[PATCH 4/6] diagnostics: libcpp: Add LC_GEN linemaps to support in-memory buffers

Lewis Hyatt lhyatt@gmail.com
Thu Nov 17 21:21:15 GMT 2022


On Sat, Nov 05, 2022 at 12:23:28PM -0400, David Malcolm wrote:
> On Fri, 2022-11-04 at 09:44 -0400, Lewis Hyatt via Gcc-patches wrote:
> [...snip...]
> > 
> > diff --git a/gcc/c-family/c-common.cc b/gcc/c-family/c-common.cc
> > index 5890c18bdc3..2935d7fb236 100644
> > --- a/gcc/c-family/c-common.cc
> > +++ b/gcc/c-family/c-common.cc
> > @@ -9183,11 +9183,14 @@ try_to_locate_new_include_insertion_point (const char *file, location_t loc)
> >        const line_map_ordinary *ord_map
> >         = LINEMAPS_ORDINARY_MAP_AT (line_table, i);
> >  
> > +      if (ord_map->reason == LC_GEN)
> > +       continue;
> > +
> >        if (const line_map_ordinary *from
> >           = linemap_included_from_linemap (line_table, ord_map))
> >         /* We cannot use pointer equality, because with preprocessed
> >            input all filename strings are unique.  */
> > -       if (0 == strcmp (from->to_file, file))
> > +       if (from->reason != LC_GEN && 0 == strcmp (from->to_file, file))
> >           {
> >             last_include_ord_map = from;
> >             last_ord_map_after_include = NULL;
> 
> [...snip...]
> 
> I'm not a fan of having the "to_file" field change meaning based on
> whether reason is LC_GEN.
> 
> How involved would it be to split line_map_ordinary into two
> subclasses, so that we'd have this hierarchy (with indentation showing
> inheritance):
> 
> line_map
>   line_map_ordinary
>     line_map_ordinary_file
>     line_map_ordinary_generated
>   line_map_macro
> 
> Alternatively, how about renaming "to_file" to be "data" (or "m_data"),
> to emphasize that it might not be a filename, and that we have to check
> everywhere we access that field.
> 
> Please can all those checks for LC_GEN go into an inline function so we
> can write e.g.
>   map->generated_p ()
> or somesuch.
> 
> If I reading things right, patch 6 adds the sole usage of this in
> destringize_and_run.  Would we ever want to discriminate between
> different kinds of generated buffers?
> 
> [...snip...]
> 
> > @@ -796,10 +798,13 @@ diagnostic_report_current_module (diagnostic_context *context, location_t where)
> >                  N_("of module"),
> >                  N_("In module imported at"),   /* 6 */
> >                  N_("imported at"),
> > +                N_("In buffer generated from"),   /* 8 */
> >                 };
> 
> We use the wording "destringized" in:
> 
> so maybe this should be "In buffer destringized from" ???  (I'm not
> sure) 
> 
> [...snip...]
> 
> > diff --git a/gcc/input.cc b/gcc/input.cc
> > index 483cb6e940d..3cf5480551d 100644
> > --- a/gcc/input.cc
> > +++ b/gcc/input.cc
> 
> [..snip...]
> 
> > @@ -58,7 +64,7 @@ public:
> >    ~file_cache_slot ();
> 
> My initial thought reading the input.cc part of this patch was that I
> want it to be very clear when a file_cache_slot is for a real file vs
> when we're replaying generated data.  I'd hoped that this could have
> been expressed via inheritance, but we preallocate all the cache slots
> once in an array in file_cache's ctor and the slots get reused over
> time.  So instead of that, can we please have some kind of:
> 
>    bool file_slot_p () const;
>    bool generated_slot_p () const;
> 
> or somesuch, so that we can have clear assertions and conditionals
> about the current state of a slot (I think the discriminating condition
> is that generated_data_len > 0, right?)
> 
> If I'm reading things right, it looks like file_cache_slot::m_file_path
> does double duty after this patch, and is either a filename, or a
> pointer to the generated data.  If so, please can the patch rename it,
> and have all usage guarded appropriately.  Can it be a union? (or does
> the ctor prevent that?)
> 
> [...snip...]
>  
> > @@ -445,16 +461,23 @@ file_cache::evicted_cache_tab_entry (unsigned *highest_use_count)
> >     num_file_slots files are cached.  */
> >  
> >  file_cache_slot*
> > -file_cache::add_file (const char *file_path)
> > +file_cache::add_file (const char *file_path, unsigned int generated_data_len)
> 
> Can we split this into two functions: one for files, and one for
> generated data?  (add_file vs add_generated_data?)
> 
> >  {
> >  
> > -  FILE *fp = fopen (file_path, "r");
> > -  if (fp == NULL)
> > -    return NULL;
> > +  FILE *fp;
> > +  if (generated_data_len)
> > +    fp = NULL;
> > +  else
> > +    {
> > +      fp = fopen (file_path, "r");
> > +      if (fp == NULL)
> > +       return NULL;
> > +    }
> >  
> >    unsigned highest_use_count = 0;
> >    file_cache_slot *r = evicted_cache_tab_entry (&highest_use_count);
> > -  if (!r->create (in_context, file_path, fp, highest_use_count))
> > +  if (!r->create (in_context, file_path, fp, highest_use_count,
> > +                 generated_data_len))
> >      return NULL;
> >    return r;
> >  }
> 
> [...snip...]
> 
> > @@ -535,11 +571,12 @@ file_cache::~file_cache ()
> >     it.  */
> >  
> >  file_cache_slot*
> > -file_cache::lookup_or_add_file (const char *file_path)
> > +file_cache::lookup_or_add_file (const char *file_path,
> > +                               unsigned int generated_data_len)
> 
> Likewise, could this be split into:
>   lookup_or_add_file
> and
>   lookup_or_add_generated
> or somesuch?
> 
> >  {
> >    file_cache_slot *r = lookup_file (file_path);
> 
> The patch doesn't seem to touch file_cache::lookup_file.  Is the
> current implementation of that ideal (it looks like we're going to be
> doing strcmp of generated buffers, when presumably for those we could
> simply be doing pointer comparisons).
> 
> Maybe rename it to lookup_slot?
> 
> >    if (r == NULL)
> > -    r = add_file (file_path);
> > +    r = add_file (file_path, generated_data_len);
> >    return r;
> >  }
> >  
> > @@ -547,7 +584,8 @@ file_cache::lookup_or_add_file (const char *file_path)
> >     diagnostic.  */
> >  
> >  file_cache_slot::file_cache_slot ()
> > -: m_use_count (0), m_file_path (NULL), m_fp (NULL), m_data (0),
> > +: m_use_count (0), m_file_path (NULL), m_fp (NULL),
> > +  m_data (0), m_data_active (0),
> >    m_alloc_offset (0), m_size (0), m_nb_read (0), m_line_start_idx (0),
> >    m_line_num (0), m_total_lines (0), m_missing_trailing_newline (true)
> >  {
> 
> [...snip...]
> 
> 
> 
> > diff --git a/libcpp/include/line-map.h b/libcpp/include/line-map.h
> > index 50207cacc12..eb281809cbd 100644
> > --- a/libcpp/include/line-map.h
> > +++ b/libcpp/include/line-map.h
> > @@ -75,6 +75,8 @@ enum lc_reason
> >    LC_RENAME_VERBATIM,  /* Likewise, but "" != stdin.  */
> >    LC_ENTER_MACRO,      /* Begin macro expansion.  */
> >    LC_MODULE,           /* A (C++) Module.  */
> > +  LC_GEN,              /* Internally generated source.  */
> > +
> >    /* FIXME: add support for stringize and paste.  */
> >    LC_HWM /* High Water Mark.  */
> >  };
> > @@ -437,7 +439,11 @@ struct GTY((tag ("1"))) line_map_ordinary : public line_map {
> >  
> >    /* Pointer alignment boundary on both 32 and 64-bit systems.  */
> >  
> > -  const char *to_file;
> > +  /* This GTY markup is in case this is an LC_GEN map, in which case
> > +     to_file actually points to the generated data, which we do not
> > +     want to require to be free of null bytes.  */
> > +  const char * GTY((string_length ("%h.to_file_len"))) to_file;
> > +  unsigned int to_file_len;
> >    linenum_type to_line;
> 
> What's the intended interaction between this, the garbage-collector,
> and PCH?  Is to_file to be allocated in the GC-managed heap, or can it
> be outside of it?  Looking at patch 6 I see that this seems to be
> allocated (in destringize_and_run) by _cpp_unaligned_alloc.  I don't
> remember off the top of my head if that's valid.
> 
> >  
> >    /* Location from whence this line map was included.  For regular
> > @@ -1101,13 +1107,15 @@ extern line_map *line_map_new_raw (line_maps *, bool, unsigned);
> >     at least as long as the lifetime of SET.  An empty
> >     TO_FILE means standard input.  If reason is LC_LEAVE, and
> >     TO_FILE is NULL, then TO_FILE, TO_LINE and SYSP are given their
> > -   natural values considering the file we are returning to.
> > +   natural values considering the file we are returning to.  If reason
> > +   is LC_GEN, then TO_FILE is not a file name, but rather the actual
> > +   content, and TO_FILE_LEN>0 is the length of it.
> >  
> >     A call to this function can relocate the previous set of
> >     maps, so any stored line_map pointers should not be used.  */
> >  extern const line_map *linemap_add
> >    (class line_maps *, enum lc_reason, unsigned int sysp,
> > -   const char *to_file, linenum_type to_line);
> > +   const char *to_file, linenum_type to_line, unsigned int to_file_len = 0);
> >  
> >  /* Create a macro map.  A macro map encodes source locations of tokens
> >     that are part of a macro replacement-list, at a macro expansion
> > @@ -1304,7 +1312,8 @@ linemap_location_before_p (class line_maps *set,
> >  
> >  typedef struct
> >  {
> > -  /* The name of the source file involved.  */
> > +  /* The name of the source file involved, or NULL if
> > +     generated_data is non-NULL.  */
> >    const char *file;
> >  
> >    /* The line-location in the source file.  */
> > @@ -1316,6 +1325,10 @@ typedef struct
> >  
> >    /* In a system header?. */
> >    bool sysp;
> > +
> > +  /* If generated data, the data and its length.  */
> > +  unsigned int generated_data_len;
> > +  const char *generated_data;
> >  } expanded_location;
> 
> Probably worth noting that generated_data can contain NUL bytes, and
> isn't necessarily NUL-terminated.
> 
> 
> Thanks again for the patch; hope this is constructive
> Dave
> 

Hi Dave-

Thanks again for taking a look at this one, sorry it's so long. I redid this
patch 4/6 taking into account all of your suggestions. It's attached here.
Now, on the linemap side of things, I renamed the member variable from TO_FILE
to DATA, and created inline accessor functions to get at it.  The inline
accessors will assert that the linemap is of the correct type.  I checked all
the call sites and adjusted as needed.  On the input.cc side of things, I
switched it to use inheritance.  The logic for finding and caching lines
resides in a base class, while the two derived classes handle retrieving the
data from the necessary source (a file, or an in-memory buffer).  I think it's
much nicer now, please let me know what you think? Thanks!

BTW, the remaining patches downstream of this one do not need to be modified,
except that the new testcase for 5c/6 (the SARIF output patch) needs one line
changed since the output of -fdump-internal-locations now distinguishes LC_GEN
maps as well. I can resend that and/or any of the others once the dust
settles with this one if that's helpful.

-Lewis
-------------- next part --------------
[PATCH] diagnostics: libcpp: Add LC_GEN linemaps to support in-memory buffers

Add a new linemap reason LC_GEN which enables encoding the location of data
that was generated during compilation and does not appear in any source file.
There could be many use cases, such as, for instance, referring to the content
of builtin macros (not yet implemented, but an easy lift after this one.) The
first intended application is to create a place to store the input to a
_Pragma directive, so that proper locations can be assigned to those
tokens. This will be done in a subsequent commit.

The actual change needed to the line-maps API in libcpp is not too large and
requires no space overhead in the line map data structures (on 64-bit systems
that is; one newly added data member to class line_map_ordinary sits inside
former padding bytes.) An LC_GEN map is just an ordinary map like any other,
but the TO_FILE member that normally points to the file name points instead to
the actual data.  This works automatically with PCH as well, for the same
reason that the file name makes its way into a PCH.  In order to avoid
confusion, the member has been renamed from TO_FILE to DATA, and associated
accessors adjusted.

Outside libcpp, there are many small changes but most of them are to
selftests, which are necessarily more sensitive to implementation
details. From the perspective of the user (the "user", here, being a frontend
using line maps or else the diagnostics infrastructure), the chief visible
change is that the function location_get_source_line() should be passed an
expanded_location object instead of a separate filename and line number.  This
is not a big change because in most cases, this information came anyway from a
call to expand_location and the needed expanded_location object is readily
available. The new overload of location_get_source_line() uses the extra
information in the expanded_location object to obtain the data from the
in-memory buffer when it originated from an LC_GEN map.

