Merge pull request #11167 from mitchellh/codegen-arrays

stage2: codegen of arrays should use type length, not value length

src/codegen.zig

@@ -207,29 +207,18 @@ pub fn generateSymbol(
             .bytes => {
                 // TODO populate .debug_info for the array
                 const payload = typed_value.val.castTag(.bytes).?;
-                if (typed_value.ty.sentinel()) |sentinel| {
-                    try code.ensureUnusedCapacity(payload.data.len + 1);
-                    code.appendSliceAssumeCapacity(payload.data);
-                    switch (try generateSymbol(bin_file, src_loc, .{
-                        .ty = typed_value.ty.elemType(),
-                        .val = sentinel,
-                    }, code, debug_output, reloc_info)) {
-                        .appended => return Result{ .appended = {} },
-                        .externally_managed => |slice| {
-                            code.appendSliceAssumeCapacity(slice);
+                const len = @intCast(usize, typed_value.ty.arrayLenIncludingSentinel());
+                // The bytes payload already includes the sentinel, if any
+                try code.ensureUnusedCapacity(len);
+                code.appendSliceAssumeCapacity(payload.data[0..len]);
                 return Result{ .appended = {} };
             },
-                        .fail => |em| return Result{ .fail = em },
-                    }
-                } else {
-                    return Result{ .externally_managed = payload.data };
-                }
-            },
             .aggregate => {
                 // TODO populate .debug_info for the array
                 const elem_vals = typed_value.val.castTag(.aggregate).?.data;
                 const elem_ty = typed_value.ty.elemType();
-                for (elem_vals) |elem_val| {
+                const len = @intCast(usize, typed_value.ty.arrayLenIncludingSentinel());
+                for (elem_vals[0..len]) |elem_val| {
                     switch (try generateSymbol(bin_file, src_loc, .{
                         .ty = elem_ty,
                         .val = elem_val,

src/codegen/llvm.zig

@@ -1550,7 +1550,7 @@ pub const DeclGen = struct {
                     const bytes = tv.val.castTag(.bytes).?.data;
                     return dg.context.constString(
                         bytes.ptr,
-                        @intCast(c_uint, bytes.len),
+                        @intCast(c_uint, tv.ty.arrayLenIncludingSentinel()),
                         .True, // don't null terminate. bytes has the sentinel, if any.
                     );
                 },
@@ -1558,10 +1558,11 @@ pub const DeclGen = struct {
                     const elem_vals = tv.val.castTag(.aggregate).?.data;
                     const elem_ty = tv.ty.elemType();
                     const gpa = dg.gpa;
-                    const llvm_elems = try gpa.alloc(*const llvm.Value, elem_vals.len);
+                    const len = @intCast(usize, tv.ty.arrayLenIncludingSentinel());
+                    const llvm_elems = try gpa.alloc(*const llvm.Value, len);
                     defer gpa.free(llvm_elems);
                     var need_unnamed = false;
-                    for (elem_vals) |elem_val, i| {
+                    for (elem_vals[0..len]) |elem_val, i| {
                         llvm_elems[i] = try dg.genTypedValue(.{ .ty = elem_ty, .val = elem_val });
                         need_unnamed = need_unnamed or dg.isUnnamedType(elem_ty, llvm_elems[i]);
                     }

test/behavior.zig

@@ -62,6 +62,7 @@ test {
     _ = @import("behavior/bugs/11100.zig");
     _ = @import("behavior/bugs/10970.zig");
     _ = @import("behavior/bugs/11046.zig");
+    _ = @import("behavior/bugs/11165.zig");
     _ = @import("behavior/call.zig");
     _ = @import("behavior/cast.zig");
     _ = @import("behavior/comptime_memory.zig");

test/behavior/bugs/11165.zig

@@ -0,0 +1,48 @@
+const builtin = @import("builtin");
+
+test "bytes" {
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        a: u32,
+        c: [5]u8,
+    };
+
+    const U = union {
+        s: S,
+    };
+
+    const s_1 = S{
+        .a = undefined,
+        .c = "12345".*, // this caused problems
+    };
+    _ = s_1;
+
+    var u_2 = U{ .s = s_1 };
+    _ = u_2;
+}
+
+test "aggregate" {
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        a: u32,
+        c: [5]u8,
+    };
+
+    const U = union {
+        s: S,
+    };
+
+    const c = [5:0]u8{ 1, 2, 3, 4, 5 };
+    const s_1 = S{
+        .a = undefined,
+        .c = c, // this caused problems
+    };
+    _ = s_1;
+
+    var u_2 = U{ .s = s_1 };
+    _ = u_2;
+}