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Assertion `!isValueDependent() && "Cannot get the length of a value-dependent pack size expression"' failed #283

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fitzgen opened this issue Nov 18, 2016 · 2 comments
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Assertion `!isValueDependent() && "Cannot get the length of a value-dependent pack size expression"' failed #283

fitzgen opened this issue Nov 18, 2016 · 2 comments

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@fitzgen
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fitzgen commented Nov 18, 2016

Getting this assertion failure from inside clang when I updated my bindgen for the SpiderMonkey bindings work I've been doing.

My best guess is that this is related to the macro expression parsing stuff?

cc @emilio

Here is a backtrace:

(rr) bt
#0  0x0000000070000002 in ?? ()
#1  0x00007fdcdc80dd2f in _raw_syscall () at ../src/preload/raw_syscall.S:120
#2  0x00007fdcdc80b389 in traced_raw_syscall (call=<optimized out>) at ../src/preload/preload.c:282
#3  sys_futex (call=<optimized out>) at ../src/preload/preload.c:1450
#4  syscall_hook_internal (call=0x7ffdecb72ab8) at ../src/preload/preload.c:2330
#5  0x00007fdcdc809be1 in syscall_hook (call=0x7ffdecb72ab8) at ../src/preload/preload.c:2406
#6  0x00007fdcdc80dd5a in _syscall_hook_trampoline () at ../src/preload/syscall_hook.S:170
#7  0x00007fdcdc80dd79 in _syscall_hook_trampoline_48_3d_00_f0_ff_ff () at ../src/preload/syscall_hook.S:226
#8  0x00007fdcd3b6a6fb in raise () from /lib64/libc.so.6
#9  0x00007fdcd3b6c2fa in abort () from /lib64/libc.so.6
#10 0x00007fdcd3b62f97 in __assert_fail_base () from /lib64/libc.so.6
#11 0x00007fdcd3b63042 in __assert_fail () from /lib64/libc.so.6
#12 0x00007fdcd4ba3cb6 in clang::SizeOfPackExpr::getPackLength (this=0x7fdcd1500b18)
    at /home/fitzgen/src/llvm/tools/clang/include/clang/AST/ExprCXX.h:3731
#13 0x00007fdcd4b54470 in (anonymous namespace)::IntExprEvaluator::VisitSizeOfPackExpr (this=0x7ffdecb72f00, E=0x7fdcd1500b18)
    at /home/fitzgen/src/llvm/tools/clang/lib/AST/ExprConstant.cpp:8171
#14 0x00007fdcd4b6e209 in clang::StmtVisitorBase<clang::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit
    (this=0x7ffdecb72f00, S=0x7fdcd1500b18) at /home/fitzgen/src/llvm/obj/tools/clang/include/clang/AST/StmtNodes.inc:755
#15 0x00007fdcd4b58ff4 in Evaluate (Result=..., Info=..., E=0x7fdcd1500b18)
    at /home/fitzgen/src/llvm/tools/clang/lib/AST/ExprConstant.cpp:8996
#16 0x00007fdcd4b598c7 in EvaluateAsRValue (Info=..., E=0x7fdcd1500b18, Result=...)
    at /home/fitzgen/src/llvm/tools/clang/lib/AST/ExprConstant.cpp:9085
#17 0x00007fdcd4b59c84 in clang::Expr::EvaluateAsRValue (this=0x7fdcd1500b18, Result=..., Ctx=...)
    at /home/fitzgen/src/llvm/tools/clang/lib/AST/ExprConstant.cpp:9140
#18 0x00007fdcd4927261 in evaluateExpr (expr=0x7fdcd1500b18, C=...)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:3522
#19 0x00007fdcd4927f13 in clang_Cursor_Evaluate (C=...) at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:3666
#20 0x0000558a537dcab5 in libbindgen::clang::EvalResult::new (cursor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:1301
#21 0x0000558a537d75c0 in libbindgen::clang::Cursor::evaluate (self=0x7ffdecb74b98)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:481
#22 0x0000558a537fc808 in libbindgen::ir::var::{{impl}}::parse (cursor=..., ctx=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/var.rs:211
#23 0x0000558a537f0276 in libbindgen::ir::item::{{impl}}::parse (cursor=..., parent_id=..., ctx=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/item.rs:794
#24 0x0000558a5384816c in libbindgen::ir::comp::{{impl}}::from_ty::{{closure}} (cur=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/comp.rs:730
#25 0x0000558a537d7794 in libbindgen::clang::visit_children<closure> (cur=..., _parent=..., data=0x7ffdecb776c8)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:496
#26 0x00007fdcd491a80f in clang::cxcursor::CursorVisitor::Visit (this=0x7ffdecb77510, Cursor=..., 
    CheckedRegionOfInterest=true) at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:208
#27 0x00007fdcd491c1bd in clang::cxcursor::CursorVisitor::handleDeclForVisitation (this=0x7ffdecb77510, D=0x7fdcd1500ab8)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:665
#28 0x00007fdcd491bf17 in clang::cxcursor::CursorVisitor::VisitDeclContext (this=0x7ffdecb77510, DC=0x7fdcd15006b8)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:626
#29 0x00007fdcd491c3ad in clang::cxcursor::CursorVisitor::VisitTagDecl (this=0x7ffdecb77510, D=0x7fdcd1500680)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:696
#30 0x00007fdcd4920821 in clang::cxcursor::CursorVisitor::VisitCXXRecordDecl (this=0x7ffdecb77510, D=0x7fdcd1500680)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:1734
#31 0x00007fdcd491d1bb in clang::cxcursor::CursorVisitor::VisitClassTemplateDecl (this=0x7ffdecb77510, D=0x7fdcd1500718)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:917
