Load Instructions

The load instructions load a value on the operand stack.

The following instructions load a value from a local variable on the operand stack:

• iload, fload, lload, dload, aload. Load respectively a value of type int, float, long, double and reference from a local variable at position index in the local variable table onto the operand stack. Operand: index. Stack: ... ..., value.

• iload_n>, fload_n>, lload_n>, dload_n>, aload_n>. Load respectively a value of type int, float, long, double and reference from a local variable at index <n> onto the operand stack where <n> = (0..3). These are specialized instructions, introduced because it is often needed to access local variables at postitions 0 through 3. No operands. Stack: ... ..., value.

The following instructions load a constant on the operand stack:

• bipush. Push a byte. Operand: byte. Stack: ... ..., byte.

• sipush. Push a short. Operands: byte1, byte2. Stack: ... ..., short.

• ldc. Push an item from the constant_pool[]. Operand: index. Stack: ... ..., item.

• ldc_w. Push an item with a wide index from the constant_pool[]. Operands: indexbyte1, indexbyte2. Stack: ... ..., item.

• ldc2_w. Push a long or a double with a wide index from the constant_pool[]. Operands: indexbyte1, indexbyte2. Stack: ... ..., item.

• iconst_i>, fconst_f>, lconst_l>, dconst_d>. Push respectively int <i>, float <f>, long <l> and double <d> on the operand stack, where <i> is (0..5), <f> is (0..2), <l> is (0..1) and <d> is (0..1). No operands. Stack: ... ..., value.

• iconst_m1. Push int -1. No Operands. Stack: ... ..., -1.

• aconst_null. Push null reference. No operands. Stack: ... ..., null.