mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-26 07:29:55 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207526 91177308-0d34-0410-b5e6-96231b3b80d8
834 lines
29 KiB
C++
834 lines
29 KiB
C++
//===- MCExpr.cpp - Assembly Level Expression Implementation --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCExpr.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "mcexpr"
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namespace {
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namespace stats {
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STATISTIC(MCExprEvaluate, "Number of MCExpr evaluations");
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}
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}
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void MCExpr::print(raw_ostream &OS) const {
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switch (getKind()) {
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case MCExpr::Target:
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return cast<MCTargetExpr>(this)->PrintImpl(OS);
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case MCExpr::Constant:
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OS << cast<MCConstantExpr>(*this).getValue();
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return;
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case MCExpr::SymbolRef: {
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const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(*this);
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const MCSymbol &Sym = SRE.getSymbol();
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// Parenthesize names that start with $ so that they don't look like
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// absolute names.
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bool UseParens = Sym.getName()[0] == '$';
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if (UseParens)
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OS << '(' << Sym << ')';
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else
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OS << Sym;
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if (SRE.getKind() != MCSymbolRefExpr::VK_None) {
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if (SRE.getMCAsmInfo().useParensForSymbolVariant())
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OS << '(' << MCSymbolRefExpr::getVariantKindName(SRE.getKind()) << ')';
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else
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OS << '@' << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
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}
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return;
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}
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case MCExpr::Unary: {
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const MCUnaryExpr &UE = cast<MCUnaryExpr>(*this);
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switch (UE.getOpcode()) {
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case MCUnaryExpr::LNot: OS << '!'; break;
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case MCUnaryExpr::Minus: OS << '-'; break;
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case MCUnaryExpr::Not: OS << '~'; break;
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case MCUnaryExpr::Plus: OS << '+'; break;
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}
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OS << *UE.getSubExpr();
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return;
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}
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case MCExpr::Binary: {
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const MCBinaryExpr &BE = cast<MCBinaryExpr>(*this);
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// Only print parens around the LHS if it is non-trivial.
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if (isa<MCConstantExpr>(BE.getLHS()) || isa<MCSymbolRefExpr>(BE.getLHS())) {
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OS << *BE.getLHS();
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} else {
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OS << '(' << *BE.getLHS() << ')';
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}
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switch (BE.getOpcode()) {
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case MCBinaryExpr::Add:
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// Print "X-42" instead of "X+-42".
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if (const MCConstantExpr *RHSC = dyn_cast<MCConstantExpr>(BE.getRHS())) {
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if (RHSC->getValue() < 0) {
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OS << RHSC->getValue();
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return;
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}
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}
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OS << '+';
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break;
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case MCBinaryExpr::And: OS << '&'; break;
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case MCBinaryExpr::Div: OS << '/'; break;
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case MCBinaryExpr::EQ: OS << "=="; break;
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case MCBinaryExpr::GT: OS << '>'; break;
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case MCBinaryExpr::GTE: OS << ">="; break;
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case MCBinaryExpr::LAnd: OS << "&&"; break;
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case MCBinaryExpr::LOr: OS << "||"; break;
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case MCBinaryExpr::LT: OS << '<'; break;
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case MCBinaryExpr::LTE: OS << "<="; break;
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case MCBinaryExpr::Mod: OS << '%'; break;
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case MCBinaryExpr::Mul: OS << '*'; break;
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case MCBinaryExpr::NE: OS << "!="; break;
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case MCBinaryExpr::Or: OS << '|'; break;
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case MCBinaryExpr::Shl: OS << "<<"; break;
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case MCBinaryExpr::Shr: OS << ">>"; break;
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case MCBinaryExpr::Sub: OS << '-'; break;
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case MCBinaryExpr::Xor: OS << '^'; break;
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}
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// Only print parens around the LHS if it is non-trivial.
