[PATCH][1/2] GIMPLE Frontend, C FE parts (and GIMPLE parser)

Richard Biener rguenther@suse.de
Fri Oct 28 11:47:00 GMT 2016


These are the C (and ObjC) Frontend changes required by the GIMPLE
Frontend which is now itself contained in c/gimple-parser.[ch].

Most changes are due to a new c-parser.h header where we export
stuff from the C parser that the GIMPLE frontend requires.  Other
changes include new __GIMPLE and __PHI keywords, handling
__GIMPLE as new declspec and dispatching to the GIMPLE parser
for __GIMPLE marked function definitions.

We'd like to include the GIMPLE parser for GCC 7, as the parser
is pretty self-contained (and now works to a good extent) it can
be improved during stage3 or when testcases show that it needs
improvement.

Bootstrapped and tested on x86_64-unknown-linux-gnu (together with [2/2])
for C, ObjC.

Ok for trunk?

Thanks,
Richard.

2016-10-28  Prasad Ghangal  <prasad.ghangal@gmail.com>
	Richard Biener  <rguenther@suse.de>
    
    	c/
    	* Make-lang.in (C_AND_OBJC_OBJS): Add gimple-parser.o.
    	* config-lang.in (gtfiles): Add c/c-parser.h.
    	* c-tree.h (enum c_declspec_word): Add cdw_gimple.
    	(struct c_declspecs): Add gimple_pass member and gimple_p flag.
    	* c-parser.c (enum c_id_kind, struct c_token,
    	c_parser_next_token_is, c_parser_next_token_is_not,
    	c_parser_next_token_is_keyword,
    	enum c_lookahead_kind, enum c_dtr_syn, enum c_parser_prec):
    	Split out to ...
    	* c-parser.h: ... new header.
    	* c-parser.c: Include c-parser.h and gimple-parser.h.
	(c_parser_peek_token, c_parser_peek_2nd_token,
    	c_token_starts_typename, c_parser_next_token_starts_declspecs,
    	c_parser_next_tokens_start_declaration, c_parser_consume_token,
    	c_parser_error, c_parser_require, c_parser_skip_until_found,
    	c_parser_declspecs, c_parser_declarator, c_parser_peek_nth_token,
    	c_parser_cast_expression): Export.
    	(c_parser_tokens_buf): New function.
    	(c_parser_error): Likewise.
    	(c_parser_set_error): Likewise.
    	(c_parser_declspecs): Handle RID_GIMPLE.
	(c_parser_declaration_or_fndef): Parse __GIMPLE marked body
	via c_parser_parse_gimple_body.
    	* c-parser.h (c_parser_peek_token, c_parser_peek_2nd_token,
    	c_token_starts_typename, c_parser_next_token_starts_declspecs,
    	c_parser_next_tokens_start_declaration, c_parser_consume_token,
    	c_parser_error, c_parser_require, c_parser_skip_until_found,
    	c_parser_declspecs, c_parser_declarator, c_parser_peek_nth_token,
    	c_parser_cast_expression): Declare.
	(struct c_parser): Declare forward.
	(c_parser_tokens_buf): Declare.
        (c_parser_error): Likewise.
        (c_parser_set_error): Likewise.
    	* gimple-parser.c: New file.
    	* gimple-parser.h: Likewise.
    
    	obj-c/
    	* config-lang.in (gtfiles): Add c/c-parser.h.

    	c-family/
    	* c-common.h (c_common_resword): Add RID_GIMPLE, RID_PHI types.
    	* c-common.h (enum rid): Add RID_GIMPLE, RID_PHI.
    	* c.opt (fgimple): New option.

	* doc/invoke.texi (fgimple): Document.
 
diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index 307862b..2997c83 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -435,6 +435,8 @@ const struct c_common_resword c_common_reswords[] =
   { "__underlying_type", RID_UNDERLYING_TYPE, D_CXXONLY },
   { "__volatile",	RID_VOLATILE,	0 },
   { "__volatile__",	RID_VOLATILE,	0 },
+  { "__GIMPLE",		RID_GIMPLE,	D_CONLY },
+  { "__PHI",		RID_PHI,	D_CONLY },
   { "alignas",		RID_ALIGNAS,	D_CXXONLY | D_CXX11 | D_CXXWARN },
   { "alignof",		RID_ALIGNOF,	D_CXXONLY | D_CXX11 | D_CXXWARN },
   { "asm",		RID_ASM,	D_ASM },
diff --git a/gcc/c-family/c-common.h b/gcc/c-family/c-common.h
index 547bab2..1fbe060 100644
--- a/gcc/c-family/c-common.h
+++ b/gcc/c-family/c-common.h
@@ -118,6 +118,12 @@ enum rid
 
   RID_FRACT, RID_ACCUM, RID_AUTO_TYPE, RID_BUILTIN_CALL_WITH_STATIC_CHAIN,
 
+  /* "__GIMPLE", for the GIMPLE-parsing extension to the C frontend. */
+  RID_GIMPLE,
+
+  /* "__PHI", for parsing PHI function in GIMPLE FE.  */
+  RID_PHI,
+
   /* C11 */
   RID_ALIGNAS, RID_GENERIC,
 
diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 458d453..24d3b8e 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -200,6 +200,10 @@ F
 Driver C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
 -F <dir>	Add <dir> to the end of the main framework include path.
 
+fgimple
+C Var(flag_gimple) Init(0)
+Enable parsing GIMPLE.
+
 H
 C ObjC C++ ObjC++
 Print the name of header files as they are used.
diff --git a/gcc/c/Make-lang.in b/gcc/c/Make-lang.in
index 72c9ae7..cd7108b 100644
--- a/gcc/c/Make-lang.in
+++ b/gcc/c/Make-lang.in
@@ -51,7 +51,8 @@ CFLAGS-c/gccspec.o += $(DRIVER_DEFINES)
 # Language-specific object files for C and Objective C.
 C_AND_OBJC_OBJS = attribs.o c/c-errors.o c/c-decl.o c/c-typeck.o \
   c/c-convert.o c/c-aux-info.o c/c-objc-common.o c/c-parser.o \
-  c/c-array-notation.o c/c-fold.o $(C_COMMON_OBJS) $(C_TARGET_OBJS)
+  c/c-array-notation.o c/c-fold.o c/gimple-parser.o \
+  $(C_COMMON_OBJS) $(C_TARGET_OBJS)
 
 # Language-specific object files for C.
 C_OBJS = c/c-lang.o c-family/stub-objc.o $(C_AND_OBJC_OBJS)
diff --git a/gcc/c/c-parser.c b/gcc/c/c-parser.c
index 6bc42da..d21b8e9 100644
--- a/gcc/c/c-parser.c
+++ b/gcc/c/c-parser.c
@@ -59,6 +59,8 @@ along with GCC; see the file COPYING3.  If not see
 #include "gimple-expr.h"
 #include "context.h"
 #include "gcc-rich-location.h"
+#include "c-parser.h"
+#include "gimple-parser.h"
 
 /* We need to walk over decls with incomplete struct/union/enum types
    after parsing the whole translation unit.
@@ -150,63 +152,6 @@ c_parse_init (void)
     }
 }
 
-/* The C lexer intermediates between the lexer in cpplib and c-lex.c
-   and the C parser.  Unlike the C++ lexer, the parser structure
-   stores the lexer information instead of using a separate structure.
-   Identifiers are separated into ordinary identifiers, type names,
-   keywords and some other Objective-C types of identifiers, and some
-   look-ahead is maintained.
-
-   ??? It might be a good idea to lex the whole file up front (as for
-   C++).  It would then be possible to share more of the C and C++
-   lexer code, if desired.  */
-
-/* More information about the type of a CPP_NAME token.  */
-enum c_id_kind {
-  /* An ordinary identifier.  */
-  C_ID_ID,
-  /* An identifier declared as a typedef name.  */
-  C_ID_TYPENAME,
-  /* An identifier declared as an Objective-C class name.  */
-  C_ID_CLASSNAME,
-  /* An address space identifier.  */
-  C_ID_ADDRSPACE,
-  /* Not an identifier.  */
-  C_ID_NONE
-};
-
-/* A single C token after string literal concatenation and conversion
-   of preprocessing tokens to tokens.  */
-struct GTY (()) c_token {
-  /* The kind of token.  */
-  ENUM_BITFIELD (cpp_ttype) type : 8;
-  /* If this token is a CPP_NAME, this value indicates whether also
-     declared as some kind of type.  Otherwise, it is C_ID_NONE.  */
-  ENUM_BITFIELD (c_id_kind) id_kind : 8;
-  /* If this token is a keyword, this value indicates which keyword.
-     Otherwise, this value is RID_MAX.  */
-  ENUM_BITFIELD (rid) keyword : 8;
-  /* If this token is a CPP_PRAGMA, this indicates the pragma that
-     was seen.  Otherwise it is PRAGMA_NONE.  */
-  ENUM_BITFIELD (pragma_kind) pragma_kind : 8;
-  /* The location at which this token was found.  */
-  location_t location;
-  /* The value associated with this token, if any.  */
-  tree value;
-  /* Token flags.  */
-  unsigned char flags;
-
-  source_range get_range () const
-  {
-    return get_range_from_loc (line_table, location);
-  }
-
-  location_t get_finish () const
-  {
-    return get_range ().m_finish;
-  }
-};
-
 /* A parser structure recording information about the state and
    context of parsing.  Includes lexer information with up to two
    tokens of look-ahead; more are not needed for C.  */
@@ -259,6 +204,30 @@ struct GTY(()) c_parser {
   vec <c_token, va_gc> *cilk_simd_fn_tokens;
 };
 
+/* Return a pointer to the Nth token in PARERs tokens_buf.  */
+
+c_token *
+c_parser_tokens_buf (c_parser *parser, unsigned n)
+{
+  return &parser->tokens_buf[n];
+}
+
+/* Return the error state of PARSER.  */
+
+bool
+c_parser_error (c_parser *parser)
+{
+  return parser->error;
+}
+
+/* Set the error state of PARSER to ERR.  */
+
+void
+c_parser_set_error (c_parser *parser, bool err)
+{
+  parser->error = err;
+}
+
 
 /* The actual parser and external interface.  ??? Does this need to be
    garbage-collected?  */
@@ -454,7 +423,7 @@ c_lex_one_token (c_parser *parser, c_token *token)
 /* Return a pointer to the next token from PARSER, reading it in if
    necessary.  */
 
-static inline c_token *
+c_token *
 c_parser_peek_token (c_parser *parser)
 {
   if (parser->tokens_avail == 0)
@@ -465,37 +434,10 @@ c_parser_peek_token (c_parser *parser)
   return &parser->tokens[0];
 }
 
