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instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81677 91177308-0d34-0410-b5e6-96231b3b80d8
532 lines
17 KiB
C++
532 lines
17 KiB
C++
//===-- MipsAsmPrinter.cpp - Mips LLVM assembly writer --------------------===//
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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 GAS-format MIPS assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "mips-asm-printer"
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#include "Mips.h"
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#include "MipsSubtarget.h"
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#include "MipsInstrInfo.h"
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#include "MipsTargetMachine.h"
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#include "MipsMachineFunction.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/DwarfWriter.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/MathExtras.h"
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#include <cctype>
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using namespace llvm;
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STATISTIC(EmittedInsts, "Number of machine instrs printed");
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namespace {
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class VISIBILITY_HIDDEN MipsAsmPrinter : public AsmPrinter {
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const MipsSubtarget *Subtarget;
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public:
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explicit MipsAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
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const MCAsmInfo *T, bool V)
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: AsmPrinter(O, TM, T, V) {
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Subtarget = &TM.getSubtarget<MipsSubtarget>();
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}
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virtual const char *getPassName() const {
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return "Mips Assembly Printer";
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}
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode);
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void printOperand(const MachineInstr *MI, int opNum);
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void printUnsignedImm(const MachineInstr *MI, int opNum);
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void printMemOperand(const MachineInstr *MI, int opNum,
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const char *Modifier = 0);
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void printFCCOperand(const MachineInstr *MI, int opNum,
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const char *Modifier = 0);
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void PrintGlobalVariable(const GlobalVariable *GVar);
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void printSavedRegsBitmask(MachineFunction &MF);
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void printHex32(unsigned int Value);
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const char *emitCurrentABIString();
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void emitFunctionStart(MachineFunction &MF);
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void emitFunctionEnd(MachineFunction &MF);
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void emitFrameDirective(MachineFunction &MF);
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void printInstruction(const MachineInstr *MI); // autogenerated.
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bool runOnMachineFunction(MachineFunction &F);
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bool doInitialization(Module &M);
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};
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} // end of anonymous namespace
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#include "MipsGenAsmWriter.inc"
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//===----------------------------------------------------------------------===//
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//
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// Mips Asm Directives
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//
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// -- Frame directive "frame Stackpointer, Stacksize, RARegister"
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// Describe the stack frame.
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//
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// -- Mask directives "(f)mask bitmask, offset"
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// Tells the assembler which registers are saved and where.
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// bitmask - contain a little endian bitset indicating which registers are
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// saved on function prologue (e.g. with a 0x80000000 mask, the
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// assembler knows the register 31 (RA) is saved at prologue.
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// offset - the position before stack pointer subtraction indicating where
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// the first saved register on prologue is located. (e.g. with a
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//
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// Consider the following function prologue:
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//
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// .frame $fp,48,$ra
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// .mask 0xc0000000,-8
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// addiu $sp, $sp, -48
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// sw $ra, 40($sp)
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// sw $fp, 36($sp)
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//
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// With a 0xc0000000 mask, the assembler knows the register 31 (RA) and
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// 30 (FP) are saved at prologue. As the save order on prologue is from
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// left to right, RA is saved first. A -8 offset means that after the
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// stack pointer subtration, the first register in the mask (RA) will be
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// saved at address 48-8=40.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// Mask directives
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//===----------------------------------------------------------------------===//
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// Create a bitmask with all callee saved registers for CPU or Floating Point
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// registers. For CPU registers consider RA, GP and FP for saving if necessary.
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void MipsAsmPrinter::
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printSavedRegsBitmask(MachineFunction &MF)
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{
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const TargetRegisterInfo &RI = *TM.getRegisterInfo();
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MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
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// CPU and FPU Saved Registers Bitmasks
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unsigned int CPUBitmask = 0;
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unsigned int FPUBitmask = 0;
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// Set the CPU and FPU Bitmasks
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MachineFrameInfo *MFI = MF.getFrameInfo();
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const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
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for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
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unsigned RegNum = MipsRegisterInfo::getRegisterNumbering(CSI[i].getReg());
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if (CSI[i].getRegClass() == Mips::CPURegsRegisterClass)
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CPUBitmask |= (1 << RegNum);
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else
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FPUBitmask |= (1 << RegNum);
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}
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// Return Address and Frame registers must also be set in CPUBitmask.
