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59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
//===- SearchForAddressOfSpecialSymbol.cpp - Function addresses -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file pulls the addresses of certain symbols out of the linker. It must
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// include as few header files as possible because it declares the symbols as
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// void*, which would conflict with the actual symbol type if any header
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// declared it.
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//
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//===----------------------------------------------------------------------===//
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#include <string.h>
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// Must declare the symbols in the global namespace.
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static void *DoSearch(const char* symbolName) {
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#define EXPLICIT_SYMBOL(SYM) \
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extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM
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// If this is darwin, it has some funky issues, try to solve them here. Some
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// important symbols are marked 'private external' which doesn't allow
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// SearchForAddressOfSymbol to find them. As such, we special case them here,
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// there is only a small handful of them.
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#ifdef __APPLE__
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{
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// __eprintf is sometimes used for assert() handling on x86.
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//
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// FIXME: Currently disabled when using Clang, as we don't always have our
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// runtime support libraries available.
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#ifndef __clang__
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#ifdef __i386__
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EXPLICIT_SYMBOL(__eprintf);
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#endif
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#endif
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}
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#endif
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#ifdef __CYGWIN__
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{
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EXPLICIT_SYMBOL(_alloca);
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EXPLICIT_SYMBOL(__main);
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}
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#endif
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#undef EXPLICIT_SYMBOL
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return nullptr;
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}
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namespace llvm {
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void *SearchForAddressOfSpecialSymbol(const char* symbolName) {
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return DoSearch(symbolName);
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}
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} // namespace llvm
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