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translate_c: fix typedeffed pointer subtraction

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Closes #14560.
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John Schmidt 2023-02-10 14:46:29 +01:00 committed by GitHub
parent d24ebf1d12
commit a5d25fabda
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2 changed files with 34 additions and 1 deletions
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3
src/translate_c.zig
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@ -1748,7 +1748,8 @@ fn transBinaryOperator(
const lhs_expr = stmt.getLHS();
const lhs_qt = getExprQualType(c, lhs_expr);
const lhs_qt_translated = try transQualType(c, scope, lhs_qt, lhs_expr.getBeginLoc());
const elem_type = lhs_qt_translated.castTag(.c_pointer).?.data.elem_type;
const c_pointer = getContainer(c, lhs_qt_translated).?;
const elem_type = c_pointer.castTag(.c_pointer).?.data.elem_type;
const sizeof = try Tag.sizeof.create(c.arena, elem_type);
const bitcast = try Tag.bit_cast.create(c.arena, .{ .lhs = ptrdiff_type, .rhs = infixOpNode });

32
test/translate_c.zig
View File

@ -3916,4 +3916,36 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
\\ }) != 0) {}
\\}
});
if (builtin.os.tag == .windows) {
cases.add("Pointer subtraction with typedef",
\\typedef char* S;
\\void foo() {
\\ S a, b;
\\ long long c = a - b;
\\}
, &[_][]const u8{
\\pub export fn foo() void {
\\ var a: S = undefined;
\\ var b: S = undefined;
\\ var c: c_longlong = @divExact(@bitCast(c_longlong, @ptrToInt(a) -% @ptrToInt(b)), @sizeOf(u8));
\\ _ = @TypeOf(c);
\\}
});
} else {
cases.add("Pointer subtraction with typedef",
\\typedef char* S;
\\void foo() {
\\ S a, b;
\\ long c = a - b;
\\}
, &[_][]const u8{
\\pub export fn foo() void {
\\ var a: S = undefined;
\\ var b: S = undefined;
\\ var c: c_long = @divExact(@bitCast(c_long, @ptrToInt(a) -% @ptrToInt(b)), @sizeOf(u8));
\\ _ = @TypeOf(c);
\\}
});
}
}