Merge pull request #2892 from ziglang/install-with-zig-build

move some of the installation from cmake to zig build

4 files changed, 1882 insertions, 0 deletions

diff --git a/lib/libunwind/include/__libunwind_config.h b/lib/libunwind/include/__libunwind_config.h
new file mode 100644
index 0000000000..a8e30de13a
--- /dev/null
+++ b/lib/libunwind/include/__libunwind_config.h
@@ -0,0 +1,141 @@
+//===------------------------- __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
+#endif
+
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_X86       8
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_X86_64    32
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_PPC       112
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_PPC64     116
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_ARM64     95
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_ARM       287
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_OR1K      32
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_MIPS      65
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_SPARC     31
+
+#if defined(_LIBUNWIND_IS_NATIVE_ONLY)
+# if defined(__i386__)
+#  define _LIBUNWIND_TARGET_I386
+#  define _LIBUNWIND_CONTEXT_SIZE 8
+#  define _LIBUNWIND_CURSOR_SIZE 15
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_X86
+# elif defined(__x86_64__)
+#  define _LIBUNWIND_TARGET_X86_64 1
+#  if defined(_WIN64)
+#    define _LIBUNWIND_CONTEXT_SIZE 54
+#    ifdef __SEH__
+#      define _LIBUNWIND_CURSOR_SIZE 204
+#    else
+#      define _LIBUNWIND_CURSOR_SIZE 66
+#    endif
+#  else
+#    define _LIBUNWIND_CONTEXT_SIZE 21
+#    define _LIBUNWIND_CURSOR_SIZE 33
+#  endif
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_X86_64
+# elif defined(__powerpc64__)
+#  define _LIBUNWIND_TARGET_PPC64 1
+#  define _LIBUNWIND_CONTEXT_SIZE 167
+#  define _LIBUNWIND_CURSOR_SIZE 179
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_PPC64
+# elif defined(__ppc__)
+#  define _LIBUNWIND_TARGET_PPC 1
+#  define _LIBUNWIND_CONTEXT_SIZE 117
+#  define _LIBUNWIND_CURSOR_SIZE 124
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_PPC
+# elif defined(__aarch64__)
+#  define _LIBUNWIND_TARGET_AARCH64 1
+#  define _LIBUNWIND_CONTEXT_SIZE 66
+#  if defined(__SEH__)
+#    define _LIBUNWIND_CURSOR_SIZE 164
+#  else
+#    define _LIBUNWIND_CURSOR_SIZE 78
+#  endif
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_ARM64
+# elif defined(__arm__)
+#  define _LIBUNWIND_TARGET_ARM 1
+#  if defined(__SEH__)
+#    define _LIBUNWIND_CONTEXT_SIZE 42
+#    define _LIBUNWIND_CURSOR_SIZE 80
+#  elif defined(__ARM_WMMX)
+#    define _LIBUNWIND_CONTEXT_SIZE 61
+#    define _LIBUNWIND_CURSOR_SIZE 68
+#  else
+#    define _LIBUNWIND_CONTEXT_SIZE 42
+#    define _LIBUNWIND_CURSOR_SIZE 49
+#  endif
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_ARM
+# elif defined(__or1k__)
+#  define _LIBUNWIND_TARGET_OR1K 1
+#  define _LIBUNWIND_CONTEXT_SIZE 16
+#  define _LIBUNWIND_CURSOR_SIZE 24
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_OR1K
+# elif defined(__mips__)
+#  if defined(_ABIO32) && _MIPS_SIM == _ABIO32
+#    define _LIBUNWIND_TARGET_MIPS_O32 1
+#    if defined(__mips_hard_float)
+#      define _LIBUNWIND_CONTEXT_SIZE 50
+#      define _LIBUNWIND_CURSOR_SIZE 57
+#    else
+#      define _LIBUNWIND_CONTEXT_SIZE 18
+#      define _LIBUNWIND_CURSOR_SIZE 24
+#    endif
+#  elif defined(_ABIN32) && _MIPS_SIM == _ABIN32
+#    define _LIBUNWIND_TARGET_MIPS_NEWABI 1
+#    if defined(__mips_hard_float)
+#      define _LIBUNWIND_CONTEXT_SIZE 67
+#      define _LIBUNWIND_CURSOR_SIZE 74
+#    else
+#      define _LIBUNWIND_CONTEXT_SIZE 35
+#      define _LIBUNWIND_CURSOR_SIZE 42
+#    endif
+#  elif defined(_ABI64) && _MIPS_SIM == _ABI64
+#    define _LIBUNWIND_TARGET_MIPS_NEWABI 1
+#    if defined(__mips_hard_float)
+#      define _LIBUNWIND_CONTEXT_SIZE 67
+#      define _LIBUNWIND_CURSOR_SIZE 79
+#    else
+#      define _LIBUNWIND_CONTEXT_SIZE 35
+#      define _LIBUNWIND_CURSOR_SIZE 47
+#    endif
+#  else
+#    error "Unsupported MIPS ABI and/or environment"
+#  endif
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_MIPS
+# elif defined(__sparc__)
+  #define _LIBUNWIND_TARGET_SPARC 1
+  #define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_SPARC
+  #define _LIBUNWIND_CONTEXT_SIZE 16
+  #define _LIBUNWIND_CURSOR_SIZE 23
+# else
+#  error "Unsupported architecture."
+# endif
+#else // !_LIBUNWIND_IS_NATIVE_ONLY
+# define _LIBUNWIND_TARGET_I386
+# define _LIBUNWIND_TARGET_X86_64 1
+# define _LIBUNWIND_TARGET_PPC 1
+# define _LIBUNWIND_TARGET_PPC64 1
+# define _LIBUNWIND_TARGET_AARCH64 1
+# define _LIBUNWIND_TARGET_ARM 1
+# define _LIBUNWIND_TARGET_OR1K 1
+# define _LIBUNWIND_TARGET_MIPS_O32 1
+# define _LIBUNWIND_TARGET_MIPS_NEWABI 1
+# define _LIBUNWIND_TARGET_SPARC 1
+# define _LIBUNWIND_CONTEXT_SIZE 167
+# define _LIBUNWIND_CURSOR_SIZE 179
+# define _LIBUNWIND_HIGHEST_DWARF_REGISTER 287
+#endif // _LIBUNWIND_IS_NATIVE_ONLY
+
+#endif // ____LIBUNWIND_CONFIG_H__
diff --git a/lib/libunwind/include/libunwind.h b/lib/libunwind/include/libunwind.h
new file mode 100644
index 0000000000..29c4aebde5
--- /dev/null
+++ b/lib/libunwind/include/libunwind.h
@@ -0,0 +1,862 @@
+//===---------------------------- libunwind.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.
+//
+//
+// Compatible with libunwind API documented at:
+//   http://www.nongnu.org/libunwind/man/libunwind(3).html
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LIBUNWIND__
+#define __LIBUNWIND__
+
+#include <__libunwind_config.h>
+
+#include <stdint.h>
+#include <stddef.h>
+
+#ifdef __APPLE__
+  #if __clang__
+    #if __has_include(<Availability.h>)
+      #include <Availability.h>
+    #endif
+  #elif __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050
+    #include <Availability.h>
+  #endif
+
+  #ifdef __arm__
+     #define LIBUNWIND_AVAIL __attribute__((unavailable))
+  #elif defined(__OSX_AVAILABLE_STARTING)
+    #define LIBUNWIND_AVAIL __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_5_0)
+  #else
+    #include <AvailabilityMacros.h>
+    #ifdef AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER
+      #define LIBUNWIND_AVAIL AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER
+    #else
