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https://github.com/c64scene-ar/llvm-6502.git
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densemap instead of StringMap to match FnStubs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81513 91177308-0d34-0410-b5e6-96231b3b80d8
1001 lines
34 KiB
C++
1001 lines
34 KiB
C++
//===-- X86ATTAsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to AT&T format assembly
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// language. This printer is the output mechanism used by `llc'.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "X86ATTAsmPrinter.h"
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#include "X86.h"
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#include "X86COFF.h"
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#include "X86MachineFunctionInfo.h"
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#include "X86TargetMachine.h"
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#include "llvm/CallingConv.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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STATISTIC(EmittedInsts, "Number of machine instrs printed");
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static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
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cl::Hidden, cl::init(false));
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//===----------------------------------------------------------------------===//
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// Primitive Helper Functions.
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//===----------------------------------------------------------------------===//
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void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
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// FIXME: the actual label generated doesn't matter here! Just mangle in
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// something unique (the function number) with Private prefix.
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if (Subtarget->isTargetDarwin())
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O << "\"L" << getFunctionNumber() << "$pb\"";
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else {
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assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
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O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
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}
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}
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static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
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const TargetData *TD) {
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X86MachineFunctionInfo Info;
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uint64_t Size = 0;
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switch (F->getCallingConv()) {
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case CallingConv::X86_StdCall:
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Info.setDecorationStyle(StdCall);
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break;
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case CallingConv::X86_FastCall:
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Info.setDecorationStyle(FastCall);
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break;
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default:
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return Info;
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}
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unsigned argNum = 1;
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for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
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AI != AE; ++AI, ++argNum) {
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const Type* Ty = AI->getType();
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// 'Dereference' type in case of byval parameter attribute
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if (F->paramHasAttr(argNum, Attribute::ByVal))
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Ty = cast<PointerType>(Ty)->getElementType();
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// Size should be aligned to DWORD boundary
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Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
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}
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// We're not supporting tooooo huge arguments :)
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Info.setBytesToPopOnReturn((unsigned int)Size);
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return Info;
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}
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/// DecorateCygMingName - Query FunctionInfoMap and use this information for
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/// various name decorations for Cygwin and MingW.
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void X86ATTAsmPrinter::DecorateCygMingName(SmallVectorImpl<char> &Name,
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const GlobalValue *GV) {
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assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
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const Function *F = dyn_cast<Function>(GV);
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if (!F) return;
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// Save function name for later type emission.
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if (F->isDeclaration())
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CygMingStubs.insert(StringRef(Name.data(), Name.size()));
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// We don't want to decorate non-stdcall or non-fastcall functions right now
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CallingConv::ID CC = F->getCallingConv();
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if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
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return;
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const X86MachineFunctionInfo *Info;
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FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
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if (info_item == FunctionInfoMap.end()) {
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// Calculate apropriate function info and populate map
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FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
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Info = &FunctionInfoMap[F];
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} else {
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Info = &info_item->second;
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}
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if (Info->getDecorationStyle() == None) return;
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const FunctionType *FT = F->getFunctionType();
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// "Pure" variadic functions do not receive @0 suffix.
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if (!FT->isVarArg() || FT->getNumParams() == 0 ||
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(FT->getNumParams() == 1 && F->hasStructRetAttr()))
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raw_svector_ostream(Name) << '@' << Info->getBytesToPopOnReturn();
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if (Info->getDecorationStyle() == FastCall) {
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if (Name[0] == '_')
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Name[0] = '@';
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else
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Name.insert(Name.begin(), '@');
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}
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}
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/// DecorateCygMingName - Query FunctionInfoMap and use this information for
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/// various name decorations for Cygwin and MingW.
