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Fix edge case in switch with single else

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ir_gen_switch_expr doesn't set the switch_br field at all if there are
zero cases, detect this situation and handle it gracefully.

Closes #4322
This commit is contained in:
LemonBoy
2020-01-29 19:08:15 +01:00
committed by Andrew Kelley
parent 4fad16284e
commit 59bc1d2721
2 changed files with 17 additions and 1 deletions
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4
src/ir.cpp
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@@ -22768,7 +22768,9 @@ static IrInstGen *ir_analyze_instruction_switch_else_var(IrAnalyze *ira,
}
// Make note of the errors handled by other cases
ErrorTableEntry **errors = allocate<ErrorTableEntry *>(ira->codegen->errors_by_index.length);
for (size_t case_i = 0; case_i < instruction->switch_br->case_count; case_i += 1) {
// We may not have any case in the switch if this is a lone else
const size_t switch_cases = instruction->switch_br ? instruction->switch_br->case_count : 0;
for (size_t case_i = 0; case_i < switch_cases; case_i += 1) {
IrInstSrcSwitchBrCase *br_case = &instruction->switch_br->cases[case_i];
IrInstGen *case_expr = br_case->value->child;
if (case_expr->value->type->id == ZigTypeIdErrorSet) {