You can probably find an IDE plugin that inlines the assembly for a c function. Most ids can show the assembly side by side with your c code so it wouldn't be

You can probably find an IDE plugin that inlines the assembly for a c function. Most ids can show the assembly side by side with your c code so it wouldn't be that much of a step. To fulfill your vision you would also need a decompiler (and an inliner) to convert a block of assembly back into C if a corresponding C routine exists.