Until the subsequent patch that starts using LC_GEN maps, none are yet
generated within GCC, hence nothing is added to the testsuite here; but all
relevant selftests have been extended to cover generated data maps in addition
to normal files.

libcpp/ChangeLog:

	* include/line-map.h (enum lc_reason): Add LC_GEN.
	(struct line_map_ordinary): Add new members to support LC_GEN concept.
	(ORDINARY_MAP_FILE_NAME): Assert that map really does encode a file
	and not generated data.
	(ORDINARY_MAP_GENERATED_DATA_P): New function.
	(ORDINARY_MAP_GENERATED_DATA): New function.
	(ORDINARY_MAP_GENERATED_DATA_LEN): New function.
	(ORDINARY_MAP_FILE_NAME_OR_DATA): New function.
	(ORDINARY_MAPS_SAME_FILE_P): Declare new function.
	(ORDINARY_MAP_CONTAINING_FILE_NAME): Declare new function.
	(LINEMAP_FILE): This was always a synonym for ORDINARY_MAP_FILE_NAME;
	make this explicit.
	(linemap_get_file_highest_location): Adjust prototype.
	(linemap_add): Adjust prototype.
	(class expanded_location): Add new members to store generated content.
	* line-map.cc (ORDINARY_MAP_CONTAINING_FILE_NAME): New function.
	(ORDINARY_MAPS_SAME_FILE_P): New function.
	(linemap_add): Add new argument DATA_LEN. Support generated data in
	LC_GEN maps.
	(linemap_check_files_exited): Adapt to API changes supporting LC_GEN.
	(linemap_line_start): Likewise.
	(linemap_position_for_loc_and_offset): Likewise.
	(linemap_get_expansion_filename): Likewise.
	(linemap_expand_location): Likewise.
	(linemap_dump): Likewise.
	(linemap_dump_location): Likewise.
	(linemap_get_file_highest_location): Likewise.
	* directives.cc (_cpp_do_file_change): Likewise.

gcc/ChangeLog:

	* diagnostic-show-locus.cc (make_range): Initialize new fields in
	expanded_location.
	(compatible_locations_p): Use new ORDINARY_MAPS_SAME_FILE_P ()
	function.
	(layout::calculate_x_offset_display): Use the new expanded_location
	overload of location_get_source_line(), so as to support LC_GEN maps.
	(layout::print_line): Likewise.
	(source_line::source_line): Likewise.
	(line_corrections::add_hint): Likewise.
	(class line_corrections): Store the location as an exploc rather than
	individual filename, so as to support LC_GEN maps.
	(layout::print_trailing_fixits): Use the new exploc constructor for
	class line_corrections.
	(test_layout_x_offset_display_utf8): Test LC_GEN maps as well as normal.
	(test_layout_x_offset_display_tab): Likewise.
	(test_diagnostic_show_locus_one_liner): Likewise.
	(test_diagnostic_show_locus_one_liner_utf8): Likewise.
	(test_add_location_if_nearby): Likewise.
	(test_diagnostic_show_locus_fixit_lines): Likewise.
	(test_fixit_consolidation): Likewise.
	(test_overlapped_fixit_printing): Likewise.
	(test_overlapped_fixit_printing_utf8): Likewise.
	(test_overlapped_fixit_printing_2): Likewise.
	(test_fixit_insert_containing_newline): Likewise.
	(test_fixit_insert_containing_newline_2): Likewise.
	(test_fixit_replace_containing_newline): Likewise.
	(test_fixit_deletion_affecting_newline): Likewise.
	(test_tab_expansion): Likewise.
	(test_escaping_bytes_1): Likewise.
	(test_escaping_bytes_2): Likewise.
	(test_line_numbers_multiline_range): Likewise.
	(diagnostic_show_locus_cc_tests): Likewise.
	* diagnostic.cc (diagnostic_report_current_module): Support LC_GEN
	maps when outputting include trace.
	(assert_location_text): Zero-initialize the expanded_location so as to
	cover all fields, including the newly added ones.
	* gcc-rich-location.cc (blank_line_before_p): Use the new
	expanded_location overload of location_get_source_line().
	* input.cc (special_fname_generated): New function.
	(class file_cache_slot): Factored out most of implementation to a new
	base class...
	(class cache_data_source): ... here.
	(cache_data_source::cache_data_source): New member function.
	(cache_data_source::~cache_data_source): New member function.
	(cache_data_source::reset): New member function.
	(class data_cache_slot): New derived class of cache_data_source which
	handles generated data.
	(data_cache_slot::create): New function.
	(expand_location_1): Handle LC_GEN locations.
	(total_lines_num): Likewise.
	(file_cache::lookup_data): New member function.
	(diagnostics_file_cache_forcibly_evict_data): New function.
	(file_cache::forcibly_evict_data): New member function.
	(file_cache::add_data): New member function.
	(file_cache::lookup_or_add_data): New member function.
	(file_cache::evicted_cache_tab_entry): Adapt to handle generated data
	locations.
	(file_cache::file_cache): Likewise.
	(file_cache::~file_cache): Likewise.
	(file_cache_slot::evict): Rename to...
	(file_cache_slot::reset): ...the new interface here.
	(file_cache_slot::create): Likewise.
	(file_cache_slot::file_cache_slot): Likewise.
	(file_cache_slot::~file_cache_slot): Likewise.
	(file_cache_slot::needs_read_p): Likewise.
	(file_cache_slot::needs_grow_p): Likewise.
	(file_cache_slot::maybe_grow): Likewise.
	(file_cache_slot::read_data): Likewise.
	(file_cache_slot::maybe_read_data): Rename to...
	(file_cache_slot::get_more_data): ...the new interface here.
	(find_end_of_line): Add missing const.
	(file_cache_slot::get_next_line): Refactored to...
	(cache_data_source::get_next_line): ...here.
	(file_cache_slot::goto_next_line): Refactored to...
	(cache_data_source::goto_next_line): ...here.
	(file_cache_slot::read_line_num): Refactored to...
	(cache_data_source::read_line_num): ...here.
	(location_get_source_line): Change to take an expanded_location
	argument instead of a filename.  Support generated data. Add another
	overload taking a filename that delegates to this one.
	(location_compute_display_column): Use new overload of
	location_get_source_line and handle generated data locations.
	(dump_location_info): Likewise.
	(get_substring_ranges_for_loc): Likewise.
	(temp_source_file::do_linemap_add): New member function.
	(line_table_test::line_table_test): Initialize the new member.
	(test_accessing_ordinary_linemaps): Test generated data as well as
	normal files.
	(test_make_location_nonpure_range_endpoints): Likewise.
	(test_line_offset_overflow): Likewise.
	(for_each_line_table_case): Add new argument requesting to test
	generated data.
	(input_cc_tests): Enable testing generated data in the selftests.
	* input.h (special_fname_generated): Declare new function.
	(location_get_source_line): Add new overload taking an
	expanded_location.
	(class data_cache_slot): Forward declare.
	(class file_cache): Add a cache of generated data buffers as well as
	ordinary file buffers.
	(diagnostics_file_cache_forcibly_evict_data): Declare new function.
	* selftest.cc (named_temp_file::named_temp_file): Support nullptr
	argument to disable creating any file.
	(named_temp_file::~named_temp_file): Likewise.
	(temp_source_file::temp_source_file): Add a new constructor argument
	to enable creating generated data instead of a file.
	(temp_source_file::~temp_source_file): Handle freeing generated data buffer.
	* selftest.h (struct line_map_ordinary): Forward declare.
	(class named_temp_file): Add missing explicit on constructor.
	(class temp_source_file): Add new members to store generated content.
	(class line_table_test): Add new m_generated_data member.
	(for_each_line_table_case): Update prototype for new argument.

gcc/c-family/ChangeLog:
	* c-common.cc (try_to_locate_new_include_insertion_point): Add
	awareness of LC_GEN maps.
	* c-format.cc (get_corrected_substring): Use the new expanded_location
	overload of location_get_source_line(), so as to support LC_GEN maps.
	* c-indentation.cc (get_visual_column): Likewise.
	(get_first_nws_vis_column): Likewise.
	(detect_intervening_unindent): Likewise.
	(should_warn_for_misleading_indentation): Likewise.
	(assert_get_visual_column_succeeds): Zero-initialize the exploc to
	cover all fields including those newly added.
	(assert_get_visual_column_fails): Likewise.

gcc/cp/ChangeLog:

	* module.cc (module_state::write_ordinary_maps): Ignore LC_GEN maps to
	be safe.
	(module_state::read_ordinary_maps): Likewise.

gcc/go/ChangeLog:

	* go-linemap.cc (Gcc_linemap::to_string): Adapt to linemaps API change.

gcc/testsuite/ChangeLog:

	* gcc.dg/plugin/diagnostic_plugin_test_show_locus.c: Use the new
	overload of location_get_source_line.

diff --git a/gcc/c-family/c-common.cc b/gcc/c-family/c-common.cc
index 6f1f21bc4c1..e372d28c546 100644
--- a/gcc/c-family/c-common.cc
+++ b/gcc/c-family/c-common.cc
@@ -9185,11 +9185,15 @@ try_to_locate_new_include_insertion_point (const char *file, location_t loc)
       const line_map_ordinary *ord_map
 	= LINEMAPS_ORDINARY_MAP_AT (line_table, i);
 
+      if (ORDINARY_MAP_GENERATED_DATA_P (ord_map))
+	continue;
+
       if (const line_map_ordinary *from
 	  = linemap_included_from_linemap (line_table, ord_map))
 	/* We cannot use pointer equality, because with preprocessed
 	   input all filename strings are unique.  */
-	if (0 == strcmp (from->to_file, file))
+	if (!ORDINARY_MAP_GENERATED_DATA_P (from)
+	    && 0 == strcmp (ORDINARY_MAP_FILE_NAME (from), file))
 	  {
 	    last_include_ord_map = from;
 	    last_ord_map_after_include = NULL;
@@ -9197,7 +9201,8 @@ try_to_locate_new_include_insertion_point (const char *file, location_t loc)
 
       /* Likewise, use strcmp, and reject any line-zero introductory
 	 map.  */
-      if (ord_map->to_line && 0 == strcmp (ord_map->to_file, file))
+      if (ord_map->to_line
+	  && 0 == strcmp (ORDINARY_MAP_FILE_NAME (ord_map), file))
 	{
 	  if (!first_ord_map_in_file)
 	    first_ord_map_in_file = ord_map;
diff --git a/gcc/c-family/c-format.cc b/gcc/c-family/c-format.cc
index 01adea4ff41..87ad3e74b72 100644
--- a/gcc/c-family/c-format.cc
+++ b/gcc/c-family/c-format.cc
@@ -4538,7 +4538,7 @@ get_corrected_substring (const substring_loc &fmt_loc,
   if (caret.column > finish.column)
     return NULL;
 
-  char_span line = location_get_source_line (start.file, start.line);
+  char_span line = location_get_source_line (start);
   if (!line)
     return NULL;
 
diff --git a/gcc/c-family/c-indentation.cc b/gcc/c-family/c-indentation.cc
index 85a3ae1b303..42738dd4d13 100644
--- a/gcc/c-family/c-indentation.cc
+++ b/gcc/c-family/c-indentation.cc
@@ -50,7 +50,7 @@ get_visual_column (expanded_location exploc,
 		   unsigned int *first_nws,
 		   unsigned int tab_width)
 {
-  char_span line = location_get_source_line (exploc.file, exploc.line);
+  char_span line = location_get_source_line (exploc);
   if (!line)
     return false;
   if ((size_t)exploc.column > line.length ())
@@ -87,13 +87,13 @@ get_visual_column (expanded_location exploc,
    Otherwise, return false, leaving *FIRST_NWS untouched.  */
 
 static bool
-get_first_nws_vis_column (const char *file, int line_num,
+get_first_nws_vis_column (expanded_location exploc,
 			  unsigned int *first_nws,
 			  unsigned int tab_width)
 {
   gcc_assert (first_nws);
 
-  char_span line = location_get_source_line (file, line_num);
+  char_span line = location_get_source_line (exploc);
   if (!line)
     return false;
   unsigned int vis_column = 0;
@@ -158,19 +158,18 @@ get_first_nws_vis_column (const char *file, int line_num,
    Return true if such an unindent/outdent is detected.  */
 
 static bool
-detect_intervening_unindent (const char *file,
-			     int body_line,
+detect_intervening_unindent (expanded_location exploc,
 			     int next_stmt_line,
 			     unsigned int vis_column,
 			     unsigned int tab_width)
 {
-  gcc_assert (file);
-  gcc_assert (next_stmt_line > body_line);
+  gcc_assert (exploc.file);
+  gcc_assert (next_stmt_line > exploc.line);
 
-  for (int line = body_line + 1; line < next_stmt_line; line++)
+  while (++exploc.line < next_stmt_line)
     {
       unsigned int line_vis_column;
-      if (get_first_nws_vis_column (file, line, &line_vis_column, tab_width))
+      if (get_first_nws_vis_column (exploc, &line_vis_column, tab_width))
 	if (line_vis_column < vis_column)
 	  return true;
     }
@@ -528,8 +527,7 @@ should_warn_for_misleading_indentation (const token_indent_info &guard_tinfo,
 
 	  /* Don't warn if there is an unindent between the two statements. */
 	  int vis_column = MIN (next_stmt_vis_column, body_vis_column);
-	  if (detect_intervening_unindent (body_exploc.file, body_exploc.line,
-					   next_stmt_exploc.line,
+	  if (detect_intervening_unindent (body_exploc, next_stmt_exploc.line,
 					   vis_column, tab_width))
 	    return false;
 
@@ -691,12 +689,10 @@ assert_get_visual_column_succeeds (const location &loc,
 				   unsigned int expected_visual_column,
 				   unsigned int expected_first_nws)
 {
-  expanded_location exploc;
+  expanded_location exploc = {};
   exploc.file = file;
   exploc.line = line;
   exploc.column = column;
-  exploc.data = NULL;
-  exploc.sysp = false;
   unsigned int actual_visual_column;
   unsigned int actual_first_nws;
   bool result = get_visual_column (exploc,
@@ -729,12 +725,10 @@ assert_get_visual_column_fails (const location &loc,
 				const char *file, int line, int column,
 				const unsigned int tab_width)
 {
-  expanded_location exploc;
+  expanded_location exploc = {};
   exploc.file = file;
   exploc.line = line;
   exploc.column = column;
-  exploc.data = NULL;
-  exploc.sysp = false;
   unsigned int actual_visual_column;
   unsigned int actual_first_nws;
   bool result = get_visual_column (exploc,
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 0e9af318ba4..8defcf85a64 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -16212,6 +16212,8 @@ module_state::write_ordinary_maps (elf_out *to, range_t &info,
        iter != end; ++iter)
     if (iter->src != current)
       {
+	if (ORDINARY_MAP_GENERATED_DATA_P (iter->src))
+	  continue;
 	current = iter->src;
 	const char *fname = ORDINARY_MAP_FILE_NAME (iter->src);
 
@@ -16229,7 +16231,7 @@ module_state::write_ordinary_maps (elf_out *to, range_t &info,
 		   preprocessed input we could have multiple instances
 		   of the same name, and we'd rather not percolate
 		   that.  */
-		const_cast<line_map_ordinary *> (iter->src)->to_file = name;
+		const_cast<line_map_ordinary *> (iter->src)->data = name;
 		fname = NULL;
 		break;
 	      }
@@ -16257,6 +16259,8 @@ module_state::write_ordinary_maps (elf_out *to, range_t &info,
   for (auto iter = ord_loc_remap->begin (), end = ord_loc_remap->end ();
        iter != end; ++iter)
     {
+      if (ORDINARY_MAP_GENERATED_DATA_P (iter->src))
+	continue;
       dump (dumper::LOCATION)
 	&& dump ("Span:%u ordinary [%u+%u,+%u)->[%u,+%u)",
 		 iter - ord_loc_remap->begin (),
@@ -16418,7 +16422,8 @@ module_state::read_ordinary_maps (unsigned num_ord_locs, unsigned range_bits)
 	  map->m_range_bits = sec.u ();
 	  map->m_column_and_range_bits = sec.u () + map->m_range_bits;
 	  unsigned fnum = sec.u ();
-	  map->to_file = (fnum < filenames.length () ? filenames[fnum] : "");
+	  map->data = (fnum < filenames.length () ? filenames[fnum] : "");
+	  map->data_len = 1 + strlen (map->data);
 	  map->to_line = sec.u ();
 	  base = map;
 	}
diff --git a/gcc/diagnostic-show-locus.cc b/gcc/diagnostic-show-locus.cc
index 9d430b5189c..c5a6e888314 100644
--- a/gcc/diagnostic-show-locus.cc
+++ b/gcc/diagnostic-show-locus.cc
@@ -709,9 +709,9 @@ static layout_range
 make_range (int start_line, int start_col, int end_line, int end_col)
 {
   const expanded_location start_exploc
-    = {"", start_line, start_col, NULL, false};
+    = {"", start_line, start_col, NULL, false, 0, NULL};
   const expanded_location finish_exploc
-    = {"", end_line, end_col, NULL, false};
+    = {"", end_line, end_col, NULL, false, 0, NULL};
   return layout_range (exploc_with_display_col (start_exploc, def_policy (),
 						LOCATION_ASPECT_START),
 		       exploc_with_display_col (finish_exploc, def_policy (),
@@ -998,7 +998,7 @@ compatible_locations_p (location_t loc_a, location_t loc_b)
 	 are in the same file.  */
       const line_map_ordinary *ord_map_a = linemap_check_ordinary (map_a);
       const line_map_ordinary *ord_map_b = linemap_check_ordinary (map_b);
-      return ord_map_a->to_file == ord_map_b->to_file;
+      return ORDINARY_MAPS_SAME_FILE_P (ord_map_a, ord_map_b);
     }
 }
 
