Crash in MSP430 DAG->DAG Should only be an extending load, not truncating!

[dmikushin]

void *alloca(unsigned int size);

short foo(char** data, char encoding)
{
	char* encoding_addr = alloca(sizeof(char));
	*encoding_addr = encoding;

	char tmp3 = *encoding_addr;
	short conv2 = tmp3;
	short and = conv2 & 0xf;

	switch (and)
	{
	case 0 :
	case 4 :
	case 10 :
		return 1;
	case 11 :
		return 2;
	}
}

$ clang -cc1 msp430-reloc.c -S -o -
msp430-reloc.c:25:1: warning: control may reach end of non-void function
}
^
.text
.file "msp430-reloc.c"
clang: /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:6425: llvm::SDValue llvm::SelectionDAG::getLoad(llvm::ISD::MemIndexedMode, llvm::ISD::LoadExtType, llvm::EVT, const llvm::SDLoc&, llvm::SDValue, llvm::SDValue, llvm::SDValue, llvm::EVT, llvm::MachineMemOperand*): Assertion `MemVT.getScalarType().bitsLT(VT.getScalarType()) && "Should only be an extending load, not truncating!"' failed.
Stack dump:
0. Program arguments: clang -cc1 -emit-llvm msp430-reloc.c -S -o -

1. parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'msp430-reloc.c'.
4. Running pass 'MSP430 DAG->DAG Pattern Instruction Selection' on function '@foo'
   LLVMSymbolizer: error reading file: No such file or directory
   #0 0x00007fb9e8f5a2d3 llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/Support/Unix/Signals.inc:495:0
   Add MC layer #1 0x00007fb9e8f5a366 PrintStackTraceSignalHandler(void*) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/Support/Unix/Signals.inc:559:0
   [MSP430] Improve support for 'interrupt' attribute #2 0x00007fb9e8f5808c llvm::sys::RunSignalHandlers() /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/Support/Signals.cpp:67:0
   SelectionDAG fails on assertion #3 0x00007fb9e8f59cf5 SignalHandler(int) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/Support/Unix/Signals.inc:358:0
   Use rrcl node instead of clrc+rrc #4 0x00007fb9e50d5f20 (/lib/x86_64-linux-gnu/libc.so.6+0x3ef20)
   Add MSP430 toolchain #5 0x00007fb9e50d5e97 gsignal /build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
   LLD fails on TI provided ld scripts #6 0x00007fb9e50d7801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
   [MCLayer] Add remaining instruction forms #7 0x00007fb9e50c739a __assert_fail_base /build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
   [WIP] Fixes for LLD #8 0x00007fb9e50c7412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
   Impossible reg-to-reg copy #9 0x00007fb9e44c39d5 llvm::SelectionDAG::getLoad(llvm::ISD::MemIndexedMode, llvm::ISD::LoadExtType, llvm::EVT, llvm::SDLoc const&, llvm::SDValue, llvm::SDValue, llvm::SDValue, llvm::EVT, llvm::MachineMemOperand*) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:6424:0
   Error in backend: Cannot select RRCL #10 0x00007fb9e44c387f llvm::SelectionDAG::getLoad(llvm::ISD::MemIndexedMode, llvm::ISD::LoadExtType, llvm::EVT, llvm::SDLoc const&, llvm::SDValue, llvm::SDValue, llvm::SDValue, llvm::MachinePointerInfo, llvm::EVT, unsigned int, llvm::MachineMemOperand::Flags, llvm::AAMDNodes const&, llvm::MDNode const*) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:6411:0
   Enable newlib building #11 0x00007fb9e44c41ea llvm::SelectionDAG::getExtLoad(llvm::ISD::LoadExtType, llvm::SDLoc const&, llvm::EVT, llvm::SDValue, llvm::SDValue, llvm::MachinePointerInfo, llvm::EVT, unsigned int, llvm::MachineMemOperand::Flags, llvm::AAMDNodes const&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:6488:0
   Enable RIOT building #12 0x00007fb9e43655fb (anonymous namespace)::SelectionDAGLegalize::ExpandNode(llvm::SDNode*) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:3496:0
   Fix writeback register size for 8rp i-forms #13 0x00007fb9e4351717 (anonymous namespace)::SelectionDAGLegalize::LegalizeOp(llvm::SDNode*) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1226:0
   Add rrcl8 pseudo #14 0x00007fb9e436d9d0 llvm::SelectionDAG::Legalize() /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:4599:0
   Add __builtin_flt_rounds #15 0x00007fb9e44fe0c0 llvm::SelectionDAGISel::CodeGenAndEmitDAG() /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:863:0
   Prologue/epilogue optimization #16 0x00007fb9e4504667 llvm::SelectionDAGISel::FinishBasicBlock() /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:2082:0
   Disassembler failure #17 0x00007fb9e4503048 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1796:0
   EABI requires to pass structurs larger than 32 bits by reference #18 0x00007fb9e44fb738 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:472:0
   Fix disassembler; add bit[rm]c instructions #19 0x00007fb9ecf49715 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/CodeGen/MachineFunctionPass.cpp:74:0
   Omit frame pointer by default #20 0x00007fb9ec20feb4 llvm::FPPassManager::runOnFunction(llvm::Function&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/IR/LegacyPassManager.cpp:1644:0
   Inline asm register names #21 0x00007fb9ec21012b llvm::FPPassManager::runOnModule(llvm::Module&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/IR/LegacyPassManager.cpp:1679:0
   [RIOT] Non-asm stmt in naked function #22 0x00007fb9ec21052c (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/IR/LegacyPassManager.cpp:1744:0
   Relocation Types defined by EABI are different from clang supported #23 0x00007fb9ec210d4f llvm::legacy::PassManagerImpl::run(llvm::Module&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/IR/LegacyPassManager.cpp:1857:0
   Aligment for i32, i64, f32, f64 is more than EABI states #24 0x00007fb9ec210f7f llvm::legacy::PassManager::run(llvm::Module&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/lib/IR/LegacyPassManager.cpp:1889:0
   [MSP430] Add more tests for calling convention and ABI #25 0x00007fb9e69b6774 (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_deletellvm::raw_pwrite_stream >) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/CodeGen/BackendUtil.cpp:871:0
   [MSP430] Fix i64, f32 and f64 alignment #26 0x00007fb9e69b9af8 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_deletellvm::raw_pwrite_stream >) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/CodeGen/BackendUtil.cpp:1300:0
   Possible optimization for unaligned load/store #27 0x00007fb9e6df3b01 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/CodeGen/CodeGenAction.cpp:293:0
   [#18] Align byval lowering with MSP430 EABI #28 0x00007fb9ded801e6 clang::ParseAST(clang::Sema&, bool, bool) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/Parse/ParseAST.cpp:177:0
   .refsym directive is not supported #29 0x00007fb9e5e03fc7 clang::ASTFrontendAction::ExecuteAction() /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/Frontend/FrontendAction.cpp:1018:0
   @Rn is not supported as destination #30 0x00007fb9e6df04b8 clang::CodeGenAction::ExecuteAction() /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/CodeGen/CodeGenAction.cpp:1045:0
   .weak directive is ignored #31 0x00007fb9e5e039b8 clang::FrontendAction::Execute() /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/Frontend/FrontendAction.cpp:921:0
   lld produces broken elf #32 0x00007fb9e5d79600 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/Frontend/CompilerInstance.cpp:969:0
   [MSP430] Emulate [at]rd in destination position as 0(rd) #33 0x00007fb9e586080e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /home/marcusmae/acctek/msp430-clang-newlib/msp430-clang/src/llvm/tools/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:267:0
   [MSP430] Add support for .refsym directive #34 0x0000562603396d60 (clang+0x4ad60)
   undefined symbol: __lshrsi3 #35 0x000056260338bf93 (clang+0x3ff93)
   Wrong relocation type #36 0x000056260338cc75 (clang+0x40c75)
   lld is not able to link with libgcc (relaxation is not supported) #37 0x00007fb9e50b8b97 __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
   [MSP430] Add RTLIB::[SRL/SRA/SHL]_I32 lowering to EABI lib calls #38 0x000056260338997a (clang+0x3d97a)
   Aborted (core dumped)

