Post-execution instruction tracing of virtualized instructions

1. A method of tracing an emulated execution order of non-native instructions based on natively executing code on a computing system having a native instruction set architecture, the method comprising:

during emulated execution of non-native program code, maintaining a jump history in the computing system, the jump history including a listing of non-native jump instructions for which execution is emulated in the computing system, wherein the one or more non-native instructions are included in a virtual instruction block, and wherein the non-native jump instruction is included in the virtual instruction block as a last instruction in the virtual instruction block; and

for each of the non-native jump instructions included in the jump history:

accessing non-native program code including the non-native instructions to determine one or more non-native instructions executed between the non-native jump instruction and a last-executed non-native jump instruction; and

aggregating the non-native jump instruction and the one or more non-native instructions into an instruction trace.

2. The method of claim 1 , wherein the jump history comprises jump instructions captured in an emulated jump table.

3. The method of claim 1 , wherein the instruction trace approximates a sequence of non-native instructions in execution order.

4. The method of claim 1 , wherein the nonnative program code is segmented into a plurality of virtual instruction blocks.

5. The method of claim 4 , wherein each of the plurality of virtual instruction blocks is segmented based at least in part on locations of non-native jump instructions and jump targets included in the non-native program code.

6. The method of claim 4 , wherein the jump history is stored in a jump table managed by virtualization software.

7. The method of claim 1 , wherein the virtualization software comprises a non-native instruction translator.

8. The method of claim 1 , wherein the instruction trace represents an order of intended execution of the non-native program code.

9. The method of claim 1 , wherein the one or more non-native instructions are incapable of native execution on the computing system.

10. The method of claim 1 , further comprising, during emulated execution of the non-native program code, capturing native statistics regarding execution of the native instructions that correspond to the non-native program code.

11. The method of claim 10 , further comprising, after emulated execution of the non-native program code, correlating the native statistics to the instruction trace of the one or more non-native instructions.

12. An apparatus, comprising:

a memory;

a first mass storage device; and

a processor coupled to the memory, and coupled to the mass storage device, in which the processor is configured:

to trace an execution order of non-native instructions based on natively executing code on a computing system having a native instruction set architecture;

to maintain a jump history including a plurality of non-native jump instructions in emulated execution order, wherein the one or more non-native instructions are included in a virtual instruction block, and wherein the non-native jump instruction is included in a virtual instruction block as a last instruction in the virtual instruction block; and

to execute virtualization software, executing natively on the computing system, the virtualization software configured to, for each of the plurality of non-native jump instructions, access non-native program code including the non-native instructions to determine one or more non-native instructions executed between the non-native jump instruction and a last-executed non-native jump instruction, and aggregate the non-native jump instruction and the one or more non-native instructions into an instruction trace.

13. The apparatus of claim 12 , wherein the jump history is stored in a jump table managed by virtualization software.

14. The apparatus of claim 12 , wherein the virtualization software comprises a translation software system.

15. The apparatus of claim 12 , wherein the virtualization software comprises an emulator.

16. The apparatus of claim 12 , wherein the non-native instructions are included in non-native program code, the non-native program code separated into a plurality of non-native instruction blocks.

17. The apparatus of claim 16 , wherein the virtualization software is configured to combine hardware-generated execution statistics with the instruction trace to determine performance in executing each of the one or more non-native instruction blocks.

18. A non-transitory computer-readable medium comprising computer-executable instructions which, when executed on a computing system cause the computing system to perform a method of tracing an emulated execution order of non-native instructions based on natively executing code on a computing system having a native instruction set architecture, the method comprising:

during emulated execution of non-native program code, maintaining a jump history in the computing system, the jump history including a listing of non-native jump instructions for which execution is emulated in the computing system, wherein the non-native program code is segmented into a plurality of virtual instruction blocks, wherein each of the plurality of virtual instruction blocks is segmented based at least in part on locations of non-native jump instructions and jump targets included in the non-native program code; and

for each of the non-native jump instructions included in the jump history:

accessing non-native program code including the non-native instructions to determine one or more non-native instructions executed between the non-native jump instruction and a last-executed non-native jump instruction; and

aggregating the non-native jump instruction and the one or more non-native instructions into an instruction trace.

19. A method of tracing an emulated execution order of non-native instructions based on natively executing code on a computing system having a native instruction set architecture, the method comprising:

during emulated execution of non-native program code, maintaining a jump history in the computing system, the jump history including a listing of non-native jump instructions for which execution is emulated in the computing system, wherein the one or more non-native instructions are included in a virtual instruction block, wherein the non-native program code is segmented into a plurality of virtual instruction blocks, wherein each of the plurality of virtual instruction blocks is segmented based at least in part on locations of non-native jump instructions and jump targets included in the non-native program code; and

for each of the non-native jump instructions included in the jump history:

accessing non-native program code including the non-native instructions to determine one or more non-native instructions executed between the non-native jump instruction and a last-executed non-native jump instruction; and

aggregating the non-native jump instruction and the one or more non-native instructions into an instruction trace.

20. The method of claim 19 , further comprising, during emulated execution of the non-native program code, capturing native statistics regarding execution of the native instructions that correspond to the non-native program code.