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if (isa<MCConstantExpr>(BE.getRHS()) || isa<MCSymbolRefExpr>(BE.getRHS())) {
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OS << *BE.getRHS();
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} else {
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OS << '(' << *BE.getRHS() << ')';
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}
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return;
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}
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}
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llvm_unreachable("Invalid expression kind!");
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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void MCExpr::dump() const {
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print(dbgs());
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dbgs() << '\n';
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}
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#endif
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/* *** */
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const MCBinaryExpr *MCBinaryExpr::Create(Opcode Opc, const MCExpr *LHS,
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const MCExpr *RHS, MCContext &Ctx) {
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return new (Ctx) MCBinaryExpr(Opc, LHS, RHS);
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}
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const MCUnaryExpr *MCUnaryExpr::Create(Opcode Opc, const MCExpr *Expr,
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MCContext &Ctx) {
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return new (Ctx) MCUnaryExpr(Opc, Expr);
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}
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const MCConstantExpr *MCConstantExpr::Create(int64_t Value, MCContext &Ctx) {
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return new (Ctx) MCConstantExpr(Value);
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}
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/* *** */
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const MCSymbolRefExpr *MCSymbolRefExpr::Create(const MCSymbol *Sym,
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VariantKind Kind,
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MCContext &Ctx) {
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return new (Ctx) MCSymbolRefExpr(Sym, Kind, Ctx.getAsmInfo());
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}
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const MCSymbolRefExpr *MCSymbolRefExpr::Create(StringRef Name, VariantKind Kind,
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MCContext &Ctx) {
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return Create(Ctx.GetOrCreateSymbol(Name), Kind, Ctx);
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}
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StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
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switch (Kind) {
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case VK_Invalid: return "<<invalid>>";
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case VK_None: return "<<none>>";
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case VK_GOT: return "GOT";
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case VK_GOTOFF: return "GOTOFF";
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case VK_GOTPCREL: return "GOTPCREL";
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case VK_GOTTPOFF: return "GOTTPOFF";
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case VK_INDNTPOFF: return "INDNTPOFF";
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case VK_NTPOFF: return "NTPOFF";
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case VK_GOTNTPOFF: return "GOTNTPOFF";
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case VK_PLT: return "PLT";
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case VK_TLSGD: return "TLSGD";
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case VK_TLSLD: return "TLSLD";
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case VK_TLSLDM: return "TLSLDM";
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case VK_TPOFF: return "TPOFF";
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case VK_DTPOFF: return "DTPOFF";
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case VK_TLVP: return "TLVP";
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case VK_TLVPPAGE: return "TLVPPAGE";
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case VK_TLVPPAGEOFF: return "TLVPPAGEOFF";
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case VK_PAGE: return "PAGE";
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case VK_PAGEOFF: return "PAGEOFF";
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case VK_GOTPAGE: return "GOTPAGE";
