bool testBuildAttr(unsigned Tag, unsigned Value,
unsigned ExpectedTag, unsigned ExpectedValue) {
std::string buffer;
raw_string_ostream OS(buffer);
AttributeSection Section(Tag, Value);
Section.write(OS);
ArrayRef<uint8_t> Bytes(
reinterpret_cast<const uint8_t*>(OS.str().c_str()), OS.str().size());
ARMAttributeParser Parser;
Parser.Parse(Bytes, true);
return (Parser.hasAttribute(ExpectedTag) &&
Parser.getAttributeValue(ExpectedTag) == ExpectedValue);
}
// FIXME Encode from a tablegen description or target parser.
void ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const {
if (TheTriple.getSubArch() != Triple::NoSubArch)
return;
ARMAttributeParser Attributes;
std::error_code EC = getBuildAttributes(Attributes);
if (EC)
return;
std::string Triple;
// Default to ARM, but use the triple if it's been set.
if (TheTriple.getArch() == Triple::thumb ||
TheTriple.getArch() == Triple::thumbeb)
Triple = "thumb";
else
Triple = "arm";
if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch)) {
switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)) {
case ARMBuildAttrs::v4:
Triple += "v4";
break;
case ARMBuildAttrs::v4T:
Triple += "v4t";
break;
case ARMBuildAttrs::v5T:
Triple += "v5t";
break;
case ARMBuildAttrs::v5TE:
Triple += "v5te";
break;
case ARMBuildAttrs::v5TEJ:
Triple += "v5tej";
break;
case ARMBuildAttrs::v6:
Triple += "v6";
break;
case ARMBuildAttrs::v6KZ:
Triple += "v6kz";
break;
case ARMBuildAttrs::v6T2:
Triple += "v6t2";
break;
case ARMBuildAttrs::v6K:
Triple += "v6k";
break;
case ARMBuildAttrs::v7:
Triple += "v7";
break;
case ARMBuildAttrs::v6_M:
Triple += "v6m";
break;
case ARMBuildAttrs::v6S_M:
Triple += "v6sm";
break;
case ARMBuildAttrs::v7E_M:
Triple += "v7em";
break;
}
}
if (!isLittleEndian())
Triple += "eb";
TheTriple.setArchName(Triple);
}
SubtargetFeatures ELFObjectFileBase::getARMFeatures() const {
SubtargetFeatures Features;
ARMAttributeParser Attributes;
std::error_code EC = getBuildAttributes(Attributes);
if (EC)
return SubtargetFeatures();
// both ARMv7-M and R have to support thumb hardware div
bool isV7 = false;
if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch))
isV7 = Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)
== ARMBuildAttrs::v7;
if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch_profile)) {
switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch_profile)) {
case ARMBuildAttrs::ApplicationProfile:
Features.AddFeature("aclass");
break;
case ARMBuildAttrs::RealTimeProfile:
Features.AddFeature("rclass");
if (isV7)
Features.AddFeature("hwdiv");
break;
case ARMBuildAttrs::MicroControllerProfile:
Features.AddFeature("mclass");
if (isV7)
Features.AddFeature("hwdiv");
break;
}
}
if (Attributes.hasAttribute(ARMBuildAttrs::THUMB_ISA_use)) {
switch(Attributes.getAttributeValue(ARMBuildAttrs::THUMB_ISA_use)) {
default:
break;
case ARMBuildAttrs::Not_Allowed:
Features.AddFeature("thumb", false);
Features.AddFeature("thumb2", false);
break;
case ARMBuildAttrs::AllowThumb32:
Features.AddFeature("thumb2");
break;
}
}
if (Attributes.hasAttribute(ARMBuildAttrs::FP_arch)) {
switch(Attributes.getAttributeValue(ARMBuildAttrs::FP_arch)) {
default:
break;
case ARMBuildAttrs::Not_Allowed:
Features.AddFeature("vfp2", false);
Features.AddFeature("vfp3", false);
Features.AddFeature("vfp4", false);
break;
case ARMBuildAttrs::AllowFPv2:
Features.AddFeature("vfp2");
break;
case ARMBuildAttrs::AllowFPv3A:
case ARMBuildAttrs::AllowFPv3B:
Features.AddFeature("vfp3");
break;
case ARMBuildAttrs::AllowFPv4A:
case ARMBuildAttrs::AllowFPv4B:
Features.AddFeature("vfp4");
break;
}
}
if (Attributes.hasAttribute(ARMBuildAttrs::Advanced_SIMD_arch)) {
switch(Attributes.getAttributeValue(ARMBuildAttrs::Advanced_SIMD_arch)) {
default:
break;
case ARMBuildAttrs::Not_Allowed:
Features.AddFeature("neon", false);
Features.AddFeature("fp16", false);
break;
case ARMBuildAttrs::AllowNeon:
Features.AddFeature("neon");
break;
case ARMBuildAttrs::AllowNeon2:
Features.AddFeature("neon");
Features.AddFeature("fp16");
break;
}
}
if (Attributes.hasAttribute(ARMBuildAttrs::DIV_use)) {
switch(Attributes.getAttributeValue(ARMBuildAttrs::DIV_use)) {
default:
break;
case ARMBuildAttrs::DisallowDIV:
Features.AddFeature("hwdiv", false);
Features.AddFeature("hwdiv-arm", false);
break;
case ARMBuildAttrs::AllowDIVExt:
Features.AddFeature("hwdiv");
Features.AddFeature("hwdiv-arm");
break;
}
}
return Features;
}
