| //===- MCExpr.cpp - Assembly Level Expression Implementation --------------===// | |
| // | |
| // 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 | |
| // | |
| //===----------------------------------------------------------------------===// | |
| #include "llvm/MC/MCExpr.h" | |
| #include "llvm/ADT/Statistic.h" | |
| #include "llvm/ADT/StringSwitch.h" | |
| #include "llvm/Config/llvm-config.h" | |
| #include "llvm/MC/MCAsmBackend.h" | |
| #include "llvm/MC/MCAsmInfo.h" | |
| #include "llvm/MC/MCAsmLayout.h" | |
| #include "llvm/MC/MCAssembler.h" | |
| #include "llvm/MC/MCContext.h" | |
| #include "llvm/MC/MCObjectWriter.h" | |
| #include "llvm/MC/MCSymbol.h" | |
| #include "llvm/MC/MCValue.h" | |
| #include "llvm/Support/Casting.h" | |
| #include "llvm/Support/Compiler.h" | |
| #include "llvm/Support/Debug.h" | |
| #include "llvm/Support/ErrorHandling.h" | |
| #include "llvm/Support/raw_ostream.h" | |
| #include <cassert> | |
| #include <cstdint> | |
| using namespace llvm; | |
| #define DEBUG_TYPE "mcexpr" | |
| namespace { | |
| namespace stats { | |
| STATISTIC(MCExprEvaluate, "Number of MCExpr evaluations"); | |
| } // end namespace stats | |
| } // end anonymous namespace | |
| void MCExpr::print(raw_ostream &OS, const MCAsmInfo *MAI, bool InParens) const { | |
| switch (getKind()) { | |
| case MCExpr::Target: | |
| return cast<MCTargetExpr>(this)->printImpl(OS, MAI); | |
| case MCExpr::Constant: { | |
| auto Value = cast<MCConstantExpr>(*this).getValue(); | |
| auto PrintInHex = cast<MCConstantExpr>(*this).useHexFormat(); | |
| auto SizeInBytes = cast<MCConstantExpr>(*this).getSizeInBytes(); | |
| if (Value < 0 && MAI && !MAI->supportsSignedData()) | |
| PrintInHex = true; | |
| if (PrintInHex) | |
| switch (SizeInBytes) { | |
| default: | |
| OS << "0x" << Twine::utohexstr(Value); | |
| break; | |
| case 1: | |
| OS << format("0x%02" PRIx64, Value); | |
| break; | |
| case 2: | |
| OS << format("0x%04" PRIx64, Value); | |
| break; | |
| case 4: | |
| OS << format("0x%08" PRIx64, Value); | |
| break; | |
| case 8: | |
| OS << format("0x%016" PRIx64, Value); | |
| break; | |
| } | |
| else | |
| OS << Value; | |
| return; | |
| } | |
| case MCExpr::SymbolRef: { | |
| const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(*this); | |
| const MCSymbol &Sym = SRE.getSymbol(); | |
| // Parenthesize names that start with $ so that they don't look like | |
| // absolute names. | |
| bool UseParens = MAI && MAI->useParensForDollarSignNames() && !InParens && | |
| !Sym.getName().empty() && Sym.getName()[0] == '$'; | |
| if (UseParens) { | |
| OS << '('; | |
| Sym.print(OS, MAI); | |
| OS << ')'; | |
| } else | |
| Sym.print(OS, MAI); | |
| const MCSymbolRefExpr::VariantKind Kind = SRE.getKind(); | |
| if (Kind != MCSymbolRefExpr::VK_None) { | |
| if (MAI && MAI->useParensForSymbolVariant()) // ARM | |
| OS << '(' << MCSymbolRefExpr::getVariantKindName(Kind) << ')'; | |
| else | |
| OS << '@' << MCSymbolRefExpr::getVariantKindName(Kind); | |
| } | |
| return; | |
| } | |
| case MCExpr::Unary: { | |
| const MCUnaryExpr &UE = cast<MCUnaryExpr>(*this); | |
| switch (UE.getOpcode()) { | |
| case MCUnaryExpr::LNot: OS << '!'; break; | |
| case MCUnaryExpr::Minus: OS << '-'; break; | |
| case MCUnaryExpr::Not: OS << '~'; break; | |
| case MCUnaryExpr::Plus: OS << '+'; break; | |
| } | |
| bool Binary = UE.getSubExpr()->getKind() == MCExpr::Binary; | |
| if (Binary) OS << "("; | |
| UE.getSubExpr()->print(OS, MAI); | |
| if (Binary) OS << ")"; | |
| return; | |
| } | |
| case MCExpr::Binary: { | |
| const MCBinaryExpr &BE = cast<MCBinaryExpr>(*this); | |
| // Only print parens around the LHS if it is non-trivial. | |
| if (isa<MCConstantExpr>(BE.getLHS()) || isa<MCSymbolRefExpr>(BE.getLHS())) { | |
| BE.getLHS()->print(OS, MAI); | |
| } else { | |
| OS << '('; | |
| BE.getLHS()->print(OS, MAI); | |
| OS << ')'; | |
| } | |
| switch (BE.getOpcode()) { | |
| case MCBinaryExpr::Add: | |
| // Print "X-42" instead of "X+-42". | |
| if (const MCConstantExpr *RHSC = dyn_cast<MCConstantExpr>(BE.getRHS())) { | |
| if (RHSC->getValue() < 0) { | |
| OS << RHSC->getValue(); | |
| return; | |
| } | |
| } | |
| OS << '+'; | |
| break; | |
| case MCBinaryExpr::AShr: OS << ">>"; break; | |
| case MCBinaryExpr::And: OS << '&'; break; | |
| case MCBinaryExpr::Div: OS << '/'; break; | |
| case MCBinaryExpr::EQ: OS << "=="; break; | |
| case MCBinaryExpr::GT: OS << '>'; break; | |
| case MCBinaryExpr::GTE: OS << ">="; break; | |
| case MCBinaryExpr::LAnd: OS << "&&"; break; | |
| case MCBinaryExpr::LOr: OS << "||"; break; | |
| case MCBinaryExpr::LShr: OS << ">>"; break; | |
| case MCBinaryExpr::LT: OS << '<'; break; | |
