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4.2. SOM: Simple Object Machine
HALT return from the interpreter loop, without changing the interpreter’s
state.
DUP duplicates the element at the top of the operand stack.
POP removes the element from the top of the operand stack.
RETURN_LOCAL performs a return from the current method. The top of the
current frame’s operand stack is saved as return value, the current stack
frame is removed from the interpreter’s stack, and the return value is
then pushed onto the operand stack of the calling method.
RETURN_NON_LOCAL performs a return from a block activation. The top of the
current frame’s operand stack is saved as return value, then all stack
frames from the interpreter’s stack are removed until the end of the
context frame chain is reached, named the target frame; the target frame is
removed, too, and the return value is then pushed onto the top frame’s
operand stack.
PUSH_LOCAL and POP_LOCAL either push or pop the value of a local variable
onto or from the operand stack.
PUSH_ARGUMENT and POP_ARGUMENT either push or pop the value of a method
argument onto or from the operand stack.
PUSH_FIELD and POP_FIELD either push or pop the value of an object’s field
onto or from the operand stack.
PUSH_BLOCK pushes a new block object onto the operand stack. The block
object is initialized to point to the stack frame of the currently-executing
method, so that the block method can access its arguments and locals.
PUSH_CONSTANT pushes a constant value object onto the operand stack.
PUSH_GLOBAL pushes the value of an entry from the global symbol table onto
the operand stack.
SEND and SUPER_SEND send a message to the class or superclass of an object.
The name of the message specifies how many arguments are consumed
from the operand stack. For example, the #ifNil:ifNotNil: message
uses 3 elements: the receiver object and two explicit arguments. Each
send leads to the creation of a new frame, which takes the arguments
and is used for the execution of the corresponding method. Arguments
are popped from the operand stack of the original frame.
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