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void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
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const GlobalValue *GV) {
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SmallString<128> NameStr(Name.begin(), Name.end());
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DecorateCygMingName(NameStr, GV);
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Name.assign(NameStr.begin(), NameStr.end());
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}
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void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
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unsigned FnAlign = MF.getAlignment();
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const Function *F = MF.getFunction();
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if (Subtarget->isTargetCygMing())
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DecorateCygMingName(CurrentFnName, F);
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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
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EmitAlignment(FnAlign, F);
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switch (F->getLinkage()) {
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default: llvm_unreachable("Unknown linkage type!");
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case Function::InternalLinkage: // Symbols default to internal.
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case Function::PrivateLinkage:
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break;
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case Function::DLLExportLinkage:
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case Function::ExternalLinkage:
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O << "\t.globl\t" << CurrentFnName << '\n';
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break;
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case Function::LinkerPrivateLinkage:
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case Function::LinkOnceAnyLinkage:
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case Function::LinkOnceODRLinkage:
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case Function::WeakAnyLinkage:
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case Function::WeakODRLinkage:
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if (Subtarget->isTargetDarwin()) {
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O << "\t.globl\t" << CurrentFnName << '\n';
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O << MAI->getWeakDefDirective() << CurrentFnName << '\n';
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} else if (Subtarget->isTargetCygMing()) {
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O << "\t.globl\t" << CurrentFnName << "\n"
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"\t.linkonce discard\n";
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} else {
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O << "\t.weak\t" << CurrentFnName << '\n';
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}
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break;
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}
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printVisibility(CurrentFnName, F->getVisibility());
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if (Subtarget->isTargetELF())
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O << "\t.type\t" << CurrentFnName << ",@function\n";
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else if (Subtarget->isTargetCygMing()) {
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O << "\t.def\t " << CurrentFnName
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<< ";\t.scl\t" <<
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(F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
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<< ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
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<< ";\t.endef\n";
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}
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O << CurrentFnName << ':';
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if (VerboseAsm) {
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O.PadToColumn(MAI->getCommentColumn());
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O << MAI->getCommentString() << ' ';
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WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
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}
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O << '\n';
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// Add some workaround for linkonce linkage on Cygwin\MinGW
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if (Subtarget->isTargetCygMing() &&
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(F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
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O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
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}
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/// runOnMachineFunction - This uses the printMachineInstruction()
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/// method to print assembly for each instruction.
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///
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bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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const Function *F = MF.getFunction();
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this->MF = &MF;
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CallingConv::ID CC = F->getCallingConv();
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SetupMachineFunction(MF);
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O << "\n\n";
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// Populate function information map. Actually, We don't want to populate
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// non-stdcall or non-fastcall functions' information right now.
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if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
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FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
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// Print out constants referenced by the function
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EmitConstantPool(MF.getConstantPool());
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if (F->hasDLLExportLinkage())
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DLLExportedFns.insert(Mang->getMangledName(F));
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// Print the 'header' of function
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emitFunctionHeader(MF);
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// Emit pre-function debug and/or EH information.
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if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
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DW->BeginFunction(&MF);
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// Print out code for the function.
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bool hasAnyRealCode = false;
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for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
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I != E; ++I) {
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// Print a label for the basic block.
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if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
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// This is an entry block or a block that's only reachable via a
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// fallthrough edge. In non-VerboseAsm mode, don't print the label.
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} else {
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printBasicBlockLabel(I, true, true, VerboseAsm);
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O << '\n';
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}
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for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
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II != IE; ++II) {
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// Print the assembly for the instruction.
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if (!II->isLabel())
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hasAnyRealCode = true;
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printMachineInstruction(II);
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}
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}
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if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
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// If the function is empty, then we need to emit *something*. Otherwise,
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// the function's label might be associated with something that it wasn't
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// meant to be associated with. We emit a noop in this situation.
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// We are assuming inline asms are code.
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O << "\tnop\n";
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}
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if (MAI->hasDotTypeDotSizeDirective())
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O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
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// Emit post-function debug information.
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if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
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DW->EndFunction(&MF);
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// Print out jump tables referenced by the function.
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EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
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// We didn't modify anything.
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return false;
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}
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/// printSymbolOperand - Print a raw symbol reference operand. This handles
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/// jump tables, constant pools, global address and external symbols, all of
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/// which print to a label with various suffixes for relocation types etc.