-/* Return true if the next token from PARSER has the indicated
-   TYPE.  */
-
-static inline bool
-c_parser_next_token_is (c_parser *parser, enum cpp_ttype type)
-{
-  return c_parser_peek_token (parser)->type == type;
-}
-
-/* Return true if the next token from PARSER does not have the
-   indicated TYPE.  */
-
-static inline bool
-c_parser_next_token_is_not (c_parser *parser, enum cpp_ttype type)
-{
-  return !c_parser_next_token_is (parser, type);
-}
-
-/* Return true if the next token from PARSER is the indicated
-   KEYWORD.  */
-
-static inline bool
-c_parser_next_token_is_keyword (c_parser *parser, enum rid keyword)
-{
-  return c_parser_peek_token (parser)->keyword == keyword;
-}
-
 /* Return a pointer to the next-but-one token from PARSER, reading it
    in if necessary.  The next token is already read in.  */
 
-static c_token *
+c_token *
 c_parser_peek_2nd_token (c_parser *parser)
 {
   if (parser->tokens_avail >= 2)
@@ -511,7 +453,7 @@ c_parser_peek_2nd_token (c_parser *parser)
 /* Return a pointer to the Nth token from PARSER, reading it
    in if necessary.  The N-1th token is already read in.  */
 
-static c_token *
+c_token *
 c_parser_peek_nth_token (c_parser *parser, unsigned int n)
 {
   /* N is 1-based, not zero-based.  */
@@ -570,7 +512,7 @@ c_keyword_starts_typename (enum rid keyword)
 
 /* Return true if TOKEN can start a type name,
    false otherwise.  */
-static bool
+bool
 c_token_starts_typename (c_token *token)
 {
   switch (token->type)
@@ -601,18 +543,6 @@ c_token_starts_typename (c_token *token)
     }
 }
 
-enum c_lookahead_kind {
-  /* Always treat unknown identifiers as typenames.  */
-  cla_prefer_type,
-
-  /* Could be parsing a nonabstract declarator.  Only treat an identifier
-     as a typename if followed by another identifier or a star.  */
-  cla_nonabstract_decl,
-
-  /* Never treat identifiers as typenames.  */
-  cla_prefer_id
-};
-
 /* Return true if the next token from PARSER can start a type name,
    false otherwise.  LA specifies how to do lookahead in order to
    detect unknown type names.  If unsure, pick CLA_PREFER_ID.  */
@@ -779,7 +709,7 @@ c_token_starts_declaration (c_token *token)
 
 /* Return true if the next token from PARSER can start declaration
    specifiers, false otherwise.  */
-static inline bool
+bool
 c_parser_next_token_starts_declspecs (c_parser *parser)
 {
   c_token *token = c_parser_peek_token (parser);
@@ -801,7 +731,7 @@ c_parser_next_token_starts_declspecs (c_parser *parser)
 
 /* Return true if the next tokens from PARSER can start declaration
    specifiers or a static assertion, false otherwise.  */
-static inline bool
+bool
 c_parser_next_tokens_start_declaration (c_parser *parser)
 {
   c_token *token = c_parser_peek_token (parser);
@@ -829,7 +759,7 @@ c_parser_next_tokens_start_declaration (c_parser *parser)
 
 /* Consume the next token from PARSER.  */
 
-static void
+void
 c_parser_consume_token (c_parser *parser)
 {
   gcc_assert (parser->tokens_avail >= 1);
@@ -922,7 +852,7 @@ c_parser_peek_conflict_marker (c_parser *parser, enum cpp_ttype tok1_kind,
    this way is not i18n-friendly and some other approach should be
    used.  */
 
-static void
+void
 c_parser_error (c_parser *parser, const char *gmsgid)
 {
   c_token *token = c_parser_peek_token (parser);
@@ -965,7 +895,7 @@ c_parser_error (c_parser *parser, const char *gmsgid)
    been produced and no message will be produced this time.  Returns
    true if found, false otherwise.  */
 
-static bool
+bool
 c_parser_require (c_parser *parser,
 		  enum cpp_ttype type,
 		  const char *msgid)
@@ -1008,7 +938,7 @@ c_parser_require_keyword (c_parser *parser,
    already been produced and no message will be produced this
    time.  */
 
-static void
+void
 c_parser_skip_until_found (c_parser *parser,
 			   enum cpp_ttype type,
 			   const char *msgid)
@@ -1243,42 +1173,6 @@ restore_extension_diagnostics (int flags)
   warn_c99_c11_compat = (flags >> 9) & 1 ? 1 : ((flags >> 10) & 1 ? -1 : 0);
 }
 
-/* Possibly kinds of declarator to parse.  */
-enum c_dtr_syn {
-  /* A normal declarator with an identifier.  */
-  C_DTR_NORMAL,
-  /* An abstract declarator (maybe empty).  */
-  C_DTR_ABSTRACT,
-  /* A parameter declarator: may be either, but after a type name does
-     not redeclare a typedef name as an identifier if it can
-     alternatively be interpreted as a typedef name; see DR#009,
-     applied in C90 TC1, omitted from C99 and reapplied in C99 TC2
-     following DR#249.  For example, given a typedef T, "int T" and
-     "int *T" are valid parameter declarations redeclaring T, while
-     "int (T)" and "int * (T)" and "int (T[])" and "int (T (int))" are
-     abstract declarators rather than involving redundant parentheses;
-     the same applies with attributes inside the parentheses before
-     "T".  */
-  C_DTR_PARM
-};
-
-/* The binary operation precedence levels, where 0 is a dummy lowest level
-   used for the bottom of the stack.  */
-enum c_parser_prec {
-  PREC_NONE,
-  PREC_LOGOR,
-  PREC_LOGAND,
-  PREC_BITOR,
-  PREC_BITXOR,
-  PREC_BITAND,
-  PREC_EQ,
-  PREC_REL,
-  PREC_SHIFT,
-  PREC_ADD,
-  PREC_MULT,
-  NUM_PRECS
-};
-
 /* Helper data structure for parsing #pragma acc routine.  */
 struct oacc_routine_data {
   bool error_seen; /* Set if error has been reported.  */
@@ -1295,15 +1189,11 @@ static void c_parser_declaration_or_fndef (c_parser *, bool, bool, bool,
 					   bool * = NULL);
 static void c_parser_static_assert_declaration_no_semi (c_parser *);
 static void c_parser_static_assert_declaration (c_parser *);
-static void c_parser_declspecs (c_parser *, struct c_declspecs *, bool, bool,
-				bool, bool, bool, enum c_lookahead_kind);
 static struct c_typespec c_parser_enum_specifier (c_parser *);
 static struct c_typespec c_parser_struct_or_union_specifier (c_parser *);
 static tree c_parser_struct_declaration (c_parser *);
 static struct c_typespec c_parser_typeof_specifier (c_parser *);
 static tree c_parser_alignas_specifier (c_parser *);
-static struct c_declarator *c_parser_declarator (c_parser *, bool, c_dtr_syn,
-						 bool *);
 static struct c_declarator *c_parser_direct_declarator (c_parser *, bool,
 							c_dtr_syn, bool *);
 static struct c_declarator *c_parser_direct_declarator_inner (c_parser *,
@@ -1343,7 +1233,6 @@ static struct c_expr c_parser_conditional_expression (c_parser *,
 						      struct c_expr *, tree);
 static struct c_expr c_parser_binary_expression (c_parser *, struct c_expr *,
 						 tree);
-static struct c_expr c_parser_cast_expression (c_parser *, struct c_expr *);
 static struct c_expr c_parser_unary_expression (c_parser *);
 static struct c_expr c_parser_sizeof_expression (c_parser *);
 static struct c_expr c_parser_alignof_expression (c_parser *);
@@ -1652,7 +1541,13 @@ static void c_finish_oacc_routine (struct oacc_routine_data *, tree, bool);
    OpenMP:
 
    declaration:
-     threadprivate-directive  */
+     threadprivate-directive
+
+   GIMPLE:
+
+   gimple-function-definition:
+     declaration-specifiers[opt] __GIMPLE (gimple-pass-list) declarator
+       declaration-list[opt] compound-statement  */
 
 static void
 c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok,
@@ -1752,6 +1647,7 @@ c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok,
       c_parser_skip_to_end_of_block_or_statement (parser);
       return;
     }
+
   finish_declspecs (specs);
   bool auto_type_p = specs->typespec_word == cts_auto_type;
   if (c_parser_next_token_is (parser, CPP_SEMICOLON))
@@ -1882,7 +1778,7 @@ c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok,
       struct c_declarator *declarator;
       bool dummy = false;
       timevar_id_t tv;
-      tree fnbody;
+      tree fnbody = NULL_TREE;
       /* Declaring either one or more declarators (in which case we
 	 should diagnose if there were no declaration specifiers) or a
 	 function definition (in which case the diagnostic for
@@ -2173,9 +2069,24 @@ c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok,
 	c_finish_oacc_routine (oacc_routine_data, current_function_decl, true);
       DECL_STRUCT_FUNCTION (current_function_decl)->function_start_locus
 	= c_parser_peek_token (parser)->location;
-      fnbody = c_parser_compound_statement (parser);
-      if (flag_cilkplus && contains_array_notation_expr (fnbody))
-	fnbody = expand_array_notation_exprs (fnbody);
+
+      /* If the definition was marked with __GIMPLE then parse the
+         function body as GIMPLE.  */
+      if (specs->gimple_p)
+	{
+	  cfun->pass_startwith = specs->gimple_pass;
+	  bool saved = in_late_binary_op;
+	  in_late_binary_op = true;
+	  c_parser_parse_gimple_body (parser);
+	  in_late_binary_op = saved;
+	}
+      else
+	{
+	  fnbody = c_parser_compound_statement (parser);
+	  if (flag_cilkplus && contains_array_notation_expr (fnbody))
+	    fnbody = expand_array_notation_exprs (fnbody);
+	}
+      tree fndecl = current_function_decl;
       if (nested)
 	{
 	  tree decl = current_function_decl;
@@ -2191,9 +2102,13 @@ c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok,
 	}
       else
 	{
-	  add_stmt (fnbody);
+	  if (fnbody)
+	    add_stmt (fnbody);
 	  finish_function ();
 	}
+      /* Get rid of the empty stmt list for GIMPLE.  */
+      if (specs->gimple_p)
+	DECL_SAVED_TREE (fndecl) = NULL_TREE;
 
       timevar_pop (tv);
       break;
@@ -2416,7 +2331,7 @@ c_parser_static_assert_declaration_no_semi (c_parser *parser)
      objc-protocol-refs
 */
 
-static void
+void
 c_parser_declspecs (c_parser *parser, struct c_declspecs *specs,
 		    bool scspec_ok, bool typespec_ok, bool start_attr_ok,
 		    bool alignspec_ok, bool auto_type_ok,
@@ -2681,6 +2596,14 @@ c_parser_declspecs (c_parser *parser, struct c_declspecs *specs,
 	  align = c_parser_alignas_specifier (parser);
 	  declspecs_add_alignas (loc, specs, align);
 	  break;
+	case RID_GIMPLE:
+	  if (! flag_gimple)
+	    error_at (loc, "%<__GIMPLE%> only valid with -fgimple");
+	  c_parser_consume_token (parser);
+	  specs->gimple_p = true;
+	  specs->locations[cdw_gimple] = loc;
+	  specs->gimple_pass = c_parser_gimple_pass_list (parser);
+	  break;
 	default:
 	  goto out;
 	}
@@ -3415,7 +3338,7 @@ c_parser_alignas_specifier (c_parser * parser)
    This function also accepts an omitted abstract declarator as being
    an abstract declarator, although not part of the formal syntax.  */
 
