parse_tree

NODE_TERNARY_OP:
    l.expr: first arg
    r.expr: NODE_BINARY_OP

NODE_BINARY_OP:
    v.number: opcode
    l.expr, r.expr: arguments

NODE_UNARY_OP:
    v.number: opcode
    r.expr: argument

NODE_OPCODE:
    v.number: opcode

NODE_OPCODE_1:
    v.number: opcode
    l.number: param

NODE_OPCODE_2:
    v.number: opcode
    l.number: param1
    r.number: param2

NODE_UNARY_OP_1:
    r.expr: argument
    v.number: opcode
    l.number: param

NODE_BINARY_OP_1:
    r.expr, l.expr: args
    v.number: opcode
    type: param

NODE_TERNARY_OP_1:
    l.expr: first arg
    r.expr: NODE_BINARY_OP
    type: param

NODE_RETURN:
    r.expr: return value (may be zero)

NODE_LAND_LOR:
    l.expr, r.expr: expressions
    v.number: F_LAND, F_LOR

NODE_BRANCH_LINK:
    l.expr, r.expr: expressions

NODE_CALL, NODE_CALL_1:
    r.expr: expr_list
    v.number: opcode
    l.number: param (short)

NODE_CALL_2:
    r.expr: expr_list
    v.number: opcode
    l.number: param2 << 16 + param (short)

NODE_TWO_VALUES:
    l.expr, r.expr: two values ;)

NODE_CONTROL_JUMP:
    v.number: (CJ_BREAK, CJ_BREAK_SWITCH, CJ_CONTINUE)

NODE_PARAMETER:
    v.number: index

NODE_PARAMETER_LVALUE:
    v.number: index

NODE_IF:
    v.expr: condition
    l.expr: statement
    r.expr: else statement

NODE_LOOP:
    type: if non-zero, do test at top of loop
    v.expr: block
    l.expr: inc
    r.expr: test

NODE_FOREACH:
    l.expr: first var
    r.expr: second var, or zero
    v.expr: the expression

NODE_LVALUE_EFUN:
    l.expr: binary/ternary expression with builtin args
    r.expr: lvalue list

NODE_EFUN:
    r.expr: expr_list
    v.number: opcode    ( + 1024 if void valued efun is used)
    l.number: num args