//===----------------------------------------------------------------------===//
#include "llvm/MC/MCExpr.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringSwitch.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/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetAsmBackend.h"
using namespace llvm;
-void MCExpr::print(raw_ostream &OS) const {
+#define DEBUG_TYPE "mcexpr"
+
+namespace {
+namespace stats {
+STATISTIC(MCExprEvaluate, "Number of MCExpr evaluations");
+}
+}
+
+void MCExpr::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
switch (getKind()) {
case MCExpr::Target:
- return cast<MCTargetExpr>(this)->PrintImpl(OS);
+ return cast<MCTargetExpr>(this)->printImpl(OS, MAI);
case MCExpr::Constant:
OS << cast<MCConstantExpr>(*this).getValue();
return;
case MCExpr::SymbolRef: {
- const MCSymbol &Sym = cast<MCSymbolRefExpr>(*this).getSymbol();
-
+ 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.
- if (Sym.getName()[0] == '$')
- OS << '(' << Sym << ')';
- else
- OS << Sym;
+ bool UseParens = Sym.getName()[0] == '$';
+ if (UseParens) {
+ OS << '(';
+ Sym.print(OS, MAI);
+ OS << ')';
+ } else
+ Sym.print(OS, MAI);
+
+ if (SRE.getKind() != MCSymbolRefExpr::VK_None)
+ SRE.printVariantKind(OS);
+
return;
}
case MCExpr::Unary: {
const MCUnaryExpr &UE = cast<MCUnaryExpr>(*this);
switch (UE.getOpcode()) {
- default: assert(0 && "Invalid opcode!");
case MCUnaryExpr::LNot: OS << '!'; break;
case MCUnaryExpr::Minus: OS << '-'; break;
case MCUnaryExpr::Not: OS << '~'; break;
case MCUnaryExpr::Plus: OS << '+'; break;
}
- OS << *UE.getSubExpr();
+ UE.getSubExpr()->print(OS, MAI);
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())) {
- OS << *BE.getLHS();
+ BE.getLHS()->print(OS, MAI);
} else {
- OS << '(' << *BE.getLHS() << ')';
+ OS << '(';
+ BE.getLHS()->print(OS, MAI);
+ OS << ')';
}
-
+
switch (BE.getOpcode()) {
- default: assert(0 && "Invalid opcode!");
case MCBinaryExpr::Add:
// Print "X-42" instead of "X+-42".
if (const MCConstantExpr *RHSC = dyn_cast<MCConstantExpr>(BE.getRHS())) {
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::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::NE: OS << "!="; break;
case MCBinaryExpr::Or: OS << '|'; break;
case MCBinaryExpr::Shl: OS << "<<"; break;
- case MCBinaryExpr::Shr: 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())) {
- OS << *BE.getRHS();
+ BE.getRHS()->print(OS, MAI);
} else {
- OS << '(' << *BE.getRHS() << ')';
+ OS << '(';
+ BE.getRHS()->print(OS, MAI);
+ OS << ')';
}
return;
}
}
- assert(0 && "Invalid expression kind!");
+ llvm_unreachable("Invalid expression kind!");
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void MCExpr::dump() const {
- print(dbgs());
+ dbgs() << *this;
dbgs() << '\n';
}
+#endif
/* *** */
-const MCBinaryExpr *MCBinaryExpr::Create(Opcode Opc, const MCExpr *LHS,
+const MCBinaryExpr *MCBinaryExpr::create(Opcode Opc, const MCExpr *LHS,
const MCExpr *RHS, MCContext &Ctx) {
return new (Ctx) MCBinaryExpr(Opc, LHS, RHS);
}
-const MCUnaryExpr *MCUnaryExpr::Create(Opcode Opc, const MCExpr *Expr,
+const MCUnaryExpr *MCUnaryExpr::create(Opcode Opc, const MCExpr *Expr,
MCContext &Ctx) {
return new (Ctx) MCUnaryExpr(Opc, Expr);
}
-const MCConstantExpr *MCConstantExpr::Create(int64_t Value, MCContext &Ctx) {
+const MCConstantExpr *MCConstantExpr::create(int64_t Value, MCContext &Ctx) {
return new (Ctx) MCConstantExpr(Value);
}
-const MCSymbolRefExpr *MCSymbolRefExpr::Create(const MCSymbol *Sym,
+/* *** */
+
+MCSymbolRefExpr::MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind,
