From 07f1cf564b3b64096998da79ea1963e100688a0e Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Wed, 27 Aug 2014 08:01:25 +0000 Subject: re PR lto/62239 (ICE: in execute_todo, at passes.c:1795 with LTO) 2014-08-27 Richard Biener PR middle-end/62239 * builtins.c (fold_builtin_strcat_chk): Move to gimple-fold.c. (fold_builtin_3): Do not fold strcat_chk here. * gimple-fold.c (gimple_fold_builtin_strcat_chk): Move here from builtins.c. (gimple_fold_builtin): Fold strcat_chk here. From-SVN: r214564 --- gcc/gimple-fold.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'gcc/gimple-fold.c') diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c index f4fe65b..7538ec0 100644 --- a/gcc/gimple-fold.c +++ b/gcc/gimple-fold.c @@ -1587,6 +1587,41 @@ gimple_fold_builtin_strcat (gimple_stmt_iterator *gsi, return true; } +/* Fold a call to the __strcat_chk builtin FNDECL. DEST, SRC, and SIZE + are the arguments to the call. */ + +static bool +gimple_fold_builtin_strcat_chk (gimple_stmt_iterator *gsi) +{ + gimple stmt = gsi_stmt (*gsi); + tree dest = gimple_call_arg (stmt, 0); + tree src = gimple_call_arg (stmt, 1); + tree size = gimple_call_arg (stmt, 2); + tree fn; + const char *p; + + + p = c_getstr (src); + /* If the SRC parameter is "", return DEST. */ + if (p && *p == '\0') + { + replace_call_with_value (gsi, dest); + return true; + } + + if (! tree_fits_uhwi_p (size) || ! integer_all_onesp (size)) + return false; + + /* If __builtin_strcat_chk is used, assume strcat is available. */ + fn = builtin_decl_explicit (BUILT_IN_STRCAT); + if (!fn) + return false; + + gimple repl = gimple_build_call (fn, 2, dest, src); + replace_call_with_call_and_fold (gsi, repl); + return true; +} + /* Fold a call to the fputs builtin. ARG0 and ARG1 are the arguments to the call. IGNORE is true if the value returned by the builtin will be ignored. UNLOCKED is true is true if this @@ -2569,6 +2604,8 @@ gimple_fold_builtin (gimple_stmt_iterator *gsi) case BUILT_IN_SPRINTF_CHK: case BUILT_IN_VSPRINTF_CHK: return gimple_fold_builtin_sprintf_chk (gsi, DECL_FUNCTION_CODE (callee)); + case BUILT_IN_STRCAT_CHK: + return gimple_fold_builtin_strcat_chk (gsi); default:; } -- cgit v1.1