@@ -1614,8 +1614,7 @@ layout::calculate_x_offset_display ()
       return;
     }
 
-  const char_span line = location_get_source_line (m_exploc.file,
-						   m_exploc.line);
+  const char_span line = location_get_source_line (m_exploc);
   if (!line)
     {
       /* Nothing to do, we couldn't find the source line.  */
@@ -2398,17 +2397,18 @@ class line_corrections
 {
 public:
   line_corrections (const char_display_policy &policy,
-		    const char *filename,
-		    linenum_type row)
-  : m_policy (policy), m_filename (filename), m_row (row)
-  {}
+		    expanded_location exploc, linenum_type row = 0)
+  : m_policy (policy), m_exploc (exploc)
+  {
+    if (row)
+      m_exploc.line = row;
+  }
   ~line_corrections ();
 
   void add_hint (const fixit_hint *hint);
 
   const char_display_policy &m_policy;
-  const char *m_filename;
-  linenum_type m_row;
+  expanded_location m_exploc;
   auto_vec <correction *> m_corrections;
 };
 
@@ -2428,7 +2428,7 @@ line_corrections::~line_corrections ()
 class source_line
 {
 public:
-  source_line (const char *filename, int line);
+  explicit source_line (expanded_location xloc);
 
   char_span as_span () { return char_span (chars, width); }
 
@@ -2438,9 +2438,9 @@ public:
 
 /* source_line's ctor.  */
 
-source_line::source_line (const char *filename, int line)
+source_line::source_line (expanded_location exploc)
 {
-  char_span span = location_get_source_line (filename, line);
+  char_span span = location_get_source_line (exploc);
   chars = span.get_buffer ();
   width = span.length ();
 }
@@ -2482,7 +2482,7 @@ line_corrections::add_hint (const fixit_hint *hint)
 				affected_bytes.start - 1);
 
 	  /* Try to read the source.  */
-	  source_line line (m_filename, m_row);
+	  source_line line (m_exploc);
 	  if (line.chars && between.finish < line.width)
 	    {
 	      /* Consolidate into the last correction:
@@ -2538,7 +2538,7 @@ layout::print_trailing_fixits (linenum_type row)
 {
   /* Build a list of correction instances for the line,
      potentially consolidating hints (for the sake of readability).  */
-  line_corrections corrections (m_policy, m_exploc.file, row);
+  line_corrections corrections (m_policy, m_exploc, row);
   for (unsigned int i = 0; i < m_fixit_hints.length (); i++)
     {
       const fixit_hint *hint = m_fixit_hints[i];
@@ -2776,7 +2776,7 @@ layout::show_ruler (int max_column) const
 void
 layout::print_line (linenum_type row)
 {
-  char_span line = location_get_source_line (m_exploc.file, row);
+  char_span line = location_get_source_line (m_exploc, row);
   if (!line)
     return;
 
@@ -2985,10 +2985,10 @@ test_layout_x_offset_display_utf8 (const line_table_case &case_)
      no multibyte characters earlier on the line.  */
   const int emoji_col = 102;
 
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
   line_table_test ltt (case_);
-
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, 1 + line_bytes,
+			ltt.m_generated_data);
+  tmp.do_linemap_add (1);
 
   location_t line_end = linemap_position_for_column (line_table, line_bytes);
 
@@ -2996,17 +2996,23 @@ test_layout_x_offset_display_utf8 (const line_table_case &case_)
   if (line_end > LINE_MAP_MAX_LOCATION_WITH_COLS)
     return;
 
-  ASSERT_STREQ (tmp.get_filename (), LOCATION_FILE (line_end));
+  if (ltt.m_generated_data)
+    {
+      ASSERT_EQ (nullptr, tmp.get_filename ());
+      ASSERT_STREQ (special_fname_generated (), LOCATION_FILE (line_end));
+    }
+  else
+    ASSERT_STREQ (tmp.get_filename (), LOCATION_FILE (line_end));
   ASSERT_EQ (1, LOCATION_LINE (line_end));
   ASSERT_EQ (line_bytes, LOCATION_COLUMN (line_end));
 
-  char_span lspan = location_get_source_line (tmp.get_filename (), 1);
+  const expanded_location xloc = expand_location (line_end);
+  char_span lspan = location_get_source_line (xloc);
   ASSERT_EQ (line_display_cols,
 	     cpp_display_width (lspan.get_buffer (), lspan.length (),
 				def_policy ()));
   ASSERT_EQ (line_display_cols,
-	     location_compute_display_column (expand_location (line_end),
-					      def_policy ()));
+	     location_compute_display_column (xloc, def_policy ()));
   ASSERT_EQ (0, memcmp (lspan.get_buffer () + (emoji_col - 1),
 			"\xf0\x9f\x98\x82\xf0\x9f\x98\x82", 8));
 
@@ -3138,10 +3144,10 @@ test_layout_x_offset_display_tab (const line_table_case &case_)
      a space would have taken up.  */
   ASSERT_EQ (7, extra_width[10]);
 
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
   line_table_test ltt (case_);
-
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, line_bytes + 1,
+			ltt.m_generated_data);
+  tmp.do_linemap_add (1);
 
   location_t line_end = linemap_position_for_column (line_table, line_bytes);
 
@@ -3150,7 +3156,8 @@ test_layout_x_offset_display_tab (const line_table_case &case_)
     return;
 
   /* Check that cpp_display_width handles the tabs as expected.  */
-  char_span lspan = location_get_source_line (tmp.get_filename (), 1);
+  const expanded_location xloc = expand_location (line_end);
+  char_span lspan = location_get_source_line (xloc);
   ASSERT_EQ ('\t', *(lspan.get_buffer () + (tab_col - 1)));
   for (int tabstop = 1; tabstop != num_tabstops; ++tabstop)
     {
@@ -3159,8 +3166,7 @@ test_layout_x_offset_display_tab (const line_table_case &case_)
 		 cpp_display_width (lspan.get_buffer (), lspan.length (),
 				    policy));
       ASSERT_EQ (line_bytes + extra_width[tabstop],
-		 location_compute_display_column (expand_location (line_end),
-						  policy));
+		 location_compute_display_column (xloc, policy));
     }
 
   /* Check that the tab is expanded to the expected number of spaces.  */
@@ -3784,10 +3790,10 @@ test_diagnostic_show_locus_one_liner (const line_table_case &case_)
      ....................0000000001111111.
      ....................1234567890123456.  */
   const char *content = "foo = bar.field;\n";
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
   line_table_test ltt (case_);
-
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, strlen (content),
+			ltt.m_generated_data);
+  tmp.do_linemap_add (1);
 
   location_t line_end = linemap_position_for_column (line_table, 16);
 
@@ -3795,7 +3801,14 @@ test_diagnostic_show_locus_one_liner (const line_table_case &case_)
   if (line_end > LINE_MAP_MAX_LOCATION_WITH_COLS)
     return;
 
-  ASSERT_STREQ (tmp.get_filename (), LOCATION_FILE (line_end));
+  if (ltt.m_generated_data)
+    {
+      ASSERT_EQ (nullptr, tmp.get_filename ());
+      ASSERT_STREQ (special_fname_generated (), LOCATION_FILE (line_end));
+    }
+  else
+    ASSERT_STREQ (tmp.get_filename (), LOCATION_FILE (line_end));
+
   ASSERT_EQ (1, LOCATION_LINE (line_end));
   ASSERT_EQ (16, LOCATION_COLUMN (line_end));
 
@@ -4366,10 +4379,10 @@ test_diagnostic_show_locus_one_liner_utf8 (const line_table_case &case_)
     /* 0000000000000000000001111111111111111111222222222222222222222233333
        1111222233334444567890122223333456789999000011112222345678999900001
        Byte columns.  */
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
   line_table_test ltt (case_);
-
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, strlen (content),
+			ltt.m_generated_data);
+  tmp.do_linemap_add (1);
 
   location_t line_end = linemap_position_for_column (line_table, 31);
 
@@ -4377,11 +4390,18 @@ test_diagnostic_show_locus_one_liner_utf8 (const line_table_case &case_)
   if (line_end > LINE_MAP_MAX_LOCATION_WITH_COLS)
     return;
 
-  ASSERT_STREQ (tmp.get_filename (), LOCATION_FILE (line_end));
+  if (ltt.m_generated_data)
+    {
+      ASSERT_EQ (nullptr, tmp.get_filename ());
+      ASSERT_STREQ (special_fname_generated (), LOCATION_FILE (line_end));
+    }
+  else
+    ASSERT_STREQ (tmp.get_filename (), LOCATION_FILE (line_end));
+
   ASSERT_EQ (1, LOCATION_LINE (line_end));
   ASSERT_EQ (31, LOCATION_COLUMN (line_end));
 
-  char_span lspan = location_get_source_line (tmp.get_filename (), 1);
+  char_span lspan = location_get_source_line (expand_location (line_end));
   ASSERT_EQ (25, cpp_display_width (lspan.get_buffer (), lspan.length (),
 				    def_policy ()));
   ASSERT_EQ (25, location_compute_display_column (expand_location (line_end),
@@ -4418,12 +4438,10 @@ test_add_location_if_nearby (const line_table_case &case_)
        "  double x;\n"                              /* line 4.  */
        "  double y;\n"                              /* line 5.  */
        ";\n");                                      /* line 6.  */
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
   line_table_test ltt (case_);
-
-  const line_map_ordinary *ord_map
-    = linemap_check_ordinary (linemap_add (line_table, LC_ENTER, false,
-					   tmp.get_filename (), 0));
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, strlen (content),
+			ltt.m_generated_data);
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
 
   linemap_line_start (line_table, 1, 100);
 
@@ -4482,12 +4500,10 @@ test_diagnostic_show_locus_fixit_lines (const line_table_case &case_)
        "\n"                                      /* line 4.  */
        "\n"                                      /* line 5.  */
        "                        : 0.0};\n");     /* line 6.  */
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
   line_table_test ltt (case_);
-
-  const line_map_ordinary *ord_map
-    = linemap_check_ordinary (linemap_add (line_table, LC_ENTER, false,
-					   tmp.get_filename (), 0));
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, strlen (content),
+			ltt.m_generated_data);
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
 
   linemap_line_start (line_table, 1, 100);
 
@@ -4578,8 +4594,10 @@ static void
 test_fixit_consolidation (const line_table_case &case_)
 {
   line_table_test ltt (case_);
-
-  linemap_add (line_table, LC_ENTER, false, "test.c", 1);
+  if (ltt.m_generated_data)
+    linemap_add (line_table, LC_GEN, false, "some content", 1, 13);
+  else
+    linemap_add (line_table, LC_ENTER, false, "test.c", 1);
 
   const location_t c10 = linemap_position_for_column (line_table, 10);
   const location_t c15 = linemap_position_for_column (line_table, 15);
@@ -4725,13 +4743,11 @@ test_overlapped_fixit_printing (const line_table_case &case_)
      ...123456789012345678901234567890123456789.  */
   const char *content
     = ("  foo *f = (foo *)ptr->field;\n");
-  temp_source_file tmp (SELFTEST_LOCATION, ".C", content);
   line_table_test ltt (case_);
+  temp_source_file tmp (SELFTEST_LOCATION, ".C", content, strlen (content),
+			ltt.m_generated_data);
 
-  const line_map_ordinary *ord_map
-    = linemap_check_ordinary (linemap_add (line_table, LC_ENTER, false,
-					   tmp.get_filename (), 0));
-
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   const location_t final_line_end
@@ -4752,6 +4768,8 @@ test_overlapped_fixit_printing (const line_table_case &case_)
     = linemap_position_for_line_and_column (line_table, ord_map, 1, 28);
   const location_t expr = make_location (expr_start, expr_start, expr_finish);
 
+  const expanded_location xloc = expand_location (expr);
+
   /* Various examples of fix-it hints that aren't themselves consolidated,
      but for which the *printing* may need consolidation.  */
 
@@ -4795,7 +4813,7 @@ test_overlapped_fixit_printing (const line_table_case &case_)
     /* Add each hint in turn to a line_corrections instance,
        and verify that they are consolidated into one correction instance
        as expected.  */
-    line_corrections lc (policy, tmp.get_filename (), 1);
+    line_corrections lc (policy, xloc);
 
     /* The first replace hint by itself.  */
     lc.add_hint (hint_0);
@@ -4936,13 +4954,10 @@ test_overlapped_fixit_printing_utf8 (const line_table_case &case_)
        12344445555666677778901234566667777888899990123456789012333344445
        Byte columns.  */
 
-  temp_source_file tmp (SELFTEST_LOCATION, ".C", content);
   line_table_test ltt (case_);
-
-  const line_map_ordinary *ord_map
-    = linemap_check_ordinary (linemap_add (line_table, LC_ENTER, false,
-					   tmp.get_filename (), 0));
-
+  temp_source_file tmp (SELFTEST_LOCATION, ".C", content, strlen (content),
+			ltt.m_generated_data);
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   const location_t final_line_end
@@ -4963,6 +4978,8 @@ test_overlapped_fixit_printing_utf8 (const line_table_case &case_)
     = linemap_position_for_line_and_column (line_table, ord_map, 1, 34);
   const location_t expr = make_location (expr_start, expr_start, expr_finish);
 
+  const expanded_location xloc = expand_location (expr);
+
   /* Various examples of fix-it hints that aren't themselves consolidated,
      but for which the *printing* may need consolidation.  */
 
