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-rw-r--r--lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp609
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diff --git a/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp
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index 000000000000..659934930d46
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+++ b/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp
@@ -0,0 +1,609 @@
+//===-- X86IntelAsmPrinter.cpp - Convert X86 LLVM code to Intel assembly --===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to Intel format assembly language.
+// This printer is the output mechanism used by `llc'.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "asm-printer"
+#include "X86IntelAsmPrinter.h"
+#include "X86InstrInfo.h"
+#include "X86TargetAsmInfo.h"
+#include "X86.h"
+#include "llvm/CallingConv.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/CodeGen/DwarfWriter.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetOptions.h"
+using namespace llvm;
+
+STATISTIC(EmittedInsts, "Number of machine instrs printed");
+
+static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
+ const TargetData *TD) {
+ X86MachineFunctionInfo Info;
+ uint64_t Size = 0;
+
+ switch (F->getCallingConv()) {
+ case CallingConv::X86_StdCall:
+ Info.setDecorationStyle(StdCall);
+ break;
+ case CallingConv::X86_FastCall:
+ Info.setDecorationStyle(FastCall);
+ break;
+ default:
+ return Info;
+ }
+
+ unsigned argNum = 1;
+ for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
+ AI != AE; ++AI, ++argNum) {
+ const Type* Ty = AI->getType();
+
+ // 'Dereference' type in case of byval parameter attribute
+ if (F->paramHasAttr(argNum, Attribute::ByVal))
+ Ty = cast<PointerType>(Ty)->getElementType();
+
+ // Size should be aligned to DWORD boundary
+ Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
+ }
+
+ // We're not supporting tooooo huge arguments :)
+ Info.setBytesToPopOnReturn((unsigned int)Size);
+ return Info;
+}
+
+
+/// decorateName - Query FunctionInfoMap and use this information for various
+/// name decoration.
+void X86IntelAsmPrinter::decorateName(std::string &Name,
+ const GlobalValue *GV) {
+ const Function *F = dyn_cast<Function>(GV);
+ if (!F) return;
+
+ // We don't want to decorate non-stdcall or non-fastcall functions right now
+ unsigned CC = F->getCallingConv();
+ if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
+ return;
+
+ FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
+
+ const X86MachineFunctionInfo *Info;
+ if (info_item == FunctionInfoMap.end()) {
+ // Calculate apropriate function info and populate map
+ FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
+ Info = &FunctionInfoMap[F];
+ } else {
+ Info = &info_item->second;
+ }
+
+ const FunctionType *FT = F->getFunctionType();
+ switch (Info->getDecorationStyle()) {
+ case None:
+ break;
+ case StdCall:
+ // "Pure" variadic functions do not receive @0 suffix.
+ if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
+ (FT->getNumParams() == 1 && F->hasStructRetAttr()))
+ Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
+ break;
+ case FastCall:
+ // "Pure" variadic functions do not receive @0 suffix.
+ if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
+ (FT->getNumParams() == 1 && F->hasStructRetAttr()))
+ Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
+
+ if (Name[0] == '_')
+ Name[0] = '@';
+ else
+ Name = '@' + Name;
+
+ break;
+ default:
+ assert(0 && "Unsupported DecorationStyle");
+ }
+}
+
+/// runOnMachineFunction - This uses the printMachineInstruction()
+/// method to print assembly for each instruction.
+///
+bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
+ this->MF = &MF;
+ SetupMachineFunction(MF);
+ O << "\n\n";
+
+ // Print out constants referenced by the function
+ EmitConstantPool(MF.getConstantPool());
+
+ // Print out labels for the function.
+ const Function *F = MF.getFunction();
+ unsigned CC = F->getCallingConv();
+
+ // Populate function information map. Actually, We don't want to populate
+ // non-stdcall or non-fastcall functions' information right now.
+ if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
+ FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
+
+ decorateName(CurrentFnName, F);
+
+ SwitchToTextSection("_text", F);
+
+ unsigned FnAlign = 4;
+ if (F->hasFnAttr(Attribute::OptimizeForSize))
+ FnAlign = 1;
+ switch (F->getLinkage()) {
+ default: assert(0 && "Unsupported linkage type!");
+ case Function::PrivateLinkage:
+ case Function::InternalLinkage:
+ EmitAlignment(FnAlign);
+ break;
+ case Function::DLLExportLinkage:
+ DLLExportedFns.insert(CurrentFnName);
+ //FALLS THROUGH
+ case Function::ExternalLinkage:
+ O << "\tpublic " << CurrentFnName << "\n";
+ EmitAlignment(FnAlign);
+ break;
+ }
+
+ O << CurrentFnName << "\tproc near\n";
+
+ // Print out code for the function.
+ for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+ I != E; ++I) {
+ // Print a label for the basic block if there are any predecessors.
