MCSectionMachO.cpp [plain text]
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
using namespace llvm;
static const struct {
const char *AssemblerName, *EnumName;
} SectionTypeDescriptors[MachO::LAST_KNOWN_SECTION_TYPE+1] = {
{ "regular", "S_REGULAR" }, { nullptr, "S_ZEROFILL" }, { "cstring_literals", "S_CSTRING_LITERALS" }, { "4byte_literals", "S_4BYTE_LITERALS" }, { "8byte_literals", "S_8BYTE_LITERALS" }, { "literal_pointers", "S_LITERAL_POINTERS" }, { "non_lazy_symbol_pointers", "S_NON_LAZY_SYMBOL_POINTERS" }, { "lazy_symbol_pointers", "S_LAZY_SYMBOL_POINTERS" }, { "symbol_stubs", "S_SYMBOL_STUBS" }, { "mod_init_funcs", "S_MOD_INIT_FUNC_POINTERS" }, { "mod_term_funcs", "S_MOD_TERM_FUNC_POINTERS" }, { "coalesced", "S_COALESCED" }, { nullptr, "S_GB_ZEROFILL" }, { "interposing", "S_INTERPOSING" }, { "16byte_literals", "S_16BYTE_LITERALS" }, { nullptr, "S_DTRACE_DOF" }, { nullptr, "S_LAZY_DYLIB_SYMBOL_POINTERS" }, { "thread_local_regular", "S_THREAD_LOCAL_REGULAR" }, { "thread_local_zerofill", "S_THREAD_LOCAL_ZEROFILL" }, { "thread_local_variables", "S_THREAD_LOCAL_VARIABLES" }, { "thread_local_variable_pointers",
"S_THREAD_LOCAL_VARIABLE_POINTERS" }, { "thread_local_init_function_pointers",
"S_THREAD_LOCAL_INIT_FUNCTION_POINTERS"}, };
static const struct {
unsigned AttrFlag;
const char *AssemblerName, *EnumName;
} SectionAttrDescriptors[] = {
#define ENTRY(ASMNAME, ENUM) \
{ MachO::ENUM, ASMNAME, #ENUM },
ENTRY("pure_instructions", S_ATTR_PURE_INSTRUCTIONS)
ENTRY("no_toc", S_ATTR_NO_TOC)
ENTRY("strip_static_syms", S_ATTR_STRIP_STATIC_SYMS)
ENTRY("no_dead_strip", S_ATTR_NO_DEAD_STRIP)
ENTRY("live_support", S_ATTR_LIVE_SUPPORT)
ENTRY("self_modifying_code", S_ATTR_SELF_MODIFYING_CODE)
ENTRY("debug", S_ATTR_DEBUG)
ENTRY(nullptr , S_ATTR_SOME_INSTRUCTIONS)
ENTRY(nullptr , S_ATTR_EXT_RELOC)
ENTRY(nullptr , S_ATTR_LOC_RELOC)
#undef ENTRY
{ 0, "none", nullptr }, };
MCSectionMachO::MCSectionMachO(StringRef Segment, StringRef Section,
unsigned TAA, unsigned reserved2, SectionKind K,
MCSymbol *Begin)
: MCSection(SV_MachO, K, Begin), TypeAndAttributes(TAA),
Reserved2(reserved2) {
assert(Segment.size() <= 16 && Section.size() <= 16 &&
"Segment or section string too long");
for (unsigned i = 0; i != 16; ++i) {
if (i < Segment.size())
SegmentName[i] = Segment[i];
else
SegmentName[i] = 0;
if (i < Section.size())
SectionName[i] = Section[i];
else
SectionName[i] = 0;
}
}
void MCSectionMachO::PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS,
const MCExpr *Subsection) const {
OS << "\t.section\t" << getSegmentName() << ',' << getSectionName();
unsigned TAA = getTypeAndAttributes();
if (TAA == 0) {
OS << '\n';
return;
}
MachO::SectionType SectionType = getType();
assert(SectionType <= MachO::LAST_KNOWN_SECTION_TYPE &&
"Invalid SectionType specified!");
if (SectionTypeDescriptors[SectionType].AssemblerName) {
OS << ',';
OS << SectionTypeDescriptors[SectionType].AssemblerName;
} else {
OS << '\n';
return;
}
unsigned SectionAttrs = TAA & MachO::SECTION_ATTRIBUTES;
if (SectionAttrs == 0) {
if (Reserved2 != 0)
OS << ",none," << Reserved2;
OS << '\n';
return;
}
char Separator = ',';
for (unsigned i = 0;
SectionAttrs != 0 && SectionAttrDescriptors[i].AttrFlag;
++i) {
if ((SectionAttrDescriptors[i].AttrFlag & SectionAttrs) == 0)