| case MCBinaryExpr::LTE: OS << "<="; break; | |
| case MCBinaryExpr::Mod: OS << '%'; break; | |
| case MCBinaryExpr::Mul: OS << '*'; break; | |
| case MCBinaryExpr::NE: OS << "!="; break; | |
| case MCBinaryExpr::Or: OS << '|'; break; | |
| case MCBinaryExpr::OrNot: OS << '!'; break; | |
| case MCBinaryExpr::Shl: OS << "<<"; break; | |
| case MCBinaryExpr::Sub: OS << '-'; break; | |
| case MCBinaryExpr::Xor: OS << '^'; break; | |
| } | |
| // Only print parens around the LHS if it is non-trivial. | |
| if (isa<MCConstantExpr>(BE.getRHS()) || isa<MCSymbolRefExpr>(BE.getRHS())) { | |
| BE.getRHS()->print(OS, MAI); | |
| } else { | |
| OS << '('; | |
| BE.getRHS()->print(OS, MAI); | |
| OS << ')'; | |
| } | |
| return; | |
| } | |
| } | |
| llvm_unreachable("Invalid expression kind!"); | |
| } | |
| #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) | |
| LLVM_DUMP_METHOD void MCExpr::dump() const { | |
| dbgs() << *this; | |
| dbgs() << '\n'; | |
| } | |
| #endif | |
| /* *** */ | |
| const MCBinaryExpr *MCBinaryExpr::create(Opcode Opc, const MCExpr *LHS, | |
| const MCExpr *RHS, MCContext &Ctx, | |
| SMLoc Loc) { | |
| return new (Ctx) MCBinaryExpr(Opc, LHS, RHS, Loc); | |
| } | |
| const MCUnaryExpr *MCUnaryExpr::create(Opcode Opc, const MCExpr *Expr, | |
| MCContext &Ctx, SMLoc Loc) { | |
| return new (Ctx) MCUnaryExpr(Opc, Expr, Loc); | |
| } | |
| const MCConstantExpr *MCConstantExpr::create(int64_t Value, MCContext &Ctx, | |
| bool PrintInHex, | |
| unsigned SizeInBytes) { | |
| return new (Ctx) MCConstantExpr(Value, PrintInHex, SizeInBytes); | |
| } | |
| /* *** */ | |
| MCSymbolRefExpr::MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind, | |
| const MCAsmInfo *MAI, SMLoc Loc) | |
| : MCExpr(MCExpr::SymbolRef, Loc, | |
| encodeSubclassData(Kind, MAI->hasSubsectionsViaSymbols())), | |
| Symbol(Symbol) { | |
| assert(Symbol); | |
| } | |
| const MCSymbolRefExpr *MCSymbolRefExpr::create(const MCSymbol *Sym, | |
| VariantKind Kind, | |
| MCContext &Ctx, SMLoc Loc) { | |
| return new (Ctx) MCSymbolRefExpr(Sym, Kind, Ctx.getAsmInfo(), Loc); | |
| } | |
| const MCSymbolRefExpr *MCSymbolRefExpr::create(StringRef Name, VariantKind Kind, | |
| MCContext &Ctx) { | |
| return create(Ctx.getOrCreateSymbol(Name), Kind, Ctx); | |
| } | |
| StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) { | |
| switch (Kind) { | |
| case VK_Invalid: return "<<invalid>>"; | |
| case VK_None: return "<<none>>"; | |
| case VK_DTPOFF: return "DTPOFF"; | |
| case VK_DTPREL: return "DTPREL"; | |
| case VK_GOT: return "GOT"; | |
| case VK_GOTOFF: return "GOTOFF"; | |
| case VK_GOTREL: return "GOTREL"; | |
| case VK_PCREL: return "PCREL"; | |
| case VK_GOTPCREL: return "GOTPCREL"; | |
| case VK_GOTPCREL_NORELAX: return "GOTPCREL_NORELAX"; | |
| case VK_GOTTPOFF: return "GOTTPOFF"; | |
| case VK_INDNTPOFF: return "INDNTPOFF"; | |
| case VK_NTPOFF: return "NTPOFF"; | |
| case VK_GOTNTPOFF: return "GOTNTPOFF"; | |
| case VK_PLT: return "PLT"; | |
| case VK_TLSGD: return "TLSGD"; | |
| case VK_TLSLD: return "TLSLD"; | |
| case VK_TLSLDM: return "TLSLDM"; | |
| case VK_TPOFF: return "TPOFF"; | |
| case VK_TPREL: return "TPREL"; | |
| case VK_TLSCALL: return "tlscall"; | |
| case VK_TLSDESC: return "tlsdesc"; | |
| case VK_TLVP: return "TLVP"; | |
| case VK_TLVPPAGE: return "TLVPPAGE"; | |
| case VK_TLVPPAGEOFF: return "TLVPPAGEOFF"; | |
| case VK_PAGE: return "PAGE"; | |
| case VK_PAGEOFF: return "PAGEOFF"; | |
| case VK_GOTPAGE: return "GOTPAGE"; | |
| case VK_GOTPAGEOFF: return "GOTPAGEOFF"; | |
| case VK_SECREL: return "SECREL32"; | |
| case VK_SIZE: return "SIZE"; | |
| case VK_WEAKREF: return "WEAKREF"; | |
| case VK_X86_ABS8: return "ABS8"; | |
| case VK_X86_PLTOFF: return "PLTOFF"; | |
| case VK_ARM_NONE: return "none"; | |
| case VK_ARM_GOT_PREL: return "GOT_PREL"; | |
| case VK_ARM_TARGET1: return "target1"; | |
| case VK_ARM_TARGET2: return "target2"; | |
| case VK_ARM_PREL31: return "prel31"; | |
| case VK_ARM_SBREL: return "sbrel"; | |
| case VK_ARM_TLSLDO: return "tlsldo"; | |
| case VK_ARM_TLSDESCSEQ: return "tlsdescseq"; | |
| case VK_AVR_NONE: return "none"; | |
| case VK_AVR_LO8: return "lo8"; | |
| case VK_AVR_HI8: return "hi8"; | |
| case VK_AVR_HLO8: return "hlo8"; | |
| case VK_AVR_DIFF8: return "diff8"; | |
| case VK_AVR_DIFF16: return "diff16"; | |
| case VK_AVR_DIFF32: return "diff32"; | |
| case VK_AVR_PM: return "pm"; | |
| case VK_PPC_LO: return "l"; | |
| case VK_PPC_HI: return "h"; | |
| case VK_PPC_HA: return "ha"; | |
| case VK_PPC_HIGH: return "high"; | |
| case VK_PPC_HIGHA: return "higha"; | |
| case VK_PPC_HIGHER: return "higher"; | |
| case VK_PPC_HIGHERA: return "highera"; | |
