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+//===-- llvm/CodeGen/ObjectCodeEmitter.h - Object Code Emitter -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Generalized Object Code Emitter, works with ObjectModule and BinaryObject.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_OBJECTCODEEMITTER_H
+#define LLVM_CODEGEN_OBJECTCODEEMITTER_H
+
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+
+namespace llvm {
+
+class BinaryObject;
+class MachineBasicBlock;
+class MachineCodeEmitter;
+class MachineFunction;
+class MachineConstantPool;
+class MachineJumpTableInfo;
+class MachineModuleInfo;
+
+class ObjectCodeEmitter : public MachineCodeEmitter {
+protected:
+
+ /// Binary Object (Section or Segment) we are emitting to.
+ BinaryObject *BO;
+
+ /// MBBLocations - This vector is a mapping from MBB ID's to their address.
+ /// It is filled in by the StartMachineBasicBlock callback and queried by
+ /// the getMachineBasicBlockAddress callback.
+ std::vector<uintptr_t> MBBLocations;
+
+ /// LabelLocations - This vector is a mapping from Label ID's to their
+ /// address.
+ std::vector<uintptr_t> LabelLocations;
+
+ /// CPLocations - This is a map of constant pool indices to offsets from the
+ /// start of the section for that constant pool index.
+ std::vector<uintptr_t> CPLocations;
+
+ /// CPSections - This is a map of constant pool indices to the Section
+ /// containing the constant pool entry for that index.
+ std::vector<uintptr_t> CPSections;
+
+ /// JTLocations - This is a map of jump table indices to offsets from the
+ /// start of the section for that jump table index.
+ std::vector<uintptr_t> JTLocations;
+
+public:
+ ObjectCodeEmitter();
+ ObjectCodeEmitter(BinaryObject *bo);
+ virtual ~ObjectCodeEmitter();
+
+ /// setBinaryObject - set the BinaryObject we are writting to
+ void setBinaryObject(BinaryObject *bo);
+
+ /// emitByte - This callback is invoked when a byte needs to be
+ /// written to the data stream, without buffer overflow testing.
+ void emitByte(uint8_t B);
+
+ /// emitWordLE - This callback is invoked when a 32-bit word needs to be
+ /// written to the data stream in little-endian format.
+ void emitWordLE(uint32_t W);
+
+ /// emitWordBE - This callback is invoked when a 32-bit word needs to be
+ /// written to the data stream in big-endian format.
+ void emitWordBE(uint32_t W);
+
+ /// emitDWordLE - This callback is invoked when a 64-bit word needs to be
+ /// written to the data stream in little-endian format.
+ void emitDWordLE(uint64_t W);
+
+ /// emitDWordBE - This callback is invoked when a 64-bit word needs to be
+ /// written to the data stream in big-endian format.
+ void emitDWordBE(uint64_t W);
+
+ /// emitAlignment - Move the CurBufferPtr pointer up the the specified
+ /// alignment (saturated to BufferEnd of course).
+ void emitAlignment(unsigned Alignment = 0, uint8_t fill = 0);
+
+ /// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be
+ /// written to the data stream.
+ void emitULEB128Bytes(uint64_t Value);
+
+ /// emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be
+ /// written to the data stream.
+ void emitSLEB128Bytes(uint64_t Value);
+
+ /// emitString - This callback is invoked when a String needs to be
+ /// written to the data stream.
+ void emitString(const std::string &String);
+
+ /// getCurrentPCValue - This returns the address that the next emitted byte
+ /// will be output to.
+ uintptr_t getCurrentPCValue() const;
+
+ /// getCurrentPCOffset - Return the offset from the start of the emitted
+ /// buffer that we are currently writing to.
+ uintptr_t getCurrentPCOffset() const;
+
+ /// addRelocation - Whenever a relocatable address is needed, it should be
+ /// noted with this interface.
+ void addRelocation(const MachineRelocation& relocation);
+
+ /// earlyResolveAddresses - True if the code emitter can use symbol addresses
+ /// during code emission time. The JIT is capable of doing this because it
+ /// creates jump tables or constant pools in memory on the fly while the
+ /// object code emitters rely on a linker to have real addresses and should
+ /// use relocations instead.
+ bool earlyResolveAddresses() const { return false; }
+
+ /// startFunction - This callback is invoked when the specified function is
+ /// about to be code generated. This initializes the BufferBegin/End/Ptr
+ /// fields.
+ virtual void startFunction(MachineFunction &F) = 0;
+
+ /// finishFunction - This callback is invoked when the specified function has
+ /// finished code generation. If a buffer overflow has occurred, this method
+ /// returns true (the callee is required to try again), otherwise it returns
+ /// false.
+ virtual bool finishFunction(MachineFunction &F) = 0;
+
+ /// StartMachineBasicBlock - This should be called by the target when a new
+ /// basic block is about to be emitted. This way the MCE knows where the
+ /// start of the block is, and can implement getMachineBasicBlockAddress.
+ virtual void StartMachineBasicBlock(MachineBasicBlock *MBB);
+
+ /// getMachineBasicBlockAddress - Return the address of the specified
+ /// MachineBasicBlock, only usable after the label for the MBB has been
+ /// emitted.
+ virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const;
+
+ /// emitLabel - Emits a label
+ virtual void emitLabel(uint64_t LabelID) = 0;
+
+ /// getLabelAddress - Return the address of the specified LabelID, only usable
+ /// after the LabelID has been emitted.
+ virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0;
+
+ /// emitJumpTables - Emit all the jump tables for a given jump table info
+ /// record to the appropriate section.
+ virtual void emitJumpTables(MachineJumpTableInfo *MJTI) = 0;
+
+ /// getJumpTableEntryAddress - Return the address of the jump table with index
+ /// 'Index' in the function that last called initJumpTableInfo.
+ virtual uintptr_t getJumpTableEntryAddress(unsigned Index) const;
+
+ /// emitConstantPool - For each constant pool entry, figure out which section
+ /// the constant should live in, allocate space for it, and emit it to the
+ /// Section data buffer.
+ virtual void emitConstantPool(MachineConstantPool *MCP) = 0;
+
+ /// getConstantPoolEntryAddress - Return the address of the 'Index' entry in
+ /// the constant pool that was last emitted with the emitConstantPool method.
+ virtual uintptr_t getConstantPoolEntryAddress(unsigned Index) const;
+
+ /// getConstantPoolEntrySection - Return the section of the 'Index' entry in
+ /// the constant pool that was last emitted with the emitConstantPool method.
+ virtual uintptr_t getConstantPoolEntrySection(unsigned Index) const;
+
+ /// Specifies the MachineModuleInfo object. This is used for exception handling
+ /// purposes.
+ virtual void setModuleInfo(MachineModuleInfo* Info) = 0;
+ // to be implemented or depreciated with MachineModuleInfo
+
+}; // end class ObjectCodeEmitter
+
+} // end namespace llvm
+
+#endif
+
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