typet c_typecheck_baset::enum_constant_type( const mp_integer &min_value, const mp_integer &max_value) const { if(config.ansi_c.mode==configt::ansi_ct::flavourt::VISUAL_STUDIO) { return signed_int_type(); } else { // enum constants are at least 'int', but may be made larger. // 'Packing' has no influence. if(max_value<(mp_integer(1)<<(config.ansi_c.int_width-1)) && min_value>=-(mp_integer(1)<<(config.ansi_c.int_width-1))) return signed_int_type(); else if(max_value<(mp_integer(1)<<config.ansi_c.int_width) && min_value>=0) return unsigned_int_type(); else if(max_value<(mp_integer(1)<<config.ansi_c.long_int_width) && min_value>=0) return unsigned_long_int_type(); else if(max_value<(mp_integer(1)<<config.ansi_c.long_long_int_width) && min_value>=0) return unsigned_long_long_int_type(); else if(max_value<(mp_integer(1)<<(config.ansi_c.long_int_width-1)) && min_value>=-(mp_integer(1)<<(config.ansi_c.long_int_width-1))) return signed_long_int_type(); else return signed_long_long_int_type(); } }
typet c_typecheck_baset::enum_underlying_type( const mp_integer &min_value, const mp_integer &max_value, bool is_packed) const { if(config.ansi_c.mode==configt::ansi_ct::flavourt::VISUAL_STUDIO) { return signed_int_type(); } else { if(min_value<0) { // We'll want a signed type. if(is_packed) { // If packed, there are smaller options. if(max_value<(mp_integer(1)<<(config.ansi_c.char_width-1)) && min_value>=-(mp_integer(1)<<(config.ansi_c.char_width-1))) return signed_char_type(); else if(max_value<(mp_integer(1)<<(config.ansi_c.short_int_width-1)) && min_value>=-(mp_integer(1)<<(config.ansi_c.short_int_width-1))) return signed_short_int_type(); } if(max_value<(mp_integer(1)<<(config.ansi_c.int_width-1)) && min_value>=-(mp_integer(1)<<(config.ansi_c.int_width-1))) return signed_int_type(); else if(max_value<(mp_integer(1)<<(config.ansi_c.long_int_width-1)) && min_value>=-(mp_integer(1)<<(config.ansi_c.long_int_width-1))) return signed_long_int_type(); else return signed_long_long_int_type(); } else { // We'll want an unsigned type. if(is_packed) { // If packed, there are smaller options. if(max_value<(mp_integer(1)<<config.ansi_c.char_width)) return unsigned_char_type(); else if(max_value<(mp_integer(1)<<config.ansi_c.short_int_width)) return unsigned_short_int_type(); } if(max_value<(mp_integer(1)<<config.ansi_c.int_width)) return unsigned_int_type(); else if(max_value<(mp_integer(1)<<config.ansi_c.long_int_width)) return unsigned_long_int_type(); else return unsigned_long_long_int_type(); } } }
typet size_type() { // The size type varies. This is unsigned int on some systems, // and unsigned long int on others, // and unsigned long long on say Windows 64. if(config.ansi_c.pointer_width==config.ansi_c.int_width) return unsigned_int_type(); else if(config.ansi_c.pointer_width==config.ansi_c.long_int_width) return unsigned_long_int_type(); else if(config.ansi_c.pointer_width==config.ansi_c.long_long_int_width) return unsigned_long_long_int_type(); else assert(false); // aaah! }
void c_typecastt::implicit_typecast_arithmetic( exprt &expr, c_typet c_type) { typet new_type; const typet &expr_type=ns.follow(expr.type()); switch(c_type) { case PTR: if(expr_type.id()==ID_array) { new_type.id(ID_pointer); new_type.subtype()=expr_type.subtype(); break; } return; case BOOL: assert(false); // should always be promoted to int case CHAR: assert(false); // should always be promoted to int case UCHAR: assert(false); // should always be promoted to int case SHORT: assert(false); // should always be promoted to int case USHORT: assert(false); // should always be promoted to int case INT: new_type=signed_int_type(); break; case UINT: new_type=unsigned_int_type(); break; case LONG: new_type=signed_long_int_type(); break; case ULONG: new_type=unsigned_long_int_type(); break; case LONGLONG: new_type=signed_long_long_int_type(); break; case ULONGLONG: new_type=unsigned_long_long_int_type(); break; case SINGLE: new_type=float_type(); break; case DOUBLE: new_type=double_type(); break; case LONGDOUBLE: new_type=long_double_type(); break; case FLOAT128: new_type=ieee_float_spect::quadruple_precision().to_type(); break; case RATIONAL: new_type=rational_typet(); break; case REAL: new_type=real_typet(); break; case INTEGER: new_type=integer_typet(); break; case COMPLEX: return; // do nothing default: return; } if(new_type!=expr_type) do_typecast(expr, new_type); }
