Class: RedShift::DelayFlow
- Defined in:
- lib/redshift/component.rb,
lib/redshift/target/c/flow/delay.rb
Constant Summary
Constants inherited from Flow
Instance Attribute Summary collapse
-
#delay_by ⇒ Object
readonly
Returns the value of attribute delay_by.
Attributes inherited from Flow
#fname, #formula, #generator, #inspect_str, #strict, #var
Instance Method Summary collapse
-
#initialize(v, f, delay_by) ⇒ DelayFlow
constructor
A new instance of DelayFlow.
- #make_generator(cl, state) ⇒ Object
Methods inherited from Flow
#become_generatable, #external_constant?, #generate, #inspect, #make_ct_struct, #translate, #translate_link, #wrapper
Constructor Details
#initialize(v, f, delay_by) ⇒ DelayFlow
Returns a new instance of DelayFlow.
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# File 'lib/redshift/component.rb', line 119 def initialize v, f, delay_by super(v, f) @delay_by = delay_by end |
Instance Attribute Details
#delay_by ⇒ Object (readonly)
Returns the value of attribute delay_by.
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# File 'lib/redshift/component.rb', line 118 def delay_by @delay_by end |
Instance Method Details
#make_generator(cl, state) ⇒ Object
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# File 'lib/redshift/target/c/flow/delay.rb', line 2 def make_generator cl, state delay_by = @delay_by @fname = "flow_#{CGenerator.make_c_name cl.name}_#{var}_#{state}" @inspect_str = "#{cl.name}:#{state}: " + "#{var} = #{formula} [delay: #{delay_by}]" @generator = proc do sl = cl.shadow_library ssn = cl.shadow_struct_name cont_state_ssn = cl.cont_state_class.shadow_struct_name require "redshift/target/c/flow/buffer" RedShift.library.define_buffer bufname = "#{var}_buffer_data" delayname = "#{var}_delay" tsname = "#{var}_time_step" cl.class_eval do shadow_attr_accessor bufname => "RSBuffer #{bufname}" shadow_attr_accessor delayname => "double #{delayname}" # delay should be set only using the expr designated in :by => "expr" shadow_attr tsname => "double #{tsname}" after_commit do alias_method "__#{bufname}=", "#{bufname}=" define_method "#{bufname}=" do |val| send("__#{bufname}=", val) d = world.time_step * (val.size / 4) send("#{delayname}=", d) # keep cached delay consistent end end private :"#{delayname}=" end sl.init_library_function.body \ "s_init_flow(#{fname}, #{fname.inspect}, #{inspect_str.inspect}, NONALGEBRAIC);" include_file, source_file = sl.add_file fname # We need the struct source_file.include(cl.shadow_library_include_file) flow = self var_name = @var source_file.define(fname).instance_eval do arguments "ComponentShadow *comp_shdw" scope :extern declare :shadow => %{ struct #{ssn} *shadow; struct #{cont_state_ssn} *cont_state; ContVar *var; double *ptr; long len, offset, steps; double delay, fill; } setup :shadow => %{ shadow = (#{ssn} *)comp_shdw; cont_state = (struct #{cont_state_ssn} *)shadow->cont_state; var = &cont_state->#{var_name}; } setup :rk_level => %{ shadow->world->rk_level--; } # has to happen before referenced alg flows are called in other setups setup :delay => begin "delay = #{Float(delay_by)}" rescue ArgumentError flow.translate(self, "delay", cl, 0, delay_by) end source_file.include World.shadow_library_include_file # Note: cases 1,2 must proceed to allow alg deps to be computed, # since their values are used later. body %{ switch (shadow->world->rk_level) { case 0: ptr = shadow->#{bufname}.ptr; offset = shadow->#{bufname}.offset; if (shadow->world->time_step != shadow->#{tsname}) { if (shadow->#{tsname} == 0.0) shadow->#{tsname} = shadow->world->time_step; else rs_raise(#{declare_class RedShiftError}, shadow->self, "Delay flow doesn't support changing time_step yet"); // ## } if (ptr && delay == shadow->#{delayname}) { len = shadow->#{bufname}.len; if (offset < 0 || offset > len - 4) { rs_raise(#{declare_class RedShiftError}, shadow->self, "Offset out of bounds: %d not in 0..%d!", offset, len - 4); } } else { steps = floor(delay / shadow->world->time_step + 0.5); if (steps <= 0) { rs_raise(#{declare_class RedShiftError}, shadow->self, "Delay too small: %f.", delay); } len = steps*4; if (!ptr) { #{flow.translate(self, "fill", cl, 0).join(" ")}; rs_buffer_init(&shadow->#{bufname}, len, fill); } else { // # delay != shadow->#{delayname} rs_buffer_resize(&shadow->#{bufname}, len); } shadow->#{delayname} = delay; ptr = shadow->#{bufname}.ptr; offset = shadow->#{bufname}.offset; } var->value[0] = ptr[offset]; var->value[1] = ptr[offset + 1]; var->value[2] = ptr[offset + 2]; var->value[3] = ptr[offset + 3]; #{flow.translate(self, "ptr[offset]", cl, 0).join(" ")}; break; case 1: case 2: break; case 3: ptr = shadow->#{bufname}.ptr; len = shadow->#{bufname}.len; offset = shadow->#{bufname}.offset; #{flow.translate(self, "ptr[offset+1]", cl, 1).join(" ")}; #{flow.translate(self, "ptr[offset+2]", cl, 2).join(" ")}; #{flow.translate(self, "ptr[offset+3]", cl, 3).join(" ")}; offset = (offset + 4) % len; var->value[0] = ptr[offset]; shadow->#{bufname}.offset = offset; break; default: rb_raise(#{declare_class RuntimeError}, "Bad rk_level, %ld!", shadow->world->rk_level); } shadow->world->rk_level++; var->rk_level = shadow->world->rk_level; } end end end |