69 lines
2.5 KiB
Diff
69 lines
2.5 KiB
Diff
From 1b1aae4d607d0c5d0f6e8005d6280a282413dad8 Mon Sep 17 00:00:00 2001
|
|
From: Jon Turney <jon.turney@dronecode.org.uk>
|
|
Date: Sun, 24 Jul 2016 18:18:10 +0100
|
|
Subject: [PATCH 4/6] 7.8-symtab-cygwin
|
|
|
|
See https://sourceware.org/ml/gdb-patches/2002-03/msg00557.html
|
|
---
|
|
gdb/symtab.c | 37 +++++++++++++++++++++++++++++++++++++
|
|
1 file changed, 37 insertions(+)
|
|
|
|
diff --git a/gdb/symtab.c b/gdb/symtab.c
|
|
index f2b1a14e006..fafe0b7dfc8 100644
|
|
--- a/gdb/symtab.c
|
|
+++ b/gdb/symtab.c
|
|
@@ -864,6 +864,10 @@ create_demangled_names_hash (struct objfile_per_bfd_storage *per_bfd)
|
|
free_demangled_name_entry, xcalloc, xfree));
|
|
}
|
|
|
|
+#ifdef __CYGWIN__
|
|
+#define LINKER_SYMBOLS_HAVE_WIN32_STDCALL_ARG_SIZES (1)
|
|
+#endif
|
|
+
|
|
/* See symtab.h */
|
|
|
|
gdb::unique_xmalloc_ptr<char>
|
|
@@ -873,6 +877,39 @@ symbol_find_demangled_name (struct general_symbol_info *gsymbol,
|
|
gdb::unique_xmalloc_ptr<char> demangled;
|
|
int i;
|
|
|
|
+ /* On Windows, some functions use the `stdcall' calling convention,
|
|
+ in which the callee is expected to pop the arguments off the
|
|
+ stack. Normally, the caller takes care of this, because only the
|
|
+ caller knows how many arguments it really passed. To avoid
|
|
+ confusion, the linker symbols for `stdcall' functions have names
|
|
+ with a suffix "@N" attached to them, where "N" is the number of
|
|
+ bytes they'll pop. That way, if a caller thinks some `stdcall'
|
|
+ function `foo' expects M argument bytes, but the definition of
|
|
+ `foo' expects N argument bytes, N != M, then the call will be a
|
|
+ reference to `foo@M', but the definition will have a linker
|
|
+ symbol `foo@N', and you'll get a link-time `symbol not found'
|
|
+ error, instead of a crash at run-time.
|
|
+
|
|
+ (Note how this fails to address calls through function pointers,
|
|
+ since the byte count isn't part of the function pointer's type.
|
|
+ Go, Microsoft!)
|
|
+
|
|
+ Whatever. But our demangler doesn't like that '@N' suffix, so we
|
|
+ need to strip it off. */
|
|
+ if (LINKER_SYMBOLS_HAVE_WIN32_STDCALL_ARG_SIZES)
|
|
+ {
|
|
+ char *arg_byte_suffix = strchr (mangled, '@');
|
|
+ if (arg_byte_suffix)
|
|
+ {
|
|
+ int prefix_len = arg_byte_suffix - mangled;
|
|
+ char *mangled_sans_suffix = (char *)(alloca (prefix_len + 1));
|
|
+ memcpy (mangled_sans_suffix, mangled, prefix_len);
|
|
+ mangled_sans_suffix[prefix_len] = '\0';
|
|
+
|
|
+ mangled = mangled_sans_suffix;
|
|
+ }
|
|
+ }
|
|
+
|
|
if (gsymbol->language () == language_unknown)
|
|
gsymbol->m_language = language_auto;
|
|
|
|
--
|
|
2.40.0.windows.1
|
|
|