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void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
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switch (MO.getType()) {
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default: llvm_unreachable("unknown symbol type!");
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case MachineOperand::MO_JumpTableIndex:
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O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
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<< MO.getIndex();
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
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<< MO.getIndex();
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printOffset(MO.getOffset());
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break;
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case MachineOperand::MO_GlobalAddress: {
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const GlobalValue *GV = MO.getGlobal();
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const char *Suffix = "";
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if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
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Suffix = "$stub";
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else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
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MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
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MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
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Suffix = "$non_lazy_ptr";
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std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
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if (Subtarget->isTargetCygMing())
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DecorateCygMingName(Name, GV);
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// Handle dllimport linkage.
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if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
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Name = "__imp_" + Name;
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if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
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MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
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SmallString<128> NameStr;
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Mang->getNameWithPrefix(NameStr, GV, true);
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NameStr += "$non_lazy_ptr";
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MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
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MCSymbol *&StubSym = GVStubs[Sym];
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if (StubSym == 0) {
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NameStr.clear();
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Mang->getNameWithPrefix(NameStr, GV, false);
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StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
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}
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} else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
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HiddenGVStubs[Name] = Mang->getMangledName(GV);
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} else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
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SmallString<128> NameStr;
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Mang->getNameWithPrefix(NameStr, GV, true);
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NameStr += "$stub";
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MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
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MCSymbol *&StubSym = FnStubs[Sym];
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if (StubSym == 0) {
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NameStr.clear();
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Mang->getNameWithPrefix(NameStr, GV, false);
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StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
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}
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}
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// If the name begins with a dollar-sign, enclose it in parens. We do this
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// to avoid having it look like an integer immediate to the assembler.
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if (Name[0] == '$')
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O << '(' << Name << ')';
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else
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O << Name;
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printOffset(MO.getOffset());
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break;
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}
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case MachineOperand::MO_ExternalSymbol: {
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std::string Name = Mang->makeNameProper(MO.getSymbolName());
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if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
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Name += "$stub";
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MCSymbol *&StubSym = FnStubs[OutContext.GetOrCreateSymbol(Name)];
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if (StubSym == 0) {
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Name.erase(Name.end()-5, Name.end());
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StubSym = OutContext.GetOrCreateSymbol(Name);
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}
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}
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// If the name begins with a dollar-sign, enclose it in parens. We do this
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// to avoid having it look like an integer immediate to the assembler.
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if (Name[0] == '$')
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O << '(' << Name << ')';
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else
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O << Name;
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break;
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}
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}
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switch (MO.getTargetFlags()) {
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default:
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llvm_unreachable("Unknown target flag on GV operand");
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case X86II::MO_NO_FLAG: // No flag.
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break;
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case X86II::MO_DARWIN_NONLAZY:
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case X86II::MO_DLLIMPORT:
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case X86II::MO_DARWIN_STUB:
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// These affect the name of the symbol, not any suffix.
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break;
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case X86II::MO_GOT_ABSOLUTE_ADDRESS:
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O << " + [.-";
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PrintPICBaseSymbol();
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O << ']';
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break;
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case X86II::MO_PIC_BASE_OFFSET:
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case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
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case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
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O << '-';
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PrintPICBaseSymbol();
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break;
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case X86II::MO_TLSGD: O << "@TLSGD"; break;
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case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
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case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
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case X86II::MO_TPOFF: O << "@TPOFF"; break;
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case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
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case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
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case X86II::MO_GOT: O << "@GOT"; break;
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case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
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case X86II::MO_PLT: O << "@PLT"; break;
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}
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}
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/// print_pcrel_imm - This is used to print an immediate value that ends up
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/// being encoded as a pc-relative value. These print slightly differently, for
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/// example, a $ is not emitted.
