Class: HDLRuby::Low::Value
- Inherits:
-
Expression
- Object
- Base::Expression
- Expression
- HDLRuby::Low::Value
- Defined in:
- lib/HDLRuby/hruby_db.rb,
lib/HDLRuby/hruby_low.rb,
lib/HDLRuby/hruby_low2c.rb,
lib/HDLRuby/hruby_low2hdr.rb,
lib/HDLRuby/hruby_low2vhd.rb,
lib/HDLRuby/hruby_verilog.rb,
lib/HDLRuby/hruby_low2high.rb,
lib/HDLRuby/hruby_low_mutable.rb,
lib/HDLRuby/hruby_low_skeleton.rb,
lib/HDLRuby/hruby_low_fix_types.rb,
lib/HDLRuby/hruby_low_bool2select.rb,
lib/HDLRuby/hruby_low_casts_without_expression.rb
Overview
Extends the Value class with functionality for extracting expressions from cast.
Direct Known Subclasses
Constant Summary collapse
- @@made_values =
Set.new
Constants included from Low2Symbol
Low2Symbol::Low2SymbolPrefix, Low2Symbol::Low2SymbolTable, Low2Symbol::Symbol2LowTable
Instance Attribute Summary collapse
-
#content ⇒ Object
readonly
The content of the value.
Attributes inherited from Expression
Attributes included from Hparent
Instance Method Summary collapse
-
#<=>(value) ⇒ Object
Compare values.
-
#boolean_in_assign2select ⇒ Object
Converts booleans in assignments to select operators.
-
#casts_without_expression! ⇒ Object
Extracts the expressions from the casts.
-
#clone ⇒ Object
Clones the value (deeply).
-
#each_deep(&ruby_block) ⇒ Object
Iterates over each object deeply.
-
#eql?(obj) ⇒ Boolean
Comparison for hash: structural comparison.
-
#even? ⇒ Boolean
Tells if the value is even.
-
#explicit_types(type = nil) ⇒ Object
Explicit the types conversions in the value where +type+ is the expected type of the condition if any.
-
#hash ⇒ Object
Hash function.
-
#immutable? ⇒ Boolean
Tells if the expression is immutable (cannot be written.).
-
#initialize(type, content) ⇒ Value
constructor
Creates a new value typed +type+ and containing +content+.
-
#odd? ⇒ Boolean
Tells if the value is odd.
-
#set_content!(content) ⇒ Object
Sets the content.
-
#to_arith ⇒ Object
Generate the text of the equivalent VHDL is case of arithmetic expression.
-
#to_c(res, level = 0) ⇒ Object
Generates the C text for an access to the value.
-
#to_c_expr(res, level = 0) ⇒ Object
Generates the C text for an expression access to the value.
-
#to_c_make(res, level = 0) ⇒ Object
Generates the text of the equivalent c.
-
#to_ch(res) ⇒ Object
Generates the content of the h file.
-
#to_getrange ⇒ Object
How to use when simply obtaining the width.
-
#to_hdr(level = 0) ⇒ Object
Generates the text of the equivalent hdr text.
-
#to_high ⇒ Object
Creates a new high value expression.
-
#to_i ⇒ Object
Converts to integer.
-
#to_verilog(unknown = nil) ⇒ Object
Converts the system to Verilog code.
-
#to_vhdl(level = 0, std_logic = false, width = nil) ⇒ Object
Generates the text of the equivalent VHDL with +width+ bits.
-
#width ⇒ Object
Gets the bit width of the value.
Methods inherited from Expression
#boolean?, #break_types!, #each_node, #each_node_deep, #each_ref_deep, #extract_selects_to!, #leftvalue?, #map_nodes!, #replace_expressions!, #replace_names!, #rightvalue?, #set_type!, #statement, #use_name?
Methods included from Low2Symbol
Methods included from Hparent
Constructor Details
#initialize(type, content) ⇒ Value
Creates a new value typed +type+ and containing +content+.
