#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCObjectFormat.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;
namespace {
// absolute names.
bool UseParens = Sym.getName()[0] == '$';
- if (SRE.getKind() == MCSymbolRefExpr::VK_ARM_HI16 ||
- SRE.getKind() == MCSymbolRefExpr::VK_ARM_LO16)
- OS << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
-
- if (SRE.getKind() == MCSymbolRefExpr::VK_PPC_HA16 ||
- SRE.getKind() == MCSymbolRefExpr::VK_PPC_LO16) {
+ if (SRE.getKind() == MCSymbolRefExpr::VK_PPC_DARWIN_HA16 ||
+ SRE.getKind() == MCSymbolRefExpr::VK_PPC_DARWIN_LO16) {
OS << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
UseParens = true;
}
else
OS << Sym;
- if (SRE.getKind() == MCSymbolRefExpr::VK_ARM_PLT ||
+ if (SRE.getKind() == MCSymbolRefExpr::VK_ARM_NONE ||
+ SRE.getKind() == MCSymbolRefExpr::VK_ARM_PLT ||
SRE.getKind() == MCSymbolRefExpr::VK_ARM_TLSGD ||
SRE.getKind() == MCSymbolRefExpr::VK_ARM_GOT ||
SRE.getKind() == MCSymbolRefExpr::VK_ARM_GOTOFF ||
SRE.getKind() == MCSymbolRefExpr::VK_ARM_TPOFF ||
- SRE.getKind() == MCSymbolRefExpr::VK_ARM_GOTTPOFF)
+ SRE.getKind() == MCSymbolRefExpr::VK_ARM_GOTTPOFF ||
+ SRE.getKind() == MCSymbolRefExpr::VK_ARM_TARGET1 ||
+ SRE.getKind() == MCSymbolRefExpr::VK_ARM_TARGET2 ||
+ SRE.getKind() == MCSymbolRefExpr::VK_ARM_PREL31)
OS << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
else if (SRE.getKind() != MCSymbolRefExpr::VK_None &&
- SRE.getKind() != MCSymbolRefExpr::VK_ARM_HI16 &&
- SRE.getKind() != MCSymbolRefExpr::VK_ARM_LO16 &&
- SRE.getKind() != MCSymbolRefExpr::VK_PPC_HA16 &&
- SRE.getKind() != MCSymbolRefExpr::VK_PPC_LO16)
+ SRE.getKind() != MCSymbolRefExpr::VK_PPC_DARWIN_HA16 &&
+ SRE.getKind() != MCSymbolRefExpr::VK_PPC_DARWIN_LO16)
OS << '@' << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
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;
}
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())) {
}
}
- assert(0 && "Invalid expression kind!");
+ llvm_unreachable("Invalid expression kind!");
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void MCExpr::dump() const {
print(dbgs());
dbgs() << '\n';
}
+#endif
/* *** */
StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
switch (Kind) {
- default:
case VK_Invalid: return "<<invalid>>";
case VK_None: return "<<none>>";
case VK_TPOFF: return "TPOFF";
case VK_DTPOFF: return "DTPOFF";
case VK_TLVP: return "TLVP";
- case VK_ARM_HI16: return ":upper16:";
- case VK_ARM_LO16: return ":lower16:";
+ case VK_SECREL: return "SECREL";
+ case VK_ARM_NONE: return "(NONE)";
case VK_ARM_PLT: return "(PLT)";
case VK_ARM_GOT: return "(GOT)";
case VK_ARM_GOTOFF: return "(GOTOFF)";
case VK_ARM_TPOFF: return "(tpoff)";
case VK_ARM_GOTTPOFF: return "(gottpoff)";
case VK_ARM_TLSGD: return "(tlsgd)";
- case VK_PPC_TOC: return "toc";
- case VK_PPC_HA16: return "ha16";