-static struct c_declarator *
+struct c_declarator *
 c_parser_declarator (c_parser *parser, bool type_seen_p, c_dtr_syn kind,
 		     bool *seen_id)
 {
@@ -6866,7 +6789,7 @@ c_parser_binary_expression (c_parser *parser, struct c_expr *after,
      ( type-name ) unary-expression
 */
 
-static struct c_expr
+struct c_expr
 c_parser_cast_expression (c_parser *parser, struct c_expr *after)
 {
   location_t cast_loc = c_parser_peek_token (parser)->location;
diff --git a/gcc/c/c-parser.h b/gcc/c/c-parser.h
new file mode 100644
index 0000000..04fa681
--- /dev/null
+++ b/gcc/c/c-parser.h
@@ -0,0 +1,189 @@
+/* Declarations for the parser for C and Objective-C.
+   Copyright (C) 1987-2016 Free Software Foundation, Inc.
+
+   Parser actions based on the old Bison parser; structure somewhat
+   influenced by and fragments based on the C++ parser.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_C_PARSER_H
+#define GCC_C_PARSER_H
+
+/* The C lexer intermediates between the lexer in cpplib and c-lex.c
+   and the C parser.  Unlike the C++ lexer, the parser structure
+   stores the lexer information instead of using a separate structure.
+   Identifiers are separated into ordinary identifiers, type names,
+   keywords and some other Objective-C types of identifiers, and some
+   look-ahead is maintained.
+
+   ??? It might be a good idea to lex the whole file up front (as for
+   C++).  It would then be possible to share more of the C and C++
+   lexer code, if desired.  */
+
+/* More information about the type of a CPP_NAME token.  */
+enum c_id_kind {
+  /* An ordinary identifier.  */
+  C_ID_ID,
+  /* An identifier declared as a typedef name.  */
+  C_ID_TYPENAME,
+  /* An identifier declared as an Objective-C class name.  */
+  C_ID_CLASSNAME,
+  /* An address space identifier.  */
+  C_ID_ADDRSPACE,
+  /* Not an identifier.  */
+  C_ID_NONE
+};
+
+/* A single C token after string literal concatenation and conversion
+   of preprocessing tokens to tokens.  */
+struct GTY (()) c_token {
+  /* The kind of token.  */
+  ENUM_BITFIELD (cpp_ttype) type : 8;
+  /* If this token is a CPP_NAME, this value indicates whether also
+     declared as some kind of type.  Otherwise, it is C_ID_NONE.  */
+  ENUM_BITFIELD (c_id_kind) id_kind : 8;
+  /* If this token is a keyword, this value indicates which keyword.
+     Otherwise, this value is RID_MAX.  */
+  ENUM_BITFIELD (rid) keyword : 8;
+  /* If this token is a CPP_PRAGMA, this indicates the pragma that
+     was seen.  Otherwise it is PRAGMA_NONE.  */
+  ENUM_BITFIELD (pragma_kind) pragma_kind : 8;
+  /* The location at which this token was found.  */
+  location_t location;
+  /* The value associated with this token, if any.  */
+  tree value;
+  /* Token flags.  */
+  unsigned char flags;
+
+  source_range get_range () const
+  {
+    return get_range_from_loc (line_table, location);
+  }
+
+  location_t get_finish () const
+  {
+    return get_range ().m_finish;
+  }
+};
+
+/* The parser.  */
+struct c_parser;
+
+/* Possibly kinds of declarator to parse.  */
+enum c_dtr_syn {
+  /* A normal declarator with an identifier.  */
+  C_DTR_NORMAL,
+  /* An abstract declarator (maybe empty).  */
+  C_DTR_ABSTRACT,
+  /* A parameter declarator: may be either, but after a type name does
+     not redeclare a typedef name as an identifier if it can
+     alternatively be interpreted as a typedef name; see DR#009,
+     applied in C90 TC1, omitted from C99 and reapplied in C99 TC2
+     following DR#249.  For example, given a typedef T, "int T" and
+     "int *T" are valid parameter declarations redeclaring T, while
+     "int (T)" and "int * (T)" and "int (T[])" and "int (T (int))" are
+     abstract declarators rather than involving redundant parentheses;
+     the same applies with attributes inside the parentheses before
+     "T".  */
+  C_DTR_PARM
+};
+
+/* The binary operation precedence levels, where 0 is a dummy lowest level
+   used for the bottom of the stack.  */
+enum c_parser_prec {
+  PREC_NONE,
+  PREC_LOGOR,
+  PREC_LOGAND,
+  PREC_BITOR,
+  PREC_BITXOR,
+  PREC_BITAND,
+  PREC_EQ,
+  PREC_REL,
+  PREC_SHIFT,
+  PREC_ADD,
+  PREC_MULT,
+  NUM_PRECS
+};
+
+enum c_lookahead_kind {
+  /* Always treat unknown identifiers as typenames.  */
+  cla_prefer_type,
+
+  /* Could be parsing a nonabstract declarator.  Only treat an identifier
+     as a typename if followed by another identifier or a star.  */
+  cla_nonabstract_decl,
+
+  /* Never treat identifiers as typenames.  */
+  cla_prefer_id
+};
+
+
+extern c_token * c_parser_peek_token (c_parser *parser);
+extern c_token * c_parser_peek_2nd_token (c_parser *parser);
+extern c_token * c_parser_peek_nth_token (c_parser *parser, unsigned int n);
+extern bool c_parser_require (c_parser *parser, enum cpp_ttype type,
+			      const char *msgid);
+extern void c_parser_error (c_parser *parser, const char *gmsgid);
+extern void c_parser_consume_token (c_parser *parser);
+extern void c_parser_skip_until_found (c_parser *parser, enum cpp_ttype type,
+				       const char *msgid);
+extern bool c_parser_next_token_starts_declspecs (c_parser *parser);
+bool c_parser_next_tokens_start_declaration (c_parser *parser);
+bool c_token_starts_typename (c_token *token);
+
+/* Abstraction to avoid defining c_parser here which messes up gengtype
+   output wrt ObjC due to vec<c_token> routines being put in gtype-c.h
+   but not gtype-objc.h.  */
+extern c_token * c_parser_tokens_buf (c_parser *parser, unsigned n);
+extern bool c_parser_error (c_parser *parser);
+extern void c_parser_set_error (c_parser *parser, bool);
+
+/* Return true if the next token from PARSER has the indicated
+   TYPE.  */
+
+static inline bool
+c_parser_next_token_is (c_parser *parser, enum cpp_ttype type)
+{
+  return c_parser_peek_token (parser)->type == type;
+}
+
+/* Return true if the next token from PARSER does not have the
+   indicated TYPE.  */
+
+static inline bool
+c_parser_next_token_is_not (c_parser *parser, enum cpp_ttype type)
+{
+  return !c_parser_next_token_is (parser, type);
+}
+
+/* Return true if the next token from PARSER is the indicated
+   KEYWORD.  */
+
+static inline bool
+c_parser_next_token_is_keyword (c_parser *parser, enum rid keyword)
+{
+  return c_parser_peek_token (parser)->keyword == keyword;
+}
+
+extern struct c_declarator *
+c_parser_declarator (c_parser *parser, bool type_seen_p, c_dtr_syn kind,
+		     bool *seen_id);
+extern void c_parser_declspecs (c_parser *, struct c_declspecs *, bool, bool,
+				bool, bool, bool, enum c_lookahead_kind);
+extern struct c_expr c_parser_cast_expression (c_parser *, struct c_expr *);
+
+#endif
diff --git a/gcc/c/c-tree.h b/gcc/c/c-tree.h
index e8060f8..a8cf353 100644
--- a/gcc/c/c-tree.h
+++ b/gcc/c/c-tree.h
@@ -267,6 +267,7 @@ enum c_declspec_word {
   cdw_saturating,
   cdw_alignas,
   cdw_address_space,
+  cdw_gimple,
   cdw_number_of_elements /* This one must always be the last
 			    enumerator.  */
 };
@@ -290,6 +291,8 @@ struct c_declspecs {
      NULL; attributes (possibly from multiple lists) will be passed
      separately.  */
   tree attrs;
+  /* The pass to start compiling a __GIMPLE function with.  */
+  char *gimple_pass;
   /* The base-2 log of the greatest alignment required by an _Alignas
      specifier, in bytes, or -1 if no such specifiers with nonzero
      alignment.  */
@@ -362,6 +365,8 @@ struct c_declspecs {
   /* Whether any alignment specifier (even with zero alignment) was
      specified.  */
   BOOL_BITFIELD alignas_p : 1;
+  /* Whether any __GIMPLE specifier was specified.  */
+  BOOL_BITFIELD gimple_p : 1;
   /* The address space that the declaration belongs to.  */
   addr_space_t address_space;
 };
diff --git a/gcc/c/config-lang.in b/gcc/c/config-lang.in
index b9cdc8e..51fbb53 100644
--- a/gcc/c/config-lang.in
+++ b/gcc/c/config-lang.in
@@ -29,4 +29,4 @@ compilers="cc1\$(exeext)"
 
