From 4cff6abe405f4e4d660ab6f6cf8b29ba9d49d4fd Mon Sep 17 00:00:00 2001 From: Nathan Sidwell Date: Tue, 23 Jan 2001 10:36:26 +0000 Subject: [PATCH] call.c (build_conv): Typo in comment. cp: * call.c (build_conv): Typo in comment. (add_builtin_candidate): Add more explanation. Remove extra test for ENUMERAL_TYPE in {PRE,POST}INCREMENT_EXPR. Allow ENUMERAL_TYPEs for relops and eqops. Add both candidates when we have enumeral types. (add_builtin_candidates): Add more explanation. Add ENUMERAL_TYPE candidates for relops and eqops. (joust): Simplify control flow. Allow a non-template user function to hide a builtin. testsuite: * g++.old-deja/g++.pt/overload14.C: New test. From-SVN: r39197 --- gcc/cp/ChangeLog | 12 ++ gcc/cp/call.c | 103 +++++++++++++----- gcc/testsuite/ChangeLog | 4 + .../g++.old-deja/g++.pt/overload14.C | 20 ++++ 4 files changed, 109 insertions(+), 30 deletions(-) create mode 100644 gcc/testsuite/g++.old-deja/g++.pt/overload14.C diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index 3374dd2e268..f5b46ff6400 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,3 +1,15 @@ +2001-01-23 Nathan Sidwell + + * call.c (build_conv): Typo in comment. + (add_builtin_candidate): Add more explanation. + Remove extra test for ENUMERAL_TYPE in {PRE,POST}INCREMENT_EXPR. + Allow ENUMERAL_TYPEs for relops and eqops. Add both candidates + when we have enumeral types. + (add_builtin_candidates): Add more explanation. Add ENUMERAL_TYPE + candidates for relops and eqops. + (joust): Simplify control flow. Allow a non-template user + function to hide a builtin. + 2001-01-22 Nathan Sidwell * cp-tree.h (unification_kind_t): Add DEDUCE_ORDER. diff --git a/gcc/cp/call.c b/gcc/cp/call.c index fa5a50803bf..793a778525a 100644 --- a/gcc/cp/call.c +++ b/gcc/cp/call.c @@ -608,7 +608,7 @@ build_conv (code, type, from) tree t; int rank = ICS_STD_RANK (from); - /* We can't use buidl1 here because CODE could be USER_CONV, which + /* We can't use buildl1 here because CODE could be USER_CONV, which takes two arguments. In that case, the caller is responsible for filling in the second argument. */ t = make_node (code); @@ -1563,7 +1563,12 @@ promoted_arithmetic_type_p (type) /* Create any builtin operator overload candidates for the operator in question given the converted operand types TYPE1 and TYPE2. The other args are passed through from add_builtin_candidates to - build_builtin_candidate. */ + build_builtin_candidate. + + TYPE1 and TYPE2 may not be permissible, and we must filter them. + If CODE is requires candidates operands of the same type of the kind + of which TYPE1 and TYPE2 are, we add both candidates + CODE (TYPE1, TYPE1) and CODE (TYPE2, TYPE2). */ static struct z_candidate * add_builtin_candidate (candidates, code, code2, fnname, type1, type2, @@ -1611,8 +1616,7 @@ add_builtin_candidate (candidates, code, code2, fnname, type1, type2, return candidates; case POSTINCREMENT_EXPR: case PREINCREMENT_EXPR: - if ((ARITHMETIC_TYPE_P (type1) && TREE_CODE (type1) != ENUMERAL_TYPE) - || TYPE_PTROB_P (type1)) + if (ARITHMETIC_TYPE_P (type1) || TYPE_PTROB_P (type1)) { type1 = build_reference_type (type1); break; @@ -1712,8 +1716,8 @@ add_builtin_candidate (candidates, code, code2, fnname, type1, type2, candidate operator functions of the form112) ptrdiff_t operator-(T, T); - 16For every pointer type T, there exist candidate operator functions of - the form + 16For every enumeral or pointer type T, there exist candidate operator + functions of