| case VK_PPC_HIGHEST: return "highest"; | |
| case VK_PPC_HIGHESTA: return "highesta"; | |
| case VK_PPC_GOT_LO: return "got@l"; | |
| case VK_PPC_GOT_HI: return "got@h"; | |
| case VK_PPC_GOT_HA: return "got@ha"; | |
| case VK_PPC_TOCBASE: return "tocbase"; | |
| case VK_PPC_TOC: return "toc"; | |
| case VK_PPC_TOC_LO: return "toc@l"; | |
| case VK_PPC_TOC_HI: return "toc@h"; | |
| case VK_PPC_TOC_HA: return "toc@ha"; | |
| case VK_PPC_U: return "u"; | |
| case VK_PPC_L: return "l"; | |
| case VK_PPC_DTPMOD: return "dtpmod"; | |
| case VK_PPC_TPREL_LO: return "tprel@l"; | |
| case VK_PPC_TPREL_HI: return "tprel@h"; | |
| case VK_PPC_TPREL_HA: return "tprel@ha"; | |
| case VK_PPC_TPREL_HIGH: return "tprel@high"; | |
| case VK_PPC_TPREL_HIGHA: return "tprel@higha"; | |
| case VK_PPC_TPREL_HIGHER: return "tprel@higher"; | |
| case VK_PPC_TPREL_HIGHERA: return "tprel@highera"; | |
| case VK_PPC_TPREL_HIGHEST: return "tprel@highest"; | |
| case VK_PPC_TPREL_HIGHESTA: return "tprel@highesta"; | |
| case VK_PPC_DTPREL_LO: return "dtprel@l"; | |
| case VK_PPC_DTPREL_HI: return "dtprel@h"; | |
| case VK_PPC_DTPREL_HA: return "dtprel@ha"; | |
| case VK_PPC_DTPREL_HIGH: return "dtprel@high"; | |
| case VK_PPC_DTPREL_HIGHA: return "dtprel@higha"; | |
| case VK_PPC_DTPREL_HIGHER: return "dtprel@higher"; | |
| case VK_PPC_DTPREL_HIGHERA: return "dtprel@highera"; | |
| case VK_PPC_DTPREL_HIGHEST: return "dtprel@highest"; | |
| case VK_PPC_DTPREL_HIGHESTA: return "dtprel@highesta"; | |
| case VK_PPC_GOT_TPREL: return "got@tprel"; | |
| case VK_PPC_GOT_TPREL_LO: return "got@tprel@l"; | |
| case VK_PPC_GOT_TPREL_HI: return "got@tprel@h"; | |
| case VK_PPC_GOT_TPREL_HA: return "got@tprel@ha"; | |
| case VK_PPC_GOT_DTPREL: return "got@dtprel"; | |
| case VK_PPC_GOT_DTPREL_LO: return "got@dtprel@l"; | |
| case VK_PPC_GOT_DTPREL_HI: return "got@dtprel@h"; | |
| case VK_PPC_GOT_DTPREL_HA: return "got@dtprel@ha"; | |
| case VK_PPC_TLS: return "tls"; | |
| case VK_PPC_GOT_TLSGD: return "got@tlsgd"; | |
| case VK_PPC_GOT_TLSGD_LO: return "got@tlsgd@l"; | |
| case VK_PPC_GOT_TLSGD_HI: return "got@tlsgd@h"; | |
| case VK_PPC_GOT_TLSGD_HA: return "got@tlsgd@ha"; | |
| case VK_PPC_TLSGD: return "tlsgd"; | |
| case VK_PPC_AIX_TLSGD: | |
| return "gd"; | |
| case VK_PPC_AIX_TLSGDM: | |
| return "m"; | |
| case VK_PPC_GOT_TLSLD: return "got@tlsld"; | |
| case VK_PPC_GOT_TLSLD_LO: return "got@tlsld@l"; | |
| case VK_PPC_GOT_TLSLD_HI: return "got@tlsld@h"; | |
| case VK_PPC_GOT_TLSLD_HA: return "got@tlsld@ha"; | |
| case VK_PPC_GOT_PCREL: | |
| return "got@pcrel"; | |
| case VK_PPC_GOT_TLSGD_PCREL: | |
| return "got@tlsgd@pcrel"; | |
| case VK_PPC_GOT_TLSLD_PCREL: | |
| return "got@tlsld@pcrel"; | |
| case VK_PPC_GOT_TPREL_PCREL: | |
| return "got@tprel@pcrel"; | |
| case VK_PPC_TLS_PCREL: | |
| return "tls@pcrel"; | |
| case VK_PPC_TLSLD: return "tlsld"; | |
| case VK_PPC_LOCAL: return "local"; | |
| case VK_PPC_NOTOC: return "notoc"; | |
| case VK_PPC_PCREL_OPT: return "<<invalid>>"; | |
| case VK_COFF_IMGREL32: return "IMGREL"; | |
| case VK_Hexagon_LO16: return "LO16"; | |
| case VK_Hexagon_HI16: return "HI16"; | |
| case VK_Hexagon_GPREL: return "GPREL"; | |
| case VK_Hexagon_GD_GOT: return "GDGOT"; | |
| case VK_Hexagon_LD_GOT: return "LDGOT"; | |
| case VK_Hexagon_GD_PLT: return "GDPLT"; | |
| case VK_Hexagon_LD_PLT: return "LDPLT"; | |
| case VK_Hexagon_IE: return "IE"; | |
| case VK_Hexagon_IE_GOT: return "IEGOT"; | |
| case VK_WASM_TYPEINDEX: return "TYPEINDEX"; | |
| case VK_WASM_MBREL: return "MBREL"; | |
| case VK_WASM_TLSREL: return "TLSREL"; | |
| case VK_WASM_TBREL: return "TBREL"; | |
| case VK_WASM_GOT_TLS: return "GOT@TLS"; | |
| case VK_AMDGPU_GOTPCREL32_LO: return "gotpcrel32@lo"; | |
| case VK_AMDGPU_GOTPCREL32_HI: return "gotpcrel32@hi"; | |
| case VK_AMDGPU_REL32_LO: return "rel32@lo"; | |
| case VK_AMDGPU_REL32_HI: return "rel32@hi"; | |
| case VK_AMDGPU_REL64: return "rel64"; | |
| case VK_AMDGPU_ABS32_LO: return "abs32@lo"; | |
| case VK_AMDGPU_ABS32_HI: return "abs32@hi"; | |
| case VK_VE_HI32: return "hi"; | |
| case VK_VE_LO32: return "lo"; | |
| case VK_VE_PC_HI32: return "pc_hi"; | |
| case VK_VE_PC_LO32: return "pc_lo"; | |
| case VK_VE_GOT_HI32: return "got_hi"; | |
| case VK_VE_GOT_LO32: return "got_lo"; | |
| case VK_VE_GOTOFF_HI32: return "gotoff_hi"; | |
| case VK_VE_GOTOFF_LO32: return "gotoff_lo"; | |
| case VK_VE_PLT_HI32: return "plt_hi"; | |
| case VK_VE_PLT_LO32: return "plt_lo"; | |
| case VK_VE_TLS_GD_HI32: return "tls_gd_hi"; | |
| case VK_VE_TLS_GD_LO32: return "tls_gd_lo"; | |
| case VK_VE_TPOFF_HI32: return "tpoff_hi"; | |
| case VK_VE_TPOFF_LO32: return "tpoff_lo"; | |
| } | |
