forked from OSchip/llvm-project
755 lines
26 KiB
C++
755 lines
26 KiB
C++
//===-- X86AsmPrinter.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 X86 machine code.
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//
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//===----------------------------------------------------------------------===//
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#include "X86AsmPrinter.h"
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#include "InstPrinter/X86ATTInstPrinter.h"
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#include "MCTargetDesc/X86BaseInfo.h"
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#include "X86InstrInfo.h"
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#include "X86MachineFunctionInfo.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineModuleInfoImpls.h"
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#include "llvm/CodeGen/MachineValueType.h"
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSectionCOFF.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/Support/COFF.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Primitive Helper Functions.
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//===----------------------------------------------------------------------===//
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/// runOnMachineFunction - Emit the function body.
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///
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bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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SMShadowTracker.startFunction(MF);
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SetupMachineFunction(MF);
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if (Subtarget->isTargetCOFF()) {
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bool Intrn = MF.getFunction()->hasInternalLinkage();
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OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
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OutStreamer.EmitCOFFSymbolStorageClass(Intrn ? COFF::IMAGE_SYM_CLASS_STATIC
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: COFF::IMAGE_SYM_CLASS_EXTERNAL);
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OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
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<< COFF::SCT_COMPLEX_TYPE_SHIFT);
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OutStreamer.EndCOFFSymbolDef();
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}
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// Have common code print out the function header with linkage info etc.
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EmitFunctionHeader();
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// Emit the rest of the function body.
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EmitFunctionBody();
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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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static void printSymbolOperand(X86AsmPrinter &P, const MachineOperand &MO,
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raw_ostream &O) {
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switch (MO.getType()) {
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default: llvm_unreachable("unknown symbol type!");
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case MachineOperand::MO_ConstantPoolIndex:
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O << *P.GetCPISymbol(MO.getIndex());
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P.printOffset(MO.getOffset(), O);
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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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MCSymbol *GVSym;
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if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
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GVSym = P.getSymbolWithGlobalValueBase(GV, "$stub");
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else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
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MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
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MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
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GVSym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
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else
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GVSym = P.getSymbol(GV);
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// Handle dllimport linkage.
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if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
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GVSym =
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P.OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
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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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MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
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MachineModuleInfoImpl::StubValueTy &StubSym =
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P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
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if (!StubSym.getPointer())
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StubSym = MachineModuleInfoImpl::
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StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
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} else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
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MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
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MachineModuleInfoImpl::StubValueTy &StubSym =
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P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(
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Sym);
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if (!StubSym.getPointer())
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StubSym = MachineModuleInfoImpl::
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StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
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} else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
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MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$stub");
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MachineModuleInfoImpl::StubValueTy &StubSym =
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P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
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if (!StubSym.getPointer())
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StubSym = MachineModuleInfoImpl::
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StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
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}
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// If the name begins with a dollar-sign, enclose it in parens. We do this
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// to avoid having it look like an integer immediate to the assembler.
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if (GVSym->getName()[0] != '$')
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O << *GVSym;
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else
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O << '(' << *GVSym << ')';
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P.printOffset(MO.getOffset(), O);
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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 << " + [.-" << *P.MF->getPICBaseSymbol() << ']';
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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 << '-' << *P.MF->getPICBaseSymbol();
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break;
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case X86II::MO_TLSGD: O << "@TLSGD"; break;
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case X86II::MO_TLSLD: O << "@TLSLD"; break;
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case X86II::MO_TLSLDM: O << "@TLSLDM"; 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_DTPOFF: O << "@DTPOFF"; break;
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case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
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case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; 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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case X86II::MO_TLVP: O << "@TLVP"; break;
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case X86II::MO_TLVP_PIC_BASE:
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O << "@TLVP" << '-' << *P.MF->getPICBaseSymbol();
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break;
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case X86II::MO_SECREL: O << "@SECREL32"; break;
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}
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}
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static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
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unsigned OpNo, raw_ostream &O,
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const char *Modifier = nullptr, unsigned AsmVariant = 0);
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/// printPCRelImm - 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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static void printPCRelImm(X86AsmPrinter &P, const MachineInstr *MI,
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unsigned OpNo, raw_ostream &O) {
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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_Register:
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// pc-relativeness was handled when computing the value in the reg.
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printOperand(P, MI, OpNo, O);
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return;
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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_GlobalAddress:
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printSymbolOperand(P, MO, O);
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return;
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}
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}
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static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
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unsigned OpNo, raw_ostream &O, const char *Modifier,
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unsigned AsmVariant) {
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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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// FIXME: Enumerating AsmVariant, so we can remove magic number.
