[cfe-commits] r111776 - in /cfe/trunk: lib/CodeGen/CGCXX.cpp lib/CodeGen/CGCXXABI.h lib/CodeGen/CGExpr.cpp lib/CodeGen/CGExprAgg.cpp lib/CodeGen/CGExprCXX.cpp lib/CodeGen/CGExprConstant.cpp lib/CodeGen/CGExprScalar.cpp lib/CodeGen/CodeGenFunction.cpp lib/CodeGen/ItaniumCXXABI.cpp lib/CodeGen/MicrosoftCXXABI.cpp lib/CodeGen/TargetInfo.cpp test/CodeGenCXX/member-function-pointers.cpp test/CodeGenCXX/x86_32-arguments.cpp

Douglas Gregor dgregor at apple.com
Sun Aug 22 11:27:13 PDT 2010 

On Aug 22, 2010, at 10:58 AM, Douglas Gregor wrote:

> 
> On Aug 22, 2010, at 3:59 AM, John McCall wrote:
> 
>> Author: rjmccall
>> Date: Sun Aug 22 05:59:02 2010
>> New Revision: 111776
>> 
>> URL: http://llvm.org/viewvc/llvm-project?rev=111776&view=rev
>> Log:
>> Experiment with using first-class aggregates to represent member function
>> pointers.  I find the resulting code to be substantially cleaner, and it
>> makes it very easy to use the same APIs for data member pointers (which I have
>> conscientiously avoided here), and it avoids a plethora of potential
>> inefficiencies due to excessive memory copying, but we'll have to see if it
>> actually works.
> 
> FYI, this is breaking self-host on Darwin, with:
> 
> clang: /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.src/tools/clang/lib/CodeGen/CGExprScalar.cpp:576: llvm::Value*<unnamed>::ScalarExprEmitter::EmitNullValue(clang::QualType): Assertion `!Ty->isMemberFunctionPointerType() && "member function pointers are not scalar!"' failed.
> 0  clang           0x00000000015ffdff
> 1  clang           0x0000000001601e82
> 2  libpthread.so.0 0x00002b91603b9f60
> 3  libc.so.6       0x00002b9160fab175 gsignal + 53
> 4  libc.so.6       0x00002b9160fadf80 abort + 384
> 5  libc.so.6       0x00002b9160fa42b1 __assert_fail + 241
> 6  clang           0x00000000007d5379
> 7  clang           0x00000000007db837
> 8  clang           0x00000000007df087 clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) + 87
> 9  clang           0x00000000007b52a7 clang::CodeGen::CodeGenFunction::EmitAnyExpr(clang::Expr const*, llvm::Value*, bool, bool, bool) + 247
> 10 clang           0x00000000007b538e clang::CodeGen::CodeGenFunction::EmitAnyExprToTemp(clang::Expr const*, bool, bool) + 78
> 11 clang           0x0000000000780341 clang::CodeGen::CodeGenFunction::EmitCallArg(clang::Expr const*, clang::QualType) + 65
> 12 clang           0x00000000007c9adf void clang::CodeGen::CodeGenFunction::EmitCallArgs<clang::FunctionProtoType>(llvm::SmallVector<std::pair<clang::CodeGen::RValue, clang::QualType>, 16u>&, clang::FunctionProtoType const*, clang::ConstExprIterator, clang::ConstExprIterator) + 527
> 13 clang           0x00000000007c35a4 clang::CodeGen::CodeGenFunction::EmitCXXMemberCall(clang::CXXMethodDecl const*, llvm::Value*, clang::CodeGen::ReturnValueSlot, llvm::Value*, llvm::Value*, clang::ConstExprIterator, clang::ConstExprIterator) + 564
> 14 clang           0x00000000007c472d clang::CodeGen::CodeGenFunction::EmitCXXMemberCallExpr(clang::CXXMemberCallExpr const*, clang::CodeGen::ReturnValueSlot) + 1053
> 15 clang           0x00000000007b258e clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) + 398
> 16 clang           0x00000000007b271e clang::CodeGen::CodeGenFunction::EmitCallExprLValue(clang::CallExpr const*) + 46
> 17 clang           0x00000000007b83a6 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*) + 1750
> 18 clang           0x00000000007bd275
> 19 clang           0x00000000007bd672 clang::CodeGen::CodeGenFunction::EmitReferenceBindingToExpr(clang::Expr const*, clang::NamedDecl const*) + 50
> 20 clang           0x000000000082c6ae clang::CodeGen::CodeGenFunction::EmitReturnStmt(clang::ReturnStmt const&) + 542
> 21 clang           0x000000000082ce3c clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*) + 876