| llvm_unreachable("Invalid variant kind"); | |
| } | |
| MCSymbolRefExpr::VariantKind | |
| MCSymbolRefExpr::getVariantKindForName(StringRef Name) { | |
| return StringSwitch<VariantKind>(Name.lower()) | |
| .Case("dtprel", VK_DTPREL) | |
| .Case("dtpoff", VK_DTPOFF) | |
| .Case("got", VK_GOT) | |
| .Case("gotoff", VK_GOTOFF) | |
| .Case("gotrel", VK_GOTREL) | |
| .Case("pcrel", VK_PCREL) | |
| .Case("gotpcrel", VK_GOTPCREL) | |
| .Case("gotpcrel_norelax", VK_GOTPCREL_NORELAX) | |
| .Case("gottpoff", VK_GOTTPOFF) | |
| .Case("indntpoff", VK_INDNTPOFF) | |
| .Case("ntpoff", VK_NTPOFF) | |
| .Case("gotntpoff", VK_GOTNTPOFF) | |
| .Case("plt", VK_PLT) | |
| .Case("tlscall", VK_TLSCALL) | |
| .Case("tlsdesc", VK_TLSDESC) | |
| .Case("tlsgd", VK_TLSGD) | |
| .Case("tlsld", VK_TLSLD) | |
| .Case("tlsldm", VK_TLSLDM) | |
| .Case("tpoff", VK_TPOFF) | |
| .Case("tprel", VK_TPREL) | |
| .Case("tlvp", VK_TLVP) | |
| .Case("tlvppage", VK_TLVPPAGE) | |
| .Case("tlvppageoff", VK_TLVPPAGEOFF) | |
| .Case("page", VK_PAGE) | |
| .Case("pageoff", VK_PAGEOFF) | |
| .Case("gotpage", VK_GOTPAGE) | |
| .Case("gotpageoff", VK_GOTPAGEOFF) | |
| .Case("imgrel", VK_COFF_IMGREL32) | |
| .Case("secrel32", VK_SECREL) | |
| .Case("size", VK_SIZE) | |
| .Case("abs8", VK_X86_ABS8) | |
| .Case("pltoff", VK_X86_PLTOFF) | |
| .Case("l", VK_PPC_LO) | |
| .Case("h", VK_PPC_HI) | |
| .Case("ha", VK_PPC_HA) | |
| .Case("high", VK_PPC_HIGH) | |
| .Case("higha", VK_PPC_HIGHA) | |
| .Case("higher", VK_PPC_HIGHER) | |
| .Case("highera", VK_PPC_HIGHERA) | |
| .Case("highest", VK_PPC_HIGHEST) | |
| .Case("highesta", VK_PPC_HIGHESTA) | |
| .Case("got@l", VK_PPC_GOT_LO) | |
| .Case("got@h", VK_PPC_GOT_HI) | |
| .Case("got@ha", VK_PPC_GOT_HA) | |
| .Case("local", VK_PPC_LOCAL) | |
| .Case("tocbase", VK_PPC_TOCBASE) | |
| .Case("toc", VK_PPC_TOC) | |
| .Case("toc@l", VK_PPC_TOC_LO) | |
| .Case("toc@h", VK_PPC_TOC_HI) | |
| .Case("toc@ha", VK_PPC_TOC_HA) | |
| .Case("u", VK_PPC_U) | |
| .Case("l", VK_PPC_L) | |
| .Case("tls", VK_PPC_TLS) | |
| .Case("dtpmod", VK_PPC_DTPMOD) | |
| .Case("tprel@l", VK_PPC_TPREL_LO) | |
| .Case("tprel@h", VK_PPC_TPREL_HI) | |
| .Case("tprel@ha", VK_PPC_TPREL_HA) | |
| .Case("tprel@high", VK_PPC_TPREL_HIGH) | |
| .Case("tprel@higha", VK_PPC_TPREL_HIGHA) | |
| .Case("tprel@higher", VK_PPC_TPREL_HIGHER) | |
| .Case("tprel@highera", VK_PPC_TPREL_HIGHERA) | |
| .Case("tprel@highest", VK_PPC_TPREL_HIGHEST) | |
| .Case("tprel@highesta", VK_PPC_TPREL_HIGHESTA) | |
| .Case("dtprel@l", VK_PPC_DTPREL_LO) | |
| .Case("dtprel@h", VK_PPC_DTPREL_HI) | |
| .Case("dtprel@ha", VK_PPC_DTPREL_HA) | |
| .Case("dtprel@high", VK_PPC_DTPREL_HIGH) | |
| .Case("dtprel@higha", VK_PPC_DTPREL_HIGHA) | |
| .Case("dtprel@higher", VK_PPC_DTPREL_HIGHER) | |
| .Case("dtprel@highera", VK_PPC_DTPREL_HIGHERA) | |
| .Case("dtprel@highest", VK_PPC_DTPREL_HIGHEST) | |
| .Case("dtprel@highesta", VK_PPC_DTPREL_HIGHESTA) | |
| .Case("got@tprel", VK_PPC_GOT_TPREL) | |
| .Case("got@tprel@l", VK_PPC_GOT_TPREL_LO) | |
| .Case("got@tprel@h", VK_PPC_GOT_TPREL_HI) | |
| .Case("got@tprel@ha", VK_PPC_GOT_TPREL_HA) | |
| .Case("got@dtprel", VK_PPC_GOT_DTPREL) | |
| .Case("got@dtprel@l", VK_PPC_GOT_DTPREL_LO) | |
| .Case("got@dtprel@h", VK_PPC_GOT_DTPREL_HI) | |
| .Case("got@dtprel@ha", VK_PPC_GOT_DTPREL_HA) | |
| .Case("got@tlsgd", VK_PPC_GOT_TLSGD) | |
| .Case("got@tlsgd@l", VK_PPC_GOT_TLSGD_LO) | |
| .Case("got@tlsgd@h", VK_PPC_GOT_TLSGD_HI) | |
| .Case("got@tlsgd@ha", VK_PPC_GOT_TLSGD_HA) | |
| .Case("got@tlsld", VK_PPC_GOT_TLSLD) | |
| .Case("got@tlsld@l", VK_PPC_GOT_TLSLD_LO) | |
| .Case("got@tlsld@h", VK_PPC_GOT_TLSLD_HI) | |
| .Case("got@tlsld@ha", VK_PPC_GOT_TLSLD_HA) | |
| .Case("got@pcrel", VK_PPC_GOT_PCREL) | |
| .Case("got@tlsgd@pcrel", VK_PPC_GOT_TLSGD_PCREL) | |
| .Case("got@tlsld@pcrel", VK_PPC_GOT_TLSLD_PCREL) | |
| .Case("got@tprel@pcrel", VK_PPC_GOT_TPREL_PCREL) | |
| .Case("tls@pcrel", VK_PPC_TLS_PCREL) | |
| .Case("notoc", VK_PPC_NOTOC) | |
| .Case("gdgot", VK_Hexagon_GD_GOT) | |
| .Case("gdplt", VK_Hexagon_GD_PLT) | |
| .Case("iegot", VK_Hexagon_IE_GOT) | |
| .Case("ie", VK_Hexagon_IE) | |
| .Case("ldgot", VK_Hexagon_LD_GOT) | |
| .Case("ldplt", VK_Hexagon_LD_PLT) | |
| .Case("none", VK_ARM_NONE) | |
| .Case("got_prel", VK_ARM_GOT_PREL) | |
| .Case("target1", VK_ARM_TARGET1) | |
| .Case("target2", VK_ARM_TARGET2) | |
| .Case("prel31", VK_ARM_PREL31) | |
| .Case("sbrel", VK_ARM_SBREL) | |
| .Case("tlsldo", VK_ARM_TLSLDO) | |
| .Case("lo8", VK_AVR_LO8) | |
| .Case("hi8", VK_AVR_HI8) | |
| .Case("hlo8", VK_AVR_HLO8) | |
| .Case("typeindex", VK_WASM_TYPEINDEX) | |
| .Case("tbrel", VK_WASM_TBREL) | |
| .Case("mbrel", VK_WASM_MBREL) | |
| .Case("tlsrel", VK_WASM_TLSREL) | |
