92 lines
4.4 KiB
C++
92 lines
4.4 KiB
C++
#include "lang/evaluator.hpp"
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namespace hex::lang {
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#define BUILTIN_FUNCTION(name) ASTNodeIntegerLiteral* Evaluator::name(std::vector<ASTNodeIntegerLiteral*> params)
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#define LITERAL_COMPARE(literal, cond) std::visit([&, this](auto &&literal) { return (cond) != 0; }, literal)
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BUILTIN_FUNCTION(findSequence) {
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auto& occurrenceIndex = params[0]->getValue();
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std::vector<u8> sequence;
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for (u32 i = 1; i < params.size(); i++) {
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sequence.push_back(std::visit([](auto &&value) -> u8 {
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if (value <= 0xFF)
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return value;
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else
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throwEvaluateError("sequence bytes need to fit into 1 byte", 1);
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}, params[i]->getValue()));
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}
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std::vector<u8> bytes(sequence.size(), 0x00);
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u32 occurrences = 0;
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for (u64 offset = 0; offset < this->m_provider->getSize() - sequence.size(); offset++) {
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this->m_provider->read(offset, bytes.data(), bytes.size());
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if (bytes == sequence) {
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if (LITERAL_COMPARE(occurrenceIndex, occurrenceIndex < occurrences)) {
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occurrences++;
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continue;
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}
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return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned64Bit, offset });
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}
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}
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throwEvaluateError("failed to find sequence", 1);
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}
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BUILTIN_FUNCTION(readUnsigned) {
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auto address = params[0]->getValue();
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auto size = params[1]->getValue();
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if (LITERAL_COMPARE(address, address >= this->m_provider->getActualSize()))
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throwEvaluateError("address out of range", 1);
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return std::visit([this](auto &&address, auto &&size) {
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if (size <= 0 || size > 16)
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throwEvaluateError("invalid read size", 1);
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u8 value[(u8)size];
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this->m_provider->read(address, value, size);
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switch ((u8)size) {
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case 1: return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned8Bit, hex::changeEndianess(*reinterpret_cast<u8*>(value), 1, this->getCurrentEndian()) });
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case 2: return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned16Bit, hex::changeEndianess(*reinterpret_cast<u16*>(value), 2, this->getCurrentEndian()) });
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case 4: return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned32Bit, hex::changeEndianess(*reinterpret_cast<u32*>(value), 4, this->getCurrentEndian()) });
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case 8: return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned64Bit, hex::changeEndianess(*reinterpret_cast<u64*>(value), 8, this->getCurrentEndian()) });
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case 16: return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned128Bit, hex::changeEndianess(*reinterpret_cast<u128*>(value), 16, this->getCurrentEndian()) });
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default: throwEvaluateError("invalid rvalue size", 1);
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}
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}, address, size);
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}
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BUILTIN_FUNCTION(readSigned) {
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auto address = params[0]->getValue();
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auto size = params[1]->getValue();
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if (LITERAL_COMPARE(address, address >= this->m_provider->getActualSize()))
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throwEvaluateError("address out of range", 1);
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return std::visit([this](auto &&address, auto &&size) {
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if (size <= 0 || size > 16)
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throwEvaluateError("invalid read size", 1);
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u8 value[(u8)size];
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this->m_provider->read(address, value, size);
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switch ((u8)size) {
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case 1: return new ASTNodeIntegerLiteral({ Token::ValueType::Signed8Bit, hex::changeEndianess(*reinterpret_cast<s8*>(value), 1, this->getCurrentEndian()) });
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case 2: return new ASTNodeIntegerLiteral({ Token::ValueType::Signed16Bit, hex::changeEndianess(*reinterpret_cast<s16*>(value), 2, this->getCurrentEndian()) });
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case 4: return new ASTNodeIntegerLiteral({ Token::ValueType::Signed32Bit, hex::changeEndianess(*reinterpret_cast<s32*>(value), 4, this->getCurrentEndian()) });
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case 8: return new ASTNodeIntegerLiteral({ Token::ValueType::Signed64Bit, hex::changeEndianess(*reinterpret_cast<s64*>(value), 8, this->getCurrentEndian()) });
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case 16: return new ASTNodeIntegerLiteral({ Token::ValueType::Signed128Bit, hex::changeEndianess(*reinterpret_cast<s128*>(value), 16, this->getCurrentEndian()) });
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default: throwEvaluateError("invalid rvalue size", 1);
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}
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}, address, size);
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}
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#undef BUILTIN_FUNCTION
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} |