234 lines
11 KiB
C++
234 lines
11 KiB
C++
#include <hex/pattern_language/evaluator.hpp>
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#include <hex/pattern_language/ast_node.hpp>
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#include <hex/pattern_language/pattern_data.hpp>
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namespace hex::pl {
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void Evaluator::createParameterPack(const std::string &name, const std::vector<Token::Literal> &values) {
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this->getScope(0).parameterPack = ParameterPack {
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name,
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values
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};
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}
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void Evaluator::createVariable(const std::string &name, ASTNode *type, const std::optional<Token::Literal> &value, bool outVariable) {
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auto &variables = *this->getScope(0).scope;
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for (auto &variable : variables) {
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if (variable->getVariableName() == name) {
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LogConsole::abortEvaluation(hex::format("variable with name '{}' already exists", name));
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}
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}
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auto startOffset = this->dataOffset();
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auto pattern = type == nullptr ? nullptr : type->createPatterns(this).front();
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this->dataOffset() = startOffset;
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if (pattern == nullptr) {
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// Handle auto variables
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if (!value.has_value())
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LogConsole::abortEvaluation("cannot determine type of auto variable", type);
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if (std::get_if<u128>(&value.value()) != nullptr)
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pattern = new PatternDataUnsigned(this, 0, sizeof(u128));
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else if (std::get_if<i128>(&value.value()) != nullptr)
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pattern = new PatternDataSigned(this, 0, sizeof(i128));
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else if (std::get_if<double>(&value.value()) != nullptr)
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pattern = new PatternDataFloat(this, 0, sizeof(double));
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else if (std::get_if<bool>(&value.value()) != nullptr)
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pattern = new PatternDataBoolean(this, 0);
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else if (std::get_if<char>(&value.value()) != nullptr)
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pattern = new PatternDataCharacter(this, 0);
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else if (std::get_if<PatternData *>(&value.value()) != nullptr)
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pattern = std::get<PatternData *>(value.value())->clone();
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else if (std::get_if<std::string>(&value.value()) != nullptr)
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pattern = new PatternDataString(this, 0, 1);
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else
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LogConsole::abortEvaluation("cannot determine type of auto variable", type);
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}
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pattern->setVariableName(name);
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pattern->setLocal(true);
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pattern->setOffset(this->getStack().size());
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this->getStack().emplace_back();
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variables.push_back(pattern);
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if (outVariable)
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this->m_outVariables[name] = pattern->getOffset();
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}
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void Evaluator::setVariable(const std::string &name, const Token::Literal &value) {
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PatternData *pattern = nullptr;
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{
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auto &variables = *this->getScope(0).scope;
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for (auto &variable : variables) {
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if (variable->getVariableName() == name) {
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pattern = variable;
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break;
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}
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}
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}
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if (pattern == nullptr) {
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auto &variables = *this->getGlobalScope().scope;
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for (auto &variable : variables) {
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if (variable->getVariableName() == name) {
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if (!variable->isLocal())
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LogConsole::abortEvaluation(hex::format("cannot modify global variable '{}' which has been placed in memory", name));
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pattern = variable;
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break;
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}
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}
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}
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if (pattern == nullptr)
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LogConsole::abortEvaluation(hex::format("no variable with name '{}' found", name));
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Token::Literal castedLiteral = std::visit(overloaded {
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[&](double &value) -> Token::Literal {
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if (dynamic_cast<PatternDataUnsigned *>(pattern))
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return u128(value) & bitmask(pattern->getSize() * 8);
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else if (dynamic_cast<PatternDataSigned *>(pattern))
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return i128(value) & bitmask(pattern->getSize() * 8);
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else if (dynamic_cast<PatternDataFloat *>(pattern))
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return pattern->getSize() == sizeof(float) ? double(float(value)) : value;
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else
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LogConsole::abortEvaluation(hex::format("cannot cast type 'double' to type '{}'", pattern->getTypeName()));
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},
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[&](const std::string &value) -> Token::Literal {
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if (dynamic_cast<PatternDataString *>(pattern))
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return value;
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else
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LogConsole::abortEvaluation(hex::format("cannot cast type 'string' to type '{}'", pattern->getTypeName()));
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},
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[&](PatternData *const &value) -> Token::Literal {
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if (value->getTypeName() == pattern->getTypeName())
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return value;
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else
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LogConsole::abortEvaluation(hex::format("cannot cast type '{}' to type '{}'", value->getTypeName(), pattern->getTypeName()));
