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Payload-less tagged union initialisation cause segfault #1478

hcff opened this Issue Sep 5, 2018 · 0 comments


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hcff commented Sep 5, 2018

pub const Union = union(enum) {

pub fn main() void {
    const a = Union{ .A={} };
 $ gdb zig-linux-x86_64-0.2.0.master/zig
GNU gdb (GDB) Fedora 8.1.1-3.fc28
(gdb) run build-exe uniontest/uniontest2.zig 
Starting program: zig-linux-x86_64-0.2.0.master/zig build-exe uniontest/uniontest2.zig

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff63a6b20 in llvm::Value::getContext() const ()
(gdb) bt
#0  0x00007ffff63a6380 in llvm::Value::getContext() const ()
#1  0x00007ffff6341b86 in llvm::StoreInst::StoreInst(llvm::Value*, llvm::Value*, bool, unsigned int, llvm::AtomicOrdering, unsigned char, llvm::Instruction*)
#2  0x00007ffff6341c33 in llvm::StoreInst::StoreInst(llvm::Value*, llvm::Value*, bool, unsigned int, llvm::Instruction*) ()
#3  0x00007ffff62e0282 in LLVMBuildStore ()
#4  0x00007ffff3815b8c in gen_store_untyped(CodeGen*, LLVMOpaqueValue*, LLVMOpaqueValue*, unsigned int, bool) ()
#5  0x00007ffff3821ae6 in gen_assign_raw(CodeGen*, LLVMOpaqueValue*, TypeTableEntry*, LLVMOpaqueValue*) ()
#6  0x00007ffff3821eb1 in ir_render_decl_var(CodeGen*, IrExecutable*, IrInstructionDeclVar*) [clone .isra.147] ()
#7  0x00007ffff3826f8b in ir_render_instruction(CodeGen*, IrExecutable*, IrInstruction*) [clone .isra.181] ()
#8  0x00007ffff382bcb7 in codegen_build(CodeGen*) ()
#9  0x00007ffff376bb9b in main ()

Using Union(undefined) instead of Union{ .A={} } or turning the union(enum) into a enum also fix the segfault.

@andrewrk andrewrk added this to the 0.3.0 milestone Sep 5, 2018

@andrewrk andrewrk added the bug label Sep 5, 2018

@andrewrk andrewrk closed this in ffb3b15 Sep 5, 2018

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