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<p>Hi Erik,</p>
<p><br>
</p>
<p>Thanks very much for the quick reply and the great answer! I will try elaborate on my first question a little bit to try and clear it up (I apologise if it doesn't, I'm not great for explanations). </p>
<p><br>
</p>
<p>Within SemaType.cpp some of the type attributes take in integer parameters, however they can not be dependent or value dependent (for example by a template'd const int) as shown by the below snippet from the HandleVectorSizeAttr function which will emit
an error if its tried: </p>
<p><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Expr.html" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">Expr</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">
*sizeExpr = </span><span class="keyword" style="color: rgb(0, 128, 0); font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">static_cast<</span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Expr.html" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">Expr</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">
*</span><span class="keyword" style="color: rgb(0, 128, 0); font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">></span><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">(Attr.</span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1AttributeList.html#a265d2e7800361a5124d7455fdd432424" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">getArgAsExpr</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">(0));</span></p>
<p><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">llvm::APSInt
vecSize(32);</span><br>
</span></p>
<p><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span class="keywordflow" style="color: rgb(224, 128, 0); font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">if</span><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">
(sizeExpr-></span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Expr.html#a48cd7038510f42d44e314d1b8d294824" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">isTypeDependent</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">()
|| sizeExpr-></span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Expr.html#a34f1652a9072dfd3c7119d23e1a14fa5" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">isValueDependent</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">()
|| <span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">
!sizeExpr-></span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Expr.html#a664cbf5948aae551f2080170628ea5ac" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">isIntegerConstantExpr</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">(vecSize,
S.</span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Sema.html#a3ccddacb1f4f71b084296175cc9e5b0e" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">Context</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">))
{ <span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">
S.</span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Sema.html#ad29dfd1f2677772bf6b1da186a7583c3" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">Diag</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">(Attr.</span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1AttributeList.html#a764e55754a52aa43b991dbbb24fa1450" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">getLoc</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">(),
diag::err_attribute_argument_type)</span><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><< Attr.</span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1AttributeList.html#ad33e72a3989e9a61697da22d0211bf15" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">getName</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">()
<< </span><a class="code" href="http://clang.llvm.org/doxygen/namespaceclang.html#a702b0ec61c5bb9df98d3364a170c0dfca026f679d45ce5b7f618b89ac18d8595e" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">AANT_ArgumentIntegerConstant</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">
<< sizeExpr-></span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1Stmt.html#a6844392ee6148b5fe821f211b95e5d1b" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">getSourceRange</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">();</span><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">
Attr.</span><a class="code" href="http://clang.llvm.org/doxygen/classclang_1_1AttributeList.html#ad2ce5246eed483669e582893448602d8" style="color: rgb(70, 101, 162); text-decoration: none; font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">setInvalid</a><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">();</span></span></span></span></span></p>
<p><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span class="keywordflow" style="color: rgb(224, 128, 0); font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">return</span><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">;</span></span></span><br>
</span></span></p>
<p><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);"><span style="font-family: monospace, fixed; font-size: 13px; text-indent: -53px; white-space: pre-wrap; background-color: rgb(251, 252, 253);">}</span></span></span></span></span></p>
<p><br>
</p>
<p>So for example code like the below would not be use-able:</p>
<p>template <const int n> </p>
<p>void foo()</p>
