2009-10-19 20:21:05 +00:00
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//===-- ARMMCInstLower.cpp - Convert ARM MachineInstr to an MCInst --------===//
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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 code to lower ARM MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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2010-11-14 20:31:06 +00:00
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#include "ARM.h"
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2009-10-20 00:52:47 +00:00
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#include "llvm/CodeGen/AsmPrinter.h"
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2010-09-15 18:47:08 +00:00
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#include "llvm/Constants.h"
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2009-10-20 00:52:47 +00:00
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#include "llvm/CodeGen/MachineBasicBlock.h"
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add jump tables, constant pools and some trivial global
lowering stuff. We can now compile hello world to:
_main:
stm ,
mov r7, sp
sub sp, sp, #4
mov r0, #0
str r0,
ldr r0,
bl _printf
ldr r0,
mov sp, r7
ldm ,
Almost looks like arm code :)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84542 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-19 21:53:00 +00:00
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#include "llvm/MC/MCExpr.h"
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2009-10-19 20:21:05 +00:00
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#include "llvm/MC/MCInst.h"
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2010-03-12 21:19:23 +00:00
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#include "llvm/Target/Mangler.h"
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2009-10-19 20:21:05 +00:00
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using namespace llvm;
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2010-11-14 20:58:38 +00:00
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static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
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AsmPrinter &Printer) {
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MCContext &Ctx = Printer.OutContext;
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2010-11-14 20:40:08 +00:00
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const MCExpr *Expr;
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2009-10-20 00:56:16 +00:00
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switch (MO.getTargetFlags()) {
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2010-11-14 20:40:08 +00:00
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default: assert(0 && "Unknown target flag on symbol operand");
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2010-09-22 23:27:36 +00:00
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case 0:
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2010-11-14 20:40:08 +00:00
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Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
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2010-09-22 23:27:36 +00:00
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break;
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case ARMII::MO_LO16:
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2010-11-14 20:40:08 +00:00
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Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
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2010-09-22 23:27:36 +00:00
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break;
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case ARMII::MO_HI16:
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2010-11-14 20:40:08 +00:00
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Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_HI16, Ctx);
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2010-09-22 23:27:36 +00:00
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break;
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case ARMII::MO_PLT:
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2010-11-14 20:40:08 +00:00
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Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_PLT, Ctx);
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2010-09-22 23:27:36 +00:00
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break;
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2009-10-20 00:56:16 +00:00
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}
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2010-11-30 23:29:24 +00:00
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2010-09-17 18:25:25 +00:00
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if (!MO.isJTI() && MO.getOffset())
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Expr = MCBinaryExpr::CreateAdd(Expr,
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MCConstantExpr::Create(MO.getOffset(), Ctx),
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Ctx);
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return MCOperand::CreateExpr(Expr);
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2010-11-30 23:29:24 +00:00
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2010-09-17 18:25:25 +00:00
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}
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2010-11-14 21:00:02 +00:00
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void llvm::LowerARMMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
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2010-11-14 21:16:04 +00:00
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AsmPrinter &AP) {
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2009-10-19 20:21:05 +00:00
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OutMI.setOpcode(MI->getOpcode());
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2010-09-13 18:25:42 +00:00
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2009-10-19 20:21:05 +00:00
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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2010-09-13 18:25:42 +00:00
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2009-10-19 20:21:05 +00:00
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MCOperand MCOp;
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switch (MO.getType()) {
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default:
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MI->dump();
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assert(0 && "unknown operand type");
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case MachineOperand::MO_Register:
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2010-09-14 20:41:27 +00:00
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// Ignore all non-CPSR implicit register operands.
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if (MO.isImplicit() && MO.getReg() != ARM::CPSR) continue;
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2009-11-07 15:20:32 +00:00
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assert(!MO.getSubReg() && "Subregs should be eliminated!");
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2009-10-19 20:21:05 +00:00
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MCOp = MCOperand::CreateReg(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::CreateImm(MO.getImm());
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break;
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case MachineOperand::MO_MachineBasicBlock:
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MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
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2010-11-14 20:58:38 +00:00
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MO.getMBB()->getSymbol(), AP.OutContext));
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2009-10-19 20:21:05 +00:00
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break;
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case MachineOperand::MO_GlobalAddress:
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2010-11-14 20:58:38 +00:00
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MCOp = GetSymbolRef(MO, AP.Mang->getSymbol(MO.getGlobal()), AP);
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2009-10-19 20:21:05 +00:00
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break;
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case MachineOperand::MO_ExternalSymbol:
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2010-11-30 23:29:24 +00:00
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MCOp = GetSymbolRef(MO,
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2010-11-14 20:58:38 +00:00
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AP.GetExternalSymbolSymbol(MO.getSymbolName()), AP);
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2009-10-19 20:21:05 +00:00
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break;
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case MachineOperand::MO_JumpTableIndex:
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2010-11-14 20:58:38 +00:00
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MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
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2009-10-19 20:21:05 +00:00
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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2010-11-14 20:58:38 +00:00
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MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
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2009-10-19 20:21:05 +00:00
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break;
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2009-10-30 05:45:42 +00:00
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case MachineOperand::MO_BlockAddress:
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2010-11-14 20:58:38 +00:00
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MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP);
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2009-10-30 05:45:42 +00:00
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break;
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2010-09-15 18:47:08 +00:00
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case MachineOperand::MO_FPImmediate:
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2010-09-16 17:37:30 +00:00
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APFloat Val = MO.getFPImm()->getValueAPF();
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bool ignored;
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Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
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MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
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2010-09-15 18:47:08 +00:00
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break;
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2009-10-19 20:21:05 +00:00
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}
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2010-09-13 18:25:42 +00:00
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2009-10-19 20:21:05 +00:00
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OutMI.addOperand(MCOp);
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}
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}
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