It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 297 insertions, 0 deletions

diff --git a/lib/Target/Alpha/AlphaAsmPrinter.cpp b/lib/Target/Alpha/AlphaAsmPrinter.cpp
new file mode 100644
index 0000000..0494777
--- /dev/null
+++ b/lib/Target/Alpha/AlphaAsmPrinter.cpp
@@ -0,0 +1,297 @@
+//===-- AlphaAsmPrinter.cpp - Alpha LLVM assembly writer ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group 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 Alpha assembly language.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "asm-printer"
+#include "Alpha.h"
+#include "AlphaInstrInfo.h"
+#include "AlphaTargetMachine.h"
+#include "llvm/Module.h"
+#include "llvm/Type.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/Statistic.h"
+using namespace llvm;
+
+STATISTIC(EmittedInsts, "Number of machine instrs printed");
+
+namespace {
+  struct VISIBILITY_HIDDEN AlphaAsmPrinter : public AsmPrinter {
+
+    /// Unique incrementer for label values for referencing Global values.
+    ///
+
+    AlphaAsmPrinter(std::ostream &o, TargetMachine &tm, const TargetAsmInfo *T)
+      : AsmPrinter(o, tm, T) {
+    }
+
+    virtual const char *getPassName() const {
+      return "Alpha Assembly Printer";
+    }
+    bool printInstruction(const MachineInstr *MI);
+    void printOp(const MachineOperand &MO, bool IsCallOp = false);
+    void printOperand(const MachineInstr *MI, int opNum);
+    void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
+    bool runOnMachineFunction(MachineFunction &F);
+    bool doInitialization(Module &M);
+    bool doFinalization(Module &M);
+    
+    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                         unsigned AsmVariant, const char *ExtraCode);
+    bool PrintAsmMemoryOperand(const MachineInstr *MI, 
+                               unsigned OpNo,
+                               unsigned AsmVariant, 
+                               const char *ExtraCode);
+  };
+} // end of anonymous namespace
+
+/// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
+/// 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::createAlphaCodePrinterPass(std::ostream &o,
+                                               TargetMachine &tm) {
+  return new AlphaAsmPrinter(o, tm, tm.getTargetAsmInfo());
+}
+
+#include "AlphaGenAsmWriter.inc"
+
+void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
+{
+  const MachineOperand &MO = MI->getOperand(opNum);
+  if (MO.getType() == MachineOperand::MO_Register) {
+    assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
+    O << TM.getRegisterInfo()->get(MO.getReg()).Name;
+  } else if (MO.isImmediate()) {
+    O << MO.getImmedValue();
+    assert(MO.getImmedValue() < (1 << 30));
+  } else {
+    printOp(MO);
+  }
+}
+
+
+void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
+  const MRegisterInfo &RI = *TM.getRegisterInfo();
+
+  switch (MO.getType()) {
+  case MachineOperand::MO_Register:
+    O << RI.get(MO.getReg()).Name;
+    return;
+
+  case MachineOperand::MO_Immediate:
+    cerr << "printOp() does not handle immediate values\n";
+    abort();
+    return;
+
+  case MachineOperand::MO_MachineBasicBlock:
+    printBasicBlockLabel(MO.getMachineBasicBlock());
+    return;
+
+  case MachineOperand::MO_ConstantPoolIndex:
+    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
+      << MO.getConstantPoolIndex();
+    return;
+
+  case MachineOperand::MO_ExternalSymbol:
+    O << MO.getSymbolName();
+    return;
+
+  case MachineOperand::MO_GlobalAddress: {
+    GlobalValue *GV = MO.getGlobal();
+    O << Mang->getValueName(GV);
+    if (GV->isDeclaration() && GV->hasExternalWeakLinkage())
+      ExtWeakSymbols.insert(GV);
+    return;
+  }
+
+  case MachineOperand::MO_JumpTableIndex:
+    O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+      << '_' << MO.getJumpTableIndex();
+    return;
+
+  default:
+    O << "<unknown operand type: " << MO.getType() << ">";
+    return;
+  }
+}
+
+/// runOnMachineFunction - This uses the printMachineInstruction()
+/// method to print assembly for each instruction.
+///
+bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
+  SetupMachineFunction(MF);
+  O << "\n\n";
+
+  // Print out constants referenced by the function
+  EmitConstantPool(MF.getConstantPool());
+
+  // Print out jump tables referenced by the function
+  EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
+
+  // Print out labels for the function.