+      #define LIBUNWIND_AVAIL __attribute__((unavailable))
+    #endif
+  #endif
+#else
+  #define LIBUNWIND_AVAIL
+#endif
+
+/* error codes */
+enum {
+  UNW_ESUCCESS      = 0,     /* no error */
+  UNW_EUNSPEC       = -6540, /* unspecified (general) error */
+  UNW_ENOMEM        = -6541, /* out of memory */
+  UNW_EBADREG       = -6542, /* bad register number */
+  UNW_EREADONLYREG  = -6543, /* attempt to write read-only register */
+  UNW_ESTOPUNWIND   = -6544, /* stop unwinding */
+  UNW_EINVALIDIP    = -6545, /* invalid IP */
+  UNW_EBADFRAME     = -6546, /* bad frame */
+  UNW_EINVAL        = -6547, /* unsupported operation or bad value */
+  UNW_EBADVERSION   = -6548, /* unwind info has unsupported version */
+  UNW_ENOINFO       = -6549  /* no unwind info found */
+#if defined(_LIBUNWIND_TARGET_AARCH64) && !defined(_LIBUNWIND_IS_NATIVE_ONLY)
+  , UNW_ECROSSRASIGNING = -6550 /* cross unwind with return address signing */
+#endif
+};
+
+struct unw_context_t {
+  uint64_t data[_LIBUNWIND_CONTEXT_SIZE];
+};
+typedef struct unw_context_t unw_context_t;
+
+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;
+typedef uintptr_t unw_word_t;
+#if defined(__arm__)
+typedef uint64_t unw_fpreg_t;
+#else
+typedef double unw_fpreg_t;
+#endif
+
+struct unw_proc_info_t {
+  unw_word_t  start_ip;         /* start address of function */
+  unw_word_t  end_ip;           /* address after end of function */
+  unw_word_t  lsda;             /* address of language specific data area, */
+                                /*  or zero if not used */
+  unw_word_t  handler;          /* personality routine, or zero if not used */
+  unw_word_t  gp;               /* not used */
+  unw_word_t  flags;            /* not used */
+  uint32_t    format;           /* compact unwind encoding, or zero if none */
+  uint32_t    unwind_info_size; /* size of DWARF unwind info, or zero if none */
+  unw_word_t  unwind_info;      /* address of DWARF unwind info, or zero */
+  unw_word_t  extra;            /* mach_header of mach-o image containing func */
+};
+typedef struct unw_proc_info_t unw_proc_info_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int unw_getcontext(unw_context_t *) LIBUNWIND_AVAIL;
+extern int unw_init_local(unw_cursor_t *, unw_context_t *) LIBUNWIND_AVAIL;
+extern int unw_step(unw_cursor_t *) LIBUNWIND_AVAIL;
+extern int unw_get_reg(unw_cursor_t *, unw_regnum_t, unw_word_t *) LIBUNWIND_AVAIL;
+extern int unw_get_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t *) LIBUNWIND_AVAIL;
+extern int unw_set_reg(unw_cursor_t *, unw_regnum_t, unw_word_t) LIBUNWIND_AVAIL;
+extern int unw_set_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t)  LIBUNWIND_AVAIL;
+extern int unw_resume(unw_cursor_t *) LIBUNWIND_AVAIL;
+
+#ifdef __arm__
+/* Save VFP registers in FSTMX format (instead of FSTMD). */
+extern void unw_save_vfp_as_X(unw_cursor_t *) LIBUNWIND_AVAIL;
+#endif
+
+
+extern const char *unw_regname(unw_cursor_t *, unw_regnum_t) LIBUNWIND_AVAIL;
+extern int unw_get_proc_info(unw_cursor_t *, unw_proc_info_t *) LIBUNWIND_AVAIL;
+extern int unw_is_fpreg(unw_cursor_t *, unw_regnum_t) LIBUNWIND_AVAIL;
+extern int unw_is_signal_frame(unw_cursor_t *) LIBUNWIND_AVAIL;
+extern int unw_get_proc_name(unw_cursor_t *, char *, size_t, unw_word_t *) LIBUNWIND_AVAIL;
+//extern int       unw_get_save_loc(unw_cursor_t*, int, unw_save_loc_t*);
+
+extern unw_addr_space_t unw_local_addr_space;
+
+#ifdef UNW_REMOTE
+/*
+ * Mac OS X "remote" API for unwinding other processes on same machine
+ *
+ */
+extern unw_addr_space_t unw_create_addr_space_for_task(task_t);
+extern void unw_destroy_addr_space(unw_addr_space_t);
+extern int unw_init_remote_thread(unw_cursor_t *, unw_addr_space_t, thread_t *);
+#endif /* UNW_REMOTE */
+
+/*
+ * traditional libunwind "remote" API
+ *   NOT IMPLEMENTED on Mac OS X
+ *
+ * extern int               unw_init_remote(unw_cursor_t*, unw_addr_space_t,
+ *                                          thread_t*);
+ * extern unw_accessors_t   unw_get_accessors(unw_addr_space_t);
+ * extern unw_addr_space_t  unw_create_addr_space(unw_accessors_t, int);
+ * extern void              unw_flush_cache(unw_addr_space_t, unw_word_t,
+ *                                          unw_word_t);
+ * extern int               unw_set_caching_policy(unw_addr_space_t,
+ *                                                 unw_caching_policy_t);
+ * extern void              _U_dyn_register(unw_dyn_info_t*);
+ * extern void              _U_dyn_cancel(unw_dyn_info_t*);
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+// architecture independent register numbers
+enum {
+  UNW_REG_IP = -1, // instruction pointer
+  UNW_REG_SP = -2, // stack pointer
+};
+
+// 32-bit x86 registers
+enum {
+  UNW_X86_EAX = 0,
+  UNW_X86_ECX = 1,
+  UNW_X86_EDX = 2,
+  UNW_X86_EBX = 3,
+  UNW_X86_EBP = 4,
+  UNW_X86_ESP = 5,
+  UNW_X86_ESI = 6,
+  UNW_X86_EDI = 7
+};
+
+// 64-bit x86_64 registers
+enum {
+  UNW_X86_64_RAX = 0,
+  UNW_X86_64_RDX = 1,
+  UNW_X86_64_RCX = 2,
+  UNW_X86_64_RBX = 3,
+  UNW_X86_64_RSI = 4,
+  UNW_X86_64_RDI = 5,
+  UNW_X86_64_RBP = 6,
+  UNW_X86_64_RSP = 7,
+  UNW_X86_64_R8  = 8,
+  UNW_X86_64_R9  = 9,
+  UNW_X86_64_R10 = 10,
+  UNW_X86_64_R11 = 11,
+  UNW_X86_64_R12 = 12,
+  UNW_X86_64_R13 = 13,
+  UNW_X86_64_R14 = 14,
+  UNW_X86_64_R15 = 15,
+  UNW_X86_64_RIP = 16,
+  UNW_X86_64_XMM0 = 17,
+  UNW_X86_64_XMM1 = 18,
+  UNW_X86_64_XMM2 = 19,
+  UNW_X86_64_XMM3 = 20,
+  UNW_X86_64_XMM4 = 21,
+  UNW_X86_64_XMM5 = 22,
+  UNW_X86_64_XMM6 = 23,
+  UNW_X86_64_XMM7 = 24,
+  UNW_X86_64_XMM8 = 25,
+  UNW_X86_64_XMM9 = 26,
+  UNW_X86_64_XMM10 = 27,
+  UNW_X86_64_XMM11 = 28,
+  UNW_X86_64_XMM12 = 29,
+  UNW_X86_64_XMM13 = 30,
+  UNW_X86_64_XMM14 = 31,
+  UNW_X86_64_XMM15 = 32,
+};
+
+
+// 32-bit ppc register numbers
+enum {
+  UNW_PPC_R0  = 0,
+  UNW_PPC_R1  = 1,
+  UNW_PPC_R2  = 2,
+  UNW_PPC_R3  = 3,
+  UNW_PPC_R4  = 4,
+  UNW_PPC_R5  = 5,
+  UNW_PPC_R6  = 6,
+  UNW_PPC_R7  = 7,
+  UNW_PPC_R8  = 8,
+  UNW_PPC_R9  = 9,
+  UNW_PPC_R10 = 10,
+  UNW_PPC_R11 = 11,
+  UNW_PPC_R12 = 12,
+  UNW_PPC_R13 = 13,
+  UNW_PPC_R14 = 14,
+  UNW_PPC_R15 = 15,
+  UNW_PPC_R16 = 16,
+  UNW_PPC_R17 = 17,
+  UNW_PPC_R18 = 18,
+  UNW_PPC_R19 = 19,
+  UNW_PPC_R20 = 20,
+  UNW_PPC_R21 = 21,
+  UNW_PPC_R22 = 22,
+  UNW_PPC_R23 = 23,
+  UNW_PPC_R24 = 24,