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case VK_GOTPAGEOFF: return "GOTPAGEOFF";
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case VK_SECREL: return "SECREL32";
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case VK_WEAKREF: return "WEAKREF";
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case VK_ARM_NONE: return "none";
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case VK_ARM_TARGET1: return "target1";
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case VK_ARM_TARGET2: return "target2";
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case VK_ARM_PREL31: return "prel31";
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case VK_ARM_TLSLDO: return "tlsldo";
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case VK_ARM_TLSCALL: return "tlscall";
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case VK_ARM_TLSDESC: return "tlsdesc";
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case VK_ARM_TLSDESCSEQ: return "tlsdescseq";
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case VK_PPC_LO: return "l";
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case VK_PPC_HI: return "h";
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case VK_PPC_HA: return "ha";
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case VK_PPC_HIGHER: return "higher";
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case VK_PPC_HIGHERA: return "highera";
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case VK_PPC_HIGHEST: return "highest";
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case VK_PPC_HIGHESTA: return "highesta";
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case VK_PPC_GOT_LO: return "got@l";
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case VK_PPC_GOT_HI: return "got@h";
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case VK_PPC_GOT_HA: return "got@ha";
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case VK_PPC_TOCBASE: return "tocbase";
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case VK_PPC_TOC: return "toc";
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case VK_PPC_TOC_LO: return "toc@l";
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case VK_PPC_TOC_HI: return "toc@h";
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case VK_PPC_TOC_HA: return "toc@ha";
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case VK_PPC_DTPMOD: return "dtpmod";
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case VK_PPC_TPREL: return "tprel";
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case VK_PPC_TPREL_LO: return "tprel@l";
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case VK_PPC_TPREL_HI: return "tprel@h";
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case VK_PPC_TPREL_HA: return "tprel@ha";
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case VK_PPC_TPREL_HIGHER: return "tprel@higher";
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case VK_PPC_TPREL_HIGHERA: return "tprel@highera";
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case VK_PPC_TPREL_HIGHEST: return "tprel@highest";
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case VK_PPC_TPREL_HIGHESTA: return "tprel@highesta";
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case VK_PPC_DTPREL: return "dtprel";
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case VK_PPC_DTPREL_LO: return "dtprel@l";
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case VK_PPC_DTPREL_HI: return "dtprel@h";
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case VK_PPC_DTPREL_HA: return "dtprel@ha";
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case VK_PPC_DTPREL_HIGHER: return "dtprel@higher";
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case VK_PPC_DTPREL_HIGHERA: return "dtprel@highera";
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case VK_PPC_DTPREL_HIGHEST: return "dtprel@highest";
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case VK_PPC_DTPREL_HIGHESTA: return "dtprel@highesta";
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case VK_PPC_GOT_TPREL: return "got@tprel";
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case VK_PPC_GOT_TPREL_LO: return "got@tprel@l";
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case VK_PPC_GOT_TPREL_HI: return "got@tprel@h";
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case VK_PPC_GOT_TPREL_HA: return "got@tprel@ha";
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case VK_PPC_GOT_DTPREL: return "got@dtprel";
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case VK_PPC_GOT_DTPREL_LO: return "got@dtprel@l";
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case VK_PPC_GOT_DTPREL_HI: return "got@dtprel@h";
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case VK_PPC_GOT_DTPREL_HA: return "got@dtprel@ha";
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case VK_PPC_TLS: return "tls";
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case VK_PPC_GOT_TLSGD: return "got@tlsgd";