@@ -5011,7 +5028,7 @@ test_overlapped_fixit_printing_utf8 (const line_table_case &case_)
     /* Add each hint in turn to a line_corrections instance,
        and verify that they are consolidated into one correction instance
        as expected.  */
-    line_corrections lc (policy, tmp.get_filename (), 1);
+    line_corrections lc (policy, xloc);
 
     /* The first replace hint by itself.  */
     lc.add_hint (hint_0);
@@ -5169,13 +5186,11 @@ test_overlapped_fixit_printing_2 (const line_table_case &case_)
      ...123456789012345678901234567890123456789.  */
   const char *content
     = ("int a5[][0][0] = { 1, 2 };\n");
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
+
   line_table_test ltt (case_);
-
-  const line_map_ordinary *ord_map
-    = linemap_check_ordinary (linemap_add (line_table, LC_ENTER, false,
-					   tmp.get_filename (), 0));
-
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, strlen (content),
+			ltt.m_generated_data);
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   const location_t final_line_end
@@ -5260,10 +5275,10 @@ test_fixit_insert_containing_newline (const line_table_case &case_)
 			     "      x = a;\n"  /* line 2. */
 			     "    case 'b':\n" /* line 3. */
 			     "      x = b;\n");/* line 4. */
-
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content);
   line_table_test ltt (case_);
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 3);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content,
+			strlen (old_content), false);
+  tmp.do_linemap_add (3);
 
   location_t case_start = linemap_position_for_column (line_table, 5);
   location_t case_finish = linemap_position_for_column (line_table, 13);
@@ -5331,12 +5346,11 @@ test_fixit_insert_containing_newline_2 (const line_table_case &case_)
 			     "{\n"              /* line 2. */
 			     " putchar (ch);\n" /* line 3. */
 			     "}\n");            /* line 4. */
-
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content);
   line_table_test ltt (case_);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content,
+			strlen (old_content), ltt.m_generated_data);
 
-  const line_map_ordinary *ord_map = linemap_check_ordinary
-    (linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   /* The primary range is the "putchar" token.  */
@@ -5395,9 +5409,10 @@ test_fixit_replace_containing_newline (const line_table_case &case_)
     .........................1234567890123.  */
   const char *old_content = "foo = bar ();\n";
 
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content);
   line_table_test ltt (case_);
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content,
+			strlen (old_content), ltt.m_generated_data);
+  tmp.do_linemap_add (1);
 
   /* Replace the " = " with "\n  = ", as if we were reformatting an
      overly long line.  */
@@ -5435,10 +5450,10 @@ test_fixit_deletion_affecting_newline (const line_table_case &case_)
   const char *old_content = ("foo = bar (\n"
 			     "      );\n");
 
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content);
   line_table_test ltt (case_);
-  const line_map_ordinary *ord_map = linemap_check_ordinary
-    (linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", old_content,
+			strlen (old_content), ltt.m_generated_data);
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   /* Attempt to delete the " (\n...)".  */
@@ -5487,9 +5502,10 @@ test_tab_expansion (const line_table_case &case_)
   const int last_byte_col = 25;
   ASSERT_EQ (35, cpp_display_width (content, last_byte_col, policy));
 
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
   line_table_test ltt (case_);
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, strlen (content),
+			ltt.m_generated_data);
+  tmp.do_linemap_add (1);
 
   /* Don't attempt to run the tests if column data might be unavailable.  */
   location_t line_end = linemap_position_for_column (line_table, last_byte_col);
@@ -5536,15 +5552,14 @@ test_escaping_bytes_1 (const line_table_case &case_)
 {
   const char content[] = "before\0\1\2\3\v\x80\xff""after\n";
   const size_t sz = sizeof (content);
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, sz);
   line_table_test ltt (case_);
-  const line_map_ordinary *ord_map = linemap_check_ordinary
-    (linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, sz,
+			ltt.m_generated_data);
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   location_t finish
-    = linemap_position_for_line_and_column (line_table, ord_map, 1,
-					    strlen (content));
+    = linemap_position_for_line_and_column (line_table, ord_map, 1, sz);
 
   if (finish > LINE_MAP_MAX_LOCATION_WITH_COLS)
     return;
@@ -5592,15 +5607,14 @@ test_escaping_bytes_2 (const line_table_case &case_)
 {
   const char content[]  = "\0after\n";
   const size_t sz = sizeof (content);
-  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, sz);
   line_table_test ltt (case_);
-  const line_map_ordinary *ord_map = linemap_check_ordinary
-    (linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
+  temp_source_file tmp (SELFTEST_LOCATION, ".c", content, sz,
+			ltt.m_generated_data);
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   location_t finish
-    = linemap_position_for_line_and_column (line_table, ord_map, 1,
-					    strlen (content));
+    = linemap_position_for_line_and_column (line_table, ord_map, 1, sz);
 
   if (finish > LINE_MAP_MAX_LOCATION_WITH_COLS)
     return;
@@ -5652,8 +5666,7 @@ test_line_numbers_multiline_range ()
   temp_source_file tmp (SELFTEST_LOCATION, ".txt", pp_formatted_text (&pp));
   line_table_test ltt;
 
-  const line_map_ordinary *ord_map = linemap_check_ordinary
-    (linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
+  const line_map_ordinary *ord_map = tmp.do_linemap_add (0);
   linemap_line_start (line_table, 1, 100);
 
   /* Create a multi-line location, starting at the "line" of line 9, with
@@ -5694,28 +5707,28 @@ diagnostic_show_locus_cc_tests ()
 
   test_display_widths ();
 
-  for_each_line_table_case (test_layout_x_offset_display_utf8);
-  for_each_line_table_case (test_layout_x_offset_display_tab);
+  for_each_line_table_case (test_layout_x_offset_display_utf8, true);
+  for_each_line_table_case (test_layout_x_offset_display_tab, true);
 
   test_get_line_bytes_without_trailing_whitespace ();
 
   test_diagnostic_show_locus_unknown_location ();
 
-  for_each_line_table_case (test_diagnostic_show_locus_one_liner);
-  for_each_line_table_case (test_diagnostic_show_locus_one_liner_utf8);
-  for_each_line_table_case (test_add_location_if_nearby);
-  for_each_line_table_case (test_diagnostic_show_locus_fixit_lines);
-  for_each_line_table_case (test_fixit_consolidation);
-  for_each_line_table_case (test_overlapped_fixit_printing);
-  for_each_line_table_case (test_overlapped_fixit_printing_utf8);
-  for_each_line_table_case (test_overlapped_fixit_printing_2);
-  for_each_line_table_case (test_fixit_insert_containing_newline);
-  for_each_line_table_case (test_fixit_insert_containing_newline_2);
-  for_each_line_table_case (test_fixit_replace_containing_newline);
-  for_each_line_table_case (test_fixit_deletion_affecting_newline);
-  for_each_line_table_case (test_tab_expansion);
-  for_each_line_table_case (test_escaping_bytes_1);
-  for_each_line_table_case (test_escaping_bytes_2);
+  for_each_line_table_case (test_diagnostic_show_locus_one_liner, true);
+  for_each_line_table_case (test_diagnostic_show_locus_one_liner_utf8, true);
+  for_each_line_table_case (test_add_location_if_nearby, true);
+  for_each_line_table_case (test_diagnostic_show_locus_fixit_lines, true);
+  for_each_line_table_case (test_fixit_consolidation, true);
+  for_each_line_table_case (test_overlapped_fixit_printing, true);
+  for_each_line_table_case (test_overlapped_fixit_printing_utf8, true);
+  for_each_line_table_case (test_overlapped_fixit_printing_2, true);
+  for_each_line_table_case (test_fixit_insert_containing_newline, true);
+  for_each_line_table_case (test_fixit_insert_containing_newline_2, true);
+  for_each_line_table_case (test_fixit_replace_containing_newline, true);
+  for_each_line_table_case (test_fixit_deletion_affecting_newline, true);
+  for_each_line_table_case (test_tab_expansion, true);
+  for_each_line_table_case (test_escaping_bytes_1, true);
+  for_each_line_table_case (test_escaping_bytes_2, true);
 
   test_line_numbers_multiline_range ();
 }
diff --git a/gcc/diagnostic.cc b/gcc/diagnostic.cc
index 7c7ee6da746..52b2f2df75f 100644
--- a/gcc/diagnostic.cc
+++ b/gcc/diagnostic.cc
@@ -771,13 +771,15 @@ diagnostic_report_current_module (diagnostic_context *context, location_t where)
       if (!includes_seen (context, map))
 	{
 	  bool first = true, need_inc = true, was_module = MAP_MODULE_P (map);
+	  const bool was_gen = ORDINARY_MAP_GENERATED_DATA_P (map);
 	  expanded_location s = {};
 	  do
 	    {
 	      where = linemap_included_from (map);
 	      map = linemap_included_from_linemap (line_table, map);
 	      bool is_module = MAP_MODULE_P (map);
-	      s.file = LINEMAP_FILE (map);
+	      s.file = (ORDINARY_MAP_GENERATED_DATA_P (map)
+			? special_fname_generated () : LINEMAP_FILE (map));
 	      s.line = SOURCE_LINE (map, where);
 	      int col = -1;
 	      if (first && context->show_column)
@@ -796,10 +798,13 @@ diagnostic_report_current_module (diagnostic_context *context, location_t where)
 		 N_("of module"),
 		 N_("In module imported at"),	/* 6 */
 		 N_("imported at"),
+		 N_("In buffer generated from"),   /* 8 */
 		};
 
-	      unsigned index = (was_module ? 6 : is_module ? 4
-				: need_inc ? 2 : 0) + !first;
+	      const unsigned index
+		= was_gen ? 8
+		: ((was_module ? 6 : is_module ? 4 : need_inc ? 2 : 0)
+		   + !first);
 
 	      pp_verbatim (context->printer, "%s%s %r%s%s%R",
 			   first ? "" : was_module ? ", " : ",\n",
@@ -2573,12 +2578,10 @@ assert_location_text (const char *expected_loc_text,
   dc.column_unit = column_unit;
   dc.column_origin = origin;
 
-  expanded_location xloc;
+  expanded_location xloc = {};
   xloc.file = filename;
   xloc.line = line;
   xloc.column = column;
-  xloc.data = NULL;
-  xloc.sysp = false;
 
   char *actual_loc_text = diagnostic_get_location_text (&dc, xloc);
   ASSERT_STREQ (expected_loc_text, actual_loc_text);
diff --git a/gcc/gcc-rich-location.cc b/gcc/gcc-rich-location.cc
index 0fa4239bd29..4836624f03c 100644
--- a/gcc/gcc-rich-location.cc
+++ b/gcc/gcc-rich-location.cc
@@ -78,7 +78,7 @@ static bool
 blank_line_before_p (location_t loc)
 {
   expanded_location exploc = expand_location (loc);
-  char_span line = location_get_source_line (exploc.file, exploc.line);
+  char_span line = location_get_source_line (exploc);
   if (!line)
     return false;
   if (line.length () < (size_t)exploc.column)
diff --git a/gcc/go/go-linemap.cc b/gcc/go/go-linemap.cc
index 1d72e79647d..02d4ce04181 100644
--- a/gcc/go/go-linemap.cc
+++ b/gcc/go/go-linemap.cc
@@ -84,7 +84,8 @@ Gcc_linemap::to_string(Location location)
   resolved_location =
       linemap_resolve_location (line_table, location.gcc_location(),
                                 LRK_SPELLING_LOCATION, &lmo);
-  if (lmo == NULL || resolved_location < RESERVED_LOCATION_COUNT)
+  if (lmo == NULL || resolved_location < RESERVED_LOCATION_COUNT
+      || ORDINARY_MAP_GENERATED_DATA_P (lmo))
     return "";
   const char *path = LINEMAP_FILE (lmo);
   if (!path)
diff --git a/gcc/input.cc b/gcc/input.cc
index 18777a813b0..afeca61297a 100644
--- a/gcc/input.cc
+++ b/gcc/input.cc
@@ -35,6 +35,12 @@ special_fname_builtin ()
   return _("<built-in>");
 }
 
+const char *
+special_fname_generated ()
+{
+  return _("<generated>");
+}
+
 /* Input charset configuration.  */
 static const char *default_charset_callback (const char *)
 {
@@ -49,33 +55,87 @@ file_cache::initialize_input_context (diagnostic_input_charset_callback ccb,
   in_context.should_skip_bom = should_skip_bom;
 }
 
-/* This is a cache used by get_next_line to store the content of a
-   file to be searched for file lines.  */
-class file_cache_slot
+/* This is an abstract interface for a class that provides data which we want to
+   look up by line number.  Concrete implementations will follow, which handle
+   the cases of reading the data from the input source files, or of reading it
+   from in-memory generated data buffers.  The design is driven with reading
+   from files in mind, in particular it is desirable to read only as much of a
+   file from disk as necessary.  It works like a simplified std::istream, i.e.
+   virtual function calls are only needed when we need to retrieve more data
+   from the underlying source.  */
+
+class cache_data_source
 {
+
 public:
-  file_cache_slot ();
-  ~file_cache_slot ();
-
-  bool read_line_num (size_t line_num,
-		      char ** line, ssize_t *line_len);
-
-  /* Accessors.  */
-  const char *get_file_path () const { return m_file_path; }
+  bool read_line_num (size_t line_num, const char **line, ssize_t *line_len);
   unsigned get_use_count () const { return m_use_count; }
+  void inc_use_count () { m_use_count++; }
+  bool get_next_line (const char **line, ssize_t *line_len);
+  bool goto_next_line ();
   bool missing_trailing_newline_p () const
   {
     return m_missing_trailing_newline;
   }
+  bool unused () const { return !m_data_begin; }
+  virtual void reset ();
 
-  void inc_use_count () { m_use_count++; }
+protected:
+  cache_data_source ();
+  virtual ~cache_data_source ();
 
-  bool create (const file_cache::input_context &in_context,
-	       const char *file_path, FILE *fp, unsigned highest_use_count);
-  void evict ();
+  /* These pointers delimit the data that we are processing.  They are
+     maintained by the derived classes, we only ask for more by calling
+     get_more_data().  That function should return TRUE if more data was
+     obtained.  Calling get_more_data () may invalidate these pointers
+     (i.e. reallocating them to a larger buffer).  */
+  const char *m_data_begin;
+  const char *m_data_end;
+  virtual bool get_more_data () = 0;
 