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void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
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const MachineOperand &MO = MI->getOperand(OpNo);
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switch (MO.getType()) {
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default: llvm_unreachable("Unknown pcrel immediate operand");
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case MachineOperand::MO_Immediate:
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O << MO.getImm();
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return;
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case MachineOperand::MO_MachineBasicBlock:
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printBasicBlockLabel(MO.getMBB(), false, false, false);
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return;
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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printSymbolOperand(MO);
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return;
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}
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}
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void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
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const char *Modifier) {
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const MachineOperand &MO = MI->getOperand(OpNo);
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switch (MO.getType()) {
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default: llvm_unreachable("unknown operand type!");
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case MachineOperand::MO_Register: {
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assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
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"Virtual registers should not make it this far!");
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O << '%';
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unsigned Reg = MO.getReg();
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if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
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EVT VT = (strcmp(Modifier+6,"64") == 0) ?
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MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
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((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
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Reg = getX86SubSuperRegister(Reg, VT);
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}
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O << TRI->getAsmName(Reg);
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return;
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}
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case MachineOperand::MO_Immediate:
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O << '$' << MO.getImm();
|
|
return;
|
|
|
|
case MachineOperand::MO_JumpTableIndex:
|
|
case MachineOperand::MO_ConstantPoolIndex:
|
|
case MachineOperand::MO_GlobalAddress:
|
|
case MachineOperand::MO_ExternalSymbol: {
|
|
O << '$';
|
|
printSymbolOperand(MO);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void X86ATTAsmPrinter::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 X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
|
|
const char *Modifier) {
|
|
const MachineOperand &BaseReg = MI->getOperand(Op);
|
|
const MachineOperand &IndexReg = MI->getOperand(Op+2);
|
|
const MachineOperand &DispSpec = MI->getOperand(Op+3);
|
|
|
|
// If we really don't want to print out (rip), don't.
|
|
bool HasBaseReg = BaseReg.getReg() != 0;
|
|
if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
|
|
BaseReg.getReg() == X86::RIP)
|
|
HasBaseReg = false;
|
|
|
|
// HasParenPart - True if we will print out the () part of the mem ref.
|
|
bool HasParenPart = IndexReg.getReg() || HasBaseReg;
|
|
|
|
if (DispSpec.isImm()) {
|
|
int DispVal = DispSpec.getImm();
|
|
if (DispVal || !HasParenPart)
|
|
O << DispVal;
|
|
} else {
|
|
assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
|
|
DispSpec.isJTI() || DispSpec.isSymbol());
|
|
printSymbolOperand(MI->getOperand(Op+3));
|
|
}
|
|
|
|
if (HasParenPart) {
|
|
assert(IndexReg.getReg() != X86::ESP &&
|
|
"X86 doesn't allow scaling by ESP");
|
|
|
|
O << '(';
|
|
if (HasBaseReg)
|
|
printOperand(MI, Op, Modifier);
|
