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//===-- ARMSubtarget.cpp - ARM Subtarget Information ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Evan Cheng and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the ARM specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#include "ARMSubtarget.h"
#include "ARMGenSubtarget.inc"
#include "llvm/Module.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
// FIXME: this is temporary.
static cl::opt<bool> Thumb("enable-thumb",
cl::desc("Switch to thumb mode in ARM backend"));
ARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS)
: ARMArchVersion(V4T)
, HasVFP2(false)
, UseThumbBacktraces(false)
, IsR9Reserved(false)
, stackAlignment(8)
, TargetType(isELF) { // Default to ELF unless otherwise specified.
// Determine default and user specified characteristics
std::string CPU = "generic";
// Parse features string.
ParseSubtargetFeatures(FS, CPU);
IsThumb = Thumb;
// Set the boolean corresponding to the current target triple, or the default
// if one cannot be determined, to true.
const std::string& TT = M.getTargetTriple();
if (TT.length() > 5) {
if (TT.find("-darwin") != std::string::npos)
TargetType = isDarwin;
} else if (TT.empty()) {
#if defined(__APPLE__)
TargetType = isDarwin;
#endif
}
if (isTargetDarwin()) {
UseThumbBacktraces = true;
IsR9Reserved = true;
stackAlignment = 4;
}
}
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