- private:
-  /* These are information used to store a line boundary.  */
+  /* This is to be called by the derived classes when this object is
+     being activated.  */
+  void on_create (unsigned int use_count, size_t total_lines)
+  {
+    m_use_count = use_count;
+    m_total_lines = total_lines;
+  }
+
+private:
+  /* Non-copyable.  */
+  cache_data_source (const cache_data_source &) = delete;
+  cache_data_source& operator= (const cache_data_source &) = delete;
+
+  /* The number of times this data has been accessed.  This is used to designate
+     which entry to evict from the cache array when needed.  */
+  unsigned m_use_count;
+
+  /* Could this file be missing a trailing newline on its final line?
+     Initially true (to cope with empty files), set to true/false
+     as each line is read.  */
+  bool m_missing_trailing_newline;
+
+  /* This is the total number of lines in the current data.  At the
+     moment, we try to get this information from the line map
+     subsystem.  Note that this is just a hint.  When using the C++
+     front-end, this hint is correct because the input file is then
+     completely tokenized before parsing starts; so the line map knows
+     the number of lines before compilation really starts.  For e.g,
+     the C front-end, it can happen that we start emitting diagnostics
+     before the line map has seen the end of the file.  */
+  size_t m_total_lines;
+
+  /* The number of the previous lines read.  This starts at 1.  Zero
+     means we've read no line so far.  */
+  size_t m_line_num;
+
+  /* The index of the beginning of the current line.  */
+  size_t m_line_start_idx;
+
+  /* These are information used to store a line boundary.  Here and below, we
+     store always byte offsets, not pointers, since the underlying buffer may be
+     reallocated by the derived implementation unbeknownst to us after calling
+     get_more_data().  */
   class line_info
   {
   public:
@@ -83,13 +143,12 @@ public:
     size_t line_num;
 
     /* The position (byte count) of the beginning of the line,
-       relative to the file data pointer.  This starts at zero.  */
+       relative to M_DATA_BEGIN.  This starts at zero.  */
     size_t start_pos;
 
-    /* The position (byte count) of the last byte of the line.  This
-       normally points to the '\n' character, or to one byte after the
-       last byte of the file, if the file doesn't contain a '\n'
-       character.  */
+    /* The position (byte count) of the last byte of the line.  This normally
+       points to the '\n' character, or to M_DATA_END, if the data doesn't end
+       with a '\n' character.  */
     size_t end_pos;
 
     line_info (size_t l, size_t s, size_t e)
@@ -97,91 +156,76 @@ public:
     {}
 
     line_info ()
-      :line_num (0), start_pos (0), end_pos (0)
+      : line_num (0), start_pos (0), end_pos (0)
     {}
   };
 
-  bool needs_read_p () const;
-  bool needs_grow_p () const;
-  void maybe_grow ();
-  bool read_data ();
-  bool maybe_read_data ();
-  bool get_next_line (char **line, ssize_t *line_len);
-  bool read_next_line (char ** line, ssize_t *line_len);
-  bool goto_next_line ();
-
-  static const size_t buffer_size = 4 * 1024;
-  static const size_t line_record_size = 100;
-
-  /* The number of time this file has been accessed.  This is used
-     to designate which file cache to evict from the cache
-     array.  */
-  unsigned m_use_count;
-
-  /* The file_path is the key for identifying a particular file in
-     the cache.
-     For libcpp-using code, the underlying buffer for this field is
-     owned by the corresponding _cpp_file within the cpp_reader.  */
-  const char *m_file_path;
-
-  FILE *m_fp;
-
-  /* This points to the content of the file that we've read so
-     far.  */
-  char *m_data;
-
-  /* The allocated buffer to be freed may start a little earlier than DATA,
-     e.g. if a UTF8 BOM was skipped at the beginning.  */
-  int m_alloc_offset;
-
-  /*  The size of the DATA array above.*/
-  size_t m_size;
-
-  /* The number of bytes read from the underlying file so far.  This
-     must be less (or equal) than SIZE above.  */
-  size_t m_nb_read;
-
-  /* The index of the beginning of the current line.  */
-  size_t m_line_start_idx;
-
-  /* The number of the previous line read.  This starts at 1.  Zero
-     means we've read no line so far.  */
-  size_t m_line_num;
-
-  /* This is the total number of lines of the current file.  At the
-     moment, we try to get this information from the line map
-     subsystem.  Note that this is just a hint.  When using the C++
-     front-end, this hint is correct because the input file is then
-     completely tokenized before parsing starts; so the line map knows
-     the number of lines before compilation really starts.  For e.g,
-     the C front-end, it can happen that we start emitting diagnostics
-     before the line map has seen the end of the file.  */
-  size_t m_total_lines;
-
-  /* Could this file be missing a trailing newline on its final line?
-     Initially true (to cope with empty files), set to true/false
-     as each line is read.  */
-  bool m_missing_trailing_newline;
-
   /* This is a record of the beginning and end of the lines we've seen
      while reading the file.  This is useful to avoid walking the data
      from the beginning when we are asked to read a line that is
-     before LINE_START_IDX above.  Note that the maximum size of this
+     before M_LINE_START_IDX.  Note that the maximum size of this
      record is line_record_size, so that the memory consumption
      doesn't explode.  We thus scale total_lines down to
      line_record_size.  */
   vec<line_info, va_heap> m_line_record;
+  static const size_t line_record_size = 100;
+};
 
-  void offset_buffer (int offset)
+/* This is the implementation of cache_data_source for ordinary
+   source files.  */
+class file_cache_slot final : public cache_data_source
+{
+
+public:
+  file_cache_slot ();
+  ~file_cache_slot ();
+
+  const char *get_file_path () const { return m_file_path; }
+  bool create (const file_cache::input_context &in_context,
+	       const char *file_path, FILE *fp, unsigned highest_use_count);
+  void reset () override;
+
+protected:
+  bool get_more_data () override;
+
+private:
+  /* The file_path is the key for identifying a particular file in the cache.
+     For libcpp-using code, the underlying buffer for this field is owned by the
+     corresponding _cpp_file within the cpp_reader.  */
+  const char *m_file_path;
+
+  FILE *m_fp;
+
+  /* The base class M_DATA_BEGIN and M_DATA_END delimit the bytes that are ready
+     to process.  These two pointers here track a growable memory buffer, owned
+     by this object, where we store data as we read it from the file; we arrange
+     for the base class pointers to point to the right place within this
+     buffer.  */
+  char *m_buf_begin;
+  char *m_buf_end;
+  void maybe_grow ();
+};
+
+/* This is the implementation of cache_data_source for generated
+   data that is already in memory.  */
+class data_cache_slot final : public cache_data_source
+{
+public:
+  void create (const char *data, unsigned int data_len,
+	       unsigned int highest_use_count);
+  bool represents_data (const char *data, unsigned int) const
   {
-    gcc_assert (offset < 0 ? m_alloc_offset + offset >= 0
-		: (size_t) offset <= m_size);
-    gcc_assert (m_data);
-    m_alloc_offset += offset;
-    m_data += offset;
-    m_size -= offset;
+    /* We can just use pointer equality here since the generated data lives in
+       memory in one persistent place.  It isn't anticipated there would be
+       several generated data buffers with the same content, so we don't mind
+       that in such a case we will store it twice.  */
+    return m_data_begin == data;
   }
 
+protected:
+  /* In contrast to file_cache_slot, we do not own a buffer.  The buffer
+     passed to create() needs to outlive this object.  */
+  bool get_more_data () override { return false; }
 };
 
 /* Current position in real source file.  */
@@ -282,6 +326,8 @@ expand_location_1 (location_t loc,
   xloc.data = block;
   if (loc <= BUILTINS_LOCATION)
     xloc.file = loc == UNKNOWN_LOCATION ? NULL : special_fname_builtin ();
+  else if (xloc.generated_data_len)
+    xloc.file = special_fname_generated ();
 
   return xloc;
 }
@@ -316,11 +362,12 @@ diagnostic_file_cache_fini (void)
    equals the actual number of lines of the file.  */
 
 static size_t
-total_lines_num (const char *file_path)
+total_lines_num (const char *fname_or_data, bool is_data)
 {
   size_t r = 0;
   location_t l = 0;
-  if (linemap_get_file_highest_location (line_table, file_path, &l))
+  if (linemap_get_file_highest_location (line_table, fname_or_data,
+					 is_data, &l))
     {
       gcc_assert (l >= RESERVED_LOCATION_COUNT);
       expanded_location xloc = expand_location (l);
@@ -356,6 +403,21 @@ file_cache::lookup_file (const char *file_path)
   return r;
 }
 
+data_cache_slot *
+file_cache::lookup_data (const char *data, unsigned int data_len)
+{
+  for (unsigned int i = 0; i != num_file_slots; ++i)
+    {
+      const auto slot = m_data_slots + i;
+      if (slot->represents_data (data, data_len))
+	{
+	  slot->inc_use_count ();
+	  return slot;
+	}
+    }
+  return nullptr;
+}
+
 /* Purge any mention of FILENAME from the cache of files used for
    printing source code.  For use in selftests when working
    with tempfiles.  */
@@ -371,6 +433,15 @@ diagnostics_file_cache_forcibly_evict_file (const char *file_path)
   global_dc->m_file_cache->forcibly_evict_file (file_path);
 }
 
+void
+diagnostics_file_cache_forcibly_evict_data (const char *data,
+					    unsigned int data_len)
+{
+  if (!global_dc->m_file_cache)
+    return;
+  global_dc->m_file_cache->forcibly_evict_data (data, data_len);
+}
+
 void
 file_cache::forcibly_evict_file (const char *file_path)
 {
@@ -381,55 +452,39 @@ file_cache::forcibly_evict_file (const char *file_path)
     /* Not found.  */
     return;
 
-  r->evict ();
+  r->reset ();
 }
 
 void
-file_cache_slot::evict ()
+file_cache::forcibly_evict_data (const char *data, unsigned int data_len)
 {
-  m_file_path = NULL;
-  if (m_fp)
-    fclose (m_fp);
-  m_fp = NULL;
-  m_nb_read = 0;
-  m_line_start_idx = 0;
-  m_line_num = 0;
-  m_line_record.truncate (0);
-  m_use_count = 0;
-  m_total_lines = 0;
-  m_missing_trailing_newline = true;
+  if (auto r = lookup_data (data, data_len))
+    r->reset ();
 }
 
-/* Return the file cache that has been less used, recently, or the
+/* Return the cache that has been less used, recently, or the
    first empty one.  If HIGHEST_USE_COUNT is non-null,
    *HIGHEST_USE_COUNT is set to the highest use count of the entries
    in the cache table.  */
 
-file_cache_slot*
-file_cache::evicted_cache_tab_entry (unsigned *highest_use_count)
+template <class Slot>
+Slot *
+file_cache::evicted_cache_tab_entry (Slot *slots,
+				     unsigned int *highest_use_count)
 {
-  diagnostic_file_cache_init ();
-
-  file_cache_slot *to_evict = &m_file_slots[0];
+  auto to_evict = &slots[0];
   unsigned huc = to_evict->get_use_count ();
   for (unsigned i = 1; i < num_file_slots; ++i)
     {
-      file_cache_slot *c = &m_file_slots[i];
-      bool c_is_empty = (c->get_file_path () == NULL);
-
+      auto c = &slots[i];
       if (c->get_use_count () < to_evict->get_use_count ()
-	  || (to_evict->get_file_path () && c_is_empty))
+	  || (!to_evict->unused () && c->unused ()))
 	/* We evict C because it's either an entry with a lower use
 	   count or one that is empty.  */
 	to_evict = c;
 
       if (huc < c->get_use_count ())
 	huc = c->get_use_count ();
-
-      if (c_is_empty)
-	/* We've reached the end of the cache; subsequent elements are
-	   all empty.  */
-	break;
     }
 
   if (highest_use_count)
@@ -453,12 +508,23 @@ file_cache::add_file (const char *file_path)
     return NULL;
 
   unsigned highest_use_count = 0;
-  file_cache_slot *r = evicted_cache_tab_entry (&highest_use_count);
+  file_cache_slot *r = evicted_cache_tab_entry (m_file_slots,
+						&highest_use_count);
   if (!r->create (in_context, file_path, fp, highest_use_count))
     return NULL;
   return r;
 }
 
+data_cache_slot *
+file_cache::add_data (const char *data, unsigned int data_len)
+{
+  unsigned int highest_use_count = 0;
+  data_cache_slot *r = evicted_cache_tab_entry (m_data_slots,
+						&highest_use_count);
+  r->create (data, data_len, highest_use_count);
+  return r;
+}
+
 /* Populate this slot for use on FILE_PATH and FP, dropping any
    existing cached content within it.  */
 
@@ -467,22 +533,12 @@ file_cache_slot::create (const file_cache::input_context &in_context,
 			 const char *file_path, FILE *fp,
 			 unsigned highest_use_count)
 {
+  reset ();
+  on_create (highest_use_count + 1, total_lines_num (file_path, false));
+  m_data_begin = m_buf_begin;
+  m_data_end = m_buf_begin;
   m_file_path = file_path;
-  if (m_fp)
-    fclose (m_fp);
   m_fp = fp;
-  if (m_alloc_offset)
-    offset_buffer (-m_alloc_offset);
-  m_nb_read = 0;
-  m_line_start_idx = 0;
-  m_line_num = 0;
-  m_line_record.truncate (0);
-  /* Ensure that this cache entry doesn't get evicted next time
-     add_file_to_cache_tab is called.  */
-  m_use_count = ++highest_use_count;
-  m_total_lines = total_lines_num (file_path);
-  m_missing_trailing_newline = true;
-
 
   /* Check the input configuration to determine if we need to do any
      transformations, such as charset conversion or BOM skipping.  */
@@ -495,29 +551,37 @@ file_cache_slot::create (const file_cache::input_context &in_context,
 	= cpp_get_converted_source (file_path, input_charset);
       if (!cs.data)
 	return false;
-      if (m_data)
-	XDELETEVEC (m_data);
-      m_data = cs.data;
-      m_nb_read = m_size = cs.len;
-      m_alloc_offset = cs.data - cs.to_free;
+      XDELETEVEC (m_buf_begin);
+      m_buf_begin = cs.to_free;
+      m_buf_end = cs.data + cs.len;
+      m_data_begin = cs.data;
+      m_data_end = m_buf_end;
     }
-  else if (in_context.should_skip_bom)
+  else if (in_context.should_skip_bom && get_more_data ())
     {
-      if (read_data ())
-	{
-	  const int offset = cpp_check_utf8_bom (m_data, m_nb_read);
-	  offset_buffer (offset);
-	  m_nb_read -= offset;
-	}
+      const int offset = cpp_check_utf8_bom (m_data_begin,
+					     m_data_end - m_data_begin);
+      m_data_begin += offset;
     }
 
   return true;
 }
 
+void
+data_cache_slot::create (const char *data, unsigned int data_len,
+			 unsigned int highest_use_count)
+{
+  reset ();
+  on_create (highest_use_count + 1, total_lines_num (data, true));
+  m_data_begin = data;
+  m_data_end = data + data_len;
+}
+
 /* file_cache's ctor.  */
 
 file_cache::file_cache ()
-: m_file_slots (new file_cache_slot[num_file_slots])
+  : m_file_slots (new file_cache_slot[num_file_slots]),
+    m_data_slots (new data_cache_slot[num_file_slots])
 {
   initialize_input_context (nullptr, false);
 }
@@ -526,6 +590,7 @@ file_cache::file_cache ()
 
 file_cache::~file_cache ()
 {
+  delete[] m_data_slots;
   delete[] m_file_slots;
 }
 
