if (found_anyedge_syncs) {
                        if (found_global_syncs)
-                               log_error("Found non-synthesizable event list at %s:%d!\n", always->filename.c_str(), always->linenum);
+                               log_file_error(always->filename, always->linenum, "Found non-synthesizable event list!\n");
                        log("Note: Assuming pure combinatorial block at %s:%d in\n", always->filename.c_str(), always->linenum);
                        log("compliance with IEC 62142(E):2005 / IEEE Std. 1364.1(E):2002. Recommending\n");
                        log("use of @* instead of @(...) for better match of synthesis and simulation.\n");
                                        continue;
                                found_clocked_sync = true;
                                if (found_global_syncs || found_anyedge_syncs)
-                                       log_error("Found non-synthesizable event list at %s:%d!\n", always->filename.c_str(), always->linenum);
+                                       log_file_error(always->filename, always->linenum, "Found non-synthesizable event list!\n");
                                RTLIL::SyncRule *syncrule = new RTLIL::SyncRule;
                                syncrule->type = child->type == AST_POSEDGE ? RTLIL::STp : RTLIL::STn;
                                syncrule->signal = child->children[0]->genRTLIL();
                                if (GetSize(syncrule->signal) != 1)
-                                       log_error("Found posedge/negedge event on a signal that is not 1 bit wide at %s:%d!\n", always->filename.c_str(), always->linenum);
+                                       log_file_error(always->filename, always->linenum, "Found posedge/negedge event on a signal that is not 1 bit wide!\n");
                                addChunkActions(syncrule->actions, subst_lvalue_from, subst_lvalue_to, true);
                                proc->syncs.push_back(syncrule);
                        }
                        break;
 
                case AST_WIRE:
-                       log_error("Found wire declaration in block without label at at %s:%d!\n", ast->filename.c_str(), ast->linenum);
+                       log_file_error(ast->filename, ast->linenum, "Found wire declaration in block without label!\n");
                        break;
 
                case AST_PARAMETER:
                case AST_LOCALPARAM:
-                       log_error("Found parameter declaration in block without label at at %s:%d!\n", ast->filename.c_str(), ast->linenum);
+                       log_file_error(ast->filename, ast->linenum, "Found parameter declaration in block without label!\n");
                        break;
 