#32 0x00007fdcd4950fff in clang::declvisitor::Base<clang::declvisitor::make_ptr, clang::cxcursor::CursorVisitor, bool>::Visit
    (this=0x7ffdecb77510, D=0x7fdcd1500718) at /home/fitzgen/src/llvm/obj/tools/clang/include/clang/AST/DeclNodes.inc:189
#33 0x00007fdcd491b6c4 in clang::cxcursor::CursorVisitor::VisitChildren (this=0x7ffdecb77510, Cursor=...)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:497
#34 0x00007fdcd4929612 in clang_visitChildren (parent=..., 
    visitor=0x558a537d75e0 <libbindgen::clang::visit_children<closure>>, client_data=0x7ffdecb776c8)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:4040
#35 0x0000558a537d6518 in libbindgen::clang::Cursor::visit<closure> (self=0x7ffdecb77e78, visitor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:314
#36 0x0000558a537dfce8 in libbindgen::ir::comp::CompInfo::from_ty (potential_id=..., ty=0x7ffdecb7c478, location=..., 
    ctx=0x7ffdecb82d58) at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/comp.rs:519
#37 0x0000558a537f82c8 in libbindgen::ir::ty::Type::from_clang_ty (potential_id=..., ty=0x7ffdecb7c478, location=..., 
    parent_id=..., ctx=0x7ffdecb82d58) at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/ty.rs:616
#38 0x0000558a537f2e3b in libbindgen::ir::item::{{impl}}::from_ty_with_id (id=..., ty=0x7ffdecb7c478, location=..., 
    parent_id=..., ctx=0x7ffdecb82d58) at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/item.rs:977
#39 0x0000558a537f247f in libbindgen::ir::item::{{impl}}::from_ty (ty=0x7ffdecb7c478, location=..., parent_id=..., 
    ctx=0x7ffdecb82d58) at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/item.rs:910
#40 0x0000558a537f07c7 in libbindgen::ir::item::{{impl}}::parse (cursor=..., parent_id=..., ctx=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/item.rs:800
#41 0x0000558a5380070e in libbindgen::parse_one (ctx=0x7ffdecb82d58, cursor=..., parent=..., children=0x7ffdecb7dfb8)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:555
#42 0x0000558a538492d5 in libbindgen::ir::module::{{impl}}::parse::{{closure}}::{{closure}} (cursor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/module.rs:52
#43 0x0000558a537d8b84 in libbindgen::clang::visit_children<closure> (cur=..., _parent=..., data=0x7ffdecb7de18)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:496
#44 0x00007fdcd491a80f in clang::cxcursor::CursorVisitor::Visit (this=0x7ffdecb7dc70, Cursor=..., 
    CheckedRegionOfInterest=true) at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:208
#45 0x00007fdcd491c1bd in clang::cxcursor::CursorVisitor::handleDeclForVisitation (this=0x7ffdecb7dc70, D=0x7fdcd1500718)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:665
#46 0x00007fdcd491bf17 in clang::cxcursor::CursorVisitor::VisitDeclContext (this=0x7ffdecb7dc70, DC=0x7fdcd14eee50)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:626
#47 0x00007fdcd491e377 in clang::cxcursor::CursorVisitor::VisitNamespaceDecl (this=0x7ffdecb7dc70, D=0x7fdcd14eee28)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:1187
#48 0x00007fdcd4950ef7 in clang::declvisitor::Base<clang::declvisitor::make_ptr, clang::cxcursor::CursorVisitor, bool>::Visit
    (this=0x7ffdecb7dc70, D=0x7fdcd14eee28) at /home/fitzgen/src/llvm/obj/tools/clang/include/clang/AST/DeclNodes.inc:99
#49 0x00007fdcd491b6c4 in clang::cxcursor::CursorVisitor::VisitChildren (this=0x7ffdecb7dc70, Cursor=...)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:497
#50 0x00007fdcd4929612 in clang_visitChildren (parent=..., 
    visitor=0x558a537d89d0 <libbindgen::clang::visit_children<closure>>, client_data=0x7ffdecb7de18)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:4040
#51 0x0000558a537d66b2 in libbindgen::clang::Cursor::visit<closure> (self=0x7ffdecb7e158, visitor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:314
#52 0x0000558a5384b19c in libbindgen::ir::module::{{impl}}::parse::{{closure}} (ctx=0x7ffdecb82d58, children=0x7ffdecb7dfb8)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/module.rs:51
#53 0x0000558a537e946a in libbindgen::ir::context::BindgenContext::with_module<closure> (self=0x7ffdecb82d58, module_id=..., 
    cb=...) at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/context.rs:907
#54 0x0000558a537f54b0 in libbindgen::ir::module::{{impl}}::parse (cursor=..., ctx=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/module.rs:50
#55 0x0000558a537ef9fe in libbindgen::ir::item::{{impl}}::parse (cursor=..., parent_id=..., ctx=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/item.rs:784
#56 0x0000558a5380070e in libbindgen::parse_one (ctx=0x7ffdecb82d58, cursor=..., parent=..., children=0x7ffdecb80158)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:555
#57 0x0000558a538492d5 in libbindgen::ir::module::{{impl}}::parse::{{closure}}::{{closure}} (cursor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/module.rs:52