@@ -543,55 +608,69 @@ file_cache::lookup_or_add_file (const char *file_path)
   return r;
 }
 
-/* Default constructor for a cache of file used by caret
-   diagnostic.  */
+data_cache_slot *
+file_cache::lookup_or_add_data (const char *data, unsigned int data_len)
+{
+  data_cache_slot *r = lookup_data (data, data_len);
+  if (!r)
+    r = add_data (data, data_len);
+  return r;
+}
 
-file_cache_slot::file_cache_slot ()
-: m_use_count (0), m_file_path (NULL), m_fp (NULL), m_data (0),
-  m_alloc_offset (0), m_size (0), m_nb_read (0), m_line_start_idx (0),
-  m_line_num (0), m_total_lines (0), m_missing_trailing_newline (true)
+cache_data_source::cache_data_source ()
+: m_data_begin (nullptr), m_data_end (nullptr),
+  m_use_count (0),
+  m_missing_trailing_newline (true),
+  m_total_lines (0),
+  m_line_num (0),
+  m_line_start_idx (0)
 {
   m_line_record.create (0);
 }
 
-/* Destructor for a cache of file used by caret diagnostic.  */
-
-file_cache_slot::~file_cache_slot ()
+cache_data_source::~cache_data_source ()
 {
-  if (m_fp)
-    {
-      fclose (m_fp);
-      m_fp = NULL;
-    }
-  if (m_data)
-    {
-      offset_buffer (-m_alloc_offset);
-      XDELETEVEC (m_data);
-      m_data = 0;
-    }
   m_line_record.release ();
 }
 
-/* Returns TRUE iff the cache would need to be filled with data coming
-   from the file.  That is, either the cache is empty or full or the
-   current line is empty.  Note that if the cache is full, it would
-   need to be extended and filled again.  */
-
-bool
-file_cache_slot::needs_read_p () const
+void
+cache_data_source::reset ()
 {
-  return m_fp && (m_nb_read == 0
-	  || m_nb_read == m_size
-	  || (m_line_start_idx >= m_nb_read - 1));
+  m_data_begin = nullptr;
+  m_data_end = nullptr;
+  m_use_count = 0;
+  m_missing_trailing_newline = true;
+  m_total_lines = 0;
+  m_line_num = 0;
+  m_line_start_idx = 0;
+  m_line_record.truncate (0);
 }
 
-/*  Return TRUE iff the cache is full and thus needs to be
-    extended.  */
+file_cache_slot::file_cache_slot ()
+: m_file_path (nullptr), m_fp (nullptr),
+  m_buf_begin (nullptr), m_buf_end (nullptr)
+{}
 
-bool
-file_cache_slot::needs_grow_p () const
+file_cache_slot::~file_cache_slot ()
 {
-  return m_nb_read == m_size;
+  if (m_fp)
+    fclose (m_fp);
+  XDELETEVEC (m_buf_begin);
+}
+
+void
+file_cache_slot::reset ()
+{
+  cache_data_source::reset ();
+  m_file_path = NULL;
+  if (m_fp)
+    {
+      fclose (m_fp);
+      m_fp = NULL;
+    }
+
+  /* Do not free the buffer here, we intend to reuse it the next time this
+     slot is activated.  */
 }
 
 /* Grow the cache if it needs to be extended.  */
@@ -599,22 +678,23 @@ file_cache_slot::needs_grow_p () const
 void
 file_cache_slot::maybe_grow ()
 {
-  if (!needs_grow_p ())
-    return;
-
-  if (!m_data)
+  if (!m_buf_begin)
     {
-      gcc_assert (m_size == 0 && m_alloc_offset == 0);
-      m_size = buffer_size;
-      m_data = XNEWVEC (char, m_size);
+      const size_t buffer_size = 4 * 1024;
+      m_buf_begin = XNEWVEC (char, buffer_size);
+      m_buf_end = m_buf_begin + buffer_size;
+      m_data_begin = m_buf_begin;
+      m_data_end = m_data_begin;
     }
-  else
+  else if (m_data_end == m_buf_end)
     {
-      const int offset = m_alloc_offset;
-      offset_buffer (-offset);
-      m_size *= 2;
-      m_data = XRESIZEVEC (char, m_data, m_size);
-      offset_buffer (offset);
+      const auto new_size = 2 * (m_buf_end - m_buf_begin);
+      const auto data_offset = m_data_begin - m_buf_begin;
+      const auto data_size = m_data_end - m_data_begin;
+      m_buf_begin = XRESIZEVEC (char, m_buf_begin, new_size);
+      m_buf_end = m_buf_begin + new_size;
+      m_data_begin = m_buf_begin + data_offset;
+      m_data_end = m_data_begin + data_size;
     }
 }
 
@@ -622,45 +702,28 @@ file_cache_slot::maybe_grow ()
     Returns TRUE iff new data could be read.  */
 
 bool
-file_cache_slot::read_data ()
+file_cache_slot::get_more_data ()
 {
-  if (feof (m_fp) || ferror (m_fp))
+  if (!m_fp || feof (m_fp) || ferror (m_fp))
     return false;
-
   maybe_grow ();
-
-  char * from = m_data + m_nb_read;
-  size_t to_read = m_size - m_nb_read;
-  size_t nb_read = fread (from, 1, to_read, m_fp);
-
-  if (ferror (m_fp))
-    return false;
-
-  m_nb_read += nb_read;
-  return !!nb_read;
-}
-
-/* Read new data iff the cache needs to be filled with more data
-   coming from the file FP.  Return TRUE iff the cache was filled with
-   mode data.  */
-
-bool
-file_cache_slot::maybe_read_data ()
-{
-  if (!needs_read_p ())
+  char *const dest = m_buf_begin + (m_data_end - m_buf_begin);
+  const auto nb_read = fread (dest, 1, m_buf_end - dest, m_fp);
+  if (ferror (m_fp) || !nb_read)
     return false;
-  return read_data ();
+  m_data_end += nb_read;
+  return true;
 }
 
-/* Helper function for file_cache_slot::get_next_line (), to find the end of
+/* Helper function for cache_data_source::get_next_line (), to find the end of
    the next line.  Returns with the memchr convention, i.e. nullptr if a line
    terminator was not found.  We need to determine line endings in the same
    manner that libcpp does: any of \n, \r\n, or \r is a line ending.  */
 
-static char *
-find_end_of_line (char *s, size_t len)
+static const char *
+find_end_of_line (const char *s, const char *end)
 {
-  for (const auto end = s + len; s != end; ++s)
+  for (; s != end; ++s)
     {
       if (*s == '\n')
 	return s;
@@ -683,41 +746,38 @@ find_end_of_line (char *s, size_t len)
   return nullptr;
 }
 
-/* Read a new line from file FP, using C as a cache for the data
-   coming from the file.  Upon successful completion, *LINE is set to
-   the beginning of the line found.  *LINE points directly in the
-   line cache and is only valid until the next call of get_next_line.
-   *LINE_LEN is set to the length of the line.  Note that the line
-   does not contain any terminal delimiter.  This function returns
-   true if some data was read or process from the cache, false
-   otherwise.  Note that subsequent calls to get_next_line might
-   make the content of *LINE invalid.  */
+/* Read a new line from the data source.  Upon successful completion, *LINE is
+   set to the beginning of the line found.  *LINE points directly in the line
+   cache and is only valid until the next call of get_next_line.  *LINE_LEN is
+   set to the length of the line.  Note that the line does not contain any
+   terminal delimiter.  This function returns true if some data was read or
+   processed from the cache, false otherwise.  Note that subsequent calls to
+   get_next_line might make the content of *LINE invalid.  */
 
 bool
-file_cache_slot::get_next_line (char **line, ssize_t *line_len)
+cache_data_source::get_next_line (const char **line, ssize_t *line_len)
 {
-  /* Fill the cache with data to process.  */
-  maybe_read_data ();
+  const char *line_start = m_data_begin + m_line_start_idx;
 
-  size_t remaining_size = m_nb_read - m_line_start_idx;
-  if (remaining_size == 0)
-    /* There is no more data to process.  */
-    return false;
+  /* Check if we are all done reading the file.  */
+  if (line_start == m_data_end)
+    {
+      if (!get_more_data ())
+	return false;
+      line_start = m_data_begin + m_line_start_idx;
+    }
 
-  char *line_start = m_data + m_line_start_idx;
-
-  char *next_line_start = NULL;
-  size_t len = 0;
-  char *line_end = find_end_of_line (line_start, remaining_size);
+  /* Find the end of the current line.  */
+  const char *next_line_start = NULL;
+  const char *line_end = find_end_of_line (line_start, m_data_end);
   if (line_end == NULL)
     {
       /* We haven't found an end-of-line delimiter in the cache.
 	 Fill the cache with more data from the file and look again.  */
-      while (maybe_read_data ())
+      while (get_more_data ())
 	{
-	  line_start = m_data + m_line_start_idx;
-	  remaining_size = m_nb_read - m_line_start_idx;
-	  line_end = find_end_of_line (line_start, remaining_size);
+	  line_start = m_data_begin + m_line_start_idx;
+	  line_end = find_end_of_line (line_start, m_data_end);
 	  if (line_end != NULL)
 	    {
 	      next_line_start = line_end + 1;
@@ -734,8 +794,8 @@ file_cache_slot::get_next_line (char **line, ssize_t *line_len)
 
 	     If the file ends in a \r, we didn't identify it as a line
 	     terminator above, so do that now instead.  */
-	  line_end = m_data + m_nb_read;
-	  if (m_nb_read && line_end[-1] == '\r')
+	  line_end = m_data_end;
+	  if (line_end != m_data_begin && line_end[-1] == '\r')
 	    {
 	      --line_end;
 	      m_missing_trailing_newline = false;
@@ -752,18 +812,11 @@ file_cache_slot::get_next_line (char **line, ssize_t *line_len)
       m_missing_trailing_newline = false;
     }
 
-  if (m_fp && ferror (m_fp))
-    return false;
-
   /* At this point, we've found the end of the of line.  It either points to
      the line terminator or to one byte after the last byte of the file.  */
-  gcc_assert (line_end != NULL);
-
-  len = line_end - line_start;
-
-  if (m_line_start_idx < m_nb_read)
-    *line = line_start;
-
+  const auto len = line_end - line_start;
+  *line = line_start;
+  *line_len = len;
   ++m_line_num;
 
   /* Before we update our line record, make sure the hint about the
@@ -785,7 +838,7 @@ file_cache_slot::get_next_line (char **line, ssize_t *line_len)
 	m_line_record.safe_push
 	  (file_cache_slot::line_info (m_line_num,
 				       m_line_start_idx,
-				       line_end - m_data));
+				       line_end - m_data_begin));
       else if (m_total_lines > line_record_size)
 	{
 	  /* ... otherwise, we just scale total_lines down to
@@ -796,23 +849,14 @@ file_cache_slot::get_next_line (char **line, ssize_t *line_len)
 	    m_line_record.safe_push
 	      (file_cache_slot::line_info (m_line_num,
 					   m_line_start_idx,
-					   line_end - m_data));
+					   line_end - m_data_begin));
 	}
     }
 
   /* Update m_line_start_idx so that it points to the next line to be
      read.  */
-  if (next_line_start)
-    m_line_start_idx = next_line_start - m_data;
-  else
-    /* We didn't find any terminal '\n'.  Let's consider that the end
-       of line is the end of the data in the cache.  The next
-       invocation of get_next_line will either read more data from the
-       underlying file or return false early because we've reached the
-       end of the file.  */
-    m_line_start_idx = m_nb_read;
-
-  *line_len = len;
+  m_line_start_idx
+    = (next_line_start ? next_line_start : m_data_end) - m_data_begin;
 
   return true;
 }
@@ -824,15 +868,15 @@ file_cache_slot::get_next_line (char **line, ssize_t *line_len)
    completion.  */
 
 bool
-file_cache_slot::goto_next_line ()
+cache_data_source::goto_next_line ()
 {
-  char *l;
+  const char *l;
   ssize_t len;
 
   return get_next_line (&l, &len);
 }
 
-/* Read an arbitrary line number LINE_NUM from the file cached in C.
+/* Read an arbitrary line number LINE_NUM from the data cache.
    If the line was read successfully, *LINE points to the beginning
    of the line in the file cache and *LINE_LEN is the length of the
    line.  *LINE is not nul-terminated, but may contain zero bytes.
@@ -840,8 +884,8 @@ file_cache_slot::goto_next_line ()
    This function returns bool if a line was read.  */
 
 bool
-file_cache_slot::read_line_num (size_t line_num,
-		       char ** line, ssize_t *line_len)
+cache_data_source::read_line_num (size_t line_num,
+				  const char ** line, ssize_t *line_len)
 {
   gcc_assert (line_num > 0);
 
@@ -849,7 +893,7 @@ file_cache_slot::read_line_num (size_t line_num,
     {
       /* We've been asked to read lines that are before m_line_num.
 	 So lets use our line record (if it's not empty) to try to
-	 avoid re-reading the file from the beginning again.  */
+	 avoid re-scanning the data from the beginning again.  */
 
       if (m_line_record.is_empty ())
 	{
@@ -858,7 +902,7 @@ file_cache_slot::read_line_num (size_t line_num,
 	}
       else
 	{
-	  file_cache_slot::line_info *i = NULL;
+	  line_info *i = NULL;
 	  if (m_total_lines <= line_record_size)
 	    {
 	      /* In languages where the input file is not totally
@@ -894,7 +938,7 @@ file_cache_slot::read_line_num (size_t line_num,
 	  if (i && i->line_num == line_num)
 	    {
 	      /* We have the start/end of the line.  */
-	      *line = m_data + i->start_pos;
+	      *line = m_data_begin + i->start_pos;
 	      *line_len = i->end_pos - i->start_pos;
 	      return true;
 	    }
@@ -931,30 +975,56 @@ file_cache_slot::read_line_num (size_t line_num,
    If the function fails, a NULL char_span is returned.  */
 
 char_span
-location_get_source_line (const char *file_path, int line)
+location_get_source_line (expanded_location xloc, int line)
 {
-  char *buffer = NULL;
-  ssize_t len;
-
+  const char_span fail (nullptr, 0);
   if (line == 0)
-    return char_span (NULL, 0);
-
-  if (file_path == NULL)
-    return char_span (NULL, 0);
+    return fail;
 
   diagnostic_file_cache_init ();
 
