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Fix LLVM codegen for matching on nil for union{}

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bingis-khan
2026-07-26 11:11:36 +02:00
parent e1691f9fac
commit c1e327c566
1 changed files with 3 additions and 1 deletions
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4
src/llvm_backend_stmt.cpp
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@@ -2201,7 +2201,9 @@ gb_internal void lb_build_type_switch_stmt(lbProcedure *p, AstTypeSwitchStmt *ss
LLVMValueRef switch_instr = nullptr;
if (type_size_of(parent_base_type) == 0) {
GB_ASSERT(tag.value == nullptr);
switch_instr = LLVMBuildSwitch(p->builder, lb_const_bool(p->module, t_llvm_bool, false).value, else_block->block, cast(unsigned)num_cases);
GB_ASSERT(switch_kind == TypeSwitch_Union); // zero size only possible for union{}
Type *ut = type_deref(parent.type);
switch_instr = LLVMBuildSwitch(p->builder, lb_const_int(m, union_tag_type(ut), 0).value, else_block->block, cast(unsigned)num_cases);
} else {
GB_ASSERT(tag.value != nullptr);
switch_instr = LLVMBuildSwitch(p->builder, tag.value, else_block->block, cast(unsigned)num_cases);