                case AST_NONE:
                if (id_ast == NULL && current_scope.count(str))
                        id_ast = current_scope.at(str);
                if (!id_ast)
-                       log_error("Failed to resolve identifier %s for width detection at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Failed to resolve identifier %s for width detection!\n", str.c_str());
                if (id_ast->type == AST_PARAMETER || id_ast->type == AST_LOCALPARAM) {
                        if (id_ast->children.size() > 1 && id_ast->children[1]->range_valid) {
                                this_width = id_ast->children[1]->range_left - id_ast->children[1]->range_right + 1;
                        if (id_ast->children[0]->type == AST_CONSTANT)
                                this_width = id_ast->children[0]->bits.size();
                        else
-                               log_error("Failed to detect width for parameter %s at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Failed to detect width for parameter %s!\n", str.c_str());
                        if (children.size() != 0)
                                range = children[0];
                } else if (id_ast->type == AST_WIRE || id_ast->type == AST_AUTOWIRE) {
                                        // log("---\n");
                                        // id_ast->dumpAst(NULL, "decl> ");
                                        // dumpAst(NULL, "ref> ");
-                                       log_error("Failed to detect width of signal access `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Failed to detect width of signal access `%s'!\n", str.c_str());
                                }
                        } else {
                                this_width = id_ast->range_left - id_ast->range_right + 1;
                        this_width = 32;
                } else if (id_ast->type == AST_MEMORY) {
                        if (!id_ast->children[0]->range_valid)
-                               log_error("Failed to detect width of memory access `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Failed to detect width of memory access `%s'!\n", str.c_str());
                        this_width = id_ast->children[0]->range_left - id_ast->children[0]->range_right + 1;
                } else
-                       log_error("Failed to detect width for identifier %s at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Failed to detect width for identifier %s!\n", str.c_str());
                if (range) {
                        if (range->children.size() == 1)
                                this_width = 1;
        case AST_TO_BITS:
                while (children[0]->simplify(true, false, false, 1, -1, false, false) == true) { }
                if (children[0]->type != AST_CONSTANT)
-                       log_error("Left operand of tobits expression is not constant at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Left operand of tobits expression is not constant!\n");
                children[1]->detectSignWidthWorker(sub_width_hint, sign_hint);
                width_hint = max(width_hint, children[0]->bitsAsConst().as_int());
                break;
        case AST_REPLICATE:
                while (children[0]->simplify(true, false, false, 1, -1, false, true) == true) { }
                if (children[0]->type != AST_CONSTANT)
-                       log_error("Left operand of replicate expression is not constant at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Left operand of replicate expression is not constant!\n");
                children[1]->detectSignWidthWorker(sub_width_hint, sub_sign_hint);
                width_hint = max(width_hint, children[0]->bitsAsConst().as_int() * sub_width_hint);
                sign_hint = false;
                if (!id2ast->is_signed)
                        sign_hint = false;
                if (!id2ast->children[0]->range_valid)
-                       log_error("Failed to detect width of memory access `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Failed to detect width of memory access `%s'!\n", str.c_str());
                this_width = id2ast->children[0]->range_left - id2ast->children[0]->range_right + 1;
                width_hint = max(width_hint, this_width);
                break;
                        RTLIL::SigSpec left = children[0]->genRTLIL();
                        RTLIL::SigSpec right = children[1]->genRTLIL();
                        if (!left.is_fully_const())
-                               log_error("Left operand of replicate expression is not constant at %s:%d!\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Left operand of replicate expression is not constant!\n");
                        int count = left.as_int();
                        RTLIL::SigSpec sig;
                        for (int i = 0; i < count; i++)
                        int num_words = 1;
                        if (type == AST_MEMINIT) {
                                if (children[2]->type != AST_CONSTANT)
-                                       log_error("Memory init with non-constant word count at %s:%d!\n", filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Memory init with non-constant word count!\n");
                                num_words = int(children[2]->asInt(false));
                                cell->parameters["\\WORDS"] = RTLIL::Const(num_words);
                        }
                                if (attributes.count("\\reg")) {
                                        auto &attr = attributes.at("\\reg");
                                        if (attr->type != AST_CONSTANT)
-                                               log_error("Attribute `reg' with non-constant value at %s:%d!\n", filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Attribute `reg' with non-constant value!\n");
                                        cell->attributes["\\reg"] =  attr->asAttrConst();
                                }
 
 
        // note that $display, $finish, and $stop are used for synthesis-time DRC so they're not in this list
        if ((type == AST_FCALL || type == AST_TCALL) && (str == "$strobe" || str == "$monitor" || str == "$time" ||
                        str == "$dumpfile" || str == "$dumpvars" || str == "$dumpon" || str == "$dumpoff" || str == "$dumpall")) {
-               log_warning("Ignoring call to system %s %s at %s:%d.\n", type == AST_FCALL ? "function" : "task", str.c_str(), filename.c_str(), linenum);
+               log_file_warning(filename, linenum, "Ignoring call to system %s %s.\n", type == AST_FCALL ? "function" : "task", str.c_str());
                delete_children();
                str = std::string();
        }
 
        if ((type == AST_TCALL) && (str == "$display" || str == "$write") && (!current_always || current_always->type != AST_INITIAL)) {
-               log_warning("System task `%s' outside initial block is unsupported at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+               log_file_warning(filename, linenum, "System task `%s' outside initial block is unsupported.\n", str.c_str());
                delete_children();
                str = std::string();
        }
                AstNode *node_string = children[0];
                while (node_string->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                if (node_string->type != AST_CONSTANT)
-                       log_error("Failed to evaluate system task `%s' with non-constant 1st argument at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Failed to evaluate system task `%s' with non-constant 1st argument.\n", str.c_str());
                std::string sformat = node_string->bitsAsConst().decode_string();
 
                // Other arguments are placeholders. Process the string as we go through it
                        {
                                // If there's no next character, that's a problem
                                if (i+1 >= sformat.length())
-                                       log_error("System task `%s' called with `%%' at end of string at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "System task `%s' called with `%%' at end of string.\n", str.c_str());
 
