//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#include "Mips.h"
#include "MipsInstrInfo.h"
#include "MipsTargetMachine.h"
+#include "MipsMachineFunction.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/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Debug.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MathExtras.h"
#include <cctype>
return "Mips Assembly Printer";
}
+ enum SetDirectiveFlags {
+ REORDER, // enables instruction reordering.
+ NOREORDER, // disables instruction reordering.
+ MACRO, // enables GAS macros.
+ NOMACRO // disables GAS macros.
+ };
+
void printOperand(const MachineInstr *MI, int opNum);
void printMemOperand(const MachineInstr *MI, int opNum,
const char *Modifier = 0);
+ void printFCCOperand(const MachineInstr *MI, int opNum,
+ const char *Modifier = 0);
+
+ unsigned int getSavedRegsBitmask(bool isFloat, MachineFunction &MF);
+ void printHex32(unsigned int Value);
+
+ void emitFunctionStart(MachineFunction &MF);
+ void emitFunctionEnd(MachineFunction &MF);
+ void emitFrameDirective(MachineFunction &MF);
+ void emitMaskDirective(MachineFunction &MF);
+ void emitFMaskDirective(MachineFunction &MF);
+ void emitSetDirective(SetDirectiveFlags Flag);
bool printInstruction(const MachineInstr *MI); // autogenerated.
bool runOnMachineFunction(MachineFunction &F);
return new MipsAsmPrinter(o, tm, tm.getTargetAsmInfo());
}
+//===----------------------------------------------------------------------===//
+//
+// Mips Asm Directives
+//
+// -- Frame directive "frame Stackpointer, Stacksize, RARegister"
+// Describe the stack frame.
+//
+// -- Mask directives "(f)mask bitmask, offset"
+// Tells the assembler which registers are saved and where.
+// bitmask - contain a little endian bitset indicating which registers are
+// saved on function prologue (e.g. with a 0x80000000 mask, the
+// assembler knows the register 31 (RA) is saved at prologue.
+// offset - the position before stack pointer subtraction indicating where
+// the first saved register on prologue is located. (e.g. with a
+//
+// Consider the following function prologue:
+//
+// .frame $fp,48,$ra
+// .mask 0xc0000000,-8
+// addiu $sp, $sp, -48
+// sw $ra, 40($sp)
+// sw $fp, 36($sp)
+//
+// With a 0xc0000000 mask, the assembler knows the register 31 (RA) and
+// 30 (FP) are saved at prologue. As the save order on prologue is from
+// left to right, RA is saved first. A -8 offset means that after the
+// stack pointer subtration, the first register in the mask (RA) will be
+// saved at address 48-8=40.
+//
+//===----------------------------------------------------------------------===//
+
+/// Mask directive for GPR
+void MipsAsmPrinter::
+emitMaskDirective(MachineFunction &MF)
+{
+ MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
+
+ int StackSize = MF.getFrameInfo()->getStackSize();
+ int Offset = (!MipsFI->getTopSavedRegOffset()) ? 0 :
+ (-(StackSize-MipsFI->getTopSavedRegOffset()));
+
+ #ifndef NDEBUG
+ DOUT << "--> emitMaskDirective" << "\n";
+ DOUT << "StackSize : " << StackSize << "\n";
+ DOUT << "getTopSavedReg : " << MipsFI->getTopSavedRegOffset() << "\n";
+ DOUT << "Offset : " << Offset << "\n\n";
+ #endif
+
+ unsigned int Bitmask = getSavedRegsBitmask(false, MF);
+ O << "\t.mask \t";
+ printHex32(Bitmask);
+ O << "," << Offset << "\n";
+}
+
+/// TODO: Mask Directive for Float Point
+void MipsAsmPrinter::
+emitFMaskDirective(MachineFunction &MF)
+{
+ unsigned int Bitmask = getSavedRegsBitmask(true, MF);
+
+ O << "\t.fmask\t";
+ printHex32(Bitmask);
+ O << ",0" << "\n";
+}
+
+/// Frame Directive
+void MipsAsmPrinter::
+emitFrameDirective(MachineFunction &MF)
+{
+ const TargetRegisterInfo &RI = *TM.getRegisterInfo();
+
+ unsigned stackReg = RI.getFrameRegister(MF);
+ unsigned returnReg = RI.getRARegister();
+ unsigned stackSize = MF.getFrameInfo()->getStackSize();
+
+
+ O << "\t.frame\t" << "$" << LowercaseString(RI.get(stackReg).AsmName)
+ << "," << stackSize << ","
+ << "$" << LowercaseString(RI.get(returnReg).AsmName)
+ << "\n";
+}
+
+/// Emit Set directives.