#58 0x0000558a537d8b84 in libbindgen::clang::visit_children<closure> (cur=..., _parent=..., data=0x7ffdecb7ffb8)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:496
#59 0x00007fdcd491a80f in clang::cxcursor::CursorVisitor::Visit (this=0x7ffdecb7fe10, Cursor=..., 
    CheckedRegionOfInterest=true) at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:208
#60 0x00007fdcd491c1bd in clang::cxcursor::CursorVisitor::handleDeclForVisitation (this=0x7ffdecb7fe10, D=0x7fdcd14eee28)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:665
#61 0x00007fdcd491bf17 in clang::cxcursor::CursorVisitor::VisitDeclContext (this=0x7ffdecb7fe10, DC=0x7fdcd14eea58)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:626
#62 0x00007fdcd491e377 in clang::cxcursor::CursorVisitor::VisitNamespaceDecl (this=0x7ffdecb7fe10, D=0x7fdcd14eea30)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:1187
#63 0x00007fdcd4950ef7 in clang::declvisitor::Base<clang::declvisitor::make_ptr, clang::cxcursor::CursorVisitor, bool>::Visit
    (this=0x7ffdecb7fe10, D=0x7fdcd14eea30) at /home/fitzgen/src/llvm/obj/tools/clang/include/clang/AST/DeclNodes.inc:99
#64 0x00007fdcd491b6c4 in clang::cxcursor::CursorVisitor::VisitChildren (this=0x7ffdecb7fe10, Cursor=...)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:497
#65 0x00007fdcd4929612 in clang_visitChildren (parent=..., 
    visitor=0x558a537d89d0 <libbindgen::clang::visit_children<closure>>, client_data=0x7ffdecb7ffb8)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:4040
#66 0x0000558a537d66b2 in libbindgen::clang::Cursor::visit<closure> (self=0x7ffdecb802f8, visitor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:314
#67 0x0000558a5384b19c in libbindgen::ir::module::{{impl}}::parse::{{closure}} (ctx=0x7ffdecb82d58, children=0x7ffdecb80158)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/module.rs:51
#68 0x0000558a537e946a in libbindgen::ir::context::BindgenContext::with_module<closure> (self=0x7ffdecb82d58, module_id=..., 
    cb=...) at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/context.rs:907
#69 0x0000558a537f54b0 in libbindgen::ir::module::{{impl}}::parse (cursor=..., ctx=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/module.rs:50
#70 0x0000558a537ef9fe in libbindgen::ir::item::{{impl}}::parse (cursor=..., parent_id=..., ctx=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/item.rs:784
#71 0x0000558a5380070e in libbindgen::parse_one (ctx=0x7ffdecb82d58, cursor=..., parent=..., children=0x7ffdecb822a0)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:555
#72 0x0000558a53849728 in libbindgen::parse::{{closure}}::{{closure}} (cursor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:583
#73 0x0000558a537d8f24 in libbindgen::clang::visit_children<closure> (cur=..., _parent=..., data=0x7ffdecb82108)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:496
#74 0x00007fdcd491a80f in clang::cxcursor::CursorVisitor::Visit (this=0x7ffdecb81f60, Cursor=..., 
    CheckedRegionOfInterest=true) at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:208
#75 0x00007fdcd491c1bd in clang::cxcursor::CursorVisitor::handleDeclForVisitation (this=0x7ffdecb81f60, D=0x7fdcd14eea30)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:665
#76 0x00007fdcd491bf17 in clang::cxcursor::CursorVisitor::VisitDeclContext (this=0x7ffdecb81f60, DC=0x7fdcd2a9d2f0)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:626
#77 0x00007fdcd491b976 in clang::cxcursor::CursorVisitor::VisitChildren (this=0x7ffdecb81f60, Cursor=...)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:531
#78 0x00007fdcd4929612 in clang_visitChildren (parent=..., 
    visitor=0x558a537d8d70 <libbindgen::clang::visit_children<closure>>, client_data=0x7ffdecb82108)
    at /home/fitzgen/src/llvm/tools/clang/tools/libclang/CIndex.cpp:4040
#79 0x0000558a537d6a39 in libbindgen::clang::Cursor::visit<closure> (self=0x7ffdecb82470, visitor=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/clang.rs:314
#80 0x0000558a5384b211 in libbindgen::parse::{{closure}} (context=0x7ffdecb82d58, children=0x7ffdecb822a0)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:583
#81 0x0000558a537e974e in libbindgen::ir::context::BindgenContext::with_module<closure> (self=0x7ffdecb82d58, module_id=..., 
    cb=...) at /home/fitzgen/src/rust-bindgen/libbindgen/src/ir/context.rs:907
#82 0x0000558a53800b5e in libbindgen::parse (context=0x7ffdecb82d58)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:582
#83 0x0000558a537fed61 in libbindgen::Bindings::generate (options=..., span=...)
    at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:449
#84 0x0000558a537fe5b6 in libbindgen::Builder::generate (self=...) at /home/fitzgen/src/rust-bindgen/libbindgen/src/lib.rs:285
#85 0x0000558a536aed31 in bindgen::main () at /home/fitzgen/src/rust-bindgen/src/main.rs:72
#86 0x0000558a53fcaee7 in __rust_maybe_catch_panic ()
#87 0x0000558a53fc1bc2 in std::rt::lang_start::h14cbded5fe3cd915 ()
#88 0x0000558a536b0f34 in main ()
@fitzgen
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fitzgen commented Nov 18, 2016