                                char cformat = sformat[++i];
 
                                                node_arg = children[next_arg++];
                                                while (node_arg->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                                                if (node_arg->type != AST_CONSTANT)
-                                                       log_error("Failed to evaluate system task `%s' with non-constant argument at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                                       log_file_error(filename, linenum, "Failed to evaluate system task `%s' with non-constant argument.\n", str.c_str());
                                                break;
 
                                        case 'm':
                                                break;
 
                                        default:
-                                               log_error("System task `%s' called with invalid/unsupported format specifier at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "System task `%s' called with invalid/unsupported format specifier.\n", str.c_str());
                                                break;
                                }
 
                                        continue;
                                wires_are_incompatible:
                                        if (stage > 1)
-                                               log_error("Incompatible re-declaration of wire %s at %s:%d.\n", node->str.c_str(), filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Incompatible re-declaration of wire %s.\n", node->str.c_str());
                                        continue;
                                }
                                this_wire_scope[node->str] = node;
        if (type == AST_ALWAYS || type == AST_INITIAL)
        {
                if (current_always != nullptr)
-                       log_error("Invalid nesting of always blocks and/or initializations at %s:%d.\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Invalid nesting of always blocks and/or initializations.\n");
 
                current_always = this;
                current_always_clocked = false;
                        while (!children[1]->basic_prep && children[1]->simplify(false, false, false, stage, -1, false, true) == true)
                                did_something = true;
                        if (!children[1]->range_valid)
-                               log_error("Non-constant width range on parameter decl at %s:%d.\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Non-constant width range on parameter decl.\n");
                        width_hint = max(width_hint, children[1]->range_left - children[1]->range_right + 1);
                }
                break;
        if (type == AST_DEFPARAM && !children.empty())
        {
                if (children[0]->type != AST_IDENTIFIER)
-                       log_error("Module name in defparam at %s:%d contains non-constant expressions!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Module name in defparam contains non-constant expressions!\n");
 
                string modname, paramname = children[0]->str;
 
                }
 
                if (pos == std::string::npos)
-                       log_error("Can't find object for defparam `%s` at %s:%d!\n", RTLIL::unescape_id(paramname).c_str(), filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Can't find object for defparam `%s`!\n", RTLIL::unescape_id(paramname).c_str());
 
                paramname = "\\" + paramname.substr(pos+1);
 
        if (type == AST_PREFIX) {
                if (children[0]->type != AST_CONSTANT) {
                        // dumpAst(NULL, ">   ");
-                       log_error("Index in generate block prefix syntax at %s:%d is not constant!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Index in generate block prefix syntax is not constant!\n");
                }
                if (children[1]->type == AST_PREFIX)
                        children[1]->simplify(const_fold, at_zero, in_lvalue, stage, width_hint, sign_hint, in_param);
        // evaluate TO_BITS nodes
        if (type == AST_TO_BITS) {
                if (children[0]->type != AST_CONSTANT)
-                       log_error("Left operand of to_bits expression is not constant at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Left operand of to_bits expression is not constant!\n");
                if (children[1]->type != AST_CONSTANT)
-                       log_error("Right operand of to_bits expression is not constant at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Right operand of to_bits expression is not constant!\n");
                RTLIL::Const new_value = children[1]->bitsAsConst(children[0]->bitsAsConst().as_int(), children[1]->is_signed);
                newNode = mkconst_bits(new_value.bits, children[1]->is_signed);
                goto apply_newNode;
                multirange_dimensions.clear();
                for (auto range : children[1]->children) {
                        if (!range->range_valid)
-                               log_error("Non-constant range on memory decl at %s:%d.\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Non-constant range on memory decl.\n");
                        multirange_dimensions.push_back(min(range->range_left, range->range_right));
                        multirange_dimensions.push_back(max(range->range_left, range->range_right) - min(range->range_left, range->range_right) + 1);
                        total_size *= multirange_dimensions.back();
                for (int i = 0; 2*i < GetSize(id2ast->multirange_dimensions); i++)
                {
                        if (GetSize(children[0]->children) < i)
-                               log_error("Insufficient number of array indices for %s at %s:%d.\n", log_id(str), filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Insufficient number of array indices for %s.\n", log_id(str));
 
