upstream/mercurial-mirror Files · mercurial/cffi/bdiffbuild.py

phases: avoid N² behavior in `advanceboundary`...

phases: avoid N² behavior in `advanceboundary` We allowed duplicated entries in the deque, which each entry could potentially insert all its ancestors. So advancing boundary for the full repository would mean each revision would walk all its ancestors, resulting in O(N²) iteration. For repository of any decent size, N² is quickly insane. We introduce a simple set to avoid this and get back to reasonable performance.

Gregory Szorc - - Load All Authors

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             bdiffbuild.py
        
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      import cffi

      import os

      ffi = cffi.FFI()

      with open(

          os.path.join(os.path.join(os.path.dirname(__file__), '..'), 'bdiff.c')

      ) as f:

          ffi.set_source(

              "mercurial.cffi._bdiff", f.read(), include_dirs=['mercurial']

          )

      ffi.cdef(

          """

      struct bdiff_line {

          int hash, n, e;

          ssize_t len;

          const char *l;

      };

      struct bdiff_hunk;

      struct bdiff_hunk {

          int a1, a2, b1, b2;

          struct bdiff_hunk *next;

      };

      int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr);

      int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,

          struct bdiff_hunk *base);

      void bdiff_freehunks(struct bdiff_hunk *l);

      void free(void*);

      """

      )

      if __name__ == '__main__':

          ffi.compile()

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				import cffi
				import os

				ffi = cffi.FFI()
				with open(
				os.path.join(os.path.join(os.path.dirname(__file__), '..'), 'bdiff.c')
				) as f:
				ffi.set_source(
				"mercurial.cffi._bdiff", f.read(), include_dirs=['mercurial']
				)
				ffi.cdef(
				"""
				struct bdiff_line {
				int hash, n, e;
				ssize_t len;
				const char *l;
				};

				struct bdiff_hunk;
				struct bdiff_hunk {
				int a1, a2, b1, b2;
				struct bdiff_hunk *next;
				};

				int bdiff_splitlines(const char a, ssize_t len, struct bdiff_line *lr);
				int bdiff_diff(struct bdiff_line a, int an, struct bdiff_line b, int bn,
				struct bdiff_hunk *base);
				void bdiff_freehunks(struct bdiff_hunk *l);
				void free(void*);
				"""
				)

				if __name__ == '__main__':
				ffi.compile()