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 // getID - Return a valid identifier for the specified value. Base it on
72 // the name of the identifier if possible, use a numbered value based on
73 // prefix otherwise. FPrefix is always prepended to the output identifier.
75 string getID(const Value *V, const char *Prefix, const char *FPrefix = 0) {
76 string FP(FPrefix ? FPrefix : ""); // "Forced prefix"
78 return FP + V->getName(); // TODO: Escape name if needed
80 assert(Table.getValSlot(V) != -1 && "Value not in value table!");
81 return FP + string(Prefix) + itostr(Table.getValSlot(V));
85 // getID Wrappers - Ensure consistent usage...
86 string getID(const Method *M) { return getID(M, "anon_method$"); }
87 string getID(const BasicBlock *BB) {
88 return getID(BB, "LL", (".L$"+getID(BB->getParent())).c_str());
91 unsigned getOperandMask(unsigned Opcode) {
93 case SUBcc: return 1 << 3; // Remove CC argument
94 case BA: return 1 << 0; // Remove Arg #0, which is always null
95 default: return 0; // By default, don't hack operands...
101 void SparcAsmPrinter::emitMachineInst(const MachineInstr *MI) {
102 unsigned Opcode = MI->getOpCode();
104 if (TargetInstrDescriptors[Opcode].iclass & M_DUMMY_PHI_FLAG)
105 return; // IGNORE PHI NODES
107 Out << "\t" << TargetInstrDescriptors[Opcode].opCodeString << "\t";
109 unsigned Mask = getOperandMask(Opcode);
111 bool NeedComma = false;
112 for(unsigned OpNum = 0; OpNum < MI->getNumOperands(); ++OpNum) {
113 if ((1 << OpNum) & Mask) continue; // Ignore this operand?
115 const MachineOperand &Op = MI->getOperand(OpNum);
116 if (NeedComma) Out << ", "; // Handle comma outputing
119 switch (Op.getOperandType()) {
120 case MachineOperand::MO_VirtualRegister:
121 case MachineOperand::MO_CCRegister:
122 case MachineOperand::MO_MachineRegister: {
123 int RegNum = (int)Op.getAllocatedRegNum();
125 // ****this code is temporary till NULL Values are fixed
126 if (RegNum == 10000) {
127 Out << "<NULL VALUE>";
131 Out << "%" << Target.getRegInfo().getUnifiedRegName(RegNum);
135 case MachineOperand::MO_PCRelativeDisp: {
136 const Value *Val = Op.getVRegValue();
138 Out << "\t<*NULL Value*>";
139 } else if (Val->isBasicBlock()) {
140 Out << getID(Val->castBasicBlockAsserting());
142 Out << "<unknown value=" << Val << ">";
148 Out << Op; // use dump field
155 void SparcAsmPrinter::emitBasicBlock(const BasicBlock *BB) {
156 // Emit a label for the basic block
157 Out << getID(BB) << ":\n";
159 // Get the vector of machine instructions corresponding to this bb.
160 const MachineCodeForBasicBlock &MIs = BB->getMachineInstrVec();
161 MachineCodeForBasicBlock::const_iterator MII = MIs.begin(), MIE = MIs.end();
163 // Loop over all of the instructions in the basic block...
164 for (; MII != MIE; ++MII)
165 emitMachineInst(*MII);
166 Out << "\n"; // Seperate BB's with newlines
169 void SparcAsmPrinter::emitMethod(const Method *M) {
170 if (M->isExternal()) return;
172 // Make sure the slot table has information about this method...
173 Table.incorporateMethod(M);
175 string MethName = getID(M);
176 Out << "!****** Outputing Method: " << MethName << " ******\n";
178 Out << "\t.align 4\n\t.global\t" << MethName << "\n";
179 Out << "\t.type\t" << MethName << ",#function\n";
180 Out << MethName << ":\n";
182 // Output code for all of the basic blocks in the method...
183 for (Method::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
186 // Output a .size directive so the debugger knows the extents of the function
187 Out << ".EndOf$" << MethName << ":\n\t.size " << MethName << ", .EndOf$"
188 << MethName << "-" << MethName << endl;
190 // Put some spaces between the methods
193 // Forget all about M.
198 void SparcAsmPrinter::emitModule(const Module *M) {
199 // TODO: Look for a filename annotation on M to emit a .file directive
200 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
204 } // End anonymous namespace
207 // emitAssembly - Output assembly language code (a .s file) for the specified
208 // method. The specified method must have been compiled before this may be
211 void UltraSparc::emitAssembly(const Module *M, ostream &Out) {
212 SparcAsmPrinter Print(Out, M, *this);