split mcinst lowering stuff out to its own file.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80806 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
new file mode 100644
index 0000000..09e4937
--- /dev/null
+++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
@@ -0,0 +1,283 @@
+//===-- X86MCInstLower.cpp - Convert X86 MachineInstr to an MCInst --------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains code to lower X86 MachineInstrs to their corresponding
+// MCInst records.
+//
+//===----------------------------------------------------------------------===//
+
+
+#include "X86ATTAsmPrinter.h"
+#include "X86MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h" // fixme, kill utostr.
+
+using namespace llvm;
+
+MCSymbol *X86ATTAsmPrinter::GetPICBaseSymbol() {
+ // FIXME: the actual label generated doesn't matter here! Just mangle in
+ // something unique (the function number) with Private prefix.
+ std::string Name;
+
+ if (Subtarget->isTargetDarwin()) {
+ Name = "L" + utostr(getFunctionNumber())+"$pb";
+ } else {
+ assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
+ Name = ".Lllvm$" + utostr(getFunctionNumber())+".$piclabel";
+ }
+ return OutContext.GetOrCreateSymbol(Name);
+}
+
+
+
+static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
+ // Convert registers in the addr mode according to subreg64.
+ for (unsigned i = 0; i != 4; ++i) {
+ if (!MI->getOperand(i).isReg()) continue;
+
+ unsigned Reg = MI->getOperand(i).getReg();
+ if (Reg == 0) continue;
+
+ MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
+ }
+}
+
+/// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
+/// MCOperand.
+MCOperand X86ATTAsmPrinter::LowerGlobalAddressOperand(const MachineOperand &MO){
+ const GlobalValue *GV = MO.getGlobal();
+
+ const char *Suffix = "";
+ if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
+ Suffix = "$stub";
+ else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
+ MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
+ MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
+ MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
+ Suffix = "$non_lazy_ptr";
+
+ std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
+ if (Subtarget->isTargetCygMing())
+ DecorateCygMingName(Name, GV);
+
+ // Handle dllimport linkage.
+ if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
+ Name = "__imp_" + Name;
+
+ if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
+ MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE)
+ GVStubs[Name] = Mang->getMangledName(GV);
+ else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
+ MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
+ HiddenGVStubs[Name] = Mang->getMangledName(GV);
+ else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
+ FnStubs[Name] = Mang->getMangledName(GV);
+
+
+ // Handle target operand flags.
+ // FIXME: This should be common between external symbols, constant pool etc.
+ MCSymbol *NegatedSymbol = 0;
+
+ switch (MO.getTargetFlags()) {
+ default:
+ llvm_unreachable("Unknown target flag on GV operand");
+ case X86II::MO_NO_FLAG: // No flag.
+ break;
+ case X86II::MO_DARWIN_NONLAZY:
+ case X86II::MO_DARWIN_HIDDEN_NONLAZY:
+ case X86II::MO_DLLIMPORT:
+ case X86II::MO_DARWIN_STUB:
+ // These affect the name of the symbol, not any suffix.
+ break;
+ case X86II::MO_GOT_ABSOLUTE_ADDRESS:
+ assert(0 && "Reloc mode unimp!");
+ //O << " + [.-";
+ //PrintPICBaseSymbol();
+ //O << ']';
+ break;
+ case X86II::MO_PIC_BASE_OFFSET:
+ case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
+ case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
+ // Subtract the pic base.
+ NegatedSymbol = GetPICBaseSymbol();
+ break;
+
+ // FIXME: These probably should be a modifier on the symbol or something??
+ case X86II::MO_TLSGD: Name += "@TLSGD"; break;
+ case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
+ case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
+ case X86II::MO_TPOFF: Name += "@TPOFF"; break;
+ case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
+ case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
+ case X86II::MO_GOT: Name += "@GOT"; break;
+ case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
+ case X86II::MO_PLT: Name += "@PLT"; break;
+ }
+
+ // Create a symbol for the name.
+ MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name);
+ // FIXME: We would like an efficient form for this, so we don't have to do a
+ // lot of extra uniquing.
+ const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
+ if (NegatedSymbol)
+ Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(NegatedSymbol,
+ OutContext),
+ OutContext);
+ if (MO.getOffset())
+ Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
+ OutContext),
+ OutContext);
+ return MCOperand::CreateExpr(Expr);
+}
+
+MCOperand X86ATTAsmPrinter::
+LowerExternalSymbolOperand(const MachineOperand &MO) {
+ std::string Name = Mang->makeNameProper(MO.getSymbolName());
+ if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
+ FnStubs[Name+"$stub"] = Name;
+ Name += "$stub";
+ }
+
+ MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name);
+ // FIXME: We would like an efficient form for this, so we don't have to do a
+ // lot of extra uniquing.
