87 lines
2.9 KiB
Ruby
87 lines
2.9 KiB
Ruby
module Mom
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# As reminder: a statically resolved call (the simplest one) becomes three Mom Instructions.
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# Ie: MessageSetup,ArgumentTransfer,SimpleCall
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#
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# MessageSetup does Setup before a call can be made, acquiring and filling the message
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# basically.Only after MessageSetup is the next_message safe to use.
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#
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# The space keeps a linked list of Messages, from which we take and currenty also return.
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#
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# Message setup set the name to the called method's name, and also set the arg and local
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# types on the new message, currently for debugging but later for dynamic checking
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#
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# The only difference between the setup of a static call and a dynamic one is where
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# the method comes from. A static, or simple call, passes the method, but a dynamic
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# call passes the cache_entry that holds the resolved method.
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#
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# In either case, the method is loaded and name,frame and args set
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#
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class MessageSetup < Instruction
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attr_reader :method_source
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def initialize(method_source)
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@method_source = method_source
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end
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# Move method name, frame and arguemnt types from the method to the next_message
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# Get the message from Space and link it.
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def to_risc(compiler)
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builder = compiler.builder(false)
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build_with(builder)
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end
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# directly called by to_risc
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# but also used directly in __init
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def build_with(builder)
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case from = method_source
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when Parfait::TypedMethod
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builder.build { typed_method << from }
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when Parfait::CacheEntry
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builder.build do
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cache_entry << from
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typed_method << cache_entry[:cached_method]
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end
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else
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raise "unknown source #{method_source}"
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end
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build_message_data(builder)
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return builder.built
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end
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private
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def source
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"method setup "
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end
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# get the next message from space and unlink it there
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# also put it into next_message of current message (and reverse)
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# set name and type data in the message, from the method loaded
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def build_message_data( builder )
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builder.build do
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space << Parfait.object_space
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next_message << space[:first_message]
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message[:next_message] << next_message
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next_message[:caller] << message
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type << typed_method[:arguments_type]
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named_list << next_message[:arguments]
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named_list[:type] << type
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type << typed_method[:frame_type]
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named_list << next_message[:frame]
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named_list[:type] << type
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name << typed_method[:name]
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next_message[:name] << name
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#store next.next back into space
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#FIXME in a multithreaded future this should be done soon after getting
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# the first_message, using lock free compare and swap. Now saving regs
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next_message << next_message[:next_message]
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space[:first_message] << next_message
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end
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end
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end
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end
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