|
|
|
if (IndexReg.getReg()) {
|
|
O << ',';
|
|
printOperand(MI, Op+2, Modifier);
|
|
unsigned ScaleVal = MI->getOperand(Op+1).getImm();
|
|
if (ScaleVal != 1)
|
|
O << ',' << ScaleVal;
|
|
}
|
|
O << ')';
|
|
}
|
|
}
|
|
|
|
void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
|
|
const char *Modifier) {
|
|
assert(isMem(MI, Op) && "Invalid memory reference!");
|
|
const MachineOperand &Segment = MI->getOperand(Op+4);
|
|
if (Segment.getReg()) {
|
|
printOperand(MI, Op+4, Modifier);
|
|
O << ':';
|
|
}
|
|
printLeaMemReference(MI, Op, Modifier);
|
|
}
|
|
|
|
void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
|
|
const MachineBasicBlock *MBB) const {
|
|
if (!MAI->getSetDirective())
|
|
return;
|
|
|
|
// We don't need .set machinery if we have GOT-style relocations
|
|
if (Subtarget->isPICStyleGOT())
|
|
return;
|
|
|
|
O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
|
|
<< getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
|
|
printBasicBlockLabel(MBB, false, false, false);
|
|
if (Subtarget->isPICStyleRIPRel())
|
|
O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
|
|
<< '_' << uid << '\n';
|
|
else {
|
|
O << '-';
|
|
PrintPICBaseSymbol();
|
|
O << '\n';
|
|
}
|
|
}
|
|
|
|
|
|
void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
|
|
PrintPICBaseSymbol();
|
|
O << '\n';
|
|
PrintPICBaseSymbol();
|
|
O << ':';
|
|
}
|
|
|
|
|
|
void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
|
|
const MachineBasicBlock *MBB,
|
|
unsigned uid) const {
|
|
const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
|
|
MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
|
|
|
|
O << JTEntryDirective << ' ';
|
|
|
|
if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
|
|
O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
|
|
<< '_' << uid << "_set_" << MBB->getNumber();
|
|
} else if (Subtarget->isPICStyleGOT()) {
|
|
printBasicBlockLabel(MBB, false, false, false);
|
|
O << "@GOTOFF";
|
|
} else
|
|
printBasicBlockLabel(MBB, false, false, false);
|
|
}
|
|
|
|
bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, 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;
|
|
case 'q': // Print DImode register
|
|
Reg = getX86SubSuperRegister(Reg, MVT::i64);
|
|
break;
|
|
}
|
|
|
|
O << '%'<< TRI->getAsmName(Reg);
|
|
return false;
|
|
}
|
|
|
|
/// PrintAsmOperand - Print out an operand for an inline asm expression.
|
|
///
|
|
bool X86ATTAsmPrinter::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.
|
|
|
|
const MachineOperand &MO = MI->getOperand(OpNo);
|
|
|
|
switch (ExtraCode[0]) {
|
|
default: return true; // Unknown modifier.
|
|
case 'a': // This is an address. Currently only 'i' and 'r' are expected.
|
|
if (MO.isImm()) {
|
|
O << MO.getImm();
|
|
return false;
|
|
}
|
|
if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
|
|
printSymbolOperand(MO);
|
|
return false;
|
|
}
|
|
if (MO.isReg()) {
|
|
O << '(';
|
|
printOperand(MI, OpNo);
|
|
O << ')';
|
|
return false;
|
|
}
|
|
return true;
|
|
|
|
case 'c': // Don't print "$" before a global var name or constant.
|
|
if (MO.isImm())
|
|
O << MO.getImm();
|
|
else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
|
|
printSymbolOperand(MO);
|
|
else
|
|
printOperand(MI, OpNo);
|
|
return false;
|
|
|
|
case 'A': // Print '*' before a register (it must be a register)
|
|
if (MO.isReg()) {
|
|
O << '*';
|
|
printOperand(MI, OpNo);
|
|
return false;
|
|
}
|
|
return true;
|
|
|
|
case 'b': // Print QImode register
|
|
case 'h': // Print QImode high register
|
|
case 'w': // Print HImode register
|
|
case 'k': // Print SImode register
|
|
case 'q': // Print DImode register
|
|
if (MO.isReg())
|
|
return printAsmMRegister(MO, ExtraCode[0]);
|
|
printOperand(MI, OpNo);
|
|
return false;
|
|
|
|
case 'P': // This is the operand of a call, treat specially.
|
|
print_pcrel_imm(MI, OpNo);
|
|
return false;
|
|
|
|
case 'n': // Negate the immediate or print a '-' before the operand.
|
|
// Note: this is a temporary solution. It should be handled target
|
|
// independently as part of the 'MC' work.
|
|
if (MO.isImm()) {
|
|
O << -MO.getImm();
|
|
return false;
|
|
}
|
|
O << '-';
|
|
}
|
|
}
|
|
|
|
printOperand(MI, OpNo);
|
|
return false;
|
|
}
|
|
|
|
bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
|
|
unsigned OpNo,
|
|
unsigned AsmVariant,
|
|
const char *ExtraCode) {
|
|
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
|
|
case 'q': // Print SImode register
|
|
// These only apply to registers, ignore on mem.