+  UNW_PPC_R25 = 25,
+  UNW_PPC_R26 = 26,
+  UNW_PPC_R27 = 27,
+  UNW_PPC_R28 = 28,
+  UNW_PPC_R29 = 29,
+  UNW_PPC_R30 = 30,
+  UNW_PPC_R31 = 31,
+  UNW_PPC_F0  = 32,
+  UNW_PPC_F1  = 33,
+  UNW_PPC_F2  = 34,
+  UNW_PPC_F3  = 35,
+  UNW_PPC_F4  = 36,
+  UNW_PPC_F5  = 37,
+  UNW_PPC_F6  = 38,
+  UNW_PPC_F7  = 39,
+  UNW_PPC_F8  = 40,
+  UNW_PPC_F9  = 41,
+  UNW_PPC_F10 = 42,
+  UNW_PPC_F11 = 43,
+  UNW_PPC_F12 = 44,
+  UNW_PPC_F13 = 45,
+  UNW_PPC_F14 = 46,
+  UNW_PPC_F15 = 47,
+  UNW_PPC_F16 = 48,
+  UNW_PPC_F17 = 49,
+  UNW_PPC_F18 = 50,
+  UNW_PPC_F19 = 51,
+  UNW_PPC_F20 = 52,
+  UNW_PPC_F21 = 53,
+  UNW_PPC_F22 = 54,
+  UNW_PPC_F23 = 55,
+  UNW_PPC_F24 = 56,
+  UNW_PPC_F25 = 57,
+  UNW_PPC_F26 = 58,
+  UNW_PPC_F27 = 59,
+  UNW_PPC_F28 = 60,
+  UNW_PPC_F29 = 61,
+  UNW_PPC_F30 = 62,
+  UNW_PPC_F31 = 63,
+  UNW_PPC_MQ  = 64,
+  UNW_PPC_LR  = 65,
+  UNW_PPC_CTR = 66,
+  UNW_PPC_AP  = 67,
+  UNW_PPC_CR0 = 68,
+  UNW_PPC_CR1 = 69,
+  UNW_PPC_CR2 = 70,
+  UNW_PPC_CR3 = 71,
+  UNW_PPC_CR4 = 72,
+  UNW_PPC_CR5 = 73,
+  UNW_PPC_CR6 = 74,
+  UNW_PPC_CR7 = 75,
+  UNW_PPC_XER = 76,
+  UNW_PPC_V0  = 77,
+  UNW_PPC_V1  = 78,
+  UNW_PPC_V2  = 79,
+  UNW_PPC_V3  = 80,
+  UNW_PPC_V4  = 81,
+  UNW_PPC_V5  = 82,
+  UNW_PPC_V6  = 83,
+  UNW_PPC_V7  = 84,
+  UNW_PPC_V8  = 85,
+  UNW_PPC_V9  = 86,
+  UNW_PPC_V10 = 87,
+  UNW_PPC_V11 = 88,
+  UNW_PPC_V12 = 89,
+  UNW_PPC_V13 = 90,
+  UNW_PPC_V14 = 91,
+  UNW_PPC_V15 = 92,
+  UNW_PPC_V16 = 93,
+  UNW_PPC_V17 = 94,
+  UNW_PPC_V18 = 95,
+  UNW_PPC_V19 = 96,
+  UNW_PPC_V20 = 97,
+  UNW_PPC_V21 = 98,
+  UNW_PPC_V22 = 99,
+  UNW_PPC_V23 = 100,
+  UNW_PPC_V24 = 101,
+  UNW_PPC_V25 = 102,
+  UNW_PPC_V26 = 103,
+  UNW_PPC_V27 = 104,
+  UNW_PPC_V28 = 105,
+  UNW_PPC_V29 = 106,
+  UNW_PPC_V30 = 107,
+  UNW_PPC_V31 = 108,
+  UNW_PPC_VRSAVE  = 109,
+  UNW_PPC_VSCR    = 110,
+  UNW_PPC_SPE_ACC = 111,
+  UNW_PPC_SPEFSCR = 112
+};
+
+// 64-bit ppc register numbers
+enum {
+  UNW_PPC64_R0      = 0,
+  UNW_PPC64_R1      = 1,
+  UNW_PPC64_R2      = 2,
+  UNW_PPC64_R3      = 3,
+  UNW_PPC64_R4      = 4,
+  UNW_PPC64_R5      = 5,
+  UNW_PPC64_R6      = 6,
+  UNW_PPC64_R7      = 7,
+  UNW_PPC64_R8      = 8,
+  UNW_PPC64_R9      = 9,
+  UNW_PPC64_R10     = 10,
+  UNW_PPC64_R11     = 11,
+  UNW_PPC64_R12     = 12,
+  UNW_PPC64_R13     = 13,
+  UNW_PPC64_R14     = 14,
+  UNW_PPC64_R15     = 15,
+  UNW_PPC64_R16     = 16,
+  UNW_PPC64_R17     = 17,
+  UNW_PPC64_R18     = 18,
+  UNW_PPC64_R19     = 19,
+  UNW_PPC64_R20     = 20,
+  UNW_PPC64_R21     = 21,
+  UNW_PPC64_R22     = 22,
+  UNW_PPC64_R23     = 23,
+  UNW_PPC64_R24     = 24,
+  UNW_PPC64_R25     = 25,
+  UNW_PPC64_R26     = 26,
+  UNW_PPC64_R27     = 27,
+  UNW_PPC64_R28     = 28,
+  UNW_PPC64_R29     = 29,
+  UNW_PPC64_R30     = 30,
+  UNW_PPC64_R31     = 31,
+  UNW_PPC64_F0      = 32,
+  UNW_PPC64_F1      = 33,
+  UNW_PPC64_F2      = 34,
+  UNW_PPC64_F3      = 35,
+  UNW_PPC64_F4      = 36,
+  UNW_PPC64_F5      = 37,
+  UNW_PPC64_F6      = 38,
+  UNW_PPC64_F7      = 39,
+  UNW_PPC64_F8      = 40,
+  UNW_PPC64_F9      = 41,
+  UNW_PPC64_F10     = 42,
+  UNW_PPC64_F11     = 43,
+  UNW_PPC64_F12     = 44,
+  UNW_PPC64_F13     = 45,
+  UNW_PPC64_F14     = 46,
+  UNW_PPC64_F15     = 47,
+  UNW_PPC64_F16     = 48,
+  UNW_PPC64_F17     = 49,
+  UNW_PPC64_F18     = 50,
+  UNW_PPC64_F19     = 51,
+  UNW_PPC64_F20     = 52,
+  UNW_PPC64_F21     = 53,
+  UNW_PPC64_F22     = 54,
+  UNW_PPC64_F23     = 55,
+  UNW_PPC64_F24     = 56,
+  UNW_PPC64_F25     = 57,
+  UNW_PPC64_F26     = 58,
+  UNW_PPC64_F27     = 59,
+  UNW_PPC64_F28     = 60,
+  UNW_PPC64_F29     = 61,
+  UNW_PPC64_F30     = 62,
+  UNW_PPC64_F31     = 63,
+  // 64: reserved
+  UNW_PPC64_LR      = 65,
+  UNW_PPC64_CTR     = 66,
+  // 67: reserved
+  UNW_PPC64_CR0     = 68,
+  UNW_PPC64_CR1     = 69,
+  UNW_PPC64_CR2     = 70,
+  UNW_PPC64_CR3     = 71,
+  UNW_PPC64_CR4     = 72,
+  UNW_PPC64_CR5     = 73,
+  UNW_PPC64_CR6     = 74,
+  UNW_PPC64_CR7     = 75,
+  UNW_PPC64_XER     = 76,
+  UNW_PPC64_V0      = 77,
+  UNW_PPC64_V1      = 78,
+  UNW_PPC64_V2      = 79,
+  UNW_PPC64_V3      = 80,
+  UNW_PPC64_V4      = 81,
+  UNW_PPC64_V5      = 82,
+  UNW_PPC64_V6      = 83,
+  UNW_PPC64_V7      = 84,
+  UNW_PPC64_V8      = 85,
+  UNW_PPC64_V9      = 86,
+  UNW_PPC64_V10     = 87,
+  UNW_PPC64_V11     = 88,
+  UNW_PPC64_V12     = 89,
+  UNW_PPC64_V13     = 90,
+  UNW_PPC64_V14     = 91,
+  UNW_PPC64_V15     = 92,
+  UNW_PPC64_V16     = 93,
+  UNW_PPC64_V17     = 94,
+  UNW_PPC64_V18     = 95,
+  UNW_PPC64_V19     = 96,
+  UNW_PPC64_V20     = 97,
+  UNW_PPC64_V21     = 98,
+  UNW_PPC64_V22     = 99,
+  UNW_PPC64_V23     = 100,
+  UNW_PPC64_V24     = 101,
+  UNW_PPC64_V25     = 102,
+  UNW_PPC64_V26     = 103,
+  UNW_PPC64_V27     = 104,
+  UNW_PPC64_V28     = 105,
+  UNW_PPC64_V29     = 106,
+  UNW_PPC64_V30     = 107,
+  UNW_PPC64_V31     = 108,
+  // 109, 111-113: OpenPOWER ELF V2 ABI: reserved
+  // Borrowing VRSAVE number from PPC32.
+  UNW_PPC64_VRSAVE  = 109,
+  UNW_PPC64_VSCR    = 110,
+  UNW_PPC64_TFHAR   = 114,
+  UNW_PPC64_TFIAR   = 115,
+  UNW_PPC64_TEXASR  = 116,
+  UNW_PPC64_VS0     = UNW_PPC64_F0,
+  UNW_PPC64_VS1     = UNW_PPC64_F1,
+  UNW_PPC64_VS2     = UNW_PPC64_F2,
+  UNW_PPC64_VS3     = UNW_PPC64_F3,
+  UNW_PPC64_VS4     = UNW_PPC64_F4,
+  UNW_PPC64_VS5     = UNW_PPC64_F5,
+  UNW_PPC64_VS6     = UNW_PPC64_F6,
+  UNW_PPC64_VS7     = UNW_PPC64_F7,
+  UNW_PPC64_VS8     = UNW_PPC64_F8,
+  UNW_PPC64_VS9     = UNW_PPC64_F9,
+  UNW_PPC64_VS10    = UNW_PPC64_F10,
+  UNW_PPC64_VS11    = UNW_PPC64_F11,
+  UNW_PPC64_VS12    = UNW_PPC64_F12,
+  UNW_PPC64_VS13    = UNW_PPC64_F13,
+  UNW_PPC64_VS14    = UNW_PPC64_F14,
+  UNW_PPC64_VS15    = UNW_PPC64_F15,
+  UNW_PPC64_VS16    = UNW_PPC64_F16,
+  UNW_PPC64_VS17    = UNW_PPC64_F17,
+  UNW_PPC64_VS18    = UNW_PPC64_F18,
+  UNW_PPC64_VS19    = UNW_PPC64_F19,
+  UNW_PPC64_VS20    = UNW_PPC64_F20,
+  UNW_PPC64_VS21    = UNW_PPC64_F21,
+  UNW_PPC64_VS22    = UNW_PPC64_F22,
+  UNW_PPC64_VS23    = UNW_PPC64_F23,
+  UNW_PPC64_VS24    = UNW_PPC64_F24,
+  UNW_PPC64_VS25    = UNW_PPC64_F25,
+  UNW_PPC64_VS26    = UNW_PPC64_F26,
+  UNW_PPC64_VS27    = UNW_PPC64_F27,
+  UNW_PPC64_VS28    = UNW_PPC64_F28,
+  UNW_PPC64_VS29    = UNW_PPC64_F29,
+  UNW_PPC64_VS30    = UNW_PPC64_F30,
+  UNW_PPC64_VS31    = UNW_PPC64_F31,
