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