From 9d084466d740e40c655609f9c04b3bb2b9b9ca76 Mon Sep 17 00:00:00 2001 From: Tankut Baris Aktemur Date: Fri, 20 Dec 2019 17:43:06 +0100 Subject: infcall, c++: allow more info to be computed for pass-by-reference values In C++, call-by-value arguments that cannot be trivially copied are implicitly passed by reference. When making an infcall, GDB needs to find out if an argument is pass-by-reference or not, so that the correct semantics can be followed. This patch enriches the information computed by the language ops for pass-by-reference arguments. Instead of a plain binary result, the computed information now includes whether the argument is - copy constructible - destructible - trivially copyable - trivially copy constructible - trivially destructible This information is stored in a struct named 'language_pass_by_ref_info'. This patch paves the way for GDB's infcall mechanism to call the copy ctor and the destructor of a pass-by-ref argument appropriately. gdb/ChangeLog: 2019-12-20 Tankut Baris Aktemur * language.h (struct language_pass_by_ref_info): New struct. (struct language_defn): Change the signature to return a language_pass_by_ref_info instead of an int. (language_pass_by_reference): Ditto. (default_pass_by_reference): Ditto. Adjust the users listed below. * arch-utils.c (default_return_in_first_hidden_param_p): Update. * cp-abi.c (cp_pass_by_reference): Update. * cp-abi.h (cp_pass_by_reference): Update declaration. (struct cp_abi_ops): Update. * gnu-v3-abi.c (gnuv3_pass_by_reference): Update. * infcall.c (call_function_by_hand_dummy): Update. * language.c (language_pass_by_reference): Update. (default_pass_by_reference): Update. * tic6x-tdep.c (tic6x_return_value): Update. Change-Id: Ib1c1f87f2490a5737c469f7b7185ddc7f6a164cb --- gdb/tic6x-tdep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'gdb/tic6x-tdep.c') diff --git a/gdb/tic6x-tdep.c b/gdb/tic6x-tdep.c index 2df83c4..ca059f9 100644 --- a/gdb/tic6x-tdep.c +++ b/gdb/tic6x-tdep.c @@ -784,7 +784,7 @@ tic6x_return_value (struct gdbarch *gdbarch, struct value *function, if (type != NULL) { type = check_typedef (type); - if (language_pass_by_reference (type)) + if (!(language_pass_by_reference (type).trivially_copyable)) return RETURN_VALUE_STRUCT_CONVENTION; } } -- cgit v1.1