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https://github.com/c64scene-ar/llvm-6502.git
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f3d745cdc9
This lets us pass the symbol to the constructor and avoid the mutable field. This also opens the way for outputting the symbol only when needed, instead of outputting them at the start of the file. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231859 91177308-0d34-0410-b5e6-96231b3b80d8
273 lines
10 KiB
C++
273 lines
10 KiB
C++
//===- lib/MC/MCSectionMachO.cpp - MachO Code Section Representation ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cctype>
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using namespace llvm;
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/// SectionTypeDescriptors - These are strings that describe the various section
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/// types. This *must* be kept in order with and stay synchronized with the
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/// section type list.
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static const struct {
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const char *AssemblerName, *EnumName;
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} SectionTypeDescriptors[MachO::LAST_KNOWN_SECTION_TYPE+1] = {
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{ "regular", "S_REGULAR" }, // 0x00
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{ nullptr, "S_ZEROFILL" }, // 0x01
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{ "cstring_literals", "S_CSTRING_LITERALS" }, // 0x02
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{ "4byte_literals", "S_4BYTE_LITERALS" }, // 0x03
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{ "8byte_literals", "S_8BYTE_LITERALS" }, // 0x04
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{ "literal_pointers", "S_LITERAL_POINTERS" }, // 0x05
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{ "non_lazy_symbol_pointers", "S_NON_LAZY_SYMBOL_POINTERS" }, // 0x06
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{ "lazy_symbol_pointers", "S_LAZY_SYMBOL_POINTERS" }, // 0x07
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{ "symbol_stubs", "S_SYMBOL_STUBS" }, // 0x08
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{ "mod_init_funcs", "S_MOD_INIT_FUNC_POINTERS" }, // 0x09
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{ "mod_term_funcs", "S_MOD_TERM_FUNC_POINTERS" }, // 0x0A
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{ "coalesced", "S_COALESCED" }, // 0x0B
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{ nullptr, /*FIXME??*/ "S_GB_ZEROFILL" }, // 0x0C
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{ "interposing", "S_INTERPOSING" }, // 0x0D
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{ "16byte_literals", "S_16BYTE_LITERALS" }, // 0x0E
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{ nullptr, /*FIXME??*/ "S_DTRACE_DOF" }, // 0x0F
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{ nullptr, /*FIXME??*/ "S_LAZY_DYLIB_SYMBOL_POINTERS" }, // 0x10
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{ "thread_local_regular", "S_THREAD_LOCAL_REGULAR" }, // 0x11
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{ "thread_local_zerofill", "S_THREAD_LOCAL_ZEROFILL" }, // 0x12
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{ "thread_local_variables", "S_THREAD_LOCAL_VARIABLES" }, // 0x13
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{ "thread_local_variable_pointers",
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"S_THREAD_LOCAL_VARIABLE_POINTERS" }, // 0x14
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{ "thread_local_init_function_pointers",
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"S_THREAD_LOCAL_INIT_FUNCTION_POINTERS"}, // 0x15
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};
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/// SectionAttrDescriptors - This is an array of descriptors for section
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/// attributes. Unlike the SectionTypeDescriptors, this is not directly indexed
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/// by attribute, instead it is searched.
