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79ff112122
Global Dynamic and Local Dynamic call relocations only implicitly reference __tls_get_addr; there is no connection in the ELF file between the relocations and the symbol other than the specification for the relocations' semantics. However, it still needs to be in the symbol table despite the lack of explicit references to the symbol table entry, since it needs to be bound at link time for these relocations, otherwise any objects will fail to link. For details, see https://sourceware.org/bugzilla/show_bug.cgi?id=22832. Path by: James Clarke (jrtc27) Differential revision: https://reviews.llvm.org/D43271 llvm-svn: 325688
233 lines
8.8 KiB
C++
233 lines
8.8 KiB
C++
//===-- SparcMCExpr.cpp - Sparc specific MC expression classes --------===//
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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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//
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// This file contains the implementation of the assembly expression modifiers
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// accepted by the Sparc architecture (e.g. "%hi", "%lo", ...).
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//
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//===----------------------------------------------------------------------===//
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#include "SparcMCExpr.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/MCObjectStreamer.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/Object/ELF.h"
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using namespace llvm;
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#define DEBUG_TYPE "sparcmcexpr"
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const SparcMCExpr*
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SparcMCExpr::create(VariantKind Kind, const MCExpr *Expr,
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MCContext &Ctx) {
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return new (Ctx) SparcMCExpr(Kind, Expr);
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}
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void SparcMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
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bool closeParen = printVariantKind(OS, Kind);
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const MCExpr *Expr = getSubExpr();
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Expr->print(OS, MAI);
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if (closeParen)
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OS << ')';
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}
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bool SparcMCExpr::printVariantKind(raw_ostream &OS, VariantKind Kind)
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{
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bool closeParen = true;
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switch (Kind) {
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case VK_Sparc_None: closeParen = false; break;
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case VK_Sparc_LO: OS << "%lo("; break;
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case VK_Sparc_HI: OS << "%hi("; break;
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case VK_Sparc_H44: OS << "%h44("; break;
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case VK_Sparc_M44: OS << "%m44("; break;
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case VK_Sparc_L44: OS << "%l44("; break;
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case VK_Sparc_HH: OS << "%hh("; break;
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case VK_Sparc_HM: OS << "%hm("; break;
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// FIXME: use %pc22/%pc10, if system assembler supports them.
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case VK_Sparc_PC22: OS << "%hi("; break;
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case VK_Sparc_PC10: OS << "%lo("; break;
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// FIXME: use %got22/%got10, if system assembler supports them.
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case VK_Sparc_GOT22: OS << "%hi("; break;
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case VK_Sparc_GOT10: OS << "%lo("; break;
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case VK_Sparc_WPLT30: closeParen = false; break;
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case VK_Sparc_R_DISP32: OS << "%r_disp32("; break;
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case VK_Sparc_TLS_GD_HI22: OS << "%tgd_hi22("; break;
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case VK_Sparc_TLS_GD_LO10: OS << "%tgd_lo10("; break;
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case VK_Sparc_TLS_GD_ADD: OS << "%tgd_add("; break;
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case VK_Sparc_TLS_GD_CALL: OS << "%tgd_call("; break;
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case VK_Sparc_TLS_LDM_HI22: OS << "%tldm_hi22("; break;
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case VK_Sparc_TLS_LDM_LO10: OS << "%tldm_lo10("; break;
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case VK_Sparc_TLS_LDM_ADD: OS << "%tldm_add("; break;
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case VK_Sparc_TLS_LDM_CALL: OS << "%tldm_call("; break;
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case VK_Sparc_TLS_LDO_HIX22: OS << "%tldo_hix22("; break;
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case VK_Sparc_TLS_LDO_LOX10: OS << "%tldo_lox10("; break;
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case VK_Sparc_TLS_LDO_ADD: OS << "%tldo_add("; break;
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case VK_Sparc_TLS_IE_HI22: OS << "%tie_hi22("; break;
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case VK_Sparc_TLS_IE_LO10: OS << "%tie_lo10("; break;
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case VK_Sparc_TLS_IE_LD: OS << "%tie_ld("; break;
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case VK_Sparc_TLS_IE_LDX: OS << "%tie_ldx("; break;
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case VK_Sparc_TLS_IE_ADD: OS << "%tie_add("; break;
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case VK_Sparc_TLS_LE_HIX22: OS << "%tle_hix22("; break;