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# File 'lib/HDLRuby/hruby_db.rb', line 329 def initialize(type,content) # Ensures type is from Low::Type type = Type.get(type) # # Ensures the content is valid for low-level hardware. # unless content.is_a?(Numeric) or # content.is_a?(HDLRuby::BitString) then # raise "Invalid type for a value content: #{content.class}." # end # NOW CHECKED BY BASE # Initialize the value structure. super(type,content) end |
Instance Attribute Details
#content ⇒ Object (readonly)
The content of the value.
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# File 'lib/HDLRuby/hruby_low.rb', line 4446 def content @content end |
Instance Method Details
#<=>(value) ⇒ Object
Compare values.
NOTE: mainly used for being supported by ranges.
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# File 'lib/HDLRuby/hruby_low.rb', line 4510 def <=>(value) value = value.content if value.respond_to?(:content) return self.content <=> value end |
#boolean_in_assign2select ⇒ Object
Converts booleans in assignments to select operators.
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# File 'lib/HDLRuby/hruby_low_bool2select.rb', line 175 def boolean_in_assign2select # Simple clones. return self.clone end |
#casts_without_expression! ⇒ Object
Extracts the expressions from the casts.
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# File 'lib/HDLRuby/hruby_low_casts_without_expression.rb', line 172 def casts_without_expression! # # Simple clones. # return self.clone return self end |
#clone ⇒ Object
Clones the value (deeply)
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# File 'lib/HDLRuby/hruby_low.rb', line 4536 def clone return Value.new(@type,@content) end |
#each_deep(&ruby_block) ⇒ Object
Iterates over each object deeply.
Returns an enumerator if no ruby block is given.
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# File 'lib/HDLRuby/hruby_low.rb', line 4478 def each_deep(&ruby_block) # No ruby block? Return an enumerator. return to_enum(:each_deep) unless ruby_block # A ruby block? First apply it to current. ruby_block.call(self) # Then apply on the type. self.type.each_deep(&ruby_block) # Then apply on the content if possible. if self.content.respond_to?(:each_deep) then self.content.each_deep(&ruby_block) end end |
#eql?(obj) ⇒ Boolean
Comparison for hash: structural comparison.
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# File 'lib/HDLRuby/hruby_low.rb', line 4492 def eql?(obj) # General comparison. return false unless super(obj) # Specific comparison. return false unless obj.is_a?(Value) return false unless @content.eql?(obj.content) return true end |
#even? ⇒ Boolean
Tells if the value is even.
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# File 'lib/HDLRuby/hruby_low.rb', line 4521 def even? return @content.even? end |
#explicit_types(type = nil) ⇒ Object
Explicit the types conversions in the value where +type+ is the expected type of the condition if any.
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# File 'lib/HDLRuby/hruby_low_fix_types.rb', line 205 def explicit_types(type = nil) # Does the type match the value? if type && !self.type.eql?(type) then # No, update the type of the value. return Value.new(type,self.content) else # yes, return the value as is. return self.clone end end |
#hash ⇒ Object
Hash function.
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# File 'lib/HDLRuby/hruby_low.rb', line 4502 def hash return [super,@content].hash end |
#immutable? ⇒ Boolean
Tells if the expression is immutable (cannot be written.)
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# File 'lib/HDLRuby/hruby_low.rb', line 4470 def immutable? # Values are always immutable. true end |
#odd? ⇒ Boolean
Tells if the value is odd.
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# File 'lib/HDLRuby/hruby_low.rb', line 4526 def odd? return @content.odd? end |
#set_content!(content) ⇒ Object
Sets the content.
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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 1379 def set_content!(content) unless content.is_a?(Numeric) or content.is_a?(HDLRuby::BitString) content = HDLRuby::BitString.new(content.to_s) end @content = content end |
#to_arith ⇒ Object
Generate the text of the equivalent VHDL is case of arithmetic expression.