+ if (!I->pred_empty()) {
+ printBasicBlockLabel(I, true, true);
+ O << '\n';
+ }
+ for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
+ II != E; ++II) {
+ // Print the assembly for the instruction.
+ printMachineInstruction(II);
+ }
+ }
+
+ // Print out jump tables referenced by the function.
+ EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
+
+ O << CurrentFnName << "\tendp\n";
+
+ O.flush();
+
+ // We didn't modify anything.
+ return false;
+}
+
+void X86IntelAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
+ unsigned char value = MI->getOperand(Op).getImm();
+ assert(value <= 7 && "Invalid ssecc argument!");
+ switch (value) {
+ case 0: O << "eq"; break;
+ case 1: O << "lt"; break;
+ case 2: O << "le"; break;
+ case 3: O << "unord"; break;
+ case 4: O << "neq"; break;
+ case 5: O << "nlt"; break;
+ case 6: O << "nle"; break;
+ case 7: O << "ord"; break;
+ }
+}
+
+void X86IntelAsmPrinter::printOp(const MachineOperand &MO,
+ const char *Modifier) {
+ switch (MO.getType()) {
+ case MachineOperand::MO_Register: {
+ if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) {
+ unsigned Reg = MO.getReg();
+ if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
+ MVT VT = (strcmp(Modifier,"subreg64") == 0) ?
+ MVT::i64 : ((strcmp(Modifier, "subreg32") == 0) ? MVT::i32 :
+ ((strcmp(Modifier,"subreg16") == 0) ? MVT::i16 :MVT::i8));
+ Reg = getX86SubSuperRegister(Reg, VT);
+ }
+ O << TRI->getName(Reg);
+ } else
+ O << "reg" << MO.getReg();
+ return;
+ }
+ case MachineOperand::MO_Immediate:
+ O << MO.getImm();
+ return;
+ case MachineOperand::MO_MachineBasicBlock:
+ printBasicBlockLabel(MO.getMBB());
+ return;
+ case MachineOperand::MO_JumpTableIndex: {
+ bool isMemOp = Modifier && !strcmp(Modifier, "mem");
+ if (!isMemOp) O << "OFFSET ";
+ O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+ << "_" << MO.getIndex();
+ return;
+ }
+ case MachineOperand::MO_ConstantPoolIndex: {
+ bool isMemOp = Modifier && !strcmp(Modifier, "mem");
+ if (!isMemOp) O << "OFFSET ";
+ O << "[" << TAI->getPrivateGlobalPrefix() << "CPI"
+ << getFunctionNumber() << "_" << MO.getIndex();
+ printOffset(MO.getOffset());
+ O << "]";
+ return;
+ }
+ case MachineOperand::MO_GlobalAddress: {
+ bool isCallOp = Modifier && !strcmp(Modifier, "call");
+ bool isMemOp = Modifier && !strcmp(Modifier, "mem");
+ GlobalValue *GV = MO.getGlobal();
+ std::string Name = Mang->getValueName(GV);
+
+ decorateName(Name, GV);
+
+ if (!isMemOp && !isCallOp) O << "OFFSET ";
+ if (GV->hasDLLImportLinkage()) {
+ // FIXME: This should be fixed with full support of stdcall & fastcall
+ // CC's
+ O << "__imp_";
+ }
+ O << Name;
+ printOffset(MO.getOffset());
+ return;
+ }
+ case MachineOperand::MO_ExternalSymbol: {
+ bool isCallOp = Modifier && !strcmp(Modifier, "call");
+ if (!isCallOp) O << "OFFSET ";
+ O << TAI->getGlobalPrefix() << MO.getSymbolName();
+ return;
+ }
+ default:
+ O << "<unknown operand type>"; return;
+ }
+}
+
+void X86IntelAsmPrinter::printLeaMemReference(const MachineInstr *MI,
+ unsigned Op,
+ const char *Modifier) {
+ const MachineOperand &BaseReg = MI->getOperand(Op);
+ int ScaleVal = MI->getOperand(Op+1).getImm();
+ const MachineOperand &IndexReg = MI->getOperand(Op+2);
+ const MachineOperand &DispSpec = MI->getOperand(Op+3);
+
+ O << "[";
+ bool NeedPlus = false;
+ if (BaseReg.getReg()) {
+ printOp(BaseReg, Modifier);
+ NeedPlus = true;
+ }
+
+ if (IndexReg.getReg()) {
+ if (NeedPlus) O << " + ";
+ if (ScaleVal != 1)
+ O << ScaleVal << "*";
+ printOp(IndexReg, Modifier);
+ NeedPlus = true;
+ }
+
+ if (DispSpec.isGlobal() || DispSpec.isCPI() ||
+ DispSpec.isJTI()) {
+ if (NeedPlus)
+ O << " + ";
+ printOp(DispSpec, "mem");
+ } else {
+ int DispVal = DispSpec.getImm();
+ if (DispVal || (!BaseReg.getReg() && !IndexReg.getReg())) {
+ if (NeedPlus) {
+ if (DispVal > 0)
+ O << " + ";
+ else {
+ O << " - ";
+ DispVal = -DispVal;
+ }
+ }
+ O << DispVal;
+ }
+ }
+ O << "]";
+}
+
+void X86IntelAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