+ const MCAsmInfo *MAI)
+ : MCExpr(MCExpr::SymbolRef), Kind(Kind),
+ UseParensForSymbolVariant(MAI->useParensForSymbolVariant()),
+ HasSubsectionsViaSymbols(MAI->hasSubsectionsViaSymbols()),
+ Symbol(Symbol) {
+ assert(Symbol);
+}
+
+const MCSymbolRefExpr *MCSymbolRefExpr::create(const MCSymbol *Sym,
+ VariantKind Kind,
MCContext &Ctx) {
- return new (Ctx) MCSymbolRefExpr(Sym);
+ return new (Ctx) MCSymbolRefExpr(Sym, Kind, Ctx.getAsmInfo());
}
-const MCSymbolRefExpr *MCSymbolRefExpr::Create(StringRef Name, MCContext &Ctx) {
- return Create(Ctx.GetOrCreateSymbol(Name), Ctx);
+const MCSymbolRefExpr *MCSymbolRefExpr::create(StringRef Name, VariantKind Kind,
+ MCContext &Ctx) {
+ return create(Ctx.getOrCreateSymbol(Name), Kind, Ctx);
}
-const MCSymbolRefExpr *MCSymbolRefExpr::CreateTemp(StringRef Name,
- MCContext &Ctx) {
- return Create(Ctx.GetOrCreateTemporarySymbol(Name), Ctx);
+StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
+ switch (Kind) {
+ case VK_Invalid: return "<<invalid>>";
+ case VK_None: return "<<none>>";
+
+ case VK_GOT: return "GOT";
+ case VK_GOTOFF: return "GOTOFF";
+ case VK_GOTPCREL: return "GOTPCREL";
+ 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_DTPOFF: return "DTPOFF";
+ 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_ARM_NONE: return "none";
+ 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_TLSCALL: return "tlscall";
+ case VK_ARM_TLSDESC: return "tlsdesc";
+ case VK_ARM_TLSDESCSEQ: return "tlsdescseq";
+ case VK_PPC_LO: return "l";
+ case VK_PPC_HI: return "h";
+ case VK_PPC_HA: return "ha";
+ 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_DTPMOD: return "dtpmod";
+ case VK_PPC_TPREL: return "tprel";
+ 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_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: return "dtprel";
+ 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_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_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_TLSLD: return "tlsld";
+ case VK_PPC_LOCAL: return "local";
+ case VK_Mips_GPREL: return "GPREL";
+ case VK_Mips_GOT_CALL: return "GOT_CALL";
+ case VK_Mips_GOT16: return "GOT16";
+ case VK_Mips_GOT: return "GOT";
+ case VK_Mips_ABS_HI: return "ABS_HI";
+ case VK_Mips_ABS_LO: return "ABS_LO";
+ case VK_Mips_TLSGD: return "TLSGD";
+ case VK_Mips_TLSLDM: return "TLSLDM";
+ case VK_Mips_DTPREL_HI: return "DTPREL_HI";
+ case VK_Mips_DTPREL_LO: return "DTPREL_LO";
+ case VK_Mips_GOTTPREL: return "GOTTPREL";
+ case VK_Mips_TPREL_HI: return "TPREL_HI";
+ case VK_Mips_TPREL_LO: return "TPREL_LO";
+ case VK_Mips_GPOFF_HI: return "GPOFF_HI";
+ case VK_Mips_GPOFF_LO: return "GPOFF_LO";
+ case VK_Mips_GOT_DISP: return "GOT_DISP";
+ case VK_Mips_GOT_PAGE: return "GOT_PAGE";
+ case VK_Mips_GOT_OFST: return "GOT_OFST";
+ case VK_Mips_HIGHER: return "HIGHER";
+ case VK_Mips_HIGHEST: return "HIGHEST";
+ case VK_Mips_GOT_HI16: return "GOT_HI16";
+ case VK_Mips_GOT_LO16: return "GOT_LO16";
+ case VK_Mips_CALL_HI16: return "CALL_HI16";
+ case VK_Mips_CALL_LO16: return "CALL_LO16";
+ case VK_Mips_PCREL_HI16: return "PCREL_HI16";
+ case VK_Mips_PCREL_LO16: return "PCREL_LO16";
+ case VK_COFF_IMGREL32: return "IMGREL";
+ case VK_Hexagon_PCREL: return "PCREL";
+ 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_TPREL: return "tprel";
+ case VK_DTPREL: return "dtprel";
+ }
+ llvm_unreachable("Invalid variant kind");
}
-void MCTargetExpr::Anchor() {}
+MCSymbolRefExpr::VariantKind
+MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
