==== 7.5.23 getstatic_<t> ====

Get static field from class 

Format 

getstatic_ 

indexbyte1 

indexbyte2 

Forms 

getstatic_a = 123 (0x7b) getstatic_b = 124 (0x7c) getstatic_s = 125 (0x7d) getstatic_i = 126 (0x7e) 

Stack 

... -> ..., value 

OR 

... -> ..., value.word1, value.word2 

Description 

The unsigned indexbyte1 and indexbyte2 are used to construct an index into the constant pool of the current package ([[3.5_Frames| Section 3.5, Frames]]), where the value of the index is (indexbyte1 << 8) | indexbyte2. The constant pool item at the index must be of type CONSTANT_StaticFieldref ([[6.7.3_CONSTANT_StaticFieldref and CONSTANT_StaticMethodref| Section 6.7.3, CONSTANT_StaticFieldref and CONSTANT_StaticMethodref]]), a reference to a static field. 

The item must resolve to a field with a type that matches t, as follows: 

 

  * a field must be of type reference    

  * b field must be of type byte or type boolean    

  * s field must be of type short    

  * i field must be of type int    

The width of a class field is determined by the field type specified in the instruction. The item is resolved, determining the field offset. The item is resolved, determining the class field. The value of the class field is fetched. If the value is of type byte or boolean, it is sign-extended to a short. The value is pushed onto the operand stack. 

Notes 

If a virtual machine does not support the int data type, the getstatic_i instruction will not be available.