LCOV - code coverage report
Current view: top level - lib/Target/AArch64/MCTargetDesc - AArch64MCExpr.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 68 77 88.3 %
Date: 2018-06-17 00:07:59 Functions: 7 8 87.5 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===-- AArch64MCExpr.cpp - AArch64 specific MC expression classes --------===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file contains the implementation of the assembly expression modifiers
      11             : // accepted by the AArch64 architecture (e.g. ":lo12:", ":gottprel_g1:", ...).
      12             : //
      13             : //===----------------------------------------------------------------------===//
      14             : 
      15             : #include "AArch64MCExpr.h"
      16             : #include "llvm/MC/MCContext.h"
      17             : #include "llvm/MC/MCStreamer.h"
      18             : #include "llvm/MC/MCSymbolELF.h"
      19             : #include "llvm/MC/MCValue.h"
      20             : #include "llvm/Object/ELF.h"
      21             : #include "llvm/Support/ErrorHandling.h"
      22             : 
      23             : using namespace llvm;
      24             : 
      25             : #define DEBUG_TYPE "aarch64symbolrefexpr"
      26             : 
      27        8744 : const AArch64MCExpr *AArch64MCExpr::create(const MCExpr *Expr, VariantKind Kind,
      28             :                                        MCContext &Ctx) {
      29        8744 :   return new (Ctx) AArch64MCExpr(Expr, Kind);
      30             : }
      31             : 
      32        8286 : StringRef AArch64MCExpr::getVariantKindName() const {
      33        8286 :   switch (static_cast<uint32_t>(getKind())) {
      34        1383 :   case VK_CALL:                return "";
      35        3219 :   case VK_LO12:                return ":lo12:";
      36          40 :   case VK_ABS_G3:              return ":abs_g3:";
      37           5 :   case VK_ABS_G2:              return ":abs_g2:";
      38           4 :   case VK_ABS_G2_S:            return ":abs_g2_s:";
      39          37 :   case VK_ABS_G2_NC:           return ":abs_g2_nc:";
      40           5 :   case VK_ABS_G1:              return ":abs_g1:";
      41           8 :   case VK_ABS_G1_S:            return ":abs_g1_s:";
      42          37 :   case VK_ABS_G1_NC:           return ":abs_g1_nc:";
      43           5 :   case VK_ABS_G0:              return ":abs_g0:";
      44           8 :   case VK_ABS_G0_S:            return ":abs_g0_s:";
      45          37 :   case VK_ABS_G0_NC:           return ":abs_g0_nc:";
      46          12 :   case VK_DTPREL_G2:           return ":dtprel_g2:";
      47          14 :   case VK_DTPREL_G1:           return ":dtprel_g1:";
      48           8 :   case VK_DTPREL_G1_NC:        return ":dtprel_g1_nc:";
      49          14 :   case VK_DTPREL_G0:           return ":dtprel_g0:";
      50           8 :   case VK_DTPREL_G0_NC:        return ":dtprel_g0_nc:";
      51           8 :   case VK_DTPREL_HI12:         return ":dtprel_hi12:";
      52          78 :   case VK_DTPREL_LO12:         return ":dtprel_lo12:";
      53          88 :   case VK_DTPREL_LO12_NC:      return ":dtprel_lo12_nc:";
      54           8 :   case VK_TPREL_G2:            return ":tprel_g2:";
      55          14 :   case VK_TPREL_G1:            return ":tprel_g1:";
      56           8 :   case VK_TPREL_G1_NC:         return ":tprel_g1_nc:";
      57          14 :   case VK_TPREL_G0:            return ":tprel_g0:";
      58           8 :   case VK_TPREL_G0_NC:         return ":tprel_g0_nc:";
      59           8 :   case VK_TPREL_HI12:          return ":tprel_hi12:";
      60          78 :   case VK_TPREL_LO12:          return ":tprel_lo12:";
      61          88 :   case VK_TPREL_LO12_NC:       return ":tprel_lo12_nc:";
      62          58 :   case VK_TLSDESC_LO12:        return ":tlsdesc_lo12:";
      63        2734 :   case VK_ABS_PAGE:            return "";
      64           0 :   case VK_ABS_PAGE_NC:         return ":pg_hi21_nc:";
      65          72 :   case VK_GOT_PAGE:            return ":got:";
      66          78 :   case VK_GOT_LO12:            return ":got_lo12:";