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},
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[&](auto &&value) -> Token::Literal {
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if (dynamic_cast<PatternDataUnsigned *>(pattern) || dynamic_cast<PatternDataEnum *>(pattern))
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return u128(value) & bitmask(pattern->getSize() * 8);
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else if (dynamic_cast<PatternDataSigned *>(pattern))
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return i128(value) & bitmask(pattern->getSize() * 8);
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else if (dynamic_cast<PatternDataCharacter *>(pattern))
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return char(value);
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else if (dynamic_cast<PatternDataBoolean *>(pattern))
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return bool(value);
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else if (dynamic_cast<PatternDataFloat *>(pattern))
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return pattern->getSize() == sizeof(float) ? double(float(value)) : value;
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else
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LogConsole::abortEvaluation(hex::format("cannot cast integer literal to type '{}'", pattern->getTypeName()));
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} },
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value);
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this->getStack()[pattern->getOffset()] = castedLiteral;
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}
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std::optional<std::vector<PatternData *>> Evaluator::evaluate(const std::vector<ASTNode *> &ast) {
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this->m_stack.clear();
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this->m_customFunctions.clear();
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this->m_scopes.clear();
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this->m_mainResult.reset();
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this->m_aborted = false;
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if (this->m_allowDangerousFunctions == DangerousFunctionPermission::Deny)
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this->m_allowDangerousFunctions = DangerousFunctionPermission::Ask;
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this->m_dangerousFunctionCalled = false;
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ON_SCOPE_EXIT {
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this->m_envVariables.clear();
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};
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this->dataOffset() = 0x00;
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this->m_currPatternCount = 0;
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for (auto &func : this->m_customFunctionDefinitions)
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delete func;
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this->m_customFunctionDefinitions.clear();
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std::vector<PatternData *> patterns;
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try {
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this->setCurrentControlFlowStatement(ControlFlowStatement::None);
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pushScope(nullptr, patterns);
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ON_SCOPE_EXIT {
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popScope();
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};
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for (auto node : ast) {
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if (dynamic_cast<ASTNodeTypeDecl *>(node)) {
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; // Don't create patterns from type declarations
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} else if (dynamic_cast<ASTNodeFunctionCall *>(node)) {
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delete node->evaluate(this);
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} else if (dynamic_cast<ASTNodeFunctionDefinition *>(node)) {
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this->m_customFunctionDefinitions.push_back(node->evaluate(this));
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} else if (auto varDeclNode = dynamic_cast<ASTNodeVariableDecl *>(node)) {
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auto pattern = node->createPatterns(this).front();
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if (varDeclNode->getPlacementOffset() == nullptr) {
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auto type = varDeclNode->getType()->evaluate(this);
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ON_SCOPE_EXIT { delete type; };
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auto &name = pattern->getVariableName();
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this->createVariable(name, type, std::nullopt, varDeclNode->isOutVariable());
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if (varDeclNode->isInVariable() && this->m_inVariables.contains(name))
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this->setVariable(name, this->m_inVariables[name]);
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delete pattern;
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} else {
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patterns.push_back(pattern);
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}
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} else {
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auto newPatterns = node->createPatterns(this);
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std::copy(newPatterns.begin(), newPatterns.end(), std::back_inserter(patterns));
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}
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}
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if (this->m_customFunctions.contains("main")) {
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auto mainFunction = this->m_customFunctions["main"];
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if (mainFunction.parameterCount > 0)
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LogConsole::abortEvaluation("main function may not accept any arguments");
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this->m_mainResult = mainFunction.func(this, {});
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}
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} catch (PatternLanguageError &error) {
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this->m_console.log(LogConsole::Level::Error, error.what());
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if (error.getLineNumber() != 0)
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this->m_console.setHardError(error);
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for (auto &pattern : patterns)
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delete pattern;
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patterns.clear();
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this->m_currPatternCount = 0;
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return std::nullopt;
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}
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// Remove global local variables
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std::erase_if(patterns, [](PatternData *pattern) {
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return pattern->isLocal();
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});
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return patterns;
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}
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void Evaluator::patternCreated() {
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if (this->m_currPatternCount > this->m_patternLimit)
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LogConsole::abortEvaluation(hex::format("exceeded maximum number of patterns: {}", this->m_patternLimit));
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this->m_currPatternCount++;
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}
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void Evaluator::patternDestroyed() {
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this->m_currPatternCount--;
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}
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} |