1//===-- llvm/CodeGen/ObjectCodeEmitter.cpp -------------------- -*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#include "llvm/CodeGen/BinaryObject.h" 11#include "llvm/CodeGen/MachineBasicBlock.h" 12#include "llvm/CodeGen/MachineRelocation.h" 13#include "llvm/CodeGen/ObjectCodeEmitter.h" 14 15//===----------------------------------------------------------------------===// 16// ObjectCodeEmitter Implementation 17//===----------------------------------------------------------------------===// 18 19namespace llvm { 20 21ObjectCodeEmitter::ObjectCodeEmitter() : BO(0) {} 22ObjectCodeEmitter::ObjectCodeEmitter(BinaryObject *bo) : BO(bo) {} 23ObjectCodeEmitter::~ObjectCodeEmitter() {} 24 25/// setBinaryObject - set the BinaryObject we are writting to 26void ObjectCodeEmitter::setBinaryObject(BinaryObject *bo) { BO = bo; } 27 28/// emitByte - This callback is invoked when a byte needs to be 29/// written to the data stream, without buffer overflow testing. 30void ObjectCodeEmitter::emitByte(uint8_t B) { 31 BO->emitByte(B); 32} 33 34/// emitWordLE - This callback is invoked when a 32-bit word needs to be 35/// written to the data stream in little-endian format. 36void ObjectCodeEmitter::emitWordLE(uint32_t W) { 37 BO->emitWordLE(W); 38} 39 40/// emitWordBE - This callback is invoked when a 32-bit word needs to be 41/// written to the data stream in big-endian format. 42void ObjectCodeEmitter::emitWordBE(uint32_t W) { 43 BO->emitWordBE(W); 44} 45 46/// emitDWordLE - This callback is invoked when a 64-bit word needs to be 47/// written to the data stream in little-endian format. 48void ObjectCodeEmitter::emitDWordLE(uint64_t W) { 49 BO->emitDWordLE(W); 50} 51 52/// emitDWordBE - This callback is invoked when a 64-bit word needs to be 53/// written to the data stream in big-endian format. 54void ObjectCodeEmitter::emitDWordBE(uint64_t W) { 55 BO->emitDWordBE(W); 56} 57 58/// emitAlignment - Align 'BO' to the necessary alignment boundary. 59void ObjectCodeEmitter::emitAlignment(unsigned Alignment /* 0 */, 60 uint8_t fill /* 0 */) { 61 BO->emitAlignment(Alignment, fill); 62} 63 64/// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be 65/// written to the data stream. 66void ObjectCodeEmitter::emitULEB128Bytes(uint64_t Value) { 67 BO->emitULEB128Bytes(Value); 68} 69 70/// emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be 71/// written to the data stream. 72void ObjectCodeEmitter::emitSLEB128Bytes(uint64_t Value) { 73 BO->emitSLEB128Bytes(Value); 74} 75 76/// emitString - This callback is invoked when a String needs to be 77/// written to the data stream. 78void ObjectCodeEmitter::emitString(const std::string &String) { 79 BO->emitString(String); 80} 81 82/// getCurrentPCValue - This returns the address that the next emitted byte 83/// will be output to. 84uintptr_t ObjectCodeEmitter::getCurrentPCValue() const { 85 return BO->getCurrentPCOffset(); 86} 87 88/// getCurrentPCOffset - Return the offset from the start of the emitted 89/// buffer that we are currently writing to. 90uintptr_t ObjectCodeEmitter::getCurrentPCOffset() const { 91 return BO->getCurrentPCOffset(); 92} 93 94/// addRelocation - Whenever a relocatable address is needed, it should be 95/// noted with this interface. 96void ObjectCodeEmitter::addRelocation(const MachineRelocation& relocation) { 97 BO->addRelocation(relocation); 98} 99 100/// StartMachineBasicBlock - This should be called by the target when a new 101/// basic block is about to be emitted. This way the MCE knows where the 102/// start of the block is, and can implement getMachineBasicBlockAddress. 103void ObjectCodeEmitter::StartMachineBasicBlock(MachineBasicBlock *MBB) { 104 if (MBBLocations.size() <= (unsigned)MBB->getNumber()) 105 MBBLocations.resize((MBB->getNumber()+1)*2); 106 MBBLocations[MBB->getNumber()] = getCurrentPCOffset(); 107} 108 109/// getMachineBasicBlockAddress - Return the address of the specified 110/// MachineBasicBlock, only usable after the label for the MBB has been 111/// emitted. 112uintptr_t 113ObjectCodeEmitter::getMachineBasicBlockAddress(MachineBasicBlock *MBB) const { 114 assert(MBBLocations.size() > (unsigned)MBB->getNumber() && 115 MBBLocations[MBB->getNumber()] && "MBB not emitted!"); 116 return MBBLocations[MBB->getNumber()]; 117} 118 119/// getJumpTableEntryAddress - Return the address of the jump table with index 120/// 'Index' in the function that last called initJumpTableInfo. 121uintptr_t ObjectCodeEmitter::getJumpTableEntryAddress(unsigned Index) const { 122 assert(JTLocations.size() > Index && "JT not emitted!"); 123 return JTLocations[Index]; 124} 125 126/// getConstantPoolEntryAddress - Return the address of the 'Index' entry in 127/// the constant pool that was last emitted with the emitConstantPool method. 128uintptr_t ObjectCodeEmitter::getConstantPoolEntryAddress(unsigned Index) const { 129 assert(CPLocations.size() > Index && "CP not emitted!"); 130 return CPLocations[Index]; 131} 132 133/// getConstantPoolEntrySection - Return the section of the 'Index' entry in 134/// the constant pool that was last emitted with the emitConstantPool method. 135uintptr_t ObjectCodeEmitter::getConstantPoolEntrySection(unsigned Index) const { 136 assert(CPSections.size() > Index && "CP not emitted!"); 137 return CPSections[Index]; 138} 139 140} // end namespace llvm 141 142