Unclear to me whether this is a bug in clang or our usage of libclang.

@fitzgen
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fitzgen commented Nov 18, 2016

Ok, took creduce a little longer than usual, but here is a reduced test case:

template <typename... T>
struct B {
    static const long c = sizeof...(T);
};

Although we can't make proper Rust bindings to variadic templates, we definitely shouldn't be triggering assertions in libclang and dumping core.

fitzgen added a commit to fitzgen/rust-bindgen that referenced this issue Nov 19, 2016
@fitzgen
Do not evaluate variadic template types
04384c3 
This is a workaround for an internal clang assertion that gets triggered
if we try to evaluate a variadic template type reference.

Fixes rust-lang#283
@fitzgen fitzgen mentioned this issue Nov 19, 2016
Merged
fitzgen added a commit to fitzgen/rust-bindgen that referenced this issue Nov 19, 2016
@fitzgen
Do not evaluate variadic template types
80ac773 
This is a workaround for an internal clang assertion that gets triggered
if we try to evaluate a variadic template type reference.

Fixes rust-lang#283
fitzgen added a commit to fitzgen/rust-bindgen that referenced this issue Nov 19, 2016
@fitzgen
Do not evaluate variadic template types
e3649e2 
This is a workaround for an internal clang assertion that gets triggered
if we try to evaluate a variadic template type reference.

Fixes rust-lang#283
fitzgen added a commit to fitzgen/rust-bindgen that referenced this issue Nov 19, 2016
@fitzgen
Do not evaluate variadic template types
1c18ec7 
This is a workaround for an internal clang assertion that gets triggered
if we try to evaluate a variadic template type reference.

Fixes rust-lang#283
bors-servo pushed a commit that referenced this issue Nov 21, 2016
Auto merge of #284 - fitzgen:dont-eval-variadic-templates, r=emilio
94fff83 
Do not evaluate variadic template types

This is a workaround for an internal clang assertion that gets triggered
if we try to evaluate a variadic template type reference.

Fixes #283

r? @emilio
luser pushed a commit to luser/rust-bindgen that referenced this issue Mar 27, 2017
@nox
Merge pull request rust-lang#283 from crabtw/improve-travis
6d86d1e 
Switch Travis support to a proper build matrix
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