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case VK_Sparc_TLS_LE_LOX10: OS << "%tle_lox10("; break;
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}
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return closeParen;
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}
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SparcMCExpr::VariantKind SparcMCExpr::parseVariantKind(StringRef name)
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{
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return StringSwitch<SparcMCExpr::VariantKind>(name)
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.Case("lo", VK_Sparc_LO)
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.Case("hi", VK_Sparc_HI)
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.Case("h44", VK_Sparc_H44)
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.Case("m44", VK_Sparc_M44)
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.Case("l44", VK_Sparc_L44)
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.Case("hh", VK_Sparc_HH)
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.Case("hm", VK_Sparc_HM)
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.Case("pc22", VK_Sparc_PC22)
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.Case("pc10", VK_Sparc_PC10)
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.Case("got22", VK_Sparc_GOT22)
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.Case("got10", VK_Sparc_GOT10)
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.Case("r_disp32", VK_Sparc_R_DISP32)
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.Case("tgd_hi22", VK_Sparc_TLS_GD_HI22)
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.Case("tgd_lo10", VK_Sparc_TLS_GD_LO10)
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.Case("tgd_add", VK_Sparc_TLS_GD_ADD)
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.Case("tgd_call", VK_Sparc_TLS_GD_CALL)
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.Case("tldm_hi22", VK_Sparc_TLS_LDM_HI22)
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.Case("tldm_lo10", VK_Sparc_TLS_LDM_LO10)
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.Case("tldm_add", VK_Sparc_TLS_LDM_ADD)
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.Case("tldm_call", VK_Sparc_TLS_LDM_CALL)
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.Case("tldo_hix22", VK_Sparc_TLS_LDO_HIX22)
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.Case("tldo_lox10", VK_Sparc_TLS_LDO_LOX10)
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.Case("tldo_add", VK_Sparc_TLS_LDO_ADD)
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.Case("tie_hi22", VK_Sparc_TLS_IE_HI22)
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.Case("tie_lo10", VK_Sparc_TLS_IE_LO10)
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.Case("tie_ld", VK_Sparc_TLS_IE_LD)
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.Case("tie_ldx", VK_Sparc_TLS_IE_LDX)
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.Case("tie_add", VK_Sparc_TLS_IE_ADD)
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.Case("tle_hix22", VK_Sparc_TLS_LE_HIX22)
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.Case("tle_lox10", VK_Sparc_TLS_LE_LOX10)
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.Default(VK_Sparc_None);
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}
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Sparc::Fixups SparcMCExpr::getFixupKind(SparcMCExpr::VariantKind Kind) {
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switch (Kind) {
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default: llvm_unreachable("Unhandled SparcMCExpr::VariantKind");
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case VK_Sparc_LO: return Sparc::fixup_sparc_lo10;
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case VK_Sparc_HI: return Sparc::fixup_sparc_hi22;
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case VK_Sparc_H44: return Sparc::fixup_sparc_h44;
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case VK_Sparc_M44: return Sparc::fixup_sparc_m44;
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case VK_Sparc_L44: return Sparc::fixup_sparc_l44;
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case VK_Sparc_HH: return Sparc::fixup_sparc_hh;
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case VK_Sparc_HM: return Sparc::fixup_sparc_hm;
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case VK_Sparc_PC22: return Sparc::fixup_sparc_pc22;
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case VK_Sparc_PC10: return Sparc::fixup_sparc_pc10;
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case VK_Sparc_GOT22: return Sparc::fixup_sparc_got22;
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case VK_Sparc_GOT10: return Sparc::fixup_sparc_got10;
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case VK_Sparc_WPLT30: return Sparc::fixup_sparc_wplt30;
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case VK_Sparc_TLS_GD_HI22: return Sparc::fixup_sparc_tls_gd_hi22;
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case VK_Sparc_TLS_GD_LO10: return Sparc::fixup_sparc_tls_gd_lo10;
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case VK_Sparc_TLS_GD_ADD: return Sparc::fixup_sparc_tls_gd_add;
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case VK_Sparc_TLS_GD_CALL: return Sparc::fixup_sparc_tls_gd_call;
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case VK_Sparc_TLS_LDM_HI22: return Sparc::fixup_sparc_tls_ldm_hi22;
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case VK_Sparc_TLS_LDM_LO10: return Sparc::fixup_sparc_tls_ldm_lo10;
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case VK_Sparc_TLS_LDM_ADD: return Sparc::fixup_sparc_tls_ldm_add;
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case VK_Sparc_TLS_LDM_CALL: return Sparc::fixup_sparc_tls_ldm_call;
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case VK_Sparc_TLS_LDO_HIX22: return Sparc::fixup_sparc_tls_ldo_hix22;
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case VK_Sparc_TLS_LDO_LOX10: return Sparc::fixup_sparc_tls_ldo_lox10;
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case VK_Sparc_TLS_LDO_ADD: return Sparc::fixup_sparc_tls_ldo_add;
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case VK_Sparc_TLS_IE_HI22: return Sparc::fixup_sparc_tls_ie_hi22;
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case VK_Sparc_TLS_IE_LO10: return Sparc::fixup_sparc_tls_ie_lo10;