+  const Function *F = MF.getFunction();
+  SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
+  
+  EmitAlignment(4, F);
+  switch (F->getLinkage()) {
+  default: assert(0 && "Unknown linkage type!");
+  case Function::InternalLinkage:  // Symbols default to internal.
+    break;
+   case Function::ExternalLinkage:
+     O << "\t.globl " << CurrentFnName << "\n";
+     break;
+  case Function::WeakLinkage:
+  case Function::LinkOnceLinkage:
+    O << TAI->getWeakRefDirective() << CurrentFnName << "\n";
+    break;
+  }
+
+  O << "\t.ent " << CurrentFnName << "\n";
+
+  O << CurrentFnName << ":\n";
+
+  // Print out code for the function.
+  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+       I != E; ++I) {
+    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.
+      ++EmittedInsts;
+      O << "\t";
+      if (!printInstruction(II)) {
+        assert(0 && "Unhandled instruction in asm writer!");
+        abort();
+      }
+    }
+  }
+
+  O << "\t.end " << CurrentFnName << "\n";
+
+  // We didn't modify anything.
+  return false;
+}
+
+bool AlphaAsmPrinter::doInitialization(Module &M)
+{
+  if(TM.getSubtarget<AlphaSubtarget>().hasCT())
+    O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
+  else
+    O << "\t.arch ev6\n";
+  O << "\t.set noat\n";
+  AsmPrinter::doInitialization(M);
+  return false;
+}
+
+bool AlphaAsmPrinter::doFinalization(Module &M) {
+  const TargetData *TD = TM.getTargetData();
+
+  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) {
+
+    if (!I->hasInitializer()) continue;  // External global require no code
+    
+    // Check to see if this is a special global used by LLVM, if so, emit it.
+    if (EmitSpecialLLVMGlobal(I))
+      continue;
+    
+    std::string name = Mang->getValueName(I);
+    Constant *C = I->getInitializer();
+    unsigned Size = TD->getTypeSize(C->getType());
+    unsigned Align = TD->getPreferredAlignmentLog(I);
+    
+    //1: hidden?
+    if (I->hasHiddenVisibility())
+      O << TAI->getHiddenDirective() << name << "\n";
+    
+    //2: kind
+    switch (I->getLinkage()) {
+    case GlobalValue::LinkOnceLinkage:
+    case GlobalValue::WeakLinkage:
+      O << TAI->getWeakRefDirective() << name << '\n';
+      break;
+    case GlobalValue::AppendingLinkage:
+    case GlobalValue::ExternalLinkage:
+      O << "\t.globl " << name << "\n";
+      break;
+    case GlobalValue::InternalLinkage:
+      break;
+    default:
+      assert(0 && "Unknown linkage type!");
+      cerr << "Unknown linkage type!\n";
+      abort();
+    }
+    
+    //3: Section (if changed)
+    if (I->hasSection() &&
+        (I->getSection() == ".ctors" ||
+         I->getSection() == ".dtors")) {
+      std::string SectionName = ".section\t" + I->getSection()
+        + ",\"aw\",@progbits";
+      SwitchToDataSection(SectionName.c_str());
+    } else {
+      if (C->isNullValue())
+        SwitchToDataSection("\t.section\t.bss", I);
+      else
+        SwitchToDataSection("\t.section\t.data", I);
+    }
+    
+    //4: Type, Size, Align
+    O << "\t.type\t" << name << ", @object\n";
+    O << "\t.size\t" << name << ", " << Size << "\n";
+    EmitAlignment(Align, I);
+    
+    O << name << ":\n";
+    
+    // If the initializer is a extern weak symbol, remember to emit the weak
+    // reference!
+    if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
+      if (GV->hasExternalWeakLinkage())
+        ExtWeakSymbols.insert(GV);
+    
+    EmitGlobalConstant(C);
+    O << '\n';
+  }
+
+  AsmPrinter::doFinalization(M);
+  return false;
+}
+
+/// PrintAsmOperand - Print out an operand for an inline asm expression.
+///
+bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                                      unsigned AsmVariant, 
+                                      const char *ExtraCode) {
+  printOperand(MI, OpNo);
+  return false;
+}
+
+bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, 
+                                            unsigned OpNo,
+                                            unsigned AsmVariant, 
+                                            const char *ExtraCode) {
+  if (ExtraCode && ExtraCode[0])
+    return true; // Unknown modifier.
+  O << "0(";
+  printOperand(MI, OpNo);
+  O << ")";
+  return false;
+}