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compiler, runtime: move defer notes to the runtime file

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This seems like the more appropriate place to describe the
implementation of defer.
This commit is contained in:
Ayke van Laethem
2018-11-01 11:42:04 +01:00
parent c7cf6f0e82
commit d7844ce124
2 changed files with 12 additions and 13 deletions
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compiler/calls.go
-13
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@@ -8,19 +8,6 @@ import (
// For a description of the calling convention in prose, see docs/internals.rst
// or the online version of this document:
// https://tinygo.readthedocs.io/en/latest/internals.html#calling-convention
//
// Some further notes:
// * Defer statements are implemented by transforming the function in the
// following way:
// * Creating an alloca in the entry block that contains a pointer
// (initially null) to the linked list of defer frames.
// * Every time a defer statement is executed, a new defer frame is
// created using alloca with a pointer to the previous defer frame, and
// the head pointer in the entry block is replaced with a pointer to
// this defer frame.
// * On return, runtime.rundefers is called which calls all deferred
// functions from the head of the linked list until it has gone through
// all defer frames.
// The maximum number of arguments that can be expanded from a single struct. If
// a struct contains more fields, it is passed as a struct without expanding.