1. 25 Jun, 2012 1 commit
    • Leandro Melo's avatar
      C++: Core changes in preprocessing · d6ccffc0
      Leandro Melo authored
      Summary of most relevant items:
      - Preprocessor output format change. No more gen true/false. Instead
        a more intuitive and natural expansion (like from a real compiler) is
        performed directly corresponding to the macro invocation. Notice that
        information about the generated tokens is not lost, because it's now
        embedded in the expansion section header (in terms of lines and columns
        as explained in the code). In addition the location on where the macro
        expansion happens is also documented for future use.
      - Fix line control directives and associated token line numbers.
        This was not detected in tests cases because some of them were
        actually wrong: Within expansions the line information was being
        considered as originally computed in the macro definition, while
        the desired and expected for Creator's reporting mechanism (just
        like regular compilers) is the line from the expanded version
        of the tokens.
      - Do not allow for eager expansion. This was previously being done
        inside define directives. However, it's not allowed and might
        lead to incorrect results, since the argument substitution should
        only happen upon the macro invocation (and following nested ones).
        At least GCC and clang are consistent with that. See test case
        tst_Preprocessor:dont_eagerly_expand for a detailed explanation.
      - Revive the 'expanded' token flag. This is used to mark every token
        that originates from a macro expansion. Notice, however, that
        expanded tokens are not necessarily generated tokens (although
        every generated token is a expanded token). Expanded tokens that
        are not generated are those which are still considered by our
        code model features, since they are visible on the editor. The
        translation unit is smart enough to calculate line/column position
        for such tokens based on the information from the expansion section
      - How expansions are tracked has also changed. Now, we simply add
        two surrounding marker tokens to each "top-level" expansion
        sequence. There is an enumeration that control expansion states.
        Also, no "previous" token is kept around.
      - Preprocessor client methods suffered a change in signature so
        they now receive the line number of the action in question as
        a paramater. Previously such line could be retrieved by the client
        implementation by accessing the environment line. However, this
        is not reliable because we try to avoid synchronization of the
        output/environment lines in order to avoid unnecessary output,
        while expanding macros or handling preprocessor directives.
      - Although macros are not expanded during define directives (as
        mentioned above) the preprocessor client is now "notified"
        when it sees a macro. This is to allow usage tracking.
      - Other small stuff.
      This is all in one patch because the fixes are a consequence
      of the change in preprocessing control.
      Change-Id: I8f4c6e6366f37756ec65d0a93b79f72a3ac4ed50
      Reviewed-by: default avatarRoberto Raggi <roberto.raggi@nokia.com>
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    • Roberto Raggi's avatar
      Removed the MacroResolver · 77aa3064
      Roberto Raggi authored
      Unfortunately, the MacroResolver does not scale and we get pretty bad performances when parsing big projects.
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