                        AstNode *new_index_expr = children[0]->children[i]->children.at(0)->clone();
 
        if (type == AST_PARAMETER || type == AST_LOCALPARAM) {
                if (children.size() > 1 && children[1]->type == AST_RANGE) {
                        if (!children[1]->range_valid)
-                               log_error("Non-constant width range on parameter decl at %s:%d.\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Non-constant width range on parameter decl.\n");
                        int width = std::abs(children[1]->range_left - children[1]->range_right) + 1;
                        if (children[0]->type == AST_REALVALUE) {
                                RTLIL::Const constvalue = children[0]->realAsConst(width);
        if (type == AST_IDENTIFIER && children.size() == 2 && children[0]->type == AST_RANGE && children[1]->type == AST_RANGE && !in_lvalue)
        {
                if (id2ast == NULL || id2ast->type != AST_MEMORY || children[0]->children.size() != 1)
-                       log_error("Invalid bit-select on memory access at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Invalid bit-select on memory access!\n");
 
                int mem_width, mem_size, addr_bits;
                id2ast->meminfo(mem_width, mem_size, addr_bits);
        }
 
        if (type == AST_WHILE)
-               log_error("While loops are only allowed in constant functions at %s:%d!\n", filename.c_str(), linenum);
+               log_file_error(filename, linenum, "While loops are only allowed in constant functions!\n");
 
        if (type == AST_REPEAT)
-               log_error("Repeat loops are only allowed in constant functions at %s:%d!\n", filename.c_str(), linenum);
+               log_file_error(filename, linenum, "Repeat loops are only allowed in constant functions!\n");
 
        // unroll for loops and generate-for blocks
        if ((type == AST_GENFOR || type == AST_FOR) && children.size() != 0)
                        body_ast = body_ast->children.at(0);
 
                if (init_ast->type != AST_ASSIGN_EQ)
-                       log_error("Unsupported 1st expression of generate for-loop at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Unsupported 1st expression of generate for-loop!\n");
                if (next_ast->type != AST_ASSIGN_EQ)
-                       log_error("Unsupported 3rd expression of generate for-loop at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Unsupported 3rd expression of generate for-loop!\n");
 
                if (type == AST_GENFOR) {
                        if (init_ast->children[0]->id2ast == NULL || init_ast->children[0]->id2ast->type != AST_GENVAR)
-                               log_error("Left hand side of 1st expression of generate for-loop at %s:%d is not a gen var!\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Left hand side of 1st expression of generate for-loop is not a gen var!\n");
                        if (next_ast->children[0]->id2ast == NULL || next_ast->children[0]->id2ast->type != AST_GENVAR)
-                               log_error("Left hand side of 3rd expression of generate for-loop at %s:%d is not a gen var!\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Left hand side of 3rd expression of generate for-loop is not a gen var!\n");
                } else {
                        if (init_ast->children[0]->id2ast == NULL || init_ast->children[0]->id2ast->type != AST_WIRE)
-                               log_error("Left hand side of 1st expression of generate for-loop at %s:%d is not a register!\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Left hand side of 1st expression of generate for-loop is not a register!\n");
                        if (next_ast->children[0]->id2ast == NULL || next_ast->children[0]->id2ast->type != AST_WIRE)
-                               log_error("Left hand side of 3rd expression of generate for-loop at %s:%d is not a register!\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Left hand side of 3rd expression of generate for-loop is not a register!\n");
                }
 
                if (init_ast->children[0]->id2ast != next_ast->children[0]->id2ast)
-                       log_error("Incompatible left-hand sides in 1st and 3rd expression of generate for-loop at %s:%d!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Incompatible left-hand sides in 1st and 3rd expression of generate for-loop!\n");
 
                // eval 1st expression
                AstNode *varbuf = init_ast->children[1]->clone();
                while (varbuf->simplify(true, false, false, stage, 32, true, false)) { }
 
                if (varbuf->type != AST_CONSTANT)
-                       log_error("Right hand side of 1st expression of generate for-loop at %s:%d is not constant!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Right hand side of 1st expression of generate for-loop is not constant!\n");
 
                varbuf = new AstNode(AST_LOCALPARAM, varbuf);
                varbuf->str = init_ast->children[0]->str;
                        while (buf->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
 
