d: Merge upstream dmd 568496d5b, druntime 178c44ff, phobos 574bf883b.

D front-end changes:

    - Import dmd v2.098.0
    - New ImportC module for compiling preprocessed C11 code into D.
    - New -ftransition=in switch.
    - Improved handling of new 'noreturn' type.

Druntime changes:

    - Import druntime v2.098.0
    - Fix broken import in core.sys.linux.perf_event module (PR103558).

Phobos changes:

    - Import phobos v2.098.0
    - All sources are now compiled with -fpreview=fieldwise.

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 568496d5b.
	* Make-lang.in (D_FRONTEND_OBJS): Add d/common-file.o,
	d/common-outbuffer.o, d/common-string.o, d/file_manager.o,
	d/importc.o.  Remove d/root-outbuffer.o.
	(d/common-%.o): New recipe.
	* d-builtins.cc (build_frontend_type): Update for new front-end
	interface.
	(d_build_d_type_nodes): Set noreturn_type_node.
	* d-codegen.cc (d_build_call): Don't call function if one of the
	arguments is type 'noreturn'.
	(build_vthis_function): Propagate TYPE_QUAL_VOLATILE from original
	function type.
	* d-frontend.cc (eval_builtin): Update signature.
	(getTypeInfoType): Likewise.
	(toObjFile): New function.
	* d-gimplify.cc (d_gimplify_call_expr): Always evaluate arguments from
	left to right.
	* d-lang.cc (d_handle_option): Handle OPT_ftransition_in.
	(d_parse_file): Don't generate D main if it is declared in user code.
	* d-tree.h (CALL_EXPR_ARGS_ORDERED): Remove.
	(enum d_tree_index): Add DTI_BOTTOM_TYPE.
	(noreturn_type_node): New.
	* decl.cc (apply_pragma_crt): Remove.
	(DeclVisitor::visit): Update for new front-end interface.
	(DeclVisitor::visit (PragmaDeclaration *)): Don't handle
	crt_constructor and crt_destructor pragmas.
	(DeclVisitor::visit (VarDeclaration *)): Don't generate declarations
	of type 'noreturn'.
	(DeclVisitor::visit (FuncDeclaration *)): Stop adding parameters when
	'noreturn' type has been encountered.
	(get_symbol_decl): Set DECL_STATIC_CONSTRUCTOR and
	DECL_STATIC_DESTRUCTOR on decl node if requested.
	(aggregate_initializer_decl): Update for new front-end interface.
	* expr.cc (ExprVisitor::visit (CallExp *)): Always use the 'this'
	object as the result of calling any constructor function.
	(ExprVisitor::visit): Update for new front-end interface.
	* gdc.texi (Runtime Options): Document -fmain and -ftransition=in.
	* lang.opt (ftransition=in): New option.
	* modules.cc (get_internal_fn): Update for new front-end interface.
	* types.cc (TypeVisitor::visit): Likewise.
	(TypeVisitor::visit (TypeNoreturn *)): Return noreturn_type_node.
	(TypeVisitor::visit (TypeFunction *)): Stop adding parameters when
	'notreturn' type has been encountered.  Qualify function types that
	return 'noreturn' as TYPE_QUAL_VOLATILE.

libphobos/ChangeLog:

	PR d/103558
	* libdruntime/MERGE: Merge upstream druntime 178c44ff.
	* libdruntime/Makefile.am (DRUNTIME_DSOURCES_LINUX): Add
	core/sys/linux/syscalls.d.
	(DRUNTIME_DSOURCES_OPENBSD): Add core/sys/openbsd/pthread_np.d.
	* libdruntime/Makefile.in: Regenerate.
	* src/MERGE: Merge upstream phobos 574bf883b.
	* src/Makefile.am (D_EXTRA_DFLAGS): Add -fpreview=fieldwise.
	* src/Makefile.in: Regenerate.
	* testsuite/libphobos.exceptions/assert_fail.d: Update test.
	* testsuite/libphobos.betterc/test22336.d: New test.

1 files changed, 30 insertions, 6 deletions

diff --git a/gcc/d/d-codegen.cc b/gcc/d/d-codegen.cc
index 403e3c7..c082ac5 100644
--- a/gcc/d/d-codegen.cc
+++ b/gcc/d/d-codegen.cc
@@ -2140,6 +2140,7 @@ d_build_call (TypeFunction *tf, tree callable, tree object,
   /* Build the argument list for the call.  */
   vec <tree, va_gc> *args = NULL;
   tree saved_args = NULL_TREE;
+  bool noreturn_call = false;
 
   /* If this is a delegate call or a nested function being called as
      a delegate, the object should not be NULL.  */
@@ -2165,9 +2166,9 @@ d_build_call (TypeFunction *tf, tree callable, tree object,
 	    }
 	}
 
-      size_t nparams = tf->parameterList.length ();
+      const size_t nparams = tf->parameterList.length ();
       /* if _arguments[] is the first argument.  */
-      size_t varargs = tf->isDstyleVariadic ();
+      const size_t varargs = tf->isDstyleVariadic ();
 
       /* Assumes arguments->length <= formal_args->length if (!tf->varargs).  */
       for (size_t i = 0; i < arguments->length; ++i)
@@ -2206,6 +2207,11 @@ d_build_call (TypeFunction *tf, tree callable, tree object,
 			      build_address (targ));
 	    }
 
+  	  /* Type `noreturn` is a terminator, as no other arguments can possibly
+  	     be evaluated after it.  */
+  	  if (TREE_TYPE (targ) == noreturn_type_node)
+	    noreturn_call = true;
+
 	  vec_safe_push (args, targ);
 	}
     }
@@ -2217,13 +2223,27 @@ d_build_call (TypeFunction *tf, tree callable, tree object,
       saved_args = compound_expr (callee, saved_args);
     }
 
+  /* If we saw a `noreturn` parameter, any unreachable argument evaluations
+     after it are discarded, as well as the function call itself.  */
+  if (noreturn_call)
+    {
+      if (TREE_SIDE_EFFECTS (callee))
+	saved_args = compound_expr (callee, saved_args);
+
+      tree arg;
+      unsigned int ix;
+
+      FOR_EACH_VEC_SAFE_ELT (args, ix, arg)
+	saved_args = compound_expr (saved_args, arg);
+
+      /* Add a stub result type for the expression.  */
+      tree result = build_zero_cst (TREE_TYPE (ctype));
+      return compound_expr (saved_args, result);
+    }
+
   tree result = build_call_vec (TREE_TYPE (ctype), callee, args);
   SET_EXPR_LOCATION (result, input_location);
 
-  /* Enforce left to right evaluation.  */
-  if (tf->linkage == LINK::d)
-    CALL_EXPR_ARGS_ORDERED (result) = 1;
-
   result = maybe_expand_intrinsic (result);
 
   /* Return the value in a temporary slot so that it can be evaluated
@@ -2296,6 +2316,10 @@ build_vthis_function (tree basetype, tree type)
 			     TYPE_ARG_TYPES (type));
   tree fntype = build_function_type (TREE_TYPE (type), argtypes);
 
+  /* Copy volatile qualifiers from the original function type.  */
+  if (TYPE_QUALS (type) & TYPE_QUAL_VOLATILE)
+    fntype = build_qualified_type (fntype, TYPE_QUAL_VOLATILE);
+
   if (RECORD_OR_UNION_TYPE_P (basetype))
     TYPE_METHOD_BASETYPE (fntype) = TYPE_MAIN_VARIANT (basetype);
   else