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if (RI.hasFP(MF))
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CPUBitmask |= (1 << MipsRegisterInfo::
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getRegisterNumbering(RI.getFrameRegister(MF)));
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if (MF.getFrameInfo()->hasCalls())
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CPUBitmask |= (1 << MipsRegisterInfo::
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getRegisterNumbering(RI.getRARegister()));
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// Print CPUBitmask
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O << "\t.mask \t"; printHex32(CPUBitmask); O << ','
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<< MipsFI->getCPUTopSavedRegOff() << '\n';
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// Print FPUBitmask
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O << "\t.fmask\t"; printHex32(FPUBitmask); O << ","
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<< MipsFI->getFPUTopSavedRegOff() << '\n';
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}
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// Print a 32 bit hex number with all numbers.
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void MipsAsmPrinter::
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printHex32(unsigned int Value)
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{
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O << "0x";
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for (int i = 7; i >= 0; i--)
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O << utohexstr( (Value & (0xF << (i*4))) >> (i*4) );
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}
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//===----------------------------------------------------------------------===//
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// Frame and Set directives
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//===----------------------------------------------------------------------===//
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/// Frame Directive
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void MipsAsmPrinter::emitFrameDirective(MachineFunction &MF) {
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const TargetRegisterInfo &RI = *TM.getRegisterInfo();
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unsigned stackReg = RI.getFrameRegister(MF);
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unsigned returnReg = RI.getRARegister();
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unsigned stackSize = MF.getFrameInfo()->getStackSize();
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O << "\t.frame\t" << '$' << LowercaseString(RI.get(stackReg).AsmName)
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<< ',' << stackSize << ','
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<< '$' << LowercaseString(RI.get(returnReg).AsmName)
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<< '\n';
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}
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/// Emit Set directives.
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const char *MipsAsmPrinter::emitCurrentABIString() {
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switch(Subtarget->getTargetABI()) {
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case MipsSubtarget::O32: return "abi32";
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case MipsSubtarget::O64: return "abiO64";
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case MipsSubtarget::N32: return "abiN32";
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case MipsSubtarget::N64: return "abi64";
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case MipsSubtarget::EABI: return "eabi32"; // TODO: handle eabi64
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default: break;
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}
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llvm_unreachable("Unknown Mips ABI");
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return NULL;
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}
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/// Emit the directives used by GAS on the start of functions
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void MipsAsmPrinter::emitFunctionStart(MachineFunction &MF) {
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// Print out the label for the function.
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const Function *F = MF.getFunction();
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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
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// 2 bits aligned
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EmitAlignment(MF.getAlignment(), F);
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O << "\t.globl\t" << CurrentFnName << '\n';
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O << "\t.ent\t" << CurrentFnName << '\n';
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printVisibility(CurrentFnName, F->getVisibility());
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if ((MAI->hasDotTypeDotSizeDirective()) && Subtarget->isLinux())
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O << "\t.type\t" << CurrentFnName << ", @function\n";
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O << CurrentFnName << ":\n";
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emitFrameDirective(MF);
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printSavedRegsBitmask(MF);
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O << '\n';
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}
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/// Emit the directives used by GAS on the end of functions
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void MipsAsmPrinter::emitFunctionEnd(MachineFunction &MF) {
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// There are instruction for this macros, but they must
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// always be at the function end, and we can't emit and
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// break with BB logic.
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O << "\t.set\tmacro\n";
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O << "\t.set\treorder\n";
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O << "\t.end\t" << CurrentFnName << '\n';
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if (MAI->hasDotTypeDotSizeDirective() && !Subtarget->isLinux())
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O << "\t.size\t" << CurrentFnName << ", .-" << 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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bool MipsAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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this->MF = &MF;
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SetupMachineFunction(MF);
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// Print out constants referenced by the function
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EmitConstantPool(MF.getConstantPool());
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// Print out jump tables referenced by the function
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EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
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O << "\n\n";
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// Emit the function start directives
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emitFunctionStart(MF);
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// Print out code for the function.
