Adrian Prantl 400f1774e9 Add support for a #line directive. ...

This patch extends the syntax with a new #line directive that is inspired
by the homonymous CPP directive. It can be specified in all locations a #if
is legal (Stmt, Decl).

Semantics
---------

#line 42 "file.swift"
This makes diagnostics and debug information behave as if the subsequent
lines came from file.swift+42.

#line // without arguments
This switches back to the main source file and the switches back to the
normal line numbering. Any previous #line directives will result in gaps
in the main file.

Rationale
---------

LLDB and the REPL need this for making expressions that are entered into
the expression evaluator or REPL debugable. For more info see
<rdar://problem/17441710> Need #line directive or something similar so we can enhance the debugging of expressions and REPL

Also, I believe the stdlib would benefit from this and it would allow us
to get rid of the line-directive wrapper script.

Swift SVN r19384

2014-06-30 23:50:11 +00:00

5.6 KiB

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