1 //===- SearchForAddressOfSpecialSymbol.cpp - Function addresses -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file pulls the addresses of certain symbols out of the linker. It must
11 // include as few header files as possible because it declares the symbols as
12 // void*, which would conflict with the actual symbol type if any header
15 //===----------------------------------------------------------------------===//
19 // Must declare the symbols in the global namespace.
20 static void *DoSearch(const char* symbolName) {
21 #define EXPLICIT_SYMBOL(SYM) \
22 extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM
24 // If this is darwin, it has some funky issues, try to solve them here. Some
25 // important symbols are marked 'private external' which doesn't allow
26 // SearchForAddressOfSymbol to find them. As such, we special case them here,
27 // there is only a small handful of them.
31 // __eprintf is sometimes used for assert() handling on x86.
33 // FIXME: Currently disabled when using Clang, as we don't always have our
34 // runtime support libraries available.
37 EXPLICIT_SYMBOL(__eprintf);
45 EXPLICIT_SYMBOL(_alloca);
46 EXPLICIT_SYMBOL(__main);
50 #undef EXPLICIT_SYMBOL
55 void *SearchForAddressOfSpecialSymbol(const char* symbolName) {
56 return DoSearch(symbolName);