[cfe-dev] r347339 - [clang][Parse] Diagnose useless null statements / empty init-statements

Richard Smith via cfe-dev cfe-dev at lists.llvm.org
Wed Dec 5 10:43:19 PST 2018


On Wed, 5 Dec 2018, 10:01 George Karpenkov via cfe-commits <
cfe-commits at lists.llvm.org wrote:

> These are the cases I get:
>
> #define unexpected(a) { kprintf("unexpected %s:%d\n", __FILE__, __LINE__);
> a; }
>
> and
>
> #if 0
> #define DEBG(fmt, args...)      { IOLog(fmt, ## args); kprintf(fmt, ##
> args); }
> #else
> #define DEBG(fmt, args...)      {}
> #endif
>
> Now calls
>
> `DEBG(‘x’);` and `unexpected(‘msg’);`
>
> cause the warning to be fired.
> Of course, semicolon could be omitted, but the fact that the macro has
> braces is sort of an implementation detail.
>
> Greg Parker has pointed out it’s possible to rewrite the macros using the
> “do { … } while (0)”,
> but that is a lot of macros to change, and the resulting code would be
> arguably less readable.
>

That suggestion is the (or at least an) idiomatic way to write a
"statement-like" macro that expects a semicolon. The approach taken by the
above macros is often considered to be a macro antipattern (try putting it
in an unbraced if and adding an else clause, for example).

> On Dec 5, 2018, at 5:10 AM, Aaron Ballman <aaron at aaronballman.com> wrote:
>
> On Wed, Dec 5, 2018 at 1:40 AM Roman Lebedev <lebedev.ri at gmail.com> wrote:
>
>
> It is a problem in practice for us since we have projects which enable all
> available warnings and also enable “-Werror”.
>
> Hm, they have asked for -Weverything and they got it. Seems to be
> working as intended.
> When in previous discussions elsewhere i have talked about
> -Weverything, i was always
> been told that it isn't supposed to be used like that (admittedly, i
> *do* use it like that :)).
>
> Could you explain how is this different from any other warning that is
> considered pointless by the project?
> Why not simply disable it?
>
>
> You are right, it could be disabled. It’s just for this warning the noise
> vs. usefulness ratio seemed pretty low.
>
>
> Would you be okay with the warning if it was only diagnosed when the
> source location of the semi-colon is not immediately preceded by a
> macro expansion location? e.g.,
>
> EMPTY_EXPANSION(12); // Not diagnosed
> EMPTY_EXPANSION; // Not diagnosed
> ; // Diagnosed
>
> This could work provided that all empty space preceding the semicolon is
> ignored (as the macro could be separated by space(s) or newline(s).
> I’m not sure the complexity would be worth it, as I haven’t seen bugs
> arising from extra semicolons and empty statements,
> but it would take care of my use case.
>
>
> Or rather when the *previous* semicolon is coming from a macro.
>
> I don't like this. clang is already wa-a-ay too forgiving about
> macros, it almost ignores almost every warning in macros.
> It was an *intentional* decision to still warn on useless ';' after
> non-empty macros.
>
>
> I think I'm confused now. This is a test case:
>
> NULLMACRO(v7); // OK. This could be either GOODMACRO() or
> BETTERMACRO() situation, so we can't know we can drop it.
>
> So empty macro expansions should be ignored as I expected... so what
> is being diagnosed? George, can you provide a more clear example that
> demonstrates the issue?
>
> To be clear, I do *not* think this is a situation we should spend
> effort supporting (assuming "all available warnings" really means
> -Weverything and not something else):
>
> It is a problem in practice for us since we have projects which enable all
> available warnings and also enable “-Werror”.
>
>
> However, if we are diagnosing *empty* macro expansions followed by a
> semi-colon, I think that would be unacceptably chatty and is worth
> fixing on its own merits.
>
> ~Aaron
>
>
> ~Aaron
>
> Regards,
> George
>
> Roman.