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if (AsmVariant == 0) 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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MVT::SimpleValueType 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 << X86ATTInstPrinter::getRegisterName(Reg);
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return;
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}
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case MachineOperand::MO_Immediate:
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if (AsmVariant == 0) O << '$';
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O << MO.getImm();
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return;
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case MachineOperand::MO_GlobalAddress: {
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if (AsmVariant == 0) O << '$';
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printSymbolOperand(P, MO, O);
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break;
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}
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}
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}
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static void printLeaMemReference(X86AsmPrinter &P, const MachineInstr *MI,
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unsigned Op, raw_ostream &O,
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const char *Modifier = nullptr) {
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const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg);
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const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
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const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
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// If we really don't want to print out (rip), don't.
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bool HasBaseReg = BaseReg.getReg() != 0;
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if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
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BaseReg.getReg() == X86::RIP)
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HasBaseReg = false;
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// HasParenPart - True if we will print out the () part of the mem ref.
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bool HasParenPart = IndexReg.getReg() || HasBaseReg;
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switch (DispSpec.getType()) {
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default:
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llvm_unreachable("unknown operand type!");
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case MachineOperand::MO_Immediate: {
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int DispVal = DispSpec.getImm();
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if (DispVal || !HasParenPart)
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O << DispVal;
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break;
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}
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ConstantPoolIndex:
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printSymbolOperand(P, DispSpec, O);
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}
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if (Modifier && strcmp(Modifier, "H") == 0)
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O << "+8";
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if (HasParenPart) {
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assert(IndexReg.getReg() != X86::ESP &&
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"X86 doesn't allow scaling by ESP");
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O << '(';
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if (HasBaseReg)
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printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier);
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if (IndexReg.getReg()) {
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O << ',';
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printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier);
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unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
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if (ScaleVal != 1)
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O << ',' << ScaleVal;
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}
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O << ')';
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}
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}
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static void printMemReference(X86AsmPrinter &P, const MachineInstr *MI,
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unsigned Op, raw_ostream &O,
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const char *Modifier = nullptr) {
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assert(isMem(MI, Op) && "Invalid memory reference!");
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const MachineOperand &Segment = MI->getOperand(Op+X86::AddrSegmentReg);
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if (Segment.getReg()) {
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printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier);
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O << ':';
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}
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printLeaMemReference(P, MI, Op, O, Modifier);
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}
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static void printIntelMemReference(X86AsmPrinter &P, const MachineInstr *MI,
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unsigned Op, raw_ostream &O,
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const char *Modifier = nullptr,
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unsigned AsmVariant = 1) {
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const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg);
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unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
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const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
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const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
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const MachineOperand &SegReg = MI->getOperand(Op+X86::AddrSegmentReg);
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// If this has a segment register, print it.
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if (SegReg.getReg()) {
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printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier, AsmVariant);
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O << ':';
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}
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O << '[';
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bool NeedPlus = false;
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if (BaseReg.getReg()) {
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printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier, AsmVariant);
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NeedPlus = true;
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}
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if (IndexReg.getReg()) {
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if (NeedPlus) O << " + ";
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if (ScaleVal != 1)
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O << ScaleVal << '*';
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printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier, AsmVariant);
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NeedPlus = true;
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}
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if (!DispSpec.isImm()) {
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if (NeedPlus) O << " + ";
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printOperand(P, MI, Op+X86::AddrDisp, O, Modifier, AsmVariant);
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} else {
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int64_t DispVal = DispSpec.getImm();
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if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) {
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if (NeedPlus) {
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if (DispVal > 0)
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O << " + ";
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else {
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O << " - ";
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DispVal = -DispVal;
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}
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}
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O << DispVal;
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}
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}
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O << ']';
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}
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static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
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char Mode, raw_ostream &O) {
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unsigned Reg = MO.getReg();
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switch (Mode) {
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default: return true; // Unknown mode.
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case 'b': // Print QImode register
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Reg = getX86SubSuperRegister(Reg, MVT::i8);
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break;
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case 'h': // Print QImode high register
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Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
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break;
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case 'w': // Print HImode register
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Reg = getX86SubSuperRegister(Reg, MVT::i16);
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break;
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case 'k': // Print SImode register
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Reg = getX86SubSuperRegister(Reg, MVT::i32);
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break;
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case 'q':
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// Print 64-bit register names if 64-bit integer registers are available.
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// Otherwise, print 32-bit register names.