continue;
SectionAttrs &= ~SectionAttrDescriptors[i].AttrFlag;
OS << Separator;
if (SectionAttrDescriptors[i].AssemblerName)
OS << SectionAttrDescriptors[i].AssemblerName;
else
OS << "<<" << SectionAttrDescriptors[i].EnumName << ">>";
Separator = '+';
}
assert(SectionAttrs == 0 && "Unknown section attributes!");
if (Reserved2 != 0)
OS << ',' << Reserved2;
OS << '\n';
}
bool MCSectionMachO::UseCodeAlign() const {
return hasAttribute(MachO::S_ATTR_PURE_INSTRUCTIONS);
}
bool MCSectionMachO::isVirtualSection() const {
return (getType() == MachO::S_ZEROFILL ||
getType() == MachO::S_GB_ZEROFILL ||
getType() == MachO::S_THREAD_LOCAL_ZEROFILL);
}
std::string MCSectionMachO::ParseSectionSpecifier(StringRef Spec, StringRef &Segment, StringRef &Section, unsigned &TAA, bool &TAAParsed, unsigned &StubSize) { TAAParsed = false;
SmallVector<StringRef, 5> SplitSpec;
Spec.split(SplitSpec, ',');
auto GetEmptyOrTrim = [&SplitSpec](size_t Idx) -> StringRef {
return SplitSpec.size() > Idx ? SplitSpec[Idx].trim() : StringRef();
};
Segment = GetEmptyOrTrim(0);
Section = GetEmptyOrTrim(1);
StringRef SectionType = GetEmptyOrTrim(2);
StringRef Attrs = GetEmptyOrTrim(3);
StringRef StubSizeStr = GetEmptyOrTrim(4);
if (Segment.empty() || Segment.size() > 16)
return "mach-o section specifier requires a segment whose length is "
"between 1 and 16 characters";
if (Section.empty())
return "mach-o section specifier requires a segment and section "
"separated by a comma";
if (Section.size() > 16)
return "mach-o section specifier requires a section whose length is "
"between 1 and 16 characters";
TAA = 0;
StubSize = 0;
if (SectionType.empty())
return "";
auto TypeDescriptor = std::find_if(
std::begin(SectionTypeDescriptors), std::end(SectionTypeDescriptors),
[&](decltype(*SectionTypeDescriptors) &Descriptor) {
return Descriptor.AssemblerName &&
SectionType == Descriptor.AssemblerName;
});
if (TypeDescriptor == std::end(SectionTypeDescriptors))
return "mach-o section specifier uses an unknown section type";
TAA = TypeDescriptor - std::begin(SectionTypeDescriptors);
TAAParsed = true;
if (Attrs.empty()) {
if (TAA == MachO::S_SYMBOL_STUBS)
return "mach-o section specifier of type 'symbol_stubs' requires a size "
"specifier";
return "";
}
SmallVector<StringRef, 1> SectionAttrs;
Attrs.split(SectionAttrs, '+', -1, false);
for (StringRef &SectionAttr : SectionAttrs) {
auto AttrDescriptorI = std::find_if(
std::begin(SectionAttrDescriptors), std::end(SectionAttrDescriptors),
[&](decltype(*SectionAttrDescriptors) &Descriptor) {
return Descriptor.AssemblerName &&
SectionAttr.trim() == Descriptor.AssemblerName;
});
if (AttrDescriptorI == std::end(SectionAttrDescriptors))
return "mach-o section specifier has invalid attribute";
TAA |= AttrDescriptorI->AttrFlag;
}
if (StubSizeStr.empty()) {
if (TAA == MachO::S_SYMBOL_STUBS)
return "mach-o section specifier of type 'symbol_stubs' requires a size "
"specifier";
return "";
}
if ((TAA & MachO::SECTION_TYPE) != MachO::S_SYMBOL_STUBS)
return "mach-o section specifier cannot have a stub size specified because "
"it does not have type 'symbol_stubs'";
if (StubSizeStr.getAsInteger(0, StubSize))
return "mach-o section specifier has a malformed stub size";
return "";
}