      67          18 :   case VK_GOTTPREL_PAGE:       return ":gottprel:";
      68          20 :   case VK_GOTTPREL_LO12_NC:    return ":gottprel_lo12:";
      69           6 :   case VK_GOTTPREL_G1:         return ":gottprel_g1:";
      70           6 :   case VK_GOTTPREL_G0_NC:      return ":gottprel_g0_nc:";
      71          17 :   case VK_TLSDESC:             return "";
      72          23 :   case VK_TLSDESC_PAGE:        return ":tlsdesc:";
      73           5 :   case VK_SECREL_LO12:         return ":secrel_lo12:";
      74           5 :   case VK_SECREL_HI12:         return ":secrel_hi12:";
      75           0 :   default:
      76           0 :     llvm_unreachable("Invalid ELF symbol kind");
      77             :   }
      78             : }
      79             : 
      80        8354 : void AArch64MCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
      81        8354 :   if (getKind() != VK_NONE)
      82        8286 :     OS << getVariantKindName();
      83        8354 :   Expr->print(OS, MAI);
      84        8354 : }
      85             : 
      86         703 : void AArch64MCExpr::visitUsedExpr(MCStreamer &Streamer) const {
      87         703 :   Streamer.visitUsedExpr(*getSubExpr());
      88         703 : }
      89             : 
      90           0 : MCFragment *AArch64MCExpr::findAssociatedFragment() const {
      91           0 :   llvm_unreachable("FIXME: what goes here?");
      92             : }
      93             : 
      94         703 : bool AArch64MCExpr::evaluateAsRelocatableImpl(MCValue &Res,
      95             :                                               const MCAsmLayout *Layout,
      96             :                                               const MCFixup *Fixup) const {
      97         703 :   if (!getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup))
      98             :     return false;
      99             : 
     100         703 :   Res =
     101         703 :       MCValue::get(Res.getSymA(), Res.getSymB(), Res.getConstant(), getKind());
     102             : 
     103         703 :   return true;
     104             : }
     105             : 
     106         364 : static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
     107         374 :   switch (Expr->getKind()) {
     108           0 :   case MCExpr::Target:
     109           0 :     llvm_unreachable("Can't handle nested target expression");
     110             :     break;
     111             :   case MCExpr::Constant:
     112             :     break;
     113             : 
     114             :   case MCExpr::Binary: {
     115             :     const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
     116          10 :     fixELFSymbolsInTLSFixupsImpl(BE->getLHS(), Asm);
     117          10 :     fixELFSymbolsInTLSFixupsImpl(BE->getRHS(), Asm);
     118          10 :     break;
     119             :   }
     120             : 
     121             :   case MCExpr::SymbolRef: {
     122             :     // We're known to be under a TLS fixup, so any symbol should be
     123             :     // modified. There should be only one.
     124             :     const MCSymbolRefExpr &SymRef = *cast<MCSymbolRefExpr>(Expr);
     125         354 :     cast<MCSymbolELF>(SymRef.getSymbol()).setType(ELF::STT_TLS);
     126         354 :     break;
     127             :   }
     128             : 
     129             :   case MCExpr::Unary:
     130           0 :     fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
     131           0 :     break;
     132             :   }
     133         364 : }
     134             : 
     135         691 : void AArch64MCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
     136        1382 :   switch (getSymbolLoc(Kind)) {
     137             :   default:
     138             :     return;
     139             :   case VK_DTPREL:
     140             :   case VK_GOTTPREL:
     141             :   case VK_TPREL:
     142             :   case VK_TLSDESC:
     143             :     break;
     144             :   }
     145             : 
     146         354 :   fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
     147             : }

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