X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2Fexperimental%2Fsymbolizer%2FElf-inl.h;h=e643dd2fc3c72fbcc51a1ec5bc26548e014bc9af;hb=f975d3c54800b7065985e5e548ce1d91fef4926c;hp=4bc644d5c691670ca9466d2ca7e1d1f94c24421b;hpb=5c77fedbef46995a71ffa268c9fcaf49efddd01b;p=folly.git

diff --git a/folly/experimental/symbolizer/Elf-inl.h b/folly/experimental/symbolizer/Elf-inl.h
index 4bc644d5..e643dd2f 100644
--- a/folly/experimental/symbolizer/Elf-inl.h
+++ b/folly/experimental/symbolizer/Elf-inl.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -59,7 +59,34 @@ const char* ElfFile::iterateStrings(const ElfW(Shdr)& stringTable, Fn fn)
   return ptr != end ? ptr : nullptr;
 }
 
+template <class Fn>
+const ElfW(Sym)* ElfFile::iterateSymbols(const ElfW(Shdr)& section, Fn fn)
+  const {
+  FOLLY_SAFE_CHECK(section.sh_entsize == sizeof(ElfW(Sym)),
+                   "invalid entry size in symbol table");
+
+  const ElfW(Sym)* sym = &at<ElfW(Sym)>(section.sh_offset);
+  const ElfW(Sym)* end = sym + (section.sh_size / section.sh_entsize);
+
+  while (sym < end) {
+    if (fn(*sym)) {
+      return sym;
+    }
+
+    ++sym;
+  }
+
+  return nullptr;
+}
+
+template <class Fn>
+const ElfW(Sym)* ElfFile::iterateSymbolsWithType(const ElfW(Shdr)& section,
+                                                 uint32_t type, Fn fn) const {
+  // N.B. st_info has the same representation on 32- and 64-bit platforms
+  return iterateSymbols(section, [&](const ElfW(Sym)& sym) -> bool {
+    return ELF32_ST_TYPE(sym.st_info) == type && fn(sym);
+  });
+}
 
 }  // namespace symbolizer
 }  // namespace folly
-