+  UNW_PPC64_VS32    = UNW_PPC64_V0,
+  UNW_PPC64_VS33    = UNW_PPC64_V1,
+  UNW_PPC64_VS34    = UNW_PPC64_V2,
+  UNW_PPC64_VS35    = UNW_PPC64_V3,
+  UNW_PPC64_VS36    = UNW_PPC64_V4,
+  UNW_PPC64_VS37    = UNW_PPC64_V5,
+  UNW_PPC64_VS38    = UNW_PPC64_V6,
+  UNW_PPC64_VS39    = UNW_PPC64_V7,
+  UNW_PPC64_VS40    = UNW_PPC64_V8,
+  UNW_PPC64_VS41    = UNW_PPC64_V9,
+  UNW_PPC64_VS42    = UNW_PPC64_V10,
+  UNW_PPC64_VS43    = UNW_PPC64_V11,
+  UNW_PPC64_VS44    = UNW_PPC64_V12,
+  UNW_PPC64_VS45    = UNW_PPC64_V13,
+  UNW_PPC64_VS46    = UNW_PPC64_V14,
+  UNW_PPC64_VS47    = UNW_PPC64_V15,
+  UNW_PPC64_VS48    = UNW_PPC64_V16,
+  UNW_PPC64_VS49    = UNW_PPC64_V17,
+  UNW_PPC64_VS50    = UNW_PPC64_V18,
+  UNW_PPC64_VS51    = UNW_PPC64_V19,
+  UNW_PPC64_VS52    = UNW_PPC64_V20,
+  UNW_PPC64_VS53    = UNW_PPC64_V21,
+  UNW_PPC64_VS54    = UNW_PPC64_V22,
+  UNW_PPC64_VS55    = UNW_PPC64_V23,
+  UNW_PPC64_VS56    = UNW_PPC64_V24,
+  UNW_PPC64_VS57    = UNW_PPC64_V25,
+  UNW_PPC64_VS58    = UNW_PPC64_V26,
+  UNW_PPC64_VS59    = UNW_PPC64_V27,
+  UNW_PPC64_VS60    = UNW_PPC64_V28,
+  UNW_PPC64_VS61    = UNW_PPC64_V29,
+  UNW_PPC64_VS62    = UNW_PPC64_V30,
+  UNW_PPC64_VS63    = UNW_PPC64_V31
+};
+
+// 64-bit ARM64 registers
+enum {
+  UNW_ARM64_X0  = 0,
+  UNW_ARM64_X1  = 1,
+  UNW_ARM64_X2  = 2,
+  UNW_ARM64_X3  = 3,
+  UNW_ARM64_X4  = 4,
+  UNW_ARM64_X5  = 5,
+  UNW_ARM64_X6  = 6,
+  UNW_ARM64_X7  = 7,
+  UNW_ARM64_X8  = 8,
+  UNW_ARM64_X9  = 9,
+  UNW_ARM64_X10 = 10,
+  UNW_ARM64_X11 = 11,
+  UNW_ARM64_X12 = 12,
+  UNW_ARM64_X13 = 13,
+  UNW_ARM64_X14 = 14,
+  UNW_ARM64_X15 = 15,
+  UNW_ARM64_X16 = 16,
+  UNW_ARM64_X17 = 17,
+  UNW_ARM64_X18 = 18,
+  UNW_ARM64_X19 = 19,
+  UNW_ARM64_X20 = 20,
+  UNW_ARM64_X21 = 21,
+  UNW_ARM64_X22 = 22,
+  UNW_ARM64_X23 = 23,
+  UNW_ARM64_X24 = 24,
+  UNW_ARM64_X25 = 25,
+  UNW_ARM64_X26 = 26,
+  UNW_ARM64_X27 = 27,
+  UNW_ARM64_X28 = 28,
+  UNW_ARM64_X29 = 29,
+  UNW_ARM64_FP  = 29,
+  UNW_ARM64_X30 = 30,
+  UNW_ARM64_LR  = 30,
+  UNW_ARM64_X31 = 31,
+  UNW_ARM64_SP  = 31,
+  // reserved block
+  UNW_ARM64_RA_SIGN_STATE = 34,
+  // reserved block
+  UNW_ARM64_D0  = 64,
+  UNW_ARM64_D1  = 65,
+  UNW_ARM64_D2  = 66,
+  UNW_ARM64_D3  = 67,
+  UNW_ARM64_D4  = 68,
+  UNW_ARM64_D5  = 69,
+  UNW_ARM64_D6  = 70,
+  UNW_ARM64_D7  = 71,
+  UNW_ARM64_D8  = 72,
+  UNW_ARM64_D9  = 73,
+  UNW_ARM64_D10 = 74,
+  UNW_ARM64_D11 = 75,
+  UNW_ARM64_D12 = 76,
+  UNW_ARM64_D13 = 77,
+  UNW_ARM64_D14 = 78,
+  UNW_ARM64_D15 = 79,
+  UNW_ARM64_D16 = 80,
+  UNW_ARM64_D17 = 81,
+  UNW_ARM64_D18 = 82,
+  UNW_ARM64_D19 = 83,
+  UNW_ARM64_D20 = 84,
+  UNW_ARM64_D21 = 85,
+  UNW_ARM64_D22 = 86,
+  UNW_ARM64_D23 = 87,
+  UNW_ARM64_D24 = 88,
+  UNW_ARM64_D25 = 89,
+  UNW_ARM64_D26 = 90,
+  UNW_ARM64_D27 = 91,
+  UNW_ARM64_D28 = 92,
+  UNW_ARM64_D29 = 93,
+  UNW_ARM64_D30 = 94,
+  UNW_ARM64_D31 = 95,
+};
+
+// 32-bit ARM registers. Numbers match DWARF for ARM spec #3.1 Table 1.
+// Naming scheme uses recommendations given in Note 4 for VFP-v2 and VFP-v3.
+// In this scheme, even though the 64-bit floating point registers D0-D31
+// overlap physically with the 32-bit floating pointer registers S0-S31,
+// they are given a non-overlapping range of register numbers.
+//
+// Commented out ranges are not preserved during unwinding.
+enum {
+  UNW_ARM_R0  = 0,
+  UNW_ARM_R1  = 1,
+  UNW_ARM_R2  = 2,
+  UNW_ARM_R3  = 3,
+  UNW_ARM_R4  = 4,
+  UNW_ARM_R5  = 5,
+  UNW_ARM_R6  = 6,
+  UNW_ARM_R7  = 7,
+  UNW_ARM_R8  = 8,
+  UNW_ARM_R9  = 9,
+  UNW_ARM_R10 = 10,
+  UNW_ARM_R11 = 11,
+  UNW_ARM_R12 = 12,
+  UNW_ARM_SP  = 13,  // Logical alias for UNW_REG_SP
+  UNW_ARM_R13 = 13,
+  UNW_ARM_LR  = 14,
+  UNW_ARM_R14 = 14,
+  UNW_ARM_IP  = 15,  // Logical alias for UNW_REG_IP
+  UNW_ARM_R15 = 15,
+  // 16-63 -- OBSOLETE. Used in VFP1 to represent both S0-S31 and D0-D31.
+  UNW_ARM_S0  = 64,
+  UNW_ARM_S1  = 65,
+  UNW_ARM_S2  = 66,
+  UNW_ARM_S3  = 67,
+  UNW_ARM_S4  = 68,
+  UNW_ARM_S5  = 69,
+  UNW_ARM_S6  = 70,
+  UNW_ARM_S7  = 71,
+  UNW_ARM_S8  = 72,
+  UNW_ARM_S9  = 73,
+  UNW_ARM_S10 = 74,
+  UNW_ARM_S11 = 75,
+  UNW_ARM_S12 = 76,
+  UNW_ARM_S13 = 77,
+  UNW_ARM_S14 = 78,
+  UNW_ARM_S15 = 79,
+  UNW_ARM_S16 = 80,
+  UNW_ARM_S17 = 81,
+  UNW_ARM_S18 = 82,
+  UNW_ARM_S19 = 83,
+  UNW_ARM_S20 = 84,
+  UNW_ARM_S21 = 85,
+  UNW_ARM_S22 = 86,
+  UNW_ARM_S23 = 87,
+  UNW_ARM_S24 = 88,
+  UNW_ARM_S25 = 89,
+  UNW_ARM_S26 = 90,
+  UNW_ARM_S27 = 91,
+  UNW_ARM_S28 = 92,
+  UNW_ARM_S29 = 93,
+  UNW_ARM_S30 = 94,
+  UNW_ARM_S31 = 95,
+  //  96-103 -- OBSOLETE. F0-F7. Used by the FPA system. Superseded by VFP.
+  // 104-111 -- wCGR0-wCGR7, ACC0-ACC7 (Intel wireless MMX)
+  UNW_ARM_WR0 = 112,
+  UNW_ARM_WR1 = 113,
+  UNW_ARM_WR2 = 114,
+  UNW_ARM_WR3 = 115,
+  UNW_ARM_WR4 = 116,
+  UNW_ARM_WR5 = 117,
+  UNW_ARM_WR6 = 118,
+  UNW_ARM_WR7 = 119,
+  UNW_ARM_WR8 = 120,
+  UNW_ARM_WR9 = 121,
+  UNW_ARM_WR10 = 122,
+  UNW_ARM_WR11 = 123,
+  UNW_ARM_WR12 = 124,
+  UNW_ARM_WR13 = 125,
+  UNW_ARM_WR14 = 126,
+  UNW_ARM_WR15 = 127,
+  // 128-133 -- SPSR, SPSR_{FIQ|IRQ|ABT|UND|SVC}
+  // 134-143 -- Reserved
+  // 144-150 -- R8_USR-R14_USR
+  // 151-157 -- R8_FIQ-R14_FIQ
+  // 158-159 -- R13_IRQ-R14_IRQ
+  // 160-161 -- R13_ABT-R14_ABT
+  // 162-163 -- R13_UND-R14_UND
+  // 164-165 -- R13_SVC-R14_SVC
+  // 166-191 -- Reserved
+  UNW_ARM_WC0 = 192,
+  UNW_ARM_WC1 = 193,
+  UNW_ARM_WC2 = 194,
+  UNW_ARM_WC3 = 195,
+  // 196-199 -- wC4-wC7 (Intel wireless MMX control)
+  // 200-255 -- Reserved
+  UNW_ARM_D0  = 256,
+  UNW_ARM_D1  = 257,
+  UNW_ARM_D2  = 258,
+  UNW_ARM_D3  = 259,
+  UNW_ARM_D4  = 260,
+  UNW_ARM_D5  = 261,
+  UNW_ARM_D6  = 262,
+  UNW_ARM_D7  = 263,
+  UNW_ARM_D8  = 264,
+  UNW_ARM_D9  = 265,
+  UNW_ARM_D10 = 266,
+  UNW_ARM_D11 = 267,
+  UNW_ARM_D12 = 268,
+  UNW_ARM_D13 = 269,
+  UNW_ARM_D14 = 270,
+  UNW_ARM_D15 = 271,
+  UNW_ARM_D16 = 272,
+  UNW_ARM_D17 = 273,
+  UNW_ARM_D18 = 274,
+  UNW_ARM_D19 = 275,
+  UNW_ARM_D20 = 276,
+  UNW_ARM_D21 = 277,
+  UNW_ARM_D22 = 278,
+  UNW_ARM_D23 = 279,
+  UNW_ARM_D24 = 280,
+  UNW_ARM_D25 = 281,
+  UNW_ARM_D26 = 282,
+  UNW_ARM_D27 = 283,
+  UNW_ARM_D28 = 284,
+  UNW_ARM_D29 = 285,
+  UNW_ARM_D30 = 286,
+  UNW_ARM_D31 = 287,
+  // 288-319 -- Reserved for VFP/Neon
+  // 320-8191 -- Reserved
+  // 8192-16383 -- Unspecified vendor co-processor register.
