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| author | Tom Tromey <tromey@adacore.com> | 2023-01-11 12:42:40 -0700 |
|---|---|---|
| committer | Tom Tromey <tromey@adacore.com> | 2023-02-09 07:55:34 -0700 |
| commit | 1775f8b3804744c22611ed0c9fd2df4f5b4d8641 (patch) | |
| tree | 06c240bfc9fe68afe224cfc4e9bddc3e09e7850b /gdb/compile | |
| parent | 119f6cfbd0236c9684a8a12ff9241dc834418309 (diff) | |
| download | gdb-1775f8b3804744c22611ed0c9fd2df4f5b4d8641.zip gdb-1775f8b3804744c22611ed0c9fd2df4f5b4d8641.tar.gz gdb-1775f8b3804744c22611ed0c9fd2df4f5b4d8641.tar.bz2 | |
Increase size of main_type::nfields
main_type::nfields is a 'short', and has been for many years. PR
c++/29985 points out that 'short' is too narrow for an enum that
contains more than 2^15 constants.
This patch bumps the size of 'nfields'. To verify that the field
isn't directly used, it is also renamed. Note that this does not
affect the size of main_type on x86-64 Fedora 36. And, if it does
have a negative effect somewhere, it's worth considering that types
could be shrunk more drastically by using subclasses for the different
codes.
This is v2 of this patch, which has these changes:
* I changed nfields to 'unsigned', per Simon's request. I looked at
changing all the uses, but this quickly fans out into a very large
patch. (One additional tweak was needed, though.)
* I wrote a test case. I discovered that GCC cannot compile a large
enough C test case, so I resorted to using the DWARF assembler.
This test doesn't reproduce the crash, but it does fail without the
patch.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29985
Diffstat (limited to 'gdb/compile')
| -rw-r--r-- | gdb/compile/compile-cplus-types.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gdb/compile/compile-cplus-types.c b/gdb/compile/compile-cplus-types.c index 5566115..d48aa61 100644 --- a/gdb/compile/compile-cplus-types.c +++ b/gdb/compile/compile-cplus-types.c @@ -981,7 +981,7 @@ compile_cplus_convert_func (compile_cplus_instance *instance, gcc_type return_type = instance->convert_type (target_type); std::vector<gcc_type> elements (type->num_fields ()); - struct gcc_type_array array = { type->num_fields (), elements.data () }; + struct gcc_type_array array = { (int) type->num_fields (), elements.data () }; int artificials = 0; for (int i = 0; i < type->num_fields (); ++i) { |