 target_libs=
 
-gtfiles="\$(srcdir)/c/c-lang.c \$(srcdir)/c/c-tree.h \$(srcdir)/c/c-decl.c \$(srcdir)/c-family/c-common.c \$(srcdir)/c-family/c-common.h \$(srcdir)/c-family/c-objc.h \$(srcdir)/c-family/c-cppbuiltin.c \$(srcdir)/c-family/c-pragma.h \$(srcdir)/c-family/c-pragma.c \$(srcdir)/c/c-objc-common.c \$(srcdir)/c/c-parser.c \$(srcdir)/c/c-lang.h"
+gtfiles="\$(srcdir)/c/c-lang.c \$(srcdir)/c/c-tree.h \$(srcdir)/c/c-decl.c \$(srcdir)/c-family/c-common.c \$(srcdir)/c-family/c-common.h \$(srcdir)/c-family/c-objc.h \$(srcdir)/c-family/c-cppbuiltin.c \$(srcdir)/c-family/c-pragma.h \$(srcdir)/c-family/c-pragma.c \$(srcdir)/c/c-objc-common.c \$(srcdir)/c/c-parser.h \$(srcdir)/c/c-parser.c \$(srcdir)/c/c-lang.h"
diff --git a/gcc/c/gimple-parser.c b/gcc/c/gimple-parser.c
new file mode 100644
index 0000000..7f8d948
--- /dev/null
+++ b/gcc/c/gimple-parser.c
@@ -0,0 +1,1483 @@
+/* Parser for GIMPLE.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "target.h"
+#include "function.h"
+#include "c-tree.h"
+#include "timevar.h"
+#include "stringpool.h"
+#include "cgraph.h"
+#include "attribs.h"
+#include "stor-layout.h"
+#include "varasm.h"
+#include "trans-mem.h"
+#include "c-family/c-pragma.h"
+#include "c-lang.h"
+#include "c-family/c-objc.h"
+#include "plugin.h"
+#include "omp-low.h"
+#include "builtins.h"
+#include "gomp-constants.h"
+#include "c-family/c-indentation.h"
+#include "gimple-expr.h"
+#include "context.h"
+#include "gcc-rich-location.h"
+#include "c-parser.h"
+#include "tree-vrp.h"
+#include "tree-pass.h"
+#include "tree-pretty-print.h"
+#include "tree.h"
+#include "basic-block.h"
+#include "gimple.h"
+#include "gimple-pretty-print.h"
+#include "tree-ssa.h"
+#include "pass_manager.h"
+#include "tree-ssanames.h"
+#include "gimple-ssa.h"
+#include "tree-dfa.h"
+#include "tree-dump.h"
+
+
+/* Gimple parsing functions.  */
+static bool c_parser_gimple_compound_statement (c_parser *, gimple_seq *);
+static void c_parser_gimple_label (c_parser *, gimple_seq *);
+static void c_parser_gimple_expression (c_parser *, gimple_seq *);
+static struct c_expr c_parser_gimple_binary_expression (c_parser *, enum tree_code *);
+static struct c_expr c_parser_gimple_unary_expression (c_parser *);
+static struct c_expr c_parser_gimple_postfix_expression (c_parser *);
+static struct c_expr c_parser_gimple_postfix_expression_after_primary (c_parser *,
+								       location_t,
+								       struct c_expr);
+static void c_parser_gimple_declaration (c_parser *);
+static void c_parser_gimple_goto_stmt (location_t, tree, gimple_seq *);
+static void c_parser_gimple_if_stmt (c_parser *, gimple_seq *);
+static void c_parser_gimple_switch_stmt (c_parser *, gimple_seq *);
+static void c_parser_gimple_return_stmt (c_parser *, gimple_seq *);
+static void c_finish_gimple_return (location_t, tree);
+static tree c_parser_gimple_paren_condition (c_parser *);
+static vec<tree, va_gc> *c_parser_gimple_expr_list (c_parser *,
+		    vec<tree, va_gc> **, vec<location_t> *);
+
+
+/* Parse the body of a function declaration marked with "__GIMPLE".  */
+
+void
+c_parser_parse_gimple_body (c_parser *parser)
+{
+  gimple_seq seq = NULL;
+  gimple_seq body = NULL;
+  tree stmt = push_stmt_list ();
+  push_scope ();
+  location_t loc1 = c_parser_peek_token (parser)->location;
+
+  init_tree_ssa (cfun);
+
+  if (! c_parser_gimple_compound_statement (parser, &seq))
+    {
+      gimple *ret = gimple_build_return (NULL);
+      gimple_seq_add_stmt (&seq, ret);
+    }
+
+  tree block = pop_scope ();
+  stmt = pop_stmt_list (stmt);
+  stmt = c_build_bind_expr (loc1, block, stmt);
+
+  block = DECL_INITIAL (current_function_decl);
+  BLOCK_SUBBLOCKS (block) = NULL_TREE;
+  BLOCK_CHAIN (block) = NULL_TREE;
+  TREE_ASM_WRITTEN (block) = 1;
+
+  gbind *bind_stmt = gimple_build_bind (BIND_EXPR_VARS (stmt), NULL,
+					BIND_EXPR_BLOCK (stmt));
+  gimple_bind_set_body (bind_stmt, seq);
+  gimple_seq_add_stmt (&body, bind_stmt);
+  gimple_set_body (current_function_decl, body);
+
+  /* While we have SSA names in the IL we do not have a CFG built yet
+     and PHIs are represented using a PHI internal function.  We do
+     have lowered control flow and exception handling (well, we do not
+     have parser support for EH yet).  But as we still have BINDs
+     we have to go through lowering again.  */
+  cfun->curr_properties = PROP_gimple_any;
+
+  dump_function (TDI_generic, current_function_decl);
+}
+
+/* Parse a compound statement in gimple function body.
+
+   gimple-statement:
+     gimple-statement
+     gimple-declaration-statement
+     gimple-if-statement
+     gimple-switch-statement
+     gimple-labeled-statement
+     gimple-expression-statement
+     gimple-goto-statement
+     gimple-phi-statement
+     gimple-return-statement
+*/
+
+static bool
+c_parser_gimple_compound_statement (c_parser *parser, gimple_seq *seq)
+{
+  bool return_p = false;
+
+  if (! c_parser_require (parser, CPP_OPEN_BRACE, "expected %<{%>"))
+    return false;
+
+  /* A compund statement starts with optional declarations.  */
+  while (c_parser_next_tokens_start_declaration (parser))
+    {
+      c_parser_gimple_declaration (parser);
+      if (! c_parser_require (parser, CPP_SEMICOLON, "expected %<;%>"))
+	return false;
+    }
+
+  while (c_parser_next_token_is_not (parser, CPP_CLOSE_BRACE))
+    {
+      if (c_parser_error (parser))
+	{
+	  c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, NULL);
+	  return return_p;
+	}
+      else if (c_parser_next_token_is (parser, CPP_EOF))
+	{
+	  c_parser_error (parser, "expected declaration or statement");
+	  return return_p;
+	}
+
+      switch (c_parser_peek_token (parser)->type)
+	{
+	case CPP_KEYWORD:
+	  switch (c_parser_peek_token (parser)->keyword)
+	    {
+	    case RID_IF:
+	      c_parser_gimple_if_stmt (parser, seq);
+	      break;
+	    case RID_SWITCH:
+	      c_parser_gimple_switch_stmt (parser, seq);
+	      break;
+	    case RID_GOTO:
+	      {
+		location_t loc = c_parser_peek_token (parser)->location;
+		c_parser_consume_token (parser);
+		if (c_parser_next_token_is (parser, CPP_NAME))
+		  {
+		    c_parser_gimple_goto_stmt (loc,
+					       c_parser_peek_token
+					       (parser)->value,
+					       seq);
+		    c_parser_consume_token (parser);
+		    if (! c_parser_require (parser, CPP_SEMICOLON,
+					    "expected %<;%>"))
+		      return return_p;
+		  }
+		}
+	      break;
+	    case RID_RETURN:
+	      return_p = true;
+	      c_parser_gimple_return_stmt (parser, seq);
+	      if (! c_parser_require (parser, CPP_SEMICOLON,
+				      "expected %<;%>"))
+		return return_p;
+	      break;
+	    default:
+	      goto expr_stmt;
+	    }
+	  break;
+	case CPP_NAME:
+	  if (c_parser_peek_2nd_token (parser)->type == CPP_COLON)
+	    {
+	      c_parser_gimple_label (parser, seq);
+	      break;
+	    }
+	  goto expr_stmt;
+
+	default:
+expr_stmt:
+	  c_parser_gimple_expression (parser, seq);
+	  if (! c_parser_require (parser, CPP_SEMICOLON, "expected %<;%>"))
+	    return return_p;
+	}
+    }
+  c_parser_consume_token (parser);
+  return return_p;
+}
+
+/* Parse a gimple expression.
+
+   gimple-expression:
+     gimple-unary-expression
+     gimple-call-statement
+     gimple-binary-expression
+     gimple-assign-expression
+     gimple-cast-expression
+
+*/
+
+static void
+c_parser_gimple_expression (c_parser *parser, gimple_seq *seq)
+{
+  struct c_expr lhs, rhs;
+  gimple *assign = NULL;
+  enum tree_code subcode = NOP_EXPR;
+  location_t loc;
+  tree arg = NULL_TREE;
+  auto_vec<tree> vargs;
+
+  lhs = c_parser_gimple_unary_expression (parser);
+  rhs.value = error_mark_node;
+
+  if (c_parser_next_token_is (parser, CPP_EQ))
+    c_parser_consume_token (parser);
+
+  loc = EXPR_LOCATION (lhs.value);
+
+  /* GIMPLE call expression.  */
+  if (c_parser_next_token_is (parser, CPP_SEMICOLON)
+      && TREE_CODE (lhs.value) == CALL_EXPR)
+    {
+      gimple *call;
+      call = gimple_build_call_from_tree (lhs.value);
+      gimple_seq_add_stmt (seq, call);
+      gimple_set_location (call, loc);
+      return;
+    }
+
+  /* Cast expression.  */
+  if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)
+      && c_token_starts_typename (c_parser_peek_2nd_token (parser)))
+    {
+      /* TODO: have a gimple_cast_expr function.  */
+      rhs = c_parser_cast_expression (parser, NULL);
+      if (lhs.value != error_mark_node &&
+	  rhs.value != error_mark_node)
+	{
+	  assign = gimple_build_assign (lhs.value, rhs.value);
+	  gimple_seq_add_stmt (seq, assign);
+	  gimple_set_location (assign, loc);
+	  return;
+	}
+    }
+
+  /* Pointer expression.  */
+  if (TREE_CODE (lhs.value) == INDIRECT_REF)
+    {
+      tree save_expr = lhs.value;
+      bool volatilep = TREE_THIS_VOLATILE (lhs.value);
+      bool notrap = TREE_THIS_NOTRAP (lhs.value);
+      tree saved_ptr_type = TREE_TYPE (TREE_OPERAND (lhs.value, 0));
+
+      lhs.value = fold_indirect_ref_loc (loc, lhs.value);
+      if (lhs.value == save_expr)
+	{
+	  lhs.value = fold_build2_loc (input_location, MEM_REF,
+				       TREE_TYPE (lhs.value),
+				       TREE_OPERAND (lhs.value, 0),
+				       build_int_cst (saved_ptr_type, 0));
+	  TREE_THIS_VOLATILE (lhs.value) = volatilep;
+	  TREE_THIS_NOTRAP (lhs.value) = notrap;
+	}
+    }
+
+  switch (c_parser_peek_token (parser)->type)
+    {
+    case CPP_AND:
+    case CPP_PLUS:
+    case CPP_MINUS:
+    case CPP_COMPL:
+    case CPP_NOT:
+    case CPP_MULT: /* pointer deref */
