Hybrid binaries supporting code stream folding

A method, implemented at a computer system that includes a processor, for generating a hybrid binary image, the hybrid binary image being executable under both a native application binary interface (ABI) and a compatibility ABI, the method comprising:

• based at least on identifying a first machine type of the native ABI, emitting the first machine type into a machine type field of the hybrid binary image, the machine type field being structured to be utilized when the hybrid binary image is loaded by a native process executing under the native ABI;
• based at least on identifying a first function that is foldable, emitting, into the hybrid binary image, a compiled version of the first function that is executable under both of the native ABI and the compatibility ABI, the compiled version of the first function being structured to call a first compiled version of a second function that is non-foldable when the hybrid binary image is loaded by the native process, the first compiled version of the second function being executable under the native ABI;
• and
• emitting, into the hybrid binary image, a fixup table that is structured to be utilized when the hybrid binary image is loaded by a compatibility process executing under the compatibility ABI, the fixup table defining a plurality of transformations to memory loaded from the hybrid binary image, the plurality of transformations including:
• a first transformation that adjusts the machine type field to comprise a second machine type of the compatibility ABI;
• and
• a second transformation that configures the compiled version of the first function to call a second compiled version of the second function instead of the first compiled version of the second function, the second compiled version of the second function being executable under the compatibility ABI.

A computer system for generating a hybrid binary image, the hybrid binary image being executable under both a native application binary interface (ABI) and a compatibility ABI, comprising:

• a processor;
• and
• a hardware storage device that stores computer-executable instructions that are executable by the processor to cause the computer system to at least:
• based at least on identifying a first function that is foldable, emit, into the hybrid binary image, a compiled version of the first function that is executable under both of the native ABI and the compatibility ABI, the compiled version of the first function being structured to call a first compiled version of a second function that is non-foldable when the hybrid binary image is loaded by a native process executing under the native ABI, the first compiled version of the second function being executable under the native ABI;
• and
• emit, into the hybrid binary image, a fixup table that is structured to be utilized when the hybrid binary image is loaded by a compatibility process executing under the compatibility ABI, the fixup table defining one or more transformations to memory loaded from the hybrid binary image, the one or more transformations including a first transformation that configures the compiled version of the first function to call a second compiled version of the second function instead of the first compiled version of the second function, the second compiled version of the second function being executable under the compatibility ABI.