1 //===-- EmitAssembly.cpp - Emit Sparc Specific .s File ---------------------==//
3 // This file implements all of the stuff neccesary to output a .s file from
4 // LLVM. The code in this file assumes that the specified module has already
5 // been compiled into the internal data structures of the Module.
7 // The entry point of this file is the UltraSparc::emitAssembly method.
9 //===----------------------------------------------------------------------===//
11 #include "SparcInternals.h"
12 #include "llvm/Analysis/SlotCalculator.h"
13 #include "llvm/CodeGen/MachineInstr.h"
14 #include "llvm/BasicBlock.h"
15 #include "llvm/Method.h"
16 #include "llvm/Module.h"
17 #include "llvm/Support/StringExtras.h"
21 class SparcAsmPrinter {
33 inline SparcAsmPrinter(ostream &o, const Module *M, UltraSparc &t)
34 : Out(o), Table(SlotCalculator(M, true)), Target(t), CurSection(Unknown) {
39 void emitModule(const Module *M);
41 void processSymbolTable(const SymbolTable &ST);
42 void processConstant(const ConstPoolVal *CPV);
43 void processGlobal(const GlobalVariable *GV);
45 void emitMethod(const Method *M);
46 //void processMethodArgument(const MethodArgument *MA);
47 void emitBasicBlock(const BasicBlock *BB);
48 void emitMachineInst(const MachineInstr *MI);
51 //void writeOperand(const Value *Op, bool PrintType, bool PrintName = true);
54 // enterSection - Use this method to enter a different section of the output
55 // executable. This is used to only output neccesary section transitions.
57 void enterSection(enum Sections S) {
58 if (S == CurSection) return; // Only switch section if neccesary
61 Out << ".section \".";
63 default: assert(0 && "Bad section name!");
64 case Text: Out << "text"; break;
65 case Data: Out << "data"; break;
66 case ReadOnly: Out << "rodata"; break;
71 string getEscapedString(const string &S) {
74 for (unsigned i = 0; i < S.size(); ++i) {
76 if ((C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') ||
77 (C >= '0' && C <= '9')) {
81 Result += char('0' + ((unsigned char)C >> 4));
82 Result += char('0' + (C & 0xF));
88 // getID - Return a valid identifier for the specified value. Base it on
89 // the name of the identifier if possible, use a numbered value based on
90 // prefix otherwise. FPrefix is always prepended to the output identifier.
92 string getID(const Value *V, const char *Prefix, const char *FPrefix = 0) {
93 string FP(FPrefix ? FPrefix : ""); // "Forced prefix"
95 return FP + getEscapedString(V->getName());
97 assert(Table.getValSlot(V) != -1 && "Value not in value table!");
98 return FP + string(Prefix) + itostr(Table.getValSlot(V));
102 // getID Wrappers - Ensure consistent usage...
103 string getID(const Method *M) { return getID(M, "anon_method$"); }
104 string getID(const BasicBlock *BB) {
105 return getID(BB, "LL", (".L$"+getID(BB->getParent())+"$").c_str());
108 unsigned getOperandMask(unsigned Opcode) {
110 case SUBcc: return 1 << 3; // Remove CC argument
111 case BA: case BRZ: // Remove Arg #0, which is always null or xcc
112 case BRLEZ: case BRLZ:
113 case BRNZ: case BRGZ:
114 case BRGEZ: return 1 << 0;
115 default: return 0; // By default, don't hack operands...
121 void SparcAsmPrinter::emitMachineInst(const MachineInstr *MI) {
122 unsigned Opcode = MI->getOpCode();
124 if (TargetInstrDescriptors[Opcode].iclass & M_DUMMY_PHI_FLAG)
125 return; // IGNORE PHI NODES
127 Out << "\t" << TargetInstrDescriptors[Opcode].opCodeString << "\t";
129 unsigned Mask = getOperandMask(Opcode);
131 bool NeedComma = false;
132 for(unsigned OpNum = 0; OpNum < MI->getNumOperands(); ++OpNum) {
133 if ((1 << OpNum) & Mask) continue; // Ignore this operand?
135 const MachineOperand &Op = MI->getOperand(OpNum);
136 if (NeedComma) Out << ", "; // Handle comma outputing
139 switch (Op.getOperandType()) {
140 case MachineOperand::MO_VirtualRegister:
141 case MachineOperand::MO_CCRegister:
142 case MachineOperand::MO_MachineRegister: {
143 int RegNum = (int)Op.getAllocatedRegNum();
145 // ****this code is temporary till NULL Values are fixed
146 if (RegNum == 10000) {
147 Out << "<NULL VALUE>";
151 Out << "%" << Target.getRegInfo().getUnifiedRegName(RegNum);
155 case MachineOperand::MO_PCRelativeDisp: {
156 const Value *Val = Op.getVRegValue();
158 Out << "\t<*NULL Value*>";
159 } else if (Val->isBasicBlock()) {
160 Out << getID(Val->castBasicBlockAsserting());
162 Out << "<unknown value=" << Val << ">";
168 Out << Op; // use dump field
175 void SparcAsmPrinter::emitBasicBlock(const BasicBlock *BB) {
176 // Emit a label for the basic block
177 Out << getID(BB) << ":\n";
179 // Get the vector of machine instructions corresponding to this bb.
180 const MachineCodeForBasicBlock &MIs = BB->getMachineInstrVec();
181 MachineCodeForBasicBlock::const_iterator MII = MIs.begin(), MIE = MIs.end();
183 // Loop over all of the instructions in the basic block...
184 for (; MII != MIE; ++MII)
185 emitMachineInst(*MII);
186 Out << "\n"; // Seperate BB's with newlines
189 void SparcAsmPrinter::emitMethod(const Method *M) {
190 if (M->isExternal()) return;
192 // Make sure the slot table has information about this method...
193 Table.incorporateMethod(M);
195 string MethName = getID(M);
196 Out << "!****** Outputing Method: " << MethName << " ******\n";
198 Out << "\t.align 4\n\t.global\t" << MethName << "\n";
199 //Out << "\t.type\t" << MethName << ",#function\n";
200 Out << MethName << ":\n";
202 // Output code for all of the basic blocks in the method...
203 for (Method::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
206 // Output a .size directive so the debugger knows the extents of the function
207 Out << ".EndOf$" << MethName << ":\n\t.size " << MethName << ", .EndOf$"
208 << MethName << "-" << MethName << endl;
210 // Put some spaces between the methods
213 // Forget all about M.
218 void SparcAsmPrinter::emitModule(const Module *M) {
219 // TODO: Look for a filename annotation on M to emit a .file directive
220 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
224 } // End anonymous namespace
227 // emitAssembly - Output assembly language code (a .s file) for the specified
228 // method. The specified method must have been compiled before this may be
231 void UltraSparc::emitAssembly(const Module *M, ostream &Out) {
232 SparcAsmPrinter Print(Out, M, *this);