> 22 clang           0x000000000082f8ff clang::CodeGen::CodeGenFunction::EmitCompoundStmt(clang::CompoundStmt const&, bool, llvm::Value*, bool) + 239
> 23 clang           0x000000000082fbbc clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*) + 236
> 24 clang           0x000000000082caec clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*) + 28
> 25 clang           0x000000000084f2cb clang::CodeGen::CodeGenFunction::GenerateCode(clang::CodeGen::GlobalDecl, llvm::Function*) + 875
> 26 clang           0x00000000007534aa clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::CodeGen::GlobalDecl) + 522
> 27 clang           0x0000000000756c32 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::CodeGen::GlobalDecl) + 194
> 28 clang           0x0000000000757527 clang::CodeGen::CodeGenModule::EmitDeferred() + 151
> 29 clang           0x00000000007575a9 clang::CodeGen::CodeGenModule::Release() + 9
> 30 clang           0x000000000074a838
> 31 clang           0x0000000000867ecd clang::ParseAST(clang::Sema&, bool) + 301
> 32 clang           0x000000000074b7c4 clang::CodeGenAction::ExecuteAction() + 68
> 33 clang           0x000000000063c33d clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 349
> 34 clang           0x000000000064e39c clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1324
> 35 clang           0x0000000000631493 cc1_main(char const**, char const**, char const*, void*) + 611
> 36 clang           0x0000000000637efb main + 4011
> 37 libc.so.6       0x00002b9160f97c4d __libc_start_main + 253
> 38 clang           0x000000000062fc59
> Stack dump:
> 0.	Program arguments: /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.install.1/bin/clang -cc1 -triple x86_64-pc-linux-gnu -S -disable-free -main-file-name LLVMCConfigurationEmitter.cpp -pic-level 2 -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version 2.20.1 -resource-dir /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.install.1/lib/clang/2.8 -dependency-file /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.obj.2/utils/TableGen/Release+Asserts/LLVMCConfigurationEmitter.d.tmp -MP -MT /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.obj.2/utils/TableGen/Release+Asserts/LLVMCConfigurationEmitter.o -MT /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.obj.2/utils/TableGen/Release+Asserts/LLVMCConfigurationEmitter.d -D _DEBUG -D _GNU_SOURCE -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -I /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.obj.2/include -I /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.obj.2/utils/TableGen -I /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.src/include -I /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.src/utils/TableGen -O3 -Woverloaded-virtual -Wcast-qual -Wno-long-long -Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -ferror-limit 19 -fmessage-length 0 -fexceptions -fgnu-runtime -fdiagnostics-show-option -o /tmp/cc-Sx141Z.s -x c++ /build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.src/utils/TableGen/LLVMCConfigurationEmitter.cpp 
> 1.	<eof> parser at end of file
> 2.	Per-file LLVM IR generation
> 3.	/build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.src/include/llvm/ADT/StringMap.h:388:28: Generating code for declaration 'llvm::StringMap<void (<anonymous>::EmitPreprocessOptionsCallback::*)(llvm::DagInit const &, unsigned int, llvm::raw_ostream &) const, llvm::MallocAllocator>::GetOrCreateValue'
> 4.	/build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.src/include/llvm/ADT/StringMap.h:388:60: LLVM IR generation of compound statement ('{}')
> clang: error: clang frontend command failed due to signal 6 (use -v to see invocation)
> make[3]: *** [/build/buildbot-llvm/clang-x86_64-linux-selfhost-rel/llvm.obj.2/utils/TableGen/Release+Asserts/
Actually, this is just a leftover assertion. Fixed in r111782.

	- Doug

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