+};
+
+// OpenRISC1000 register numbers
+enum {
+  UNW_OR1K_R0  = 0,
+  UNW_OR1K_R1  = 1,
+  UNW_OR1K_R2  = 2,
+  UNW_OR1K_R3  = 3,
+  UNW_OR1K_R4  = 4,
+  UNW_OR1K_R5  = 5,
+  UNW_OR1K_R6  = 6,
+  UNW_OR1K_R7  = 7,
+  UNW_OR1K_R8  = 8,
+  UNW_OR1K_R9  = 9,
+  UNW_OR1K_R10 = 10,
+  UNW_OR1K_R11 = 11,
+  UNW_OR1K_R12 = 12,
+  UNW_OR1K_R13 = 13,
+  UNW_OR1K_R14 = 14,
+  UNW_OR1K_R15 = 15,
+  UNW_OR1K_R16 = 16,
+  UNW_OR1K_R17 = 17,
+  UNW_OR1K_R18 = 18,
+  UNW_OR1K_R19 = 19,
+  UNW_OR1K_R20 = 20,
+  UNW_OR1K_R21 = 21,
+  UNW_OR1K_R22 = 22,
+  UNW_OR1K_R23 = 23,
+  UNW_OR1K_R24 = 24,
+  UNW_OR1K_R25 = 25,
+  UNW_OR1K_R26 = 26,
+  UNW_OR1K_R27 = 27,
+  UNW_OR1K_R28 = 28,
+  UNW_OR1K_R29 = 29,
+  UNW_OR1K_R30 = 30,
+  UNW_OR1K_R31 = 31,
+  UNW_OR1K_EPCR = 32,
+};
+
+// MIPS registers
+enum {
+  UNW_MIPS_R0  = 0,
+  UNW_MIPS_R1  = 1,
+  UNW_MIPS_R2  = 2,
+  UNW_MIPS_R3  = 3,
+  UNW_MIPS_R4  = 4,
+  UNW_MIPS_R5  = 5,
+  UNW_MIPS_R6  = 6,
+  UNW_MIPS_R7  = 7,
+  UNW_MIPS_R8  = 8,
+  UNW_MIPS_R9  = 9,
+  UNW_MIPS_R10 = 10,
+  UNW_MIPS_R11 = 11,
+  UNW_MIPS_R12 = 12,
+  UNW_MIPS_R13 = 13,
+  UNW_MIPS_R14 = 14,
+  UNW_MIPS_R15 = 15,
+  UNW_MIPS_R16 = 16,
+  UNW_MIPS_R17 = 17,
+  UNW_MIPS_R18 = 18,
+  UNW_MIPS_R19 = 19,
+  UNW_MIPS_R20 = 20,
+  UNW_MIPS_R21 = 21,
+  UNW_MIPS_R22 = 22,
+  UNW_MIPS_R23 = 23,
+  UNW_MIPS_R24 = 24,
+  UNW_MIPS_R25 = 25,
+  UNW_MIPS_R26 = 26,
+  UNW_MIPS_R27 = 27,
+  UNW_MIPS_R28 = 28,
+  UNW_MIPS_R29 = 29,
+  UNW_MIPS_R30 = 30,
+  UNW_MIPS_R31 = 31,
+  UNW_MIPS_F0  = 32,
+  UNW_MIPS_F1  = 33,
+  UNW_MIPS_F2  = 34,
+  UNW_MIPS_F3  = 35,
+  UNW_MIPS_F4  = 36,
+  UNW_MIPS_F5  = 37,
+  UNW_MIPS_F6  = 38,
+  UNW_MIPS_F7  = 39,
+  UNW_MIPS_F8  = 40,
+  UNW_MIPS_F9  = 41,
+  UNW_MIPS_F10 = 42,
+  UNW_MIPS_F11 = 43,
+  UNW_MIPS_F12 = 44,
+  UNW_MIPS_F13 = 45,
+  UNW_MIPS_F14 = 46,
+  UNW_MIPS_F15 = 47,
+  UNW_MIPS_F16 = 48,
+  UNW_MIPS_F17 = 49,
+  UNW_MIPS_F18 = 50,
+  UNW_MIPS_F19 = 51,
+  UNW_MIPS_F20 = 52,
+  UNW_MIPS_F21 = 53,
+  UNW_MIPS_F22 = 54,
+  UNW_MIPS_F23 = 55,
+  UNW_MIPS_F24 = 56,
+  UNW_MIPS_F25 = 57,
+  UNW_MIPS_F26 = 58,
+  UNW_MIPS_F27 = 59,
+  UNW_MIPS_F28 = 60,
+  UNW_MIPS_F29 = 61,
+  UNW_MIPS_F30 = 62,
+  UNW_MIPS_F31 = 63,
+  UNW_MIPS_HI = 64,
+  UNW_MIPS_LO = 65,
+};
+
+// SPARC registers
+enum {
+  UNW_SPARC_G0 = 0,
+  UNW_SPARC_G1 = 1,
+  UNW_SPARC_G2 = 2,
+  UNW_SPARC_G3 = 3,
+  UNW_SPARC_G4 = 4,
+  UNW_SPARC_G5 = 5,
+  UNW_SPARC_G6 = 6,
+  UNW_SPARC_G7 = 7,
+  UNW_SPARC_O0 = 8,
+  UNW_SPARC_O1 = 9,
+  UNW_SPARC_O2 = 10,
+  UNW_SPARC_O3 = 11,
+  UNW_SPARC_O4 = 12,
+  UNW_SPARC_O5 = 13,
+  UNW_SPARC_O6 = 14,
+  UNW_SPARC_O7 = 15,
+  UNW_SPARC_L0 = 16,
+  UNW_SPARC_L1 = 17,
+  UNW_SPARC_L2 = 18,
+  UNW_SPARC_L3 = 19,
+  UNW_SPARC_L4 = 20,
+  UNW_SPARC_L5 = 21,
+  UNW_SPARC_L6 = 22,
+  UNW_SPARC_L7 = 23,
+  UNW_SPARC_I0 = 24,
+  UNW_SPARC_I1 = 25,
+  UNW_SPARC_I2 = 26,
+  UNW_SPARC_I3 = 27,
+  UNW_SPARC_I4 = 28,
+  UNW_SPARC_I5 = 29,
+  UNW_SPARC_I6 = 30,
+  UNW_SPARC_I7 = 31,
+};
+
+#endif
diff --git a/lib/libunwind/include/mach-o/compact_unwind_encoding.h b/lib/libunwind/include/mach-o/compact_unwind_encoding.h
new file mode 100644
index 0000000000..de14fd51e5
--- /dev/null
+++ b/lib/libunwind/include/mach-o/compact_unwind_encoding.h
@@ -0,0 +1,478 @@
+//===------------------ mach-o/compact_unwind_encoding.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.
+//
+//
+// Darwin's alternative to DWARF based unwind encodings.
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef __COMPACT_UNWIND_ENCODING__
+#define __COMPACT_UNWIND_ENCODING__
+
+#include <stdint.h>
+
+//
+// Compilers can emit standard DWARF FDEs in the __TEXT,__eh_frame section
+// of object files. Or compilers can emit compact unwind information in
+// the __LD,__compact_unwind section.
+//
+// When the linker creates a final linked image, it will create a
+// __TEXT,__unwind_info section.  This section is a small and fast way for the
+// runtime to access unwind info for any given function.  If the compiler
+// emitted compact unwind info for the function, that compact unwind info will
+// be encoded in the __TEXT,__unwind_info section. If the compiler emitted
+// DWARF unwind info, the __TEXT,__unwind_info section will contain the offset
+// of the FDE in the __TEXT,__eh_frame section in the final linked image.
+//
+// Note: Previously, the linker would transform some DWARF unwind infos into
+//       compact unwind info.  But that is fragile and no longer done.
+
+
+//
+// The compact unwind endoding is a 32-bit value which encoded in an
+// architecture specific way, which registers to restore from where, and how
+// to unwind out of the function.