- case VK_PPC_LO16: return "lo16";
+ case VK_ARM_TARGET1: return "(target1)";
+ case VK_ARM_TARGET2: return "(target2)";
+ case VK_ARM_PREL31: return "(prel31)";
+ case VK_PPC_TOC: return "tocbase";
+ case VK_PPC_TOC_ENTRY: return "toc";
+ case VK_PPC_DARWIN_HA16: return "ha16";
+ case VK_PPC_DARWIN_LO16: return "lo16";
+ case VK_PPC_GAS_HA16: return "ha";
+ case VK_PPC_GAS_LO16: return "l";
+ case VK_PPC_TPREL16_HA: return "tprel@ha";
+ case VK_PPC_TPREL16_LO: return "tprel@l";
+ case VK_PPC_DTPREL16_HA: return "dtprel@ha";
+ case VK_PPC_DTPREL16_LO: return "dtprel@l";
+ case VK_PPC_TOC16_HA: return "toc@ha";
+ case VK_PPC_TOC16_LO: return "toc@l";
+ case VK_PPC_GOT_TPREL16_DS: return "got@tprel";
+ case VK_PPC_TLS: return "tls";
+ case VK_PPC_GOT_TLSGD16_HA: return "got@tlsgd@ha";
+ case VK_PPC_GOT_TLSGD16_LO: return "got@tlsgd@l";
+ case VK_PPC_GOT_TLSLD16_HA: return "got@tlsld@ha";
+ case VK_PPC_GOT_TLSLD16_LO: return "got@tlsld@l";
+ case VK_PPC_TLSGD: return "tlsgd";
+ case VK_PPC_TLSLD: return "tlsld";
+ 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";
}
+ llvm_unreachable("Invalid variant kind");
}
MCSymbolRefExpr::VariantKind
MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
return StringSwitch<VariantKind>(Name)
.Case("GOT", VK_GOT)
+ .Case("got", VK_GOT)
.Case("GOTOFF", VK_GOTOFF)
+ .Case("gotoff", VK_GOTOFF)
.Case("GOTPCREL", VK_GOTPCREL)
+ .Case("gotpcrel", VK_GOTPCREL)
.Case("GOTTPOFF", VK_GOTTPOFF)
+ .Case("gottpoff", VK_GOTTPOFF)
.Case("INDNTPOFF", VK_INDNTPOFF)
+ .Case("indntpoff", VK_INDNTPOFF)
.Case("NTPOFF", VK_NTPOFF)
+ .Case("ntpoff", VK_NTPOFF)
.Case("GOTNTPOFF", VK_GOTNTPOFF)
+ .Case("gotntpoff", VK_GOTNTPOFF)
.Case("PLT", VK_PLT)
+ .Case("plt", VK_PLT)
.Case("TLSGD", VK_TLSGD)
+ .Case("tlsgd", VK_TLSGD)
.Case("TLSLD", VK_TLSLD)
+ .Case("tlsld", VK_TLSLD)
.Case("TLSLDM", VK_TLSLDM)
+ .Case("tlsldm", VK_TLSLDM)
.Case("TPOFF", VK_TPOFF)
+ .Case("tpoff", VK_TPOFF)
.Case("DTPOFF", VK_DTPOFF)
+ .Case("dtpoff", VK_DTPOFF)
.Case("TLVP", VK_TLVP)
+ .Case("tlvp", VK_TLVP)
.Default(VK_Invalid);
}
/* *** */
-void MCTargetExpr::Anchor() {}
+void MCTargetExpr::anchor() {}
/* *** */
return true;
}
- if (!EvaluateAsRelocatableImpl(Value, Asm, Layout, Addrs, Addrs) ||
- !Value.isAbsolute()) {
- // EvaluateAsAbsolute is defined to return the "current value" of
- // the expression if we are given a Layout object, even in cases
- // when the value is not fixed.
- if (Layout) {
- Res = Value.getConstant();
- if (Value.getSymA()) {
- Res += Layout->getSymbolOffset(
- &Layout->getAssembler().getSymbolData(Value.getSymA()->getSymbol()));
- }
- if (Value.getSymB()) {
- Res -= Layout->getSymbolOffset(
- &Layout->getAssembler().getSymbolData(Value.getSymB()->getSymbol()));
- }
- }
- return false;
- }
+ // 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.