+      rhs = c_parser_gimple_unary_expression (parser);
+      assign = gimple_build_assign (lhs.value, rhs.value);
+      gimple_set_location (assign, loc);
+      gimple_seq_add_stmt (seq, assign);
+      return;
+
+    default:;
+    }
+
+  /* GIMPLE PHI expression.  */
+  if (c_parser_next_token_is_keyword (parser, RID_PHI))
+    {
+      c_parser_consume_token (parser);
+
+      if (! c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>"))
+	return;
+
+      if (c_parser_next_token_is (parser, CPP_OPEN_PAREN))
+	c_parser_consume_token (parser);
+
+      while (c_parser_next_token_is_not (parser, CPP_CLOSE_PAREN))
+	{
+	  if (c_parser_next_token_is (parser, CPP_NAME)
+	      && c_parser_peek_2nd_token (parser)->type == CPP_COLON)
+	    {
+	      arg = lookup_label_for_goto (loc,
+					   c_parser_peek_token (parser)->value);
+	      c_parser_consume_token (parser);
+
+	      if (c_parser_next_token_is (parser, CPP_COLON))
+		c_parser_consume_token (parser);
+	      vargs.safe_push (arg);
+	    }
+	  else if (c_parser_next_token_is (parser, CPP_COMMA))
+	    c_parser_consume_token (parser);
+	  else
+	    {
+	      arg = c_parser_gimple_unary_expression (parser).value;
+	      vargs.safe_push (arg);
+	    }
+	}
+
+      c_parser_skip_until_found (parser, CPP_CLOSE_PAREN,
+				 "expected %<)%>");
+
+      /* Build internal function for PHI.  */
+      gcall *call_stmt = gimple_build_call_internal_vec (IFN_PHI, vargs);
+      gimple_call_set_lhs (call_stmt, lhs.value);
+      gimple_set_location (call_stmt, UNKNOWN_LOCATION);
+      gimple_seq_add_stmt (seq, call_stmt);
+      return;
+    }
+
+  /* GIMPLE call with lhs.  */
+  if (c_parser_next_token_is (parser, CPP_NAME)
+      && c_parser_peek_2nd_token (parser)->type == CPP_OPEN_PAREN
+      && lookup_name (c_parser_peek_token (parser)->value))
+    {
+      rhs = c_parser_gimple_unary_expression (parser);
+      gimple *call = gimple_build_call_from_tree (rhs.value);
+      gimple_call_set_lhs (call, lhs.value);
+      gimple_seq_add_stmt (seq, call);
+      gimple_set_location (call, loc);
+      return;
+    }
+
+  rhs = c_parser_gimple_binary_expression (parser, &subcode);
+
+  if (lhs.value != error_mark_node
+      && rhs.value != error_mark_node)
+    {
+      if (subcode == NOP_EXPR)
+	assign = gimple_build_assign (lhs.value, rhs.value);
+      else
+	assign = gimple_build_assign (lhs.value, subcode,
+				      TREE_OPERAND (rhs.value, 0),
+				      TREE_OPERAND (rhs.value, 1));
+      gimple_seq_add_stmt (seq, assign);
+      gimple_set_location (assign, loc);
+    }
+  return;
+}
+
+/* Parse gimple binary expr.
+
+   gimple-multiplicative-expression:
+     gimple-unary-expression * gimple-unary-expression
+     gimple-unary-expression / gimple-unary-expression
+     gimple-unary-expression % gimple-unary-expression
+
+   gimple-additive-expression:
+     gimple-unary-expression + gimple-unary-expression
+     gimple-unary-expression - gimple-unary-expression
+
+   gimple-shift-expression:
+     gimple-unary-expression << gimple-unary-expression
+     gimple-unary-expression >> gimple-unary-expression
+
+   gimple-relational-expression:
+     gimple-unary-expression < gimple-unary-expression
+     gimple-unary-expression > gimple-unary-expression
+     gimple-unary-expression <= gimple-unary-expression
+     gimple-unary-expression >= gimple-unary-expression
+
+   gimple-equality-expression:
+     gimple-unary-expression == gimple-unary-expression
+     gimple-unary-expression != gimple-unary-expression
+
+   gimple-AND-expression:
+     gimple-unary-expression & gimple-unary-expression
+
+   gimple-exclusive-OR-expression:
+     gimple-unary-expression ^ gimple-unary-expression
+
+   gimple-inclusive-OR-expression:
+     gimple-unary-expression | gimple-unary-expression
+
+   gimple-logical-AND-expression:
+     gimple-unary-expression && gimple-unary-expression
+
+   gimple-logical-OR-expression:
+     gimple-unary-expression || gimple-unary-expression
+
+*/
+
+static c_expr
+c_parser_gimple_binary_expression (c_parser *parser, enum tree_code *subcode)
+{
+  struct {
+    /* The expression at this stack level.  */
+    struct c_expr expr;
+    /* The operation on its left.  */
+    enum tree_code op;
+    /* The source location of this operation.  */
+    location_t loc;
+  } stack[2];
+  int sp;
+  /* Location of the binary operator.  */
+  location_t binary_loc = UNKNOWN_LOCATION;  /* Quiet warning.  */
+#define POP								      \
+  do {									      \
+    if (sp == 1								      \
+	&& c_parser_peek_token (parser)->type == CPP_SEMICOLON		      \
+	&& (((1 << PREC_BITOR) | (1 << PREC_BITXOR) | (1 << PREC_BITAND)      \
+	       | (1 << PREC_SHIFT) | (1 << PREC_ADD) | (1 << PREC_MULT)))     \
+	&& stack[sp].op != TRUNC_MOD_EXPR				      \
+	&& stack[0].expr.value != error_mark_node			      \
+	&& stack[1].expr.value != error_mark_node)			      \
+      stack[0].expr.value						      \
+	= build2 (stack[1].op, TREE_TYPE (stack[0].expr.value),		      \
+		  stack[0].expr.value, stack[1].expr.value);		      \
+    else								      \
+      stack[sp - 1].expr = parser_build_binary_op (stack[sp].loc,	      \
+						   stack[sp].op,	      \
+						   stack[sp - 1].expr,	      \
+						   stack[sp].expr);	      \
+    sp--;								      \
+  } while (0)
+  stack[0].loc = c_parser_peek_token (parser)->location;
+  stack[0].expr = c_parser_gimple_unary_expression (parser);
+  sp = 0;
+  source_range src_range;
+  if (c_parser_error (parser))
+    goto out;
+  switch (c_parser_peek_token (parser)->type)
+    {
+    case CPP_MULT:
+      *subcode = MULT_EXPR;
+      break;
+    case CPP_DIV:
+      *subcode = TRUNC_DIV_EXPR;
+      break;
+    case CPP_MOD:
+      *subcode = TRUNC_MOD_EXPR;
+      break;
+    case CPP_PLUS:
+      *subcode = PLUS_EXPR;
+      break;
+    case CPP_MINUS:
+      *subcode = MINUS_EXPR;
+      break;
+    case CPP_LSHIFT:
+      *subcode = LSHIFT_EXPR;
+      break;
+    case CPP_RSHIFT:
+      *subcode = RSHIFT_EXPR;
+      break;
+    case CPP_LESS:
+      *subcode = LT_EXPR;
+      break;
+    case CPP_GREATER:
+      *subcode = GT_EXPR;
+      break;
+    case CPP_LESS_EQ:
+      *subcode = LE_EXPR;
+      break;
+    case CPP_GREATER_EQ:
+      *subcode = GE_EXPR;
+      break;
+    case CPP_EQ_EQ:
+      *subcode = EQ_EXPR;
+      break;
+    case CPP_NOT_EQ:
+      *subcode = NE_EXPR;
+      break;
+    case CPP_AND:
+      *subcode = BIT_AND_EXPR;
+      break;
+    case CPP_XOR:
+      *subcode = BIT_XOR_EXPR;
+      break;
+    case CPP_OR:
+      *subcode = BIT_IOR_EXPR;
+      break;
+    case CPP_AND_AND:
+      *subcode = TRUTH_ANDIF_EXPR;
+      break;
+    case CPP_OR_OR:
+      *subcode = TRUTH_ORIF_EXPR;
+      break;
+    default:
+      /* Not a binary operator, so end of the binary expression.  */
+      *subcode = NOP_EXPR;
+      goto out;
+    }
+  binary_loc = c_parser_peek_token (parser)->location;
+  c_parser_consume_token (parser);
+  switch (*subcode)
+    {
+    case TRUTH_ANDIF_EXPR:
+      src_range = stack[sp].expr.src_range;
+      stack[sp].expr.value = c_objc_common_truthvalue_conversion
+	(stack[sp].loc, default_conversion (stack[sp].expr.value));
+      set_c_expr_source_range (&stack[sp].expr, src_range);
+      break;
+    case TRUTH_ORIF_EXPR:
+      src_range = stack[sp].expr.src_range;
+      stack[sp].expr.value = c_objc_common_truthvalue_conversion
+	(stack[sp].loc, default_conversion (stack[sp].expr.value));
+      set_c_expr_source_range (&stack[sp].expr, src_range);
+      break;
+    default:
+      break;
+    }
+  sp++;
+  stack[sp].loc = binary_loc;
+  stack[sp].expr = c_parser_gimple_unary_expression (parser);
+  stack[sp].op = *subcode;
+out:
+  while (sp > 0)
+    POP;
+  return stack[0].expr;
+#undef POP
+}
+
+/* Parse gimple unary expression.
+
+   gimple-unary-expression:
+     gimple-postfix-expression
+     unary-operator cast-expression
+
+   unary-operator: one of
+     & * + - ~ !
+*/
+
+static c_expr
+c_parser_gimple_unary_expression (c_parser *parser)
+{
+  struct c_expr ret, op;
+  location_t op_loc = c_parser_peek_token (parser)->location;
+  location_t finish;
+  ret.original_code = ERROR_MARK;
+  ret.original_type = NULL;
+  switch (c_parser_peek_token (parser)->type)
+    {
+    case CPP_AND:
+      c_parser_consume_token (parser);
+      op = c_parser_cast_expression (parser, NULL);
+      mark_exp_read (op.value);
+      return parser_build_unary_op (op_loc, ADDR_EXPR, op);
+    case CPP_MULT:
+      {
+	c_parser_consume_token (parser);
+	op = c_parser_cast_expression (parser, NULL);
+	finish = op.get_finish ();
+	location_t combined_loc = make_location (op_loc, op_loc, finish);
+	ret.value = build_indirect_ref (combined_loc, op.value,
+					RO_UNARY_STAR);
+	ret.src_range.m_start = op_loc;
+	ret.src_range.m_finish = finish;
+	return ret;
+      }
+    case CPP_PLUS:
+      c_parser_consume_token (parser);
+      op = c_parser_cast_expression (parser, NULL);
+      return parser_build_unary_op (op_loc, CONVERT_EXPR, op);
+    case CPP_MINUS:
+      c_parser_consume_token (parser);
+      op = c_parser_cast_expression (parser, NULL);
+      return parser_build_unary_op (op_loc, NEGATE_EXPR, op);
+    case CPP_COMPL:
+      c_parser_consume_token (parser);
+      op = c_parser_cast_expression (parser, NULL);
+      return parser_build_unary_op (op_loc, BIT_NOT_EXPR, op);
+    case CPP_NOT:
+      c_parser_consume_token (parser);