-  file_cache_slot *c = global_dc->m_file_cache->lookup_or_add_file (file_path);
-  if (c == NULL)
-    return char_span (NULL, 0);
+  cache_data_source *c;
+  if (xloc.generated_data_len)
+    {
+      if (!xloc.generated_data)
+	return fail;
+      c = global_dc->m_file_cache->lookup_or_add_data (xloc.generated_data,
+						       xloc.generated_data_len);
+    }
+  else
+    {
+      if (!xloc.file)
+	return fail;
+      c = global_dc->m_file_cache->lookup_or_add_file (xloc.file);
+    }
 
+  if (!c)
+    return fail;
+
+  const char *buffer = NULL;
+  ssize_t len;
   bool read = c->read_line_num (line, &buffer, &len);
   if (!read)
-    return char_span (NULL, 0);
+    return fail;
 
   return char_span (buffer, len);
 }
 
+char_span
+location_get_source_line (expanded_location xloc)
+{
+  return location_get_source_line (xloc, xloc.line);
+}
+
+char_span
+location_get_source_line (const char *file_path, int line)
+{
+  expanded_location xloc = {};
+  xloc.file = file_path;
+  xloc.line = line;
+  return location_get_source_line (xloc);
+}
+
 /* Return a NUL-terminated copy of the source text between two locations, or
    NULL if the arguments are invalid.  The caller is responsible for freeing
    the return value.  */
@@ -971,8 +1041,18 @@ get_source_text_between (location_t start, location_t end)
      start, give up and return nothing.  */
   if (!expstart.file || !expend.file)
     return NULL;
-  if (strcmp (expstart.file, expend.file) != 0)
+  if (expstart.generated_data_len != expend.generated_data_len)
     return NULL;
+  if (expstart.generated_data_len)
+    {
+      if (expstart.generated_data != expend.generated_data)
+	return NULL;
+    }
+  else
+    {
+      if (strcmp (expstart.file, expend.file) != 0)
+	return NULL;
+    }
   if (expstart.line > expend.line)
     return NULL;
   if (expstart.line == expend.line
@@ -1202,9 +1282,10 @@ int
 location_compute_display_column (expanded_location exploc,
 				 const cpp_char_column_policy &policy)
 {
-  if (!(exploc.file && *exploc.file && exploc.line && exploc.column))
+  if (!(exploc.file && (exploc.generated_data_len || *exploc.file)
+	&& exploc.line && exploc.column))
     return exploc.column;
-  char_span line = location_get_source_line (exploc.file, exploc.line);
+  char_span line = location_get_source_line (exploc);
   /* If line is NULL, this function returns exploc.column which is the
      desired fallback.  */
   return cpp_byte_column_to_display_column (line.get_buffer (), line.length (),
@@ -1364,7 +1445,19 @@ dump_location_info (FILE *stream)
       fprintf (stream, "ORDINARY MAP: %i\n", idx);
       dump_location_range (stream,
 			   MAP_START_LOCATION (map), end_location);
-      fprintf (stream, "  file: %s\n", ORDINARY_MAP_FILE_NAME (map));
+
+      if (ORDINARY_MAP_GENERATED_DATA_P (map))
+	{
+	  fprintf (stream, "  file: %s%s\n",
+		   ORDINARY_MAP_CONTAINING_FILE_NAME (line_table, map),
+		   special_fname_generated ());
+	  fprintf (stream, "  data: %.*s\n",
+		   (int) ORDINARY_MAP_GENERATED_DATA_LEN (map),
+		   ORDINARY_MAP_GENERATED_DATA (map));
+	}
+      else
+	fprintf (stream, "  file: %s\n", LINEMAP_FILE (map));
+
       fprintf (stream, "  starting at line: %i\n",
 	       ORDINARY_MAP_STARTING_LINE_NUMBER (map));
       fprintf (stream, "  column and range bits: %i\n",
@@ -1390,6 +1483,9 @@ dump_location_info (FILE *stream)
       case LC_ENTER_MACRO:
 	reason = "LC_RENAME_MACRO";
 	break;
+      case LC_GEN:
+	reason = "LC_GEN";
+	break;
       default:
 	reason = "Unknown";
       }
@@ -1419,13 +1515,14 @@ dump_location_info (FILE *stream)
 	    {
 	      /* Beginning of a new source line: draw the line.  */
 
-	      char_span line_text = location_get_source_line (exploc.file,
-							      exploc.line);
+	      char_span line_text = location_get_source_line (exploc);
 	      if (!line_text)
 		break;
 	      fprintf (stream,
-		       "%s:%3i|loc:%5i|%.*s\n",
-		       exploc.file, exploc.line,
+		       "%s%s:%3i|loc:%5i|%.*s\n",
+		       exploc.file,
+		       exploc.generated_data ? special_fname_generated () : "",
+		       exploc.line,
 		       loc,
 		       (int)line_text.length (), line_text.get_buffer ());
 
@@ -1740,14 +1837,17 @@ get_substring_ranges_for_loc (cpp_reader *pfile,
       expanded_location finish
 	= expand_location_to_spelling_point (src_range.m_finish,
 					     LOCATION_ASPECT_FINISH);
-      if (start.file != finish.file)
+      if (start.generated_data_len != finish.generated_data_len
+	  || (start.generated_data_len
+	      ? start.generated_data != finish.generated_data
+	      : start.file != finish.file))
 	return "range endpoints are in different files";
       if (start.line != finish.line)
 	return "range endpoints are on different lines";
       if (start.column > finish.column)
 	return "range endpoints are reversed";
 
-      char_span line = location_get_source_line (start.file, start.line);
+      char_span line = location_get_source_line (start);
       if (!line)
 	return "unable to read source line";
 
@@ -1787,11 +1887,13 @@ get_substring_ranges_for_loc (cpp_reader *pfile,
       /* Bulletproofing.  We ought to only have different ordinary maps
 	 for start vs finish due to line-length jumps.  */
       if (start_ord_map != final_ord_map
-	  && start_ord_map->to_file != final_ord_map->to_file)
+	  && !ORDINARY_MAPS_SAME_FILE_P (start_ord_map, final_ord_map))
 	return "start and finish are spelled in different ordinary maps";
       /* The file from linemap_resolve_location ought to match that from
 	 expand_location_to_spelling_point.  */
-      if (start_ord_map->to_file != start.file)
+      if (ORDINARY_MAP_GENERATED_DATA_P (start_ord_map)
+	  ? ORDINARY_MAP_GENERATED_DATA (start_ord_map) != start.generated_data
+	  : ORDINARY_MAP_FILE_NAME (start_ord_map) != start.file)
 	return "mismatching file after resolving linemap";
 
       location_t start_loc
@@ -1963,6 +2065,20 @@ get_num_source_ranges_for_substring (cpp_reader *pfile,
 
 /* Selftests of location handling.  */
 
+/* Wrapper around linemap_add to handle transparently adding either a tmp file,
+   or in-memory generated content.  */
+const line_map_ordinary *
+temp_source_file::do_linemap_add (int line)
+{
+  const line_map *map;
+  if (content_buf)
+    map = linemap_add (line_table, LC_GEN, false, content_buf,
+		       line, content_len);
+  else
+    map = linemap_add (line_table, LC_ENTER, false, get_filename (), line);
+  return linemap_check_ordinary (map);
+}
+
 /* Verify that compare() on linenum_type handles comparisons over the full
    range of the type.  */
 
@@ -2041,13 +2157,16 @@ assert_loceq (const char *exp_filename, int exp_linenum, int exp_colnum,
 class line_table_case
 {
 public:
-  line_table_case (int default_range_bits, int base_location)
+  line_table_case (int default_range_bits, int base_location,
+		   bool generated_data)
   : m_default_range_bits (default_range_bits),
-    m_base_location (base_location)
+    m_base_location (base_location),
+    m_generated_data (generated_data)
   {}
 
   int m_default_range_bits;
   int m_base_location;
+  bool m_generated_data;
 };
 
 /* Constructor.  Store the old value of line_table, and create a new
@@ -2064,6 +2183,7 @@ line_table_test::line_table_test ()
   gcc_assert (saved_line_table->round_alloc_size);
   line_table->round_alloc_size = saved_line_table->round_alloc_size;
   line_table->default_range_bits = 0;
+  m_generated_data = false;
 }
 
 /* Constructor.  Store the old value of line_table, and create a new
@@ -2085,6 +2205,7 @@ line_table_test::line_table_test (const line_table_case &case_)
       line_table->highest_location = case_.m_base_location;
       line_table->highest_line = case_.m_base_location;
     }
+  m_generated_data = case_.m_generated_data;
 }
 
 /* Destructor.  Restore the old value of line_table.  */
@@ -2104,7 +2225,10 @@ test_accessing_ordinary_linemaps (const line_table_case &case_)
   line_table_test ltt (case_);
 
   /* Build a simple linemap describing some locations. */
-  linemap_add (line_table, LC_ENTER, false, "foo.c", 0);
+  if (ltt.m_generated_data)
+    linemap_add (line_table, LC_GEN, false, "some data", 0, 10);
+  else
+    linemap_add (line_table, LC_ENTER, false, "foo.c", 0);
 
   linemap_line_start (line_table, 1, 100);
   location_t loc_a = linemap_position_for_column (line_table, 1);
@@ -2154,21 +2278,23 @@ test_accessing_ordinary_linemaps (const line_table_case &case_)
   linemap_add (line_table, LC_LEAVE, false, NULL, 0);
 
   /* Verify that we can recover the location info.  */
-  assert_loceq ("foo.c", 1, 1, loc_a);
-  assert_loceq ("foo.c", 1, 23, loc_b);
-  assert_loceq ("foo.c", 2, 1, loc_c);
-  assert_loceq ("foo.c", 2, 17, loc_d);
-  assert_loceq ("foo.c", 3, 700, loc_e);
-  assert_loceq ("foo.c", 4, 100, loc_back_to_short);
+  const auto fname
+    = (ltt.m_generated_data ? special_fname_generated () : "foo.c");
+  assert_loceq (fname, 1, 1, loc_a);
+  assert_loceq (fname, 1, 23, loc_b);
+  assert_loceq (fname, 2, 1, loc_c);
+  assert_loceq (fname, 2, 17, loc_d);
+  assert_loceq (fname, 3, 700, loc_e);
+  assert_loceq (fname, 4, 100, loc_back_to_short);
 
   /* In the very wide line, the initial location should be fully tracked.  */
-  assert_loceq ("foo.c", 5, 2000, loc_start_of_very_long_line);
+  assert_loceq (fname, 5, 2000, loc_start_of_very_long_line);
   /* ...but once we exceed LINE_MAP_MAX_COLUMN_NUMBER column-tracking should
      be disabled.  */
-  assert_loceq ("foo.c", 5, 0, loc_too_wide);
-  assert_loceq ("foo.c", 5, 0, loc_too_wide_2);
+  assert_loceq (fname, 5, 0, loc_too_wide);
+  assert_loceq (fname, 5, 0, loc_too_wide_2);
   /*...and column-tracking should be re-enabled for subsequent lines.  */
-  assert_loceq ("foo.c", 6, 10, loc_sane_again);
+  assert_loceq (fname, 6, 10, loc_sane_again);
 
   assert_loceq ("bar.c", 1, 150, loc_f);
 
@@ -2215,10 +2341,11 @@ test_make_location_nonpure_range_endpoints (const line_table_case &case_)
      with C++ frontend.
      ....................0000000001111111111222.
      ....................1234567890123456789012.  */
+  line_table_test ltt (case_);
   const char *content = "     r += !aaa == bbb;\n";
-  temp_source_file tmp (SELFTEST_LOCATION, ".C", content);
-  line_table_test ltt (case_);
-  linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
+  temp_source_file tmp (SELFTEST_LOCATION, ".C", content, strlen (content),
+			ltt.m_generated_data);
+  tmp.do_linemap_add (1);
 
   const location_t c11 = linemap_position_for_column (line_table, 11);
   const location_t c12 = linemap_position_for_column (line_table, 12);
@@ -3875,7 +4002,8 @@ static const location_t boundary_locations[] = {
 /* Run TESTCASE multiple times, once for each case in our test matrix.  */
 
 void
-for_each_line_table_case (void (*testcase) (const line_table_case &))
+for_each_line_table_case (void (*testcase) (const line_table_case &),
+			  bool test_generated_data)
 {
   /* As noted above in the description of struct line_table_case,
      we want to explore a test matrix of interesting line_table
@@ -3894,16 +4022,19 @@ for_each_line_table_case (void (*testcase) (const line_table_case &))
       const int num_boundary_locations = ARRAY_SIZE (boundary_locations);
       for (int loc_idx = 0; loc_idx < num_boundary_locations; loc_idx++)
 	{
-	  line_table_case c (default_range_bits, boundary_locations[loc_idx]);
-
-	  testcase (c);
-
-	  num_cases_tested++;
+	  /* ...and try both normal files, and internally generated data.  */
+	  for (int gen = 0; gen != 1+test_generated_data; ++gen)
+	    {
+	      line_table_case c (default_range_bits,
+				 boundary_locations[loc_idx], gen);
+	      testcase (c);
+	      num_cases_tested++;
+	    }
 	}
     }
 
   /* Verify that we fully covered the test matrix.  */
-  ASSERT_EQ (num_cases_tested, 2 * 12);
+  ASSERT_EQ (num_cases_tested, 2 * 12 * (1+test_generated_data));
 }
 
 /* Verify that when presented with a consecutive pair of locations with
@@ -3914,7 +4045,7 @@ for_each_line_table_case (void (*testcase) (const line_table_case &))
 static void
 test_line_offset_overflow ()
 {
-  line_table_test ltt (line_table_case (5, 0));
+  line_table_test ltt (line_table_case (5, 0, false));
 
   linemap_add (line_table, LC_ENTER, false, "foo.c", 0);
   linemap_line_start (line_table, 1, 100);
@@ -4057,9 +4188,9 @@ input_cc_tests ()
   test_should_have_column_data_p ();
   test_unknown_location ();
   test_builtins ();
-  for_each_line_table_case (test_make_location_nonpure_range_endpoints);
+  for_each_line_table_case (test_make_location_nonpure_range_endpoints, true);
 
-  for_each_line_table_case (test_accessing_ordinary_linemaps);
+  for_each_line_table_case (test_accessing_ordinary_linemaps, true);
   for_each_line_table_case (test_lexer);
   for_each_line_table_case (test_lexer_string_locations_simple);
   for_each_line_table_case (test_lexer_string_locations_ebcdic);
diff --git a/gcc/input.h b/gcc/input.h
index 2173a39a773..b81c5a9e71f 100644
--- a/gcc/input.h
+++ b/gcc/input.h
@@ -34,6 +34,7 @@ extern GTY(()) class line_maps *saved_line_table;
 
