Reversible debugging in a runtime environment

A computer system comprising:

• one or more processors;
• and
• one or more computer-readable media having stored thereon instructions that are executable by the one or more processors to configure the computer system to perform reverse execution debugging of an application, including instructions that are executable to configure the computer system to perform at least the following:
• identify a snapshot of application state for the application;
• emulate execution of the application on an debugger virtual machine that emulates functionality of a runtime virtual machine, wherein the debugger virtual machines uses intermediate level code to emulate execution of the application on the runtime virtual machine such that at least a portion of the intermediate level code is not converted to native machine instructions and executed on the runtime virtual machine, in a forward direction from the snapshot to an end point, causing generation of emulated historical execution state at various points along the emulation of the application;
• collect the emulated historical execution state;
• and
• use the collected emulated historical execution state, emulating reverse execution of the application by substituting the collected emulated historical execution state, when needed, to restore previous state needed as a result of emulation of reverse execution of the application.

A computer physical readable media having stored thereon instructions that are executable by one or more processors to configure a computer system to perform reverse execution debugging of an application, including instructions that are executable to configure the computer system to perform at least the following:

• identify a snapshot of application state for an application in an application framework;
• emulate execution of the application on a debugger virtual machine that emulates functionality of a runtime virtual machine, using bytecode, to emulate execution of the application on the runtime virtual machine such that at least a portion of the intermediate level code is not converted to native machine instructions and executed on the runtime virtual machine in a forward direction from the snapshot to an end point, causing generation of emulated historical execution state at various points along the emulation of the application;
• collect the emulated historical execution state;
• and
• use the collected emulated historical execution state, emulating reverse execution of the application by substituting the collected emulated historical execution state, when needed, to restore previous state needed as a result of emulation of reverse execution of the application.