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https://github.com/c64scene-ar/llvm-6502.git
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63dea2c952
This commit adds a new pass that can inject checks before indirect calls to make sure that these calls target known locations. It supports three types of checks and, at compile time, it can take the name of a custom function to call when an indirect call check fails. The default failure function ignores the error and continues. This pass incidentally moves the function JumpInstrTables::transformType from private to public and makes it static (with a new argument that specifies the table type to use); this is so that the CFI code can transform function types at call sites to determine which jump-instruction table to use for the check at that site. Also, this removes support for jumptables in ARM, pending further performance analysis and discussion. Review: http://reviews.llvm.org/D4167 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221708 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
2.5 KiB
C++
73 lines
2.5 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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/// The default byte alignment for jump tables is 16, which is large but
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/// usually safe.
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JumpInstrTableInfo(uint64_t ByteAlign = 16);
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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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/// Gets the alignment in bytes of a jumptable entry.
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uint64_t entryByteAlignment() const { return ByteAlignment; }
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private:
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JumpTables Tables;
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/// A power-of-two alignment of a jumptable entry.
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uint64_t ByteAlignment;
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};
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/// Creates a JumpInstrTableInfo pass with the given bound on entry size. This
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/// bound specifies the maximum number of bytes needed to represent an
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/// unconditional jump or a trap instruction in the back end currently in use.
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ModulePass *createJumpInstrTableInfoPass(unsigned Bound);
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}
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#endif /* LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H */
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