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8562d4ec7c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4873 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
//===-- llvm/CodeGen/MachineCodeEmitter.h - Code emission -------*- C++ -*-===//
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//
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// This file defines an abstract interface that is used by the machine code
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// emission framework to output the code. This allows machine code emission to
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// be seperated from concerns such as resolution of call targets, and where the
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// machine code will be written (memory or disk, f.e.).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINE_CODE_EMITTER_H
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#define LLVM_CODEGEN_MACHINE_CODE_EMITTER_H
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class MachineFunction;
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class MachineBasicBlock;
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class Value;
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struct MachineCodeEmitter {
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/// startFunction - This callback is invoked when the specified function is
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/// about to be code generated.
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///
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virtual void startFunction(MachineFunction &F) {}
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/// finishFunction - This callback is invoked when the specified function has
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/// finished code generation.
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///
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virtual void finishFunction(MachineFunction &F) {}
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/// startBasicBlock - This callback is invoked when a new basic block is about
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/// to be emitted.
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///
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virtual void startBasicBlock(MachineBasicBlock &BB) {}
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/// emitByte - This callback is invoked when a byte needs to be written to the
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/// output stream.
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///
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virtual void emitByte(unsigned char B) {}
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/// emitPCRelativeDisp - This callback is invoked when we need to write out a
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/// PC relative displacement for the specified Value*. This is used for call
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/// and jump instructions typically.
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///
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virtual void emitPCRelativeDisp(Value *V) {}
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};
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#endif
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