+ bool IsRelocatable =
+ EvaluateAsRelocatableImpl(Value, Asm, Layout, Addrs, /*InSet*/ Addrs);
+ // Record the current value.
Res = Value.getConstant();
- return true;
+
+ return IsRelocatable && Value.isAbsolute();
+}
+
+/// \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;
+
+ MCSymbolData &AD = Asm->getSymbolData(SA);
+ MCSymbolData &BD = Asm->getSymbolData(SB);
+
+ if (AD.getFragment() == BD.getFragment()) {
+ Addend += (AD.getOffset() - BD.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 = 0;
+ return;
+ }
+
+ if (!Layout)
+ return;
+
+ const MCSectionData &SecA = *AD.getFragment()->getParent();
+ const MCSectionData &SecB = *BD.getFragment()->getParent();
+
+ if ((&SecA != &SecB) && !Addrs)
+ return;
+
+ // Eagerly evaluate.
+ Addend += (Layout->getSymbolOffset(&Asm->getSymbolData(A->getSymbol())) -
+ Layout->getSymbolOffset(&Asm->getSymbolData(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 = 0;
}
/// \brief Evaluate the result of an add between (conceptually) two MCValues.
///
/// \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,
// 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 (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)
- return false;
- }
-
- // Absolutize symbol differences between defined symbols when we have a
- // layout object and the target requests it.
-
- assert((!Layout || Asm) &&
- "Must have an assembler object if layout is given!");
-
- if (Asm && A && B) {
- const MCSymbol &SA = A->getSymbol();
- const MCSymbol &SB = B->getSymbol();
- const MCObjectFormat &F = Asm->getBackend().getObjectFormat();
- if (SA.isDefined() && SB.isDefined() && F.isAbsolute(InSet, SA, SB)) {
- MCSymbolData &AD = Asm->getSymbolData(A->getSymbol());
- MCSymbolData &BD = Asm->getSymbolData(B->getSymbol());
-
- if (AD.getFragment() == BD.getFragment()) {
- Res = MCValue::get(+ AD.getOffset()
- - BD.getOffset()
- + Result_Cst);
- return true;
- }
- if (Layout) {
- const MCSectionData &SecA = *AD.getFragment()->getParent();
- const MCSectionData &SecB = *BD.getFragment()->getParent();
- int64_t Val = + Layout->getSymbolOffset(&AD)
- - Layout->getSymbolOffset(&BD)
- + Result_Cst;
- if (&SecA != &SecB) {
- if (!Addrs)
- return false;
- Val += Addrs->lookup(&SecA);
- Val -= Addrs->lookup(&SecB);
- }
- Res = MCValue::get(Val);
- return true;
- }
- }
- }
+ // 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;
Res = MCValue::get(A, B, Result_Cst);
return true;
}
bool MCExpr::EvaluateAsRelocatable(MCValue &Res,
- const MCAsmLayout *Layout) const {
- if (Layout)
- return EvaluateAsRelocatableImpl(Res, &Layout->getAssembler(), Layout,
- 0, false);
- else
- return EvaluateAsRelocatableImpl(Res, 0, 0, 0, false);
+ const MCAsmLayout &Layout) const {
+ return EvaluateAsRelocatableImpl(Res, &Layout.getAssembler(), &Layout,
+ 0, false);
}
bool MCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
}
}
- assert(0 && "Invalid assembly expression kind!");
- return false;
+ llvm_unreachable("Invalid assembly expression kind!");
+}
+
+const 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 0;
+ }
+
+ case Unary:
+ return cast<MCUnaryExpr>(this)->getSubExpr()->FindAssociatedSection();
+
+ case Binary: {
+ const MCBinaryExpr *BE = cast<MCBinaryExpr>(this);
+ const MCSection *LHS_S = BE->getLHS()->FindAssociatedSection();
+ const 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;
+
+ // Otherwise, return the first non-null section.
+ return LHS_S ? LHS_S : RHS_S;
+ }
+ }
+
+ llvm_unreachable("Invalid assembly expression kind!");
}
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