forked from OSchip/llvm-project
104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
//===-- RISCVMCExpr.cpp - RISCV 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 RISCV architecture (e.g. ":lo12:", ":gottprel_g1:", ...).
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//
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//===----------------------------------------------------------------------===//
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#include "RISCV.h"
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#include "RISCVMCExpr.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/MCStreamer.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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#define DEBUG_TYPE "riscvmcexpr"
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const RISCVMCExpr *RISCVMCExpr::create(const MCExpr *Expr, VariantKind Kind,
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MCContext &Ctx) {
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return new (Ctx) RISCVMCExpr(Expr, Kind);
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}
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void RISCVMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
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bool HasVariant = getKind() != VK_RISCV_None;
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if (HasVariant)
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OS << '%' << getVariantKindName(getKind()) << '(';
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Expr->print(OS, MAI);
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if (HasVariant)
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OS << ')';
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}
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bool RISCVMCExpr::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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void RISCVMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
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Streamer.visitUsedExpr(*getSubExpr());
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}
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RISCVMCExpr::VariantKind RISCVMCExpr::getVariantKindForName(StringRef name) {
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return StringSwitch<RISCVMCExpr::VariantKind>(name)
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.Case("lo", VK_RISCV_LO)
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.Case("hi", VK_RISCV_HI)
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.Case("pcrel_lo", VK_RISCV_PCREL_LO)
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.Case("pcrel_hi", VK_RISCV_PCREL_HI)
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.Default(VK_RISCV_Invalid);
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}
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StringRef RISCVMCExpr::getVariantKindName(VariantKind Kind) {
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switch (Kind) {
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default:
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llvm_unreachable("Invalid ELF symbol kind");
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case VK_RISCV_LO:
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return "lo";
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case VK_RISCV_HI:
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return "hi";
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case VK_RISCV_PCREL_LO:
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return "pcrel_lo";
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case VK_RISCV_PCREL_HI:
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return "pcrel_hi";
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}
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}
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bool RISCVMCExpr::evaluateAsConstant(int64_t &Res) const {
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MCValue Value;
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if (Kind == VK_RISCV_PCREL_HI || Kind == VK_RISCV_PCREL_LO)
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return false;
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if (!getSubExpr()->evaluateAsRelocatable(Value, nullptr, nullptr))
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return false;
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if (!Value.isAbsolute())
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return false;
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Res = evaluateAsInt64(Value.getConstant());
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return true;
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}
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int64_t RISCVMCExpr::evaluateAsInt64(int64_t Value) const {
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switch (Kind) {
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default:
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llvm_unreachable("Invalid kind");
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case VK_RISCV_LO:
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return SignExtend64<12>(Value);
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case VK_RISCV_HI:
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// Add 1 if bit 11 is 1, to compensate for low 12 bits being negative.
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return ((Value + 0x800) >> 12) & 0xfffff;
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}
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}
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