|
|
break;
|
|
case 'P': // Don't print @PLT, but do print as memory.
|
|
printMemReference(MI, OpNo, "no-rip");
|
|
return false;
|
|
}
|
|
}
|
|
printMemReference(MI, OpNo);
|
|
return false;
|
|
}
|
|
|
|
|
|
|
|
/// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
|
|
/// AT&T syntax to the current output stream.
|
|
///
|
|
void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
|
|
++EmittedInsts;
|
|
|
|
processDebugLoc(MI->getDebugLoc());
|
|
|
|
// Call the autogenerated instruction printer routines.
|
|
if (NewAsmPrinter)
|
|
printInstructionThroughMCStreamer(MI);
|
|
else
|
|
printInstruction(MI);
|
|
|
|
if (VerboseAsm && !MI->getDebugLoc().isUnknown())
|
|
EmitComments(*MI);
|
|
O << '\n';
|
|
}
|
|
|
|
void X86ATTAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
|
|
const TargetData *TD = TM.getTargetData();
|
|
|
|
if (!GVar->hasInitializer())
|
|
return; // External global require no code
|
|
|
|
// Check to see if this is a special global used by LLVM, if so, emit it.
|
|
if (EmitSpecialLLVMGlobal(GVar)) {
|
|
if (Subtarget->isTargetDarwin() &&
|
|
TM.getRelocationModel() == Reloc::Static) {
|
|
if (GVar->getName() == "llvm.global_ctors")
|
|
O << ".reference .constructors_used\n";
|
|
else if (GVar->getName() == "llvm.global_dtors")
|
|
O << ".reference .destructors_used\n";
|
|
}
|
|
return;
|
|
}
|
|
|
|
std::string name = Mang->getMangledName(GVar);
|
|
Constant *C = GVar->getInitializer();
|
|
const Type *Type = C->getType();
|
|
unsigned Size = TD->getTypeAllocSize(Type);
|
|
unsigned Align = TD->getPreferredAlignmentLog(GVar);
|
|
|
|
printVisibility(name, GVar->getVisibility());
|
|
|
|
if (Subtarget->isTargetELF())
|
|
O << "\t.type\t" << name << ",@object\n";
|
|
|
|
|
|
SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
|
|
const MCSection *TheSection =
|
|
getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
|
|
OutStreamer.SwitchSection(TheSection);
|
|
|
|
// FIXME: get this stuff from section kind flags.
|
|
if (C->isNullValue() && !GVar->hasSection() &&
|
|
// Don't put things that should go in the cstring section into "comm".
|
|
!TheSection->getKind().isMergeableCString()) {
|
|
if (GVar->hasExternalLinkage()) {
|
|
if (const char *Directive = MAI->getZeroFillDirective()) {
|
|
O << "\t.globl " << name << '\n';
|
|
O << Directive << "__DATA, __common, " << name << ", "
|
|
<< Size << ", " << Align << '\n';
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (!GVar->isThreadLocal() &&
|
|
(GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
|
|
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
|
|
|
|
if (MAI->getLCOMMDirective() != NULL) {
|
|
if (GVar->hasLocalLinkage()) {
|
|
O << MAI->getLCOMMDirective() << name << ',' << Size;
|
|
if (Subtarget->isTargetDarwin())
|
|
O << ',' << Align;
|
|
} else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
|
|
O << "\t.globl " << name << '\n'
|
|
<< MAI->getWeakDefDirective() << name << '\n';
|
|
EmitAlignment(Align, GVar);
|
|
O << name << ":";
|
|
if (VerboseAsm) {
|
|
O.PadToColumn(MAI->getCommentColumn());
|
|
O << MAI->getCommentString() << ' ';
|
|
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
|
|
}
|
|
O << '\n';
|
|
EmitGlobalConstant(C);
|
|
return;
|
|
} else {
|
|
O << MAI->getCOMMDirective() << name << ',' << Size;
|
|
if (MAI->getCOMMDirectiveTakesAlignment())
|
|
O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
|
|
}
|
|
} else {
|
|
if (!Subtarget->isTargetCygMing()) {
|
|
if (GVar->hasLocalLinkage())
|
|
O << "\t.local\t" << name << '\n';
|
|
}
|
|
