HLASM Language Reference
HLASM Language Reference HLASM Language Reference
DC Instruction duplication_factor causes the nominal_value to be generated the number of times indicated by this factor. See “Subfield 1: Duplication Factor” on page 132. type further determines the type of constant the nominal_value represents. See “Subfield 2: Type” on page 133. type_extension determines some of the characteristics of the constant. See “Subfield 3: Type Extension” on page 134. | program_type | assign a programmer determined 32-bit value to the symbol naming the DC | instruction, if a symbol was present. See “Subfield 4: Program type” on | page 135. modifier describes the length, the scaling, and the exponent of the nominal_value. See “Subfield 5: Modifier” on page 136. nominal_value defines the value of the constant. See “Subfield 6: Nominal Value” on page 140. For example, in: 1EBP(7)L2'12' the six subfields are: Duplication factor is 1 Type is E Type extension is B | Program type is P(7) Modifier is L2 Nominal value is 12 If all subfields are specified, the order given above is required. The first, third, fourth and fifth subfields can be omitted, but the second and sixth must be specified in that order. Rules for DC Operand 1. The type subfield and the nominal value must always be specified unless the duplication factor is zero. If the duplication factor is zero, only the type must be specified. | 2. The duplication factor, type extension, program type, and modifier subfields are optional. 3. When multiple operands are specified, they can be of different types. 4. When multiple nominal values are specified in the sixth subfield, they must be separated by commas and be of the same type. Multiple nominal values are not allowed for character or graphic constants. | 5. The descriptive subfields, apart from the program type, apply to all the nominal | values. The program type applies to only the symbol naming the DC | instruction, if a symbol was present. Separate constants are generated for each separate operand and nominal value specified. 128 HLASM V1R5 Language Reference
DC Instruction 6. No spaces are allowed: Between subfields Between multiple operands General Information About Constants Constants defined by the DC instruction are assembled into an object module at the location at which the instruction is specified. However, the type of constant being defined, and the presence or absence of a length modifier, determines whether the constant is to be aligned on a particular storage boundary or not (see “Alignment of Constants”). Symbolic Addresses of Constants: The value of the symbol that names the DC instruction is the address of the first byte (after alignment) of the first or only constant. Length Attribute Value of Symbols Naming Constants The length attribute value assigned to the symbols in the name field of the constants is equal to: The implicit length (see “Implicit Length” in Figure 33) of the constant when no explicit length is specified in the operand of the constant, or The explicit length (see “Value of Length Attribute” in Figure 33) of the constant. If more than one operand is present, the length attribute value of the symbol is the length in bytes of the first constant specified, according to its implicit or explicit length. Alignment of Constants The assembler aligns constants on different boundaries according to the following: On boundaries implicit to the type of constant (see “Implicit Boundary Alignment” in Figure 34 on page 130) when no length is specified. On byte boundaries (see “Boundary Alignment” in Figure 34) when an explicit length is specified. Bytes that are skipped to align a constant at the correct boundary are not considered part of the constant. They are filled with binary zeros. Notes: 1. The automatic alignment of constants and areas does not occur if the NOALIGN assembler option has been specified. 2. Alignment can be forced to any boundary by a preceding DS or DC instruction with a zero duplication factor. This occurs whether or not the ALIGN option is set. Figure 33 (Page 1 of 2). Length Attribute Value of Symbol Naming Constants Type of constant Implicit Length Examples B as needed DC B'11' 1 Value of Length Attribute Chapter 5. Assembler Instruction Statements 129
- Page 98 and 99: General Instructions Chapter 4. Mac
- Page 100 and 101: Input/Output Operations For further
- Page 102 and 103: Branching with Extended Mnemonic Co
- Page 104 and 105: Symbolic Operation Codes variations
- Page 106 and 107: Operand Entries Registers You can s
- Page 108 and 109: Operand Entries “Program Structur
- Page 110 and 111: Operand Entries Format │ Coded or
- Page 112 and 113: Examples of Coded Machine Instructi
