//===- lib/MC/MCSectionMachO.cpp - MachO Code Section Representation ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
using namespace llvm;
/// SectionTypeDescriptors - These are strings that describe the various section
/// types. This *must* be kept in order with and stay synchronized with the
/// section type list.
static const struct {
const char *AssemblerName, *EnumName;
} SectionTypeDescriptors[MCSectionMachO::LAST_KNOWN_SECTION_TYPE+1] = {
{ "regular", "S_REGULAR" }, // 0x00
{ 0, "S_ZEROFILL" }, // 0x01
{ "cstring_literals", "S_CSTRING_LITERALS" }, // 0x02
{ "4byte_literals", "S_4BYTE_LITERALS" }, // 0x03
{ "8byte_literals", "S_8BYTE_LITERALS" }, // 0x04
{ "literal_pointers", "S_LITERAL_POINTERS" }, // 0x05
{ "non_lazy_symbol_pointers", "S_NON_LAZY_SYMBOL_POINTERS" }, // 0x06
{ "lazy_symbol_pointers", "S_LAZY_SYMBOL_POINTERS" }, // 0x07
{ "symbol_stubs", "S_SYMBOL_STUBS" }, // 0x08
{ "mod_init_funcs", "S_MOD_INIT_FUNC_POINTERS" }, // 0x09
{ "mod_term_funcs", "S_MOD_TERM_FUNC_POINTERS" }, // 0x0A
{ "coalesced", "S_COALESCED" }, // 0x0B
{ 0, /*FIXME??*/ "S_GB_ZEROFILL" }, // 0x0C
{ "interposing", "S_INTERPOSING" }, // 0x0D
{ "16byte_literals", "S_16BYTE_LITERALS" }, // 0x0E
{ 0, /*FIXME??*/ "S_DTRACE_DOF" }, // 0x0F
{ 0, /*FIXME??*/ "S_LAZY_DYLIB_SYMBOL_POINTERS" }, // 0x10
{ "thread_local_regular", "S_THREAD_LOCAL_REGULAR" }, // 0x11
{ "thread_local_zerofill", "S_THREAD_LOCAL_ZEROFILL" }, // 0x12
{ "thread_local_variables", "S_THREAD_LOCAL_VARIABLES" }, // 0x13
{ "thread_local_variable_pointers",
"S_THREAD_LOCAL_VARIABLE_POINTERS" }, // 0x14
{ "thread_local_init_function_pointers",
"S_THREAD_LOCAL_INIT_FUNCTION_POINTERS"}, // 0x15
};
/// SectionAttrDescriptors - This is an array of descriptors for section
/// attributes. Unlike the SectionTypeDescriptors, this is not directly indexed
/// by attribute, instead it is searched. The last entry has an AttrFlagEnd
/// AttrFlag value.
static const struct {
unsigned AttrFlag;
const char *AssemblerName, *EnumName;
} SectionAttrDescriptors[] = {
#define ENTRY(ASMNAME, ENUM) \
{ MCSectionMachO::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(0 /*FIXME*/, S_ATTR_SOME_INSTRUCTIONS)
ENTRY(0 /*FIXME*/, S_ATTR_EXT_RELOC)
ENTRY(0 /*FIXME*/, S_ATTR_LOC_RELOC)
#undef ENTRY
{ 0, "none", 0 }, // used if section has no attributes but has a stub size
#define AttrFlagEnd 0xffffffff // non legal value, multiple attribute bits set
{ AttrFlagEnd, 0, 0 }
};
MCSectionMachO::MCSectionMachO(StringRef Segment, StringRef Section,
unsigned TAA, unsigned reserved2, SectionKind K)
: MCSection(SV_MachO, K), 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 {
OS << "\t.section\t" << getSegmentName() << ',' << getSectionName();
// Get the section type and attributes.
unsigned TAA = getTypeAndAttributes();
if (TAA == 0) {
OS << '\n';
return;
}
unsigned SectionType = TAA & MCSectionMachO::SECTION_TYPE;
assert(SectionType <= MCSectionMachO::LAST_KNOWN_SECTION_TYPE &&
"Invalid SectionType specified!");
if (SectionTypeDescriptors[SectionType].AssemblerName) {
OS << ',';
OS << SectionTypeDescriptors[SectionType].AssemblerName;
} else {
// If we have no name for the attribute, stop here.
OS << '\n';
return;
}
// If we don't have any attributes, we're done.
unsigned SectionAttrs = TAA & MCSectionMachO::SECTION_ATTRIBUTES;
if (SectionAttrs == 0) {
// If we have a S_SYMBOL_STUBS size specified, print it along with 'none' as
// the attribute specifier.
if (Reserved2 != 0)
OS << ",none," << Reserved2;
OS << '\n';
return;
}
// Check each attribute to see if we have it.
char Separator = ',';
for (unsigned i = 0;
SectionAttrs != 0 && SectionAttrDescriptors[i].AttrFlag;
++i) {
// Check to see if we have this attribute.
if ((SectionAttrDescriptors[i].AttrFlag & SectionAttrs) == 0)
continue;
// Yep, clear it and print it.