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case VK_Sparc_TLS_IE_LD: return Sparc::fixup_sparc_tls_ie_ld;
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case VK_Sparc_TLS_IE_LDX: return Sparc::fixup_sparc_tls_ie_ldx;
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case VK_Sparc_TLS_IE_ADD: return Sparc::fixup_sparc_tls_ie_add;
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case VK_Sparc_TLS_LE_HIX22: return Sparc::fixup_sparc_tls_le_hix22;
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case VK_Sparc_TLS_LE_LOX10: return Sparc::fixup_sparc_tls_le_lox10;
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}
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}
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bool
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SparcMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
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const MCAsmLayout *Layout,
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const MCFixup *Fixup) const {
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return getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup);
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}
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static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
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switch (Expr->getKind()) {
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case MCExpr::Target:
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llvm_unreachable("Can't handle nested target expr!");
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break;
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case MCExpr::Constant:
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break;
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case MCExpr::Binary: {
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const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
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fixELFSymbolsInTLSFixupsImpl(BE->getLHS(), Asm);
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fixELFSymbolsInTLSFixupsImpl(BE->getRHS(), Asm);
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break;
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}
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case MCExpr::SymbolRef: {
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const MCSymbolRefExpr &SymRef = *cast<MCSymbolRefExpr>(Expr);
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cast<MCSymbolELF>(SymRef.getSymbol()).setType(ELF::STT_TLS);
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break;
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}
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case MCExpr::Unary:
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fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
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break;
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}
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}
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void SparcMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
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switch(getKind()) {
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default: return;
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case VK_Sparc_TLS_GD_CALL:
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case VK_Sparc_TLS_LDM_CALL: {
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// The corresponding relocations reference __tls_get_addr, as they call it,
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// but this is only implicit; we must explicitly add it to our symbol table
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// to bind it for these uses.
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MCSymbol *Symbol = Asm.getContext().getOrCreateSymbol("__tls_get_addr");
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Asm.registerSymbol(*Symbol);
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auto ELFSymbol = cast<MCSymbolELF>(Symbol);
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if (!ELFSymbol->isBindingSet()) {
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ELFSymbol->setBinding(ELF::STB_GLOBAL);
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ELFSymbol->setExternal(true);
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}
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LLVM_FALLTHROUGH;
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}
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case VK_Sparc_TLS_GD_HI22:
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case VK_Sparc_TLS_GD_LO10:
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case VK_Sparc_TLS_GD_ADD:
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case VK_Sparc_TLS_LDM_HI22:
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case VK_Sparc_TLS_LDM_LO10:
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case VK_Sparc_TLS_LDM_ADD:
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case VK_Sparc_TLS_LDO_HIX22:
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case VK_Sparc_TLS_LDO_LOX10:
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case VK_Sparc_TLS_LDO_ADD:
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case VK_Sparc_TLS_IE_HI22:
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case VK_Sparc_TLS_IE_LO10:
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case VK_Sparc_TLS_IE_LD:
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case VK_Sparc_TLS_IE_LDX:
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case VK_Sparc_TLS_IE_ADD:
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case VK_Sparc_TLS_LE_HIX22:
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case VK_Sparc_TLS_LE_LOX10: break;
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}
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fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
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}
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void SparcMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
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Streamer.visitUsedExpr(*getSubExpr());
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}
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