+void MipsAsmPrinter::
+emitSetDirective(SetDirectiveFlags Flag)
+{
+ O << "\t.set\t";
+ switch(Flag) {
+ case REORDER: O << "reorder" << "\n"; break;
+ case NOREORDER: O << "noreorder" << "\n"; break;
+ case MACRO: O << "macro" << "\n"; break;
+ case NOMACRO: O << "nomacro" << "\n"; break;
+ default: break;
+ }
+}
+
+// Create a bitmask with all callee saved registers for CPU
+// or Float Point registers. For CPU registers consider RA,
+// GP and FP for saving if necessary.
+unsigned int MipsAsmPrinter::
+getSavedRegsBitmask(bool isFloat, MachineFunction &MF)
+{
+ const TargetRegisterInfo &RI = *TM.getRegisterInfo();
+
+ // Float Point Registers, TODO
+ if (isFloat)
+ return 0;
+
+ // CPU Registers
+ unsigned int Bitmask = 0;
+
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+ for (unsigned i = 0, e = CSI.size(); i != e; ++i)
+ Bitmask |= (1 << MipsRegisterInfo::getRegisterNumbering(CSI[i].getReg()));
+
+ if (RI.hasFP(MF))
+ Bitmask |= (1 << MipsRegisterInfo::
+ getRegisterNumbering(RI.getFrameRegister(MF)));
+
+ if (MF.getFrameInfo()->hasCalls())
+ Bitmask |= (1 << MipsRegisterInfo::
+ getRegisterNumbering(RI.getRARegister()));
+
+ return Bitmask;
+}
+
+// Print a 32 bit hex number with all numbers.
+void MipsAsmPrinter::
+printHex32(unsigned int Value)
+{
+ O << "0x" << std::hex;
+ for (int i = 7; i >= 0; i--)
+ O << std::hex << ( (Value & (0xF << (i*4))) >> (i*4) );
+ O << std::dec;
+}
+
+/// Emit the directives used by GAS on the start of functions
+void MipsAsmPrinter::
+emitFunctionStart(MachineFunction &MF)
+{
+ // Print out the label for the function.
+ const Function *F = MF.getFunction();
+ SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
+
+ // 2 bits aligned
+ EmitAlignment(2, F);
+
+ O << "\t.globl\t" << CurrentFnName << "\n";
+ O << "\t.ent\t" << CurrentFnName << "\n";
+ O << "\t.type\t" << CurrentFnName << ", @function\n";
+ O << CurrentFnName << ":\n";
+
+ emitFrameDirective(MF);
+ emitMaskDirective(MF);
+ emitFMaskDirective(MF);
+
+ if (TM.getRelocationModel() == Reloc::Static) {
+ emitSetDirective(NOREORDER);
+ emitSetDirective(NOMACRO);
+ }
+
+ O << "\n";
+}
+
+/// Emit the directives used by GAS on the end of functions
+void MipsAsmPrinter::
+emitFunctionEnd(MachineFunction &MF)
+{
+ if (TM.getRelocationModel() == Reloc::Static) {
+ emitSetDirective(MACRO);
+ emitSetDirective(REORDER);
+ }
+
+ O << "\t.end\t" << CurrentFnName << "\n";
+}
+
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
bool MipsAsmPrinter::
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
+ // Print out jump tables referenced by the function
+ EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
+
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";
+ // Emit the function start directives
+ emitFunctionStart(MF);
// Print out code for the function.
