main(int argc, char *argv[]) { node gnd; node n1("n1"); node n2("n2"); node n3("n3"); node n4("n4"); node n5("n5"); node n6("n6"); vdc vcc("vcc", n6, gnd, 5.0); vpulse vin("vin", n1, gnd, 0, 5, 2e-9, 2e-9, 2e-9, 10e-9); r rb1("rb1", n1, n2, 10e3); r rc1("rc1", n6, n3, 1e3); qnd q1("q1", n3, n2, gnd); r rb2("rb2", n3, n4, 10e3); qnd q2("q2", n5, n4, gnd); r rc2("rc2", n6, n5, 1e3); op::monitor = 1; op(); plot::output = *argv; plot::add("n1", "n3", "n5"); tran::tsmin = 1.0e-30; tran::monitor = 1; tran(0.2e-9, 20.0e-9); }
void goto_symext::symex_step( const goto_functionst &goto_functions, statet &state) { #if 0 std::cout << "\ninstruction type is " << state.source.pc->type << '\n'; std::cout << "Location: " << state.source.pc->source_location << '\n'; std::cout << "Guard: " << from_expr(ns, "", state.guard.as_expr()) << '\n'; std::cout << "Code: " << from_expr(ns, "", state.source.pc->code) << '\n'; #endif assert(!state.threads.empty()); assert(!state.call_stack().empty()); const goto_programt::instructiont &instruction=*state.source.pc; merge_gotos(state); // depth exceeded? { unsigned max_depth=options.get_unsigned_int_option("depth"); if(max_depth!=0 && state.depth>max_depth) state.guard.add(false_exprt()); state.depth++; } // actually do instruction switch(instruction.type) { case SKIP: if(!state.guard.is_false()) target.location(state.guard.as_expr(), state.source); state.source.pc++; break; case END_FUNCTION: // do even if state.guard.is_false() to clear out frame created // in symex_start_thread symex_end_of_function(state); state.source.pc++; break; case LOCATION: if(!state.guard.is_false()) target.location(state.guard.as_expr(), state.source); state.source.pc++; break; case GOTO: symex_goto(state); break; case ASSUME: if(!state.guard.is_false()) { exprt tmp=instruction.guard; clean_expr(tmp, state, false); state.rename(tmp, ns); symex_assume(state, tmp); } state.source.pc++; break; case ASSERT: if(!state.guard.is_false()) { std::string msg=id2string(state.source.pc->source_location.get_comment()); if(msg=="") msg="assertion"; exprt tmp(instruction.guard); clean_expr(tmp, state, false); vcc(tmp, msg, state); } state.source.pc++; break; case RETURN: if(!state.guard.is_false()) return_assignment(state); state.source.pc++; break; case ASSIGN: if(!state.guard.is_false()) symex_assign_rec(state, to_code_assign(instruction.code)); state.source.pc++; break; case FUNCTION_CALL: if(!state.guard.is_false()) { code_function_callt deref_code= to_code_function_call(instruction.code); if(deref_code.lhs().is_not_nil()) clean_expr(deref_code.lhs(), state, true); clean_expr(deref_code.function(), state, false); Forall_expr(it, deref_code.arguments()) clean_expr(*it, state, false); symex_function_call(goto_functions, state, deref_code); } else state.source.pc++; break; case OTHER: if(!state.guard.is_false()) symex_other(goto_functions, state); state.source.pc++; break; case DECL: if(!state.guard.is_false()) symex_decl(state); state.source.pc++; break; case DEAD: symex_dead(state); state.source.pc++; break; case START_THREAD: symex_start_thread(state); state.source.pc++; break; case END_THREAD: // behaves like assume(0); if(!state.guard.is_false()) state.guard.add(false_exprt()); state.source.pc++; break; case ATOMIC_BEGIN: symex_atomic_begin(state); state.source.pc++; break; case ATOMIC_END: symex_atomic_end(state); state.source.pc++; break; case CATCH: symex_catch(state); state.source.pc++; break; case THROW: symex_throw(state); state.source.pc++; break; case NO_INSTRUCTION_TYPE: throw "symex got NO_INSTRUCTION"; default: throw "symex got unexpected instruction"; } }