+//
+typedef uint32_t compact_unwind_encoding_t;
+
+
+// architecture independent bits
+enum {
+    UNWIND_IS_NOT_FUNCTION_START           = 0x80000000,
+    UNWIND_HAS_LSDA                        = 0x40000000,
+    UNWIND_PERSONALITY_MASK                = 0x30000000,
+};
+
+
+
+
+//
+// x86
+//
+// 1-bit: start
+// 1-bit: has lsda
+// 2-bit: personality index
+//
+// 4-bits: 0=old, 1=ebp based, 2=stack-imm, 3=stack-ind, 4=DWARF
+//  ebp based:
+//        15-bits (5*3-bits per reg) register permutation
+//        8-bits for stack offset
+//  frameless:
+//        8-bits stack size
+//        3-bits stack adjust
+//        3-bits register count
+//        10-bits register permutation
+//
+enum {
+    UNWIND_X86_MODE_MASK                         = 0x0F000000,
+    UNWIND_X86_MODE_EBP_FRAME                    = 0x01000000,
+    UNWIND_X86_MODE_STACK_IMMD                   = 0x02000000,
+    UNWIND_X86_MODE_STACK_IND                    = 0x03000000,
+    UNWIND_X86_MODE_DWARF                        = 0x04000000,
+
+    UNWIND_X86_EBP_FRAME_REGISTERS               = 0x00007FFF,
+    UNWIND_X86_EBP_FRAME_OFFSET                  = 0x00FF0000,
+
+    UNWIND_X86_FRAMELESS_STACK_SIZE              = 0x00FF0000,
+    UNWIND_X86_FRAMELESS_STACK_ADJUST            = 0x0000E000,
+    UNWIND_X86_FRAMELESS_STACK_REG_COUNT         = 0x00001C00,
+    UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION   = 0x000003FF,
+
+    UNWIND_X86_DWARF_SECTION_OFFSET              = 0x00FFFFFF,
+};
+
+enum {
+    UNWIND_X86_REG_NONE     = 0,
+    UNWIND_X86_REG_EBX      = 1,
+    UNWIND_X86_REG_ECX      = 2,
+    UNWIND_X86_REG_EDX      = 3,
+    UNWIND_X86_REG_EDI      = 4,
+    UNWIND_X86_REG_ESI      = 5,
+    UNWIND_X86_REG_EBP      = 6,
+};
+
+//
+// For x86 there are four modes for the compact unwind encoding:
+// UNWIND_X86_MODE_EBP_FRAME:
+//    EBP based frame where EBP is push on stack immediately after return address,
+//    then ESP is moved to EBP. Thus, to unwind ESP is restored with the current
+//    EPB value, then EBP is restored by popping off the stack, and the return
+//    is done by popping the stack once more into the pc.
+//    All non-volatile registers that need to be restored must have been saved
+//    in a small range in the stack that starts EBP-4 to EBP-1020.  The offset/4
+//    is encoded in the UNWIND_X86_EBP_FRAME_OFFSET bits.  The registers saved
+//    are encoded in the UNWIND_X86_EBP_FRAME_REGISTERS bits as five 3-bit entries.
+//    Each entry contains which register to restore.
+// UNWIND_X86_MODE_STACK_IMMD:
+//    A "frameless" (EBP not used as frame pointer) function with a small 
+//    constant stack size.  To return, a constant (encoded in the compact
+//    unwind encoding) is added to the ESP. Then the return is done by
+//    popping the stack into the pc.
+//    All non-volatile registers that need to be restored must have been saved
+//    on the stack immediately after the return address.  The stack_size/4 is
+//    encoded in the UNWIND_X86_FRAMELESS_STACK_SIZE (max stack size is 1024).
+//    The number of registers saved is encoded in UNWIND_X86_FRAMELESS_STACK_REG_COUNT.
+//    UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION constains which registers were
+//    saved and their order.
+// UNWIND_X86_MODE_STACK_IND:
+//    A "frameless" (EBP not used as frame pointer) function large constant 
+//    stack size.  This case is like the previous, except the stack size is too
+//    large to encode in the compact unwind encoding.  Instead it requires that 
+//    the function contains "subl $nnnnnnnn,ESP" in its prolog.  The compact 
+//    encoding contains the offset to the nnnnnnnn value in the function in
+//    UNWIND_X86_FRAMELESS_STACK_SIZE.  
+// UNWIND_X86_MODE_DWARF:
+//    No compact unwind encoding is available.  Instead the low 24-bits of the
+//    compact encoding is the offset of the DWARF FDE in the __eh_frame section.
+//    This mode is never used in object files.  It is only generated by the 
+//    linker in final linked images which have only DWARF unwind info for a
+//    function.
+//
+// The permutation encoding is a Lehmer code sequence encoded into a
+// single variable-base number so we can encode the ordering of up to
+// six registers in a 10-bit space.
+//
+// The following is the algorithm used to create the permutation encoding used
+// with frameless stacks.  It is passed the number of registers to be saved and
+// an array of the register numbers saved.
+//
+//uint32_t permute_encode(uint32_t registerCount, const uint32_t registers[6])
+//{
+//    uint32_t renumregs[6];
+//    for (int i=6-registerCount; i < 6; ++i) {
+//        int countless = 0;
+//        for (int j=6-registerCount; j < i; ++j) {
+//            if ( registers[j] < registers[i] )
+//                ++countless;
+//        }
+//        renumregs[i] = registers[i] - countless -1;
+//    }
+//    uint32_t permutationEncoding = 0;
+//    switch ( registerCount ) {
+//        case 6:
+//            permutationEncoding |= (120*renumregs[0] + 24*renumregs[1]
+//                                    + 6*renumregs[2] + 2*renumregs[3]
+//                                      + renumregs[4]);
+//            break;
+//        case 5:
+//            permutationEncoding |= (120*renumregs[1] + 24*renumregs[2]
+//                                    + 6*renumregs[3] + 2*renumregs[4]
+//                                      + renumregs[5]);
+//            break;
+//        case 4:
+//            permutationEncoding |= (60*renumregs[2] + 12*renumregs[3]
+//                                   + 3*renumregs[4] + renumregs[5]);
+//            break;
+//        case 3:
+//            permutationEncoding |= (20*renumregs[3] + 4*renumregs[4]
+//                                     + renumregs[5]);
+//            break;
+//        case 2:
+//            permutationEncoding |= (5*renumregs[4] + renumregs[5]);
+//            break;
+//        case 1:
+//            permutationEncoding |= (renumregs[5]);
+//            break;
+//    }
+//    return permutationEncoding;
+//}
+//
+
+
+
+
+//
+// x86_64
+//
+// 1-bit: start
+// 1-bit: has lsda
+// 2-bit: personality index
+//
+// 4-bits: 0=old, 1=rbp based, 2=stack-imm, 3=stack-ind, 4=DWARF
+//  rbp based:
+//        15-bits (5*3-bits per reg) register permutation
+//        8-bits for stack offset
+//  frameless:
+//        8-bits stack size
+//        3-bits stack adjust
+//        3-bits register count
+//        10-bits register permutation
+//
+enum {
+    UNWIND_X86_64_MODE_MASK                         = 0x0F000000,
+    UNWIND_X86_64_MODE_RBP_FRAME                    = 0x01000000,
+    UNWIND_X86_64_MODE_STACK_IMMD                   = 0x02000000,
+    UNWIND_X86_64_MODE_STACK_IND                    = 0x03000000,
+    UNWIND_X86_64_MODE_DWARF                        = 0x04000000,
+
+    UNWIND_X86_64_RBP_FRAME_REGISTERS               = 0x00007FFF,
+    UNWIND_X86_64_RBP_FRAME_OFFSET                  = 0x00FF0000,
+
+    UNWIND_X86_64_FRAMELESS_STACK_SIZE              = 0x00FF0000,
+    UNWIND_X86_64_FRAMELESS_STACK_ADJUST            = 0x0000E000,
+    UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT         = 0x00001C00,
+    UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION   = 0x000003FF,
+
+    UNWIND_X86_64_DWARF_SECTION_OFFSET              = 0x00FFFFFF,
+};
+
+enum {
+    UNWIND_X86_64_REG_NONE       = 0,
+    UNWIND_X86_64_REG_RBX        = 1,
+    UNWIND_X86_64_REG_R12        = 2,
+    UNWIND_X86_64_REG_R13        = 3,
+    UNWIND_X86_64_REG_R14        = 4,
+    UNWIND_X86_64_REG_R15        = 5,
+    UNWIND_X86_64_REG_RBP        = 6,
+};
+//
+// For x86_64 there are four modes for the compact unwind encoding:
+// UNWIND_X86_64_MODE_RBP_FRAME:
+//    RBP based frame where RBP is push on stack immediately after return address,
+//    then RSP is moved to RBP. Thus, to unwind RSP is restored with the current 
+//    EPB value, then RBP is restored by popping off the stack, and the return 
+//    is done by popping the stack once more into the pc.
+//    All non-volatile registers that need to be restored must have been saved
+//    in a small range in the stack that starts RBP-8 to RBP-2040.  The offset/8 
+//    is encoded in the UNWIND_X86_64_RBP_FRAME_OFFSET bits.  The registers saved
+//    are encoded in the UNWIND_X86_64_RBP_FRAME_REGISTERS bits as five 3-bit entries.
+//    Each entry contains which register to restore.  
+// UNWIND_X86_64_MODE_STACK_IMMD:
+//    A "frameless" (RBP not used as frame pointer) function with a small 
+//    constant stack size.  To return, a constant (encoded in the compact 
+//    unwind encoding) is added to the RSP. Then the return is done by 
+//    popping the stack into the pc.
+//    All non-volatile registers that need to be restored must have been saved
+//    on the stack immediately after the return address.  The stack_size/8 is
+//    encoded in the UNWIND_X86_64_FRAMELESS_STACK_SIZE (max stack size is 2048).
+//    The number of registers saved is encoded in UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT.
+//    UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION constains which registers were
+//    saved and their order.  
+// UNWIND_X86_64_MODE_STACK_IND:
+//    A "frameless" (RBP not used as frame pointer) function large constant 
+//    stack size.  This case is like the previous, except the stack size is too
+//    large to encode in the compact unwind encoding.  Instead it requires that 
+//    the function contains "subq $nnnnnnnn,RSP" in its prolog.  The compact 
+//    encoding contains the offset to the nnnnnnnn value in the function in
+//    UNWIND_X86_64_FRAMELESS_STACK_SIZE.  
+// UNWIND_X86_64_MODE_DWARF:
+//    No compact unwind encoding is available.  Instead the low 24-bits of the
+//    compact encoding is the offset of the DWARF FDE in the __eh_frame section.
+//    This mode is never used in object files.  It is only generated by the 
+//    linker in final linked images which have only DWARF unwind info for a
+//    function.