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
// Print a label for the basic block.
if (I != MF.begin()) {
- printBasicBlockLabel(I, true);
+ printBasicBlockLabel(I, true, 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;
}
+
+ // Each Basic Block is separated by a newline
+ O << '\n';
}
- // close function with asm directive
- O << "\t.end\t" << CurrentFnName << "\n";
+ // Emit function end directives
+ emitFunctionEnd(MF);
// We didn't modify anything.
return false;
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
+ const TargetRegisterInfo &RI = *TM.getRegisterInfo();
+ bool closeP = false;
+ bool isPIC = (TM.getRelocationModel() == Reloc::PIC_);
+ bool isCodeLarge = (TM.getCodeModel() == CodeModel::Large);
+
+ // %hi and %lo used on mips gas to load global addresses on
+ // static code. %got is used to load global addresses when
+ // using PIC_. %call16 is used to load direct call targets
+ // on PIC_ and small code size. %call_lo and %call_hi load
+ // direct call targets on PIC_ and large code size.
if (MI->getOpcode() == Mips::LUi && !MO.isRegister()
&& !MO.isImmediate()) {
- O << "%hi(";
+ if ((isPIC) && (isCodeLarge))
+ O << "%call_hi(";
+ else
+ O << "%hi(";
closeP = true;
} else if ((MI->getOpcode() == Mips::ADDiu) && !MO.isRegister()
&& !MO.isImmediate()) {
O << "%lo(";
closeP = true;
+ } else if ((isPIC) && (MI->getOpcode() == Mips::LW)
+ && (!MO.isRegister()) && (!MO.isImmediate())) {
+ const MachineOperand &firstMO = MI->getOperand(opNum-1);
+ const MachineOperand &lastMO = MI->getOperand(opNum+1);
+ if ((firstMO.isRegister()) && (lastMO.isRegister())) {
+ if ((firstMO.getReg() == Mips::T9) && (lastMO.getReg() == Mips::GP)
+ && (!isCodeLarge))
+ O << "%call16(";
+ else if ((firstMO.getReg() != Mips::T9) && (lastMO.getReg() == Mips::GP))
+ O << "%got(";
+ else if ((firstMO.getReg() == Mips::T9) && (lastMO.getReg() != Mips::GP)
+ && (isCodeLarge))
+ O << "%call_lo(";
+ closeP = true;
+ }
}
switch (MO.getType())
{
case MachineOperand::MO_Register:
- if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
- O << "$" << LowercaseString (RI.get(MO.getReg()).Name);
+ if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
+ O << "$" << LowercaseString (RI.get(MO.getReg()).AsmName);
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();
+ (MI->getOpcode() == Mips::LUi) || (MI->getOpcode() == Mips::ANDi))
+ O << (unsigned short int)MO.getImm();
else
- O << (int)MO.getImmedValue();
+ O << (short int)MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
- printBasicBlockLabel(MO.getMachineBasicBlock());
+ printBasicBlockLabel(MO.getMBB());
return;
case MachineOperand::MO_GlobalAddress:
O << MO.getSymbolName();
break;
+ case MachineOperand::MO_JumpTableIndex:
+ O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+ << '_' << MO.getIndex();
+ break;
+
+ // FIXME: Verify correct
case MachineOperand::MO_ConstantPoolIndex:
O << TAI->getPrivateGlobalPrefix() << "CPI"
- << getFunctionNumber() << "_" << MO.getConstantPoolIndex();
+ << getFunctionNumber() << "_" << MO.getIndex();
break;
default:
void MipsAsmPrinter::
printMemOperand(const MachineInstr *MI, int opNum, const char *Modifier)
{
- // lw/sw $reg, MemOperand
- // will turn into :
- // lw/sw $reg, imm($reg)
+ // when using stack locations for not load/store instructions
+ // print the same way as all normal 3 operand instructions.