+ return StringSwitch<VariantKind>(Name.lower())
+ .Case("got", VK_GOT)
+ .Case("gotoff", VK_GOTOFF)
+ .Case("gotpcrel", VK_GOTPCREL)
+ .Case("got_prel", VK_GOTPCREL)
+ .Case("gottpoff", VK_GOTTPOFF)
+ .Case("indntpoff", VK_INDNTPOFF)
+ .Case("ntpoff", VK_NTPOFF)
+ .Case("gotntpoff", VK_GOTNTPOFF)
+ .Case("plt", VK_PLT)
+ .Case("tlsgd", VK_TLSGD)
+ .Case("tlsld", VK_TLSLD)
+ .Case("tlsldm", VK_TLSLDM)
+ .Case("tpoff", VK_TPOFF)
+ .Case("dtpoff", VK_DTPOFF)
+ .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("l", VK_PPC_LO)
+ .Case("h", VK_PPC_HI)
+ .Case("ha", VK_PPC_HA)
+ .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("tls", VK_PPC_TLS)
+ .Case("dtpmod", VK_PPC_DTPMOD)
+ .Case("tprel", VK_PPC_TPREL)
+ .Case("tprel@l", VK_PPC_TPREL_LO)
+ .Case("tprel@h", VK_PPC_TPREL_HI)
+ .Case("tprel@ha", VK_PPC_TPREL_HA)
+ .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", VK_PPC_DTPREL)
+ .Case("dtprel@l", VK_PPC_DTPREL_LO)
+ .Case("dtprel@h", VK_PPC_DTPREL_HI)
+ .Case("dtprel@ha", VK_PPC_DTPREL_HA)
+ .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("none", VK_ARM_NONE)
+ .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("tlscall", VK_ARM_TLSCALL)
+ .Case("tlsdesc", VK_ARM_TLSDESC)
+ .Default(VK_Invalid);
+}
+
+void MCSymbolRefExpr::printVariantKind(raw_ostream &OS) const {
+ if (UseParensForSymbolVariant)
+ OS << '(' << MCSymbolRefExpr::getVariantKindName(getKind()) << ')';
+ else
+ OS << '@' << MCSymbolRefExpr::getVariantKindName(getKind());
+}
/* *** */
-bool MCExpr::EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout *Layout) const {
+void MCTargetExpr::anchor() {}
+
+/* *** */
+
+bool MCExpr::evaluateAsAbsolute(int64_t &Res) const {
+ return evaluateAsAbsolute(Res, nullptr, nullptr, nullptr);
+}
+
+bool MCExpr::evaluateAsAbsolute(int64_t &Res,
+ const MCAsmLayout &Layout) const {
+ return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr);
+}
+
+bool MCExpr::evaluateAsAbsolute(int64_t &Res,
+ const MCAsmLayout &Layout,
+ const SectionAddrMap &Addrs) const {
+ return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, &Addrs);
+}
+
+bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const {
+ return evaluateAsAbsolute(Res, &Asm, nullptr, nullptr);
+}
+
+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) const {
+ // FIXME: The use if InSet = Addrs is a hack. Setting InSet causes us
+ // absolutize differences across sections and that is what the MachO writer
+ // uses Addrs for.
+ return evaluateAsAbsolute(Res, Asm, Layout, Addrs, Addrs);
+}
+
+bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
+ const MCAsmLayout *Layout,
+ const SectionAddrMap *Addrs, bool InSet) const {
MCValue Value;
-
- if (!EvaluateAsRelocatable(Value, Layout) || !Value.isAbsolute())
- return false;
+ // 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 true;
+
+ return IsRelocatable && Value.isAbsolute();
}
-static bool EvaluateSymbolicAdd(const MCValue &LHS, const MCSymbol *RHS_A,
- const MCSymbol *RHS_B, int64_t RHS_Cst,
- MCValue &Res) {
- // We can't add or subtract two symbols.
- if ((LHS.getSymA() && RHS_A) ||
- (LHS.getSymB() && RHS_B))
+/// \brief 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;
+
+ if (SA.getFragment() == SB.getFragment()) {
+ Addend += (SA.getOffset() - SB.getOffset());
+
+ // Pointers to Thumb symbols need to have their low-bit set to allow
+ // for interworking.
+ if (Asm->isThumbFunc(&SA))
+ Addend |= 1;
+
+ // Clear the symbol expr pointers to indicate we have folded these
+ // operands.