the form bool operator<(T, T); bool operator>(T, T); bool operator<=(T, T); @@ -1757,15 +1761,19 @@ add_builtin_candidate (candidates, code, code2, fnname, type1, type2, type1 = type2; break; } + /* FALLTHROUGH */ case LT_EXPR: case GT_EXPR: case LE_EXPR: case GE_EXPR: case MAX_EXPR: case MIN_EXPR: - if ((ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2)) - || (TYPE_PTR_P (type1) && TYPE_PTR_P (type2))) + if (ARITHMETIC_TYPE_P (type1) && ARITHMETIC_TYPE_P (type2)) + break; + if (TYPE_PTR_P (type1) && TYPE_PTR_P (type2)) break; + if (TREE_CODE (type1) == ENUMERAL_TYPE && TREE_CODE (type2) == ENUMERAL_TYPE) + break; if (TYPE_PTR_P (type1) && null_ptr_cst_p (args[1])) { type2 = type1; @@ -1940,15 +1948,16 @@ add_builtin_candidate (candidates, code, code2, fnname, type1, type2, my_friendly_abort (367); } - /* If we're dealing with two pointer types, we need candidates - for both of them. */ + /* If we're dealing with two pointer types or two enumeral types, + we need candidates for both of them. */ if (type2 && !same_type_p (type1, type2) && TREE_CODE (type1) == TREE_CODE (type2) && (TREE_CODE (type1) == REFERENCE_TYPE || (TREE_CODE (type1) == POINTER_TYPE && TYPE_PTRMEM_P (type1) == TYPE_PTRMEM_P (type2)) || TYPE_PTRMEMFUNC_P (type1) - || IS_AGGR_TYPE (type1))) + || IS_AGGR_TYPE (type1) + || TREE_CODE (type1) == ENUMERAL_TYPE)) { candidates = build_builtin_candidate (candidates, fnname, type1, type1, args, argtypes, flags); @@ -1977,7 +1986,12 @@ type_decays_to (type) 2) pointer-pair taking candidates. These are generated for each type one of the input types converts to. 3) arithmetic candidates. According to the standard, we should generate - all of these, but I'm trying not to... */ + all of these, but I'm trying not to... + + Here we generate a superset of the possible candidates for this particular + case. That is a subset of the full set the standard defines, plus some + other cases which the standard disallows. add_builtin_candidate will + filter out the illegal set. */ static struct z_candidate * add_builtin_candidates (candidates, code, code2, fnname, args, flags) @@ -1987,6 +2001,7 @@ add_builtin_candidates (candidates, code, code2, fnname, args, flags) int flags; { int ref1, i; + int enum_p = 0; tree type, argtypes[3]; /* TYPES[i] is the set of possible builtin-operator parameter types we will consider for the Ith argument. These are represented as @@ -2038,6 +2053,16 @@ add_builtin_candidates (candidates, code, code2, fnname, args, flags) case COMPONENT_REF: return candidates; + case COND_EXPR: + case EQ_EXPR: + case NE_EXPR: + case LT_EXPR: + case LE_EXPR: + case GT_EXPR: + case GE_EXPR: + enum_p = 1; + /* FALLTHROUGH */ + default: ref1 = 0; } @@ -2086,8 +2111,8 @@ add_builtin_candidates (candidates, code, code2, fnname, args, flags) if (i != 0 || ! ref1) { type = TYPE_MAIN_VARIANT (type_decays_to (type)); - if (code == COND_EXPR && TREE_CODE (type) == ENUMERAL_TYPE) - types[i] = tree_cons (NULL_TREE, type, types[i]); + if (enum_p && TREE_CODE (type) == ENUMERAL_TYPE) + types[i] = tree_cons (NULL_TREE, type, types[i]); if (INTEGRAL_TYPE_P (type)) type = type_promotes_to (type); } @@ -2105,8 +2130,8 @@ add_builtin_candidates (candidates, code, code2, fnname, args, flags) if (i != 0 || ! ref1) { type = TYPE_MAIN_VARIANT (type_decays_to (type)); - if (code == COND_EXPR && TREE_CODE (type) == ENUMERAL_TYPE) - types[i] = tree_cons (NULL_TREE, type, types[i]); + if (enum_p && TREE_CODE (type) == ENUMERAL_TYPE) + types[i] = tree_cons (NULL_TREE, type, types[i]); if (INTEGRAL_TYPE_P (type)) type = type_promotes_to (type); } @@ -5186,21 +5211,34 @@ joust (cand1, cand2, warn) if (winner) return winner; - /* or, if not that, - F1 is a non-template function and F2 is a template function */ + /* or, if not that, a non-template function is better than a + template function. */ if (! cand1->template && cand2->template) return 1; else if (cand1->template && ! cand2->template) return -1; else if (cand1->template && cand2->template) - winner = more_specialized - (TI_TEMPLATE (cand1->template), TI_TEMPLATE (cand2->template), - DEDUCE_ORDER, - /* Never do unification on the 'this' parameter. */ - TREE_VEC_LENGTH (cand1->convs) - - DECL_NONSTATIC_MEMBER_FUNCTION_P (cand1->fn)); + { + winner = more_specialized + (TI_TEMPLATE (cand1->template), TI_TEMPLATE (cand2->template), + DEDUCE_ORDER, + /* Never do unification on the 'this' parameter. */ + TREE_VEC_LENGTH (cand1->convs) + - DECL_NONSTATIC_MEMBER_FUNCTION_P (cand1->fn)); + if (winner) + return winner; + } + /* or, if not that, a non-template user function is better than a + builtin. */ + if (TREE_CODE (cand1->fn) != IDENTIFIER_NODE + && TREE_CODE (cand2->fn) == IDENTIFIER_NODE) + return 1; + else if (TREE_CODE (cand1->fn) == IDENTIFIER_NODE + && TREE_CODE (cand2->fn) != IDENTIFIER_NODE) + return -1; + /* or, if not that, the context is an initialization by user-defined conversion (see _dcl.init_ and _over.match.user_) and the standard conversion @@ -5209,11 +5247,15 @@ joust (cand1, cand2, warn) sequence than the standard conversion sequence from the return type of F2 to the destination type. */ - if (! winner && cand1->second_conv) - winner = compare_ics (cand1->second_conv, cand2->second_conv); - + if (cand1->second_conv) + { + winner = compare_ics (cand1->second_conv, cand2->second_conv); + if (winner) + return winner; + } + /* If the built-in candidates are the same, arbitrarily pick one. */ - if (! winner && cand1->fn == cand2->fn + if (cand1->fn == cand2->fn && TREE_CODE (cand1->fn) == IDENTIFIER_NODE) { for (i = 0; i < len; ++i) @@ -5253,7 +5295,7 @@ tweak: /* Extension: If the worst conversion for one candidate is worse than the worst conversion for the other, take the first. */ - if (! winner && ! pedantic) + if (!pedantic) { int rank1 = IDENTITY_RANK, rank2 = IDENTITY_RANK; @@ -5271,7 +5313,8 @@ tweak: return -1; } - return winner; + my_friendly_assert (!winner, 20010121); + return 0; } /* Given a list of candidates for overloading, find the best one, if any. diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d89997cb9a9..31f25fb58c5 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2001-01-23 Nathan Sidwell + + * g++.old-deja/g++.pt/overload14.C: New test. + 2001-01-22 Franz Sirl * gcc.c-torture/execute/20010122-1.c: New test, exercise diff --git a/gcc/testsuite/g++.old-deja/g++.pt/overload14.C b/gcc/testsuite/g++.old-deja/g++.pt/overload14.C new file mode 100644 index 00000000000..022326e65d8 --- /dev/null +++ b/gcc/testsuite/g++.old-deja/g++.pt/overload14.C @@ -0,0 +1,20 @@ +// Build don't link: +// +// Copyright (C) 2000 Free Software Foundation, Inc. +// Contributed by Nathan Sidwell 18 Jan 2001 + +// Bug 1639. We failed to have builtin relop candidates with enumeral type. + +template void operator == (T1, T2); + +enum E {e1}; +void operator != (E, E); + +bool Foo (E e) +{ + return e == e1; +} +bool Baz (E e) +{ + return e != e1; // ERROR - void not ignored. +} -- 2.30.2