                        if (buf->type != AST_CONSTANT)
-                               log_error("2nd expression of generate for-loop at %s:%d is not constant!\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "2nd expression of generate for-loop is not constant!\n");
 
                        if (buf->integer == 0) {
                                delete buf;
                        while (buf->simplify(true, false, false, stage, 32, true, false)) { }
 
                        if (buf->type != AST_CONSTANT)
-                               log_error("Right hand side of 3rd expression of generate for-loop at %s:%d is not constant!\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Right hand side of 3rd expression of generate for-loop is not constant!\n");
 
                        delete varbuf->children[0];
                        varbuf->children[0] = buf;
                if (buf->type != AST_CONSTANT) {
                        // for (auto f : log_files)
                        //      dumpAst(f, "verilog-ast> ");
-                       log_error("Condition for generate if at %s:%d is not constant!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Condition for generate if is not constant!\n");
                }
                if (buf->asBool() != 0) {
                        delete buf;
                if (buf->type != AST_CONSTANT) {
                        // for (auto f : log_files)
                        //      dumpAst(f, "verilog-ast> ");
-                       log_error("Condition for generate case at %s:%d is not constant!\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Condition for generate case is not constant!\n");
                }
 
                bool ref_signed = buf->is_signed;
                                if (buf->type != AST_CONSTANT) {
                                        // for (auto f : log_files)
                                        //      dumpAst(f, "verilog-ast> ");
-                                       log_error("Expression in generate case at %s:%d is not constant!\n", filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Expression in generate case is not constant!\n");
                                }
 
                                bool is_selected = RTLIL::const_eq(ref_value, buf->bitsAsConst(), ref_signed && buf->is_signed, ref_signed && buf->is_signed, 1).as_bool();
        if (type == AST_CELLARRAY)
        {
                if (!children.at(0)->range_valid)
-                       log_error("Non-constant array range on cell array at %s:%d.\n", filename.c_str(), linenum);
+                       log_file_error(filename, linenum, "Non-constant array range on cell array.\n");
 
                newNode = new AstNode(AST_GENBLOCK);
                int num = max(children.at(0)->range_left, children.at(0)->range_right) - min(children.at(0)->range_left, children.at(0)->range_right) + 1;
                        newNode->children.push_back(new_cell);
                        new_cell->str += stringf("[%d]", idx);
                        if (new_cell->type == AST_PRIMITIVE) {
-                               log_error("Cell arrays of primitives are currently not supported at %s:%d.\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Cell arrays of primitives are currently not supported.\n");
                        } else {
                                log_assert(new_cell->children.at(0)->type == AST_CELLTYPE);
                                new_cell->children.at(0)->str = stringf("$array:%d:%d:%s", i, num, new_cell->children.at(0)->str.c_str());
                                while (left_at_zero_ast->simplify(true, true, false, 1, -1, false, false)) { }
                                while (right_at_zero_ast->simplify(true, true, false, 1, -1, false, false)) { }
                                if (left_at_zero_ast->type != AST_CONSTANT || right_at_zero_ast->type != AST_CONSTANT)
-                                       log_error("Unsupported expression on dynamic range select on signal `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Unsupported expression on dynamic range select on signal `%s'!\n", str.c_str());
                                int width = left_at_zero_ast->integer - right_at_zero_ast->integer + 1;
 
                                assign_data = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER),
                                        AstNode *buf = children[1]->clone();
                                        while (buf->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                                        if (buf->type != AST_CONSTANT)
-                                               log_error("Failed to evaluate system function `%s' with non-constant value at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Failed to evaluate system function `%s' with non-constant value.\n", str.c_str());
 
                                        num_steps = buf->asInt(true);
                                        delete buf;
                                AstNode *buf = children[0]->clone();
                                while (buf->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                                if (buf->type != AST_CONSTANT)
-                                       log_error("Failed to evaluate system function `%s' with non-constant value at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Failed to evaluate system function `%s' with non-constant value.\n", str.c_str());
 