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# File 'lib/HDLRuby/hruby_low2vhd.rb', line 1143 def to_arith case self.content when HDLRuby::BitString if self.content.specified? then sign = self.type.signed? && self.content.to_s[-1] == "0" ? -1 : 1 return (sign * self.content.to_s.to_i(2)).to_s else return self.content.to_s.upcase end else # NOTE: in VHDL, "z" and "x" must be upcase. return self.content.to_s.upcase end end |
#to_c(res, level = 0) ⇒ Object
Generates the C text for an access to the value. +level+ is the hierachical level of the object.
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# File 'lib/HDLRuby/hruby_low2c.rb', line 1904 def to_c(res,level = 0) # res << Low2C.make_name(self) << "()" # return res res << (" " * (level*3)) # res << "d=" << Low2C.make_name(self) << "();\n" res << "push(" << Low2C.make_name(self) << "());\n" return res end |
#to_c_expr(res, level = 0) ⇒ Object
Generates the C text for an expression access to the value. +level+ is the hierachical level of the object.
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# File 'lib/HDLRuby/hruby_low2c.rb', line 1915 def to_c_expr(res,level = 0) res << Low2C.make_name(self) << "()" return res end |
#to_c_make(res, level = 0) ⇒ Object
Generates the text of the equivalent c. +level+ is the hierachical level of the object. def to_c_make(level = 0)
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# File 'lib/HDLRuby/hruby_low2c.rb', line 1934 def to_c_make(res,level = 0) # Check is the value maker is already present. maker = Low2C.make_name(self); # return "" if @@made_values.include?(maker) return res if @@made_values.include?(maker) @@made_values.add(maker) # The resulting string. # res = "" # The header of the value generation. res << " " * level*3 # res << "Value " << Low2C.make_name(self) << "() {\n" res << "Value " << maker << "() {\n" # Declares the data. # Create the bit string. # str = self.content.is_a?(BitString) ? # self.content.to_s : self.content.to_s(2).rjust(32,"0") if self.content.is_a?(BitString) then str = self.content.is_a?(BitString) ? self.content.to_s : self.content.to_s(2).rjust(32,"0") else # sign = self.content>=0 ? "0" : "1" # str = self.content.abs.to_s(2).rjust(width,sign).upcase if self.content >= 0 then str = self.content.to_s(2).rjust(width,"0").upcase else # Compute the extension to the next multiple # of int_width ext_width = (((width-1) / Low2C.int_width)+1)*Low2C.int_width # Convert the string. str = (2**ext_width+self.content).to_s(2).upcase end # puts "content=#{self.content} str=#{str}" end # Is it a fully defined number? # NOTE: bignum values are not supported by the simulation engine # yet, therefore numeric values are limited to 64 max. if str =~ /^[01]+$/ && str.length <= 64 then # Yes, generate a numeral value. res << " " * (level+1)*3 # res << "static unsigned long long data[] = { " res << "static unsigned int data[] = { " res << str.scan(/.{1,#{Low2C.int_width}}/m).reverse.map do |sub| sub.to_i(2).to_s # + "ULL" end.join(",") res << " };\n" # Create the value. res << " " * (level+1)*3 # puts "str=#{str} type width=#{self.type.width} signed? #{type.signed?}" # res << "return make_set_value(#{self.type.to_c(level+1)},1," + # "data);\n" res << "return make_set_value(" self.type.to_c(res,level+1) res << ",1,data);\n" else # No, generate a bit string value. res << " " * (level+1)*3 # res << "static unsigned char data[] = \"#{str}\";\n" res << "static unsigned char data[] = \"#{str.reverse}\";\n" # Create the value. res << " " * (level+1)*3 # res << "return make_set_value(#{self.type.to_c(level+1)},0," + # "data);\n" res << "return make_set_value(" self.type.to_c(res,level+1) res << ",0,data);\n" end # Close the value. res << " " * level*3 res << "}\n\n" # Return the result. return res end |
#to_ch(res) ⇒ Object
Generates the content of the h file. def to_ch
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# File 'lib/HDLRuby/hruby_low2c.rb', line 1922 def to_ch(res) # res = "" # return "extern Value #{Low2C.make_name(self)}();" res << "extern Value " << Low2C.make_name(self) << "();" return res end |
#to_getrange ⇒ Object
How to use when simply obtaining the width
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# File 'lib/HDLRuby/hruby_verilog.rb', line 1534 def to_getrange return "#{self.content.to_verilog}" end |
#to_hdr(level = 0) ⇒ Object
Generates the text of the equivalent hdr text. +level+ is the hierachical level of the object.