| .Case("got@tls", VK_WASM_GOT_TLS) | |
| .Case("gotpcrel32@lo", VK_AMDGPU_GOTPCREL32_LO) | |
| .Case("gotpcrel32@hi", VK_AMDGPU_GOTPCREL32_HI) | |
| .Case("rel32@lo", VK_AMDGPU_REL32_LO) | |
| .Case("rel32@hi", VK_AMDGPU_REL32_HI) | |
| .Case("rel64", VK_AMDGPU_REL64) | |
| .Case("abs32@lo", VK_AMDGPU_ABS32_LO) | |
| .Case("abs32@hi", VK_AMDGPU_ABS32_HI) | |
| .Case("hi", VK_VE_HI32) | |
| .Case("lo", VK_VE_LO32) | |
| .Case("pc_hi", VK_VE_PC_HI32) | |
| .Case("pc_lo", VK_VE_PC_LO32) | |
| .Case("got_hi", VK_VE_GOT_HI32) | |
| .Case("got_lo", VK_VE_GOT_LO32) | |
| .Case("gotoff_hi", VK_VE_GOTOFF_HI32) | |
| .Case("gotoff_lo", VK_VE_GOTOFF_LO32) | |
| .Case("plt_hi", VK_VE_PLT_HI32) | |
| .Case("plt_lo", VK_VE_PLT_LO32) | |
| .Case("tls_gd_hi", VK_VE_TLS_GD_HI32) | |
| .Case("tls_gd_lo", VK_VE_TLS_GD_LO32) | |
| .Case("tpoff_hi", VK_VE_TPOFF_HI32) | |
| .Case("tpoff_lo", VK_VE_TPOFF_LO32) | |
| .Default(VK_Invalid); | |
| } | |
| /* *** */ | |
| void MCTargetExpr::anchor() {} | |
| /* *** */ | |
| bool MCExpr::evaluateAsAbsolute(int64_t &Res) const { | |
| return evaluateAsAbsolute(Res, nullptr, nullptr, nullptr, false); | |
| } | |
| bool MCExpr::evaluateAsAbsolute(int64_t &Res, | |
| const MCAsmLayout &Layout) const { | |
| return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr, false); | |
| } | |
| bool MCExpr::evaluateAsAbsolute(int64_t &Res, | |
| const MCAsmLayout &Layout, | |
| const SectionAddrMap &Addrs) const { | |
| // Setting InSet causes us to absolutize differences across sections and that | |
| // is what the MachO writer uses Addrs for. | |
| return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, &Addrs, true); | |
| } | |
| bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const { | |
| return evaluateAsAbsolute(Res, &Asm, nullptr, nullptr, false); | |
| } | |
| bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm) const { | |
| return evaluateAsAbsolute(Res, Asm, nullptr, nullptr, false); | |
| } | |
| bool MCExpr::evaluateKnownAbsolute(int64_t &Res, | |
| const MCAsmLayout &Layout) const { | |
| return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr, | |
| true); | |
| } | |
| bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm, | |
| const MCAsmLayout *Layout, | |
| const SectionAddrMap *Addrs, bool InSet) const { | |
| MCValue Value; | |
| // Fast path constants. | |
| if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(this)) { | |
| Res = CE->getValue(); | |
| return true; | |
| } | |
| bool IsRelocatable = | |
| evaluateAsRelocatableImpl(Value, Asm, Layout, nullptr, Addrs, InSet); | |
| // Record the current value. | |
| Res = Value.getConstant(); | |
| return IsRelocatable && Value.isAbsolute(); | |
| } | |
| /// Helper method for \see EvaluateSymbolAdd(). | |
| static void AttemptToFoldSymbolOffsetDifference( | |
| const MCAssembler *Asm, const MCAsmLayout *Layout, | |
| const SectionAddrMap *Addrs, bool InSet, const MCSymbolRefExpr *&A, | |
| const MCSymbolRefExpr *&B, int64_t &Addend) { | |
| if (!A || !B) | |
| return; | |
| const MCSymbol &SA = A->getSymbol(); | |
| const MCSymbol &SB = B->getSymbol(); | |
| if (SA.isUndefined() || SB.isUndefined()) | |
| return; | |
| if (!Asm->getWriter().isSymbolRefDifferenceFullyResolved(*Asm, A, B, InSet)) | |
| return; | |
| auto FinalizeFolding = [&]() { | |
| // Pointers to Thumb symbols need to have their low-bit set to allow | |
| // for interworking. | |
| if (Asm->isThumbFunc(&SA)) | |
| Addend |= 1; | |
| // If symbol is labeled as micromips, we set low-bit to ensure | |
| // correct offset in .gcc_except_table | |
| if (Asm->getBackend().isMicroMips(&SA)) | |
| Addend |= 1; | |
| // Clear the symbol expr pointers to indicate we have folded these | |
| // operands. | |
| A = B = nullptr; | |
| }; | |
| const MCFragment *FA = SA.getFragment(); | |
| const MCFragment *FB = SB.getFragment(); | |
| // If both symbols are in the same fragment, return the difference of their | |
| // offsets | |
| if (FA == FB && !SA.isVariable() && !SA.isUnset() && !SB.isVariable() && | |
| !SB.isUnset()) { | |
| Addend += SA.getOffset() - SB.getOffset(); | |
| return FinalizeFolding(); | |
| } | |
| const MCSection &SecA = *FA->getParent(); | |
| const MCSection &SecB = *FB->getParent(); | |
| if ((&SecA != &SecB) && !Addrs) | |
| return; | |
| if (Layout) { | |
| // One of the symbol involved is part of a fragment being laid out. Quit now | |
| // to avoid a self loop. | |
| if (!Layout->canGetFragmentOffset(FA) || !Layout->canGetFragmentOffset(FB)) | |
| return; | |
| // Eagerly evaluate when layout is finalized. | |
| Addend += Layout->getSymbolOffset(A->getSymbol()) - | |
| Layout->getSymbolOffset(B->getSymbol()); | |
