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//===- MCAsmInfoELF.cpp - ELF asm properties ------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines target asm properties related what form asm statements
// should take in general on ELF-based targets
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCAsmInfoELF.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TargetParser/Triple.h"
#include <cassert>
using namespace llvm;
void MCAsmInfoELF::anchor() {}
MCSection *MCAsmInfoELF::getNonexecutableStackSection(MCContext &Ctx) const {
// Solaris doesn't know/doesn't care about .note.GNU-stack sections, so
// don't emit them.
if (Ctx.getTargetTriple().isOSSolaris())
return nullptr;
return Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS, 0);
}
bool MCAsmInfoELF::useCodeAlign(const MCSection &Sec) const {
return static_cast<const MCSectionELF &>(Sec).getFlags() & ELF::SHF_EXECINSTR;
}
MCAsmInfoELF::MCAsmInfoELF() {
HasIdentDirective = true;
WeakRefDirective = "\t.weak\t";
PrivateGlobalPrefix = ".L";
PrivateLabelPrefix = ".L";
}
static void printName(raw_ostream &OS, StringRef Name) {
if (Name.find_first_not_of("0123456789_."
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) {
OS << Name;
return;
}
OS << '"';
for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) {
if (*B == '"') // Unquoted "
OS << "\\\"";
else if (*B != '\\') // Neither " or backslash
OS << *B;
else if (B + 1 == E) // Trailing backslash
OS << "\\\\";
else {
OS << B[0] << B[1]; // Quoted character
++B;
}
}
OS << '"';
}
void MCAsmInfoELF::printSwitchToSection(const MCSection &Section,
uint32_t Subsection, const Triple &T,
raw_ostream &OS) const {
auto &Sec = static_cast<const MCSectionELF &>(Section);
if (!Sec.isUnique() && shouldOmitSectionDirective(Sec.getName())) {
OS << '\t' << Sec.getName();
if (Subsection)
OS << '\t' << Subsection;
OS << '\n';
return;
}
OS << "\t.section\t";
printName(OS, Sec.getName());
// Handle the weird solaris syntax if desired.
if (usesSunStyleELFSectionSwitchSyntax() && !(Sec.Flags & ELF::SHF_MERGE)) {
if (Sec.Flags & ELF::SHF_ALLOC)
OS << ",#alloc";
if (Sec.Flags & ELF::SHF_EXECINSTR)
OS << ",#execinstr";
if (Sec.Flags & ELF::SHF_WRITE)
OS << ",#write";
if (Sec.Flags & ELF::SHF_EXCLUDE)
OS << ",#exclude";
if (Sec.Flags & ELF::SHF_TLS)
OS << ",#tls";
OS << '\n';
return;
}
OS << ",\"";
if (Sec.Flags & ELF::SHF_ALLOC)
OS << 'a';
if (Sec.Flags & ELF::SHF_EXCLUDE)
OS << 'e';
if (Sec.Flags & ELF::SHF_EXECINSTR)
OS << 'x';
if (Sec.Flags & ELF::SHF_WRITE)
OS << 'w';
if (Sec.Flags & ELF::SHF_MERGE)
OS << 'M';
if (Sec.Flags & ELF::SHF_STRINGS)
OS << 'S';
if (Sec.Flags & ELF::SHF_TLS)
OS << 'T';
if (Sec.Flags & ELF::SHF_LINK_ORDER)
OS << 'o';
if (Sec.Flags & ELF::SHF_GROUP)
OS << 'G';
if (Sec.Flags & ELF::SHF_GNU_RETAIN)
OS << 'R';
// If there are os-specific flags, print them.
if (T.isOSSolaris())
if (Sec.Flags & ELF::SHF_SUNW_NODISCARD)
OS << 'R';
// If there are tarSec.get-specific flags, print them.
