10b57cec5SDimitry Andric //===- lib/MC/MCSectionWasm.cpp - Wasm Code Section Representation --------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric 90b57cec5SDimitry Andric #include "llvm/MC/MCSectionWasm.h" 100b57cec5SDimitry Andric #include "llvm/MC/MCAsmInfo.h" 110b57cec5SDimitry Andric #include "llvm/MC/MCExpr.h" 125ffd83dbSDimitry Andric #include "llvm/MC/MCSymbolWasm.h" 130b57cec5SDimitry Andric #include "llvm/Support/raw_ostream.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric using namespace llvm; 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric // Decides whether a '.section' directive 180b57cec5SDimitry Andric // should be printed before the section name. 190b57cec5SDimitry Andric bool MCSectionWasm::shouldOmitSectionDirective(StringRef Name, 200b57cec5SDimitry Andric const MCAsmInfo &MAI) const { 210b57cec5SDimitry Andric return MAI.shouldOmitSectionDirective(Name); 220b57cec5SDimitry Andric } 230b57cec5SDimitry Andric 240b57cec5SDimitry Andric static void printName(raw_ostream &OS, StringRef Name) { 250b57cec5SDimitry Andric if (Name.find_first_not_of("0123456789_." 260b57cec5SDimitry Andric "abcdefghijklmnopqrstuvwxyz" 270b57cec5SDimitry Andric "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) { 280b57cec5SDimitry Andric OS << Name; 290b57cec5SDimitry Andric return; 300b57cec5SDimitry Andric } 310b57cec5SDimitry Andric OS << '"'; 320b57cec5SDimitry Andric for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) { 330b57cec5SDimitry Andric if (*B == '"') // Unquoted " 340b57cec5SDimitry Andric OS << "\\\""; 350b57cec5SDimitry Andric else if (*B != '\\') // Neither " or backslash 360b57cec5SDimitry Andric OS << *B; 370b57cec5SDimitry Andric else if (B + 1 == E) // Trailing backslash 380b57cec5SDimitry Andric OS << "\\\\"; 390b57cec5SDimitry Andric else { 400b57cec5SDimitry Andric OS << B[0] << B[1]; // Quoted character 410b57cec5SDimitry Andric ++B; 420b57cec5SDimitry Andric } 430b57cec5SDimitry Andric } 440b57cec5SDimitry Andric OS << '"'; 450b57cec5SDimitry Andric } 460b57cec5SDimitry Andric 4781ad6265SDimitry Andric void MCSectionWasm::printSwitchToSection(const MCAsmInfo &MAI, const Triple &T, 480b57cec5SDimitry Andric raw_ostream &OS, 49*0fca6ea1SDimitry Andric uint32_t Subsection) const { 500b57cec5SDimitry Andric 515ffd83dbSDimitry Andric if (shouldOmitSectionDirective(getName(), MAI)) { 525ffd83dbSDimitry Andric OS << '\t' << getName(); 53*0fca6ea1SDimitry Andric if (Subsection) 54*0fca6ea1SDimitry Andric OS << '\t' << Subsection; 550b57cec5SDimitry Andric OS << '\n'; 560b57cec5SDimitry Andric return; 570b57cec5SDimitry Andric } 580b57cec5SDimitry Andric 590b57cec5SDimitry Andric OS << "\t.section\t"; 605ffd83dbSDimitry Andric printName(OS, getName()); 610b57cec5SDimitry Andric OS << ",\""; 620b57cec5SDimitry Andric 630b57cec5SDimitry Andric if (IsPassive) 64fe6060f1SDimitry Andric OS << 'p'; 65e8d8bef9SDimitry Andric if (Group) 66fe6060f1SDimitry Andric OS << 'G'; 67fe6060f1SDimitry Andric if (SegmentFlags & wasm::WASM_SEG_FLAG_STRINGS) 68fe6060f1SDimitry Andric OS << 'S'; 69fe6060f1SDimitry Andric if (SegmentFlags & wasm::WASM_SEG_FLAG_TLS) 70fe6060f1SDimitry Andric OS << 'T'; 71*0fca6ea1SDimitry Andric if (SegmentFlags & wasm::WASM_SEG_FLAG_RETAIN) 72*0fca6ea1SDimitry Andric OS << 'R'; 730b57cec5SDimitry Andric 740b57cec5SDimitry Andric OS << '"'; 750b57cec5SDimitry Andric 760b57cec5SDimitry Andric OS << ','; 770b57cec5SDimitry Andric 780b57cec5SDimitry Andric // If comment string is '@', e.g. as on ARM - use '%' instead 790b57cec5SDimitry Andric if (MAI.getCommentString()[0] == '@') 800b57cec5SDimitry Andric OS << '%'; 810b57cec5SDimitry Andric else 820b57cec5SDimitry Andric OS << '@'; 830b57cec5SDimitry Andric 840b57cec5SDimitry Andric // TODO: Print section type. 850b57cec5SDimitry Andric 86e8d8bef9SDimitry Andric if (Group) { 87e8d8bef9SDimitry Andric OS << ","; 88e8d8bef9SDimitry Andric printName(OS, Group->getName()); 89e8d8bef9SDimitry Andric OS << ",comdat"; 90e8d8bef9SDimitry Andric } 91e8d8bef9SDimitry Andric 920b57cec5SDimitry Andric if (isUnique()) 930b57cec5SDimitry Andric OS << ",unique," << UniqueID; 940b57cec5SDimitry Andric 950b57cec5SDimitry Andric OS << '\n'; 960b57cec5SDimitry Andric 97*0fca6ea1SDimitry Andric if (Subsection) 98*0fca6ea1SDimitry Andric OS << "\t.subsection\t" << Subsection << '\n'; 990b57cec5SDimitry Andric } 1000b57cec5SDimitry Andric 10181ad6265SDimitry Andric bool MCSectionWasm::useCodeAlign() const { return false; } 102