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CPreProcessor,C: skip #ifdef __cplusplus ~ #endif branch #2648

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Close #2647.

C parser doesn't work when C++ code "extern "C" {" and "}" is given.

    $ cat /tmp/extern-c.c
    extern "C" {
    #ifdef X
      void f() {}
    #else
      void g() {}
    #endif
    }
    $ u-ctags --output-format=xref --kinds-c=+plz --fields=+nie -o - /tmp/extern-c.c
    f                function      3 /tmp/extern-c.c  void f() {}

    $ cat /tmp/none-extern-c.c
    #ifdef X
      void f() {}
    #else
      void g() {}
    #endif
    $ u-ctags --output-format=xref --kinds-c=+plz --fields=+nie -o - /tmp/none-extern-c.c
    f                function      2 /tmp/none-extern-c.c void f() {}
    g                function      4 /tmp/none-extern-c.c void g() {}

The function g() is missed if the code is surrounded by extern "C" { and }.

This change uses a heuristic rule to skip the code in the C parser.

In most of cases, the code is in #ifdef __cplusplus ~ #endif branch.
So when the CPreProcessor parser detects #ifdef __cplusplus ~ #endif,
with this change, the CPreProcessor parser doesn't pass the code inside __cplusplus branch
to its client parser that requests to the CPreProcessor parser to do so.

C parser requests it. C++ parser doesn't.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
…ssed to cppInit()

cppInit takes too many arguments. To make the cppInit invocation
understandable, this change introduces cppInitData struct type. With
the type, a client parser can specify an argument with specifying the
name of field.

This change fixex a bug as a side effect.
The orders of parameters didn't matched between the declaration and
the implementation of cppInit().

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Close universal-ctags#2647.

C parser doesn't work when C++ code "extern "C" {" and "}" is given.

    $ cat /tmp/extern-c.c
    extern "C" {
    #ifdef X
      void f() {}
    #else
      void g() {}
    #endif
    }
    $ u-ctags --output-format=xref --kinds-c=+plz --fields=+nie -o - /tmp/extern-c.c
    f                function      3 /tmp/extern-c.c  void f() {}

    $ cat /tmp/none-extern-c.c
    #ifdef X
      void f() {}
    #else
      void g() {}
    #endif
    $ u-ctags --output-format=xref --kinds-c=+plz --fields=+nie -o - /tmp/none-extern-c.c
    f                function      2 /tmp/none-extern-c.c void f() {}
    g                function      4 /tmp/none-extern-c.c void g() {}

The function g() is missed if the code is surrounded by extern "C" { and }.

This change uses a heuristic rule to skip the code in the C parser.

In most of cases, the code is in #ifdef __cplusplus ~ #endif branch.
So when the CPreProcessor parser detects #ifdef __cplusplus ~ #endif,
with this change, the CPreProcessor parser doesn't pass the code inside __cplusplus branch
to its client parser that requests to the CPreProcessor parser to do so.

C parser requests it. C++ parser doesn't.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
@coveralls
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Coverage Status

Coverage increased (+0.002%) to 86.965% when pulling a26c377 on masatake:cpreprocessor-skip-cplusplus-branch into 23d50b5 on universal-ctags:master.

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codecov bot commented Sep 17, 2020

Codecov Report

Merging #2648 into master will increase coverage by 0.00%.
The diff coverage is 96.00%.

Impacted file tree graph

@@           Coverage Diff           @@
##           master    #2648   +/-   ##
=======================================
  Coverage   86.86%   86.87%           
=======================================
  Files         183      183           
  Lines       38973    38995   +22     
=======================================
+ Hits        33855    33875   +20     
- Misses       5118     5120    +2     
Impacted Files Coverage Δ
parsers/cpreprocessor.c 92.97% <93.33%> (-0.14%) ⬇️
parsers/asm.c 98.52% <100.00%> (+0.01%) ⬆️
parsers/c.c 76.42% <100.00%> (+0.08%) ⬆️
parsers/cxx/cxx_parser.c 85.47% <100.00%> (+0.04%) ⬆️
parsers/dts.c 100.00% <100.00%> (ø)
parsers/ldscript.c 88.31% <100.00%> (+0.04%) ⬆️
parsers/protobuf.c 97.48% <100.00%> (+0.01%) ⬆️

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C/C++: extern "c" will cause parse error
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