Triple::ArchType Arch = T.getArch();
if (Arch == Triple::xcore) {
if (Sec.Flags & ELF::XCORE_SHF_CP_SECTION)
OS << 'c';
if (Sec.Flags & ELF::XCORE_SHF_DP_SECTION)
OS << 'd';
} else if (T.isARM() || T.isThumb()) {
if (Sec.Flags & ELF::SHF_ARM_PURECODE)
OS << 'y';
} else if (T.isAArch64()) {
if (Sec.Flags & ELF::SHF_AARCH64_PURECODE)
OS << 'y';
} else if (Arch == Triple::hexagon) {
if (Sec.Flags & ELF::SHF_HEX_GPREL)
OS << 's';
} else if (Arch == Triple::x86_64) {
if (Sec.Flags & ELF::SHF_X86_64_LARGE)
OS << 'l';
}
OS << '"';
OS << ',';
// If comment string is '@', e.g. as on ARM - use '%' instead
if (getCommentString()[0] == '@')
OS << '%';
else
OS << '@';
if (Sec.Type == ELF::SHT_INIT_ARRAY)
OS << "init_array";
else if (Sec.Type == ELF::SHT_FINI_ARRAY)
OS << "fini_array";
else if (Sec.Type == ELF::SHT_PREINIT_ARRAY)
OS << "preinit_array";
else if (Sec.Type == ELF::SHT_NOBITS)
OS << "nobits";
else if (Sec.Type == ELF::SHT_NOTE)
OS << "note";
else if (Sec.Type == ELF::SHT_PROGBITS)
OS << "progbits";
else if (Sec.Type == ELF::SHT_X86_64_UNWIND)
OS << "unwind";
else if (Sec.Type == ELF::SHT_MIPS_DWARF)
// Print hex value of the flag while we do not have
// any standard symbolic representation of the flag.
OS << "0x7000001e";
else if (Sec.Type == ELF::SHT_LLVM_ODRTAB)
OS << "llvm_odrtab";
else if (Sec.Type == ELF::SHT_LLVM_LINKER_OPTIONS)
OS << "llvm_linker_options";
else if (Sec.Type == ELF::SHT_LLVM_CALL_GRAPH_PROFILE)
OS << "llvm_call_graph_profile";
else if (Sec.Type == ELF::SHT_LLVM_DEPENDENT_LIBRARIES)
OS << "llvm_dependent_libraries";
else if (Sec.Type == ELF::SHT_LLVM_SYMPART)
OS << "llvm_sympart";
else if (Sec.Type == ELF::SHT_LLVM_BB_ADDR_MAP)
OS << "llvm_bb_addr_map";
else if (Sec.Type == ELF::SHT_LLVM_OFFLOADING)
OS << "llvm_offloading";
else if (Sec.Type == ELF::SHT_LLVM_LTO)
OS << "llvm_lto";
else if (Sec.Type == ELF::SHT_LLVM_JT_SIZES)
OS << "llvm_jt_sizes";
else if (Sec.Type == ELF::SHT_LLVM_CFI_JUMP_TABLE)
OS << "llvm_cfi_jump_table";
else
OS << "0x" << Twine::utohexstr(Sec.Type);
if (Sec.EntrySize) {
assert((Sec.Flags & ELF::SHF_MERGE) ||
Sec.Type == ELF::SHT_LLVM_CFI_JUMP_TABLE);
OS << "," << Sec.EntrySize;
}
if (Sec.Flags & ELF::SHF_LINK_ORDER) {
OS << ",";
if (Sec.LinkedToSym)
printName(OS, Sec.LinkedToSym->getName());
else
OS << '0';
}
if (Sec.Flags & ELF::SHF_GROUP) {
OS << ",";
printName(OS, Sec.Group.getPointer()->getName());
if (Sec.isComdat())
OS << ",comdat";
}
if (Sec.isUnique())
OS << ",unique," << Sec.UniqueID;
OS << '\n';
if (Subsection) {
OS << "\t.subsection\t" << Subsection;
OS << '\n';
}
}
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