+      op = c_parser_cast_expression (parser, NULL);
+      return parser_build_unary_op (op_loc, TRUTH_NOT_EXPR, op);
+    case CPP_KEYWORD:
+      switch (c_parser_peek_token (parser)->keyword)
+	{
+	case RID_REALPART:
+	  c_parser_consume_token (parser);
+	  op = c_parser_cast_expression (parser, NULL);
+	  return parser_build_unary_op (op_loc, REALPART_EXPR, op);
+	case RID_IMAGPART:
+	  c_parser_consume_token (parser);
+	  op = c_parser_cast_expression (parser, NULL);
+	  return parser_build_unary_op (op_loc, IMAGPART_EXPR, op);
+	default:
+	  return c_parser_gimple_postfix_expression (parser);
+	}
+    default:
+      return c_parser_gimple_postfix_expression (parser);
+    }
+}
+
+/* Decompose ID into base name (ID until ver_offset) and VERSION.  Return
+   true if ID matches a SSA name.  */
+
+static bool
+c_parser_parse_ssa_name_id (tree id, unsigned *version, unsigned *ver_offset)
+{
+  const char *token = IDENTIFIER_POINTER (id);
+  const char *var_version = strrchr (token, '_');
+  if (! var_version)
+    return false;
+
+  *ver_offset = var_version - token;
+  for (const char *p = var_version + 1; *p; ++p)
+    if (! ISDIGIT (*p))
+      return false;
+  *version = atoi (var_version + 1);
+  return *version > 0;
+}
+
+/* Get at the actual SSA name ID with VERSION starting at VER_OFFSET.
+   TYPE is the type if the SSA name is being declared.  */
+
+static tree 
+c_parser_parse_ssa_name (c_parser *parser,
+			 tree id, tree type, unsigned version,
+			 unsigned ver_offset)
+{
+  tree name = NULL_TREE;
+  const char *token = IDENTIFIER_POINTER (id);
+
+  if (ver_offset == 0)
+    {
+      /* Anonymous unnamed SSA name.  */
+      if (version < num_ssa_names)
+	name = ssa_name (version);
+      if (! name)
+	{
+	  if (! type)
+	    {
+	      c_parser_error (parser, "SSA name not declared"); 
+	      return error_mark_node;
+	    }
+	  name = make_ssa_name_fn (cfun, type, NULL, version);
+	}
+    }
+  else
+    {
+      if (version < num_ssa_names)
+	name = ssa_name (version);
+      if (! name)
+	{
+	  /* Separate var name from version.  */
+	  char *var_name = XNEWVEC (char, ver_offset + 1);
+	  memcpy (var_name, token, ver_offset);
+	  var_name[ver_offset] = '\0';
+	  /* lookup for parent decl.  */
+	  id = get_identifier (var_name);
+	  tree parent = lookup_name (id);
+	  XDELETEVEC (var_name);
+	  if (! parent)
+	    {
+	      c_parser_error (parser, "base variable or SSA name not declared"); 
+	      return error_mark_node;
+	    }
+	  if (VECTOR_TYPE_P (TREE_TYPE (parent))
+	      || TREE_CODE (TREE_TYPE (parent)) == COMPLEX_TYPE)
+	    DECL_GIMPLE_REG_P (parent) = 1;
+	  name = make_ssa_name_fn (cfun, parent,
+				   gimple_build_nop (), version);
+	}
+    }
+
+  return name;
+}
+
+/* Parse gimple postfix expression.
+
+   gimple-postfix-expression:
+     gimple-primary-expression
+     gimple-primary-xpression [ gimple-primary-expression ]
+     gimple-primary-expression ( gimple-argument-expression-list[opt] )
+     postfix-expression . identifier
+     postfix-expression -> identifier
+
+   gimple-argument-expression-list:
+     gimple-unary-expression
+     gimple-argument-expression-list , gimple-unary-expression
+
+   gimple-primary-expression:
+     identifier
+     constant
+     string-literal
+
+*/
+
+static struct c_expr
+c_parser_gimple_postfix_expression (c_parser *parser)
+{
+  struct c_expr expr;
+  location_t loc = c_parser_peek_token (parser)->location;
+  source_range tok_range = c_parser_peek_token (parser)->get_range ();
+  expr.original_code = ERROR_MARK;
+  expr.original_type = NULL;
+  switch (c_parser_peek_token (parser)->type)
+    {
+    case CPP_NUMBER:
+      expr.value = c_parser_peek_token (parser)->value;
+      set_c_expr_source_range (&expr, tok_range);
+      loc = c_parser_peek_token (parser)->location;
+      c_parser_consume_token (parser);
+      break;
+    case CPP_CHAR:
+    case CPP_CHAR16:
+    case CPP_CHAR32:
+    case CPP_WCHAR:
+      expr.value = c_parser_peek_token (parser)->value;
+      set_c_expr_source_range (&expr, tok_range);
+      c_parser_consume_token (parser);
+      break;
+    case CPP_STRING:
+    case CPP_STRING16:
+    case CPP_STRING32:
+    case CPP_WSTRING:
+    case CPP_UTF8STRING:
+      expr.value = c_parser_peek_token (parser)->value;
+      set_c_expr_source_range (&expr, tok_range);
+      expr.original_code = STRING_CST;
+      c_parser_consume_token (parser);
+      break;
+    case CPP_NAME:
+      if (c_parser_peek_token (parser)->id_kind == C_ID_ID)
+	{
+	  tree id = c_parser_peek_token (parser)->value;
+	  unsigned version, ver_offset;
+	  if (! lookup_name (id)
+	      && c_parser_parse_ssa_name_id (id, &version, &ver_offset))
+	    {
+	      c_parser_consume_token (parser);
+	      expr.value = c_parser_parse_ssa_name (parser, id, NULL_TREE,
+						    version, ver_offset);
+	      /* For default definition SSA names.  */
+	      if (c_parser_next_token_is (parser, CPP_OPEN_PAREN)
+		  && c_parser_peek_2nd_token (parser)->type == CPP_NAME
+		  && strcmp ("D",
+			     IDENTIFIER_POINTER
+			       (c_parser_peek_2nd_token (parser)->value)) == 0
+		  && c_parser_peek_nth_token (parser, 3)->type == CPP_CLOSE_PAREN)
+		{
+		  c_parser_consume_token (parser);
+		  c_parser_consume_token (parser);
+		  c_parser_consume_token (parser);
+		  if (! SSA_NAME_IS_DEFAULT_DEF (expr.value))
+		    {
+		      set_ssa_default_def (cfun, SSA_NAME_VAR (expr.value),
+					   expr.value);
+		      SSA_NAME_DEF_STMT (expr.value) = gimple_build_nop ();
+		    }
+		}
+	    }
+	  else
+	    {
+	      c_parser_consume_token (parser);
+	      expr.value
+		= build_external_ref (loc, id,
+				      (c_parser_peek_token (parser)->type
+				       == CPP_OPEN_PAREN), &expr.original_type);
+	      set_c_expr_source_range (&expr, tok_range);
+	    }
+	  break;
+	}
+      else
+	{
+	  c_parser_error (parser, "expected expression");
+	  expr.set_error ();
+	  break;
+	}
+      break;
+    default:
+      c_parser_error (parser, "expected expression");
+      expr.set_error ();
+      break;
+    }
+  return c_parser_gimple_postfix_expression_after_primary
+    (parser, EXPR_LOC_OR_LOC (expr.value, loc), expr);
+}
+
+/* Parse a gimple postfix expression after the initial primary or compound
+   literal.  */
+
+static struct c_expr
+c_parser_gimple_postfix_expression_after_primary (c_parser *parser,
+						  location_t expr_loc,
+						  struct c_expr expr)
+{
+  struct c_expr orig_expr;
+  vec<tree, va_gc> *exprlist;
+  vec<tree, va_gc> *origtypes = NULL;
+  vec<location_t> arg_loc = vNULL;
+  location_t start;
+  location_t finish;
+  tree ident;
+  location_t comp_loc;
+
+  while (true)
+    {
+      location_t op_loc = c_parser_peek_token (parser)->location;
+      switch (c_parser_peek_token (parser)->type)
+	{
+	case CPP_OPEN_SQUARE:
+	  {
+	    c_parser_consume_token (parser);
+	    tree idx = c_parser_gimple_unary_expression (parser).value;
+
+	    if (! c_parser_require (parser, CPP_CLOSE_SQUARE, "expected %<]%>"))
+	      break;
+
+	    start = expr.get_start ();
+	    finish = c_parser_tokens_buf (parser, 0)->location;
+	    expr.value = build_array_ref (op_loc, expr.value, idx);
+	    set_c_expr_source_range (&expr, start, finish);
+
+	    expr.original_code = ERROR_MARK;
+	    expr.original_type = NULL;
+	    break;
+	  }
+	case CPP_OPEN_PAREN:
+	  {
+	    /* Function call.  */
+	    c_parser_consume_token (parser);
+	    if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
+	      exprlist = NULL;
+	    else
+	      exprlist = c_parser_gimple_expr_list (parser, &origtypes,
+						    &arg_loc);
+	    c_parser_skip_until_found (parser, CPP_CLOSE_PAREN,
+				       "expected %<)%>");
+	    orig_expr = expr;
+	    start = expr.get_start ();
+	    finish = c_parser_tokens_buf (parser, 0)->get_finish ();
+	    expr.value = c_build_function_call_vec (expr_loc, arg_loc,
+						    expr.value,
+						    exprlist, origtypes);
+	    set_c_expr_source_range (&expr, start, finish);
+
+	    expr.original_code = ERROR_MARK;
+	    if (TREE_CODE (expr.value) == INTEGER_CST
+		&& TREE_CODE (orig_expr.value) == FUNCTION_DECL
+		&& DECL_BUILT_IN_CLASS (orig_expr.value) == BUILT_IN_NORMAL
+		&& DECL_FUNCTION_CODE (orig_expr.value) == BUILT_IN_CONSTANT_P)
+	      expr.original_code = C_MAYBE_CONST_EXPR;
+	    expr.original_type = NULL;
+	    if (exprlist)
+	      {
+		release_tree_vector (exprlist);
+		release_tree_vector (origtypes);
+	      }
+	    arg_loc.release ();
+	    break;
+	  }
+	case CPP_DOT:
+	  {
+	    /* Structure element reference.  */
+	    c_parser_consume_token (parser);
+	    if (c_parser_next_token_is (parser, CPP_NAME))
+	      {
+		c_token *comp_tok = c_parser_peek_token (parser);
+		ident = comp_tok->value;
+		comp_loc = comp_tok->location;
+	      }
+	    else
+	      {
+		c_parser_error (parser, "expected identifier");
+		expr.set_error ();
+		expr.original_code = ERROR_MARK;
+		expr.original_type = NULL;
+		return expr;
+	      }
+	    start = expr.get_start ();
+	    finish = c_parser_peek_token (parser)->get_finish ();
+	    c_parser_consume_token (parser);
+	    expr.value = build_component_ref (op_loc, expr.value, ident,
+					      comp_loc);
+	    set_c_expr_source_range (&expr, start, finish);
+	    expr.original_code = ERROR_MARK;
+	    if (TREE_CODE (expr.value) != COMPONENT_REF)
+	      expr.original_type = NULL;
+	    else
+	      {
+		/* Remember the original type of a bitfield.  */