codet java_bytecode_convertt::convert_instructions( const instructionst &instructions, const code_typet &method_type) { // Run a worklist algorithm, assuming that the bytecode has not // been tampered with. See "Leroy, X. (2003). Java bytecode // verification: algorithms and formalizations. Journal of Automated // Reasoning, 30(3-4), 235-269." for a more complete treatment. // first pass: get targets and map addresses to instructions struct converted_instructiont { converted_instructiont( const instructionst::const_iterator &it, const codet &_code):source(it), code(_code), done(false) { } instructionst::const_iterator source; std::list<unsigned> successors; std::set<unsigned> predecessors; codet code; stackt stack; bool done; }; typedef std::map<unsigned, converted_instructiont> address_mapt; address_mapt address_map; std::set<unsigned> targets; for(instructionst::const_iterator i_it=instructions.begin(); i_it!=instructions.end(); i_it++) { std::pair<address_mapt::iterator, bool> a_entry= address_map.insert(std::make_pair( i_it->address, converted_instructiont(i_it, code_skipt()))); assert(a_entry.second); // addresses are strictly increasing, hence we must have inserted // a new maximal key assert(a_entry.first==--address_map.end()); if(i_it->statement!="goto" && i_it->statement!="return" && !(i_it->statement==patternt("?return")) && i_it->statement!="athrow") { instructionst::const_iterator next=i_it; if(++next!=instructions.end()) a_entry.first->second.successors.push_back(next->address); } if(i_it->statement=="goto" || i_it->statement==patternt("if_?cmp??") || i_it->statement==patternt("if??") || i_it->statement=="ifnonnull" || i_it->statement=="ifnull") { assert(!i_it->args.empty()); const unsigned target=safe_string2unsigned( id2string(to_constant_expr(i_it->args[0]).get_value())); targets.insert(target); a_entry.first->second.successors.push_back(target); } else if(i_it->statement=="tableswitch" || i_it->statement=="lookupswitch") { bool is_label=true; for(instructiont::argst::const_iterator a_it=i_it->args.begin(); a_it!=i_it->args.end(); a_it++, is_label=!is_label) { if(is_label) { const unsigned target=safe_string2unsigned( id2string(to_constant_expr(*a_it).get_value())); targets.insert(target); a_entry.first->second.successors.push_back(target); } } } } for(address_mapt::iterator it=address_map.begin(); it!=address_map.end(); ++it) { for(unsigned s : it->second.successors) { address_mapt::iterator a_it=address_map.find(s); assert(a_it!=address_map.end()); a_it->second.predecessors.insert(it->first); } } std::set<unsigned> working_set; if(!instructions.empty()) working_set.insert(instructions.front().address); while(!working_set.empty()) { std::set<unsigned>::iterator cur=working_set.begin(); address_mapt::iterator a_it=address_map.find(*cur); assert(a_it!=address_map.end()); working_set.erase(cur); if(a_it->second.done) continue; working_set.insert(a_it->second.successors.begin(), a_it->second.successors.end()); instructionst::const_iterator i_it=a_it->second.source; stack.swap(a_it->second.stack); a_it->second.stack.clear(); codet &c=a_it->second.code; assert(stack.empty() || a_it->second.predecessors.size()<=1 || has_prefix(stack.front().get_string(ID_C_base_name), "$stack")); irep_idt statement=i_it->statement; exprt arg0=i_it->args.size()>=1?i_it->args[0]:nil_exprt(); exprt arg1=i_it->args.size()>=2?i_it->args[1]:nil_exprt(); const bytecode_infot &bytecode_info=get_bytecode_info(statement); // deal with _idx suffixes if(statement.size()>=2 && statement[statement.size()-2]=='_' && isdigit(statement[statement.size()-1])) { arg0=constant_exprt( std::string(id2string(statement), statement.size()-1, 1), integer_typet()); statement=std::string(id2string(statement), 0, statement.size()-2); } exprt::operandst op=pop(bytecode_info.pop); exprt::operandst results; results.resize(bytecode_info.push, nil_exprt()); if(statement=="aconst_null") { assert(results.size()==1); results[0]=gen_zero(java_reference_type(void_typet())); } else if(statement=="athrow") { assert(op.size()==1 && results.size()==1); side_effect_expr_throwt throw_expr; throw_expr.add_source_location()=i_it->source_location; throw_expr.copy_to_operands(op[0]); c=code_expressiont(throw_expr); results[0]=op[0]; } else if(statement=="checkcast") { // checkcast throws an exception in case a cast of object // on stack to given type fails. // The stack isn't modified. assert(op.size()==1 && results.size()==1); results[0]=op[0]; } else if(statement=="invokedynamic") { // not used in Java code_typet &code_type=to_code_type(arg0.type()); const code_typet::parameterst ¶meters(code_type.parameters()); pop(parameters.size()); const typet &return_type=code_type.return_type(); if(return_type.id()!=ID_empty) { results.resize(1); results[0]=nil_exprt(); } } else if(statement=="invokeinterface" || statement=="invokespecial" || statement=="invokevirtual" || statement=="invokestatic") { const bool use_this(statement != "invokestatic"); const bool is_virtual( statement == "invokevirtual" || statement == "invokeinterface"); code_typet &code_type=to_code_type(arg0.type()); code_typet::parameterst ¶meters(code_type.parameters()); if(use_this) { if(parameters.empty() || !parameters[0].get_this()) { const empty_typet empty; pointer_typet object_ref_type(empty); code_typet::parametert this_p(object_ref_type); this_p.set_this(); this_p.set_base_name("this"); parameters.insert(parameters.begin(), this_p); } } code_function_callt call; call.add_source_location()=i_it->source_location; call.arguments() = pop(parameters.size()); // double-check a bit if(use_this) { const exprt &this_arg=call.arguments().front(); assert(this_arg.type().id()==ID_pointer); } // do some type adjustment for the arguments, // as Java promotes arguments for(unsigned i=0; i<parameters.size(); i++) { const typet &type=parameters[i].type(); if(type==java_boolean_type() || type==java_char_type() || type==java_byte_type() || type==java_short_type()) { assert(i<call.arguments().size()); call.arguments()[i].make_typecast(type); } } // do some type adjustment for return values const typet &return_type=code_type.return_type(); if(return_type.id()!