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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/MC/MCInstPrinter.h"
#include "rcc/MC/MCExpr.h"
#include <cctype>
#include <cstddef>
#include <cstdint>
#include <string>
#include <string_view>
namespace rcc::mc {
namespace {
[[nodiscard]] bool isBareSymbolName(std::string_view Name) noexcept {
if (Name.empty())
return false;
const auto Initial = [](unsigned char Character) {
return std::isalpha(Character) != 0 || Character == '_' || Character == '.' || Character == '$';
};
const auto Following = [](unsigned char Character) {
return std::isalnum(Character) != 0 || Character == '_' || Character == '.' || Character == '$';
};
if (!Initial(static_cast<unsigned char>(Name.front())))
return false;
for (const char Character : Name.substr(1)) {
if (!Following(static_cast<unsigned char>(Character)))
return false;
}
return true;
}
[[nodiscard]] std::string_view unarySpelling(MCUnaryOperator Operator) noexcept {
switch (Operator) {
case MCUnaryOperator::Plus:
return "+";
case MCUnaryOperator::Minus:
return "-";
case MCUnaryOperator::BitwiseNot:
return "~";
case MCUnaryOperator::LogicalNot:
return "!";
}
return {};
}
[[nodiscard]] std::string_view binarySpelling(MCBinaryOperator Operator) noexcept {
switch (Operator) {
case MCBinaryOperator::Add:
return "+";
case MCBinaryOperator::Subtract:
return "-";
case MCBinaryOperator::Multiply:
return "*";
case MCBinaryOperator::Divide:
return "/";
case MCBinaryOperator::Modulo:
return "%";
case MCBinaryOperator::ShiftLeft:
return "<<";
case MCBinaryOperator::ShiftRight:
return ">>";
case MCBinaryOperator::BitwiseAnd:
return "&";
case MCBinaryOperator::BitwiseOr:
return "|";
case MCBinaryOperator::BitwiseXor:
return "^";
case MCBinaryOperator::LogicalAnd:
return "&&";
case MCBinaryOperator::LogicalOr:
return "||";
case MCBinaryOperator::Equal:
return "==";
case MCBinaryOperator::NotEqual:
return "!=";
case MCBinaryOperator::Less:
return "<";
case MCBinaryOperator::LessEqual:
return "<=";
case MCBinaryOperator::Greater:
return ">";
case MCBinaryOperator::GreaterEqual:
return ">=";
}
return {};
}
[[nodiscard]] Expected<std::string>
printExpressionImpl(const MCExpr &Expression, const MCInstPrinter &Printer, std::size_t Depth) {
if (Depth > 256)
return makeUnexpected(ErrorCode::AssemblyLoweringFailed,
"MC expression exceeds the assembly printing depth limit");
switch (Expression.kind()) {
case MCExpr::Kind::Constant:
return std::to_string(*Expression.getIf<std::int64_t>());
case MCExpr::Kind::SymbolRef: {
const auto *Reference = Expression.getIf<MCSymbolRefExpr>();
if (Reference == nullptr || !Reference->Symbol)
return makeUnexpected(ErrorCode::InternalError, "MC symbol expression storage is invalid");
return printMCSymbolName(Reference->Symbol->name());
}
case MCExpr::Kind::Unary: {
const auto *Unary = Expression.getIf<MCUnaryExpr>();
if (Unary == nullptr || !Unary->Operand)
return makeUnexpected(ErrorCode::InternalError, "MC unary expression storage is invalid");
auto Operand = printExpressionImpl(*Unary->Operand, Printer, Depth + 1);
if (!Operand)
return std::unexpected(Operand.error());
return std::string(unarySpelling(Unary->Operator)) + "(" + *Operand + ")";
}
case MCExpr::Kind::Binary: {
const auto *Binary = Expression.getIf<MCBinaryExpr>();
if (Binary == nullptr || !Binary->Left || !Binary->Right)
return makeUnexpected(ErrorCode::InternalError, "MC binary expression storage is invalid");
auto Left = printExpressionImpl(*Binary->Left, Printer, Depth + 1);
if (!Left)
return std::unexpected(Left.error());
auto Right = printExpressionImpl(*Binary->Right, Printer, Depth + 1);
if (!Right)
return std::unexpected(Right.error());
return "(" + *Left + std::string(binarySpelling(Binary->Operator)) + *Right + ")";
}
case MCExpr::Kind::Target: {
const auto *Target = Expression.getIf<MCTargetExpr>();
if (Target == nullptr || !Target->Operand)
return makeUnexpected(ErrorCode::InternalError, "target MC expression storage is invalid");
auto Operand = printExpressionImpl(*Target->Operand, Printer, Depth + 1);
if (!Operand)
return std::unexpected(Operand.error());
return Printer.printTargetExpression(Target->Kind, *Operand);
}
}
return makeUnexpected(ErrorCode::InternalError, "MC expression kind is invalid");
}
} // namespace
Expected<std::string> printMCSymbolName(std::string_view Name) {
if (Name.empty())
return makeUnexpected(ErrorCode::AssemblyLoweringFailed, "MC symbol name cannot be empty");
if (isBareSymbolName(Name))
return std::string(Name);
std::string Result;
Result.push_back('"');
for (const char RawCharacter : Name) {
const auto Character = static_cast<unsigned char>(RawCharacter);
if (Character == 0 || Character == '\n' || Character == '\r' || Character == 0x7fU) {
return makeUnexpected(ErrorCode::AssemblyLoweringFailed,
"MC symbol name contains a non-printable character");
}
if (Character == '"' || Character == '\\')
Result.push_back('\\');
Result.push_back(static_cast<char>(Character));
}
Result.push_back('"');
return Result;
}
Expected<std::string> printMCExpression(const MCExpr &Expression, const MCInstPrinter &Printer) {
auto Verification = Expression.verify();
if (!Verification)
return std::unexpected(Verification.error());
return printExpressionImpl(Expression, Printer, 1);
}
} // namespace rcc::mc
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