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case VK_PPC_GOT_TLSGD_LO: return "got@tlsgd@l";
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case VK_PPC_GOT_TLSGD_HI: return "got@tlsgd@h";
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case VK_PPC_GOT_TLSGD_HA: return "got@tlsgd@ha";
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case VK_PPC_TLSGD: return "tlsgd";
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case VK_PPC_GOT_TLSLD: return "got@tlsld";
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case VK_PPC_GOT_TLSLD_LO: return "got@tlsld@l";
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case VK_PPC_GOT_TLSLD_HI: return "got@tlsld@h";
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case VK_PPC_GOT_TLSLD_HA: return "got@tlsld@ha";
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case VK_PPC_TLSLD: return "tlsld";
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case VK_Mips_GPREL: return "GPREL";
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case VK_Mips_GOT_CALL: return "GOT_CALL";
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case VK_Mips_GOT16: return "GOT16";
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case VK_Mips_GOT: return "GOT";
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case VK_Mips_ABS_HI: return "ABS_HI";
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case VK_Mips_ABS_LO: return "ABS_LO";
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case VK_Mips_TLSGD: return "TLSGD";
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case VK_Mips_TLSLDM: return "TLSLDM";
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case VK_Mips_DTPREL_HI: return "DTPREL_HI";
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case VK_Mips_DTPREL_LO: return "DTPREL_LO";
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case VK_Mips_GOTTPREL: return "GOTTPREL";
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case VK_Mips_TPREL_HI: return "TPREL_HI";
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case VK_Mips_TPREL_LO: return "TPREL_LO";
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case VK_Mips_GPOFF_HI: return "GPOFF_HI";
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case VK_Mips_GPOFF_LO: return "GPOFF_LO";
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case VK_Mips_GOT_DISP: return "GOT_DISP";
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case VK_Mips_GOT_PAGE: return "GOT_PAGE";
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case VK_Mips_GOT_OFST: return "GOT_OFST";
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case VK_Mips_HIGHER: return "HIGHER";
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case VK_Mips_HIGHEST: return "HIGHEST";
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case VK_Mips_GOT_HI16: return "GOT_HI16";
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case VK_Mips_GOT_LO16: return "GOT_LO16";
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case VK_Mips_CALL_HI16: return "CALL_HI16";
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case VK_Mips_CALL_LO16: return "CALL_LO16";
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case VK_COFF_IMGREL32: return "IMGREL32";
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}
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llvm_unreachable("Invalid variant kind");
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}
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MCSymbolRefExpr::VariantKind
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MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
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return StringSwitch<VariantKind>(Name)
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.Case("GOT", VK_GOT)
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.Case("got", VK_GOT)
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.Case("GOTOFF", VK_GOTOFF)
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.Case("gotoff", VK_GOTOFF)
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.Case("GOTPCREL", VK_GOTPCREL)
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.Case("gotpcrel", VK_GOTPCREL)
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.Case("GOT_PREL", VK_GOTPCREL)
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.Case("got_prel", VK_GOTPCREL)
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.Case("GOTTPOFF", VK_GOTTPOFF)
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.Case("gottpoff", VK_GOTTPOFF)
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.Case("INDNTPOFF", VK_INDNTPOFF)
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.Case("indntpoff", VK_INDNTPOFF)
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.Case("NTPOFF", VK_NTPOFF)
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.Case("ntpoff", VK_NTPOFF)
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.Case("GOTNTPOFF", VK_GOTNTPOFF)
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.Case("gotntpoff", VK_GOTNTPOFF)
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.Case("PLT", VK_PLT)
