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stage2: make tests/behaviour/void.zig work with c backend

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* fix initialisation of void* fields of structs (initialises to 0xaa.. rather than {})
* don't generate struct fields when the field type does not have codegen bits
* in airAlloc generate a void* literal if the element type does not have codegen bits
This commit is contained in:
Matthew Hall 2021-12-23 18:40:27 +00:00 committed by Andrew Kelley
parent 17046674a7
commit 4266795743
2 changed files with 18 additions and 3 deletions
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19
src/codegen/c.zig
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@ -302,7 +302,11 @@ pub const DeclGen = struct {
else => return dg.fail("TODO float types > 64 bits are not support in renderValue() as of now", .{}),
}
},
.Pointer => switch (dg.module.getTarget().cpu.arch.ptrBitWidth()) {
32 => return writer.writeAll("(void *)0xaaaaaaaa"),
64 => return writer.writeAll("(void *)0xaaaaaaaaaaaaaaaa"),
else => unreachable,
},
else => {
// This should lower to 0xaa bytes in safe modes, and for unsafe modes should
// lower to leaving variables uninitialized (that might need to be implemented
@ -685,6 +689,7 @@ pub const DeclGen = struct {
var it = struct_obj.fields.iterator();
while (it.next()) |entry| {
const field_ty = entry.value_ptr.ty;
if (!field_ty.hasCodeGenBits()) continue;
const name: CValue = .{ .bytes = entry.key_ptr.* };
try buffer.append(' ');
try dg.renderTypeAndName(buffer.writer(), field_ty, name, .Mut);
@ -1400,9 +1405,19 @@ fn airAlloc(f: *Function, inst: Air.Inst.Index) !CValue {
const writer = f.object.writer();
const inst_ty = f.air.typeOfIndex(inst);
// First line: the variable used as data storage.
const elem_type = inst_ty.elemType();
const mutability: Mutability = if (inst_ty.isConstPtr()) .Const else .Mut;
if (!elem_type.hasCodeGenBits()) {
const target = f.object.dg.module.getTarget();
const literal = switch (target.cpu.arch.ptrBitWidth()) {
32 => "(void *)0xaaaaaaaa",
64 => "(void *)0xaaaaaaaaaaaaaaaa",
else => unreachable,
};
return CValue{ .bytes = literal };
}
// First line: the variable used as data storage.
const local = try f.allocLocal(elem_type, mutability);
try writer.writeAll(";\n");

2
test/behavior.zig
View File

@ -55,6 +55,7 @@ test {
_ = @import("behavior/translate_c_macros.zig");
_ = @import("behavior/underscore.zig");
_ = @import("behavior/while.zig");
_ = @import("behavior/void.zig");
if (builtin.object_format != .c) {
// Tests that pass for stage1 and stage2 but not the C backend and wasm backend.
@ -94,7 +95,6 @@ test {
_ = @import("behavior/switch.zig");
_ = @import("behavior/undefined.zig");
_ = @import("behavior/union.zig");
_ = @import("behavior/void.zig");
_ = @import("behavior/widening.zig");
if (builtin.zig_is_stage2) {