lib/Target/ARM/ARMSubtarget.cpp

   1 //===-- ARMSubtarget.cpp - ARM Subtarget Information ------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by Evan Cheng and is distributed under the
   6 // University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the ARM specific subclass of TargetSubtarget.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ARMSubtarget.h"
  15 #include "ARMGenSubtarget.inc"
  16 #include "llvm/Module.h"
  17 using namespace llvm;
  18
  19 ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS, bool thumb)
  20   : ARMArchVersion(V4T)
  21   , HasVFP2(false)
  22   , IsThumb(thumb)
  23   , UseThumbBacktraces(false)
  24   , IsR9Reserved(false)
  25   , stackAlignment(4)
  26   , TargetType(isELF) // Default to ELF unless otherwise specified.
  27   , TargetABI(ARM_ABI_APCS) {
  28
  29   // Determine default and user specified characteristics
  30   std::string CPU = "generic";
  31
  32   // Parse features string.
  33   ParseSubtargetFeatures(FS, CPU);
  34
  35   // Set the boolean corresponding to the current target triple, or the default
  36   // if one cannot be determined, to true.
  37   const std::string& TT = M.getTargetTriple();
  38   if (TT.length() > 5) {
  39     if (TT.find("-darwin") != std::string::npos)
  40       TargetType = isDarwin;
  41   } else if (TT.empty()) {
  42 #if defined(__APPLE__)
  43     TargetType = isDarwin;
  44 #endif
  45   }
  46
  47   if (TT.find("eabi") != std::string::npos)
  48     TargetABI = ARM_ABI_AAPCS;
  49
  50   if (isAAPCS_ABI())
  51     stackAlignment = 8;
  52
  53   if (isTargetDarwin()) {
  54     UseThumbBacktraces = true;
  55     IsR9Reserved = true;
  56   }
  57 }