1 //===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
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 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to the XAS-format XCore assembly language.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "XCore.h"
16 #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/IR/Constants.h"
31 #include "llvm/IR/DataLayout.h"
32 #include "llvm/IR/DebugInfo.h"
33 #include "llvm/IR/DerivedTypes.h"
34 #include "llvm/IR/Mangler.h"
35 #include "llvm/IR/Module.h"
36 #include "llvm/MC/MCAsmInfo.h"
37 #include "llvm/MC/MCExpr.h"
38 #include "llvm/MC/MCInst.h"
39 #include "llvm/MC/MCStreamer.h"
40 #include "llvm/MC/MCSymbolELF.h"
41 #include "llvm/Support/ErrorHandling.h"
42 #include "llvm/Support/TargetRegistry.h"
43 #include "llvm/Support/raw_ostream.h"
44 #include "llvm/Target/TargetLoweringObjectFile.h"
45 #include <algorithm>
46 #include <cctype>
47 using namespace llvm;
48
49 #define DEBUG_TYPE "asm-printer"
50
51 namespace {
52 class XCoreAsmPrinter : public AsmPrinter {
53 XCoreMCInstLower MCInstLowering;
54 XCoreTargetStreamer &getTargetStreamer();
55
56 public:
XCoreAsmPrinter(TargetMachine & TM,std::unique_ptr<MCStreamer> Streamer)57 explicit XCoreAsmPrinter(TargetMachine &TM,
58 std::unique_ptr<MCStreamer> Streamer)
59 : AsmPrinter(TM, std::move(Streamer)), MCInstLowering(*this) {}
60
getPassName() const61 const char *getPassName() const override {
62 return "XCore Assembly Printer";
63 }
64
65 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
66 const std::string &directive = ".jmptable");
printInlineJT32(const MachineInstr * MI,int opNum,raw_ostream & O)67 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
68 printInlineJT(MI, opNum, O, ".jmptable32");
69 }
70 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
71 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
72 unsigned AsmVariant, const char *ExtraCode,
73 raw_ostream &O) override;
74 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
75 unsigned AsmVariant, const char *ExtraCode,
76 raw_ostream &O) override;
77
78 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
79 void EmitGlobalVariable(const GlobalVariable *GV) override;
80
81 void EmitFunctionEntryLabel() override;
82 void EmitInstruction(const MachineInstr *MI) override;
83 void EmitFunctionBodyStart() override;
84 void EmitFunctionBodyEnd() override;
85 };
86 } // end of anonymous namespace
87
getTargetStreamer()88 XCoreTargetStreamer &XCoreAsmPrinter::getTargetStreamer() {
89 return static_cast<XCoreTargetStreamer&>(*OutStreamer->getTargetStreamer());
90 }
91
emitArrayBound(MCSymbol * Sym,const GlobalVariable * GV)92 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
93 assert( ( GV->hasExternalLinkage() || GV->hasWeakLinkage() ||
94 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() ) &&
95 "Unexpected linkage");
96 if (ArrayType *ATy = dyn_cast<ArrayType>(
97 cast<PointerType>(GV->getType())->getElementType())) {
98
99 MCSymbol *SymGlob = OutContext.getOrCreateSymbol(
100 Twine(Sym->getName() + StringRef(".globound")));
101 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Global);
102 OutStreamer->EmitAssignment(SymGlob,
103 MCConstantExpr::create(ATy->getNumElements(),
104 OutContext));
105 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
106 GV->hasCommonLinkage()) {
107 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Weak);
108 }
109 }
110 }
111
EmitGlobalVariable(const GlobalVariable * GV)112 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
113 // Check to see if this is a special global used by LLVM, if so, emit it.
114 if (!GV->hasInitializer() ||
115 EmitSpecialLLVMGlobal(GV))
116 return;
117
118 const DataLayout &DL = getDataLayout();
119 OutStreamer->SwitchSection(
120 getObjFileLowering().SectionForGlobal(GV, *Mang, TM));
121
122 MCSymbol *GVSym = getSymbol(GV);
123 const Constant *C = GV->getInitializer();
124 unsigned Align = (unsigned)DL.getPreferredTypeAlignmentShift(C->getType());
125
126 // Mark the start of the global
127 getTargetStreamer().emitCCTopData(GVSym->getName());
128
129 switch (GV->getLinkage()) {
130 case GlobalValue::AppendingLinkage:
131 report_fatal_error("AppendingLinkage is not supported by this target!");
132 case GlobalValue::LinkOnceAnyLinkage:
133 case GlobalValue::LinkOnceODRLinkage:
134 case GlobalValue::WeakAnyLinkage:
135 case GlobalValue::WeakODRLinkage:
136 case GlobalValue::ExternalLinkage:
137 case GlobalValue::CommonLinkage:
138 emitArrayBound(GVSym, GV);
139 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
140
141 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
142 GV->hasCommonLinkage())
143 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
144 // FALL THROUGH
145 case GlobalValue::InternalLinkage:
146 case GlobalValue::PrivateLinkage:
147 break;
148 default:
149 llvm_unreachable("Unknown linkage type!");
150 }
151
152 EmitAlignment(Align > 2 ? Align : 2, GV);
153
154 if (GV->isThreadLocal()) {
155 report_fatal_error("TLS is not supported by this target!");
156 }
157 unsigned Size = DL.getTypeAllocSize(C->getType());
158 if (MAI->hasDotTypeDotSizeDirective()) {
159 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
160 OutStreamer->emitELFSize(cast<MCSymbolELF>(GVSym),
161 MCConstantExpr::create(Size, OutContext));
162 }
163 OutStreamer->EmitLabel(GVSym);
164
165 EmitGlobalConstant(DL, C);
166 // The ABI requires that unsigned scalar types smaller than 32 bits
167 // are padded to 32 bits.