+ A = B = nullptr;
+ return;
+ }
+
+ if (!Layout)
+ return;
+
+ const MCSection &SecA = *SA.getFragment()->getParent();
+ const MCSection &SecB = *SB.getFragment()->getParent();
+
+ if ((&SecA != &SecB) && !Addrs)
+ return;
+
+ // Eagerly evaluate.
+ Addend += Layout->getSymbolOffset(A->getSymbol()) -
+ Layout->getSymbolOffset(B->getSymbol());
+ if (Addrs && (&SecA != &SecB))
+ Addend += (Addrs->lookup(&SecA) - Addrs->lookup(&SecB));
+
+ // Pointers to Thumb symbols need to have their low-bit set to allow
+ // for interworking.
+ if (Asm->isThumbFunc(&SA))
+ Addend |= 1;
+
+ // Clear the symbol expr pointers to indicate we have folded these
+ // operands.
+ A = B = nullptr;
+}
+
+/// \brief 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 aggresively 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;
+
+ // If we have a negated symbol, then we must have also have a non-negated
+ // symbol in order to encode the expression.
+ if (B && !A)
return false;
- const MCSymbol *A = LHS.getSymA() ? LHS.getSymA() : RHS_A;
- const MCSymbol *B = LHS.getSymB() ? LHS.getSymB() : RHS_B;
- if (B) {
- // If we have a negated symbol, then we must have also have a non-negated
- // symbol in order to encode the expression. We can do this check later to
- // permit expressions which eventually fold to a representable form -- such
- // as (a + (0 - b)) -- if necessary.
- if (!A)
+ 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, const MCAssembler *Asm, bool InSet) {
+ const MCExpr *Expr = Sym.getVariableValue();
+ const auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr);
+ if (Inner) {
+ if (Inner->getKind() == MCSymbolRefExpr::VK_WEAKREF)
return false;
}
- Res = MCValue::get(A, B, LHS.getConstant() + RHS_Cst);
- return true;
+
+ if (InSet)
+ return true;
+ if (!Asm)
+ return false;
+ return !Asm->getWriter().isWeak(Sym);
}
-bool MCExpr::EvaluateAsRelocatable(MCValue &Res,
- const MCAsmLayout *Layout) const {
+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);
-
+ return cast<MCTargetExpr>(this)->evaluateAsRelocatableImpl(Res, Layout,
+ Fixup);
+
case Constant:
Res = MCValue::get(cast<MCConstantExpr>(this)->getValue());
return true;
case SymbolRef: {
- const MCSymbol &Sym = cast<MCSymbolRefExpr>(this)->getSymbol();
+ const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
+ const MCSymbol &Sym = SRE->getSymbol();
// Evaluate recursively if this is a variable.
- if (Sym.isVariable()) {
- if (!Sym.getValue()->EvaluateAsRelocatable(Res, Layout))
- return false;
-
- // Absolutize symbol differences between defined symbols when we have a
- // layout object and the target requests it.
- if (Layout && Res.getSymB() &&
- Layout->getAssembler().getBackend().hasAbsolutizedSet() &&
- Res.getSymA()->isDefined() && Res.getSymB()->isDefined()) {
- MCSymbolData &A = Layout->getAssembler().getSymbolData(*Res.getSymA());
- MCSymbolData &B = Layout->getAssembler().getSymbolData(*Res.getSymB());
- Res = MCValue::get(+ A.getFragment()->getAddress() + A.getOffset()
- - B.getFragment()->getAddress() - B.getOffset()
- + Res.getConstant());
+ if (Sym.isVariable() && SRE->getKind() == MCSymbolRefExpr::VK_None &&
+ canExpand(Sym, Asm, InSet)) {
+ bool IsMachO = SRE->hasSubsectionsViaSymbols();
+ if (Sym.getVariableValue()->evaluateAsRelocatableImpl(
+ Res, Asm, Layout, Fixup, Addrs, InSet || IsMachO)) {
+ 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.
