Dual architecture function pointers having consistent reference addresses

A computer system for using a common reference memory address when processing calls within a process that supports execution of both (i) native code targeting a native application binary interface (ABI) that corresponds to a native instruction set architecture (ISA) and that has a first calling convention, and (ii) foreign code targeting a foreign ABI that corresponds to a foreign ISA and that has a second calling convention, comprising:

• a processor implementing the native ISA;
• and
• a hardware storage device that stores computer-executable instructions that are executable by the processor to cause the computer system to perform at least the following:
• based at least on identifying a call that targets a reference memory address for a callee function, determine whether the callee function corresponds to the native ABI or to the foreign ABI, wherein:
• the callee function is determined to correspond to the native ABI based on one of (i) a lookup structure indicating that the reference memory address is contained within a first memory range storing native code, or (ii) a fast-forward sequence being identified at the reference memory address, and
• the callee function is determined to correspond to the foreign ABI based at least on the lookup structure indicating that the reference memory address is contained within a second memory range not storing native code;
• and
• based at least on the determining, initiate execution of the callee function based on performing one of:
• when a caller function corresponds to the foreign ABI, and when the callee function is determined to correspond to the foreign ABI, directly calling the callee function using the reference memory address within an emulator;
• when the caller function corresponds to the foreign ABI, and when the callee function is determined to correspond to the native ABI, calling an entry thunk that (i) adapts a second calling convention to the first calling convention and then (ii) directly calls the callee function using the reference memory address;
• when the caller function corresponds to the native ABI, and when the callee function is determined to correspond to the foreign ABI, calling an exit thunk that (i) adapts a first calling convention of the native ABI to a second calling convention of the foreign ABI and then (ii) invokes the emulator to directly call the callee function using the reference memory address;
• or
• when the caller function corresponds to the native ABI, and when the callee function is determined to correspond to the native ABI, directly calling the callee function using the reference memory address.

A computer program product for using a common reference memory address when processing calls within a process that supports execution of both (i) native code targeting a native application binary interface (ABI) that corresponds to a native instruction set architecture (ISA) and that has a first calling convention, and (ii) foreign code targeting a foreign ABI that corresponds to a foreign ISA and that has a second calling convention, the computer program product comprising a hardware storage device that stores computer-executable instructions that are executable by a processor implementing the native ISA to cause a computer system to perform at least the following:

• based at least on identifying a call that targets a reference memory address for a callee function, determine whether the callee function corresponds to the native ABI or to the foreign ABI, wherein:
• the callee function is determined to correspond to the native ABI based on one of (i) a lookup structure indicating that the reference memory address is contained within a first memory range storing native code, or (ii) a fast-forward sequence being identified at the reference memory address, and
• the callee function is determined to correspond to the foreign ABI based at least on the lookup structure indicating that the reference memory address is contained within a second memory range not storing native code;
• and
• based at least on the determining, initiate execution of the callee function based on performing one of:
• when a caller function corresponds to the foreign ABI, and when the callee function is determined to correspond to the foreign ABI, directly calling the callee function using the reference memory address within an emulator;
• when the caller function corresponds to the foreign ABI, and when the callee function is determined to correspond to the native ABI, calling an entry thunk that (i) adapts a second calling convention to the first calling convention and then (ii) directly calls the callee function using the reference memory address;
• when the caller function corresponds to the native ABI, and when the callee function is determined to correspond to the foreign ABI, calling an exit thunk that (i) adapts a first calling convention of the native ABI to a second calling convention of the foreign ABI and then (ii) invokes the emulator to directly call the callee function using the reference memory address;
• or
• when the caller function corresponds to the native ABI, and when the callee function is determined to correspond to the native ABI, directly calling the callee function using the reference memory address.