=ID_empty) { // return types are promoted in Java call.lhs()=tmp_variable("return", return_type); exprt promoted=java_bytecode_promotion(call.lhs()); results.resize(1); results[0]=promoted; } assert(arg0.id()==ID_virtual_function); // does the function symbol exist? irep_idt id=arg0.get(ID_identifier); if(symbol_table.symbols.find(id)==symbol_table.symbols.end()) { // no, create stub symbolt symbol; symbol.name=id; symbol.base_name=arg0.get(ID_C_base_name); symbol.type=arg0.type(); symbol.value.make_nil(); symbol.mode=ID_java; symbol_table.add(symbol); } if(is_virtual) { // dynamic binding assert(use_this); assert(!call.arguments().empty()); call.function()=arg0; } else { // static binding /*if(id == "java::java.lang.String.charAt:(I)C") call.function()=symbol_exprt("java::__CPROVER_uninterpreted_char_at", arg0.type()); else*/ call.function()=symbol_exprt(arg0.get(ID_identifier), arg0.type()); } call.function().add_source_location()=i_it->source_location; c = call; } else if(statement=="return") { assert(op.empty() && results.empty()); c=code_returnt(); } else if(statement==patternt("?return")) { // Return types are promoted in java, so this might need // conversion. assert(op.size()==1 && results.empty()); exprt r=op[0]; if(r.type()!=method_return_type) r=typecast_exprt(r, method_return_type); c=code_returnt(r); } else if(statement==patternt("?astore")) { assert(op.size()==3 && results.empty()); char type_char=statement[0]; exprt pointer= typecast_exprt(op[0], java_array_type(type_char)); const dereference_exprt deref(pointer, pointer.type().subtype()); const member_exprt data_ptr( deref, "data", pointer_typet(java_type_from_char(type_char))); plus_exprt data_plus_offset(data_ptr, op[1], data_ptr.type()); typet element_type=data_ptr.type().subtype(); const dereference_exprt element(data_plus_offset, element_type); c=code_assignt(element, op[2]); } else if(statement==patternt("?store")) { // store value into some local variable assert(op.size()==1 && results.empty()); exprt var=variable(arg0, statement[0]); const bool is_array('a' == statement[0]); if(is_array) var.type()=op[0].type(); c=code_assignt(var, op[0]); } else if(statement==patternt("?aload")) { assert(op.size() == 2 && results.size() == 1); char type_char=statement[0]; exprt pointer= typecast_exprt(op[0], java_array_type(type_char)); const dereference_exprt deref(pointer, pointer.type().subtype()); const member_exprt data_ptr( deref, "data", pointer_typet(java_type_from_char(type_char))); plus_exprt data_plus_offset(data_ptr, op[1], data_ptr.type()); typet element_type=data_ptr.type().subtype(); dereference_exprt element(data_plus_offset, element_type); results[0]=java_bytecode_promotion(element); } else if(statement==patternt("?load")) { // load a value from a local variable results[0]=variable(arg0, statement[0]); } else if(statement=="ldc" || statement=="ldc_w" || statement=="ldc2" || statement=="ldc2_w") { assert(op.empty() && results.size()==1); // 1) Pushing a String causes a reference to a java.lang.String object // to be constructed and pushed onto the operand stack. // 2) Pushing an int or a float causes a primitive value to be pushed // onto the stack. // 3) Pushing a Class constant causes a reference to a java.lang.Class // to be pushed onto the operand stack if(arg0.id()==ID_java_string_literal) { // these need to be references to java.lang.String results[0]=arg0; symbol_typet string_type("java::java.lang.String"); results[0].type()=pointer_typet(string_type); } else if(arg0.id()==ID_type) { irep_idt class_id=arg0.type().get(ID_identifier); symbol_typet java_lang_Class("java::java.lang.Class"); symbol_exprt symbol_expr(id2string(class_id)+"@class_model", java_lang_Class); address_of_exprt address_of_expr(symbol_expr); results[0]=address_of_expr; } else if(arg0.id()==ID_constant) { results[0]=arg0; } else { error() << "unexpected ldc argument" << eom; throw 0; } } else if(statement=="goto" || statement=="goto_w") { assert(op.empty() && results.empty()); irep_idt number=to_constant_expr(arg0).get_value(); code_gotot code_goto(label(number)); c=code_goto; } else if(statement=="iconst_m1") { assert(results.size()==1); results[0]=from_integer(-1, java_int_type()); } else