O << MAI->getCOMMDirective() << name << ',' << Size;
|
|
if (MAI->getCOMMDirectiveTakesAlignment())
|
|
O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
|
|
}
|
|
if (VerboseAsm) {
|
|
O.PadToColumn(MAI->getCommentColumn());
|
|
O << MAI->getCommentString() << ' ';
|
|
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
|
|
}
|
|
O << '\n';
|
|
return;
|
|
}
|
|
}
|
|
|
|
switch (GVar->getLinkage()) {
|
|
case GlobalValue::CommonLinkage:
|
|
case GlobalValue::LinkOnceAnyLinkage:
|
|
case GlobalValue::LinkOnceODRLinkage:
|
|
case GlobalValue::WeakAnyLinkage:
|
|
case GlobalValue::WeakODRLinkage:
|
|
case GlobalValue::LinkerPrivateLinkage:
|
|
if (Subtarget->isTargetDarwin()) {
|
|
O << "\t.globl " << name << '\n'
|
|
<< MAI->getWeakDefDirective() << name << '\n';
|
|
} else if (Subtarget->isTargetCygMing()) {
|
|
O << "\t.globl\t" << name << "\n"
|
|
"\t.linkonce same_size\n";
|
|
} else {
|
|
O << "\t.weak\t" << name << '\n';
|
|
}
|
|
break;
|
|
case GlobalValue::DLLExportLinkage:
|
|
case GlobalValue::AppendingLinkage:
|
|
// FIXME: appending linkage variables should go into a section of
|
|
// their name or something. For now, just emit them as external.
|
|
case GlobalValue::ExternalLinkage:
|
|
// If external or appending, declare as a global symbol
|
|
O << "\t.globl " << name << '\n';
|
|
// FALL THROUGH
|
|
case GlobalValue::PrivateLinkage:
|
|
case GlobalValue::InternalLinkage:
|
|
break;
|
|
default:
|
|
llvm_unreachable("Unknown linkage type!");
|
|
}
|
|
|
|
EmitAlignment(Align, GVar);
|
|
O << name << ":";
|
|
if (VerboseAsm){
|
|
O.PadToColumn(MAI->getCommentColumn());
|
|
O << MAI->getCommentString() << ' ';
|
|
WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
|
|
}
|
|
O << '\n';
|
|
|
|
EmitGlobalConstant(C);
|
|
|
|
if (MAI->hasDotTypeDotSizeDirective())
|
|
O << "\t.size\t" << name << ", " << Size << '\n';
|
|
}
|
|
|
|
bool X86ATTAsmPrinter::doFinalization(Module &M) {
|
|
// 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->hasDLLExportLinkage())
|
|
DLLExportedGVs.insert(Mang->getMangledName(I));
|
|
}
|
|
|
|
if (Subtarget->isTargetDarwin()) {
|
|
// All darwin targets use mach-o.
|
|
TargetLoweringObjectFileMachO &TLOFMacho =
|
|
static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
|
|
|
|
// Add the (possibly multiple) personalities to the set of global value
|
|
// stubs. Only referenced functions get into the Personalities list.
|
|
if (MAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
|
|
const std::vector<Function*> &Personalities = MMI->getPersonalities();
|
|
for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
|
|
if (Personalities[i] == 0)
|
|
continue;
|
|
|
|
SmallString<128> Name;
|
|
Mang->getNameWithPrefix(Name, Personalities[i], true /*private label*/);
|
|
Name += "$non_lazy_ptr";
|
|
MCSymbol *NLPName = OutContext.GetOrCreateSymbol(Name.str());
|
|
|
|
MCSymbol *&StubName = GVStubs[NLPName];
|
|
if (StubName != 0) continue;
|
|
|
|
|
|
Name.clear();
|
|
Mang->getNameWithPrefix(Name, Personalities[i], false);
|
|
StubName = OutContext.GetOrCreateSymbol(Name.str());
|
|
}
|
|
}
|
|
|
|
// Output stubs for dynamically-linked functions
|
|
if (!FnStubs.empty()) {
|
|
const MCSection *TheSection =
|
|
TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
|
|
MCSectionMachO::S_SYMBOL_STUBS |
|
|
MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
|
|
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
|
|
5, SectionKind::getMetadata());
|
|
OutStreamer.SwitchSection(TheSection);
|
|
// FIXME: This iteration order is unstable!!