>
> On Nov 20, 2018, at 10:59 AM, Roman Lebedev via cfe-commits <
> cfe-commits at lists.llvm.org> wrote:
>
> Author: lebedevri
> Date: Tue Nov 20 10:59:05 2018
> New Revision: 347339
>
> URL: http://llvm.org/viewvc/llvm-project?rev=347339&view=rev
> Log:
> [clang][Parse] Diagnose useless null statements / empty init-statements
>
> Summary:
> clang has `-Wextra-semi` (D43162), which is not dictated by the currently
> selected standard.
> While that is great, there is at least one more source of need-less semis
> - 'null statements'.
> Sometimes, they are needed:
> ```
> for(int x = 0; continueToDoWork(x); x++)
> ; // Ugly code, but the semi is needed here.
> ```
>
> But sometimes they are just there for no reason:
> ```
> switch(X) {
> case 0:
> return -2345;
> case 5:
> return 0;
> default:
> return 42;
> }; // <- oops
>
> ;;;;;;;;;;; <- OOOOPS, still not diagnosed. Clearly this is junk.
> ```
>
> Additionally:
> ```
> if(; // <- empty init-statement
>  true)
> ;
>
> switch (; // empty init-statement
>       x) {
> ...
> }
>
> for (; // <- empty init-statement
>    int y : S())
> ;
> }
>
> As usual, things may or may not go sideways in the presence of macros.
> While evaluating this diag on my codebase of interest, it was
> unsurprisingly
> discovered that Google Test macros are *very* prone to this.
> And it seems many issues are deep within the GTest itself, not
> in the snippets passed from the codebase that uses GTest.
>
> So after some thought, i decided not do issue a diagnostic if the semi
> is within *any* macro, be it either from the normal header, or system
> header.
>
> Fixes [[ https://bugs.llvm.org/show_bug.cgi?id=39111 | PR39111 ]]
>
> Reviewers: rsmith, aaron.ballman, efriedma
>
> Reviewed By: aaron.ballman
>
> Subscribers: cfe-commits
>
> Differential Revision: https://reviews.llvm.org/D52695
>
> Added:
>
>   cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt-in-init-statement.cpp
>   cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt.cpp
> Modified:
>   cfe/trunk/docs/ReleaseNotes.rst
>   cfe/trunk/include/clang/Basic/DiagnosticGroups.td
>   cfe/trunk/include/clang/Basic/DiagnosticParseKinds.td
>   cfe/trunk/include/clang/Parse/Parser.h
>   cfe/trunk/lib/Parse/ParseExprCXX.cpp
>   cfe/trunk/lib/Parse/ParseStmt.cpp
>
> Modified: cfe/trunk/docs/ReleaseNotes.rst
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/ReleaseNotes.rst?rev=347339&r1=347338&r2=347339&view=diff
>
> ==============================================================================
> --- cfe/trunk/docs/ReleaseNotes.rst (original)
> +++ cfe/trunk/docs/ReleaseNotes.rst Tue Nov 20 10:59:05 2018
> @@ -55,6 +55,63 @@ Major New Features
> Improvements to Clang's diagnostics
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> +- ``-Wextra-semi-stmt`` is a new diagnostic that diagnoses extra
> semicolons,
> +  much like ``-Wextra-semi``. This new diagnostic diagnoses all
> *unnecessary*
> +  null statements (expression statements without an expression), unless:
> the
> +  semicolon directly follows a macro that was expanded to nothing or if
> the
> +  semicolon is within the macro itself. This applies to macros defined in
> system
> +  headers as well as user-defined macros.
> +
> +  .. code-block:: c++
> +
> +      #define MACRO(x) int x;
> +      #define NULLMACRO(varname)
> +
> +      void test() {
> +        ; // <- warning: ';' with no preceding expression is a null
> statement
> +
> +        while (true)
> +          ; // OK, it is needed.
> +
> +        switch (my_enum) {
> +        case E1:
> +          // stuff
> +          break;
> +        case E2:
> +          ; // OK, it is needed.
> +        }
> +
> +        MACRO(v0;) // Extra semicolon, but within macro, so ignored.