if(statement==patternt("?const")) { assert(results.size() == 1); const char type_char=statement[0]; const bool is_double('d' == type_char); const bool is_float('f' == type_char); if(is_double || is_float) { const ieee_float_spect spec( is_float ? ieee_float_spect::single_precision() : ieee_float_spect::double_precision()); ieee_floatt value(spec); const typet &arg_type(arg0.type()); if(ID_integer == arg_type.id()) value.from_integer(arg0.get_int(ID_value)); else value.from_expr(to_constant_expr(arg0)); results[0] = value.to_expr(); } else { const unsigned int value(arg0.get_unsigned_int(ID_value)); const typet type=java_type_from_char(statement[0]); results[0] = as_number(value, type); } } else if(statement==patternt("?ipush")) { assert(results.size()==1); results[0]=typecast_exprt(arg0, java_int_type()); } else if(statement==patternt("if_?cmp??")) { irep_idt number=to_constant_expr(arg0).get_value(); assert(op.size()==2 && results.empty()); code_ifthenelset code_branch; const irep_idt cmp_op=get_if_cmp_operator(statement); binary_relation_exprt condition(op[0], cmp_op, op[1]); cast_if_necessary(condition); code_branch.cond()=condition; code_branch.then_case()=code_gotot(label(number)); code_branch.then_case().add_source_location()=i_it->source_location; code_branch.add_source_location()=i_it->source_location; c=code_branch; } else if(statement==patternt("if??")) { const irep_idt id= statement=="ifeq"?ID_equal: statement=="ifne"?ID_notequal: statement=="iflt"?ID_lt: statement=="ifge"?ID_ge: statement=="ifgt"?ID_gt: statement=="ifle"?ID_le: (assert(false), ""); irep_idt number=to_constant_expr(arg0).get_value(); assert(op.size()==1 && results.empty()); code_ifthenelset code_branch; code_branch.cond()=binary_relation_exprt(op[0], id, gen_zero(op[0].type())); code_branch.cond().add_source_location()=i_it->source_location; code_branch.then_case()=code_gotot(label(number)); code_branch.then_case().add_source_location()=i_it->source_location; code_branch.add_source_location()=i_it->source_location; c=code_branch; } else if(statement==patternt("ifnonnull")) { irep_idt number=to_constant_expr(arg0).get_value(); assert(op.size()==1 && results.empty()); code_ifthenelset code_branch; const typecast_exprt lhs(op[0], pointer_typet()); const exprt rhs(gen_zero(lhs.type())); code_branch.cond()=binary_relation_exprt(lhs, ID_notequal, rhs); code_branch.then_case()=code_gotot(label(number)); code_branch.then_case().add_source_location()=i_it->source_location; code_branch.add_source_location()=i_it->source_location; c=code_branch; } else if(statement==patternt("ifnull")) { assert(op.size()==1 && results.empty()); irep_idt number=to_constant_expr(arg0).get_value(); code_ifthenelset code_branch; const typecast_exprt lhs(op[0], pointer_typet(empty_typet())); const exprt rhs(gen_zero(lhs.type())); code_branch.cond()=binary_relation_exprt(lhs, ID_equal, rhs); code_branch.then_case()=code_gotot(label(number)); code_branch.then_case().add_source_location()=i_it->source_location; code_branch.add_source_location()=i_it->source_location; c=code_branch; } else if(statement=="iinc") { code_assignt code_assign; code_assign.lhs()=variable(arg0, 'i'); code_assign.rhs()=plus_exprt( variable(arg0, 'i'), typecast_exprt(arg1, java_int_type())); c=code_assign; } else if(statement==patternt("?xor")) { assert(op.size()==2 && results.size()==1); results[0]=bitxor_exprt(op[0], op[1]); } else if(statement==patternt("?or")) { assert(op.size()==2 && results.size()==1); results[0]=bitor_exprt(op[0], op[1]); } else if(statement==patternt("?and")) { assert(op.size()==2 && results.size()==1); results[0]=bitand_exprt(op[0], op[1]); } else if(statement==patternt("?shl")) { assert(op.size()==2 && results.size()==1); results[0]=shl_exprt(op[0], op[1]); } else if(statement==patternt("?shr")) { assert(op.size()==2 && results.size()==1); results[0]=ashr_exprt(op[0], op[1]); } else if(statement==patternt("?ushr")) { assert(op.size()==2 && results.size()==1); const typet type(java_type_from_char(statement[0])); const unsigned int width(type.get_unsigned_int(ID_width)); typet target=unsigned_long_int_type(); target.set(ID_width, width); const typecast_exprt lhs(op[0], target); const typecast_exprt rhs(op[1], target); results[0]=lshr_exprt(lhs, rhs); } else if(statement==patternt("?add")) { assert(op.size()==2 && results.size()==1); results[0]=plus_exprt(op[0], op[1]); } else if(statement==patternt("?sub")) { assert(op.size()==2 && results.size()==1); results[0]=minus_exprt(op[0], op[1]); } else if(statement==patternt("?div")) { assert(op.size()==2 && results.size()==1); results[0]=div_exprt(op[0], op[1]); } else if(statement==patternt("?mul")) { assert(op.size()==2 && results.size()==1); results[0]=mult_exprt(op[0], op[1]); } else if(statement==patternt("?neg")) { assert(op.size()==1 && results.size()==1); results[0]=unary_minus_exprt(op[0], op[0].type()); } else if(statement==patternt("?rem")) { assert(op.size()==2 && results.size()==1); if(statement=="frem" || statement=="drem") results[0]=rem_exprt(op[0], op[1]); else results[0]=mod_exprt(op[0], op[1]); } else if(statement==patternt("?cmp")) { assert(op.size() == 2 && results.size() == 1); // The integer result on the stack is: // 0 if op[0] equals op[1] // -1 if op[0] is less than op[1] // 1 if op[0] is greater than op[1] const typet t=java_int_type(); results[0]= if_exprt(binary_relation_exprt(op[0], ID_equal, op[1]), gen_zero(t), if_exprt(binary_relation_exprt(op[0], ID_gt, op[1]), from_integer(1, t), from_integer(-1, t))); } else if(statement==patternt("?cmp?")) { assert(op.size()==2 && results.size()==1); const floatbv_typet type(to_floatbv_type(java_type_from_char(statement[0]))); const ieee_float_spect spec(type); const ieee_floatt nan(ieee_floatt::NaN(spec)); const constant_exprt nan_expr(nan.to_expr()); const int nan_value(statement[4] == 'l' ? -1 : 1); const typet result_type(java_int_type()); const exprt nan_result(from_integer(nan_value, result_type)); // (value1 == NaN || value2 == NaN) ? nan_value : value1 < value2 ? -1 : value2 < value1 1 ? 1 : 0; // (value1 == NaN || value2 == NaN) ? nan_value : value1 == value2 ? 0 : value1 < value2 -1 ? 1 : 0; results[0]= if_exprt(or_exprt(ieee_float_equal_exprt(nan_expr, op[0]), ieee_float_equal_exprt(nan_expr, op[1])), nan_result, if_exprt(ieee_float_equal_exprt(op[0], op[1]), gen_zero(result_type), if_exprt(binary_relation_exprt(op[0], ID_lt, op[1]), from_integer(-1, result_type), from_integer(1, result_type)))); } else if(statement==patternt("?cmpl")) { assert(op.size()==2 && results.size()==1); results[0]=binary_relation_exprt(op[0], ID_lt, op[1]); } else if(statement=="dup") { assert(op.size()==1 && results.size()==2); results[0]=results[1]=op[0]; } else if(statement=="dup_x1") { assert(op.size()==2 && results.size()==3); results[0]=op[1]; results[1]=op[0]; results[2]=op[1]; } else if(statement=="dup_x2") { assert(op.size()==3 && results.size()==4); results[0]=op[2]; results[1]=op[0]; results[2]=op[1]; results[3]=op[2]; } // dup2* behaviour depends on the size of the operands on the // stack else if(statement=="dup2") { assert(!stack.empty() && results.empty()); if(stack.back().type().get_unsigned_int(ID_width)==32) op=pop(2); else op=pop(1); results.insert(results.end(), op.begin(), op.end()); results.insert(results.end(), op.begin(), op.end()); } else if(statement=="dup2_x1") { assert(!stack.empty() && results.empty()); if(stack.back().type().get_unsigned_int(ID_width)==32) op=pop(3); else op=pop(2); results.insert(results.end(), op.begin()+1, op.end()); results.insert(results.end(), op.begin(), op.end()); } else if(statement=="dup2_x2") { assert(!stack.empty() && results.empty()); if(stack.back().type().get_unsigned_int(ID_width)==32) op=pop(2); else op=pop(1); assert(!stack.empty()); exprt::operandst op2; if(stack.back().type().get_unsigned_int(ID_width)==32) op2=pop(2); else op2=pop(1); results.insert(results.end(), op.begin(), op.end()); results.insert(results.end(), op2.begin(), op2.end()); results.insert(results.end(), op.begin(), op.end()); } else if(statement=="dconst") { assert(op.empty() && results.size()==1); } else if(statement=="fconst") { assert(op.empty() && results.size()==1); } else if(statement=="getfield") { assert(op.size()==1 && results.size()==1); results[0]=to_member(op[0], arg0); } else if(statement=="getstatic") { assert(op.empty() && results.size()==1); symbol_exprt symbol_expr(arg0.type()); symbol_expr.set_identifier(arg0.get_string(ID_class)+"."+arg0.get_string(ID_component_name)); results[0]=symbol_expr; } else if(statement=="putfield") { assert(op.size()==2 && results.size()==0); c = code_assignt(to_member(op[0], arg0), op[1]); } else if(statement=="putstatic") { assert(op.size()==1 && results.empty()); symbol_exprt symbol_expr(arg0.type()); symbol_expr.set_identifier(arg0.get_string(ID_class)+"."+arg0.get_string(ID_component_name)); c=code_assignt(symbol_expr, op[0]); } else if(statement==patternt("?2?")) // i2c etc. { assert(op.size()==1 && results.size()==1); results[0]=typecast_exprt(op[0], java_type_from_char(statement[2])); } else if(statement=="new") { // use temporary since the stack symbol might get duplicated assert(op.empty() && results.size()==1); const pointer_typet ref_type(arg0.type()); exprt java_new_expr=side_effect_exprt(ID_java_new, ref_type); if(!i_it->source_location.get_line().empty()) java_new_expr.add_source_location()=i_it->source_location; const exprt tmp=tmp_variable("new", ref_type); c=code_assignt(tmp, java_new_expr); results[0]=tmp; } else if(statement=="newarray" || statement=="anewarray") { // the op is the array size assert(op.size()==1 && results.size()==1); char element_type; if(statement=="newarray") { irep_idt id=arg0.type().id(); if(id==ID_bool) element_type='z'; else if(id==ID_char) element_type='c'; else if(id==ID_float) element_type='f'; else