| if (Addrs && (&SecA != &SecB)) | |
| Addend += (Addrs->lookup(&SecA) - Addrs->lookup(&SecB)); | |
| FinalizeFolding(); | |
| } else { | |
| // When layout is not finalized, our ability to resolve differences between | |
| // symbols is limited to specific cases where the fragments between two | |
| // symbols (including the fragments the symbols are defined in) are | |
| // fixed-size fragments so the difference can be calculated. For example, | |
| // this is important when the Subtarget is changed and a new MCDataFragment | |
| // is created in the case of foo: instr; .arch_extension ext; instr .if . - | |
| // foo. | |
| if (SA.isVariable() || SA.isUnset() || SB.isVariable() || SB.isUnset() || | |
| FA->getKind() != MCFragment::FT_Data || | |
| FB->getKind() != MCFragment::FT_Data || | |
| FA->getSubsectionNumber() != FB->getSubsectionNumber()) | |
| return; | |
| // Try to find a constant displacement from FA to FB, add the displacement | |
| // between the offset in FA of SA and the offset in FB of SB. | |
| int64_t Displacement = SA.getOffset() - SB.getOffset(); | |
| for (auto FI = FB->getIterator(), FE = SecA.end(); FI != FE; ++FI) { | |
| if (&*FI == FA) { | |
| Addend += Displacement; | |
| return FinalizeFolding(); | |
| } | |
| if (FI->getKind() != MCFragment::FT_Data) | |
| return; | |
| Displacement += cast<MCDataFragment>(FI)->getContents().size(); | |
| } | |
| } | |
| } | |
| /// Evaluate the result of an add between (conceptually) two MCValues. | |
| /// | |
| /// This routine conceptually attempts to construct an MCValue: | |
| /// Result = (Result_A - Result_B + Result_Cst) | |
| /// from two MCValue's LHS and RHS where | |
| /// Result = LHS + RHS | |
| /// and | |
| /// Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst). | |
| /// | |
| /// This routine attempts to aggressively fold the operands such that the result | |
| /// is representable in an MCValue, but may not always succeed. | |
| /// | |
| /// \returns True on success, false if the result is not representable in an | |
| /// MCValue. | |
| /// NOTE: It is really important to have both the Asm and Layout arguments. | |
| /// They might look redundant, but this function can be used before layout | |
| /// is done (see the object streamer for example) and having the Asm argument | |
| /// lets us avoid relaxations early. | |
| static bool | |
| EvaluateSymbolicAdd(const MCAssembler *Asm, const MCAsmLayout *Layout, | |
| const SectionAddrMap *Addrs, bool InSet, const MCValue &LHS, | |
| const MCSymbolRefExpr *RHS_A, const MCSymbolRefExpr *RHS_B, | |
| int64_t RHS_Cst, MCValue &Res) { | |
| // FIXME: This routine (and other evaluation parts) are *incredibly* sloppy | |
| // about dealing with modifiers. This will ultimately bite us, one day. | |
| const MCSymbolRefExpr *LHS_A = LHS.getSymA(); | |
| const MCSymbolRefExpr *LHS_B = LHS.getSymB(); | |
| int64_t LHS_Cst = LHS.getConstant(); | |
| // Fold the result constant immediately. | |
| int64_t Result_Cst = LHS_Cst + RHS_Cst; | |
| assert((!Layout || Asm) && | |
| "Must have an assembler object if layout is given!"); | |
| // If we have a layout, we can fold resolved differences. | |
| if (Asm) { | |
| // First, fold out any differences which are fully resolved. By | |
| // reassociating terms in | |
| // Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst). | |
| // we have the four possible differences: | |
| // (LHS_A - LHS_B), | |
| // (LHS_A - RHS_B), | |
| // (RHS_A - LHS_B), | |
| // (RHS_A - RHS_B). | |
| // Since we are attempting to be as aggressive as possible about folding, we | |
| // attempt to evaluate each possible alternative. | |
| AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, LHS_B, | |
| Result_Cst); | |
| AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, RHS_B, | |
| Result_Cst); | |
| AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, LHS_B, | |
| Result_Cst); | |
| AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, RHS_B, | |
| Result_Cst); | |
| } | |
| // We can't represent the addition or subtraction of two symbols. | |
| if ((LHS_A && RHS_A) || (LHS_B && RHS_B)) | |
| return false; | |
| // At this point, we have at most one additive symbol and one subtractive | |
| // symbol -- find them. | |
| const MCSymbolRefExpr *A = LHS_A ? LHS_A : RHS_A; | |
| const MCSymbolRefExpr *B = LHS_B ? LHS_B : RHS_B; | |
| Res = MCValue::get(A, B, Result_Cst); | |
| return true; | |
| } | |
| bool MCExpr::evaluateAsRelocatable(MCValue &Res, | |
| const MCAsmLayout *Layout, | |
| const MCFixup *Fixup) const { | |
| MCAssembler *Assembler = Layout ? &Layout->getAssembler() : nullptr; | |
