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//===-- AVRMCAsmInfo.cpp - AVR asm properties -----------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations of the AVRMCAsmInfo properties.
//
//===----------------------------------------------------------------------===//
#include "AVRMCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCValue.h"
#include "llvm/TargetParser/Triple.h"
using namespace llvm;
AVRMCAsmInfo::AVRMCAsmInfo(const Triple &TT, const MCTargetOptions &Options) {
CodePointerSize = 2;
CalleeSaveStackSlotSize = 2;
CommentString = ";";
SeparatorString = "$";
UsesELFSectionDirectiveForBSS = true;
SupportsDebugInformation = true;
}
namespace {
const struct ModifierEntry {
const char *const Spelling;
AVRMCExpr::Specifier specifier;
} ModifierNames[] = {
{"lo8", AVR::S_LO8}, {"hi8", AVR::S_HI8},
{"hh8", AVR::S_HH8}, // synonym with hlo8
{"hlo8", AVR::S_HH8}, {"hhi8", AVR::S_HHI8},
{"pm", AVR::S_PM}, {"pm_lo8", AVR::S_PM_LO8},
{"pm_hi8", AVR::S_PM_HI8}, {"pm_hh8", AVR::S_PM_HH8},
{"lo8_gs", AVR::S_LO8_GS}, {"hi8_gs", AVR::S_HI8_GS},
{"gs", AVR::S_GS},
};
} // end of anonymous namespace
AVRMCExpr::Specifier AVRMCExpr::parseSpecifier(StringRef Name) {
const auto &Modifier =
llvm::find_if(ModifierNames, [&Name](ModifierEntry const &Mod) {
return Mod.Spelling == Name;
});
if (Modifier != std::end(ModifierNames)) {
return Modifier->specifier;
}
return AVR::S_AVR_NONE;
}
const char *AVRMCExpr::getName() const {
const auto &Modifier =
llvm::find_if(ModifierNames, [this](ModifierEntry const &Mod) {
return Mod.specifier == getSpecifier();
});
if (Modifier != std::end(ModifierNames)) {
return Modifier->Spelling;
}
return nullptr;
}
AVR::Fixups AVRMCExpr::getFixupKind() const {
AVR::Fixups Kind = AVR::Fixups::LastTargetFixupKind;
switch (getSpecifier()) {
case AVR::S_LO8:
Kind = isNegated() ? AVR::fixup_lo8_ldi_neg : AVR::fixup_lo8_ldi;
break;
case AVR::S_HI8:
Kind = isNegated() ? AVR::fixup_hi8_ldi_neg : AVR::fixup_hi8_ldi;
break;
case AVR::S_HH8:
Kind = isNegated() ? AVR::fixup_hh8_ldi_neg : AVR::fixup_hh8_ldi;
break;
case AVR::S_HHI8:
Kind = isNegated() ? AVR::fixup_ms8_ldi_neg : AVR::fixup_ms8_ldi;
break;
case AVR::S_PM_LO8:
Kind = isNegated() ? AVR::fixup_lo8_ldi_pm_neg : AVR::fixup_lo8_ldi_pm;
break;
case AVR::S_PM_HI8:
Kind = isNegated() ? AVR::fixup_hi8_ldi_pm_neg : AVR::fixup_hi8_ldi_pm;
break;
case AVR::S_PM_HH8:
Kind = isNegated() ? AVR::fixup_hh8_ldi_pm_neg : AVR::fixup_hh8_ldi_pm;
break;
case AVR::S_PM:
case AVR::S_GS:
Kind = AVR::fixup_16_pm;
break;
case AVR::S_LO8_GS:
Kind = AVR::fixup_lo8_ldi_gs;
break;
case AVR::S_HI8_GS:
Kind = AVR::fixup_hi8_ldi_gs;
break;
default:
llvm_unreachable("Uninitialized expression");
}
return Kind;
}
void AVRMCAsmInfo::printSpecifierExpr(raw_ostream &OS,
const MCSpecifierExpr &Expr) const {
auto &E = static_cast<const AVRMCExpr &>(Expr);
assert(E.getSpecifier() != AVR::S_AVR_NONE);
OS << E.getName() << '(';
if (E.isNegated())
OS << '-' << '(';
printExpr(OS, *E.getSubExpr());
if (E.isNegated())
OS << ')';
OS << ')';
}
int64_t AVRMCExpr::evaluateAsInt64(int64_t Value) const {
if (Negated)
Value *= -1;
switch (getSpecifier()) {
case AVR::S_LO8:
Value &= 0xff;
break;
case AVR::S_HI8:
Value &= 0xff00;
Value >>= 8;
break;
case AVR::S_HH8:
Value &= 0xff0000;
Value >>= 16;
break;
case AVR::S_HHI8:
Value &= 0xff000000;
Value >>= 24;
break;
case AVR::S_PM_LO8:
case AVR::S_LO8_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff;
break;
case AVR::S_PM_HI8:
case AVR::S_HI8_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff00;
Value >>= 8;
break;
case AVR::S_PM_HH8:
Value >>= 1; // Program memory addresses must always be shifted by one.
Value &= 0xff0000;
Value >>= 16;
break;
case AVR::S_PM:
case AVR::S_GS:
Value >>= 1; // Program memory addresses must always be shifted by one.
break;
case AVR::S_AVR_NONE:
default:
llvm_unreachable("Uninitialized expression.");
}
return static_cast<uint64_t>(Value) & 0xff;
}
// bool AVRMCExpr::evaluateAsRelocatableImpl(MCValue &Result,
// const MCAssembler *Asm) const {
bool AVRMCAsmInfo::evaluateAsRelocatableImpl(const MCSpecifierExpr &Expr,
MCValue &Result,
const MCAssembler *Asm) const {
auto &E = static_cast<const AVRMCExpr &>(Expr);
MCValue Value;
bool isRelocatable = E.getSubExpr()->evaluateAsRelocatable(Value, Asm);
if (!isRelocatable)
return false;
if (Value.isAbsolute()) {
Result = MCValue::get(E.evaluateAsInt64(Value.getConstant()));
} else {
if (!Asm || !Asm->hasLayout())
return false;
auto Spec = AVR::S_None;
if (Value.getSpecifier())
return false;
assert(!Value.getSubSym());
if (E.getSpecifier() == AVR::S_PM)
Spec = AVR::S_PM;
// TODO: don't attach specifier to MCSymbolRefExpr.
Result =
MCValue::get(Value.getAddSym(), nullptr, Value.getConstant(), Spec);
}
return true;
}
bool AVRMCExpr::evaluateAsConstant(int64_t &Result) const {
MCValue Value;
bool isRelocatable = getSubExpr()->evaluateAsRelocatable(Value, nullptr);
if (!isRelocatable)
return false;
if (Value.isAbsolute()) {
Result = evaluateAsInt64(Value.getConstant());
return true;
}
return false;
}
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