Call location: src_file() and src_line()

Status: implemented.

A log line wants the file and the line of the call that wrote it. The parser already stores that on the call (Line, from Parser::CurLine). Codegen emits it as a constant, so inlining the function that received the value cannot move it. There is no macro and no stack walk.

Defaults

A default is parsed in the function that declares it. AddParamDefaults clones that expression into the call, and the clone keeps the declaration's Line. A src_file() written as a default would then name the function's own file.

The clone is checked in InParamDefault, whose frame records the call that left the argument out (Frame::callline). When that check resolves a call to the src_file or src_line builtin, CheckBuiltin sets the call's Line from the innermost parameter-default frame (EachDefaultInPlace follows where the call was written, not a body checked from the default). A function of the same spelling is not the builtin, so its line stays where it was parsed. CheckCall drops the inserted defaults and clones them again on the next check, so this runs on every insertion.

fn info(text: u8[:], file: u8[:] = src_file(), row: i64 = src_line()) {}

info("filled") on line 4 of fill.goose is info("filled", "fill.goose", 4). An argument the caller writes is kept.

The file string

src_file() is the base name, the last path segment. Runtime aborts print the path CodeGen::FileRef stored, one static per source file. A log line does not: that path is whatever the compiler loaded, a home directory or a checkout, and it would be baked into the binary. The base name is one static per distinct string (StrRaw), shared by every call that names it. Two source files with the same base name are not distinguished. The column stays in the compiler.