+ const char *Modifier) {
+ assert(isMem(MI, Op) && "Invalid memory reference!");
+ MachineOperand Segment = MI->getOperand(Op+4);
+ if (Segment.getReg()) {
+ printOperand(MI, Op+4, Modifier);
+ O << ':';
+ }
+ printLeaMemReference(MI, Op, Modifier);
+}
+
+void X86IntelAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
+ const MachineBasicBlock *MBB) const {
+ if (!TAI->getSetDirective())
+ return;
+
+ O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
+ << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
+ printBasicBlockLabel(MBB, false, false, false);
+ O << '-' << "\"L" << getFunctionNumber() << "$pb\"'\n";
+}
+
+void X86IntelAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
+ O << "\"L" << getFunctionNumber() << "$pb\"\n";
+ O << "\"L" << getFunctionNumber() << "$pb\":";
+}
+
+bool X86IntelAsmPrinter::printAsmMRegister(const MachineOperand &MO,
+ const char Mode) {
+ unsigned Reg = MO.getReg();
+ switch (Mode) {
+ default: return true; // Unknown mode.
+ case 'b': // Print QImode register
+ Reg = getX86SubSuperRegister(Reg, MVT::i8);
+ break;
+ case 'h': // Print QImode high register
+ Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
+ break;
+ case 'w': // Print HImode register
+ Reg = getX86SubSuperRegister(Reg, MVT::i16);
+ break;
+ case 'k': // Print SImode register
+ Reg = getX86SubSuperRegister(Reg, MVT::i32);
+ break;
+ }
+
+ O << '%' << TRI->getName(Reg);
+ return false;
+}
+
+/// PrintAsmOperand - Print out an operand for an inline asm expression.
+///
+bool X86IntelAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+ unsigned AsmVariant,
+ const char *ExtraCode) {
+ // Does this asm operand have a single letter operand modifier?
+ if (ExtraCode && ExtraCode[0]) {
+ if (ExtraCode[1] != 0) return true; // Unknown modifier.
+
+ switch (ExtraCode[0]) {
+ default: return true; // Unknown modifier.
+ case 'b': // Print QImode register
+ case 'h': // Print QImode high register
+ case 'w': // Print HImode register
+ case 'k': // Print SImode register
+ return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
+ }
+ }
+
+ printOperand(MI, OpNo);
+ return false;
+}
+
+bool X86IntelAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
+ unsigned OpNo,
+ unsigned AsmVariant,
+ const char *ExtraCode) {
+ if (ExtraCode && ExtraCode[0])
+ return true; // Unknown modifier.
+ printMemReference(MI, OpNo);
+ return false;
+}
+
+/// printMachineInstruction -- Print out a single X86 LLVM instruction
+/// MI in Intel syntax to the current output stream.
+///
+void X86IntelAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
+ ++EmittedInsts;
+
+ // Call the autogenerated instruction printer routines.
+ printInstruction(MI);
+}
+
+bool X86IntelAsmPrinter::doInitialization(Module &M) {
+ bool Result = AsmPrinter::doInitialization(M);
+
+ Mang->markCharUnacceptable('.');
+
+ O << "\t.686\n\t.model flat\n\n";
+
+ // Emit declarations for external functions.
+ for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
+ if (I->isDeclaration()) {
+ std::string Name = Mang->getValueName(I);
+ decorateName(Name, I);
+
+ O << "\textern " ;
+ if (I->hasDLLImportLinkage()) {
+ O << "__imp_";
+ }
+ O << Name << ":near\n";
+ }
+
+ // Emit declarations for external globals. Note that VC++ always declares
+ // external globals to have type byte, and if that's good enough for VC++...
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ if (I->isDeclaration()) {
+ std::string Name = Mang->getValueName(I);
+
+ O << "\textern " ;
+ if (I->hasDLLImportLinkage()) {
+ O << "__imp_";
+ }
+ O << Name << ":byte\n";
+ }
+ }
+
+ return Result;
+}
+
+bool X86IntelAsmPrinter::doFinalization(Module &M) {
+ const TargetData *TD = TM.getTargetData();
+
+ // Print out module-level global variables here.
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ if (I->isDeclaration()) continue; // External global require no code
+
+ // Check to see if this is a special global used by LLVM, if so, emit it.
