Garbage collection barrier with direct user mode traps

Abstract

A computer system includes a processor; and a memory coupled to the processor, configured to provide the processor with a plurality of instructions including a set of garbage collection instructions configured to perform one or more garbage collection barrier operations and a subsequent instruction that immediately follows the garbage collection instruction; wherein the processor is configured to execute the set of garbage collection instructions, including by: evaluating a memory reference to determine a condition associated with the set of garbage collection instructions; and in the event that the condition is met, while maintaining the same privilege level, saving information that is based at least in part on the current value of a program counter, and setting the program counter to correspond to a target location that is other than the location of the subsequent instruction.

Dependencies are inferred from the claim text.