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terralang / terra

Terra is a low-level system programming language that is embedded in and meta-programmed by the Lua programming language.
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constantinits.t breaks on LLVM 17 Linux #644

Closed elliottslaughter closed 1 month ago

elliottslaughter commented 10 months ago

Documenting the test failure so I can move on with the PR.

Failure looks like:

$ ../build/bin/terra constantinits.t
../build/bin/terra(_ZNK4llvm10BasicBlock20getSinglePredecessorEv+0xd) [0x55be0e987add]
Segmentation fault

Backtrace:

(gdb) bt
#0  0x0000555556964add in llvm::BasicBlock::getSinglePredecessor() const ()
#1  0x0000555557ca638d in (anonymous namespace)::EarlyCSE::run() ()
#2  0x0000555557ca91f3 in llvm::EarlyCSEPass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) ()
#3  0x00005555565b5f41 in llvm::detail::PassModel<llvm::Function, llvm::EarlyCSEPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (this=0x555561725dc0, IR=..., AM=...)
    at /home/eslaught/sw/llvm-17/install/include/llvm/IR/PassManagerInternal.h:89
#4  0x0000555556af08d9 in llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) ()
#5  0x00005555565601a1 in FunctionEmitter::emitConstantExpression (this=0x7fffffffd650, exp=0x7fffffffd7c0)
    at /scratch/eslaught/terra/src/tcompiler.cpp:1979
#6  0x0000555556548112 in EmitConstantInitializer (CU=0x55556171f920, v=0x7fffffffd7c0) at /scratch/eslaught/terra/src/tcompiler.cpp:3554
#7  0x00005555565453d9 in CreateGlobalVariable (CU=0x55556171f920, global=0x7fffffffd900, name=0x7ffff79f4bc0 "<constant>")
    at /scratch/eslaught/terra/src/tcompiler.cpp:1614
#8  0x0000555556545757 in EmitGlobalVariable (CU=0x55556171f920, global=0x7fffffffd900, name=0x7ffff79f4bc0 "<constant>")
    at /scratch/eslaught/terra/src/tcompiler.cpp:1647
#9  0x000055555654852a in terra_compilationunitaddvalue (L=0x7ffff7a22380) at /scratch/eslaught/terra/src/tcompiler.cpp:3595
#10 0x000055555cbeed16 in lj_BC_FUNCC ()
#11 0x000055555cb9fadf in lua_pcall (L=<optimized out>, nargs=<optimized out>, nresults=<optimized out>, errfunc=<optimized out>)
    at lj_api.c:1116
#12 0x0000555556541746 in docall (L=0x7ffff7a22380, narg=0, clear=0) at /scratch/eslaught/terra/src/main.cpp:339
#13 0x0000555556540d4f in main (argc=2, argv=0x7fffffffdbd8) at /scratch/eslaught/terra/src/main.cpp:119
elliottslaughter commented 9 months ago

Still present in LLVM 17.0.5.

elliottslaughter commented 6 months ago

Looks like it also sometimes fails on macOS: https://github.com/terralang/terra/actions/runs/7763315635/job/21175891217