+ if (!A && !B)
+ return true;
}
-
- return true;
}
- Res = MCValue::get(&Sym, 0, 0);
+ Res = MCValue::get(SRE, nullptr, 0);
return true;
}
const MCUnaryExpr *AUE = cast<MCUnaryExpr>(this);
MCValue Value;
- if (!AUE->getSubExpr()->EvaluateAsRelocatable(Value, Layout))
+ if (!AUE->getSubExpr()->evaluateAsRelocatableImpl(Value, Asm, Layout, Fixup,
+ Addrs, InSet))
return false;
switch (AUE->getOpcode()) {
/// -(a - b + const) ==> (b - a - const)
if (Value.getSymA() && !Value.getSymB())
return false;
- Res = MCValue::get(Value.getSymB(), Value.getSymA(),
- -Value.getConstant());
+ Res = MCValue::get(Value.getSymB(), Value.getSymA(),
+ -Value.getConstant());
break;
case MCUnaryExpr::Not:
if (!Value.isAbsolute())
return false;
- Res = MCValue::get(~Value.getConstant());
+ Res = MCValue::get(~Value.getConstant());
break;
case MCUnaryExpr::Plus:
Res = Value;
case Binary: {
const MCBinaryExpr *ABE = cast<MCBinaryExpr>(this);
MCValue LHSValue, RHSValue;
-
- if (!ABE->getLHS()->EvaluateAsRelocatable(LHSValue, Layout) ||
- !ABE->getRHS()->EvaluateAsRelocatable(RHSValue, Layout))
+
+ if (!ABE->getLHS()->evaluateAsRelocatableImpl(LHSValue, Asm, Layout, Fixup,
+ Addrs, InSet) ||
+ !ABE->getRHS()->evaluateAsRelocatableImpl(RHSValue, Asm, Layout, Fixup,
+ Addrs, InSet))
return false;
// We only support a few operations on non-constant expressions, handle
return false;
case MCBinaryExpr::Sub:
// Negate RHS and add.
- return EvaluateSymbolicAdd(LHSValue,
+ return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
RHSValue.getSymB(), RHSValue.getSymA(),
- -RHSValue.getConstant(),
- Res);
+ -RHSValue.getConstant(), Res);
case MCBinaryExpr::Add:
- return EvaluateSymbolicAdd(LHSValue,
+ return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
RHSValue.getSymA(), RHSValue.getSymB(),
- RHSValue.getConstant(),
- Res);
+ RHSValue.getConstant(), Res);
}
}
// FIXME: We need target hooks for the evaluation. It may be limited in
- // width, and gas defines the result of comparisons and right shifts
- // differently from Apple as.
+ // width, and gas defines the result of comparisons differently from
+ // Apple as.
int64_t LHS = LHSValue.getConstant(), RHS = RHSValue.getConstant();
int64_t Result = 0;
switch (ABE->getOpcode()) {
+ case MCBinaryExpr::AShr: Result = LHS >> RHS; break;
case MCBinaryExpr::Add: Result = LHS + RHS; break;
case MCBinaryExpr::And: Result = LHS & RHS; break;
- case MCBinaryExpr::Div: Result = LHS / RHS; break;
+ case MCBinaryExpr::Div:
+ // 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;
+ 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::Mod: 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::Shl: Result = LHS << RHS; break;
- case MCBinaryExpr::Shr: 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;
}
}
}
- assert(0 && "Invalid assembly expression kind!");
- return false;
+ llvm_unreachable("Invalid assembly expression kind!");
+}
+
+MCSection *MCExpr::findAssociatedSection() const {
+ switch (getKind()) {
+ case Target:
+ // We never look through target specific expressions.
+ return cast<MCTargetExpr>(this)->findAssociatedSection();
+
+ case Constant:
+ return MCSymbol::AbsolutePseudoSection;
+
+ case SymbolRef: {
+ const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
+ const MCSymbol &Sym = SRE->getSymbol();
+
+ if (Sym.isDefined())
+ return &Sym.getSection();
+
+ return nullptr;
+ }
+
+ case Unary:
+ return cast<MCUnaryExpr>(this)->getSubExpr()->findAssociatedSection();
+
+ case Binary: {
+ const MCBinaryExpr *BE = cast<MCBinaryExpr>(this);
+ MCSection *LHS_S = BE->getLHS()->findAssociatedSection();
+ MCSection *RHS_S = BE->getRHS()->findAssociatedSection();
+
+ // If either section is absolute, return the other.
+ if (LHS_S == MCSymbol::AbsolutePseudoSection)
+ return RHS_S;
+ if (RHS_S == MCSymbol::AbsolutePseudoSection)
+ return LHS_S;
+
+ // Not always correct, but probably the best we can do without more context.
+ if (BE->getOpcode() == MCBinaryExpr::Sub)
+ return MCSymbol::AbsolutePseudoSection;
+
+ // Otherwise, return the first non-null section.
+ return LHS_S ? LHS_S : RHS_S;
+ }
+ }
+
+ llvm_unreachable("Invalid assembly expression kind!");
}
projects / oota-llvm.git / blobdiff