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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Seemly this function can only remove implicit casts. There are some AST nodes, like CXXConstructExpr in the example, which will stick there.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://clang.llvm.org/doxygen/Stmt_8cpp_source.html#l00099">http://clang.llvm.org/doxygen/Stmt_8cpp_source.html#l00099</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Wei<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Eli Friedman [mailto:eli.friedman@gmail.com]
<br>
<b>Sent:</b> Tuesday, June 04, 2013 3:54 PM<br>
<b>To:</b> Pan, Wei<br>
<b>Cc:</b> clang-dev Developers<br>
<b>Subject:</b> Re: [cfe-dev] Remove implicitly generated AST nodes by Sema<o:p></o:p></span></p>
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<p class="MsoNormal">Expr::IgnoreImplicit() lets you easily look through implicit expressions.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-Eli<o:p></o:p></p>
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<p class="MsoNormal">On Tue, Jun 4, 2013 at 11:56 AM, Pan, Wei <<a href="mailto:wei.pan@intel.com" target="_blank">wei.pan@intel.com</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal">Hi all,<br>
<br>
I am wondering if it is possible to remove all the implicitly generated AST nodes.<br>
<br>
For example (below), the only argument to call (1) is a "DeclRefExpr" to y, and the only<br>
argument to call (2) is a "CXXContructExpr", if ignoring nodes created by the initialization<br>
sequence for the call.<br>
<br>
Basically, I want to get the "syntactic form" Expr from an expression with some semantic<br>
analysis. Is there an existing way to do so? Or what would be a proper way to implement this?<br>
<br>
Thanks!<br>
<br>
Wei<br>
<br>
------------------------------------------------------------------<br>
<br>
struct Y { };<br>
struct X { X(); X(Y&); };<br>
void foo(X);<br>
<br>
void bar(Y &y) {<br>
foo(y); // (1)<br>
foo(X(y)); // (2)<br>
}<br>
<br>
|-CallExpr 0x2a6c790 <line:8:3, col:8> 'void'<br>
| |-ImplicitCastExpr 0x2a6c778 <col:3> 'void (*)(struct X)' <FunctionToPointerDecay><br>
| | `-DeclRefExpr 0x2a6c728 <col:3> 'void (struct X)' lvalue Function 0x2a6c2c0 'foo' 'void (struct X)'<br>
| `-CXXConstructExpr 0x2a6c9f8 <col:7> 'struct X' 'void (const struct X &) throw()' elidable<br>
| `-MaterializeTemporaryExpr 0x2a6c988 <col:7> 'const struct X' lvalue<br>
| `-ImplicitCastExpr 0x2a6c970 <col:7> 'const struct X' <NoOp><br>
| `-ImplicitCastExpr 0x2a6c800 <col:7> 'struct X' <ConstructorConversion><br>
| `-CXXConstructExpr 0x2a6c7c8 <col:7> 'struct X' 'void (struct Y &)'<br>
| `-DeclRefExpr 0x2a6c500 <col:7> 'struct Y' lvalue ParmVar 0x2a6c380 'y' 'struct Y &'<br>
`-CallExpr 0x2a6cb60 <line:9:3, col:11> 'void'<br>
|-ImplicitCastExpr 0x2a6cb48 <col:3> 'void (*)(struct X)' <FunctionToPointerDecay><br>
| `-DeclRefExpr 0x2a6cb20 <col:3> 'void (struct X)' lvalue Function 0x2a6c2c0 'foo' 'void (struct X)'<br>
`-CXXConstructExpr 0x2a6cbc8 <col:7, col:10> 'struct X' 'void (const struct X &) throw()' elidable<br>
`-MaterializeTemporaryExpr 0x2a6cbb0 <col:7, col:10> 'const struct X' lvalue<br>
`-ImplicitCastExpr 0x2a6cb98 <col:7, col:10> 'const struct X' <NoOp><br>
`-CXXFunctionalCastExpr 0x2a6caf8 <col:7, col:10> 'struct X' functional cast to struct X <ConstructorConversion><br>
`-CXXConstructExpr 0x2a6cac0 <col:7, col:10> 'struct X' 'void (struct Y &)'<br>
`-DeclRefExpr 0x2a6ca98 <col:9> 'struct Y' lvalue ParmVar 0x2a6c380 'y' 'struct Y &'<br>
<br>
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