+ if (Modifier && !strcmp(Modifier, "stackloc")) {
+ printOperand(MI, opNum+1);
+ O << ", ";
+ printOperand(MI, opNum);
+ return;
+ }
+
+ // Load/Store memory operands -- imm($reg)
+ // If PIC target the target is loaded as the
+ // pattern lw $25,%call16($28)
printOperand(MI, opNum);
O << "(";
printOperand(MI, opNum+1);
O << ")";
}
+void MipsAsmPrinter::
+printFCCOperand(const MachineInstr *MI, int opNum, const char *Modifier)
+{
+ const MachineOperand& MO = MI->getOperand(opNum);
+ O << Mips::MipsFCCToString((Mips::CondCode)MO.getImm());
+}
+
bool MipsAsmPrinter::
doInitialization(Module &M)
{
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());
+ unsigned Size = TD->getABITypeSize(C->getType());
+ unsigned Align = TD->getPreferredAlignmentLog(I);
+ // Is this correct ?
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";
+ I->hasInternalLinkage() || I->hasWeakLinkage() ||
+ I->hasCommonLinkage()))
+ {
+ if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
+
+ if (!NoZerosInBSS && TAI->getBSSSection())
+ SwitchToDataSection(TAI->getBSSSection(), I);
+ else
+ SwitchToDataSection(TAI->getDataSection(), I);
+
+ if (I->hasInternalLinkage()) {
+ if (TAI->getLCOMMDirective())
+ O << TAI->getLCOMMDirective() << name << "," << Size;
+ else
+ O << "\t.local\t" << name << "\n";
+ } else {
+ O << TAI->getCOMMDirective() << name << "," << Size;
+ // The .comm alignment in bytes.
+ if (TAI->getCOMMDirectiveTakesAlignment())
+ O << "," << (1 << Align);
+ }
} else {
switch (I->getLinkage())
{
case GlobalValue::LinkOnceLinkage:
- case GlobalValue::WeakLinkage:
+ case GlobalValue::CommonLinkage:
+ case GlobalValue::WeakLinkage:
// FIXME: Verify correct for weak.
// Nonnull linkonce -> weak
O << "\t.weak " << name << "\n";
// 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";
+ O << TAI->getGlobalDirective() << name << "\n";
+ // Fall Through
case GlobalValue::InternalLinkage:
- if (C->isNullValue())
- SwitchToDataSection(".bss", I);
- else
- SwitchToDataSection(".data", I);
+ // FIXME: special handling for ".ctors" & ".dtors" sections
+ if (I->hasSection() && (I->getSection() == ".ctors" ||
+ I->getSection() == ".dtors")) {
+ std::string SectionName = ".section " + I->getSection();
+ SectionName += ",\"aw\",%progbits";
+ SwitchToDataSection(SectionName.c_str());
+ } else {
+ if (C->isNullValue() && !NoZerosInBSS && TAI->getBSSSection())
+ SwitchToDataSection(TAI->getBSSSection(), I);
+ else if (!I->isConstant())
+ SwitchToDataSection(TAI->getDataSection(), I);
+ else {
+ // Read-only data.
+ if (TAI->getReadOnlySection())
+ SwitchToDataSection(TAI->getReadOnlySection(), I);
+ else
+ SwitchToDataSection(TAI->getDataSection(), I);
+ }
+ }
break;
case GlobalValue::GhostLinkage:
- cerr << "Should not have any"
- << "unmaterialized functions!\n";
+ cerr << "Should not have any unmaterialized functions!\n";
abort();
case GlobalValue::DLLImportLinkage:
- cerr << "DLLImport linkage is"
- << "not supported by this target!\n";
+ cerr << "DLLImport linkage is not supported by this target!\n";
abort();
case GlobalValue::DLLExportLinkage:
- cerr << "DLLExport linkage is"
- << "not supported by this target!\n";
+ 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";
}
}
- AsmPrinter::doFinalization(M);
- return false; // success
+ O << "\n";
+
+ return AsmPrinter::doFinalization(M);
}
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