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 we have a S_SYMBOL_STUBS size specified, print it.
if (Reserved2 != 0)
OS << ',' << Reserved2;
OS << '\n';
}
bool MCSectionMachO::UseCodeAlign() const {
return hasAttribute(MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
}
bool MCSectionMachO::isVirtualSection() const {
return (getType() == MCSectionMachO::S_ZEROFILL ||
getType() == MCSectionMachO::S_GB_ZEROFILL ||
getType() == MCSectionMachO::S_THREAD_LOCAL_ZEROFILL);
}
/// StripSpaces - This removes leading and trailing spaces from the StringRef.
static void StripSpaces(StringRef &Str) {
while (!Str.empty() && isspace(Str[0]))
Str = Str.substr(1);
while (!Str.empty() && isspace(Str.back()))
Str = Str.substr(0, Str.size()-1);
}
/// ParseSectionSpecifier - Parse the section specifier indicated by "Spec".
/// This is a string that can appear after a .section directive in a mach-o
/// flavored .s file. If successful, this fills in the specified Out
/// parameters and returns an empty string. When an invalid section
/// specifier is present, this returns a string indicating the problem.
std::string MCSectionMachO::ParseSectionSpecifier(StringRef Spec, // In.
StringRef &Segment, // Out.
StringRef &Section, // Out.
unsigned &TAA, // Out.
bool &TAAParsed, // Out.
unsigned &StubSize) { // Out.
TAAParsed = false;
// Find the first comma.
std::pair<StringRef, StringRef> Comma = Spec.split(',');
// If there is no comma, we fail.
if (Comma.second.empty())
return "mach-o section specifier requires a segment and section "
"separated by a comma";
// Capture segment, remove leading and trailing whitespace.
Segment = Comma.first;
StripSpaces(Segment);
// Verify that the segment is present and not too long.
if (Segment.empty() || Segment.size() > 16)
return "mach-o section specifier requires a segment whose length is "
"between 1 and 16 characters";
// Split the section name off from any attributes if present.
Comma = Comma.second.split(',');
// Capture section, remove leading and trailing whitespace.
Section = Comma.first;
StripSpaces(Section);
// Verify that the section is present and not too long.
if (Section.empty() || Section.size() > 16)
return "mach-o section specifier requires a section whose length is "
"between 1 and 16 characters";
// If there is no comma after the section, we're done.
TAA = 0;
StubSize = 0;
if (Comma.second.empty())
return "";
// Otherwise, we need to parse the section type and attributes.
Comma = Comma.second.split(',');
// Get the section type.
StringRef SectionType = Comma.first;
StripSpaces(SectionType);
// Figure out which section type it is.
unsigned TypeID;
for (TypeID = 0; TypeID !=MCSectionMachO::LAST_KNOWN_SECTION_TYPE+1; ++TypeID)
if (SectionTypeDescriptors[TypeID].AssemblerName &&
SectionType == SectionTypeDescriptors[TypeID].AssemblerName)
break;
// If we didn't find the section type, reject it.
if (TypeID > MCSectionMachO::LAST_KNOWN_SECTION_TYPE)
return "mach-o section specifier uses an unknown section type";
// Remember the TypeID.
TAA = TypeID;
TAAParsed = true;
// If we have no comma after the section type, there are no attributes.
if (Comma.second.empty()) {
// S_SYMBOL_STUBS always require a symbol stub size specifier.
if (TAA == MCSectionMachO::S_SYMBOL_STUBS)
return "mach-o section specifier of type 'symbol_stubs' requires a size "
"specifier";
return "";
}
// Otherwise, we do have some attributes. Split off the size specifier if
// present.
Comma = Comma.second.split(',');
StringRef Attrs = Comma.first;
// The attribute list is a '+' separated list of attributes.
std::pair<StringRef, StringRef> Plus = Attrs.split('+');
while (1) {
StringRef Attr = Plus.first;
StripSpaces(Attr);
// Look up the attribute.
for (unsigned i = 0; ; ++i) {
if (SectionAttrDescriptors[i].AttrFlag == AttrFlagEnd)
return "mach-o section specifier has invalid attribute";
if (SectionAttrDescriptors[i].AssemblerName &&
Attr == SectionAttrDescriptors[i].AssemblerName) {
TAA |= SectionAttrDescriptors[i].AttrFlag;
break;
}
}
if (Plus.second.empty()) break;
Plus = Plus.second.split('+');
};
// Okay, we've parsed the section attributes, see if we have a stub size spec.
if (Comma.second.empty()) {
// S_SYMBOL_STUBS always require a symbol stub size specifier.
if (TAA == MCSectionMachO::S_SYMBOL_STUBS)
return "mach-o section specifier of type 'symbol_stubs' requires a size "
"specifier";
return "";
}
// If we have a stub size spec, we must have a sectiontype of S_SYMBOL_STUBS.
if ((TAA & MCSectionMachO::SECTION_TYPE) != MCSectionMachO::S_SYMBOL_STUBS)
return "mach-o section specifier cannot have a stub size specified because "
"it does not have type 'symbol_stubs'";
// Okay, if we do, it must be a number.
StringRef StubSizeStr = Comma.second;
StripSpaces(StubSizeStr);
// Convert the stub size from a string to an integer.
if (StubSizeStr.getAsInteger(0, StubSize))
return "mach-o section specifier has a malformed stub size";
return "";
}