+		tree field = TREE_OPERAND (expr.value, 1);
+		if (TREE_CODE (field) != FIELD_DECL)
+		  expr.original_type = NULL;
+		else
+		  expr.original_type = DECL_BIT_FIELD_TYPE (field);
+	      }
+	    break;
+	  }
+	case CPP_DEREF:
+	  {
+	    /* Structure element reference.  */
+	    c_parser_consume_token (parser);
+	    if (c_parser_next_token_is (parser, CPP_NAME))
+	      {
+		c_token *comp_tok = c_parser_peek_token (parser);
+		ident = comp_tok->value;
+		comp_loc = comp_tok->location;
+	      }
+	    else
+	      {
+		c_parser_error (parser, "expected identifier");
+		expr.set_error ();
+		expr.original_code = ERROR_MARK;
+		expr.original_type = NULL;
+		return expr;
+	      }
+	    start = expr.get_start ();
+	    finish = c_parser_peek_token (parser)->get_finish ();
+	    c_parser_consume_token (parser);
+	    expr.value = build_component_ref (op_loc,
+					      build_simple_mem_ref_loc
+					        (op_loc, expr.value),
+					      ident, comp_loc);
+	    set_c_expr_source_range (&expr, start, finish);
+	    expr.original_code = ERROR_MARK;
+	    if (TREE_CODE (expr.value) != COMPONENT_REF)
+	      expr.original_type = NULL;
+	    else
+	      {
+		/* Remember the original type of a bitfield.  */
+		tree field = TREE_OPERAND (expr.value, 1);
+		if (TREE_CODE (field) != FIELD_DECL)
+		  expr.original_type = NULL;
+		else
+		  expr.original_type = DECL_BIT_FIELD_TYPE (field);
+	      }
+	    break;
+	  }
+	default:
+	  return expr;
+	}
+    }
+}
+
+/* Parse expression list.
+
+   gimple-expr-list:
+     gimple-unary-expression
+     gimple-expr-list , gimple-unary-expression
+
+ */
+
+static vec<tree, va_gc> *
+c_parser_gimple_expr_list (c_parser *parser, vec<tree, va_gc> **p_orig_types,
+			   vec<location_t> *locations)
+{
+  vec<tree, va_gc> *ret;
+  vec<tree, va_gc> *orig_types;
+  struct c_expr expr;
+  location_t loc = c_parser_peek_token (parser)->location;
+
+  ret = make_tree_vector ();
+  if (p_orig_types == NULL)
+    orig_types = NULL;
+  else
+    orig_types = make_tree_vector ();
+
+  expr = c_parser_gimple_unary_expression (parser);
+  vec_safe_push (ret, expr.value);
+  if (orig_types)
+    vec_safe_push (orig_types, expr.original_type);
+  if (locations)
+    locations->safe_push (loc);
+  while (c_parser_next_token_is (parser, CPP_COMMA))
+    {
+      c_parser_consume_token (parser);
+      loc = c_parser_peek_token (parser)->location;
+      expr = c_parser_gimple_unary_expression (parser);
+      vec_safe_push (ret, expr.value);
+      if (orig_types)
+	vec_safe_push (orig_types, expr.original_type);
+      if (locations)
+	locations->safe_push (loc);
+    }
+  if (orig_types)
+    *p_orig_types = orig_types;
+  return ret;
+}
+
+/* Parse gimple label.
+
+   gimple-label:
+     identifier :
+     case constant-expression :
+     default :
+
+*/
+
+static void
+c_parser_gimple_label (c_parser *parser, gimple_seq *seq)
+{
+  tree name = c_parser_peek_token (parser)->value;
+  location_t loc1 = c_parser_peek_token (parser)->location;
+  gcc_assert (c_parser_next_token_is (parser, CPP_NAME));
+  c_parser_consume_token (parser);
+  gcc_assert (c_parser_next_token_is (parser, CPP_COLON));
+  c_parser_consume_token (parser);
+  tree label = define_label (loc1, name);
+  gimple_seq_add_stmt (seq, gimple_build_label (label));
+  return;
+}
+
+/* Parse gimple pass list.
+
+   gimple-pass-list:
+     startwith("pass-name")
+ */
+
+char *
+c_parser_gimple_pass_list (c_parser *parser)
+{
+  char *pass = NULL;
+
+  /* Accept __GIMPLE.  */
+  if (c_parser_next_token_is_not (parser, CPP_OPEN_PAREN))
+    return NULL;
+  c_parser_consume_token (parser);
+
+  if (c_parser_next_token_is (parser, CPP_NAME))
+    {
+      const char *op = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value);
+      c_parser_consume_token (parser);
+      if (! strcmp (op, "startwith"))
+	{
+	  if (! c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>"))
+	    return NULL;
+	  if (c_parser_next_token_is_not (parser, CPP_STRING))
+	    {
+	      error_at (c_parser_peek_token (parser)->location,
+			"expected pass name");
+	      return NULL;
+	    }
+	  pass = xstrdup (TREE_STRING_POINTER
+				(c_parser_peek_token (parser)->value));
+	  c_parser_consume_token (parser);
+	  if (! c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>"))
+	    return NULL;
+	}
+      else
+	{
+	  error_at (c_parser_peek_token (parser)->location,
+		    "invalid operation");
+	  return NULL;
+	}
+    }
+
+  if (! c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>"))
+    return NULL;
+
+  return pass;
+}
+
+/* Parse gimple local declaration.
+
+   declaration-specifiers:
+     storage-class-specifier declaration-specifiers[opt]
+     type-specifier declaration-specifiers[opt]
+     type-qualifier declaration-specifiers[opt]
+     function-specifier declaration-specifiers[opt]
+     alignment-specifier declaration-specifiers[opt]
+
+   storage-class-specifier:
+     typedef
+     extern
+     static
+     auto
+     register
+
+   type-specifier:
+     void
+     char
+     short
+     int
+     long
+     float
+     double
+     signed
+     unsigned
+     _Bool
+     _Complex
+
+   type-qualifier:
+     const
+     restrict
+     volatile
+     address-space-qualifier
+     _Atomic
+
+ */
+
+static void
+c_parser_gimple_declaration (c_parser *parser)
+{
+  struct c_declarator *declarator;
+  struct c_declspecs *specs = build_null_declspecs ();
+  c_parser_declspecs (parser, specs, true, true, true,
+		      true, true, cla_nonabstract_decl);
+  finish_declspecs (specs);
+
+  /* Provide better error recovery.  Note that a type name here is usually
+     better diagnosed as a redeclaration.  */
+  if (c_parser_next_token_starts_declspecs (parser)
+      && ! c_parser_next_token_is (parser, CPP_NAME))
+    {
+      c_parser_error (parser, "expected %<;%>");
+      c_parser_set_error (parser, false);
+      return;
+    }
+
+  bool dummy = false;
+  declarator = c_parser_declarator (parser,
+				    specs->typespec_kind != ctsk_none,
+				    C_DTR_NORMAL, &dummy);
+
+  if (c_parser_next_token_is (parser, CPP_SEMICOLON))
+    {
+      /* Handle SSA name decls specially, they do not go into the identifier
+         table but we simply build the SSA name for later lookup.  */
+      unsigned version, ver_offset;
+      if (declarator->kind == cdk_id
+	  && is_gimple_reg_type (specs->type)
+	  && c_parser_parse_ssa_name_id (declarator->u.id,
+					 &version, &ver_offset)
+	  /* The following restricts it to unnamed anonymous SSA names
+	     which fails parsing of named ones in dumps (we could
+	     decide to not dump their name for -gimple).  */
+	  && ver_offset == 0)
+	c_parser_parse_ssa_name (parser, declarator->u.id, specs->type,
+				 version, ver_offset);
+      else
+	{
+	  tree postfix_attrs = NULL_TREE;
+	  tree all_prefix_attrs = specs->attrs;
+	  specs->attrs = NULL;
+	  tree decl = start_decl (declarator, specs, false,
+				  chainon (postfix_attrs, all_prefix_attrs));
+	  if (decl)
+	    finish_decl (decl, UNKNOWN_LOCATION, NULL_TREE, NULL_TREE,
+			 NULL_TREE);
+	}
+    }
+  else
+    {
+      c_parser_error (parser, "expected %<;%>");
+      return;
+    }
+}
+
+/* Parse gimple goto statement.  */
+
+static void
+c_parser_gimple_goto_stmt (location_t loc, tree label, gimple_seq *seq)
+{
+  tree decl = lookup_label_for_goto (loc, label);
+  gimple_seq_add_stmt (seq, gimple_build_goto (decl));
+  return;
+}
+
+/* Parse a parenthesized condition.
+   gimple-condition:
+     ( gimple-binary-expression )    */
+
+static tree
+c_parser_gimple_paren_condition (c_parser *parser)
+{
+  enum tree_code subcode = NOP_EXPR;
+  location_t loc = c_parser_peek_token (parser)->location;
+  if (! c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>"))
+    return error_mark_node;
+  tree cond = c_parser_gimple_binary_expression (parser, &subcode).value;
+  cond = c_objc_common_truthvalue_conversion (loc, cond);
+  if (! c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>"))
+    return error_mark_node;
+  return cond;
+}
+
+/* Parse gimple if-else statement.
+
+   if-statement:
+     if ( gimple-binary-expression ) gimple-goto-statement
+     if ( gimple-binary-expression ) gimple-goto-statement \
+					else gimple-goto-statement
+ */
+
+static void
+c_parser_gimple_if_stmt (c_parser *parser, gimple_seq *seq)
+{
+  tree t_label, f_label, label;
+  location_t loc;
+  c_parser_consume_token (parser);
+  tree cond = c_parser_gimple_paren_condition (parser);
+
+  if (c_parser_next_token_is_keyword (parser, RID_GOTO))
+    {
+      loc = c_parser_peek_token (parser)->location;
+      c_parser_consume_token (parser);
+      label = c_parser_peek_token (parser)->value;
+      t_label = lookup_label_for_goto (loc, label);
+      c_parser_consume_token (parser);
+      if (! c_parser_require (parser, CPP_SEMICOLON, "expected %<;%>"))
+	return;
+    }
+  else
+    {
+      c_parser_error (parser, "expected goto expression");
+      return;
+    }
+
+  if (c_parser_next_token_is_keyword (parser, RID_ELSE))
+    c_parser_consume_token (parser);
+  else
+    {
+      c_parser_error (parser, "expected else statement");
+      return;
+    }
+
+  if (c_parser_next_token_is_keyword (parser, RID_GOTO))
+    {
+      loc = c_parser_peek_token (parser)->location;
+      c_parser_consume_token (parser);
+      label = c_parser_peek_token (parser)->value;
+      f_label = lookup_label_for_goto (loc, label);
