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| //===-- AVRMCExpr.cpp - AVR specific MC expression classes ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "AVRMCExpr.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCValue.h"
namespace llvm {
namespace {
const struct ModifierEntry {
const char * const Spelling;
AVRMCExpr::VariantKind VariantKind;
} ModifierNames[] = {
{"lo8", AVRMCExpr::VK_AVR_LO8}, {"hi8", AVRMCExpr::VK_AVR_HI8},
{"hh8", AVRMCExpr::VK_AVR_HH8}, // synonym with hlo8
{"hlo8", AVRMCExpr::VK_AVR_HH8}, {"hhi8", AVRMCExpr::VK_AVR_HHI8},
{"pm_lo8", AVRMCExpr::VK_AVR_PM_LO8}, {"pm_hi8", AVRMCExpr::VK_AVR_PM_HI8},
{"pm_hh8", AVRMCExpr::VK_AVR_PM_HH8},
{"lo8_gs", AVRMCExpr::VK_AVR_LO8_GS}, {"hi8_gs", AVRMCExpr::VK_AVR_HI8_GS},
{"gs", AVRMCExpr::VK_AVR_GS},
};
} // end of anonymous namespace
const AVRMCExpr *AVRMCExpr::create(VariantKind Kind, const MCExpr *Expr,
bool Negated, MCContext &Ctx) {
return new (Ctx) AVRMCExpr(Kind, Expr, Negated);
}
void AVRMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
assert(Kind != VK_AVR_None);
if (isNegated())
OS << '-';
OS << getName() << '(';
getSubExpr()->print(OS, MAI);
OS << ')';
}
bool AVRMCExpr::evaluateAsConstant(int64_t &Result) const {
MCValue Value;
bool isRelocatable =
getSubExpr()->evaluateAsRelocatable(Value, nullptr, nullptr);
if (!isRelocatable)
return false;
if (Value.isAbsolute()) {
Result = evaluateAsInt64(Value.getConstant());
return true;
}
return false;
}
bool AVRMCExpr::evaluateAsRelocatableImpl(MCValue &Result,
const MCAsmLayout *Layout,
const MCFixup *Fixup) const {
MCValue Value;
bool isRelocatable = SubExpr->evaluateAsRelocatable(Value, Layout, Fixup);
if (!isRelocatable)
return false;
if (Value.isAbsolute()) {
Result = MCValue::get(evaluateAsInt64(Value.getConstant()));
} else {
if (!Layout) return false;
MCContext &Context = Layout->getAssembler().getContext();
const MCSymbolRefExpr *Sym = Value.getSymA();
MCSymbolRefExpr::VariantKind Modifier = Sym->getKind();
if (Modifier != MCSymbolRefExpr::VK_None)
return false;
Sym = MCSymbolRefExpr::create(&Sym->getSymbol(), Modifier, Context);
Result = MCValue::get(Sym, Value.getSymB(), Value.getConstant());
}
return true;
}
int64_t AVRMCExpr::evaluateAsInt64(int64_t Value) const {
if (Negated)
Value *= -1;
switch (Kind) {
case AVRMCExpr::VK_AVR_LO8:
Value &= 0xff;
break;
case AVRMCExpr::VK_AVR_HI8:
Value &= 0xff00;
Value >>= 8;
break;
case AVRMCExpr::VK_AVR_HH8:
Value &= 0xff0000;
Value >>= 16;
break;
case AVRMCExpr::VK_AVR_HHI8:
Value &= 0xff000000;
Value >>= 24;
break;
case AVRMCExpr::VK_AVR_PM_LO8:
case AVRMCExpr::VK_AVR_LO8_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff;
break;
case AVRMCExpr::VK_AVR_PM_HI8:
case AVRMCExpr::VK_AVR_HI8_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff00;
Value >>= 8;
break;
case AVRMCExpr::VK_AVR_PM_HH8:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff0000;
Value >>= 16;
break;
case AVRMCExpr::VK_AVR_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
break;
case AVRMCExpr::VK_AVR_None:
llvm_unreachable("Uninitialized expression.");
}
return static_cast<uint64_t>(Value) & 0xff;
}
AVR::Fixups AVRMCExpr::getFixupKind() const {
AVR::Fixups Kind = AVR::Fixups::LastTargetFixupKind;
switch (getKind()) {
case VK_AVR_LO8:
Kind = isNegated() ? AVR::fixup_lo8_ldi_neg : AVR::fixup_lo8_ldi;
break;
case VK_AVR_HI8:
Kind = isNegated() ? AVR::fixup_hi8_ldi_neg : AVR::fixup_hi8_ldi;
break;
case VK_AVR_HH8:
Kind = isNegated() ? AVR::fixup_hh8_ldi_neg : AVR::fixup_hh8_ldi;
break;
case VK_AVR_HHI8:
Kind = isNegated() ? AVR::fixup_ms8_ldi_neg : AVR::fixup_ms8_ldi;
break;
case VK_AVR_PM_LO8:
Kind = isNegated() ? AVR::fixup_lo8_ldi_pm_neg : AVR::fixup_lo8_ldi_pm;
break;
case VK_AVR_PM_HI8:
Kind = isNegated() ? AVR::fixup_hi8_ldi_pm_neg : AVR::fixup_hi8_ldi_pm;
break;
case VK_AVR_PM_HH8:
Kind = isNegated() ? AVR::fixup_hh8_ldi_pm_neg : AVR::fixup_hh8_ldi_pm;
break;
case VK_AVR_GS:
Kind = AVR::fixup_16_pm;
break;
case VK_AVR_LO8_GS:
Kind = AVR::fixup_lo8_ldi_gs;
break;
case VK_AVR_HI8_GS:
Kind = AVR::fixup_hi8_ldi_gs;
break;
case VK_AVR_None:
llvm_unreachable("Uninitialized expression");
}
return Kind;
}
void AVRMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
Streamer.visitUsedExpr(*getSubExpr());
}
const char *AVRMCExpr::getName() const {
const auto &Modifier = std::find_if(
std::begin(ModifierNames), std::end(ModifierNames),
[this](ModifierEntry const &Mod) { return Mod.VariantKind == Kind; });
if (Modifier != std::end(ModifierNames)) {
return Modifier->Spelling;
}
return nullptr;
}
AVRMCExpr::VariantKind AVRMCExpr::getKindByName(StringRef Name) {
const auto &Modifier = std::find_if(
std::begin(ModifierNames), std::end(ModifierNames),
[&Name](ModifierEntry const &Mod) { return Mod.Spelling == Name; });
if (Modifier != std::end(ModifierNames)) {
return Modifier->VariantKind;
}
return VK_AVR_None;
}
} // end of namespace llvm
|