[PATCH] D131792: [libunwind] Remove __ANDROID_API__ < 18 workaround

[Fangrui Song via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGb559777c308d: [libunwind] Remove __ANDROID_API__ < 18 workaround (authored by MaskRay).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D131792/new/

https://reviews.llvm.org/D131792

Files:
  libunwind/src/AddressSpace.hpp


Index: libunwind/src/AddressSpace.hpp
===================================================================
--- libunwind/src/AddressSpace.hpp
+++ libunwind/src/AddressSpace.hpp
@@ -373,28 +373,6 @@
   typedef ElfW(Addr) Elf_Addr;
 #endif
 
-static Elf_Addr calculateImageBase(struct dl_phdr_info *pinfo) {
-  Elf_Addr image_base = pinfo->dlpi_addr;
-#if defined(__ANDROID__) && __ANDROID_API__ < 18
-  if (image_base == 0) {
-    // Normally, an image base of 0 indicates a non-PIE executable. On
-    // versions of Android prior to API 18, the dynamic linker reported a
-    // dlpi_addr of 0 for PIE executables. Compute the true image base
-    // using the PT_PHDR segment.
-    // See https://github.com/android/ndk/issues/505.
-    for (Elf_Half i = 0; i < pinfo->dlpi_phnum; i++) {
-      const Elf_Phdr *phdr = &pinfo->dlpi_phdr[i];
-      if (phdr->p_type == PT_PHDR) {
-        image_base = reinterpret_cast<Elf_Addr>(pinfo->dlpi_phdr) -
-          phdr->p_vaddr;
-        break;
-      }
-    }
-  }
-#endif
-  return image_base;
-}
-
 struct _LIBUNWIND_HIDDEN dl_iterate_cb_data {
   LocalAddressSpace *addressSpace;
   UnwindInfoSections *sects;
@@ -468,7 +446,7 @@
   (void)pinfo_size;
 #endif
 
-  Elf_Addr image_base = calculateImageBase(pinfo);
+  Elf_Addr image_base = pinfo->dlpi_addr;
 
   // Most shared objects seen in this callback function likely don't contain the
   // target address, so optimize for that. Scan for a matching PT_LOAD segment


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