Method for dynamically inserting code into a process by enabling taken branch traps to intercept a branch during the execution of the process

摘要

A method for dynamically inserting code or patching code during the running of a process on a computer is disclosed. The method comprises enabling taken branch traps on the process, intercepting a branch and redirecting processing of the branch instruction to a routine. The intercepting and redirecting may be done by a trap handler, which may respond to a plurality of branches or to any branches. The method may include rewriting a target of the branch instruction to a function call interceptor. The method may include processing the branch instruction after processing the routine. The routine may comprise a stub which might redirect processing to a wrapper function. The method may include avoiding any taken branches when the routine is active so that the method does not become recursive. The branch instruction may be provided with a completer that indicates whether more traps should be generated. The method may act as a profiler or a tracer. Also disclosed is a method of detecting stack or buffer overflows.