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MVT::SimpleValueType Ty = P.getSubtarget().is64Bit() ? MVT::i64 : MVT::i32;
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Reg = getX86SubSuperRegister(Reg, Ty);
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break;
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}
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O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
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return false;
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}
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/// PrintAsmOperand - Print out an operand for an inline asm expression.
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///
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bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode, raw_ostream &O) {
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// Does this asm operand have a single letter operand modifier?
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if (ExtraCode && ExtraCode[0]) {
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if (ExtraCode[1] != 0) return true; // Unknown modifier.
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const MachineOperand &MO = MI->getOperand(OpNo);
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switch (ExtraCode[0]) {
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default:
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// See if this is a generic print operand
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return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
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case 'a': // This is an address. Currently only 'i' and 'r' are expected.
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switch (MO.getType()) {
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default:
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return true;
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case MachineOperand::MO_Immediate:
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O << MO.getImm();
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return false;
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case MachineOperand::MO_ConstantPoolIndex:
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case MachineOperand::MO_JumpTableIndex:
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case MachineOperand::MO_ExternalSymbol:
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llvm_unreachable("unexpected operand type!");
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case MachineOperand::MO_GlobalAddress:
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printSymbolOperand(*this, MO, O);
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if (Subtarget->isPICStyleRIPRel())
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O << "(%rip)";
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return false;
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case MachineOperand::MO_Register:
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O << '(';
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printOperand(*this, MI, OpNo, O);
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O << ')';
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return false;
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}
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case 'c': // Don't print "$" before a global var name or constant.
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switch (MO.getType()) {
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default:
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printOperand(*this, MI, OpNo, O);
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break;
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case MachineOperand::MO_Immediate:
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O << MO.getImm();
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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case MachineOperand::MO_JumpTableIndex:
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case MachineOperand::MO_ExternalSymbol:
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llvm_unreachable("unexpected operand type!");
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case MachineOperand::MO_GlobalAddress:
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printSymbolOperand(*this, MO, O);
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break;
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}
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return false;
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case 'A': // Print '*' before a register (it must be a register)
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if (MO.isReg()) {
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O << '*';
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printOperand(*this, MI, OpNo, O);
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return false;
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}
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return true;
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case 'b': // Print QImode register
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case 'h': // Print QImode high register
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case 'w': // Print HImode register
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case 'k': // Print SImode register
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case 'q': // Print DImode register
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if (MO.isReg())
|
|
return printAsmMRegister(*this, MO, ExtraCode[0], O);
|
|
printOperand(*this, MI, OpNo, O);
|
|
return false;
|
|
|
|
case 'P': // This is the operand of a call, treat specially.
|
|
printPCRelImm(*this, MI, OpNo, O);
|
|
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(*this, MI, OpNo, O, /*Modifier*/ nullptr, AsmVariant);
|
|
return false;
|
|
}
|
|
|
|
bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
|
|
unsigned OpNo, unsigned AsmVariant,
|
|
const char *ExtraCode,
|
|
raw_ostream &O) {
|
|
if (AsmVariant) {
|
|
printIntelMemReference(*this, MI, OpNo, O);
|
|
return false;
|
|
}
|
|
|
|
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 'H':
|
|
printMemReference(*this, MI, OpNo, O, "H");
|
|
return false;
|
|
case 'P': // Don't print @PLT, but do print as memory.
|
|
printMemReference(*this, MI, OpNo, O, "no-rip");
|
|
return false;
|
|
}
|
|
}
|
|
printMemReference(*this, MI, OpNo, O);
|
|
return false;
|
|
}
|
|
|
|
void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
|
|
if (Subtarget->isTargetMacho())
|
|
OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
|
|
|
|
if (Subtarget->isTargetCOFF()) {
|
|
// Emit an absolute @feat.00 symbol. This appears to be some kind of
|
|
// compiler features bitfield read by link.exe.
|
|
if (!Subtarget->is64Bit()) {
|
|
MCSymbol *S = MMI->getContext().GetOrCreateSymbol(StringRef("@feat.00"));
|
|
OutStreamer.BeginCOFFSymbolDef(S);
|
|
OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
|
|
OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
|
|
OutStreamer.EndCOFFSymbolDef();
|
|
// According to the PE-COFF spec, the LSB of this value marks the object
|
|
// for "registered SEH". This means that all SEH handler entry points
|
|
// must be registered in .sxdata. Use of any unregistered handlers will
|
|
// cause the process to terminate immediately. LLVM does not know how to
|
|
// register any SEH handlers, so its object files should be safe.
