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The language reference says that: "If a symbol appears in the @llvm.used list, then the compiler, assembler, and linker are required to treat the symbol as if there is a reference to the symbol that it cannot see" Since even the linker cannot see the reference, we must assume that the reference can be using the symbol table. For example, a user can add __attribute__((used)) to a debug helper function like dump and use it from a debugger. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187103 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
1.6 KiB
C++
42 lines
1.6 KiB
C++
//===-- ModuleUtils.h - Functions to manipulate Modules ---------*- 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 family of functions perform manipulations on Modules.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_MODULEUTILS_H
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#define LLVM_TRANSFORMS_UTILS_MODULEUTILS_H
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namespace llvm {
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class Module;
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class Function;
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class GlobalValue;
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class GlobalVariable;
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template <class PtrType, unsigned SmallSize> class SmallPtrSet;
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/// Append F to the list of global ctors of module M with the given Priority.
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/// This wraps the function in the appropriate structure and stores it along
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/// side other global constructors. For details see
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/// http://llvm.org/docs/LangRef.html#intg_global_ctors
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void appendToGlobalCtors(Module &M, Function *F, int Priority);
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/// Same as appendToGlobalCtors(), but for global dtors.
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void appendToGlobalDtors(Module &M, Function *F, int Priority);
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/// \brief Given "llvm.used" or "llvm.compiler.used" as a global name, collect
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/// the initializer elements of that global in Set and return the global itself.
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GlobalVariable *collectUsedGlobalVariables(Module &M,
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SmallPtrSet<GlobalValue *, 8> &Set,
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bool CompilerUsed);
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} // End llvm namespace
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#endif // LLVM_TRANSFORMS_UTILS_MODULEUTILS_H
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