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86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
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//===- Target/MInstructionInfo.h - Target Instruction Information -*-C++-*-===//
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//
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// MInstruction's are completely generic instructions that provide very little
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// interpretation upon their arguments and sementics. This file defines an
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// interface that should be used to get information about the semantics of the
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// actual instructions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MINSTRUCTIONINFO_H
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#define LLVM_CODEGEN_MINSTRUCTIONINFO_H
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#include <assert.h>
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#include <iosfwd>
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class MInstruction;
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class MRegisterInfo;
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/// MInstructionDesc - This record contains all of the information known about a
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/// particular instruction. Note that several instructions with the same
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/// mnemonic may be represented in the target machine as different instructions.
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///
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struct MInstructionDesc {
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const char *Name; // Assembly language mnemonic for the instruction.
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unsigned Flags; // Flags identifying inst properties (defined below)
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unsigned TSFlags; // Target Specific Flags
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};
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/// MIF namespace - This namespace contains flags that pertain to machine
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/// instructions
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///
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namespace MIF {
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enum {
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// Memory flags...
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LOAD = 1 << 0, // This instruction loads from memory
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STORE = 1 << 1, // This instruction stores to memory
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// Control flow flags...
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CALL = 1 << 2, // This instruction calls another function
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RET = 1 << 3, // This instruction returns from function
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BRANCH = 1 << 4, // This instruction is a branch
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};
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};
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/// MInstructionInfo base class - We assume that the target defines a static
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/// array of MInstructionDesc objects that represent all of the machine
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/// instructions that the target has. As such, we simply have to track a
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/// pointer to this array so that we can turn an instruction opcode into an
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/// instruction descriptor.
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///
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class MInstructionInfo {
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const MInstructionDesc *Desc; // Pointer to the descriptor array
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unsigned NumInstructions; // Number of entries in the array
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protected:
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MInstructionInfo(const MInstructionDesc *D, unsigned NI)
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: Desc(D), NumInstructions(NI) {}
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public:
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enum { // Target independant constants
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PHIOpcode = 0, /// Opcode for PHI instruction
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NoOpOpcode = 1, /// Opcode for noop instruction
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};
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/// getRegisterInfo - MInstructionInfo is a superset of MRegister info. As
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/// such, whenever a client has an instance of instruction info, it should
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/// always be able to get register info as well (through this method).
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///
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virtual const MRegisterInfo &getRegisterInfo() const = 0;
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const MInstructionDesc &operator[](unsigned Opcode) const {
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assert(Opcode < NumInstructions &&
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"Attempting to access record for invalid opcode!");
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return Desc[Opcode];
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}
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/// Provide a get method, equivalent to [], but more useful if we have a
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/// pointer to this object.
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const MInstructionDesc &get(unsigned Opcode) const {
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return operator[](Opcode);
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}
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virtual void print(const MInstruction *MI, std::ostream &O) const = 0;
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};
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#endif
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