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# File 'lib/HDLRuby/hruby_low2hdr.rb', line 553 def to_hdr(level = 0) if self.content.is_a?(HDLRuby::BitString) then return "_#{self.content}" else return self.content.to_s end end |
#to_high ⇒ Object
Creates a new high value expression.
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# File 'lib/HDLRuby/hruby_low2high.rb', line 384 def to_high # Is there a content? if (self.content) then # Yes, use it for creating the new value. return HDLRuby::High::Value.new(self.type.to_high, self.content.to_high) else # puts "Self.type.name=#{self.type.name}" # No (this should be a void value). return HDLRuby::High::Value.new(self.type.to_high,nil) end end |
#to_i ⇒ Object
Converts to integer.
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# File 'lib/HDLRuby/hruby_low.rb', line 4531 def to_i return @content.to_i end |
#to_verilog(unknown = nil) ⇒ Object
Converts the system to Verilog code. If it is bit, it is b, and if it is int, it is represented by d. (Example: 4'b0000, 32'd1)
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# File 'lib/HDLRuby/hruby_verilog.rb', line 1519 def to_verilog(unknown = nil) if self.type.base.name.to_s == "bit" return "#{self.type.range.first + 1}'b#{self.content.to_verilog}" elsif self.type.name.to_s == "integer" str = self.content.to_verilog if str[0] == "-" then # Negative value. return "-#{self.type.range.first + 1}'d#{str[1..-1]}" else return "#{self.type.range.first + 1}'d#{str}" end end return "#{self.type.range.first + 1}'b#{self.content.to_verilog}" end |
#to_vhdl(level = 0, std_logic = false, width = nil) ⇒ Object
Generates the text of the equivalent VHDL with +width+ bits. +level+ is the hierachical level of the object.
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# File 'lib/HDLRuby/hruby_low2vhd.rb', line 1162 def to_vhdl(level = 0, std_logic = false, width = nil) raise "Invalid std_logic argument: #{std_logic}." unless std_logic == true || std_logic == false if self.type.boolean? then # Boolean case if self.content.is_a?(HDLRuby::BitString) return self.zero? ? "false" : "true" else return self.to_i == 0 ? "false" : "true" end end # Other cases # Maybe the value is used as a range or an index. if self.parent.is_a?(RefIndex) or self.parent.is_a?(RefRange) then # Yes, convert to a simple integer. return self.to_i.to_s.upcase end # No, generates as a bit string. width = self.type.width unless width # puts "self.type=#{self.type} width=#{width}" case self.content # when Numeric # return self.content.to_s when HDLRuby::BitString # Compute the extension: in case of signed type, the extension # is the last bit. Otherwise it is 0 unless the last bit # is not defined (Z or X). sign = self.type.signed? ? self.content.to_s[-1] : /[01]/ =~ self.content[-1] ? "0" : self.content[-1] return '"' + self.content.to_s.rjust(width,sign).upcase + '"' else # sign = self.type.signed? ? (self.content>=0 ? "0" : "1") : "0" sign = self.content>=0 ? "0" : "1" return '"' + self.content.abs.to_s(2).rjust(width,sign).upcase + '"' end end |
#width ⇒ Object
Gets the bit width of the value.
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# File 'lib/HDLRuby/hruby_low.rb', line 4516 def width return @type.width end |