> +
> +        MACRO(v1); // <- warning: ';' with no preceding expression is a
> null statement
> +
> +        NULLMACRO(v2); // ignored, NULLMACRO expanded to nothing.
> +      }
> +
> +- ``-Wempty-init-stmt`` is a new diagnostic that diagnoses empty
> init-statements
> +  of ``if``, ``switch``, ``range-based for``, unless: the semicolon
> directly
> +  follows a macro that was expanded to nothing or if the semicolon is
> within the
> +  macro itself (both macros from system headers, and normal macros). This
> +  diagnostic is in the ``-Wextra-semi-stmt`` group and is enabled in
> +  ``-Wextra``.
> +
> +  .. code-block:: c++
> +
> +      void test() {
> +        if(; // <- warning: init-statement of 'if' is a null statement
> +           true)
> +          ;
> +
> +        switch (; // <- warning: init-statement of 'switch' is a null
> statement
> +                x) {
> +          ...
> +        }
> +
> +        for (; // <- warning: init-statement of 'range-based for' is a
> null statement
> +             int y : S())
> +          ;
> +      }
> +
>
> Non-comprehensive list of changes in this release
> -------------------------------------------------
>
> Modified: cfe/trunk/include/clang/Basic/DiagnosticGroups.td
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticGroups.td?rev=347339&r1=347338&r2=347339&view=diff
>
> ==============================================================================
> --- cfe/trunk/include/clang/Basic/DiagnosticGroups.td (original)
> +++ cfe/trunk/include/clang/Basic/DiagnosticGroups.td Tue Nov 20 10:59:05
> 2018
> @@ -162,6 +162,8 @@ def GNUEmptyStruct : DiagGroup<"gnu-empt
> def ExtraTokens : DiagGroup<"extra-tokens">;
> def CXX98CompatExtraSemi : DiagGroup<"c++98-compat-extra-semi">;
> def CXX11ExtraSemi : DiagGroup<"c++11-extra-semi">;
> +def EmptyInitStatement : DiagGroup<"empty-init-stmt">;
> +def ExtraSemiStmt : DiagGroup<"extra-semi-stmt", [EmptyInitStatement]>;
> def ExtraSemi : DiagGroup<"extra-semi", [CXX98CompatExtraSemi,
>                                         CXX11ExtraSemi]>;
>
> @@ -768,7 +770,8 @@ def Extra : DiagGroup<"extra", [
>    MissingMethodReturnType,
>    SignCompare,
>    UnusedParameter,
> -    NullPointerArithmetic
> +    NullPointerArithmetic,
> +    EmptyInitStatement
>  ]>;
>
> def Most : DiagGroup<"most", [
>
> Modified: cfe/trunk/include/clang/Basic/DiagnosticParseKinds.td
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticParseKinds.td?rev=347339&r1=347338&r2=347339&view=diff
>
> ==============================================================================
> --- cfe/trunk/include/clang/Basic/DiagnosticParseKinds.td (original)
> +++ cfe/trunk/include/clang/Basic/DiagnosticParseKinds.td Tue Nov 20
> 10:59:05 2018
> @@ -53,6 +53,10 @@ def ext_extra_semi_cxx11 : Extension<
> def warn_extra_semi_after_mem_fn_def : Warning<
>  "extra ';' after member function definition">,
>  InGroup<ExtraSemi>, DefaultIgnore;
> +def warn_null_statement : Warning<
> +  "empty expression statement has no effect; "
> +  "remove unnecessary ';' to silence this warning">,
> +  InGroup<ExtraSemiStmt>, DefaultIgnore;
>
> def ext_thread_before : Extension<"'__thread' before '%0'">;
> def ext_keyword_as_ident : ExtWarn<
> @@ -554,6 +558,9 @@ def ext_for_range_init_stmt : ExtWarn<
> def warn_cxx17_compat_for_range_init_stmt : Warning<