+      c_parser_consume_token (parser);
+      if (! c_parser_require (parser, CPP_SEMICOLON, "expected %<;%>"))
+	return;
+    }
+  else
+    {
+      c_parser_error (parser, "expected goto expression");
+      return;
+    }
+
+  gimple_seq_add_stmt (seq, gimple_build_cond_from_tree (cond, t_label,
+							 f_label));
+}
+
+/* Parse gimple switch-statement.
+
+   gimple-switch-statement:
+     switch (gimple-unary-expression) gimple-case-statement
+
+   gimple-case-statement:
+     gimple-case-statement
+     gimple-label-statement : gimple-goto-statment
+*/
+
+static void
+c_parser_gimple_switch_stmt (c_parser *parser, gimple_seq *seq)
+{
+  c_expr cond_expr;
+  tree case_label, label;
+  auto_vec<tree> labels;
+  tree default_label = NULL_TREE;
+  gimple_seq switch_body = NULL;
+  c_parser_consume_token (parser);
+
+  if (c_parser_require (parser, CPP_OPEN_PAREN, "expected %<(%>"))
+    {
+      cond_expr = c_parser_gimple_unary_expression (parser);
+      if (! c_parser_require (parser, CPP_CLOSE_PAREN, "expected %<)%>"))
+	return;
+    }
+
+  if (c_parser_require (parser, CPP_OPEN_BRACE, "expected %<{%>"))
+    {
+      while (c_parser_next_token_is_not (parser, CPP_CLOSE_BRACE))
+	{
+	  if (c_parser_next_token_is (parser, CPP_EOF))
+	    {
+	      c_parser_error (parser, "expected statement");
+	      return;
+	    }
+
+	  switch (c_parser_peek_token (parser)->keyword)
+	    {
+	    case RID_CASE:
+	      {
+		c_expr exp1;
+		location_t loc = c_parser_peek_token (parser)->location;
+		c_parser_consume_token (parser);
+
+		if (c_parser_next_token_is (parser, CPP_NAME)
+		    || c_parser_peek_token (parser)->type == CPP_NUMBER)
+		  exp1 = c_parser_gimple_unary_expression (parser);
+		else
+		  c_parser_error (parser, "expected expression");
+
+		if (c_parser_next_token_is (parser, CPP_COLON))
+		  {
+		    c_parser_consume_token (parser);
+		    if (c_parser_next_token_is (parser, CPP_NAME))
+		      {
+			label = c_parser_peek_token (parser)->value;
+			c_parser_consume_token (parser);
+			tree decl = lookup_label_for_goto (loc, label);
+			case_label = build_case_label (exp1.value, NULL_TREE,
+						       decl);
+			labels.safe_push (case_label);
+			if (! c_parser_require (parser, CPP_SEMICOLON,
+						"expected %<;%>"))
+			  return;
+		      }
+		    else if (! c_parser_require (parser, CPP_NAME,
+						 "expected label"))
+		      return;
+		  }
+		else if (! c_parser_require (parser, CPP_SEMICOLON,
+					    "expected %<:%>"))
+		  return;
+		break;
+	      }
+	    case RID_DEFAULT:
+	      {
+		location_t loc = c_parser_peek_token (parser)->location;
+		c_parser_consume_token (parser);
+		if (c_parser_next_token_is (parser, CPP_COLON))
+		  {
+		    c_parser_consume_token (parser);
+		    if (c_parser_next_token_is (parser, CPP_NAME))
+		      {
+			label = c_parser_peek_token (parser)->value;
+			c_parser_consume_token (parser);
+			tree decl = lookup_label_for_goto (loc, label);
+			default_label = build_case_label (NULL_TREE, NULL_TREE,
+							  decl);
+			if (! c_parser_require (parser, CPP_SEMICOLON,
+						"expected %<;%>"))
+			  return;
+		      }
+		    else if (! c_parser_require (parser, CPP_NAME,
+						 "expected label"))
+		      return;
+		  }
+		else if (! c_parser_require (parser, CPP_SEMICOLON,
+					    "expected %<:%>"))
+		  return;
+		break;
+	      }
+	    case RID_GOTO:
+	      {
+		location_t loc = c_parser_peek_token (parser)->location;
+		c_parser_consume_token (parser);
+		if (c_parser_next_token_is (parser, CPP_NAME))
+		  {
+		    c_parser_gimple_goto_stmt (loc,
+					       c_parser_peek_token
+					         (parser)->value,
+					       &switch_body);
+		    c_parser_consume_token (parser);
+		    if (c_parser_next_token_is (parser, CPP_SEMICOLON))
+		      c_parser_consume_token (parser);
+		    else
+		      {
+			c_parser_error (parser, "expected semicolon");
+			return;
+		      }
+		  }
+		else if (! c_parser_require (parser, CPP_NAME,
+					    "expected label"))
+		  return;
+		break;
+	      }
+	    default:
+	      c_parser_error (parser, "expected case label or goto statement");
+	      return;
+	    }
+
+	}
+    }
+  if (! c_parser_require (parser, CPP_CLOSE_BRACE, "expected %<}%>"))
+    return;
+  gimple_seq_add_stmt (seq, gimple_build_switch (cond_expr.value,
+						 default_label, labels));
+  gimple_seq_add_seq (seq, switch_body);
+  labels.release();
+}
+
+/* Parse gimple return statement.  */
+
+static void
+c_parser_gimple_return_stmt (c_parser *parser, gimple_seq *seq)
+{
+  location_t loc = c_parser_peek_token (parser)->location;
+  gimple *ret = NULL;
+  c_parser_consume_token (parser);
+  if (c_parser_next_token_is (parser, CPP_SEMICOLON))
+    {
+      c_finish_gimple_return (loc, NULL_TREE);
+      ret = gimple_build_return (NULL);
+      gimple_seq_add_stmt (seq, ret);
+    }
+  else
+    {
+      location_t xloc = c_parser_peek_token (parser)->location;
+      c_expr expr = c_parser_gimple_unary_expression (parser);
+      c_finish_gimple_return (xloc, expr.value);
+      ret = gimple_build_return (expr.value);
+      gimple_seq_add_stmt (seq, ret);
+    }
+}
+
+/* Support function for c_parser_gimple_return_stmt.  */
+
+static void
+c_finish_gimple_return (location_t loc, tree retval)
+{
+  tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl));
+
+  /* Use the expansion point to handle cases such as returning NULL
+     in a function returning void.  */
+  source_location xloc = expansion_point_location_if_in_system_header (loc);
+
+  if (TREE_THIS_VOLATILE (current_function_decl))
+    warning_at (xloc, 0,
+		"function declared %<noreturn%> has a %<return%> statement");
+
+  if (! retval)
+    current_function_returns_null = 1;
+  else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
+    {
+      current_function_returns_null = 1;
+      if (TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
+	{
+	  error_at
+	    (xloc, "%<return%> with a value, in function returning void");
+	  inform (DECL_SOURCE_LOCATION (current_function_decl),
+		  "declared here");
+	}
+    }
+  else if (TREE_CODE (valtype) != TREE_CODE (TREE_TYPE (retval)))
+    {
+      error_at
+	(xloc, "invalid conversion in return statement");
+      inform (DECL_SOURCE_LOCATION (current_function_decl),
+	      "declared here");
+    }
+  return;
+}
diff --git a/gcc/c/gimple-parser.h b/gcc/c/gimple-parser.h
new file mode 100644
index 0000000..f72b626
--- /dev/null
+++ b/gcc/c/gimple-parser.h
@@ -0,0 +1,27 @@
+/* Declarations for the parser for GIMPLE.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GIMPLE_PARSER_H
+#define GCC_GIMPLE_PARSER_H
+
+/* Gimple parsing functions.  */
+extern void c_parser_parse_gimple_body (c_parser *);
+extern char *c_parser_gimple_pass_list (c_parser *);
+
+#endif
diff --git a/gcc/objc/config-lang.in b/gcc/objc/config-lang.in
index f5a74a7..912af22 100644
--- a/gcc/objc/config-lang.in
+++ b/gcc/objc/config-lang.in
@@ -35,4 +35,4 @@ lang_requires="c"
 # Order is important.  If you change this list, make sure you test
 # building without C++ as well; that is, remove the gcc/cp directory,
 # and build with --enable-languages=c,objc.
-gtfiles="\$(srcdir)/objc/objc-map.h \$(srcdir)/c-family/c-objc.h \$(srcdir)/objc/objc-act.h \$(srcdir)/objc/objc-act.c \$(srcdir)/objc/objc-runtime-shared-support.c \$(srcdir)/objc/objc-gnu-runtime-abi-01.c \$(srcdir)/objc/objc-next-runtime-abi-01.c \$(srcdir)/objc/objc-next-runtime-abi-02.c \$(srcdir)/c/c-parser.c \$(srcdir)/c/c-tree.h \$(srcdir)/c/c-decl.c \$(srcdir)/c/c-lang.h \$(srcdir)/c/c-objc-common.c \$(srcdir)/c-family/c-common.c \$(srcdir)/c-family/c-common.h \$(srcdir)/c-family/c-cppbuiltin.c \$(srcdir)/c-family/c-pragma.h \$(srcdir)/c-family/c-pragma.c"
+gtfiles="\$(srcdir)/objc/objc-map.h \$(srcdir)/c-family/c-objc.h \$(srcdir)/objc/objc-act.h \$(srcdir)/objc/objc-act.c \$(srcdir)/objc/objc-runtime-shared-support.c \$(srcdir)/objc/objc-gnu-runtime-abi-01.c \$(srcdir)/objc/objc-next-runtime-abi-01.c \$(srcdir)/objc/objc-next-runtime-abi-02.c \$(srcdir)/c/c-parser.h \$(srcdir)/c/c-parser.c \$(srcdir)/c/c-tree.h \$(srcdir)/c/c-decl.c \$(srcdir)/c/c-lang.h \$(srcdir)/c/c-objc-common.c \$(srcdir)/c-family/c-common.c \$(srcdir)/c-family/c-common.h \$(srcdir)/c-family/c-cppbuiltin.c \$(srcdir)/c-family/c-pragma.h \$(srcdir)/c-family/c-pragma.c"

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 5ccd424..e0517b6 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -179,7 +179,7 @@ in the following sections.
 @xref{C Dialect Options,,Options Controlling C Dialect}.
 @gccoptlist{-ansi  -std=@var{standard}  -fgnu89-inline @gol
 -aux-info @var{filename} -fallow-parameterless-variadic-functions @gol
--fno-asm  -fno-builtin  -fno-builtin-@var{function} @gol
+-fno-asm  -fno-builtin  -fno-builtin-@var{function} -fgimple@gol
 -fhosted  -ffreestanding -fopenacc -fopenmp -fopenmp-simd @gol
 -fms-extensions -fplan9-extensions -fsso-struct=@var{endianness}
 -fallow-single-precision  -fcond-mismatch -flax-vector-conversions @gol
@@ -1948,6 +1948,13 @@ built-in functions selectively when using @option{-fno-builtin} or
 #define strcpy(d, s)    __builtin_strcpy ((d), (s))
 @end smallexample
 
+@item -fgimple
+@opindex fgimple
+
+Enable parsing of function definitions marked with @code{__GIMPLE}.
+This is an experimental feature that allows unit testing of GIMPLE
+passes.
+
 @item -fhosted
 @opindex fhosted
 @cindex hosted environment



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