168 if (Size < 4)
169 OutStreamer->EmitZeros(4 - Size);
170
171 // Mark the end of the global
172 getTargetStreamer().emitCCBottomData(GVSym->getName());
173 }
174
EmitFunctionBodyStart()175 void XCoreAsmPrinter::EmitFunctionBodyStart() {
176 MCInstLowering.Initialize(Mang, &MF->getContext());
177 }
178
179 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
180 /// the last basic block in the function.
EmitFunctionBodyEnd()181 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
182 // Emit function end directives
183 getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName());
184 }
185
EmitFunctionEntryLabel()186 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
187 // Mark the start of the function
188 getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName());
189 OutStreamer->EmitLabel(CurrentFnSym);
190 }
191
192 void XCoreAsmPrinter::
printInlineJT(const MachineInstr * MI,int opNum,raw_ostream & O,const std::string & directive)193 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
194 const std::string &directive) {
195 unsigned JTI = MI->getOperand(opNum).getIndex();
196 const MachineFunction *MF = MI->getParent()->getParent();
197 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
198 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
199 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
200 O << "\t" << directive << " ";
201 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
202 MachineBasicBlock *MBB = JTBBs[i];
203 if (i > 0)
204 O << ",";
205 MBB->getSymbol()->print(O, MAI);
206 }
207 }
208
printOperand(const MachineInstr * MI,int opNum,raw_ostream & O)209 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
210 raw_ostream &O) {
211 const DataLayout &DL = getDataLayout();
212 const MachineOperand &MO = MI->getOperand(opNum);
213 switch (MO.getType()) {
214 case MachineOperand::MO_Register:
215 O << XCoreInstPrinter::getRegisterName(MO.getReg());
216 break;
217 case MachineOperand::MO_Immediate:
218 O << MO.getImm();
219 break;
220 case MachineOperand::MO_MachineBasicBlock:
221 MO.getMBB()->getSymbol()->print(O, MAI);
222 break;
223 case MachineOperand::MO_GlobalAddress:
224 getSymbol(MO.getGlobal())->print(O, MAI);
225 break;
226 case MachineOperand::MO_ConstantPoolIndex:
227 O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
228 << MO.getIndex();
229 break;
230 case MachineOperand::MO_BlockAddress:
231 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
232 break;
233 default:
234 llvm_unreachable("not implemented");
235 }
236 }
237
238 /// PrintAsmOperand - Print out an operand for an inline asm expression.
239 ///
PrintAsmOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)240 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
241 unsigned AsmVariant,const char *ExtraCode,
242 raw_ostream &O) {
243 // Print the operand if there is no operand modifier.
244 if (!ExtraCode || !ExtraCode[0]) {
245 printOperand(MI, OpNo, O);
246 return false;
247 }
248
249 // Otherwise fallback on the default implementation.
250 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
251 }
252
253 bool XCoreAsmPrinter::
PrintAsmMemoryOperand(const MachineInstr * MI,unsigned OpNum,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)254 PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
255 unsigned AsmVariant, const char *ExtraCode,
256 raw_ostream &O) {
257 if (ExtraCode && ExtraCode[0]) {
258 return true; // Unknown modifier.
259 }
260 printOperand(MI, OpNum, O);
261 O << '[';
262 printOperand(MI, OpNum + 1, O);
263 O << ']';
264 return false;
265 }
266
EmitInstruction(const MachineInstr * MI)267 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
268 SmallString<128> Str;
269 raw_svector_ostream O(Str);
270
271 switch (MI->getOpcode()) {
272 case XCore::DBG_VALUE:
273 llvm_unreachable("Should be handled target independently");
274 case XCore::ADD_2rus:
275 if (MI->getOperand(2).getImm() == 0) {
276 O << "\tmov "
277 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
278 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
279 OutStreamer->EmitRawText(O.str());
280 return;
281 }
282 break;
283 case XCore::BR_JT:
284 case XCore::BR_JT32:
285 O << "\tbru "
286 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
287 if (MI->getOpcode() == XCore::BR_JT)
288 printInlineJT(MI, 0, O);
289 else
290 printInlineJT32(MI, 0, O);
291 O << '\n';
292 OutStreamer->EmitRawText(O.str());
293 return;
294 }
295
296 MCInst TmpInst;
297 MCInstLowering.Lower(MI, TmpInst);
298
299 EmitToStreamer(*OutStreamer, TmpInst);
300 }
301
302 // Force static initialization.
LLVMInitializeXCoreAsmPrinter()303 extern "C" void LLVMInitializeXCoreAsmPrinter() {
304 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);
305 }
306