+ if (EmitSpecialLLVMGlobal(I))
+ continue;
+
+ std::string name = Mang->getValueName(I);
+ Constant *C = I->getInitializer();
+ unsigned Align = TD->getPreferredAlignmentLog(I);
+ bool bCustomSegment = false;
+
+ switch (I->getLinkage()) {
+ case GlobalValue::CommonLinkage:
+ case GlobalValue::LinkOnceAnyLinkage:
+ case GlobalValue::LinkOnceODRLinkage:
+ case GlobalValue::WeakAnyLinkage:
+ case GlobalValue::WeakODRLinkage:
+ SwitchToDataSection("");
+ O << name << "?\tsegment common 'COMMON'\n";
+ bCustomSegment = true;
+ // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
+ // are also available.
+ break;
+ case GlobalValue::AppendingLinkage:
+ SwitchToDataSection("");
+ O << name << "?\tsegment public 'DATA'\n";
+ bCustomSegment = true;
+ // FIXME: the default alignment is 16 bytes, but 1, 2, 4, and 256
+ // are also available.
+ break;
+ case GlobalValue::DLLExportLinkage:
+ DLLExportedGVs.insert(name);
+ // FALL THROUGH
+ case GlobalValue::ExternalLinkage:
+ O << "\tpublic " << name << "\n";
+ // FALL THROUGH
+ case GlobalValue::InternalLinkage:
+ SwitchToSection(TAI->getDataSection());
+ break;
+ default:
+ assert(0 && "Unknown linkage type!");
+ }
+
+ if (!bCustomSegment)
+ EmitAlignment(Align, I);
+
+ O << name << ":";
+ if (VerboseAsm)
+ O << "\t\t\t\t" << TAI->getCommentString()
+ << " " << I->getName();
+ O << '\n';
+
+ EmitGlobalConstant(C);
+
+ if (bCustomSegment)
+ O << name << "?\tends\n";
+ }
+
+ // Output linker support code for dllexported globals
+ if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
+ SwitchToDataSection("");
+ O << "; WARNING: The following code is valid only with MASM v8.x"
+ << "and (possible) higher\n"
+ << "; This version of MASM is usually shipped with Microsoft "
+ << "Visual Studio 2005\n"
+ << "; or (possible) further versions. Unfortunately, there is no "
+ << "way to support\n"
+ << "; dllexported symbols in the earlier versions of MASM in fully "
+ << "automatic way\n\n";
+ O << "_drectve\t segment info alias('.drectve')\n";
+ }
+
+ for (StringSet<>::iterator i = DLLExportedGVs.begin(),
+ e = DLLExportedGVs.end();
+ i != e; ++i)
+ O << "\t db ' /EXPORT:" << i->getKeyData() << ",data'\n";
+
+ for (StringSet<>::iterator i = DLLExportedFns.begin(),
+ e = DLLExportedFns.end();
+ i != e; ++i)
+ O << "\t db ' /EXPORT:" << i->getKeyData() << "'\n";
+
+ if (!DLLExportedGVs.empty() || !DLLExportedFns.empty())
+ O << "_drectve\t ends\n";
+
+ // Bypass X86SharedAsmPrinter::doFinalization().
+ bool Result = AsmPrinter::doFinalization(M);
+ SwitchToDataSection("");
+ O << "\tend\n";
+ return Result;
+}
+
+void X86IntelAsmPrinter::EmitString(const ConstantArray *CVA) const {
+ unsigned NumElts = CVA->getNumOperands();
+ if (NumElts) {
+ // ML does not have escape sequences except '' for '. It also has a maximum
+ // string length of 255.
+ unsigned len = 0;
+ bool inString = false;
+ for (unsigned i = 0; i < NumElts; i++) {
+ int n = cast<ConstantInt>(CVA->getOperand(i))->getZExtValue() & 255;
+ if (len == 0)
+ O << "\tdb ";
+
+ if (n >= 32 && n <= 127) {
+ if (!inString) {
+ if (len > 0) {
+ O << ",'";
+ len += 2;
+ } else {
+ O << "'";
+ len++;
+ }
+ inString = true;
+ }
+ if (n == '\'') {
+ O << "'";
+ len++;
+ }
+ O << char(n);
+ } else {
+ if (inString) {
+ O << "'";
+ len++;
+ inString = false;
+ }
+ if (len > 0) {
+ O << ",";
+ len++;
+ }
+ O << n;
+ len += 1 + (n > 9) + (n > 99);
+ }
+
+ if (len > 60) {
+ if (inString) {
+ O << "'";
+ inString = false;
+ }
+ O << "\n";
+ len = 0;
+ }
+ }
+
+ if (len > 0) {
+ if (inString)
+ O << "'";
+ O << "\n";
+ }
+ }
+}
+
+// Include the auto-generated portion of the assembly writer.
+#include "X86GenAsmWriter1.inc"
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 22:30:09 +0000