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It includes a pass that rewrites all indirect calls to jumptable functions to pass through these tables. This also adds backend support for generating the jump-instruction tables on ARM and X86. Note that since the jumptable attribute creates a second function pointer for a function, any function marked with jumptable must also be marked with unnamed_addr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210280 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
//===-- JumpInstrTableInfo.h: Info for Jump-Instruction Tables --*- C++ -*-===//
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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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/// \file
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/// \brief Information about jump-instruction tables that have been created by
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/// JumpInstrTables pass.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H
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#define LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Pass.h"
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#include <vector>
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namespace llvm {
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class Function;
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class FunctionType;
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/// This class stores information about jump-instruction tables created by the
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/// JumpInstrTables pass (in lib/CodeGen/JumpInstrTables.cpp). Each table is a
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/// map from a function type to a vector of pairs. The first element of each
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/// pair is the function that has the jumptable annotation. The second element
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/// is a function that was declared by JumpInstrTables and used to replace all
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/// address-taking sites for the original function.
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///
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/// The information in this pass is used in AsmPrinter
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/// (lib/CodeGen/AsmPrinter/AsmPrinter.cpp) to generate the required assembly
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/// for the jump-instruction tables.
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class JumpInstrTableInfo : public ImmutablePass {
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public:
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static char ID;
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JumpInstrTableInfo();
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virtual ~JumpInstrTableInfo();
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const char *getPassName() const override {
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return "Jump-Instruction Table Info";
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}
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typedef std::pair<Function *, Function *> JumpPair;
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typedef DenseMap<FunctionType *, std::vector<JumpPair> > JumpTables;
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/// Inserts an entry in a table, adding the table if it doesn't exist.
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void insertEntry(FunctionType *TableFunTy, Function *Target, Function *Jump);
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/// Gets the tables.
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const JumpTables &getTables() const { return Tables; }
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private:
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JumpTables Tables;
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};
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}
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#endif /* LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H */
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