                                RTLIL::Const arg_value = buf->bitsAsConst();
                                if (arg_value.as_bool())
                                        if (id_ast == NULL && current_scope.count(buf->str))
                                                id_ast = current_scope.at(buf->str);
                                        if (!id_ast)
-                                               log_error("Failed to resolve identifier %s for width detection at %s:%d!\n", buf->str.c_str(), filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Failed to resolve identifier %s for width detection!\n", buf->str.c_str());
                                        if (id_ast->type == AST_MEMORY) {
                                                // We got here only if the argument is a memory
                                                // Otherwise $size() and $bits() return the expression width
                                                if (str == "\\$bits") {
                                                        if (mem_range->type == AST_RANGE) {
                                                                if (!mem_range->range_valid)
-                                                                       log_error("Failed to detect width of memory access `%s' at %s:%d!\n", buf->str.c_str(), filename.c_str(), linenum);
+                                                                       log_file_error(filename, linenum, "Failed to detect width of memory access `%s'!\n", buf->str.c_str());
                                                                mem_depth = mem_range->range_left - mem_range->range_right + 1;
                                                        } else
-                                                               log_error("Unknown memory depth AST type in `%s' at %s:%d!\n", buf->str.c_str(), filename.c_str(), linenum);
+                                                               log_file_error(filename, linenum, "Unknown memory depth AST type in `%s'!\n", buf->str.c_str());
                                                } else {
                                                        // $size()
                                                        if (mem_range->type == AST_RANGE) {
                                                                if (!mem_range->range_valid)
-                                                                       log_error("Failed to detect width of memory access `%s' at %s:%d!\n", buf->str.c_str(), filename.c_str(), linenum);
+                                                                       log_file_error(filename, linenum, "Failed to detect width of memory access `%s'!\n", buf->str.c_str());
                                                                int dims;
                                                                if (id_ast->multirange_dimensions.empty())
                                                                        dims = 1;
                                                                else if (dim <= dims) {
                                                                        width_hint = id_ast->multirange_dimensions[2*dim-1];
                                                                } else if ((dim > dims+1) || (dim < 0))
-                                                                       log_error("Dimension %d out of range in `%s', as it only has dimensions 1..%d at %s:%d!\n", dim, buf->str.c_str(), dims+1, filename.c_str(), linenum);
+                                                                       log_file_error(filename, linenum, "Dimension %d out of range in `%s', as it only has dimensions 1..%d!\n", dim, buf->str.c_str(), dims+1);
                                                        } else
-                                                               log_error("Unknown memory depth AST type in `%s' at %s:%d!\n", buf->str.c_str(), filename.c_str(), linenum);
+                                                               log_file_error(filename, linenum, "Unknown memory depth AST type in `%s'!\n", buf->str.c_str());
                                                }
                                        }
                                }
                                for (int i = 2; i < GetSize(dpi_decl->children); i++)
                                {
                                        if (i-2 >= GetSize(children))
-                                               log_error("Insufficient number of arguments in DPI function call at %s:%d.\n", filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Insufficient number of arguments in DPI function call.\n");
 
                                        argtypes.push_back(RTLIL::unescape_id(dpi_decl->children.at(i)->str));
                                        args.push_back(children.at(i-2)->clone());
                                        while (args.back()->simplify(true, false, false, stage, -1, false, true)) { }
 
                                        if (args.back()->type != AST_CONSTANT && args.back()->type != AST_REALVALUE)
-                                               log_error("Failed to evaluate DPI function with non-constant argument at %s:%d.\n", filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Failed to evaluate DPI function with non-constant argument.\n");
                                }
 
                                newNode = dpi_call(rtype, fname, argtypes, args);
                        }
 
                        if (current_scope.count(str) == 0 || current_scope[str]->type != AST_FUNCTION)
-                               log_error("Can't resolve function name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Can't resolve function name `%s'.\n", str.c_str());
                }
 
                if (type == AST_TCALL)
                        if (str == "$finish" || str == "$stop")
                        {
                                if (!current_always || current_always->type != AST_INITIAL)
-                                       log_error("System task `%s' outside initial block is unsupported at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "System task `%s' outside initial block is unsupported.\n", str.c_str());
 
