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| author | Jakub Jelinek <jakub@redhat.com> | 2002-02-26 22:08:57 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2002-02-26 22:08:57 +0100 |
| commit | 6d73371a68e805956981592bdc2a631acaab2a33 (patch) | |
| tree | ffe0e0f8a4d6f5960820d5d8fa900f3c93267c2f /gcc/dwarf2out.c | |
| parent | 2d13abcf868ab46317b62f14702fa62c7948f212 (diff) | |
| download | gcc-6d73371a68e805956981592bdc2a631acaab2a33.zip gcc-6d73371a68e805956981592bdc2a631acaab2a33.tar.gz gcc-6d73371a68e805956981592bdc2a631acaab2a33.tar.bz2 | |
re PR debug/5770 (undefined reference to `.LC0')
PR debug/5770
* dwarf2out.c (rtl_for_decl_location): Return CONST_STRING for
STRING_CST initializer spanning the whole variable without
embedded zeros.
If expand_expr returned MEM, don't use it.
* g++.dg/debug/debug4.C: New test.
From-SVN: r50058
Diffstat (limited to 'gcc/dwarf2out.c')
| -rw-r--r-- | gcc/dwarf2out.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c index f4c298a..6c08939 100644 --- a/gcc/dwarf2out.c +++ b/gcc/dwarf2out.c @@ -8902,8 +8902,38 @@ rtl_for_decl_location (decl) and will have been substituted directly into all expressions that use it. C does not have such a concept, but C++ and other languages do. */ else if (TREE_CODE (decl) == VAR_DECL && DECL_INITIAL (decl)) - rtl = expand_expr (DECL_INITIAL (decl), NULL_RTX, VOIDmode, - EXPAND_INITIALIZER); + { + /* If a variable is initialized with a string constant without embedded + zeros, build CONST_STRING. */ + if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST + && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) + { + tree arrtype = TREE_TYPE (decl); + tree enttype = TREE_TYPE (arrtype); + tree domain = TYPE_DOMAIN (arrtype); + tree init = DECL_INITIAL (decl); + enum machine_mode mode = TYPE_MODE (enttype); + + if (GET_MODE_CLASS (mode) == MODE_INT && GET_MODE_SIZE (mode) == 1 + && domain + && integer_zerop (TYPE_MIN_VALUE (domain)) + && compare_tree_int (TYPE_MAX_VALUE (domain), + TREE_STRING_LENGTH (init) - 1) == 0 + && ((size_t) TREE_STRING_LENGTH (init) + == strlen (TREE_STRING_POINTER (init)) + 1)) + rtl = gen_rtx_CONST_STRING (VOIDmode, TREE_STRING_POINTER (init)); + } + + if (rtl == NULL) + { + rtl = expand_expr (DECL_INITIAL (decl), NULL_RTX, VOIDmode, + EXPAND_INITIALIZER); + /* If expand_expr returned a MEM, we cannot use it, since + it won't be output, leading to unresolved symbol. */ + if (rtl && GET_CODE (rtl) == MEM) + rtl = NULL; + } + } return rtl; } |