| return evaluateAsRelocatableImpl(Res, Assembler, Layout, Fixup, nullptr, | |
| false); | |
| } | |
| bool MCExpr::evaluateAsValue(MCValue &Res, const MCAsmLayout &Layout) const { | |
| MCAssembler *Assembler = &Layout.getAssembler(); | |
| return evaluateAsRelocatableImpl(Res, Assembler, &Layout, nullptr, nullptr, | |
| true); | |
| } | |
| static bool canExpand(const MCSymbol &Sym, bool InSet) { | |
| const MCExpr *Expr = Sym.getVariableValue(); | |
| const auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr); | |
| if (Inner) { | |
| if (Inner->getKind() == MCSymbolRefExpr::VK_WEAKREF) | |
| return false; | |
| } | |
| if (InSet) | |
| return true; | |
| return !Sym.isInSection(); | |
| } | |
| bool MCExpr::evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm, | |
| const MCAsmLayout *Layout, | |
| const MCFixup *Fixup, | |
| const SectionAddrMap *Addrs, | |
| bool InSet) const { | |
| ++stats::MCExprEvaluate; | |
| switch (getKind()) { | |
| case Target: | |
| return cast<MCTargetExpr>(this)->evaluateAsRelocatableImpl(Res, Layout, | |
| Fixup); | |
| case Constant: | |
| Res = MCValue::get(cast<MCConstantExpr>(this)->getValue()); | |
| return true; | |
| case SymbolRef: { | |
| const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this); | |
| const MCSymbol &Sym = SRE->getSymbol(); | |
| const auto Kind = SRE->getKind(); | |
| // Evaluate recursively if this is a variable. | |
| if (Sym.isVariable() && (Kind == MCSymbolRefExpr::VK_None || Layout) && | |
| canExpand(Sym, InSet)) { | |
| bool IsMachO = SRE->hasSubsectionsViaSymbols(); | |
| if (Sym.getVariableValue()->evaluateAsRelocatableImpl( | |
| Res, Asm, Layout, Fixup, Addrs, InSet || IsMachO)) { | |
| if (Kind != MCSymbolRefExpr::VK_None) { | |
| if (Res.isAbsolute()) { | |
| Res = MCValue::get(SRE, nullptr, 0); | |
| return true; | |
| } | |
| // If the reference has a variant kind, we can only handle expressions | |
| // which evaluate exactly to a single unadorned symbol. Attach the | |
| // original VariantKind to SymA of the result. | |
| if (Res.getRefKind() != MCSymbolRefExpr::VK_None || !Res.getSymA() || | |
| Res.getSymB() || Res.getConstant()) | |
| return false; | |
| Res = | |
| MCValue::get(MCSymbolRefExpr::create(&Res.getSymA()->getSymbol(), | |
| Kind, Asm->getContext()), | |
| Res.getSymB(), Res.getConstant(), Res.getRefKind()); | |
| } | |
| if (!IsMachO) | |
| return true; | |
| const MCSymbolRefExpr *A = Res.getSymA(); | |
| const MCSymbolRefExpr *B = Res.getSymB(); | |
| // FIXME: This is small hack. Given | |
| // a = b + 4 | |
| // .long a | |
| // the OS X assembler will completely drop the 4. We should probably | |
| // include it in the relocation or produce an error if that is not | |
| // possible. | |
| // Allow constant expressions. | |
| if (!A && !B) | |
| return true; | |
| // Allows aliases with zero offset. | |
| if (Res.getConstant() == 0 && (!A || !B)) | |
| return true; | |
| } | |
| } | |
| Res = MCValue::get(SRE, nullptr, 0); | |
| return true; | |
| } | |
| case Unary: { | |
| const MCUnaryExpr *AUE = cast<MCUnaryExpr>(this); | |
| MCValue Value; | |
| if (!AUE->getSubExpr()->evaluateAsRelocatableImpl(Value, Asm, Layout, Fixup, | |
| Addrs, InSet)) | |
| return false; | |
| switch (AUE->getOpcode()) { | |
| case MCUnaryExpr::LNot: | |
| if (!Value.isAbsolute()) | |
| return false; | |
| Res = MCValue::get(!Value.getConstant()); | |
| break; | |
| case MCUnaryExpr::Minus: | |
| /// -(a - b + const) ==> (b - a - const) | |
| if (Value.getSymA() && !Value.getSymB()) | |
| return false; | |
| // The cast avoids undefined behavior if the constant is INT64_MIN. | |
| Res = MCValue::get(Value.getSymB(), Value.getSymA(), | |
| -(uint64_t)Value.getConstant()); | |
| break; | |
| case MCUnaryExpr::Not: | |
| if (!Value.isAbsolute()) | |
| return false; | |
| Res = MCValue::get(~Value.getConstant()); | |
| break; | |
| case MCUnaryExpr::Plus: | |
| Res = Value; | |
| break; | |
| } | |
| return true; | |
| } | |
| case Binary: { | |
| const MCBinaryExpr *ABE = cast<MCBinaryExpr>(this); | |
| MCValue LHSValue, RHSValue; | |
| if (!ABE->getLHS()->evaluateAsRelocatableImpl(LHSValue, Asm, Layout, Fixup, | |
| Addrs, InSet) || | |
| !ABE->getRHS()->evaluateAsRelocatableImpl(RHSValue, Asm, Layout, Fixup, | |
| Addrs, InSet)) { | |
| // Check if both are Target Expressions, see if we can compare them. | |
| if (const MCTargetExpr *L = dyn_cast<MCTargetExpr>(ABE->getLHS())) | |
| if (const MCTargetExpr *R = cast<MCTargetExpr>(ABE->getRHS())) { | |
| switch (ABE->getOpcode()) { | |
| case MCBinaryExpr::EQ: | |
| Res = MCValue::get((L->isEqualTo(R)) ? -1 : 0); | |
| return true; | |
| case MCBinaryExpr::NE: | |
| Res = MCValue::get((R->isEqualTo(R)) ? 0 : -1); | |
