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gdb
avoid-manual-memory-management-in-go-lang.c.patch
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File avoid-manual-memory-management-in-go-lang.c.patch of Package gdb
From 4e0e7ff14ba271576232160bf337639662a2ea23 Mon Sep 17 00:00:00 2001 From: Tom Tromey <tom@tromey.com> Date: Thu, 16 Feb 2023 17:36:29 -0700 Subject: [PATCH 2/3] Avoid manual memory management in go-lang.c I noticed a couple of spots in go-lang.c that could be improved by using unique_ptr. Reviewed-By: Andrew Burgess <aburgess@redhat.com> --- gdb/dwarf2/read.c | 2 +- gdb/go-exp.c | 287 +++++++++++++++++++++++----------------------- gdb/go-exp.y | 8 +- gdb/go-lang.c | 40 +++---- gdb/go-lang.h | 11 +- 5 files changed, 173 insertions(+), 175 deletions(-) diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c index 8aa7f8c31e5..61f4bd75013 100644 --- a/gdb/dwarf2/read.c +++ b/gdb/dwarf2/read.c @@ -7890,7 +7890,7 @@ fixup_go_packaging (struct dwarf2_cu *cu) && sym->aclass () == LOC_BLOCK) { gdb::unique_xmalloc_ptr<char> this_package_name - (go_symbol_package_name (sym)); + = go_symbol_package_name (sym); if (this_package_name == NULL) continue; diff --git a/gdb/go-exp.y b/gdb/go-exp.y index cbaa79ee18c..542a06d06d6 100644 --- a/gdb/go-exp.y +++ b/gdb/go-exp.y @@ -1393,16 +1393,16 @@ classify_name (struct parser_state *par_state, const struct block *block) current package. */ { - char *current_package_name = go_block_package_name (block); + gdb::unique_xmalloc_ptr<char> current_package_name + = go_block_package_name (block); if (current_package_name != NULL) { struct stoken sval = - build_packaged_name (current_package_name, - strlen (current_package_name), + build_packaged_name (current_package_name.get (), + strlen (current_package_name.get ()), copy.c_str (), copy.size ()); - xfree (current_package_name); sym = lookup_symbol (sval.ptr, block, VAR_DOMAIN, &is_a_field_of_this); if (sym.symbol) diff --git a/gdb/go-lang.c b/gdb/go-lang.c index 7549f14dc63..f9176ace71d 100644 --- a/gdb/go-lang.c +++ b/gdb/go-lang.c @@ -163,11 +163,8 @@ unpack_package_and_object (char *buf, Space for the resulting strings is malloc'd in one buffer. PACKAGEP,OBJECTP,METHOD_TYPE* will (typically) point into this buffer. - [There are a few exceptions, but the caller is still responsible for - freeing the resulting pointer.] A pointer to this buffer is returned, or NULL if symbol isn't a mangled Go symbol. - The caller is responsible for freeing the result. *METHOD_TYPE_IS_POINTERP is set to a boolean indicating if the method type is a pointer. @@ -180,7 +177,7 @@ unpack_package_and_object (char *buf, If we ever need to unpack the method type, this routine should work for that too. */ -static char * +static gdb::unique_xmalloc_ptr<char> unpack_mangled_go_symbol (const char *mangled_name, const char **packagep, const char **objectp, @@ -209,9 +206,10 @@ unpack_mangled_go_symbol (const char *mangled_name, /* main.init is mangled specially. */ if (strcmp (mangled_name, "__go_init_main") == 0) { - char *package = xstrdup ("main"); + gdb::unique_xmalloc_ptr<char> package + = make_unique_xstrdup ("main"); - *packagep = package; + *packagep = package.get (); *objectp = "init"; return package; } @@ -219,9 +217,10 @@ unpack_mangled_go_symbol (const char *mangled_name, /* main.main is mangled specially (missing prefix). */ if (strcmp (mangled_name, "main.main") == 0) { - char *package = xstrdup ("main"); + gdb::unique_xmalloc_ptr<char> package + = make_unique_xstrdup ("main"); - *packagep = package; + *packagep = package.get (); *objectp = "main"; return package; } @@ -261,7 +260,8 @@ unpack_mangled_go_symbol (const char *mangled_name, /* At this point we've decided we have a mangled Go symbol. */ - buf = xstrdup (mangled_name); + gdb::unique_xmalloc_ptr<char> result = make_unique_xstrdup (mangled_name); + buf = result.get (); /* Search backwards looking for "N<digit(s)>". */ p = buf + len; @@ -317,7 +317,7 @@ unpack_mangled_go_symbol (const char *mangled_name, } unpack_package_and_object (buf, packagep, objectp); - return buf; + return result; } /* Implements the la_demangle language_defn routine for language Go. @@ -381,10 +381,9 @@ go_language::demangle_symbol (const char *mangled_name, int options) const return make_unique_xstrdup ((const char *) obstack_finish (&tempbuf)); } -/* Given a Go symbol, return its package or NULL if unknown. - Space for the result is malloc'd, caller must free. */ +/* See go-lang.h. */ -char * +gdb::unique_xmalloc_ptr<char> go_symbol_package_name (const struct symbol *sym) { const char *mangled_name = sym->linkage_name (); @@ -393,8 +392,7 @@ go_symbol_package_name (const struct symbol *sym) const char *method_type_package_name; const char *method_type_object_name; int method_type_is_pointer; - char *name_buf; - char *result; + gdb::unique_xmalloc_ptr<char> name_buf; gdb_assert (sym->language () == language_go); name_buf = unpack_mangled_go_symbol (mangled_name, @@ -405,15 +403,12 @@ go_symbol_package_name (const struct symbol *sym) /* Some Go symbols don't have mangled form we interpret (yet). */ if (name_buf == NULL) return NULL; - result = xstrdup (package_name); - xfree (name_buf); - return result; + return make_unique_xstrdup (package_name); } -/* Return the package that BLOCK is in, or NULL if there isn't one. - Space for the result is malloc'd, caller must free. */ +/* See go-lang.h. */ -char * +gdb::unique_xmalloc_ptr<char> go_block_package_name (const struct block *block) { while (block != NULL) @@ -422,7 +417,8 @@ go_block_package_name (const struct block *block) if (function != NULL) { - char *package_name = go_symbol_package_name (function); + gdb::unique_xmalloc_ptr<char> package_name + = go_symbol_package_name (function); if (package_name != NULL) return package_name; diff --git a/gdb/go-lang.h b/gdb/go-lang.h index f0929cc3ac5..8edfe6ed53a 100644 --- a/gdb/go-lang.h +++ b/gdb/go-lang.h @@ -62,9 +62,14 @@ extern const char *go_main_name (void); extern enum go_type go_classify_struct_type (struct type *type); -extern char *go_symbol_package_name (const struct symbol *sym); - -extern char *go_block_package_name (const struct block *block); +/* Given a Go symbol, return its package or nullptr if unknown. */ +extern gdb::unique_xmalloc_ptr<char> go_symbol_package_name + (const struct symbol *sym); + +/* Return the package that BLOCK is in, or nullptr if there isn't + one. */ +extern gdb::unique_xmalloc_ptr<char> go_block_package_name + (const struct block *block); extern const struct builtin_go_type *builtin_go_type (struct gdbarch *); -- 2.35.3
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