/3rd_party/llvm/lib/Target/MBlaze/MBlazeMCInstLower.cpp

https://code.google.com/p/softart/ · C++ · 167 lines · 127 code · 22 blank · 18 comment · 12 complexity · 799718b1136889007225cc09b88d5928 MD5 · raw file

  1. //===-- MBlazeMCInstLower.cpp - Convert MBlaze MachineInstr to an MCInst---===//
  2. //
  3. // The LLVM Compiler Infrastructure
  4. //
  5. // This file is distributed under the University of Illinois Open Source
  6. // License. See LICENSE.TXT for details.
  7. //
  8. //===----------------------------------------------------------------------===//
  9. //
  10. // This file contains code to lower MBlaze MachineInstrs to their corresponding
  11. // MCInst records.
  12. //
  13. //===----------------------------------------------------------------------===//
  14. #include "MBlazeMCInstLower.h"
  15. #include "MBlazeInstrInfo.h"
  16. #include "llvm/Constants.h"
  17. #include "llvm/CodeGen/AsmPrinter.h"
  18. #include "llvm/CodeGen/MachineBasicBlock.h"
  19. #include "llvm/CodeGen/MachineInstr.h"
  20. #include "llvm/MC/MCAsmInfo.h"
  21. #include "llvm/MC/MCContext.h"
  22. #include "llvm/MC/MCExpr.h"
  23. #include "llvm/MC/MCInst.h"
  24. #include "llvm/Target/Mangler.h"
  25. #include "llvm/Support/Debug.h"
  26. #include "llvm/Support/raw_ostream.h"
  27. #include "llvm/Support/ErrorHandling.h"
  28. #include "llvm/ADT/SmallString.h"
  29. using namespace llvm;
  30. MCSymbol *MBlazeMCInstLower::
  31. GetGlobalAddressSymbol(const MachineOperand &MO) const {
  32. switch (MO.getTargetFlags()) {
  33. default: llvm_unreachable("Unknown target flag on GV operand");
  34. case 0: break;
  35. }
  36. return Printer.Mang->getSymbol(MO.getGlobal());
  37. }
  38. MCSymbol *MBlazeMCInstLower::
  39. GetExternalSymbolSymbol(const MachineOperand &MO) const {
  40. switch (MO.getTargetFlags()) {
  41. default: llvm_unreachable("Unknown target flag on GV operand");
  42. case 0: break;
  43. }
  44. return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
  45. }
  46. MCSymbol *MBlazeMCInstLower::
  47. GetJumpTableSymbol(const MachineOperand &MO) const {
  48. SmallString<256> Name;
  49. raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
  50. << Printer.getFunctionNumber() << '_'
  51. << MO.getIndex();
  52. switch (MO.getTargetFlags()) {
  53. default: llvm_unreachable("Unknown target flag on GV operand");
  54. case 0: break;
  55. }
  56. // Create a symbol for the name.
  57. return Ctx.GetOrCreateSymbol(Name.str());
  58. }
  59. MCSymbol *MBlazeMCInstLower::
  60. GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
  61. SmallString<256> Name;
  62. raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
  63. << Printer.getFunctionNumber() << '_'
  64. << MO.getIndex();
  65. switch (MO.getTargetFlags()) {
  66. default:
  67. llvm_unreachable("Unknown target flag on GV operand");
  68. case 0: break;
  69. }
  70. // Create a symbol for the name.
  71. return Ctx.GetOrCreateSymbol(Name.str());
  72. }
  73. MCSymbol *MBlazeMCInstLower::
  74. GetBlockAddressSymbol(const MachineOperand &MO) const {
  75. switch (MO.getTargetFlags()) {
  76. default: llvm_unreachable("Unknown target flag on GV operand");
  77. case 0: break;
  78. }
  79. return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
  80. }
  81. MCOperand MBlazeMCInstLower::
  82. LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
  83. // FIXME: We would like an efficient form for this, so we don't have to do a
  84. // lot of extra uniquing.
  85. const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
  86. switch (MO.getTargetFlags()) {
  87. default:
  88. llvm_unreachable("Unknown target flag on GV operand");
  89. case 0: break;
  90. }
  91. if (!MO.isJTI() && MO.getOffset())
  92. Expr = MCBinaryExpr::CreateAdd(Expr,
  93. MCConstantExpr::Create(MO.getOffset(), Ctx),
  94. Ctx);
  95. return MCOperand::CreateExpr(Expr);
  96. }
  97. void MBlazeMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
  98. OutMI.setOpcode(MI->getOpcode());
  99. for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
  100. const MachineOperand &MO = MI->getOperand(i);
  101. MCOperand MCOp;
  102. switch (MO.getType()) {
  103. default: llvm_unreachable("unknown operand type");
  104. case MachineOperand::MO_Register:
  105. // Ignore all implicit register operands.
  106. if (MO.isImplicit()) continue;
  107. MCOp = MCOperand::CreateReg(MO.getReg());
  108. break;
  109. case MachineOperand::MO_Immediate:
  110. MCOp = MCOperand::CreateImm(MO.getImm());
  111. break;
  112. case MachineOperand::MO_MachineBasicBlock:
  113. MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
  114. MO.getMBB()->getSymbol(), Ctx));
  115. break;
  116. case MachineOperand::MO_GlobalAddress:
  117. MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
  118. break;
  119. case MachineOperand::MO_ExternalSymbol:
  120. MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
  121. break;
  122. case MachineOperand::MO_JumpTableIndex:
  123. MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
  124. break;
  125. case MachineOperand::MO_ConstantPoolIndex:
  126. MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
  127. break;
  128. case MachineOperand::MO_BlockAddress:
  129. MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
  130. break;
  131. case MachineOperand::MO_FPImmediate: {
  132. bool ignored;
  133. APFloat FVal = MO.getFPImm()->getValueAPF();
  134. FVal.convert(APFloat::IEEEsingle, APFloat::rmTowardZero, &ignored);
  135. APInt IVal = FVal.bitcastToAPInt();
  136. uint64_t Val = *IVal.getRawData();
  137. MCOp = MCOperand::CreateImm(Val);
  138. break;
  139. }
  140. case MachineOperand::MO_RegisterMask:
  141. continue;
  142. }
  143. OutMI.addOperand(MCOp);
  144. }
  145. }