1 //===-- ARMSubtarget.cpp - ARM Subtarget Information ------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the ARM specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #include "ARMSubtarget.h"
15 #include "ARMGenSubtarget.inc"
16 #include "llvm/Module.h"
19 ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS,
23 , ThumbMode((isThumb ? Thumb1 : ThumbNone))
24 , UseThumbBacktraces(false)
27 , CPUString("generic")
28 , TargetType(isELF) // Default to ELF unless otherwise specified.
29 , TargetABI(ARM_ABI_APCS) {
30 // Determine default and user specified characteristics
32 // Parse features string.
33 CPUString = ParseSubtargetFeatures(FS, CPUString);
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 unsigned Len = TT.length();
41 if (Len >= 5 && TT.substr(0, 4) == "armv")
43 else if (Len >= 6 && TT.substr(0, 6) == "thumb") {
45 if (Len >= 7 && TT[5] == 'v')
49 unsigned SubVer = TT[Idx];
50 if (SubVer > '4' && SubVer <= '9') {
55 } else if (SubVer == '6') {
57 if (isThumb && Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == '2')
59 } else if (SubVer == '5') {
61 if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e')
62 ARMArchVersion = V5TE;
68 if (TT.find("-darwin") != std::string::npos)
70 TargetType = isDarwin;
71 } else if (TT.empty()) {
72 #if defined(__APPLE__)
73 TargetType = isDarwin;
77 if (TT.find("eabi") != std::string::npos)
78 TargetABI = ARM_ABI_AAPCS;
83 if (isTargetDarwin()) {
84 UseThumbBacktraces = true;