>  "range-based for loop initialization statements are incompatible with "
>  "C++ standards before C++2a">, DefaultIgnore, InGroup<CXXPre2aCompat>;
> +def warn_empty_init_statement : Warning<
> +  "empty initialization statement of '%select{if|switch|range-based
> for}0' "
> +  "has no effect">, InGroup<EmptyInitStatement>, DefaultIgnore;
>
> // C++ derived classes
> def err_dup_virtual : Error<"duplicate 'virtual' in base specifier">;
>
> Modified: cfe/trunk/include/clang/Parse/Parser.h
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Parse/Parser.h?rev=347339&r1=347338&r2=347339&view=diff
>
> ==============================================================================
> --- cfe/trunk/include/clang/Parse/Parser.h (original)
> +++ cfe/trunk/include/clang/Parse/Parser.h Tue Nov 20 10:59:05 2018
> @@ -1888,6 +1888,7 @@ private:
>  StmtResult ParseCompoundStatement(bool isStmtExpr,
>                                    unsigned ScopeFlags);
>  void ParseCompoundStatementLeadingPragmas();
> +  bool ConsumeNullStmt(StmtVector &Stmts);
>  StmtResult ParseCompoundStatementBody(bool isStmtExpr = false);
>  bool ParseParenExprOrCondition(StmtResult *InitStmt,
>                                 Sema::ConditionResult &CondResult,
>
> Modified: cfe/trunk/lib/Parse/ParseExprCXX.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Parse/ParseExprCXX.cpp?rev=347339&r1=347338&r2=347339&view=diff
>
> ==============================================================================
> --- cfe/trunk/lib/Parse/ParseExprCXX.cpp (original)
> +++ cfe/trunk/lib/Parse/ParseExprCXX.cpp Tue Nov 20 10:59:05 2018
> @@ -1773,7 +1773,13 @@ Sema::ConditionResult Parser::ParseCXXCo
>    //   if (; true);
>    if (InitStmt && Tok.is(tok::semi)) {
>      WarnOnInit();
> -      SourceLocation SemiLoc = ConsumeToken();
> +      SourceLocation SemiLoc = Tok.getLocation();
> +      if (!Tok.hasLeadingEmptyMacro() && !SemiLoc.isMacroID()) {
> +        Diag(SemiLoc, diag::warn_empty_init_statement)
> +            << (CK == Sema::ConditionKind::Switch)
> +            << FixItHint::CreateRemoval(SemiLoc);
> +      }
> +      ConsumeToken();
>      *InitStmt = Actions.ActOnNullStmt(SemiLoc);
>      return ParseCXXCondition(nullptr, Loc, CK);
>    }
>
> Modified: cfe/trunk/lib/Parse/ParseStmt.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Parse/ParseStmt.cpp?rev=347339&r1=347338&r2=347339&view=diff
>
> ==============================================================================
> --- cfe/trunk/lib/Parse/ParseStmt.cpp (original)
> +++ cfe/trunk/lib/Parse/ParseStmt.cpp Tue Nov 20 10:59:05 2018
> @@ -930,6 +930,34 @@ void Parser::ParseCompoundStatementLeadi
>
> }
>
> +/// Consume any extra semi-colons resulting in null statements,
> +/// returning true if any tok::semi were consumed.
> +bool Parser::ConsumeNullStmt(StmtVector &Stmts) {
> +  if (!Tok.is(tok::semi))
> +    return false;
> +
> +  SourceLocation StartLoc = Tok.getLocation();
> +  SourceLocation EndLoc;
> +
> +  while (Tok.is(tok::semi) && !Tok.hasLeadingEmptyMacro() &&
> +         Tok.getLocation().isValid() && !Tok.getLocation().isMacroID()) {
> +    EndLoc = Tok.getLocation();
> +
> +    // Don't just ConsumeToken() this tok::semi, do store it in AST.
> +    StmtResult R = ParseStatementOrDeclaration(Stmts, ACK_Any);
> +    if (R.isUsable())
> +      Stmts.push_back(R.get());
> +  }
> +
> +  // Did not consume any extra semi.
