Compiler crash?

[jordan4ibanez]

Here is the sample code:

struct Vec3i {
    int x = 0;
    int y = 0;
    int z = 0;
}

private static void[0][Vec3i] wideBandPoints;

void blah() {
    Vec3i cache;
    wideBandPoints[cache] = null;
}

Here is the output:

 #0 0x0000582596ef90e7 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x71ea0e7)
 #1 0x0000582596ef6eec llvm::sys::RunSignalHandlers() ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x71e7eec)
 #2 0x0000582596ef978f SignalHandler(int) Signals.cpp:0:0
 #3 0x00007929ba245330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
 #4 0x0000582593791cc2 _D3dmd5dcast14implicitConvToFCQBc5mtype4TypeQpZEQBu8astenums5MATCH ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a82cc2)
 #5 0x00005825939e201d ExpressionSemanticVisitor::visit(AssignExp*) ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3cd301d)
 #6 0x00005825937b2d78 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ8visitExpMFCQDuQCc12ExpStatementZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3aa3d78)
 #7 0x00005825937aed57 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9fd57)
 #8 0x00005825937af17c _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3aa017c)
 #9 0x00005825937abb72 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ7visitIfMFCQDtQCb11IfStatementZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9cb72)
#10 0x00005825937aed57 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9fd57)
#11 0x00005825937af17c _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3aa017c)
#12 0x00005825937addd4 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ8visitForMFCQDuQCc12ForStatementZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9edd4)
#13 0x00005825937aed57 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9fd57)
#14 0x00005825937af17c _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3aa017c)
#15 0x00005825937adfb3 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ8visitForMFCQDuQCc12ForStatementZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9efb3)
#16 0x00005825937aed57 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9fd57)
#17 0x00005825937af17c _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3aa017c)
#18 0x00005825937addd4 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ8visitForMFCQDuQCc12ForStatementZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9edd4)
#19 0x0000582593978e07 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ10visitWhileMFCQDxQCf14WhileStatementZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3c69e07)
#20 0x00005825937aed57 _D3dmd12statementsem22statementSemanticVisitFCQBs9statement9StatementPSQCr6dscope5ScopeZ5visit14VisitStatementMFQCpZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3a9fd57)
#21 0x00005825938f29c9 Semantic3Visitor::visit(FuncDeclaration*) ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3be39c9)
#22 0x00005825938f01c5 SemanticTimeTraceVisitor<Semantic3Visitor*>::visit(FuncDeclaration*) ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3be11c5)
#23 0x0000582593838c6c Semantic3Visitor::visit(Module*) ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3b29c6c)
#24 0x000058259385f221 SemanticTimeTraceVisitor<Semantic3Visitor*>::visit(Module*) ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3b50221)
#25 0x0000582593a336cb mars_tryMain(Param&, Array<char const*>&) ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3d246cb)
#26 0x0000582593a80bc0 cppmain() ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3d71bc0)
#27 0x0000582597424aed _D2rt6dmain212_d_run_main2UAAamPUQgZiZ6runAllMFZv ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x7715aed)
#28 0x00005825974248c4 _d_run_main2 ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x77158c4)
#29 0x00005825974246dd _d_run_main ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x77156dd)
#30 0x0000582597264fc8 main ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x7555fc8)
#31 0x00007929ba22a1ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#32 0x00007929ba22a28b call_init ./csu/../csu/libc-start.c:128:20
#33 0x00007929ba22a28b __libc_start_main ./csu/../csu/libc-start.c:347:5
#34 0x0000582593a8578e _start ($HOME/dlang/ldc-1.40.0/bin/ldc2+0x3d7678e)

[thewilsonator]

This looks like a DMD failure, not specific to LDC. What (DMD frontend) version of LDC are you using? Does the crash also occur with DMD for the same version?

[jordan4ibanez]

I am using

LDC - the LLVM D compiler (1.40.0):
  based on DMD v2.110.0 and LLVM 19.1.3
  built with LDC - the LLVM D compiler (1.40.0)
  Default target: x86_64-unknown-linux-gnu
  Host CPU: znver5
  http://dlang.org - http://wiki.dlang.org/LDC

[thewilsonator]

and does it fail with DMD v2.110.0?

[kinke]

There is no v2.110.0 final yet, so we get more upstream issues filed here for LDC. The compiler crashes with dmd-nightly on run.dlang.io too. Apparently caused by = null; = void[0].init fixes it.

[This is the 2nd time I recently see a void[0] as AA value type - I guess someone posted this as uber-1337 trick, in the hopes of saving some memory compared to using a bool, the usual workaround for no unordered_set support in Phobos.]

[Clouud9]

I have a similar error as @jordan4ibanez, with the same frontend:

LDC - the LLVM D compiler (1.40.1):
  based on DMD v2.110.0 and LLVM 19.1.7
  built with LDC - the LLVM D compiler (1.40.1)
  Default target: x86_64-pc-windows-msvc
  Host CPU: alderlake
  http://dlang.org - http://wiki.dlang.org/LDC