Evan Cheng | a8e2989 | 2007-01-19 07:51:42 +0000 | [diff] [blame] | 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 | #include "llvm/Support/CommandLine.h" |
| 18 | using namespace llvm; |
| 19 | |
| 20 | // FIXME: this is temporary. |
| 21 | static cl::opt<bool> Thumb("enable-thumb", |
| 22 | cl::desc("Switch to thumb mode in ARM backend")); |
| 23 | |
| 24 | ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS) |
| 25 | : ARMArchVersion(V4T), HasVFP2(false), IsDarwin(false), |
| 26 | UseThumbBacktraces(false), IsR9Reserved(false), stackAlignment(8) { |
| 27 | |
| 28 | // Determine default and user specified characteristics |
| 29 | std::string CPU = "generic"; |
| 30 | |
| 31 | // Parse features string. |
| 32 | ParseSubtargetFeatures(FS, CPU); |
| 33 | |
| 34 | IsThumb = Thumb; |
| 35 | |
| 36 | // Set the boolean corresponding to the current target triple, or the default |
| 37 | // if one cannot be determined, to true. |
| 38 | const std::string& TT = M.getTargetTriple(); |
| 39 | if (TT.length() > 5) { |
| 40 | IsDarwin = TT.find("-darwin") != std::string::npos; |
| 41 | } else if (TT.empty()) { |
| 42 | #if defined(__APPLE__) |
| 43 | IsDarwin = true; |
| 44 | #endif |
| 45 | } |
| 46 | |
| 47 | if (IsDarwin) { |
| 48 | UseThumbBacktraces = true; |
| 49 | IsR9Reserved = true; |
| 50 | stackAlignment = 4; |
| 51 | } |
| 52 | } |