> +  if (EndLoc.isInvalid())
> +    return false;
> +
> +  Diag(StartLoc, diag::warn_null_statement)
> +      << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
> +  return true;
> +}
> +
> /// ParseCompoundStatementBody - Parse a sequence of statements and invoke
> the
> /// ActOnCompoundStmt action.  This expects the '{' to be the current
> token, and
> /// consume the '}' at the end of the block.  It does not manipulate the
> scope
> @@ -992,6 +1020,9 @@ StmtResult Parser::ParseCompoundStatemen
>      continue;
>    }
>
> +    if (ConsumeNullStmt(Stmts))
> +      continue;
> +
>    StmtResult R;
>    if (Tok.isNot(tok::kw___extension__)) {
>      R = ParseStatementOrDeclaration(Stmts, ACK_Any);
> @@ -1588,10 +1619,15 @@ StmtResult Parser::ParseForStatement(Sou
>  ParsedAttributesWithRange attrs(AttrFactory);
>  MaybeParseCXX11Attributes(attrs);
>
> +  SourceLocation EmptyInitStmtSemiLoc;
> +
>  // Parse the first part of the for specifier.
>  if (Tok.is(tok::semi)) {  // for (;
>    ProhibitAttributes(attrs);
>    // no first part, eat the ';'.
> +    SourceLocation SemiLoc = Tok.getLocation();
> +    if (!Tok.hasLeadingEmptyMacro() && !SemiLoc.isMacroID())
> +      EmptyInitStmtSemiLoc = SemiLoc;
>    ConsumeToken();
>  } else if (getLangOpts().CPlusPlus && Tok.is(tok::identifier) &&
>             isForRangeIdentifier()) {
> @@ -1723,6 +1759,11 @@ StmtResult Parser::ParseForStatement(Sou
>                   : diag::ext_for_range_init_stmt)
>              << (FirstPart.get() ? FirstPart.get()->getSourceRange()
>                                  : SourceRange());
> +          if (EmptyInitStmtSemiLoc.isValid()) {
> +            Diag(EmptyInitStmtSemiLoc, diag::warn_empty_init_statement)
> +                << /*for-loop*/ 2
> +                << FixItHint::CreateRemoval(EmptyInitStmtSemiLoc);
> +          }
>        }
>      } else {
>        ExprResult SecondExpr = ParseExpression();
>
> Added:
> cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt-in-init-statement.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt-in-init-statement.cpp?rev=347339&view=auto
>
> ==============================================================================
> ---
> cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt-in-init-statement.cpp
> (added)
> +++
> cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt-in-init-statement.cpp
> Tue Nov 20 10:59:05 2018
> @@ -0,0 +1,64 @@
> +// RUN: %clang_cc1 -fsyntax-only -Wextra -std=c++2a -verify %s
> +// RUN: %clang_cc1 -fsyntax-only -Wextra-semi-stmt -std=c++2a -verify %s
> +// RUN: %clang_cc1 -fsyntax-only -Wempty-init-stmt -std=c++2a -verify %s
> +// RUN: cp %s %t
> +// RUN: %clang_cc1 -x c++ -Wempty-init-stmt -std=c++2a -fixit %t
> +// RUN: %clang_cc1 -x c++ -Wempty-init-stmt -std=c++2a -Werror %t
> +
> +struct S {
> +  int *begin();
> +  int *end();
> +};
> +
> +void naive(int x) {
> +  if (; true) // expected-warning {{empty initialization statement of
> 'if' has no effect}}
> +    ;
> +
> +  switch (; x) { // expected-warning {{empty initialization statement of
> 'switch' has no effect}}
> +  }
> +
> +  for (; int y : S()) // expected-warning {{empty initialization
> statement of 'range-based for' has no effect}}
> +    ;
> +
> +  for (;;) // OK
> +    ;
> +}
> +
> +#define NULLMACRO
> +
