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| 1 | +#!/usr/bin/env ruby |
| 2 | + |
| 3 | +require 'digest' |
| 4 | +require 'json' |
| 5 | +require_relative 'LEFNamedObject' |
| 6 | + |
| 7 | +# |
| 8 | +# Class to store LEF via information |
| 9 | +# |
| 10 | +class LEFVia < LEFNamedObject |
| 11 | + # |
| 12 | + # Container class that store information about the and shapes that are part |
| 13 | + # of the via that exist on the specified layer. Only RECTs are supported. |
| 14 | + # |
| 15 | + class LEFViaLayer |
| 16 | + # |
| 17 | + # Initializer |
| 18 | + # |
| 19 | + # layer is a ref to a LEFLayer |
| 20 | + # shape_list is the list of shapes for the via on the specified layer |
| 21 | + # |
| 22 | + def initialize(layer) |
| 23 | + # make sure this is a LEFLayer |
| 24 | + if !layer.is_a?(LEFLayer) |
| 25 | + raise ArgumentError, sprintf("LEFViaLayer initialize expects LEFLayer, got %s", layer.class.name) |
| 26 | + end |
| 27 | + @layer = layer |
| 28 | + @shape_list = [] |
| 29 | + end |
| 30 | + |
| 31 | + # |
| 32 | + # Adds a shape to the shape list |
| 33 | + # |
| 34 | + def add_shape(shape) |
| 35 | + @shape_list << shape |
| 36 | + end |
| 37 | + |
| 38 | + # |
| 39 | + # Returns the LEF layer for the shapes |
| 40 | + # |
| 41 | + def get_layer() |
| 42 | + return @layer |
| 43 | + end |
| 44 | + |
| 45 | + # |
| 46 | + # Returns the shape list |
| 47 | + # |
| 48 | + def get_shape_list() |
| 49 | + return @shape_list |
| 50 | + end |
| 51 | + |
| 52 | + # |
| 53 | + # Computes and returns the sha256 for the container |
| 54 | + # |
| 55 | + def sha256() |
| 56 | + layer_sha = get_layer().sha256() |
| 57 | + serialized_shapes = JSON.generate(get_shape_list) |
| 58 | + shape_list_sha = Digest::SHA256.hexdigest(serialized_shapes) |
| 59 | + return Digest::SHA256.hexdigest(layer_sha + shape_list_sha) |
| 60 | + end |
| 61 | + |
| 62 | + # |
| 63 | + # Writes the LEF snippet for the container |
| 64 | + # |
| 65 | + def write_lef(outfh) |
| 66 | + outfh.puts sprintf(" LAYER %s ;", get_layer().get_name()) |
| 67 | + get_shape_list.each do | rect | |
| 68 | + outfh.puts sprintf(" RECT %5.3f %5.3f %5.3f %5.3f ;", rect[0], |
| 69 | + rect[1], rect[2], rect[3]) |
| 70 | + end |
| 71 | + end |
| 72 | + end |
| 73 | + |
| 74 | + # |
| 75 | + # Initializer |
| 76 | + # |
| 77 | + # layer_list is a list of LEFViaLayers, which is unsorted. That way whoever |
| 78 | + # is creating the via can just add LEFViaLayers without regard for the |
| 79 | + # layer stacking order. |
| 80 | + # |
| 81 | + def initialize(name, is_default=false) |
| 82 | + super(name) |
| 83 | + @is_default = is_default |
| 84 | + |
| 85 | + # List of LEFViaLayers - unsorted |
| 86 | + @layer_list = [] |
| 87 | + end |
| 88 | + |
| 89 | + # |
| 90 | + # Computes and returns the sha256 for the via |
| 91 | + # |
| 92 | + def sha256() |
| 93 | + layer_stack = get_layer_list() |
| 94 | + hashes = get_layer_list.map { |layer| layer.sha256 } |
| 95 | + concat_hashes = hashes.join |
| 96 | + return Digest::SHA256.hexdigest(concat_hashes) |
| 97 | + end |
| 98 | + |
| 99 | + # |
| 100 | + # Returns the LEFViaLayer list for the via |
| 101 | + # |
| 102 | + # default is to sort the layers, by the layer number. That way it's returned |
| 103 | + # bottom layer to top layer |
| 104 | + # |
| 105 | + def get_layer_list(sorted=true) |
| 106 | + if sorted |
| 107 | + return @layer_list.sort_by { |layer| layer.get_layer().get_number } |
| 108 | + end |
| 109 | + return @layer_list |
| 110 | + end |
| 111 | + |
| 112 | + # |
| 113 | + # Adds a layer to the layer list |
| 114 | + # |
| 115 | + def add_layer(layer) |
| 116 | + @layer_list << layer |
| 117 | + end |
| 118 | + |
| 119 | + # |
| 120 | + # Writes the LEF snippet |
| 121 | + # |
| 122 | + def write_lef(outfh) |
| 123 | + via_name = get_name() |
| 124 | + if @is_default |
| 125 | + default_str = " DEFAULT" |
| 126 | + else |
| 127 | + default_str = "" |
| 128 | + end |
| 129 | + outfh.puts sprintf("VIA %s%s", via_name, default_str) |
| 130 | + get_layer_list().each do | layer | |
| 131 | + layer.write_lef(outfh) |
| 132 | + end |
| 133 | + outfh.puts sprintf("END %s", via_name) |
| 134 | + outfh.puts |
| 135 | + end |
| 136 | +end |
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