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static const struct {
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unsigned AttrFlag;
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const char *AssemblerName, *EnumName;
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} SectionAttrDescriptors[] = {
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#define ENTRY(ASMNAME, ENUM) \
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{ MachO::ENUM, ASMNAME, #ENUM },
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ENTRY("pure_instructions", S_ATTR_PURE_INSTRUCTIONS)
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ENTRY("no_toc", S_ATTR_NO_TOC)
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ENTRY("strip_static_syms", S_ATTR_STRIP_STATIC_SYMS)
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ENTRY("no_dead_strip", S_ATTR_NO_DEAD_STRIP)
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ENTRY("live_support", S_ATTR_LIVE_SUPPORT)
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ENTRY("self_modifying_code", S_ATTR_SELF_MODIFYING_CODE)
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ENTRY("debug", S_ATTR_DEBUG)
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ENTRY(nullptr /*FIXME*/, S_ATTR_SOME_INSTRUCTIONS)
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ENTRY(nullptr /*FIXME*/, S_ATTR_EXT_RELOC)
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ENTRY(nullptr /*FIXME*/, S_ATTR_LOC_RELOC)
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#undef ENTRY
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{ 0, "none", nullptr }, // used if section has no attributes but has a stub size
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};
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MCSectionMachO::MCSectionMachO(StringRef Segment, StringRef Section,
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unsigned TAA, unsigned reserved2, SectionKind K,
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MCSymbol *Begin)
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: MCSection(SV_MachO, K, Begin), TypeAndAttributes(TAA),
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Reserved2(reserved2) {
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assert(Segment.size() <= 16 && Section.size() <= 16 &&
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"Segment or section string too long");
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for (unsigned i = 0; i != 16; ++i) {
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if (i < Segment.size())
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SegmentName[i] = Segment[i];
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else
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SegmentName[i] = 0;
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if (i < Section.size())
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SectionName[i] = Section[i];
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else
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SectionName[i] = 0;
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}
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}
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void MCSectionMachO::PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS,
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const MCExpr *Subsection) const {
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OS << "\t.section\t" << getSegmentName() << ',' << getSectionName();
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// Get the section type and attributes.
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unsigned TAA = getTypeAndAttributes();
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if (TAA == 0) {
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OS << '\n';
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return;
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}
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MachO::SectionType SectionType = getType();
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assert(SectionType <= MachO::LAST_KNOWN_SECTION_TYPE &&
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"Invalid SectionType specified!");
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if (SectionTypeDescriptors[SectionType].AssemblerName) {
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OS << ',';
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OS << SectionTypeDescriptors[SectionType].AssemblerName;
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} else {
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// If we have no name for the attribute, stop here.
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OS << '\n';
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return;
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}
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// If we don't have any attributes, we're done.
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unsigned SectionAttrs = TAA & MachO::SECTION_ATTRIBUTES;
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if (SectionAttrs == 0) {
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// If we have a S_SYMBOL_STUBS size specified, print it along with 'none' as
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// the attribute specifier.
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if (Reserved2 != 0)
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OS << ",none," << Reserved2;
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OS << '\n';
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return;
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}
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// Check each attribute to see if we have it.
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char Separator = ',';
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for (unsigned i = 0;
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SectionAttrs != 0 && SectionAttrDescriptors[i].AttrFlag;
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++i) {
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// Check to see if we have this attribute.
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if ((SectionAttrDescriptors[i].AttrFlag & SectionAttrs) == 0)
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continue;
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// Yep, clear it and print it.
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SectionAttrs &= ~SectionAttrDescriptors[i].AttrFlag;
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OS << Separator;
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if (SectionAttrDescriptors[i].AssemblerName)
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OS << SectionAttrDescriptors[i].AssemblerName;
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else
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OS << "<<" << SectionAttrDescriptors[i].EnumName << ">>";
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Separator = '+';
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}
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assert(SectionAttrs == 0 && "Unknown section attributes!");
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// If we have a S_SYMBOL_STUBS size specified, print it.
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if (Reserved2 != 0)
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OS << ',' << Reserved2;
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OS << '\n';
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}
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bool MCSectionMachO::UseCodeAlign() const {
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return hasAttribute(MachO::S_ATTR_PURE_INSTRUCTIONS);
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}
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bool MCSectionMachO::isVirtualSection() const {
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return (getType() == MachO::S_ZEROFILL ||
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getType() == MachO::S_GB_ZEROFILL ||
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getType() == MachO::S_THREAD_LOCAL_ZEROFILL);
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}
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/// ParseSectionSpecifier - Parse the section specifier indicated by "Spec".
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/// This is a string that can appear after a .section directive in a mach-o
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/// flavored .s file. If successful, this fills in the specified Out
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/// parameters and returns an empty string. When an invalid section
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/// specifier is present, this returns a string indicating the problem.
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std::string MCSectionMachO::ParseSectionSpecifier(StringRef Spec, // In.
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StringRef &Segment, // Out.