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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 (I != MF.begin()) {
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printBasicBlockLabel(I, true, true);
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O << '\n';
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}
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for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
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II != E; ++II) {
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processDebugLoc(II->getDebugLoc());
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// Print the assembly for the instruction.
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printInstruction(II);
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if (VerboseAsm && !II->getDebugLoc().isUnknown())
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EmitComments(*II);
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O << '\n';
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++EmittedInsts;
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}
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// Each Basic Block is separated by a newline
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O << '\n';
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}
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// Emit function end directives
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emitFunctionEnd(MF);
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// We didn't modify anything.
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return false;
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}
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// Print out an operand for an inline asm expression.
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bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,const char *ExtraCode){
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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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return true; // Unknown modifier.
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printOperand(MI, OpNo);
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return false;
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}
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void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
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const MachineOperand &MO = MI->getOperand(opNum);
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const TargetRegisterInfo &RI = *TM.getRegisterInfo();
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bool closeP = false;
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if (MO.getTargetFlags())
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closeP = true;
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switch(MO.getTargetFlags()) {
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case MipsII::MO_GPREL: O << "%gp_rel("; break;
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case MipsII::MO_GOT_CALL: O << "%call16("; break;
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case MipsII::MO_GOT:
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if (MI->getOpcode() == Mips::LW)
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O << "%got(";
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else
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O << "%lo(";
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break;
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case MipsII::MO_ABS_HILO:
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if (MI->getOpcode() == Mips::LUi)
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O << "%hi(";
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else
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O << "%lo(";
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break;
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}
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switch (MO.getType())
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{
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case MachineOperand::MO_Register:
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if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
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O << '$' << LowercaseString (RI.get(MO.getReg()).AsmName);
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else
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O << '$' << MO.getReg();
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break;
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case MachineOperand::MO_Immediate:
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O << (short int)MO.getImm();
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break;
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case MachineOperand::MO_MachineBasicBlock:
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GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
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return;
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case MachineOperand::MO_GlobalAddress:
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O << Mang->getMangledName(MO.getGlobal());
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break;
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case MachineOperand::MO_ExternalSymbol:
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O << MO.getSymbolName();
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break;
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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"
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<< getFunctionNumber() << "_" << MO.getIndex();
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break;
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default:
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llvm_unreachable("<unknown operand type>");
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}
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if (closeP) O << ")";
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}
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void MipsAsmPrinter::printUnsignedImm(const MachineInstr *MI, int opNum) {
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const MachineOperand &MO = MI->getOperand(opNum);
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if (MO.getType() == MachineOperand::MO_Immediate)
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O << (unsigned short int)MO.getImm();
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else
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printOperand(MI, opNum);
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}
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void MipsAsmPrinter::
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printMemOperand(const MachineInstr *MI, int opNum, const char *Modifier) {
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// when using stack locations for not load/store instructions
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// print the same way as all normal 3 operand instructions.
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if (Modifier && !strcmp(Modifier, "stackloc")) {
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printOperand(MI, opNum+1);
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O << ", ";
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printOperand(MI, opNum);
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return;
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}
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// Load/Store memory operands -- imm($reg)
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// If PIC target the target is loaded as the
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// pattern lw $25,%call16($28)
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printOperand(MI, opNum);
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O << "(";
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printOperand(MI, opNum+1);
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O << ")";
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}
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void MipsAsmPrinter::
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printFCCOperand(const MachineInstr *MI, int opNum, const char *Modifier) {
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const MachineOperand& MO = MI->getOperand(opNum);
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O << Mips::MipsFCCToString((Mips::CondCode)MO.getImm());
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}
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bool MipsAsmPrinter::doInitialization(Module &M) {
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// FIXME: Use SwitchSection.
