diff options
Diffstat (limited to 'c_compiler/src/expression.cpp')
| -rw-r--r-- | c_compiler/src/expression.cpp | 190 |
1 files changed, 118 insertions, 72 deletions
diff --git a/c_compiler/src/expression.cpp b/c_compiler/src/expression.cpp index bd64325..cdf7d0a 100644 --- a/c_compiler/src/expression.cpp +++ b/c_compiler/src/expression.cpp @@ -2,7 +2,6 @@ #include <cstdio> #include <exception> -#include <iostream> #include <vector> // Expression definition @@ -102,18 +101,6 @@ void OperationExpression::evaluateExpression(VariableStackBindings bindings, uns lhs_stack_position, bindings.currentExpressionStackPosition()); } - -// PostfixExpression definition - -PostfixExpression::PostfixExpression() -{} - -VariableStackBindings PostfixExpression::printAsm(VariableStackBindings bindings, unsigned& label_count) const -{ - return bindings; -} - - // PostfixArrayElement PostfixArrayElement::PostfixArrayElement() @@ -137,12 +124,14 @@ VariableStackBindings PostfixFunctionCall::printAsm(VariableStackBindings bindin ExpressionPtr current_argument = argument_expression_list_; unsigned argument_counter = 0; - while(current_argument != nullptr) { + while(current_argument != nullptr) + { argument_vector.push_back(current_argument); current_argument = current_argument->nextExpression(); } - for(auto itr = argument_vector.rbegin(); itr != argument_vector.rend(); ++itr) { + for(auto itr = argument_vector.rbegin(); itr != argument_vector.rend(); ++itr) + { (*itr)->printAsm(bindings, label_count); if(argument_counter < 4) @@ -164,7 +153,8 @@ void PostfixFunctionCall::countArguments(unsigned int &argument_count) const argument_count = 0; - while(current_argument != nullptr) { + while(current_argument != nullptr) + { argument_count++; current_argument = current_argument->nextExpression(); } @@ -177,13 +167,46 @@ void PostfixFunctionCall::setPostfixExpression(Expression* postfix_expression) } -// UnaryExpression definition +// Post increment and decrement definition -UnaryExpression::UnaryExpression() +PostfixPostIncDecExpression::PostfixPostIncDecExpression(const std::string& _operator, Expression* postfix_expression) + : operator_(_operator), postfix_expression_(postfix_expression) {} -VariableStackBindings UnaryExpression::printAsm(VariableStackBindings bindings, unsigned& label_count) const +VariableStackBindings PostfixPostIncDecExpression::printAsm(VariableStackBindings bindings, unsigned& label_count) const { + postfix_expression_->printAsm(bindings, label_count); + if(operator_ == "++") + printf("\taddi\t$3,$2,1\n"); + else if(operator_ == "--") + printf("\tsubi\t$3,$2,1\n"); + else + throw std::runtime_error("Error : '"+operator_+"' not recognized"); + + printf("\tsw\t$2,%d($fp)\n\tsw\t$3,%d($fp)\n", bindings.currentExpressionStackPosition(), + postfix_expression_->postfixStackPosition(bindings)); + return bindings; +} + + +// Pre increment and decrement implementation + +UnaryPreIncDecExpression::UnaryPreIncDecExpression(const std::string& _operator, Expression* unary_expression) + : operator_(_operator), unary_expression_(unary_expression) +{} + +VariableStackBindings UnaryPreIncDecExpression::printAsm(VariableStackBindings bindings, unsigned& label_count) const +{ + unary_expression_->printAsm(bindings, label_count); + if(operator_ == "++") + printf("\taddi\t$2,$2,1\n"); + else if(operator_ == "--") + printf("\tsubi\t$2,$2,1\n"); + else + throw std::runtime_error("Error : '"+operator_+"' not recognized"); + + printf("\tsw\t$2,%d($fp)\n\tsw\t$2,%d($fp)\n", bindings.currentExpressionStackPosition(), + unary_expression_->postfixStackPosition(bindings)); return bindings; } @@ -245,17 +268,20 @@ VariableStackBindings MultiplicativeExpression::printAsm(VariableStackBindings b evaluateExpression(bindings, label_count); // then perform the right operation - if(operator_ == "*") { - printf("\tmul\t$2,$2,$3\n"); - - } else if(operator_ == "/" || operator_ == "%") { + if(operator_ == "*") + { + printf("\tmul\t$2,$2,$3\n"); + } + else if(operator_ == "/" || operator_ == "%") + { printf("\tdiv\t$2,$3\n"); if(operator_ == "/") printf("\tmflo\t$2\n"); else - printf("\tmfhi\t$2\n"); - - } else { + printf("\tmfhi\t$2\n"); + } + else + { throw std::runtime_error("Error : '"+operator_+"' not recognized"); } @@ -286,15 +312,20 @@ VariableStackBindings ShiftExpression::printAsm(VariableStackBindings bindings, { evaluateExpression(bindings, label_count); - if(operator_ == "<<") { - std::cout << "\tsll\t$2,$2,$3\n"; - } else if(operator_ == ">>") { - std::cout << "\tsra\t$2,$2,$3\n"; - } else { - std::cerr << "Error : don't recognize symbol '" << operator_ << "'\n"; + if(operator_ == "<<") + { + printf("\tsll\t$2,$2,$3\n"); + } + else if(operator_ == ">>") + { + printf("\tsra\t$2,$2,$3\n"); + } + else + { + throw std::runtime_error("Error : '"+operator_+"' not recognized"); } - std::cout << "\tsw\t$2," << bindings.currentExpressionStackPosition() << "($fp)\n"; + printf("\tsw\t$2,%d($fp)\n", bindings.currentExpressionStackPosition()); return bindings; } @@ -317,34 +348,47 @@ VariableStackBindings RelationalExpression::printAsm(VariableStackBindings bindi { evaluateExpression(bindings, label_count); - if(operator_ == "<") { - std::cout << "\tslt\t$2,$2,$3\n"; - } else if(operator_ == ">") { - std::cout << "\tslt\t$2,$3,$2\n"; - } else if(operator_ == "<=") { - std::cout << "\tslt\t$2,$3,$2\n\txori\t$2,$2,0x1\n"; - } else if(operator_ == ">=") { - std::cout << "\tslt\t$2,$2,$3\n\txori\t$2,$2,0x1\n"; - } else { - std::cerr << "Error : don't recognize symbol '" << operator_ << "'\n"; + if(operator_ == "<") + { + printf("\tslt\t$2,$2,$3\n"); + } + else if(operator_ == ">") + { + printf("\tslt\t$2,$3,$2\n"); + } + else if(operator_ == "<=") + { + printf("\tslt\t$2,$3,$2\n\txori\t$2,$2,0x1\n"); + } + else if(operator_ == ">=") + { + printf("\tslt\t$2,$2,$3\n\txori\t$2,$2,0x1\n"); + } + else + { + throw std::runtime_error("Error : '"+operator_+"' not recognized"); } // TODO might get rid of this - std::cout << "\tandi\t$2,$2,0x00ff\n"; - - std::cout << "\tsw\t$2," << bindings.currentExpressionStackPosition() << "($fp)\n"; - + printf("\tandi\t$2,$2,0x00ff\n\tsw\t$2,%d($fp)\n", bindings.currentExpressionStackPosition()); return bindings; } int RelationalExpression::constantFold() const { if(operator_ == "<") + { return lhs_->constantFold()<rhs_->constantFold(); + } else if(operator_ == ">") + { return lhs_->constantFold()>rhs_->constantFold(); + } else if(operator_ == "<=") + { return lhs_->constantFold()<=rhs_->constantFold(); + } + return lhs_->constantFold()>=rhs_->constantFold(); } @@ -358,22 +402,23 @@ EqualityExpression::EqualityExpression(Expression* lhs, const std::string& _oper VariableStackBindings EqualityExpression::printAsm(VariableStackBindings bindings, unsigned& label_count) const { evaluateExpression(bindings, label_count); + printf("\txor\t$2,$2,$3\n"); - std::cout << "\txor\t$2,$2,$3\n"; - - if(operator_ == "==") { - std::cout << "\tsltiu\t$2,$2,1\n"; - } else if(operator_ == "!="){ - std::cout << "\tsltu\t$2,$0,$2\n"; - } else { - std::cerr << "Error : no instruction found for operator '" << operator_ << "'\n"; + if(operator_ == "==") + { + printf("\tsltiu\t$2,$2,1\n"); + } + else if(operator_ == "!=") + { + printf("\tsltu\t$2,$0,$2\n"); + } + else + { + throw std::runtime_error("Error : '"+operator_+"' not recognized"); } // TODO Work out why it is necessary to remove bytes 3 and 2. - std::cout << "\tandi\t$2,$2,0x00ff\n"; - - std::cout << "\tsw\t$2," << bindings.currentExpressionStackPosition() << "($fp)\n"; - + printf("\tandi\t$2,$2,0x00ff\n\tsw\t$2,%d($fp)\n", bindings.currentExpressionStackPosition()); return bindings; } @@ -394,11 +439,7 @@ AndExpression::AndExpression(Expression* lhs, Expression* rhs) VariableStackBindings AndExpression::printAsm(VariableStackBindings bindings, unsigned& label_count) const { evaluateExpression(bindings, label_count); - - std::cout << "\tand\t$2,$2,$3\n"; - - std::cout << "\tsw\t$2," << bindings.currentExpressionStackPosition() << "($fp)\n"; - + printf("\tand\t$2,$2,$3\n\tsw\t$2,%d($fp)\n", bindings.currentExpressionStackPosition()); return bindings; } @@ -534,16 +575,20 @@ VariableStackBindings Identifier::printAsm(VariableStackBindings bindings, unsig { (void)label_count; - if(bindings.bindingExists(id_)) { - if(bindings.stackPosition(id_) == -1) { + if(bindings.bindingExists(id_)) + { + if(bindings.stackPosition(id_) == -1) + { // it's a global variable - printf("\tlui\t$2,%%hi(%s)\n\tlw\t$2,%%lo(%s)($2)\n", id_.c_str(), id_.c_str()); - - } else { + printf("\tlui\t$2,%%hi(%s)\n\tlw\t$2,%%lo(%s)($2)\n", id_.c_str(), id_.c_str()); + } + else + { printf("\tlw\t$2,%d($fp)\n", bindings.stackPosition(id_)); } - - } else{ + } + else + { throw std::runtime_error("Error : Can't find '"+id_+"' in current scope binding"); } @@ -553,7 +598,8 @@ VariableStackBindings Identifier::printAsm(VariableStackBindings bindings, unsig int Identifier::postfixStackPosition(VariableStackBindings bindings) const { - if(bindings.bindingExists(id_)) { + if(bindings.bindingExists(id_)) + { return bindings.stackPosition(id_); } |