[libunwind] Partially revert r297174 to fix build on at least FreeBSD.

The changes in r297174 moved the #include of <link.h> on FreeBSD (and
probably other systems) inside of the open 'libunwind' namespace
causing various system-provided types such as pid_t to be declared in
this namespace rather than the global namespace.  Fix this by moving
the relevant declarations before the 'libunwind' namespace is opened,
but still using the cleaned up declarations from r297174.

Reviewed By: ed, compnerd

Differential Revision: https://reviews.llvm.org/D38108

llvm-svn: 313920

1 files changed, 69 insertions, 69 deletions

diff --git a/libunwind/src/AddressSpace.hpp b/libunwind/src/AddressSpace.hpp
index 2ed52a5583c..e31ad826fe4 100644
--- a/libunwind/src/AddressSpace.hpp
+++ b/libunwind/src/AddressSpace.hpp
@@ -35,6 +35,75 @@ namespace libunwind {
 #include "EHHeaderParser.hpp"
 #include "Registers.hpp"
 
+#ifdef __APPLE__
+
+  struct dyld_unwind_sections
+  {
+    const struct mach_header*   mh;
+    const void*                 dwarf_section;
+    uintptr_t                   dwarf_section_length;
+    const void*                 compact_unwind_section;
+    uintptr_t                   compact_unwind_section_length;
+  };
+  #if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) \
+                                 && (__MAC_OS_X_VERSION_MIN_REQUIRED >= 1070)) \
+      || defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+    // In 10.7.0 or later, libSystem.dylib implements this function.
+    extern "C" bool _dyld_find_unwind_sections(void *, dyld_unwind_sections *);
+  #else
+    // In 10.6.x and earlier, we need to implement this functionality. Note
+    // that this requires a newer version of libmacho (from cctools) than is
+    // present in libSystem on 10.6.x (for getsectiondata).
+    static inline bool _dyld_find_unwind_sections(void* addr,
+                                                    dyld_unwind_sections* info) {
+      // Find mach-o image containing address.
+      Dl_info dlinfo;
+      if (!dladdr(addr, &dlinfo))
+        return false;
+#if __LP64__
+      const struct mach_header_64 *mh = (const struct mach_header_64 *)dlinfo.dli_fbase;
+#else
+      const struct mach_header *mh = (const struct mach_header *)dlinfo.dli_fbase;
+#endif
+
+      // Initialize the return struct
+      info->mh = (const struct mach_header *)mh;
+      info->dwarf_section = getsectiondata(mh, "__TEXT", "__eh_frame", &info->dwarf_section_length);
+      info->compact_unwind_section = getsectiondata(mh, "__TEXT", "__unwind_info", &info->compact_unwind_section_length);
+
+      if (!info->dwarf_section) {
+        info->dwarf_section_length = 0;
+      }
+
+      if (!info->compact_unwind_section) {
+        info->compact_unwind_section_length = 0;
+      }
+
+      return true;
+    }
+  #endif
+
+#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 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
+
 namespace libunwind {
 
 /// Used by findUnwindSections() to return info about needed sections.
@@ -265,75 +334,6 @@ LocalAddressSpace::getEncodedP(pint_t &addr, pint_t end, uint8_t encoding,
   return result;
 }
 
-#ifdef __APPLE__
-
-  struct dyld_unwind_sections
-  {
-    const struct mach_header*   mh;
-    const void*                 dwarf_section;
-    uintptr_t                   dwarf_section_length;
-    const void*                 compact_unwind_section;
-    uintptr_t                   compact_unwind_section_length;
-  };
-  #if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) \
-                                 && (__MAC_OS_X_VERSION_MIN_REQUIRED >= 1070)) \
-      || defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
-    // In 10.7.0 or later, libSystem.dylib implements this function.
-    extern "C" bool _dyld_find_unwind_sections(void *, dyld_unwind_sections *);
-  #else
-    // In 10.6.x and earlier, we need to implement this functionality. Note
-    // that this requires a newer version of libmacho (from cctools) than is
-    // present in libSystem on 10.6.x (for getsectiondata).
-    static inline bool _dyld_find_unwind_sections(void* addr,
-                                                    dyld_unwind_sections* info) {
-      // Find mach-o image containing address.
-      Dl_info dlinfo;
-      if (!dladdr(addr, &dlinfo))
-        return false;
-#if __LP64__
-      const struct mach_header_64 *mh = (const struct mach_header_64 *)dlinfo.dli_fbase;
-#else
-      const struct mach_header *mh = (const struct mach_header *)dlinfo.dli_fbase;
-#endif
-
-      // Initialize the return struct
-      info->mh = (const struct mach_header *)mh;
-      info->dwarf_section = getsectiondata(mh, "__TEXT", "__eh_frame", &info->dwarf_section_length);
-      info->compact_unwind_section = getsectiondata(mh, "__TEXT", "__unwind_info", &info->compact_unwind_section_length);
-
-      if (!info->dwarf_section) {
-        info->dwarf_section_length = 0;
-      }
-
-      if (!info->compact_unwind_section) {
-        info->compact_unwind_section_length = 0;
-      }
-
-      return true;
-    }
-  #endif
-
-#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 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__