|
|
S->setAbsolute();
|
|
OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
|
|
OutStreamer.EmitAssignment(
|
|
S, MCConstantExpr::Create(int64_t(1), MMI->getContext()));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
emitNonLazySymbolPointer(MCStreamer &OutStreamer, MCSymbol *StubLabel,
|
|
MachineModuleInfoImpl::StubValueTy &MCSym) {
|
|
// L_foo$stub:
|
|
OutStreamer.EmitLabel(StubLabel);
|
|
// .indirect_symbol _foo
|
|
OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
|
|
|
|
if (MCSym.getInt())
|
|
// External to current translation unit.
|
|
OutStreamer.EmitIntValue(0, 4/*size*/);
|
|
else
|
|
// Internal to current translation unit.
|
|
//
|
|
// When we place the LSDA into the TEXT section, the type info
|
|
// pointers need to be indirect and pc-rel. We accomplish this by
|
|
// using NLPs; however, sometimes the types are local to the file.
|
|
// We need to fill in the value for the NLP in those cases.
|
|
OutStreamer.EmitValue(
|
|
MCSymbolRefExpr::Create(MCSym.getPointer(), OutStreamer.getContext()),
|
|
4 /*size*/);
|
|
}
|
|
|
|
MCSymbol *X86AsmPrinter::GetCPISymbol(unsigned CPID) const {
|
|
if (Subtarget->isTargetKnownWindowsMSVC()) {
|
|
const MachineConstantPoolEntry &CPE =
|
|
MF->getConstantPool()->getConstants()[CPID];
|
|
if (!CPE.isMachineConstantPoolEntry()) {
|
|
SectionKind Kind =
|
|
CPE.getSectionKind(TM.getSubtargetImpl()->getDataLayout());
|
|
const Constant *C = CPE.Val.ConstVal;
|
|
if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
|
|
getObjFileLowering().getSectionForConstant(Kind, C))) {
|
|
if (MCSymbol *Sym = S->getCOMDATSymbol()) {
|
|
if (Sym->isUndefined())
|
|
OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
|
|
return Sym;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return AsmPrinter::GetCPISymbol(CPID);
|
|
}
|
|
|
|
void X86AsmPrinter::GenerateExportDirective(const MCSymbol *Sym, bool IsData) {
|
|
SmallString<128> Directive;
|
|
raw_svector_ostream OS(Directive);
|
|
StringRef Name = Sym->getName();
|
|
|
|
if (Subtarget->isTargetKnownWindowsMSVC())
|
|
OS << " /EXPORT:";
|
|
else
|
|
OS << " -export:";
|
|
|
|
if ((Subtarget->isTargetWindowsGNU() || Subtarget->isTargetWindowsCygwin()) &&
|
|
(Name[0] == getDataLayout().getGlobalPrefix()))
|
|
Name = Name.drop_front();
|
|
|
|
OS << Name;
|
|
|
|
if (IsData) {
|
|
if (Subtarget->isTargetKnownWindowsMSVC())
|
|
OS << ",DATA";
|
|
else
|
|
OS << ",data";
|
|
}
|
|
|
|
OS.flush();
|
|
OutStreamer.EmitBytes(Directive);
|
|
}
|
|
|
|
void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
|
|
if (Subtarget->isTargetMacho()) {
|
|
// All darwin targets use mach-o.
|
|
MachineModuleInfoMachO &MMIMacho =
|
|
MMI->getObjFileInfo<MachineModuleInfoMachO>();
|
|
|
|
// Output stubs for dynamically-linked functions.
|
|
MachineModuleInfoMachO::SymbolListTy Stubs;
|
|
|
|
Stubs = MMIMacho.GetFnStubList();
|
|
if (!Stubs.empty()) {
|
|
const MCSection *TheSection =
|
|
OutContext.getMachOSection("__IMPORT", "__jump_table",
|
|
MachO::S_SYMBOL_STUBS |
|
|
MachO::S_ATTR_SELF_MODIFYING_CODE |
|
|
MachO::S_ATTR_PURE_INSTRUCTIONS,
|
|
5, SectionKind::getMetadata());
|
|
OutStreamer.SwitchSection(TheSection);
|
|
|
|
for (const auto &Stub : Stubs) {
|
|
// L_foo$stub:
|
|
OutStreamer.EmitLabel(Stub.first);
|
|
// .indirect_symbol _foo
|
|
OutStreamer.EmitSymbolAttribute(Stub.second.getPointer(),
|
|
MCSA_IndirectSymbol);
|
|
// hlt; hlt; hlt; hlt; hlt hlt = 0xf4.
