Initial Mips support, here we go! =)
- Modifications from the last patch included
(issues pointed by Evan Cheng are now fixed).
- Added more MipsI instructions.
- Added more patterns to match branch instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37461 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsAsmPrinter.cpp b/lib/Target/Mips/MipsAsmPrinter.cpp
new file mode 100644
index 0000000..fdf60d9
--- /dev/null
+++ b/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -0,0 +1,294 @@
+//===-- MipsAsmPrinter.cpp - Mips LLVM assembly writer --------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Bruno Cardoso Lopes and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to GAS-format MIPS assembly language.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "mips-asm-printer"
+
+#include "Mips.h"
+#include "MipsInstrInfo.h"
+#include "MipsTargetMachine.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/MathExtras.h"
+#include <cctype>
+
+using namespace llvm;
+
+STATISTIC(EmittedInsts, "Number of machine instrs printed");
+
+namespace {
+ struct VISIBILITY_HIDDEN MipsAsmPrinter : public AsmPrinter {
+ MipsAsmPrinter(std::ostream &O, MipsTargetMachine &TM,
+ const TargetAsmInfo *T):
+ AsmPrinter(O, TM, T) {}
+
+ virtual const char *getPassName() const {
+ return "Mips Assembly Printer";
+ }
+
+ void printOperand(const MachineInstr *MI, int opNum);
+ void printMemOperand(const MachineInstr *MI, int opNum,
+ const char *Modifier = 0);
+
+ bool printInstruction(const MachineInstr *MI); // autogenerated.
+ bool runOnMachineFunction(MachineFunction &F);
+ bool doInitialization(Module &M);
+ bool doFinalization(Module &M);
+ };
+} // end of anonymous namespace
+
+#include "MipsGenAsmWriter.inc"
+
+/// createMipsCodePrinterPass - Returns a pass that prints the MIPS
+/// assembly code for a MachineFunction to the given output stream,
+/// using the given target machine description. This should work
+/// regardless of whether the function is in SSA form.
+FunctionPass *llvm::createMipsCodePrinterPass(std::ostream &o,
+ MipsTargetMachine &tm)
+{
+ return new MipsAsmPrinter(o, tm, tm.getTargetAsmInfo());
+}
+
+/// runOnMachineFunction - This uses the printMachineInstruction()
+/// method to print assembly for each instruction.
+bool MipsAsmPrinter::
+runOnMachineFunction(MachineFunction &MF)
+{
+ SetupMachineFunction(MF);
+
+ // Print out constants referenced by the function
+ EmitConstantPool(MF.getConstantPool());
+
+ O << "\n\n";
+
+ // What's my mangled name?
+ CurrentFnName = Mang->getValueName(MF.getFunction());
+
+ // Print out the label for the function.
+ const Function *F = MF.getFunction();
+ SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
+
+ // On Mips GAS if .align #n is present, #n means the number of bits
+ // to be cleared to align. So, if we want 4 byte alignment, we must
+ // have .align 2
+ // TODO:
+ // add gas ".mask" and ".fmask"
+ EmitAlignment(1, F);
+ O << "\t.globl\t" << CurrentFnName << "\n";
+ O << "\t.ent\t" << CurrentFnName << "\n";
+ O << "\t.type\t" << CurrentFnName << ", @function\n";
+ O << CurrentFnName << ":\n";
+
+ // Print out code for the function.
+ for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+ I != E; ++I) {
+
+ // Print a label for the basic block.
+ if (I != MF.begin()) {
+ printBasicBlockLabel(I, true);
+ O << '\n';
+ }
+
+ for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
+ II != E; ++II) {
+ // Print the assembly for the instruction.
+ O << "\t";
+ printInstruction(II);
+ ++EmittedInsts;
+ }
+ }
+
+ // close function with asm directive
+ O << "\t.end\t" << CurrentFnName << "\n";
+
+ // We didn't modify anything.
