Class: BlockContext

• Inheritance
• Description
• Related information
• Instance protocol
  • accessing
  • printing & storing

Inheritance:

   Object
   |
   +--Context
      |
      +--BlockContext

Package:

stx:libbasic

Category:

Kernel-Methods

Version:

rev: 1.33 date: 2008/11/05 14:22:16

user: cg

file: BlockContext.st directory: libbasic

module: stx stc-classLibrary: libbasic

Author:

Claus Gittinger

Description:

BlockContexts represent the stack context objects of blocks.
The layout is the same as for other contexts - this class has been added
to avoid a flag in an instance variable.
(has become necessary with cheap blocks, which have no home).

WARNING: layout and size known by compiler and runtime system -
         do not change.

Related information:

    Context
    Block
    Method
    Exception
    Signal

Instance protocol:

 canReturn

return true, if the receiver allows returning through it.
For normal method contexts, this normally returns true;
for blocks, it (currently) always returns false.

 guessedHome

a temporary kludge: optimized block contexts do (currently) not provide
any home info. The code below tries to guess the home.

 home

return the immediate home of the receiver.
normally this is the methodcontext, where the block was created,
for nested block contexts, this is the surrounding blocks context.

 homeReceiver

return the receiver from the context, where the receiver was defined

 isBlockContext

return true, iff the receiver is a BlockContext, false otherwise

 method

return the method in which the current contexts block was created.

 methodHome

return the method-home for block contexts

 selector

return the selector of the context - which is one of the value
selectors. This selector is not found in the context, but synthesized.

 receiverPrintString

return a printString describing the contexts receiver.

Since this is also used by the debugger(s), be very careful to
return something useful, even in case internals of the system
got corrupted ... (i.e. avoid messageNotUnderstood here)