|
|
const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4";
|
|
OutStreamer.EmitBytes(StringRef(HltInsts, 5));
|
|
}
|
|
|
|
Stubs.clear();
|
|
OutStreamer.AddBlankLine();
|
|
}
|
|
|
|
// Output stubs for external and common global variables.
|
|
Stubs = MMIMacho.GetGVStubList();
|
|
if (!Stubs.empty()) {
|
|
const MCSection *TheSection =
|
|
OutContext.getMachOSection("__IMPORT", "__pointers",
|
|
MachO::S_NON_LAZY_SYMBOL_POINTERS,
|
|
SectionKind::getMetadata());
|
|
OutStreamer.SwitchSection(TheSection);
|
|
|
|
for (auto &Stub : Stubs)
|
|
emitNonLazySymbolPointer(OutStreamer, Stub.first, Stub.second);
|
|
|
|
Stubs.clear();
|
|
OutStreamer.AddBlankLine();
|
|
}
|
|
|
|
Stubs = MMIMacho.GetHiddenGVStubList();
|
|
if (!Stubs.empty()) {
|
|
const MCSection *TheSection =
|
|
OutContext.getMachOSection("__IMPORT", "__pointers",
|
|
MachO::S_NON_LAZY_SYMBOL_POINTERS,
|
|
SectionKind::getMetadata());
|
|
OutStreamer.SwitchSection(TheSection);
|
|
|
|
for (auto &Stub : Stubs)
|
|
emitNonLazySymbolPointer(OutStreamer, Stub.first, Stub.second);
|
|
|
|
Stubs.clear();
|
|
OutStreamer.AddBlankLine();
|
|
}
|
|
|
|
SM.serializeToStackMapSection();
|
|
|
|
// 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.
|
|
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
|
|
}
|
|
|
|
if (Subtarget->isTargetKnownWindowsMSVC() && MMI->usesVAFloatArgument()) {
|
|
StringRef SymbolName = Subtarget->is64Bit() ? "_fltused" : "__fltused";
|
|
MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName);
|
|
OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
|
|
}
|
|
|
|
if (Subtarget->isTargetCOFF()) {
|
|
// Necessary for dllexport support
|
|
std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
|
|
|
|
for (const auto &Function : M)
|
|
if (Function.hasDLLExportStorageClass())
|
|
DLLExportedFns.push_back(getSymbol(&Function));
|
|
|
|
for (const auto &Global : M.globals())
|
|
if (Global.hasDLLExportStorageClass())
|
|
DLLExportedGlobals.push_back(getSymbol(&Global));
|
|
|
|
for (const auto &Alias : M.aliases()) {
|
|
if (!Alias.hasDLLExportStorageClass())
|
|
continue;
|
|
|
|
if (Alias.getType()->getElementType()->isFunctionTy())
|
|
DLLExportedFns.push_back(getSymbol(&Alias));
|
|
else
|
|
DLLExportedGlobals.push_back(getSymbol(&Alias));
|
|
}
|
|
|
|
// Output linker support code for dllexported globals on windows.
|
|
if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
|
|
const TargetLoweringObjectFileCOFF &TLOFCOFF =
|
|
static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
|
|
|
|
OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection());
|
|
|
|
for (auto & Symbol : DLLExportedGlobals)
|
|
GenerateExportDirective(Symbol, /*IsData=*/true);
|
|
for (auto & Symbol : DLLExportedFns)
|
|
GenerateExportDirective(Symbol, /*IsData=*/false);
|
|
}
|
|
}
|
|
|
|
if (Subtarget->isTargetELF()) {
|
|
const TargetLoweringObjectFileELF &TLOFELF =
|
|
static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
|
|
|
|
MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
|
|
|
|
// Output stubs for external and common global variables.
|
|
MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
|
|
if (!Stubs.empty()) {
|
|
OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
|
|
const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
|
|
|
|
for (const auto &Stub : Stubs) {
|
|
OutStreamer.EmitLabel(Stub.first);
|
|
OutStreamer.EmitSymbolValue(Stub.second.getPointer(),
|
|
TD->getPointerSize());
|
|
}
|
|
Stubs.clear();
|
|
}
|
|
|
|
SM.serializeToStackMapSection();
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Target Registry Stuff
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// Force static initialization.
|
|
extern "C" void LLVMInitializeX86AsmPrinter() {
|
|
RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
|
|
RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);
|
|
}
|