1 //===-- ARM64MCExpr.cpp - ARM64 specific MC expression classes --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the implementation of the assembly expression modifiers
11 // accepted by the AArch64 architecture (e.g. ":lo12:", ":gottprel_g1:", ...).
13 //===----------------------------------------------------------------------===//
15 #include "ARM64MCExpr.h"
16 #include "llvm/MC/MCAssembler.h"
17 #include "llvm/MC/MCContext.h"
18 #include "llvm/MC/MCELF.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/MC/MCValue.h"
21 #include "llvm/Object/ELF.h"
22 #include "llvm/Support/ErrorHandling.h"
26 #define DEBUG_TYPE "aarch64symbolrefexpr"
28 const ARM64MCExpr *ARM64MCExpr::Create(const MCExpr *Expr, VariantKind Kind,
30 return new (Ctx) ARM64MCExpr(Expr, Kind);
33 StringRef ARM64MCExpr::getVariantKindName() const {
34 switch (static_cast<uint32_t>(getKind())) {
35 case VK_CALL: return "";
36 case VK_LO12: return ":lo12:";
37 case VK_ABS_G3: return ":abs_g3:";
38 case VK_ABS_G2: return ":abs_g2:";
39 case VK_ABS_G2_S: return ":abs_g2_s:";
40 case VK_ABS_G2_NC: return ":abs_g2_nc:";
41 case VK_ABS_G1: return ":abs_g1:";
42 case VK_ABS_G1_S: return ":abs_g1_s:";
43 case VK_ABS_G1_NC: return ":abs_g1_nc:";
44 case VK_ABS_G0: return ":abs_g0:";
45 case VK_ABS_G0_S: return ":abs_g0_s:";
46 case VK_ABS_G0_NC: return ":abs_g0_nc:";
47 case VK_DTPREL_G2: return ":dtprel_g2:";
48 case VK_DTPREL_G1: return ":dtprel_g1:";
49 case VK_DTPREL_G1_NC: return ":dtprel_g1_nc:";
50 case VK_DTPREL_G0: return ":dtprel_g0:";
51 case VK_DTPREL_G0_NC: return ":dtprel_g0_nc:";
52 case VK_DTPREL_HI12: return ":dtprel_hi12:";
53 case VK_DTPREL_LO12: return ":dtprel_lo12:";
54 case VK_DTPREL_LO12_NC: return ":dtprel_lo12_nc:";
55 case VK_TPREL_G2: return ":tprel_g2:";
56 case VK_TPREL_G1: return ":tprel_g1:";
57 case VK_TPREL_G1_NC: return ":tprel_g1_nc:";
58 case VK_TPREL_G0: return ":tprel_g0:";
59 case VK_TPREL_G0_NC: return ":tprel_g0_nc:";
60 case VK_TPREL_HI12: return ":tprel_hi12:";
61 case VK_TPREL_LO12: return ":tprel_lo12:";
62 case VK_TPREL_LO12_NC: return ":tprel_lo12_nc:";
63 case VK_TLSDESC_LO12: return ":tlsdesc_lo12:";
64 case VK_ABS_PAGE: return "";
65 case VK_GOT_PAGE: return ":got:";
66 case VK_GOT_LO12: return ":got_lo12:";
67 case VK_GOTTPREL_PAGE: return ":gottprel:";
68 case VK_GOTTPREL_LO12_NC: return ":gottprel_lo12:";
69 case VK_GOTTPREL_G1: return ":gottprel_g1:";
70 case VK_GOTTPREL_G0_NC: return ":gottprel_g0_nc:";
71 case VK_TLSDESC: return "";
72 case VK_TLSDESC_PAGE: return ":tlsdesc:";
74 llvm_unreachable("Invalid ELF symbol kind");
78 void ARM64MCExpr::PrintImpl(raw_ostream &OS) const {
79 if (getKind() != VK_NONE)
80 OS << getVariantKindName();
84 // FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
85 // that method should be made public?
86 // FIXME: really do above: now that two backends are using it.
87 static void AddValueSymbolsImpl(const MCExpr *Value, MCAssembler *Asm) {
88 switch (Value->getKind()) {
90 llvm_unreachable("Can't handle nested target expr!");
93 case MCExpr::Constant:
96 case MCExpr::Binary: {
97 const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
98 AddValueSymbolsImpl(BE->getLHS(), Asm);
99 AddValueSymbolsImpl(BE->getRHS(), Asm);
103 case MCExpr::SymbolRef:
104 Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
108 AddValueSymbolsImpl(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
113 void ARM64MCExpr::AddValueSymbols(MCAssembler *Asm) const {
114 AddValueSymbolsImpl(getSubExpr(), Asm);
117 const MCSection *ARM64MCExpr::FindAssociatedSection() const {
118 llvm_unreachable("FIXME: what goes here?");
121 bool ARM64MCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
122 const MCAsmLayout *Layout) const {
123 if (!getSubExpr()->EvaluateAsRelocatable(Res, Layout))
127 MCValue::get(Res.getSymA(), Res.getSymB(), Res.getConstant(), getKind());
132 static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
133 switch (Expr->getKind()) {
135 llvm_unreachable("Can't handle nested target expression");
137 case MCExpr::Constant:
140 case MCExpr::Binary: {
141 const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
142 fixELFSymbolsInTLSFixupsImpl(BE->getLHS(), Asm);
143 fixELFSymbolsInTLSFixupsImpl(BE->getRHS(), Asm);
147 case MCExpr::SymbolRef: {
148 // We're known to be under a TLS fixup, so any symbol should be
149 // modified. There should be only one.
150 const MCSymbolRefExpr &SymRef = *cast<MCSymbolRefExpr>(Expr);
151 MCSymbolData &SD = Asm.getOrCreateSymbolData(SymRef.getSymbol());
152 MCELF::SetType(SD, ELF::STT_TLS);
157 fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
162 void ARM64MCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
163 switch (getSymbolLoc(Kind)) {
173 fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);