View source code
Display the source code in dmd/toir.d from which this page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Function dmd.toir.buildClosure

Closures are implemented by taking the local variables that need to survive the scope of the function, and copying them into a gc allocated chuck of memory. That chunk, called the closure here, is inserted into the linked list of stack frames instead of the usual stack frame.

extern(C++) void buildClosure (
  FuncDeclaration fd,
  IRState* irs
);

buildClosure() inserts code just after the function prolog is complete. It allocates memory for the closure, allocates a local variable (sclosure) to point to it, inserts into it the link to the enclosing frame, and copies into it the parameters that are referred to in nested functions. In VarExp::toElem and SymOffExp::toElem, when referring to a variable that is in a closure, takes the offset from sclosure rather than from the frame pointer.

getEthis() and NewExp::toElem need to use sclosure, if set, rather than the current frame pointer.

Authors

Walter Bright

License

Boost License 1.0