| return true; | |
| default: break; | |
| } | |
| } | |
| return false; | |
| } | |
| // We only support a few operations on non-constant expressions, handle | |
| // those first. | |
| if (!LHSValue.isAbsolute() || !RHSValue.isAbsolute()) { | |
| switch (ABE->getOpcode()) { | |
| default: | |
| return false; | |
| case MCBinaryExpr::Sub: | |
| // Negate RHS and add. | |
| // The cast avoids undefined behavior if the constant is INT64_MIN. | |
| return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue, | |
| RHSValue.getSymB(), RHSValue.getSymA(), | |
| -(uint64_t)RHSValue.getConstant(), Res); | |
| case MCBinaryExpr::Add: | |
| return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue, | |
| RHSValue.getSymA(), RHSValue.getSymB(), | |
| RHSValue.getConstant(), Res); | |
| } | |
| } | |
| // FIXME: We need target hooks for the evaluation. It may be limited in | |
| // width, and gas defines the result of comparisons differently from | |
| // Apple as. | |
| int64_t LHS = LHSValue.getConstant(), RHS = RHSValue.getConstant(); | |
| int64_t Result = 0; | |
| auto Op = ABE->getOpcode(); | |
| switch (Op) { | |
| case MCBinaryExpr::AShr: Result = LHS >> RHS; break; | |
| case MCBinaryExpr::Add: Result = LHS + RHS; break; | |
| case MCBinaryExpr::And: Result = LHS & RHS; break; | |
| case MCBinaryExpr::Div: | |
| case MCBinaryExpr::Mod: | |
| // Handle division by zero. gas just emits a warning and keeps going, | |
| // we try to be stricter. | |
| // FIXME: Currently the caller of this function has no way to understand | |
| // we're bailing out because of 'division by zero'. Therefore, it will | |
| // emit a 'expected relocatable expression' error. It would be nice to | |
| // change this code to emit a better diagnostic. | |
| if (RHS == 0) | |
| return false; | |
| if (ABE->getOpcode() == MCBinaryExpr::Div) | |
| Result = LHS / RHS; | |
| else | |
| Result = LHS % RHS; | |
| break; | |
| case MCBinaryExpr::EQ: Result = LHS == RHS; break; | |
| case MCBinaryExpr::GT: Result = LHS > RHS; break; | |
| case MCBinaryExpr::GTE: Result = LHS >= RHS; break; | |
| case MCBinaryExpr::LAnd: Result = LHS && RHS; break; | |
| case MCBinaryExpr::LOr: Result = LHS || RHS; break; | |
| case MCBinaryExpr::LShr: Result = uint64_t(LHS) >> uint64_t(RHS); break; | |
| case MCBinaryExpr::LT: Result = LHS < RHS; break; | |
| case MCBinaryExpr::LTE: Result = LHS <= RHS; break; | |
| case MCBinaryExpr::Mul: Result = LHS * RHS; break; | |
| case MCBinaryExpr::NE: Result = LHS != RHS; break; | |
| case MCBinaryExpr::Or: Result = LHS | RHS; break; | |
| case MCBinaryExpr::OrNot: Result = LHS | ~RHS; break; | |
| case MCBinaryExpr::Shl: Result = uint64_t(LHS) << uint64_t(RHS); break; | |
| case MCBinaryExpr::Sub: Result = LHS - RHS; break; | |
| case MCBinaryExpr::Xor: Result = LHS ^ RHS; break; | |
| } | |
| switch (Op) { | |
| default: | |
| Res = MCValue::get(Result); | |
| break; | |
| case MCBinaryExpr::EQ: | |
| case MCBinaryExpr::GT: | |
| case MCBinaryExpr::GTE: | |
| case MCBinaryExpr::LT: | |
| case MCBinaryExpr::LTE: | |
| case MCBinaryExpr::NE: | |
| // A comparison operator returns a -1 if true and 0 if false. | |
| Res = MCValue::get(Result ? -1 : 0); | |
| break; | |
| } | |
| return true; | |
| } | |
| } | |
| llvm_unreachable("Invalid assembly expression kind!"); | |
| } | |
| MCFragment *MCExpr::findAssociatedFragment() const { | |
| switch (getKind()) { | |
| case Target: | |
| // We never look through target specific expressions. | |
| return cast<MCTargetExpr>(this)->findAssociatedFragment(); | |
| case Constant: | |
| return MCSymbol::AbsolutePseudoFragment; | |
| case SymbolRef: { | |
| const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this); | |
| const MCSymbol &Sym = SRE->getSymbol(); | |
| return Sym.getFragment(); | |
| } | |
| case Unary: | |
| return cast<MCUnaryExpr>(this)->getSubExpr()->findAssociatedFragment(); | |
| case Binary: { | |
| const MCBinaryExpr *BE = cast<MCBinaryExpr>(this); | |
| MCFragment *LHS_F = BE->getLHS()->findAssociatedFragment(); | |
| MCFragment *RHS_F = BE->getRHS()->findAssociatedFragment(); | |
| // If either is absolute, return the other. | |
| if (LHS_F == MCSymbol::AbsolutePseudoFragment) | |
| return RHS_F; | |
| if (RHS_F == MCSymbol::AbsolutePseudoFragment) | |
| return LHS_F; | |
| // Not always correct, but probably the best we can do without more context. | |
| if (BE->getOpcode() == MCBinaryExpr::Sub) | |
| return MCSymbol::AbsolutePseudoFragment; | |
| // Otherwise, return the first non-null fragment. | |
| return LHS_F ? LHS_F : RHS_F; | |
| } | |
| } | |
| llvm_unreachable("Invalid assembly expression kind!"); | |
| } |