> +void with_null_macro(int x) {
> +  if (NULLMACRO; true)
> +    ;
> +
> +  switch (NULLMACRO; x) {
> +  }
> +
> +  for (NULLMACRO; int y : S())
> +    ;
> +}
> +
> +#define SEMIMACRO ;
> +
> +void with_semi_macro(int x) {
> +  if (SEMIMACRO true)
> +    ;
> +
> +  switch (SEMIMACRO x) {
> +  }
> +
> +  for (SEMIMACRO int y : S())
> +    ;
> +}
> +
> +#define PASSTHROUGHMACRO(x) x
> +
> +void with_passthrough_macro(int x) {
> +  if (PASSTHROUGHMACRO(;) true)
> +    ;
> +
> +  switch (PASSTHROUGHMACRO(;) x) {
> +  }
> +
> +  for (PASSTHROUGHMACRO(;) int y : S())
> +    ;
> +}
>
> Added: cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt.cpp?rev=347339&view=auto
>
> ==============================================================================
> --- cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt.cpp (added)
> +++ cfe/trunk/test/Parser/extra-semi-resulting-in-nullstmt.cpp Tue Nov 20
> 10:59:05 2018
> @@ -0,0 +1,96 @@
> +// RUN: %clang_cc1 -fsyntax-only -Wextra-semi-stmt -verify %s
> +// RUN: cp %s %t
> +// RUN: %clang_cc1 -x c++ -Wextra-semi-stmt -fixit %t
> +// RUN: %clang_cc1 -x c++ -Wextra-semi-stmt -Werror %t
> +
> +#define GOODMACRO(varname) int varname
> +#define BETTERMACRO(varname) GOODMACRO(varname);
> +#define NULLMACRO(varname)
> +
> +enum MyEnum {
> +  E1,
> +  E2
> +};
> +
> +void test() {
> +  ; // expected-warning {{empty expression statement has no effect;
> remove unnecessary ';' to silence this warning}}
> +  ;
> +
> +  // This removal of extra semi also consumes all the comments.
> +  // clang-format: off
> +  ;;;
> +  // clang-format: on
> +
> +  // clang-format: off
> +  ;NULLMACRO(ZZ);
> +  // clang-format: on
> +
> +  {}; // expected-warning {{empty expression statement has no effect;
> remove unnecessary ';' to silence this warning}}
> +
> +  {
> +    ; // expected-warning {{empty expression statement has no effect;
> remove unnecessary ';' to silence this warning}}
> +  }
> +
> +  if (true) {
> +    ; // expected-warning {{empty expression statement has no effect;
> remove unnecessary ';' to silence this warning}}
> +  }
> +
> +  GOODMACRO(v0); // OK
> +
> +  GOODMACRO(v1;) // OK
> +
> +  BETTERMACRO(v2) // OK
> +
> +  BETTERMACRO(v3;) // Extra ';', but within macro expansion, so ignored.
> +
> +  BETTERMACRO(v4); // expected-warning {{empty expression statement has
> no effect; remove unnecessary ';' to silence this warning}}
> +
> +  BETTERMACRO(v5;); // expected-warning {{empty expression statement has
> no effect; remove unnecessary ';' to silence this warning}}
> +
> +  NULLMACRO(v6) // OK
> +
> +  NULLMACRO(v7); // OK. This could be either GOODMACRO() or BETTERMACRO()
> situation, so we can't know we can drop it.
> +
> +  if (true)
> +    ; // OK
> +
> +  while (true)
> +    ; // OK
> +
> +  do
> +    ; // OK
> +  while (true);
> +
> +  for (;;) // OK
> +    ;      // OK
> +
> +  MyEnum my_enum;
> +  switch (my_enum) {
> +  case E1:
> +    // stuff
> +    break;
> +  case E2:; // OK
> +  }
> +
> +  for (;;) {
> +    for (;;) {
> +      goto contin_outer;
> +    }
> +  contin_outer:; // OK
> +  }
> +}
> +
> +;
> +
> +namespace NS {};
> +
> +void foo(int x) {
> +  switch (x) {
> +  case 0:
> +    [[fallthrough]];
> +  case 1:
> +    return;
> +  }
> +}
> +
> +[[]];
>
>
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