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stage2: fix use-after-free in analyzeBlockBody

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Robin Voetter 2021-10-26 02:29:07 +02:00
parent 914993123c
commit f95ec229f8
1 changed files with 2 additions and 1 deletions
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src/Sema.zig
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@ -3035,10 +3035,11 @@ fn analyzeBlockBody(
// to emit a jump instruction to after the block when it encounters the break.
try parent_block.instructions.append(gpa, merges.block_inst);
const resolved_ty = try sema.resolvePeerTypes(parent_block, src, merges.results.items, .none);
const ty_inst = try sema.addType(resolved_ty);
try sema.air_extra.ensureUnusedCapacity(gpa, @typeInfo(Air.Block).Struct.fields.len +
child_block.instructions.items.len);
sema.air_instructions.items(.data)[merges.block_inst] = .{ .ty_pl = .{
.ty = try sema.addType(resolved_ty),
.ty = ty_inst,
.payload = sema.addExtraAssumeCapacity(Air.Block{
.body_len = @intCast(u32, child_block.instructions.items.len),
}),