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7ed816f900
x86 and ppc for 100% dense switch statements when relocations are non-PIC. This support will be extended and enhanced in the coming days to support PIC, and less dense forms of jump tables. llvm-svn: 27947
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===-- CodeGen/MachineJumpTableInfo.h - Abstract Jump Tables --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Nate Begeman and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// The MachineJumpTableInfo class keeps track of jump tables referenced by
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// lowered switch instructions in the MachineFunction.
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//
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// Instructions reference the address of these jump tables through the use of
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// MO_JumpTableIndex values. When emitting assembly or machine code, these
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// virtual address references are converted to refer to the address of the
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// function jump tables.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEJUMPTABLEINFO_H
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#define LLVM_CODEGEN_MACHINEJUMPTABLEINFO_H
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#include "llvm/Target/TargetData.h"
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#include <vector>
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#include <iosfwd>
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namespace llvm {
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class MachineBasicBlock;
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/// MachineJumpTableEntry - One jump table in the jump table info.
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///
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struct MachineJumpTableEntry {
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/// MBBs - The vector of basic blocks from which to create the jump table.
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std::vector<MachineBasicBlock*> MBBs;
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MachineJumpTableEntry(std::vector<MachineBasicBlock*> &M) : MBBs(M) {}
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};
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class MachineJumpTableInfo {
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const TargetData &TD;
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std::vector<MachineJumpTableEntry> JumpTables;
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public:
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MachineJumpTableInfo(const TargetData &td) : TD(td) {}
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/// getJumpTableIndex - Create a new jump table or return an existing one.
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///
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unsigned getJumpTableIndex(std::vector<MachineBasicBlock*> &DestBBs);
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/// isEmpty - Return true if there are no jump tables.
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///
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bool isEmpty() const { return JumpTables.empty(); }
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const std::vector<MachineJumpTableEntry> &getJumpTables() const {
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return JumpTables;
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}
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unsigned getEntrySize() const { return TD.getPointerSize(); }
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unsigned getAlignment() const { return TD.getPointerAlignment(); }
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/// print - Used by the MachineFunction printer to print information about
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/// jump tables. Implemented in MachineFunction.cpp
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///
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void print(std::ostream &OS) const;
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/// dump - Call print(std::cerr) to be called from the debugger.
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///
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void dump() const;
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};
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} // End llvm namespace
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#endif
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