if(id==ID_double) element_type='d'; else if(id==ID_byte) element_type='b'; else if(id==ID_short) element_type='s'; else if(id==ID_int) element_type='i'; else if(id==ID_long) element_type='j'; else element_type='?'; } else element_type='a'; const pointer_typet ref_type=java_array_type(element_type); side_effect_exprt java_new_array(ID_java_new_array, ref_type); java_new_array.copy_to_operands(op[0]); if(!i_it->source_location.get_line().empty()) java_new_array.add_source_location()=i_it->source_location; const exprt tmp=tmp_variable("newarray", ref_type); c=code_assignt(tmp, java_new_array); results[0]=tmp; } else if(statement=="multianewarray") { // The first argument is the type, the second argument is the dimension. // The size of each dimension is on the stack. irep_idt number=to_constant_expr(arg1).get_value(); unsigned dimension=safe_c_str2unsigned(number.c_str()); op=pop(dimension); assert(results.size()==1); // arg0.type() const pointer_typet ref_type=java_array_type('a'); side_effect_exprt java_new_array(ID_java_new_array, ref_type); java_new_array.operands()=op; if(!i_it->source_location.get_line().empty()) java_new_array.add_source_location()=i_it->source_location; const exprt tmp=tmp_variable("newarray", ref_type); c=code_assignt(tmp, java_new_array); results[0]=tmp; } else if(statement=="arraylength") { assert(op.size()==1 && results.size()==1); exprt pointer= typecast_exprt(op[0], java_array_type(statement[0])); const dereference_exprt array(pointer, pointer.type().subtype()); assert(pointer.type().subtype().id()==ID_symbol); const member_exprt length(array, "length", java_int_type()); results[0]=length; } else if(statement=="tableswitch" || statement=="lookupswitch") { assert(op.size()==1 && results.size()==0); // we turn into switch-case code_switcht code_switch; code_switch.add_source_location()=i_it->source_location; code_switch.value()=op[0]; code_blockt code_block; code_block.add_source_location()=i_it->source_location; bool is_label=true; for(instructiont::argst::const_iterator a_it=i_it->args.begin(); a_it!=i_it->args.end(); a_it++, is_label=!is_label) { if(is_label) { code_switch_caset code_case; code_case.add_source_location()=i_it->source_location; irep_idt number=to_constant_expr(*a_it).get_value(); code_case.code()=code_gotot(label(number)); code_case.code().add_source_location()=i_it->source_location; if(a_it==i_it->args.begin()) code_case.set_default(); else { instructiont::argst::const_iterator prev=a_it; prev--; code_case.case_op()=typecast_exprt(*prev, op[0].type()); code_case.case_op().add_source_location()=i_it->source_location; } code_block.add(code_case); } } code_switch.body()=code_block; c=code_switch; } else if(statement=="pop" || statement=="pop2") { // these are skips c=code_skipt(); // pop2 removes two single-word items from the stack (e.g. two // integers, or an integer and an object reference) or one // two-word item (i.e. a double or a long). // http://cs.au.dk/~mis/dOvs/jvmspec/ref-pop2.html if(statement=="pop2" && op[0].type().get_unsigned_int(ID_width)==32) pop(1); } else if(statement=="instanceof") { assert(op.size()==1 && results.size()==1); results[0]= binary_predicate_exprt(op[0], "java_instanceof", arg0); } else { c=codet(statement); c.operands()=op; } if(!i_it->source_location.get_line().empty()) c.add_source_location()=i_it->source_location; push(results); a_it->second.done=true; for(std::list<unsigned>::iterator it=a_it->second.successors.begin(); it!=a_it->second.successors.end(); ++it) { address_mapt::iterator a_it2=address_map.find(*it); assert(a_it2!=address_map.end()); if(!stack.empty() && a_it2->second.predecessors.size()>1) { // copy into temporaries code_blockt more_code; // introduce temporaries when successor is seen for the first // time if(a_it2->second.stack.empty()) { for(stackt::iterator s_it=stack.begin(); s_it!=stack.end(); ++s_it) { symbol_exprt lhs=tmp_variable("$stack", s_it->type()); code_assignt a(lhs, *s_it); more_code.copy_to_operands(a); s_it->swap(lhs); } } else { assert(a_it2->second.stack.size()==stack.size()); stackt::const_iterator os_it=a_it2->second.stack.begin(); for(stackt::iterator s_it=stack.begin(); s_it!=stack.end(); ++s_it) { assert(has_prefix(os_it->get_string(ID_C_base_name), "$stack")); symbol_exprt lhs=to_symbol_expr(*os_it); code_assignt a(lhs, *s_it); more_code.copy_to_operands(a); s_it->swap(lhs); ++os_it; } } if(results.empty()) { more_code.copy_to_operands(c); c.swap(more_code); } else { c.make_block(); forall_operands(o_it, more_code) c.copy_to_operands(*o_it); } } a_it2->second.stack=stack; } } // TODO: add exception handlers from exception table // review successor computation of athrow! code_blockt code; // temporaries for(const auto & var : tmp_vars) { code.add(code_declt(var)); } for(const auto & it : address_map) { const unsigned address=it.first; assert(it.first==it.second.source->address); const codet &c=it.second.code; if(targets.find(address)!=targets.end()) code.add(code_labelt(label(i2string(address)), c)); else if(c.get_statement()!=ID_skip) code.add(c); } return code; }