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.Case("plt", VK_PLT)
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.Case("TLSGD", VK_TLSGD)
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.Case("tlsgd", VK_TLSGD)
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.Case("TLSLD", VK_TLSLD)
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.Case("tlsld", VK_TLSLD)
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.Case("TLSLDM", VK_TLSLDM)
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.Case("tlsldm", VK_TLSLDM)
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.Case("TPOFF", VK_TPOFF)
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.Case("tpoff", VK_TPOFF)
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.Case("DTPOFF", VK_DTPOFF)
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.Case("dtpoff", VK_DTPOFF)
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.Case("TLVP", VK_TLVP)
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.Case("tlvp", VK_TLVP)
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.Case("TLVPPAGE", VK_TLVPPAGE)
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.Case("tlvppage", VK_TLVPPAGE)
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.Case("TLVPPAGEOFF", VK_TLVPPAGEOFF)
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.Case("tlvppageoff", VK_TLVPPAGEOFF)
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.Case("PAGE", VK_PAGE)
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.Case("page", VK_PAGE)
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.Case("PAGEOFF", VK_PAGEOFF)
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.Case("pageoff", VK_PAGEOFF)
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.Case("GOTPAGE", VK_GOTPAGE)
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.Case("gotpage", VK_GOTPAGE)
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.Case("GOTPAGEOFF", VK_GOTPAGEOFF)
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.Case("gotpageoff", VK_GOTPAGEOFF)
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.Case("IMGREL", VK_COFF_IMGREL32)
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.Case("imgrel", VK_COFF_IMGREL32)
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.Case("SECREL32", VK_SECREL)
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.Case("secrel32", VK_SECREL)
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.Case("L", VK_PPC_LO)
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.Case("l", VK_PPC_LO)
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.Case("H", VK_PPC_HI)
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.Case("h", VK_PPC_HI)
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.Case("HA", VK_PPC_HA)
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.Case("ha", VK_PPC_HA)
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.Case("HIGHER", VK_PPC_HIGHER)
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.Case("higher", VK_PPC_HIGHER)
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.Case("HIGHERA", VK_PPC_HIGHERA)
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.Case("highera", VK_PPC_HIGHERA)
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.Case("HIGHEST", VK_PPC_HIGHEST)
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.Case("highest", VK_PPC_HIGHEST)
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.Case("HIGHESTA", VK_PPC_HIGHESTA)
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.Case("highesta", VK_PPC_HIGHESTA)
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.Case("GOT@L", VK_PPC_GOT_LO)
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.Case("got@l", VK_PPC_GOT_LO)
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.Case("GOT@H", VK_PPC_GOT_HI)
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.Case("got@h", VK_PPC_GOT_HI)
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.Case("GOT@HA", VK_PPC_GOT_HA)
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.Case("got@ha", VK_PPC_GOT_HA)
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.Case("TOCBASE", VK_PPC_TOCBASE)
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.Case("tocbase", VK_PPC_TOCBASE)
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.Case("TOC", VK_PPC_TOC)
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.Case("toc", VK_PPC_TOC)
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.Case("TOC@L", VK_PPC_TOC_LO)
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.Case("toc@l", VK_PPC_TOC_LO)
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.Case("TOC@H", VK_PPC_TOC_HI)
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.Case("toc@h", VK_PPC_TOC_HI)
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.Case("TOC@HA", VK_PPC_TOC_HA)
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.Case("toc@ha", VK_PPC_TOC_HA)
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.Case("TLS", VK_PPC_TLS)
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.Case("tls", VK_PPC_TLS)
