diff options
Diffstat (limited to 'gcc/cp/call.c')
| -rw-r--r-- | gcc/cp/call.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/gcc/cp/call.c b/gcc/cp/call.c index 9a22398..32ccfc9 100644 --- a/gcc/cp/call.c +++ b/gcc/cp/call.c @@ -217,6 +217,7 @@ static conversion *merge_conversion_sequences (conversion *, conversion *); static tree build_temp (tree, tree, int, diagnostic_t *, tsubst_flags_t); static conversion *build_identity_conv (tree, tree); static inline bool conv_binds_to_array_of_unknown_bound (conversion *); +static tree prevent_lifetime_extension (tree); /* Returns nonzero iff the destructor name specified in NAME matches BASETYPE. NAME can take many forms... */ @@ -5078,7 +5079,10 @@ build_conditional_expr_1 (const op_location_t &loc, /* Make sure that lvalues remain lvalues. See g++.oliva/ext1.C. */ if (glvalue_p (arg1)) - arg2 = arg1 = cp_stabilize_reference (arg1); + { + arg2 = arg1 = cp_stabilize_reference (arg1); + arg2 = arg1 = prevent_lifetime_extension (arg1); + } else arg2 = arg1 = cp_save_expr (arg1); } @@ -12168,6 +12172,24 @@ initialize_reference (tree type, tree expr, return expr; } +/* If *P is an xvalue expression, prevent temporary lifetime extension if it + gets used to initialize a reference. */ + +static tree +prevent_lifetime_extension (tree t) +{ + tree *p = &t; + while (TREE_CODE (*p) == COMPOUND_EXPR) + p = &TREE_OPERAND (*p, 1); + while (handled_component_p (*p)) + p = &TREE_OPERAND (*p, 0); + /* Change a TARGET_EXPR from prvalue to xvalue. */ + if (TREE_CODE (*p) == TARGET_EXPR) + *p = build2 (COMPOUND_EXPR, TREE_TYPE (*p), *p, + move (TARGET_EXPR_SLOT (*p))); + return t; +} + /* Subroutine of extend_ref_init_temps. Possibly extend one initializer, which is bound either to a reference or a std::initializer_list. */ |