void printf_formattert::process_format(std::ostream &out) { exprt tmp; format_constantt format_constant; format_constant.precision=6; format_constant.min_width=0; format_constant.zero_padding=false; char ch=next(); if(ch=='0') // leading zeros { format_constant.zero_padding=true; ch=next(); } while(isdigit(ch)) // width { format_constant.min_width*=10; format_constant.min_width+=ch-'0'; ch=next(); } if(ch=='.') // precision { format_constant.precision=0; ch=next(); while(isdigit(ch)) { format_constant.precision*=10; format_constant.precision+=ch-'0'; ch=next(); } } switch(ch) { case '%': out << ch; break; case 'e': case 'E': format_constant.style=format_spect::stylet::SCIENTIFIC; if(next_operand==operands.end()) break; out << format_constant( make_type(*(next_operand++), double_type())); break; case 'f': case 'F': format_constant.style=format_spect::stylet::DECIMAL; if(next_operand==operands.end()) break; out << format_constant( make_type(*(next_operand++), double_type())); break; case 'g': case 'G': format_constant.style=format_spect::stylet::AUTOMATIC; if(format_constant.precision==0) format_constant.precision=1; if(next_operand==operands.end()) break; out << format_constant( make_type(*(next_operand++), double_type())); break; case 's': { if(next_operand==operands.end()) break; // this is the address of a string const exprt &op=*(next_operand++); if(op.id()==ID_address_of && op.operands().size()==1 && op.op0().id()==ID_index && op.op0().operands().size()==2 && op.op0().op0().id()==ID_string_constant) out << format_constant(op.op0().op0()); } break; case 'd': if(next_operand==operands.end()) break; out << format_constant( make_type(*(next_operand++), signed_int_type())); break; case 'D': if(next_operand==operands.end()) break; out << format_constant( make_type(*(next_operand++), signed_long_int_type())); break; case 'u': if(next_operand==operands.end()) break; out << format_constant( make_type(*(next_operand++), unsigned_int_type())); break; case 'U': if(next_operand==operands.end()) break; out << format_constant( make_type(*(next_operand++), unsigned_long_int_type())); break; default: out << '%' << ch; } }
void c_typecheck_baset::typecheck_type(typet &type) { // we first convert, and then check { ansi_c_convert_typet ansi_c_convert_type(get_message_handler()); ansi_c_convert_type.read(type); ansi_c_convert_type.write(type); } if(type.id()==ID_already_typechecked) { // need to preserve any qualifiers c_qualifierst c_qualifiers(type); c_qualifiers+=c_qualifierst(type.subtype()); bool packed=type.get_bool(ID_C_packed); exprt alignment=static_cast<const exprt &>(type.find(ID_C_alignment)); irept _typedef=type.find(ID_C_typedef); type=type.subtype(); c_qualifiers.write(type); if(packed) type.set(ID_C_packed, true); if(alignment.is_not_nil()) type.add(ID_C_alignment, alignment); if(_typedef.is_not_nil()) type.add(ID_C_typedef, _typedef); return; // done } // do we have alignment? if(type.find(ID_C_alignment).is_not_nil()) { exprt &alignment=static_cast<exprt &>(type.add(ID_C_alignment)); if(alignment.id()!=ID_default) { typecheck_expr(alignment); make_constant(alignment); } } if(type.id()==ID_code) typecheck_code_type(to_code_type(type)); else if(type.id()==ID_array) typecheck_array_type(to_array_type(type)); else if(type.id()==ID_pointer) typecheck_type(type.subtype()); else if(type.id()==ID_struct || type.id()==ID_union) typecheck_compound_type(to_struct_union_type(type)); else if(type.id()==ID_c_enum) typecheck_c_enum_type(type); else if(type.id()==ID_c_enum_tag) typecheck_c_enum_tag_type(to_c_enum_tag_type(type)); else if(type.id()==ID_c_bit_field) typecheck_c_bit_field_type(to_c_bit_field_type(type)); else if(type.id()==ID_typeof) typecheck_typeof_type(type); else if(type.id()==ID_symbol) typecheck_symbol_type(type); else if(type.id()==ID_vector) typecheck_vector_type(to_vector_type(type)); else if(type.id()==ID_custom_unsignedbv || type.id()==ID_custom_signedbv || type.id()==ID_custom_floatbv || type.id()==ID_custom_fixedbv) typecheck_custom_type(type); else if(type.id()==ID_gcc_attribute_mode) { // get that mode irep_idt mode=type.get(ID_size); // A list of all modes ist at // http://www.delorie.com/gnu/docs/gcc/gccint_53.html typecheck_type(type.subtype()); typet underlying_type=type.subtype(); // gcc allows this, but clang doesn't; it's a compiler hint only, // but we'll try to interpret it the GCC way if(underlying_type.id()==ID_c_enum_tag) { underlying_type= follow_tag(to_c_enum_tag_type(underlying_type)).subtype(); assert(underlying_type.id()==ID_signedbv || underlying_type.id()==ID_unsignedbv); } if(underlying_type.id()==ID_signedbv || underlying_type.id()==ID_unsignedbv) { bool is_signed=underlying_type.id()==ID_signedbv; typet result; if(mode=="__QI__") // 8 bits