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.Case("DTPMOD", VK_PPC_DTPMOD)
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.Case("dtpmod", VK_PPC_DTPMOD)
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.Case("TPREL", VK_PPC_TPREL)
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.Case("tprel", VK_PPC_TPREL)
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.Case("TPREL@L", VK_PPC_TPREL_LO)
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.Case("tprel@l", VK_PPC_TPREL_LO)
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.Case("TPREL@H", VK_PPC_TPREL_HI)
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.Case("tprel@h", VK_PPC_TPREL_HI)
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.Case("TPREL@HA", VK_PPC_TPREL_HA)
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.Case("tprel@ha", VK_PPC_TPREL_HA)
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.Case("TPREL@HIGHER", VK_PPC_TPREL_HIGHER)
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.Case("tprel@higher", VK_PPC_TPREL_HIGHER)
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.Case("TPREL@HIGHERA", VK_PPC_TPREL_HIGHERA)
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.Case("tprel@highera", VK_PPC_TPREL_HIGHERA)
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.Case("TPREL@HIGHEST", VK_PPC_TPREL_HIGHEST)
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.Case("tprel@highest", VK_PPC_TPREL_HIGHEST)
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.Case("TPREL@HIGHESTA", VK_PPC_TPREL_HIGHESTA)
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.Case("tprel@highesta", VK_PPC_TPREL_HIGHESTA)
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.Case("DTPREL", VK_PPC_DTPREL)
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.Case("dtprel", VK_PPC_DTPREL)
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|
.Case("DTPREL@L", VK_PPC_DTPREL_LO)
|
|
.Case("dtprel@l", VK_PPC_DTPREL_LO)
|
|
.Case("DTPREL@H", VK_PPC_DTPREL_HI)
|
|
.Case("dtprel@h", VK_PPC_DTPREL_HI)
|
|
.Case("DTPREL@HA", VK_PPC_DTPREL_HA)
|
|
.Case("dtprel@ha", VK_PPC_DTPREL_HA)
|
|
.Case("DTPREL@HIGHER", VK_PPC_DTPREL_HIGHER)
|
|
.Case("dtprel@higher", VK_PPC_DTPREL_HIGHER)
|
|
.Case("DTPREL@HIGHERA", VK_PPC_DTPREL_HIGHERA)
|
|
.Case("dtprel@highera", VK_PPC_DTPREL_HIGHERA)
|
|
.Case("DTPREL@HIGHEST", VK_PPC_DTPREL_HIGHEST)
|
|
.Case("dtprel@highest", VK_PPC_DTPREL_HIGHEST)
|
|
.Case("DTPREL@HIGHESTA", VK_PPC_DTPREL_HIGHESTA)
|
|
.Case("dtprel@highesta", VK_PPC_DTPREL_HIGHESTA)
|
|
.Case("GOT@TPREL", VK_PPC_GOT_TPREL)
|
|
.Case("got@tprel", VK_PPC_GOT_TPREL)
|
|
.Case("GOT@TPREL@L", VK_PPC_GOT_TPREL_LO)
|
|
.Case("got@tprel@l", VK_PPC_GOT_TPREL_LO)
|
|
.Case("GOT@TPREL@H", VK_PPC_GOT_TPREL_HI)
|
|
.Case("got@tprel@h", VK_PPC_GOT_TPREL_HI)
|
|
.Case("GOT@TPREL@HA", VK_PPC_GOT_TPREL_HA)
|
|
.Case("got@tprel@ha", VK_PPC_GOT_TPREL_HA)
|
|
.Case("GOT@DTPREL", VK_PPC_GOT_DTPREL)
|
|
.Case("got@dtprel", VK_PPC_GOT_DTPREL)
|
|
.Case("GOT@DTPREL@L", VK_PPC_GOT_DTPREL_LO)
|
|
.Case("got@dtprel@l", VK_PPC_GOT_DTPREL_LO)
|
|
.Case("GOT@DTPREL@H", VK_PPC_GOT_DTPREL_HI)
|
|
.Case("got@dtprel@h", VK_PPC_GOT_DTPREL_HI)
|
|
.Case("GOT@DTPREL@HA", VK_PPC_GOT_DTPREL_HA)
|
|
.Case("got@dtprel@ha", VK_PPC_GOT_DTPREL_HA)
|
|
.Case("GOT@TLSGD", VK_PPC_GOT_TLSGD)
|
|
.Case("got@tlsgd", VK_PPC_GOT_TLSGD)
|
|
.Case("GOT@TLSGD@L", VK_PPC_GOT_TLSGD_LO)
|
|
.Case("got@tlsgd@l", VK_PPC_GOT_TLSGD_LO)
|
|
.Case("GOT@TLSGD@H", VK_PPC_GOT_TLSGD_HI)
|
|
.Case("got@tlsgd@h", VK_PPC_GOT_TLSGD_HI)
|
|
.Case("GOT@TLSGD@HA", VK_PPC_GOT_TLSGD_HA)
|
|
.Case("got@tlsgd@ha", VK_PPC_GOT_TLSGD_HA)
|
|
.Case("GOT@TLSLD", VK_PPC_GOT_TLSLD)
|
|
.Case("got@tlsld", VK_PPC_GOT_TLSLD)
|
|
.Case("GOT@TLSLD@L", VK_PPC_GOT_TLSLD_LO)
|
|
.Case("got@tlsld@l", VK_PPC_GOT_TLSLD_LO)
|
|
.Case("GOT@TLSLD@H", VK_PPC_GOT_TLSLD_HI)
|
|
.Case("got@tlsld@h", VK_PPC_GOT_TLSLD_HI)
|
|
.Case("GOT@TLSLD@HA", VK_PPC_GOT_TLSLD_HA)
|
|
.Case("got@tlsld@ha", VK_PPC_GOT_TLSLD_HA)
|
|
.Case("NONE", VK_ARM_NONE)
|
|
.Case("none", VK_ARM_NONE)
|
|
.Case("TARGET1", VK_ARM_TARGET1)
|
|
.Case("target1", VK_ARM_TARGET1)
|
|
.Case("TARGET2", VK_ARM_TARGET2)
|
|
.Case("target2", VK_ARM_TARGET2)
|
|
.Case("PREL31", VK_ARM_PREL31)
|
|
.Case("prel31", VK_ARM_PREL31)
|
|
.Case("TLSLDO", VK_ARM_TLSLDO)
|
|
.Case("tlsldo", VK_ARM_TLSLDO)
|
|
.Case("TLSCALL", VK_ARM_TLSCALL)
|
|
.Case("tlscall", VK_ARM_TLSCALL)
|
|
.Case("TLSDESC", VK_ARM_TLSDESC)
|
|
.Case("tlsdesc", VK_ARM_TLSDESC)
|
|
.Default(VK_Invalid);
|
|
}
|
|
|
|
/* *** */
|
|
|
|
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::EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
|
|
const MCAsmLayout *Layout,
|
|
const SectionAddrMap *Addrs) const {
|
|
MCValue Value;
|
|
|
|
// Fast path constants.
|
|
if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(this)) {
|
|
Res = CE->getValue();
|
|
return true;
|
|
}
|
|
|
|
// 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,
|
|
/*ForceVarExpansion*/ false);
|
|
|
|
// Record the current value.
