1 //===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
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 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to the XAS-format XCore assembly language.
13 //===----------------------------------------------------------------------===//
15 #include "InstPrinter/XCoreInstPrinter.h"
17 #include "XCoreInstrInfo.h"
18 #include "XCoreMCInstLower.h"
19 #include "XCoreSubtarget.h"
20 #include "XCoreTargetMachine.h"
21 #include "XCoreTargetStreamer.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/CodeGen/AsmPrinter.h"
25 #include "llvm/CodeGen/MachineConstantPool.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/MachineInstr.h"
28 #include "llvm/CodeGen/MachineJumpTableInfo.h"
29 #include "llvm/CodeGen/MachineModuleInfo.h"
30 #include "llvm/CodeGen/TargetLoweringObjectFile.h"
31 #include "llvm/IR/Constants.h"
32 #include "llvm/IR/DataLayout.h"
33 #include "llvm/IR/DebugInfo.h"
34 #include "llvm/IR/DerivedTypes.h"
35 #include "llvm/IR/Mangler.h"
36 #include "llvm/IR/Module.h"
37 #include "llvm/MC/MCAsmInfo.h"
38 #include "llvm/MC/MCExpr.h"
39 #include "llvm/MC/MCInst.h"
40 #include "llvm/MC/MCStreamer.h"
41 #include "llvm/MC/MCSymbolELF.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/TargetRegistry.h"
44 #include "llvm/Support/raw_ostream.h"
49 #define DEBUG_TYPE "asm-printer"
52 class XCoreAsmPrinter : public AsmPrinter {
53 XCoreMCInstLower MCInstLowering;
54 XCoreTargetStreamer &getTargetStreamer();
57 explicit XCoreAsmPrinter(TargetMachine &TM,
58 std::unique_ptr<MCStreamer> Streamer)
59 : AsmPrinter(TM, std::move(Streamer)), MCInstLowering(*this) {}
61 StringRef getPassName() const override { return "XCore Assembly Printer"; }
63 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
64 const std::string &directive = ".jmptable");
65 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
66 printInlineJT(MI, opNum, O, ".jmptable32");
68 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
69 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
70 unsigned AsmVariant, const char *ExtraCode,
71 raw_ostream &O) override;
72 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
73 unsigned AsmVariant, const char *ExtraCode,
74 raw_ostream &O) override;
76 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
77 void EmitGlobalVariable(const GlobalVariable *GV) override;
79 void EmitFunctionEntryLabel() override;
80 void EmitInstruction(const MachineInstr *MI) override;
81 void EmitFunctionBodyStart() override;
82 void EmitFunctionBodyEnd() override;
84 } // end of anonymous namespace
86 XCoreTargetStreamer &XCoreAsmPrinter::getTargetStreamer() {
87 return static_cast<XCoreTargetStreamer&>(*OutStreamer->getTargetStreamer());
90 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
91 assert( ( GV->hasExternalLinkage() || GV->hasWeakLinkage() ||
92 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() ) &&
93 "Unexpected linkage");
94 if (ArrayType *ATy = dyn_cast<ArrayType>(GV->getValueType())) {
96 MCSymbol *SymGlob = OutContext.getOrCreateSymbol(
97 Twine(Sym->getName() + StringRef(".globound")));
98 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Global);
99 OutStreamer->EmitAssignment(SymGlob,
100 MCConstantExpr::create(ATy->getNumElements(),
102 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
103 GV->hasCommonLinkage()) {
104 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Weak);
109 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
110 // Check to see if this is a special global used by LLVM, if so, emit it.