+ const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
+ if (MO.getOffset())
+ Expr = MCBinaryExpr::CreateAdd(Expr,
+ MCConstantExpr::Create(MO.getOffset(),
+ OutContext),
+ OutContext);
+ return MCOperand::CreateExpr(Expr);
+}
+
+MCOperand X86ATTAsmPrinter::LowerJumpTableOperand(const MachineOperand &MO) {
+ SmallString<256> Name;
+ raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
+ << getFunctionNumber() << '_' << MO.getIndex();
+
+ MCSymbol *NegatedSymbol = 0;
+ switch (MO.getTargetFlags()) {
+ default:
+ llvm_unreachable("Unknown target flag on GV operand");
+ case X86II::MO_PIC_BASE_OFFSET:
+ case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
+ case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
+ // Subtract the pic base.
+ NegatedSymbol = GetPICBaseSymbol();
+ break;
+ }
+
+ // Create a symbol for the name.
+ MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
+ // FIXME: We would like an efficient form for this, so we don't have to do a
+ // lot of extra uniquing.
+ const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext);
+ if (NegatedSymbol)
+ Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(NegatedSymbol,
+ OutContext),
+ OutContext);
+ return MCOperand::CreateExpr(Expr);
+}
+
+
+void X86ATTAsmPrinter::
+printInstructionThroughMCStreamer(const MachineInstr *MI) {
+
+ MCInst TmpInst;
+
+ switch (MI->getOpcode()) {
+ case TargetInstrInfo::DBG_LABEL:
+ case TargetInstrInfo::EH_LABEL:
+ case TargetInstrInfo::GC_LABEL:
+ printLabel(MI);
+ return;
+ case TargetInstrInfo::INLINEASM:
+ O << '\t';
+ printInlineAsm(MI);
+ return;
+ case TargetInstrInfo::IMPLICIT_DEF:
+ printImplicitDef(MI);
+ return;
+ case X86::MOVPC32r: {
+ // This is a pseudo op for a two instruction sequence with a label, which
+ // looks like:
+ // call "L1$pb"
+ // "L1$pb":
+ // popl %esi
+
+ // Emit the call.
+ MCSymbol *PICBase = GetPICBaseSymbol();
+ TmpInst.setOpcode(X86::CALLpcrel32);
+ // FIXME: We would like an efficient form for this, so we don't have to do a
+ // lot of extra uniquing.
+ TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
+ OutContext)));
+ printInstruction(&TmpInst);
+
+ // Emit the label.
+ OutStreamer.EmitLabel(PICBase);
+
+ // popl $reg
+ TmpInst.setOpcode(X86::POP32r);
+ TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
+ printInstruction(&TmpInst);
+ return;
+ }
+ }
+
+ TmpInst.setOpcode(MI->getOpcode());
+
+ for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = MI->getOperand(i);
+
+ MCOperand MCOp;
+ switch (MO.getType()) {
+ default:
+ O.flush();
+ errs() << "Cannot lower operand #" << i << " of :" << *MI;
+ llvm_unreachable("Unimp");
+ case MachineOperand::MO_JumpTableIndex:
+ MCOp = LowerJumpTableOperand(MO);
+ break;
+ case MachineOperand::MO_Register:
+ MCOp = MCOperand::CreateReg(MO.getReg());
+ break;
+ case MachineOperand::MO_Immediate:
+ MCOp = MCOperand::CreateImm(MO.getImm());
+ break;
+ case MachineOperand::MO_MachineBasicBlock:
+ MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(),
+ MO.getMBB()->getNumber());
+ break;
+ case MachineOperand::MO_GlobalAddress:
+ MCOp = LowerGlobalAddressOperand(MO);
+ break;
+ case MachineOperand::MO_ExternalSymbol:
+ MCOp = LowerExternalSymbolOperand(MO);
+ break;
+ }
+
+ TmpInst.addOperand(MCOp);
+ }
+
+ switch (TmpInst.getOpcode()) {
+ case X86::LEA64_32r:
+ // Handle the 'subreg rewriting' for the lea64_32mem operand.
+ lower_lea64_32mem(&TmpInst, 1);
+ break;
+ }
+
+ printInstruction(&TmpInst);
+}