- Page 114 and 115: Examples of Coded Machine Instructi
- Page 116 and 117: Examples of Coded Machine Instructi
- Page 118 and 119: Examples of Coded Machine Instructi
- Page 120 and 121: Chapter 5. Assembler Instruction St
- Page 122 and 123: *PROCESS Statement *PROCESS Stateme
- Page 124 and 125: ACONTROL Instruction ►►──
- Page 126 and 127: ACONTROL Instruction FLAG(PAGE0) in
- Page 128 and 129: AINSERT Instruction character_strin
- Page 130 and 131: AMODE Instruction alias_string is t
- Page 132 and 133: CATTR Instruction Figure 25. AMODE/
- Page 134 and 135: CATTR Instruction | statements for
- Page 136 and 137: CCW1 Instruction data_count is an a
- Page 138 and 139: CEJECT Instruction If symbol is an
- Page 140 and 141: CNOP Instruction Figure 29 (Page 2
- Page 142 and 143: COPY Instruction In the following e
- Page 144 and 145: CSECT Instruction symbol in the nam
- Page 146 and 147: DC Instruction ROUTINE B GAMMA DXD
- Page 150 and 151: DC Instruction Figure 33 (Page 2 of
- Page 152 and 153: DC Instruction With EBCDIC spaces
- Page 154 and 155: DC Instruction Further information
- Page 156 and 157: DC Instruction | Symbols used in su
- Page 158 and 159: DC Instruction The length attribute
- Page 160 and 161: DC Instruction Notes: 1. Don't conf
- Page 162 and 163: DC Instruction—Character Constant
- Page 164 and 165: DC Instruction—Character Constant
- Page 166 and 167: DC Instruction—Graphic Constant r
- Page 168 and 169: DC Instruction—Fixed-Point Consta
- Page 170 and 171: DC Instruction—Fixed-Point Consta
- Page 172 and 173: DC Instruction—Decimal Constants
- Page 174 and 175: DC Instruction—Address Constants
- Page 176 and 177: DC Instruction—Address Constants
- Page 178 and 179: DC Instruction—Offset Constant re
- Page 180 and 181: DC Instruction—Length Constant Le
- Page 182 and 183: DC Instruction—Hexadecimal Floati
- Page 184 and 185: DC Instruction—Hexadecimal Floati
- Page 186 and 187: DC Instruction—Hexadecimal Floati
- Page 188 and 189: DC Instruction—Binary Floating-Po
- Page 190 and 191: DC Instruction—Binary Floating-Po
- Page 192 and 193: DROP Instruction DROP Instruction T
- Page 194 and 195: DS Instruction USING DSECTA,14 ALBL
- Page 196 and 197: DS Instruction The size of a storag
DC Instruction<br />
6. No spaces are allowed:<br />
Between subfields<br />
Between multiple operands<br />
General Information About Constants<br />
Constants defined by the DC instruction are assembled into an object module at<br />
the location at which the instruction is specified. However, the type of constant<br />
being defined, and the presence or absence of a length modifier, determines<br />
whether the constant is to be aligned on a particular storage boundary or not (see<br />
“Alignment of Constants”).<br />
Symbolic Addresses of Constants: The value of the symbol that names the DC<br />
instruction is the address of the first byte (after alignment) of the first or only<br />
constant.<br />
Length Attribute Value of Symbols Naming Constants<br />
The length attribute value assigned to the symbols in the name field of the<br />
constants is equal to:<br />
The implicit length (see “Implicit Length” in Figure 33) of the constant when no<br />
explicit length is specified in the operand of the constant, or<br />
The explicit length (see “Value of Length Attribute” in Figure 33) of the<br />
constant.<br />
If more than one operand is present, the length attribute value of the symbol is the<br />
length in bytes of the first constant specified, according to its implicit or explicit<br />
length.<br />
Alignment of Constants<br />
The assembler aligns constants on different boundaries according to the following:<br />
On boundaries implicit to the type of constant (see “Implicit Boundary<br />
Alignment” in Figure 34 on page 130) when no length is specified.<br />
On byte boundaries (see “Boundary Alignment” in Figure 34) when an explicit<br />
length is specified.<br />
Bytes that are skipped to align a constant at the correct boundary are not<br />
considered part of the constant. They are filled with binary zeros.<br />
Notes:<br />
1. The automatic alignment of constants and areas does not occur if the<br />
NOALIGN assembler option has been specified.<br />
2. Alignment can be forced to any boundary by a preceding DS or DC instruction<br />
with a zero duplication factor. This occurs whether or not the ALIGN option is<br />
set.<br />
Figure 33 (Page 1 of 2). Length Attribute Value of Symbol Naming Constants<br />
Type of<br />
constant<br />
Implicit<br />
Length<br />
Examples<br />
B as needed DC B'11' 1<br />
Value of<br />
Length<br />
Attribute<br />
Chapter 5. Assembler Instruction Statements 129
Change language