
   DwarfFDECache<LocalAddressSpace>::iterateCacheEntries(func);
 }
 
void _unw_add_dynamic_fde(unw_word_t fde) {
   }
 }
 
 /// IPI: for __deregister_frame()
 void _unw_remove_dynamic_fde(unw_word_t fde) {
   // fde is own mh_group
   DwarfFDECache<LocalAddressSpace>::removeAllIn((LocalAddressSpace::pint_t)fde);
 }
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
+#endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
 
 
 // Add logging hooks in Debug builds only
 #ifndef NDEBUG
 #include <stdlib.h>
 
 _LIBUNWIND_HIDDEN

libunwind/trunk/src/libunwind_ext.h

extern void unw_iterate_dwarf_unwind_cache(void (*func)(unw_word_t ip_start,
                                                         unw_word_t ip_end,
                                                         unw_word_t fde,
                                                         unw_word_t mh));
 
 // IPI
 extern void _unw_add_dynamic_fde(unw_word_t fde);
 extern void _unw_remove_dynamic_fde(unw_word_t fde);
 
-#if _LIBUNWIND_ARM_EHABI
+#if defined(_LIBUNWIND_ARM_EHABI)
 extern const uint32_t* decode_eht_entry(const uint32_t*, size_t*, size_t*);
 extern _Unwind_Reason_Code _Unwind_VRS_Interpret(_Unwind_Context *context,
                                                  const uint32_t *data,
                                                  size_t offset, size_t len);
 #endif
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // __LIBUNWIND_EXT__