+//
+
+
+// ARM64
+//
+// 1-bit: start
+// 1-bit: has lsda
+// 2-bit: personality index
+//
+// 4-bits: 4=frame-based, 3=DWARF, 2=frameless
+//  frameless:
+//        12-bits of stack size
+//  frame-based:
+//        4-bits D reg pairs saved
+//        5-bits X reg pairs saved
+//  DWARF:
+//        24-bits offset of DWARF FDE in __eh_frame section
+//
+enum {
+    UNWIND_ARM64_MODE_MASK                     = 0x0F000000,
+    UNWIND_ARM64_MODE_FRAMELESS                = 0x02000000,
+    UNWIND_ARM64_MODE_DWARF                    = 0x03000000,
+    UNWIND_ARM64_MODE_FRAME                    = 0x04000000,
+
+    UNWIND_ARM64_FRAME_X19_X20_PAIR            = 0x00000001,
+    UNWIND_ARM64_FRAME_X21_X22_PAIR            = 0x00000002,
+    UNWIND_ARM64_FRAME_X23_X24_PAIR            = 0x00000004,
+    UNWIND_ARM64_FRAME_X25_X26_PAIR            = 0x00000008,
+    UNWIND_ARM64_FRAME_X27_X28_PAIR            = 0x00000010,
+    UNWIND_ARM64_FRAME_D8_D9_PAIR              = 0x00000100,
+    UNWIND_ARM64_FRAME_D10_D11_PAIR            = 0x00000200,
+    UNWIND_ARM64_FRAME_D12_D13_PAIR            = 0x00000400,
+    UNWIND_ARM64_FRAME_D14_D15_PAIR            = 0x00000800,
+
+    UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK     = 0x00FFF000,
+    UNWIND_ARM64_DWARF_SECTION_OFFSET          = 0x00FFFFFF,
+};
+// For arm64 there are three modes for the compact unwind encoding:
+// UNWIND_ARM64_MODE_FRAME:
+//    This is a standard arm64 prolog where FP/LR are immediately pushed on the
+//    stack, then SP is copied to FP. If there are any non-volatile registers
+//    saved, then are copied into the stack frame in pairs in a contiguous
+//    range right below the saved FP/LR pair.  Any subset of the five X pairs 
+//    and four D pairs can be saved, but the memory layout must be in register
+//    number order.  
+// UNWIND_ARM64_MODE_FRAMELESS:
+//    A "frameless" leaf function, where FP/LR are not saved. The return address 
+//    remains in LR throughout the function. If any non-volatile registers
+//    are saved, they must be pushed onto the stack before any stack space is
+//    allocated for local variables.  The stack sized (including any saved
+//    non-volatile registers) divided by 16 is encoded in the bits 
+//    UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK.
+// UNWIND_ARM64_MODE_DWARF:
+//    No compact unwind encoding is available.  Instead the low 24-bits of the
+//    compact encoding is the offset of the DWARF FDE in the __eh_frame section.
+//    This mode is never used in object files.  It is only generated by the 
+//    linker in final linked images which have only DWARF unwind info for a
+//    function.
+//
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+//
+//  Relocatable Object Files: __LD,__compact_unwind
+//
+////////////////////////////////////////////////////////////////////////////////
+
+//
+// A compiler can generated compact unwind information for a function by adding
+// a "row" to the __LD,__compact_unwind section.  This section has the 
+// S_ATTR_DEBUG bit set, so the section will be ignored by older linkers. 
+// It is removed by the new linker, so never ends up in final executables. 
+// This section is a table, initially with one row per function (that needs 
+// unwind info).  The table columns and some conceptual entries are:
+//
+//     range-start               pointer to start of function/range
+//     range-length              
+//     compact-unwind-encoding   32-bit encoding  
+//     personality-function      or zero if no personality function
+//     lsda                      or zero if no LSDA data
+//
+// The length and encoding fields are 32-bits.  The other are all pointer sized. 
+//
+// In x86_64 assembly, these entry would look like:
+//
+//     .section __LD,__compact_unwind,regular,debug
+//
+//     #compact unwind for _foo
+//     .quad    _foo
+//     .set     L1,LfooEnd-_foo
+//     .long    L1
+//     .long    0x01010001
+//     .quad    0
+//     .quad    0
+//
+//     #compact unwind for _bar
+//     .quad    _bar
+//     .set     L2,LbarEnd-_bar
+//     .long    L2
+//     .long    0x01020011
+//     .quad    __gxx_personality
+//     .quad    except_tab1
+//
+//
+// Notes: There is no need for any labels in the the __compact_unwind section.  
+//        The use of the .set directive is to force the evaluation of the 
+//        range-length at assembly time, instead of generating relocations.
+//
+// To support future compiler optimizations where which non-volatile registers 
+// are saved changes within a function (e.g. delay saving non-volatiles until
+// necessary), there can by multiple lines in the __compact_unwind table for one
+// function, each with a different (non-overlapping) range and each with 
+// different compact unwind encodings that correspond to the non-volatiles 
+// saved at that range of the function.
+//
+// If a particular function is so wacky that there is no compact unwind way
+// to encode it, then the compiler can emit traditional DWARF unwind info.  
+// The runtime will use which ever is available.
+//
+// Runtime support for compact unwind encodings are only available on 10.6 
+// and later.  So, the compiler should not generate it when targeting pre-10.6. 
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+//
+//  Final Linked Images: __TEXT,__unwind_info
+//
+////////////////////////////////////////////////////////////////////////////////
+
+//
+// The __TEXT,__unwind_info section is laid out for an efficient two level lookup.
+// The header of the section contains a coarse index that maps function address
+// to the page (4096 byte block) containing the unwind info for that function.  
+//
+
+#define UNWIND_SECTION_VERSION 1
+struct unwind_info_section_header
+{
+    uint32_t    version;            // UNWIND_SECTION_VERSION
+    uint32_t    commonEncodingsArraySectionOffset;
+    uint32_t    commonEncodingsArrayCount;
+    uint32_t    personalityArraySectionOffset;
+    uint32_t    personalityArrayCount;
+    uint32_t    indexSectionOffset;
+    uint32_t    indexCount;
+    // compact_unwind_encoding_t[]
+    // uint32_t personalities[]
+    // unwind_info_section_header_index_entry[]
+    // unwind_info_section_header_lsda_index_entry[]
+};
+
+struct unwind_info_section_header_index_entry
+{
+    uint32_t        functionOffset;
+    uint32_t        secondLevelPagesSectionOffset;  // section offset to start of regular or compress page
+    uint32_t        lsdaIndexArraySectionOffset;    // section offset to start of lsda_index array for this range
+};
+
+struct unwind_info_section_header_lsda_index_entry
+{
+    uint32_t        functionOffset;
+    uint32_t        lsdaOffset;
+};
+
+//
+// There are two kinds of second level index pages: regular and compressed.
+// A compressed page can hold up to 1021 entries, but it cannot be used
+// if too many different encoding types are used.  The regular page holds
+// 511 entries.
+//
+
+struct unwind_info_regular_second_level_entry
+{
+    uint32_t                    functionOffset;
+    compact_unwind_encoding_t    encoding;
+};
+
+#define UNWIND_SECOND_LEVEL_REGULAR 2
+struct unwind_info_regular_second_level_page_header
+{
+    uint32_t    kind;    // UNWIND_SECOND_LEVEL_REGULAR
+    uint16_t    entryPageOffset;
+    uint16_t    entryCount;
+    // entry array
+};
+
+#define UNWIND_SECOND_LEVEL_COMPRESSED 3
+struct unwind_info_compressed_second_level_page_header
+{
+    uint32_t    kind;    // UNWIND_SECOND_LEVEL_COMPRESSED
+    uint16_t    entryPageOffset;
+    uint16_t    entryCount;
+    uint16_t    encodingsPageOffset;
+    uint16_t    encodingsCount;
+    // 32-bit entry array
+    // encodings array
+};
+
+#define UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(entry)            (entry & 0x00FFFFFF)
+#define UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(entry)        ((entry >> 24) & 0xFF)
+
+
+
+#endif
+
diff --git a/lib/libunwind/include/unwind.h b/lib/libunwind/include/unwind.h
new file mode 100644
index 0000000000..ae8ae5d24e
--- /dev/null
+++ b/lib/libunwind/include/unwind.h
@@ -0,0 +1,401 @@
+//===------------------------------- unwind.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.
+//
+//
+// C++ ABI Level 1 ABI documented at:
+//   http://mentorembedded.github.io/cxx-abi/abi-eh.html
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __UNWIND_H__
+#define __UNWIND_H__
+
+#include <__libunwind_config.h>
+
+#include <stdint.h>
+#include <stddef.h>
+
+#if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__) && defined(_WIN32)
+#include <windows.h>
+#include <ntverp.h>
+#endif
+
+#if defined(__APPLE__)
+#define LIBUNWIND_UNAVAIL __attribute__ (( unavailable ))
+#else
+#define LIBUNWIND_UNAVAIL
+#endif
+
+typedef enum {
+  _URC_NO_REASON = 0,
+  _URC_OK = 0,
+  _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 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 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;
+
+typedef uint32_t _Unwind_EHT_Header;
+
+struct _Unwind_Control_Block;
+typedef struct _Unwind_Control_Block _Unwind_Control_Block;
+typedef struct _Unwind_Control_Block _Unwind_Exception; /* Alias */
+
+struct _Unwind_Control_Block {
+  uint64_t exception_class;
+  void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block*);
+
+  /* Unwinder cache, private fields for the unwinder's use */
+  struct {
+    uint32_t reserved1; /* init reserved1 to 0, then don't touch */
+    uint32_t reserved2;
+    uint32_t reserved3;
+    uint32_t reserved4;
+    uint32_t reserved5;
+  } unwinder_cache;
+
+  /* Propagation barrier cache (valid after phase 1): */
+  struct {
+    uint32_t sp;
+    uint32_t bitpattern[5];
+  } barrier_cache;
+
+  /* Cleanup cache (preserved over cleanup): */
+  struct {
+    uint32_t bitpattern[4];
+  } cleanup_cache;
+
+  /* Pr cache (for pr's benefit): */
+  struct {
+    uint32_t fnstart; /* function start address */
+    _Unwind_EHT_Header* ehtp; /* pointer to EHT entry header word */
+    uint32_t additional;
+    uint32_t reserved1;
+  } pr_cache;
+
+  long long int :0; /* Enforce the 8-byte alignment */
+} __attribute__((__aligned__(8)));
+
+typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
+      (_Unwind_State state,
+       _Unwind_Exception* exceptionObject,
+       struct _Unwind_Context* context);
+
+typedef _Unwind_Reason_Code (*__personality_routine)
+      (_Unwind_State state,
+       _Unwind_Exception* exceptionObject,
+       struct _Unwind_Context* context);
+#else
+struct _Unwind_Context;   // opaque
+struct _Unwind_Exception; // forward declaration
+typedef struct _Unwind_Exception _Unwind_Exception;
+
+struct _Unwind_Exception {
+  uint64_t exception_class;
+  void (*exception_cleanup)(_Unwind_Reason_Code reason,
+                            _Unwind_Exception *exc);
+#if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
+  uintptr_t private_[6];
+#else
+  uintptr_t private_1; // non-zero means forced unwind
+  uintptr_t private_2; // holds sp that phase1 found for phase2 to use
+#endif
+#if __SIZEOF_POINTER__ == 4
+  // The implementation of _Unwind_Exception uses an attribute mode on the
+  // above fields which has the side effect of causing this whole struct to
+  // round up to 32 bytes in size (48 with SEH). To be more explicit, we add
+  // pad fields added for binary compatibility.