[chbessonova]

It has the same root cause as #72.
Without driver (in the case when cc1 running) frontend assumes RelocationModel = PIC by default.

[dmikushin]

The problem is I'm getting this even with PIE/PIC disabling patch.

…

On Sat, Jan 26, 2019, 11:05 chbessonova ***@***.*** wrote: It has the same root cause as #72 <#72>. Without driver (in the case when cc1 running) frontend assumes RelocationModel = PIC by default. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#86 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AFaPqrVHIz79hP2vZfpsXYZFsqORBXhCks5vHAxYgaJpZM4aP4em> .

[chbessonova]

@dmikushin The patch disables PIC/PIE in the driver. The driver doesn't start when cc1 is calling, so, driver configuration has no effect.
clang msp430-reloc.c -S -o - (cc1 is removed from command line) should finish successfully.
I didn't find how to force RelocationModel = Static in the frontend, so it seems we should manually specify -mrelocation-model=static calling cc1, but may be @asl can suggest some better solution.

[dmikushin]

Thanks, makes a lot of sense, as now I see the PIC/PIE patch must be revised to cover this case as well. сб, 26 янв. 2019 г. в 15:48, chbessonova <notifications@github.com>:

…

@dmikushin <https://github.com/dmikushin> The patch disables PIC/PIE in the driver. The driver doesn't start when cc1 is calling, so, driver configuration has no effect. clang msp430-reloc.c -S -o - (cc1 is removed from command line) should finish successfully. I didn't find how to force RelocationModel = Static in the frontend, so it seems we should manually specify -mrelocation-model=static calling cc1, but may be @asl <https://github.com/asl> can suggest some better solution. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#86 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AFaPqvphnwkjviWieU4jI7vxNJWaWsQzks5vHE6kgaJpZM4aP4em> .