|
|
for (DenseMap<MCSymbol*, MCSymbol*>::iterator I = FnStubs.begin(),
|
|
E = FnStubs.end(); I != E; ++I) {
|
|
I->first->print(O, MAI);
|
|
O << ":\n" << "\t.indirect_symbol ";
|
|
// Get the MCSymbol without the $stub suffix.
|
|
I->second->print(O, MAI);
|
|
O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
|
|
}
|
|
O << '\n';
|
|
}
|
|
|
|
// Output stubs for external and common global variables.
|
|
if (!GVStubs.empty()) {
|
|
const MCSection *TheSection =
|
|
TLOFMacho.getMachOSection("__IMPORT", "__pointers",
|
|
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
|
|
SectionKind::getMetadata());
|
|
OutStreamer.SwitchSection(TheSection);
|
|
// FIXME: This iteration order is unstable!!
|
|
for (DenseMap<MCSymbol*, MCSymbol*>::iterator I = GVStubs.begin(),
|
|
E = GVStubs.end(); I != E; ++I) {
|
|
I->first->print(O, MAI);
|
|
O << ":\n\t.indirect_symbol ";
|
|
I->second->print(O, MAI);
|
|
O << "\n\t.long\t0\n";
|
|
}
|
|
}
|
|
|
|
if (!HiddenGVStubs.empty()) {
|
|
OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
|
|
EmitAlignment(2);
|
|
for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
|
|
E = HiddenGVStubs.end(); I != E; ++I)
|
|
O << I->getKeyData() << ":\n" << MAI->getData32bitsDirective()
|
|
<< I->second << '\n';
|
|
}
|
|
|
|
// Funny Darwin hack: This flag tells the linker that no global symbols
|
|
// contain code that falls through to other global symbols (e.g. the obvious
|
|
// implementation of multiple entry points). If this doesn't occur, the
|
|
// linker can safely perform dead code stripping. Since LLVM never
|
|
// generates code that does this, it is always safe to set.
|
|
O << "\t.subsections_via_symbols\n";
|
|
} else if (Subtarget->isTargetCygMing()) {
|
|
// Emit type information for external functions
|
|
for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
|
|
i != e; ++i) {
|
|
O << "\t.def\t " << i->getKeyData()
|
|
<< ";\t.scl\t" << COFF::C_EXT
|
|
<< ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
|
|
<< ";\t.endef\n";
|
|
}
|
|
}
|
|
|
|
|
|
// Output linker support code for dllexported globals on windows.
|
|
if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
|
|
// dllexport symbols only exist on coff targets.
|
|
TargetLoweringObjectFileCOFF &TLOFMacho =
|
|
static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
|
|
|
|
OutStreamer.SwitchSection(TLOFMacho.getCOFFSection(".section .drectve",true,
|
|
SectionKind::getMetadata()));
|
|
|
|
for (StringSet<>::iterator i = DLLExportedGVs.begin(),
|
|
e = DLLExportedGVs.end(); i != e; ++i)
|
|
O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
|
|
|
|
for (StringSet<>::iterator i = DLLExportedFns.begin(),
|
|
e = DLLExportedFns.end();
|
|
i != e; ++i)
|
|
O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
|
|
}
|
|
|
|
// Do common shutdown.
|
|
return AsmPrinter::doFinalization(M);
|
|
}
|
|
|
|
// Include the auto-generated portion of the assembly writer.
|
|
#include "X86GenAsmWriter.inc"
|