+  uint32_t reserved[3];
+#endif
+  // The Itanium ABI requires that _Unwind_Exception objects are "double-word
+  // aligned".  GCC has interpreted this to mean "use the maximum useful
+  // alignment for the target"; so do we.
+} __attribute__((__aligned__));
+
+typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
+    (int version,
+     _Unwind_Action actions,
+     uint64_t exceptionClass,
+     _Unwind_Exception* exceptionObject,
+     struct _Unwind_Context* context,
+     void* stop_parameter );
+
+typedef _Unwind_Reason_Code (*__personality_routine)
+      (int version,
+       _Unwind_Action actions,
+       uint64_t exceptionClass,
+       _Unwind_Exception* exceptionObject,
+       struct _Unwind_Context* context);
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//
+// The following are the base functions documented by the C++ ABI
+//
+#ifdef __USING_SJLJ_EXCEPTIONS__
+extern _Unwind_Reason_Code
+    _Unwind_SjLj_RaiseException(_Unwind_Exception *exception_object);
+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 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 {
+  _UVRSD_UINT32 = 0,
+  _UVRSD_VFPX = 1,
+  _UVRSD_UINT64 = 3,
+  _UVRSD_FLOAT = 4,
+  _UVRSD_DOUBLE = 5
+} _Unwind_VRS_DataRepresentation;
+
+typedef enum {
+  _UVRSR_OK = 0,
+  _UVRSR_NOT_IMPLEMENTED = 1,
+  _UVRSR_FAILED = 2
+} _Unwind_VRS_Result;
+
+extern void _Unwind_Complete(_Unwind_Exception* exception_object);
+
+extern _Unwind_VRS_Result
+_Unwind_VRS_Get(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
+                uint32_t regno, _Unwind_VRS_DataRepresentation representation,
+                void *valuep);
+
+extern _Unwind_VRS_Result
+_Unwind_VRS_Set(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
+                uint32_t regno, _Unwind_VRS_DataRepresentation representation,
+                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 !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  // 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
+// calls to _Unwind_VRS_Get/Set().  These are not a part of ARM EHABI
+// specification, thus these function MUST be inlined.  Please don't replace
+// these with the "extern" function declaration; otherwise, the program
+// including this <unwind.h> header won't be ABI compatible and will result in
+// link error when we are linking the program with libgcc.
+
+_LIBUNWIND_EXPORT_UNWIND_LEVEL1
+uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, int index) {
+  uintptr_t value = 0;
+  _Unwind_VRS_Get(context, _UVRSC_CORE, (uint32_t)index, _UVRSD_UINT32, &value);
+  return value;
+}
+
+_LIBUNWIND_EXPORT_UNWIND_LEVEL1
+void _Unwind_SetGR(struct _Unwind_Context *context, int index,
+                   uintptr_t value) {
+  _Unwind_VRS_Set(context, _UVRSC_CORE, (uint32_t)index, _UVRSD_UINT32, &value);
+}
+
+_LIBUNWIND_EXPORT_UNWIND_LEVEL1
+uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
+  // remove the thumb-bit before returning
+  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  // 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);
+#else
+extern _Unwind_Reason_Code
+    _Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
+                         _Unwind_Stop_Fn stop, void *stop_parameter);
+#endif
+
+#ifdef __USING_SJLJ_EXCEPTIONS__
+typedef struct _Unwind_FunctionContext *_Unwind_FunctionContext_t;
+extern void _Unwind_SjLj_Register(_Unwind_FunctionContext_t fc);
+extern void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t fc);
+#endif
+
+//
+// The following are semi-suppoted extensions to the C++ ABI
+//
+
+//
+//  called by __cxa_rethrow().
+//
+#ifdef __USING_SJLJ_EXCEPTIONS__
+extern _Unwind_Reason_Code
+    _Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *exception_object);
+#else
+extern _Unwind_Reason_Code
+    _Unwind_Resume_or_Rethrow(_Unwind_Exception *exception_object);
+#endif
+
+// _Unwind_Backtrace() is a gcc extension that walks the stack and calls the
+// _Unwind_Trace_Fn once per frame until it reaches the bottom of the stack
+// or the _Unwind_Trace_Fn function returns something other than _URC_NO_REASON.
+typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *,
+                                                void *);
+extern _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *);
+
+// _Unwind_GetCFA is a gcc extension that can be called from within a
+// personality handler to get the CFA (stack pointer before call) of
+// current frame.
+extern uintptr_t _Unwind_GetCFA(struct _Unwind_Context *);
+
+
+// _Unwind_GetIPInfo is a gcc extension that can be called from within a
+// personality handler.  Similar to _Unwind_GetIP() but also returns in
+// *ipBefore a non-zero value if the instruction pointer is at or before the
+// instruction causing the unwind. Normally, in a function call, the IP returned
+// is the return address which is after the call instruction and may be past the
+// end of the function containing the call instruction.
+extern uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context,
+                                   int *ipBefore);
+
+
+// __register_frame() is used with dynamically generated code to register the
+// FDE for a generated (JIT) code.  The FDE must use pc-rel addressing to point
+// to its function and optional LSDA.
+// __register_frame() has existed in all versions of Mac OS X, but in 10.4 and
+// 10.5 it was buggy and did not actually register the FDE with the unwinder.
+// In 10.6 and later it does register properly.
+extern void __register_frame(const void *fde);
+extern void __deregister_frame(const void *fde);
+
+// _Unwind_Find_FDE() will locate the FDE if the pc is in some function that has
+// an associated FDE. Note, Mac OS X 10.6 and later, introduces "compact unwind
+// info" which the runtime uses in preference to DWARF unwind info.  This
+// function will only work if the target function has an FDE but no compact
+// unwind info.
+struct dwarf_eh_bases {
+  uintptr_t tbase;
+  uintptr_t dbase;
+  uintptr_t func;
+};
+extern const void *_Unwind_Find_FDE(const void *pc, struct dwarf_eh_bases *);
+
+
+// This function attempts to find the start (address of first instruction) of
+// a function given an address inside the function.  It only works if the
+// function has an FDE (DWARF unwind info).
+// This function is unimplemented on Mac OS X 10.6 and later.  Instead, use
+// _Unwind_Find_FDE() and look at the dwarf_eh_bases.func result.
+extern void *_Unwind_FindEnclosingFunction(void *pc);
+
+// Mac OS X does not support text-rel and data-rel addressing so these functions
+// are unimplemented
+extern uintptr_t _Unwind_GetDataRelBase(struct _Unwind_Context *context)
+    LIBUNWIND_UNAVAIL;
+extern uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context *context)
+    LIBUNWIND_UNAVAIL;
+
+// Mac OS X 10.4 and 10.5 had implementations of these functions in
+// libgcc_s.dylib, but they never worked.
+/// These functions are no longer available on Mac OS X.
+extern void __register_frame_info_bases(const void *fde, void *ob, void *tb,
+                                        void *db) LIBUNWIND_UNAVAIL;
+extern void __register_frame_info(const void *fde, void *ob)
+    LIBUNWIND_UNAVAIL;
+extern void __register_frame_info_table_bases(const void *fde, void *ob,
+                                              void *tb, void *db)
+    LIBUNWIND_UNAVAIL;
+extern void __register_frame_info_table(const void *fde, void *ob)
+    LIBUNWIND_UNAVAIL;
+extern void __register_frame_table(const void *fde)
+    LIBUNWIND_UNAVAIL;
+extern void *__deregister_frame_info(const void *fde)
+    LIBUNWIND_UNAVAIL;
+extern void *__deregister_frame_info_bases(const void *fde)
+    LIBUNWIND_UNAVAIL;
+
+#if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
+#ifndef _WIN32
+typedef struct _EXCEPTION_RECORD EXCEPTION_RECORD;
+typedef struct _CONTEXT CONTEXT;
+typedef struct _DISPATCHER_CONTEXT DISPATCHER_CONTEXT;
+#elif !defined(__MINGW32__) && VER_PRODUCTBUILD < 8000
+typedef struct _DISPATCHER_CONTEXT DISPATCHER_CONTEXT;
+#endif
+// This is the common wrapper for GCC-style personality functions with SEH.
+extern EXCEPTION_DISPOSITION _GCC_specific_handler(EXCEPTION_RECORD *exc,
+                                                   void *frame,
+                                                   CONTEXT *ctx,
+                                                   DISPATCHER_CONTEXT *disp,
+                                                   __personality_routine pers);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __UNWIND_H__