-                               log_error("System task `%s' executed at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "System task `%s' executed.\n", str.c_str());
                        }
 
                        if (str == "\\$readmemh" || str == "\\$readmemb")
                                AstNode *node_filename = children[0]->clone();
                                while (node_filename->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                                if (node_filename->type != AST_CONSTANT)
-                                       log_error("Failed to evaluate system function `%s' with non-constant 1st argument at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Failed to evaluate system function `%s' with non-constant 1st argument.\n", str.c_str());
 
                                AstNode *node_memory = children[1]->clone();
                                while (node_memory->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                                if (node_memory->type != AST_IDENTIFIER || node_memory->id2ast == nullptr || node_memory->id2ast->type != AST_MEMORY)
-                                       log_error("Failed to evaluate system function `%s' with non-memory 2nd argument at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Failed to evaluate system function `%s' with non-memory 2nd argument.\n", str.c_str());
 
                                int start_addr = -1, finish_addr = -1;
 
                                        AstNode *node_addr = children[2]->clone();
                                        while (node_addr->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                                        if (node_addr->type != AST_CONSTANT)
-                                               log_error("Failed to evaluate system function `%s' with non-constant 3rd argument at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Failed to evaluate system function `%s' with non-constant 3rd argument.\n", str.c_str());
                                        start_addr = int(node_addr->asInt(false));
                                }
 
                                        AstNode *node_addr = children[3]->clone();
                                        while (node_addr->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
                                        if (node_addr->type != AST_CONSTANT)
-                                               log_error("Failed to evaluate system function `%s' with non-constant 4th argument at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                                               log_file_error(filename, linenum, "Failed to evaluate system function `%s' with non-constant 4th argument.\n", str.c_str());
                                        finish_addr = int(node_addr->asInt(false));
                                }
 
                        }
 
                        if (current_scope.count(str) == 0 || current_scope[str]->type != AST_TASK)
-                               log_error("Can't resolve task name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Can't resolve task name `%s'.\n", str.c_str());
                }
 
                AstNode *decl = current_scope[str];
                        }
 
                        if (in_param)
-                               log_error("Non-constant function call in constant expression at %s:%d.\n", filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Non-constant function call in constant expression.\n");
                        if (require_const_eval)
-                               log_error("Function %s can only be called with constant arguments at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
+                               log_file_error(filename, linenum, "Function %s can only be called with constant arguments.\n", str.c_str());
                }
 
                size_t arg_count = 0;
                                                                        goto tcall_incompatible_wires;
                                                } else {
                                        tcall_incompatible_wires:
-                                                       log_error("Incompatible re-declaration of wire %s at %s:%d.\n", child->str.c_str(), filename.c_str(), linenum);
+                                                       log_file_error(filename, linenum, "Incompatible re-declaration of wire %s.\n", child->str.c_str());
                                                }
                                        }
                                }
        yosys_input_files.insert(mem_filename);
 
        if (f.fail())
-               log_error("Can not open file `%s` for %s at %s:%d.\n", mem_filename.c_str(), str.c_str(), filename.c_str(), linenum);
+               log_file_error(filename, linenum, "Can not open file `%s` for %s.\n", mem_filename.c_str(), str.c_str());
 
        log_assert(GetSize(memory->children) == 2 && memory->children[1]->type == AST_RANGE && memory->children[1]->range_valid);
        int range_left =  memory->children[1]->range_left, range_right =  memory->children[1]->range_right;
                                char *endptr;
                                cursor = strtol(nptr, &endptr, 16);
                                if (!*nptr || *endptr)
-                                       log_error("Can not parse address `%s` for %s at %s:%d.\n", nptr, str.c_str(), filename.c_str(), linenum);
+                                       log_file_error(filename, linenum, "Can not parse address `%s` for %s.\n", nptr, str.c_str());
                                continue;
                        }
 
                return false;
 
        if (children.empty() || children[0]->type != AST_RANGE || GetSize(children[0]->children) != 1)
-               log_error("Invalid array access at %s:%d.\n", filename.c_str(), linenum);
+               log_file_error(filename, linenum, "Invalid array access.\n");
 
        return true;
 }
 }
 
 YOSYS_NAMESPACE_END
-