+ return false;
+}
+
+void MipsAsmPrinter::
+printOperand(const MachineInstr *MI, int opNum)
+{
+ const MachineOperand &MO = MI->getOperand(opNum);
+ const MRegisterInfo &RI = *TM.getRegisterInfo();
+ bool closeP=false;
+
+ // %hi and %lo used on mips gas to break large constants
+ if (MI->getOpcode() == Mips::LUi && !MO.isRegister()
+ && !MO.isImmediate()) {
+ O << "%hi(";
+ closeP = true;
+ } else if ((MI->getOpcode() == Mips::ADDiu) && !MO.isRegister()
+ && !MO.isImmediate()) {
+ O << "%lo(";
+ closeP = true;
+ }
+
+ switch (MO.getType())
+ {
+ case MachineOperand::MO_Register:
+ if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
+ O << "$" << LowercaseString (RI.get(MO.getReg()).Name);
+ else
+ O << "$" << MO.getReg();
+ break;
+
+ case MachineOperand::MO_Immediate:
+ if ((MI->getOpcode() == Mips::SLTiu) || (MI->getOpcode() == Mips::ORi) ||
+ (MI->getOpcode() == Mips::LUi) || (MI->getOpcode() == Mips::ANDi))
+ O << (unsigned int)MO.getImmedValue();
+ else
+ O << (int)MO.getImmedValue();
+ break;
+
+ case MachineOperand::MO_MachineBasicBlock:
+ printBasicBlockLabel(MO.getMachineBasicBlock());
+ return;
+
+ case MachineOperand::MO_GlobalAddress:
+ O << Mang->getValueName(MO.getGlobal());
+ break;
+
+ case MachineOperand::MO_ExternalSymbol:
+ O << MO.getSymbolName();
+ break;
+
+ case MachineOperand::MO_ConstantPoolIndex:
+ O << TAI->getPrivateGlobalPrefix() << "CPI"
+ << getFunctionNumber() << "_" << MO.getConstantPoolIndex();
+ break;
+
+ default:
+ O << "<unknown operand type>"; abort (); break;
+ }
+
+ if (closeP) O << ")";
+}
+
+void MipsAsmPrinter::
+printMemOperand(const MachineInstr *MI, int opNum, const char *Modifier)
+{
+ // lw/sw $reg, MemOperand
+ // will turn into :
+ // lw/sw $reg, imm($reg)
+ printOperand(MI, opNum);
+ O << "(";
+ printOperand(MI, opNum+1);
+ O << ")";
+}
+
+bool MipsAsmPrinter::
+doInitialization(Module &M)
+{
+ Mang = new Mangler(M);
+ return false; // success
+}
+
+bool MipsAsmPrinter::
+doFinalization(Module &M)
+{
+ const TargetData *TD = TM.getTargetData();
+
+ // Print out module-level global variables here.
+ for (Module::const_global_iterator I = M.global_begin(),
+ E = M.global_end(); I != E; ++I)
+
+ // External global require no code
+ if (I->hasInitializer()) {
+
+ // Check to see if this is a special global
+ // used by LLVM, if so, emit it.
+ if (EmitSpecialLLVMGlobal(I))
+ continue;
+
+ O << "\n\n";
+ std::string name = Mang->getValueName(I);
+ Constant *C = I->getInitializer();
+ unsigned Size = TD->getTypeSize(C->getType());
+ unsigned Align = TD->getPrefTypeAlignment(C->getType());
+
+ if (C->isNullValue() && (I->hasLinkOnceLinkage() ||
+ I->hasInternalLinkage() || I->hasWeakLinkage()
+ /* FIXME: Verify correct */)) {
+
+ SwitchToDataSection(".data", I);
+ if (I->hasInternalLinkage())
+ O << "\t.local " << name << "\n";
+
+ O << "\t.comm " << name << ","
+ << TD->getTypeSize(C->getType())
+ << "," << Align << "\n";
+
+ } else {
+
+ switch (I->getLinkage())
+ {
+ case GlobalValue::LinkOnceLinkage:
+ case GlobalValue::WeakLinkage:
+ // FIXME: Verify correct for weak.
+ // Nonnull linkonce -> weak
+ O << "\t.weak " << name << "\n";
+ SwitchToDataSection("", I);
+ O << "\t.section\t\".llvm.linkonce.d." << name
+ << "\",\"aw\",@progbits\n";
+ break;
+ case GlobalValue::AppendingLinkage:
+ // FIXME: appending linkage variables
+ // should go into a section of their name or
+ // something. For now, just emit them as external.
+ case GlobalValue::ExternalLinkage:
+ // If external or appending, declare as a global symbol
+ O << "\t.globl " << name << "\n";
+ case GlobalValue::InternalLinkage:
+ if (C->isNullValue())
+ SwitchToDataSection(".bss", I);
+ else
+ SwitchToDataSection(".data", I);
+ break;
+ case GlobalValue::GhostLinkage:
+ cerr << "Should not have any"
+ << "unmaterialized functions!\n";
+ abort();
+ case GlobalValue::DLLImportLinkage:
+ cerr << "DLLImport linkage is"
+ << "not supported by this target!\n";
+ abort();
+ case GlobalValue::DLLExportLinkage:
+ cerr << "DLLExport linkage is"
+ << "not supported by this target!\n";
+ abort();
+ default:
+ assert(0 && "Unknown linkage type!");
+ }
+ O << "\t.align " << Align << "\n";
+ O << "\t.type " << name << ",@object\n";
+ O << "\t.size " << name << "," << Size << "\n";
+ O << name << ":\n";
+ EmitGlobalConstant(C);
+ }
+ }
+
+ AsmPrinter::doFinalization(M);
+ return false; // success
+}