|
|
Res = Value.getConstant();
|
|
|
|
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;
|
|
|
|
const MCSymbolData &AD = Asm->getSymbolData(SA);
|
|
const 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 = nullptr;
|
|
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 = 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;
|
|
|
|
Res = MCValue::get(A, B, Result_Cst);
|
|
return true;
|
|
}
|
|
|
|
bool MCExpr::EvaluateAsRelocatable(MCValue &Res,
|
|
const MCAsmLayout *Layout) const {
|
|
MCAssembler *Assembler = Layout ? &Layout->getAssembler() : nullptr;
|
|
return EvaluateAsRelocatableImpl(Res, Assembler, Layout, nullptr, false,
|
|
/*ForceVarExpansion*/ false);
|
|
}
|
|
|
|
bool MCExpr::EvaluateAsValue(MCValue &Res, const MCAsmLayout *Layout) const {
|
|
MCAssembler *Assembler = Layout ? &Layout->getAssembler() : nullptr;
|
|
return EvaluateAsRelocatableImpl(Res, Assembler, Layout, nullptr, false,
|
|
/*ForceVarExpansion*/ true);
|
|
}
|
|
|
|
bool MCExpr::EvaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
|
|
const MCAsmLayout *Layout,
|
|
const SectionAddrMap *Addrs, bool InSet,
|
|
bool ForceVarExpansion) const {
|
|
++stats::MCExprEvaluate;
|
|
|
|
switch (getKind()) {
|
|
case Target:
|
|
return cast<MCTargetExpr>(this)->EvaluateAsRelocatableImpl(Res, Layout);
|
|
|
|
case Constant:
|
|
Res = MCValue::get(cast<MCConstantExpr>(this)->getValue());
|
|
return true;
|
|
|
|
case SymbolRef: {
|
|
const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
|
|
bool IsWeakRef = SRE->getKind() == MCSymbolRefExpr::VK_WEAKREF;
|
|
const MCSymbol &Sym = SRE->getSymbol();
|
|
const MCAsmInfo &MCAsmInfo = SRE->getMCAsmInfo();
|
|
|
|
// Evaluate recursively if this is a variable.
|
|
if (Sym.isVariable() && !IsWeakRef) {
|
|
if (Sym.getVariableValue()->EvaluateAsRelocatableImpl(
|
|
Res, Asm, Layout, Addrs, true, ForceVarExpansion)) {
|
|
const MCSymbolRefExpr *A = Res.getSymA();
|
|
const MCSymbolRefExpr *B = Res.getSymB();
|
|
|
|
if (MCAsmInfo.hasSubsectionsViaSymbols()) {
|
|
// 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;
|
|
} else {
|
|
if (ForceVarExpansion)
|
|
return true;
|
|
bool IsSymbol = A && A->getSymbol().isDefined();
|
|
if (!IsSymbol)
|
|
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, Addrs,
|
|
InSet, ForceVarExpansion))
|
|
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;
|
|
Res = MCValue::get(Value.getSymB(), Value.getSymA(),
|
|
-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, Addrs,
|
|
InSet, ForceVarExpansion) ||
|
|
!ABE->getRHS()->EvaluateAsRelocatableImpl(RHSValue, Asm, Layout, Addrs,
|
|
InSet, ForceVarExpansion))
|
|
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.
|
|
return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
|
|
RHSValue.getSymB(), RHSValue.getSymA(),
|
|
-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 and right shifts
|
|
// differently from Apple as.
|
|
int64_t LHS = LHSValue.getConstant(), RHS = RHSValue.getConstant();
|
|
int64_t Result = 0;
|
|
switch (ABE->getOpcode()) {
|
|
case MCBinaryExpr::Add: Result = LHS + RHS; break;
|
|
case MCBinaryExpr::And: Result = LHS & RHS; break;
|
|
case MCBinaryExpr::Div: 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::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::Sub: Result = LHS - RHS; break;
|
|
case MCBinaryExpr::Xor: Result = LHS ^ RHS; break;
|
|
}
|
|
|
|
Res = MCValue::get(Result);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
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 nullptr;
|
|
}
|
|
|
|
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!");
|
|
}
|