111 if (!GV->hasInitializer() ||
112 EmitSpecialLLVMGlobal(GV))
115 const DataLayout &DL = getDataLayout();
116 OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(GV, TM));
118 MCSymbol *GVSym = getSymbol(GV);
119 const Constant *C = GV->getInitializer();
120 unsigned Align = (unsigned)DL.getPreferredTypeAlignmentShift(C->getType());
122 // Mark the start of the global
123 getTargetStreamer().emitCCTopData(GVSym->getName());
125 switch (GV->getLinkage()) {
126 case GlobalValue::AppendingLinkage:
127 report_fatal_error("AppendingLinkage is not supported by this target!");
128 case GlobalValue::LinkOnceAnyLinkage:
129 case GlobalValue::LinkOnceODRLinkage:
130 case GlobalValue::WeakAnyLinkage:
131 case GlobalValue::WeakODRLinkage:
132 case GlobalValue::ExternalLinkage:
133 case GlobalValue::CommonLinkage:
134 emitArrayBound(GVSym, GV);
135 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
137 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
138 GV->hasCommonLinkage())
139 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
141 case GlobalValue::InternalLinkage:
142 case GlobalValue::PrivateLinkage:
145 llvm_unreachable("Unknown linkage type!");
148 EmitAlignment(Align > 2 ? Align : 2, GV);
150 if (GV->isThreadLocal()) {
151 report_fatal_error("TLS is not supported by this target!");
153 unsigned Size = DL.getTypeAllocSize(C->getType());
154 if (MAI->hasDotTypeDotSizeDirective()) {
155 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
156 OutStreamer->emitELFSize(GVSym, MCConstantExpr::create(Size, OutContext));
158 OutStreamer->EmitLabel(GVSym);
160 EmitGlobalConstant(DL, C);
161 // The ABI requires that unsigned scalar types smaller than 32 bits
162 // are padded to 32 bits.
164 OutStreamer->EmitZeros(4 - Size);
166 // Mark the end of the global
167 getTargetStreamer().emitCCBottomData(GVSym->getName());
170 void XCoreAsmPrinter::EmitFunctionBodyStart() {
171 MCInstLowering.Initialize(&MF->getContext());
174 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
175 /// the last basic block in the function.
176 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
177 // Emit function end directives
178 getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName());
181 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
182 // Mark the start of the function
183 getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName());
184 OutStreamer->EmitLabel(CurrentFnSym);
187 void XCoreAsmPrinter::
188 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
189 const std::string &directive) {
190 unsigned JTI = MI->getOperand(opNum).getIndex();
191 const MachineFunction *MF = MI->getParent()->getParent();
192 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
193 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
194 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
195 O << "\t" << directive << " ";
196 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
197 MachineBasicBlock *MBB = JTBBs[i];
200 MBB->getSymbol()->print(O, MAI);
204 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
206 const DataLayout &DL = getDataLayout();
207 const MachineOperand &MO = MI->getOperand(opNum);
208 switch (MO.getType()) {
209 case MachineOperand::MO_Register:
210 O << XCoreInstPrinter::getRegisterName(MO.getReg());
212 case MachineOperand::MO_Immediate:
215 case MachineOperand::MO_MachineBasicBlock:
216 MO.getMBB()->getSymbol()->print(O, MAI);
218 case MachineOperand::MO_GlobalAddress:
219 getSymbol(MO.getGlobal())->print(O, MAI);
221 case MachineOperand::MO_ConstantPoolIndex:
222 O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
225 case MachineOperand::MO_BlockAddress:
226 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
229 llvm_unreachable("not implemented");
233 /// PrintAsmOperand - Print out an operand for an inline asm expression.
235 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
236 unsigned AsmVariant,const char *ExtraCode,
238 // Print the operand if there is no operand modifier.
239 if (!ExtraCode || !ExtraCode[0]) {
240 printOperand(MI, OpNo, O);
244 // Otherwise fallback on the default implementation.
245 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
248 bool XCoreAsmPrinter::
249 PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
250 unsigned AsmVariant, const char *ExtraCode,
252 if (ExtraCode && ExtraCode[0]) {
253 return true; // Unknown modifier.
255 printOperand(MI, OpNum, O);
257 printOperand(MI, OpNum + 1, O);
262 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
263 SmallString<128> Str;
264 raw_svector_ostream O(Str);
266 switch (MI->getOpcode()) {
267 case XCore::DBG_VALUE:
268 llvm_unreachable("Should be handled target independently");
269 case XCore::ADD_2rus:
270 if (MI->getOperand(2).getImm() == 0) {
272 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
273 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
274 OutStreamer->EmitRawText(O.str());
281 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
282 if (MI->getOpcode() == XCore::BR_JT)
283 printInlineJT(MI, 0, O);
285 printInlineJT32(MI, 0, O);
287 OutStreamer->EmitRawText(O.str());
292 MCInstLowering.Lower(MI, TmpInst);
294 EmitToStreamer(*OutStreamer, TmpInst);
297 // Force static initialization.
298 extern "C" void LLVMInitializeXCoreAsmPrinter() {
299 RegisterAsmPrinter<XCoreAsmPrinter> X(getTheXCoreTarget());