result=is_signed?signed_char_type():unsigned_char_type(); else if(mode=="__byte__") // 8 bits result=is_signed?signed_char_type():unsigned_char_type(); else if(mode=="__HI__") // 16 bits result=is_signed?signed_short_int_type():unsigned_short_int_type(); else if(mode=="__SI__") // 32 bits result=is_signed?signed_int_type():unsigned_int_type(); else if(mode=="__word__") // long int, we think result=is_signed?signed_long_int_type():unsigned_long_int_type(); else if(mode=="__pointer__") // we think this is size_t/ssize_t result=is_signed?signed_size_type():size_type(); else if(mode=="__DI__") // 64 bits { if(config.ansi_c.long_int_width==64) result=is_signed?signed_long_int_type():unsigned_long_int_type(); else { assert(config.ansi_c.long_long_int_width==64); result= is_signed?signed_long_long_int_type():unsigned_long_long_int_type(); } } else if(mode=="__TI__") // 128 bits result=is_signed?gcc_signed_int128_type():gcc_unsigned_int128_type(); else if(mode=="__V2SI__") // vector of 2 ints, deprecated by gcc result= vector_typet( is_signed?signed_int_type():unsigned_int_type(), from_integer(2, size_type())); else if(mode=="__V4SI__") // vector of 4 ints, deprecated by gcc result= vector_typet( is_signed?signed_int_type():unsigned_int_type(), from_integer(4, size_type())); else // give up, just use subtype result=type.subtype(); // save the location result.add_source_location()=type.source_location(); if(type.subtype().id()==ID_c_enum_tag) { const irep_idt &tag_name= to_c_enum_tag_type(type.subtype()).get_identifier(); symbol_tablet::symbolst::iterator entry= symbol_table.symbols.find(tag_name); assert(entry!=symbol_table.symbols.end()); entry->second.type.subtype()=result; } type=result; } else if(underlying_type.id()==ID_floatbv) { typet result; if(mode=="__SF__") // 32 bits result=float_type(); else if(mode=="__DF__") // 64 bits result=double_type(); else if(mode=="__TF__") // 128 bits result=gcc_float128_type(); else if(mode=="__V2SF__") // vector of 2 floats, deprecated by gcc result=vector_typet(float_type(), from_integer(2, size_type())); else if(mode=="__V2DF__") // vector of 2 doubles, deprecated by gcc result=vector_typet(double_type(), from_integer(2, size_type())); else if(mode=="__V4SF__") // vector of 4 floats, deprecated by gcc result=vector_typet(float_type(), from_integer(4, size_type())); else if(mode=="__V4DF__") // vector of 4 doubles, deprecated by gcc result=vector_typet(double_type(), from_integer(4, size_type())); else // give up, just use subtype result=type.subtype(); // save the location result.add_source_location()=type.source_location(); type=result; } else if(underlying_type.id()==ID_complex) { // gcc allows this, but clang doesn't -- see enums above typet result; if(mode=="__SC__") // 32 bits result=float_type(); else if(mode=="__DC__") // 64 bits result=double_type(); else if(mode=="__TC__") // 128 bits result=gcc_float128_type(); else // give up, just use subtype result=type.subtype(); // save the location result.add_source_location()=type.source_location(); type=complex_typet(result); } else { error().source_location=type.source_location(); error() << "attribute mode `" << mode << "' applied to inappropriate type `" << to_string(type) << "'" << eom; throw 0; } } // do a mild bit of rule checking if(type.get_bool(ID_C_restricted) && type.id()!=ID_pointer && type.id()!=ID_array) { error().source_location=type.source_location(); error() << "only a pointer can be 'restrict'" << eom; throw 0; } }
typet get_type(const format_tokent &token) { switch(token.type) { case format_tokent::INT: switch(token.length_modifier) { case format_tokent::LEN_h: if(token.representation==format_tokent::SIGNED_DEC) return signed_char_type(); else return unsigned_char_type(); case format_tokent::LEN_hh: if(token.representation==format_tokent::SIGNED_DEC) return signed_short_int_type(); else return unsigned_short_int_type(); case format_tokent::LEN_l: if(token.representation==format_tokent::SIGNED_DEC) return signed_long_int_type(); else return unsigned_long_int_type(); case format_tokent::LEN_ll: if(token.representation==format_tokent::SIGNED_DEC) return signed_long_long_int_type(); else return unsigned_long_long_int_type(); default: if(token.representation==format_tokent::SIGNED_DEC) return signed_int_type(); else return unsigned_int_type(); } case format_tokent::FLOAT: switch(token.length_modifier) { case format_tokent::LEN_l: return double_type(); case format_tokent::LEN_L: return long_double_type(); default: return float_type(); } case format_tokent::CHAR: switch(token.length_modifier) { case format_tokent::LEN_l: return wchar_t_type(); default: return char_type(); } case format_tokent::POINTER: return pointer_type(void_type()); case format_tokent::STRING: switch(token.length_modifier) { case format_tokent::LEN_l: return array_typet(wchar_t_type(), nil_exprt()); default: return array_typet(char_type(), nil_exprt()); } default: return nil_typet(); } }