A dynamic compiler program product, method, and device for sequentially compiling a partial computer program in a computer. The program product causes the computer to: acquire respective values of one or more pieces of current execution status information; read, from the shared pool, a list of the conditions associated with an executable instruction stream generated by compiling a partial program that is the same as a partial program to be compiled, and determine whether respective values of corresponding pieces of current execution status information satisfy the conditions. The program product causes the computer to further generate an executable instruction stream by compiling the partial program to be compiled on the condition that a result of determination made is negative.