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// Tell the assembler which ABI we are using
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O << "\t.section .mdebug." << emitCurrentABIString() << '\n';
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// TODO: handle O64 ABI
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if (Subtarget->isABI_EABI())
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O << "\t.section .gcc_compiled_long" <<
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(Subtarget->isGP32bit() ? "32" : "64") << '\n';
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// return to previous section
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O << "\t.previous" << '\n';
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return AsmPrinter::doInitialization(M);
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}
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void MipsAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
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const TargetData *TD = TM.getTargetData();
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if (!GVar->hasInitializer())
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return; // External global require no code
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// Check to see if this is a special global used by LLVM, if so, emit it.
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if (EmitSpecialLLVMGlobal(GVar))
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return;
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O << "\n\n";
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std::string name = Mang->getMangledName(GVar);
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Constant *C = GVar->getInitializer();
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const Type *CTy = C->getType();
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unsigned Size = TD->getTypeAllocSize(CTy);
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const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
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bool printSizeAndType = true;
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// A data structure or array is aligned in memory to the largest
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// alignment boundary required by any data type inside it (this matches
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// the Preferred Type Alignment). For integral types, the alignment is
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// the type size.
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unsigned Align;
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if (CTy->getTypeID() == Type::IntegerTyID ||
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CTy->getTypeID() == Type::VoidTyID) {
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assert(!(Size & (Size-1)) && "Alignment is not a power of two!");
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Align = Log2_32(Size);
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} else
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Align = TD->getPreferredTypeAlignmentShift(CTy);
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printVisibility(name, GVar->getVisibility());
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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
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TM));
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if (C->isNullValue() && !GVar->hasSection()) {
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if (!GVar->isThreadLocal() &&
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(GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
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if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
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if (GVar->hasLocalLinkage())
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O << "\t.local\t" << name << '\n';
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O << MAI->getCOMMDirective() << name << ',' << Size;
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if (MAI->getCOMMDirectiveTakesAlignment())
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O << ',' << (1 << Align);
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O << '\n';
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return;
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}
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}
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switch (GVar->getLinkage()) {
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case GlobalValue::LinkOnceAnyLinkage:
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case GlobalValue::LinkOnceODRLinkage:
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case GlobalValue::CommonLinkage:
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case GlobalValue::WeakAnyLinkage:
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case GlobalValue::WeakODRLinkage:
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// FIXME: Verify correct for weak.
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// Nonnull linkonce -> weak
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O << "\t.weak " << name << '\n';
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break;
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case GlobalValue::AppendingLinkage:
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// FIXME: appending linkage variables should go into a section of their name
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// or something. For now, just emit them as external.
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case GlobalValue::ExternalLinkage:
|
|
// If external or appending, declare as a global symbol
|
|
O << MAI->getGlobalDirective() << name << '\n';
|
|
// Fall Through
|
|
case GlobalValue::PrivateLinkage:
|
|
case GlobalValue::LinkerPrivateLinkage:
|
|
case GlobalValue::InternalLinkage:
|
|
if (CVA && CVA->isCString())
|
|
printSizeAndType = false;
|
|
break;
|
|
case GlobalValue::GhostLinkage:
|
|
llvm_unreachable("Should not have any unmaterialized functions!");
|
|
case GlobalValue::DLLImportLinkage:
|
|
llvm_unreachable("DLLImport linkage is not supported by this target!");
|
|
case GlobalValue::DLLExportLinkage:
|
|
llvm_unreachable("DLLExport linkage is not supported by this target!");
|
|
default:
|
|
llvm_unreachable("Unknown linkage type!");
|
|
}
|
|
|
|
EmitAlignment(Align, GVar);
|
|
|
|
if (MAI->hasDotTypeDotSizeDirective() && printSizeAndType) {
|
|
O << "\t.type " << name << ",@object\n";
|
|
O << "\t.size " << name << ',' << Size << '\n';
|
|
}
|
|
|
|
O << name << ":\n";
|
|
EmitGlobalConstant(C);
|
|
}
|
|
|
|
|
|
// Force static initialization.
|
|
extern "C" void LLVMInitializeMipsAsmPrinter() {
|
|
RegisterAsmPrinter<MipsAsmPrinter> X(TheMipsTarget);
|
|
RegisterAsmPrinter<MipsAsmPrinter> Y(TheMipselTarget);
|
|
}
|