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StringRef &Section, // Out.
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unsigned &TAA, // Out.
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bool &TAAParsed, // Out.
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unsigned &StubSize) { // Out.
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TAAParsed = false;
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SmallVector<StringRef, 5> SplitSpec;
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Spec.split(SplitSpec, ",");
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// Remove leading and trailing whitespace.
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auto GetEmptyOrTrim = [&SplitSpec](size_t Idx) -> StringRef {
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return SplitSpec.size() > Idx ? SplitSpec[Idx].trim() : StringRef();
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};
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Segment = GetEmptyOrTrim(0);
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Section = GetEmptyOrTrim(1);
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StringRef SectionType = GetEmptyOrTrim(2);
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StringRef Attrs = GetEmptyOrTrim(3);
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StringRef StubSizeStr = GetEmptyOrTrim(4);
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// Verify that the segment is present and not too long.
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if (Segment.empty() || Segment.size() > 16)
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return "mach-o section specifier requires a segment whose length is "
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"between 1 and 16 characters";
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// Verify that the section is present and not too long.
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if (Section.empty())
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return "mach-o section specifier requires a segment and section "
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"separated by a comma";
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if (Section.size() > 16)
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return "mach-o section specifier requires a section whose length is "
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"between 1 and 16 characters";
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// If there is no comma after the section, we're done.
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TAA = 0;
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StubSize = 0;
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if (SectionType.empty())
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return "";
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// Figure out which section type it is.
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auto TypeDescriptor = std::find_if(
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std::begin(SectionTypeDescriptors), std::end(SectionTypeDescriptors),
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[&](decltype(*SectionTypeDescriptors) &Descriptor) {
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return Descriptor.AssemblerName &&
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SectionType == Descriptor.AssemblerName;
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});
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// If we didn't find the section type, reject it.
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if (TypeDescriptor == std::end(SectionTypeDescriptors))
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return "mach-o section specifier uses an unknown section type";
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// Remember the TypeID.
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TAA = TypeDescriptor - std::begin(SectionTypeDescriptors);
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TAAParsed = true;
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// If we have no comma after the section type, there are no attributes.
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if (Attrs.empty()) {
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// S_SYMBOL_STUBS always require a symbol stub size specifier.
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if (TAA == MachO::S_SYMBOL_STUBS)
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return "mach-o section specifier of type 'symbol_stubs' requires a size "
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"specifier";
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return "";
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}
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// The attribute list is a '+' separated list of attributes.
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SmallVector<StringRef, 1> SectionAttrs;
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Attrs.split(SectionAttrs, "+", /*MaxSplit=*/-1, /*KeepEmpty=*/false);
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for (StringRef &SectionAttr : SectionAttrs) {
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auto AttrDescriptorI = std::find_if(
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std::begin(SectionAttrDescriptors), std::end(SectionAttrDescriptors),
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[&](decltype(*SectionAttrDescriptors) &Descriptor) {
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return Descriptor.AssemblerName &&
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SectionAttr.trim() == Descriptor.AssemblerName;
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});
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if (AttrDescriptorI == std::end(SectionAttrDescriptors))
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return "mach-o section specifier has invalid attribute";
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TAA |= AttrDescriptorI->AttrFlag;
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}
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// Okay, we've parsed the section attributes, see if we have a stub size spec.
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if (StubSizeStr.empty()) {
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// S_SYMBOL_STUBS always require a symbol stub size specifier.
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if (TAA == MachO::S_SYMBOL_STUBS)
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return "mach-o section specifier of type 'symbol_stubs' requires a size "
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"specifier";
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return "";
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}
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// If we have a stub size spec, we must have a sectiontype of S_SYMBOL_STUBS.
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if ((TAA & MachO::SECTION_TYPE) != MachO::S_SYMBOL_STUBS)
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return "mach-o section specifier cannot have a stub size specified because "
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"it does not have type 'symbol_stubs'";
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// Convert the stub size from a string to an integer.
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if (StubSizeStr.getAsInteger(0, StubSize))
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return "mach-o section specifier has a malformed stub size";
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return "";
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}
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