<p>{</p>
<p> int *__attribute__((aligned(n))) test;<span style="background-color:rgb(239,240,241); color:rgb(57,51,24); font-family:Consolas,Menlo,Monaco,"Lucida Console","Liberation Mono","DejaVu Sans Mono","Bitstream Vera Sans Mono","Courier New",monospace,sans-serif; font-size:13px"></span></p>
<p>} </p>
<p><br>
</p>
<p>I was wondering if it's possible to try and do an early instantiation of the n parameter (sizeExpr in the context of the SemaType.cpp function) within the HandleXXXAttr function (or delay parsing until it can similar to the DeclAttr's in SemaDeclAttr) and
get the value out of it rather than emit a diagnostic error. I imagine it isn't possible, but I thought I'd ask just in-case!</p>
<p><br>
</p>
<p>Best Regards,</p>
<p>Andrew</p>
</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Erik Pilkington <erik.pilkington@gmail.com><br>
<b>Sent:</b> 24 December 2016 03:26:24<br>
<b>To:</b> Andrew Gozillon<br>
<b>Cc:</b> cfe-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [cfe-dev] Newbie Related Dependency Questions</font>
<div> </div>
</div>
<div><br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Dec 23, 2016, at 8:02 PM, Andrew Gozillon via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" class="">cfe-dev@lists.llvm.org</a>> wrote:</div>
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<p class="" style="margin-top:0px; margin-bottom:0px"></p>
<div class="">Hi,</div>
<div class=""><br class="">
</div>
<div class="">I'm pretty new to working/tinkering with the Clang compiler, so I'm sorry ahead of time if these questions aren't relevant to this mailing list or seem silly. </div>
</div>
</div>
</blockquote>
<div><br class="">
</div>
<div>Welcome! No need to apologize :)</div>
<br class="">
<blockquote type="cite" class="">
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<div class="">My first question is mainly, is it at all possible to instantiate a non-type template based Expr during the type formation stage and if so would it be possible to get pointed in the right direction to do it? (for example inside one of the Attributes
that intake an integer parameter). Or is it impossible/incorrect to rely on a dependent parameter at this stage (I have noticed most things throw a diagnostic error if the value is dependent or type dependent)? </div>
</div>
</div>
</blockquote>
<div><br class="">
</div>
<div>I’m not sure what your asking here. Maybe you could provide some example code?</div>
<div class=""><br class="">
</div>
<blockquote type="cite" class="">
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<div class="">My other possibly more difficult to answer question is how (or where in the source code if that's even possible) is dependency passed upwards to parent statements/expressions (types in general)? For example if I have a std::same_as with a parameter
that is dependent the std::same_as will also by extension be dependent until its child is no longer dependent. </div>
</div>
</div>
</blockquote>
<div><br class="">
</div>
<div>
<div>There is a bit in every Type that represents if it is dependent. For example, in:</div>
<div><font face="Monaco" class=""><br class="">
</font></div>
<div><font face="Monaco" class="">template <class Type> void f() {</font></div>
<div><font face="Monaco" class=""> Type D;</font></div>
<div><font face="Monaco" class=""> std::same_as(D, 42);</font></div>
<div><font face="Monaco" class="">}</font></div>
<div><br class="">
</div>
<div>During Sema of the CallExpr (Sema::ActOnCallExpr) to std::same_as, we check if any of the argument types are dependent, and if so we leave the type of the call as dependent, to be resolved during instantiation (This is done in SemaExpr.cpp:5196). This
bit is set for the type of the subexpression D, and for the type of the call expression, but not for the type of the subexpression 42. Semantic analysis works bottom up from the perspective of the AST, so we’ve ActOn’d both D and 42 by the time we ActOn the
CallExpr, meaning we can propagate dependent types up the AST as it is being constructed. Hope that answers your question.</div>
<div class=""><br class="">
</div>
</div>
<blockquote type="cite" class="">
<div class="">
<div id="divtagdefaultwrapper" dir="ltr" class="" style="font-style:normal; font-weight:normal; letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif">
<div class="">Again sorry if these questions are out of context for this mailing list and thank you very much for your time.</div>
<div class=""><br class="">
</div>
<div class="">Best Regards,</div>
<div class="">Andrew</div>
<br class="">
<p class="" style="margin-top:0px; margin-bottom:0px"></p>
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Please consider the environment and think before you print. <br>
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The University of the West of Scotland is a registered Scottish charity. Charity number SC002520.
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Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the University of the West of Scotland.
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As a public body, the University of the West of Scotland may be required to make available emails as well as other written forms of information as a result of a request made under the Freedom of Information (Scotland) Act 2002.
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