 /* Returns the translated string referring to the special location.  */
 const char *special_fname_builtin ();
+const char *special_fname_generated ();
 
 /* line-map.cc reserves RESERVED_LOCATION_COUNT to the user.  Ensure
    both UNKNOWN_LOCATION and BUILTINS_LOCATION fit into that.  */
@@ -114,13 +115,20 @@ class char_span
 };
 
 extern char_span location_get_source_line (const char *file_path, int line);
+
+/* The version taking an exploc handles generated source too, and should be used
+   whenever possible.  */
+extern char_span location_get_source_line (expanded_location exploc);
+extern char_span location_get_source_line (expanded_location exploc, int line);
+
 extern char *get_source_text_between (location_t, location_t);
 
 extern bool location_missing_trailing_newline (const char *file_path);
 
-/* Forward decl of slot within file_cache, so that the definition doesn't
+/* Forward decl of slots within file_cache, so that the definition doesn't
    need to be in this header.  */
 class file_cache_slot;
+class data_cache_slot;
 
 /* A cache of source files for use when emitting diagnostics
    (and in a few places in the C/C++ frontends).
@@ -138,7 +146,9 @@ class file_cache
   ~file_cache ();
 
   file_cache_slot *lookup_or_add_file (const char *file_path);
+  data_cache_slot *lookup_or_add_data (const char *data, unsigned int data_len);
   void forcibly_evict_file (const char *file_path);
+  void forcibly_evict_data (const char *data, unsigned int data_len);
 
   /* See comments in diagnostic.h about the input conversion context.  */
   struct input_context
@@ -150,13 +160,17 @@ class file_cache
 				 bool should_skip_bom);
 
  private:
-  file_cache_slot *evicted_cache_tab_entry (unsigned *highest_use_count);
+  template <class Slot>
+  Slot *evicted_cache_tab_entry (Slot *slots, unsigned int *highest_use_count);
+
   file_cache_slot *add_file (const char *file_path);
+  data_cache_slot *add_data (const char *data, unsigned int data_len);
   file_cache_slot *lookup_file (const char *file_path);
+  data_cache_slot *lookup_data (const char *data, unsigned int data_len);
 
- private:
   static const size_t num_file_slots = 16;
   file_cache_slot *m_file_slots;
+  data_cache_slot *m_data_slots;
   input_context in_context;
 };
 
@@ -253,6 +267,8 @@ void dump_location_info (FILE *stream);
 void diagnostics_file_cache_fini (void);
 
 void diagnostics_file_cache_forcibly_evict_file (const char *file_path);
+void diagnostics_file_cache_forcibly_evict_data (const char *data,
+						 unsigned int data_len);
 
 class GTY(()) string_concat
 {
diff --git a/gcc/selftest.cc b/gcc/selftest.cc
index 89abfba5e80..072933c1031 100644
--- a/gcc/selftest.cc
+++ b/gcc/selftest.cc
@@ -163,14 +163,21 @@ assert_str_startswith (const location &loc,
 
 named_temp_file::named_temp_file (const char *suffix)
 {
-  m_filename = make_temp_file (suffix);
-  ASSERT_NE (m_filename, NULL);
+  if (suffix)
+    {
+      m_filename = make_temp_file (suffix);
+      ASSERT_NE (m_filename, NULL);
+    }
+  else
+    m_filename = nullptr;
 }
 
 /* Destructor.  Delete the tempfile.  */
 
 named_temp_file::~named_temp_file ()
 {
+  if (!m_filename)
+    return;
   unlink (m_filename);
   diagnostics_file_cache_forcibly_evict_file (m_filename);
   free (m_filename);
@@ -183,7 +190,9 @@ named_temp_file::~named_temp_file ()
 temp_source_file::temp_source_file (const location &loc,
 				    const char *suffix,
 				    const char *content)
-: named_temp_file (suffix)
+: named_temp_file (suffix),
+  content_buf (nullptr),
+  content_len (0)
 {
   FILE *out = fopen (get_filename (), "w");
   if (!out)
@@ -192,19 +201,41 @@ temp_source_file::temp_source_file (const location &loc,
   fclose (out);
 }
 
-/* As above, but with a size, to allow for NUL bytes in CONTENT.  */
+/* As above, but with a size, to allow for NUL bytes in CONTENT.  When
+   IS_GENERATED==true, the data is kept in memory instead, for testing LC_GEN
+   maps.  */
 
 temp_source_file::temp_source_file (const location &loc,
 				    const char *suffix,
 				    const char *content,
-				    size_t sz)
-: named_temp_file (suffix)
+				    size_t sz,
+				    bool is_generated)
+: named_temp_file (is_generated ? nullptr : suffix),
+  content_buf (is_generated ? XNEWVEC (char, sz) : nullptr),
+  content_len (is_generated ? sz : 0)
 {
-  FILE *out = fopen (get_filename (), "w");
-  if (!out)
-    fail_formatted (loc, "unable to open tempfile: %s", get_filename ());
-  fwrite (content, sz, 1, out);
-  fclose (out);
+  if (is_generated)
+    {
+      gcc_assert (sz); /* Empty generated content is not supported.  */
+      memcpy (content_buf, content, sz);
+    }
+  else
+    {
+      FILE *out = fopen (get_filename (), "w");
+      if (!out)
+	fail_formatted (loc, "unable to open tempfile: %s", get_filename ());
+      fwrite (content, sz, 1, out);
+      fclose (out);
+    }
+}
+
+temp_source_file::~temp_source_file ()
+{
+  if (content_buf)
+    {
+      diagnostics_file_cache_forcibly_evict_data (content_buf, content_len);
+      XDELETEVEC (content_buf);
+    }
 }
 
 /* Avoid introducing locale-specific differences in the results
diff --git a/gcc/selftest.h b/gcc/selftest.h
index 7568a6d24d4..ab1c9025349 100644
--- a/gcc/selftest.h
+++ b/gcc/selftest.h
@@ -25,6 +25,8 @@ along with GCC; see the file COPYING3.  If not see
 
 #if CHECKING_P
 
+struct line_map_ordinary;
+
 namespace selftest {
 
 /* A struct describing the source-location of a selftest, to make it
@@ -96,10 +98,9 @@ extern void assert_str_startswith (const location &loc,
 class named_temp_file
 {
  public:
-  named_temp_file (const char *suffix);
+  explicit named_temp_file (const char *suffix);
   ~named_temp_file ();
   const char *get_filename () const { return m_filename; }
-
  private:
   char *m_filename;
 };
@@ -113,7 +114,13 @@ class temp_source_file : public named_temp_file
   temp_source_file (const location &loc, const char *suffix,
 		    const char *content);
   temp_source_file (const location &loc, const char *suffix,
-		    const char *content, size_t sz);
+		    const char *content, size_t sz,
+		    bool is_generated = false);
+  ~temp_source_file ();
+
+  char *const content_buf;
+  const size_t content_len;
+  const line_map_ordinary *do_linemap_add (int line); /* In input.cc */
 };
 
 /* RAII-style class for avoiding introducing locale-specific differences
@@ -171,6 +178,10 @@ class line_table_test
 
   /* Destructor.  Restore the saved line_table.  */
   ~line_table_test ();
+
+  /* When this is enabled in the line_table_case, test storing all the data
+     in memory rather than a file.  */
+  bool m_generated_data;
 };
 
 /* Helper function for selftests that need a function decl.  */
@@ -183,7 +194,8 @@ extern tree make_fndecl (tree return_type,
 /* Run TESTCASE multiple times, once for each case in our test matrix.  */
 
 extern void
-for_each_line_table_case (void (*testcase) (const line_table_case &));
+for_each_line_table_case (void (*testcase) (const line_table_case &),
+			  bool test_generated_data = false);
 
 /* Read the contents of PATH into memory, returning a 0-terminated buffer
    that must be freed by the caller.
diff --git a/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.c b/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
index baa6b629b83..29e653625f8 100644
--- a/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
+++ b/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
@@ -430,7 +430,7 @@ test_show_locus (function *fun)
      to upper case.  Give all of the ranges labels (sharing one label).  */
   if (0 == strcmp (fnname, "test_many_nested_locations"))
     {
-      const char *file = LOCATION_FILE (fnstart);
+      const expanded_location xloc = expand_location (fnstart);
       const int start_line = fnstart_line + 2;
       const int finish_line = start_line + 7;
       location_t loc = get_loc (start_line - 1, 2);
@@ -438,7 +438,7 @@ test_show_locus (function *fun)
       rich_location richloc (line_table, loc);
       for (int line = start_line; line <= finish_line; line++)
 	{
-	  char_span content = location_get_source_line (file, line);
+	  char_span content = location_get_source_line (xloc, line);
 	  gcc_assert (content);
 	  /* Split line up into words.  */
 	  for (int idx = 0; idx < content.length (); idx++)
diff --git a/libcpp/directives.cc b/libcpp/directives.cc
index 9dc4363c65a..a29f4abc3cc 100644
--- a/libcpp/directives.cc
+++ b/libcpp/directives.cc
@@ -1162,7 +1162,7 @@ _cpp_do_file_change (cpp_reader *pfile, enum lc_reason reason,
 		     const char *to_file, linenum_type to_line,
 		     unsigned int sysp)
 {
-  linemap_assert (reason != LC_ENTER_MACRO);
+  linemap_assert (reason != LC_ENTER_MACRO && reason != LC_GEN);
 
   const line_map_ordinary *ord_map = NULL;
   if (!to_line && reason == LC_RENAME_VERBATIM)
@@ -1173,6 +1173,7 @@ _cpp_do_file_change (cpp_reader *pfile, enum lc_reason reason,
          preprocessed source.  */
       line_map_ordinary *last = LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table);
       if (!ORDINARY_MAP_STARTING_LINE_NUMBER (last)
+	  && !ORDINARY_MAP_GENERATED_DATA_P (last)
 	  && 0 == filename_cmp (to_file, ORDINARY_MAP_FILE_NAME (last))
 	  && SOURCE_LINE (last, pfile->line_table->highest_line) == 2)
 	{
diff --git a/libcpp/include/line-map.h b/libcpp/include/line-map.h
index 50207cacc12..7bed55548c7 100644
--- a/libcpp/include/line-map.h
+++ b/libcpp/include/line-map.h
@@ -75,6 +75,8 @@ enum lc_reason
   LC_RENAME_VERBATIM,	/* Likewise, but "" != stdin.  */
   LC_ENTER_MACRO,	/* Begin macro expansion.  */
   LC_MODULE,		/* A (C++) Module.  */
+  LC_GEN,		/* Internally generated source.  */
+
   /* FIXME: add support for stringize and paste.  */
   LC_HWM /* High Water Mark.  */
 };
@@ -437,7 +439,13 @@ struct GTY((tag ("1"))) line_map_ordinary : public line_map {
 
   /* Pointer alignment boundary on both 32 and 64-bit systems.  */
 
-  const char *to_file;
+  /* For an LC_GEN map, DATA points to the actual content.  Otherwise it is
+     a file name.  In the former case, the data could contain embedded nulls
+     and it need not be null terminated, so we use the GTY markup appropriate
+     for that case.  */
+  const char * GTY((string_length ("%h.data_len"))) data;
+  unsigned int data_len;
+
   linenum_type to_line;
 
   /* Location from whence this line map was included.  For regular
@@ -662,6 +670,12 @@ ORDINARY_MAP_IN_SYSTEM_HEADER_P (const line_map_ordinary *ord_map)
   return ord_map->sysp;
 }
 
+/* TRUE if this line map contains generated data.  */
+inline bool ORDINARY_MAP_GENERATED_DATA_P (const line_map_ordinary *ord_map)
+{
+  return ord_map->reason == LC_GEN;
+}
+
 /* TRUE if this line map is for a module (not a source file).  */
 
 inline bool
@@ -671,14 +685,42 @@ MAP_MODULE_P (const line_map *map)
 	  && linemap_check_ordinary (map)->reason == LC_MODULE);
 }
 
-/* Get the filename of ordinary map MAP.  */
+/* Get the data contents of ordinary map MAP.  */
 
 inline const char *
 ORDINARY_MAP_FILE_NAME (const line_map_ordinary *ord_map)
 {
-  return ord_map->to_file;
+  linemap_assert (ord_map->reason != LC_GEN);
+  return ord_map->data;
 }
 
+inline const char *
+ORDINARY_MAP_GENERATED_DATA (const line_map_ordinary *ord_map)
+{
+  linemap_assert (ord_map->reason == LC_GEN);
+  return ord_map->data;
+}
+
+inline unsigned int
+ORDINARY_MAP_GENERATED_DATA_LEN (const line_map_ordinary *ord_map)
+{
+  linemap_assert (ord_map->reason == LC_GEN);
+  return ord_map->data_len;
+}
+
+/* Sometimes we don't need to care which kind it is.  */
+inline const char *
+ORDINARY_MAP_FILE_NAME_OR_DATA (const line_map_ordinary *ord_map)
+{
+  return ord_map->data;
+}
+
+/* If we just want to know whether two maps point to the same
+   file/buffer or not.  */
+bool
+ORDINARY_MAPS_SAME_FILE_P (const line_map_ordinary *map1,
+			   const line_map_ordinary *map2);
+
 /* Get the cpp macro whose expansion gave birth to macro map MAP.  */
 
 inline cpp_hashnode *
@@ -1097,17 +1139,19 @@ extern line_map *line_map_new_raw (line_maps *, bool, unsigned);
    map that records locations of tokens that are not part of macro
    replacement-lists present at a macro expansion point.
 
-   The text pointed to by TO_FILE must have a lifetime
-   at least as long as the lifetime of SET.  An empty
-   TO_FILE means standard input.  If reason is LC_LEAVE, and
-   TO_FILE is NULL, then TO_FILE, TO_LINE and SYSP are given their
-   natural values considering the file we are returning to.
+   The text pointed to by DATA must have a lifetime at least as long as the
+   lifetime of SET.  If reason is LC_LEAVE, and DATA is NULL, then DATA, TO_LINE
+   and SYSP are given their natural values considering the file we are returning
+   to.  If reason is LC_GEN, then DATA is the actual content, and DATA_LEN>0 is
+   the length of it.  Otherwise DATA is a file name and DATA_LEN need not be
+   specified.  If DATA_LEN is specified for a file name, it should be the length
+   of the file name, including the terminating null.
 
-   A call to this function can relocate the previous set of
-   maps, so any stored line_map pointers should not be used.  */
+   A call to this function can relocate the previous set of maps, so any stored
+   line_map pointers should not be used.  */
 extern const line_map *linemap_add
   (class line_maps *, enum lc_reason, unsigned int sysp,
-   const char *to_file, linenum_type to_line);
+   const char *data, linenum_type to_line, unsigned int data_len = 0);
 
 /* Create a macro map.  A macro map encodes source locations of tokens
    that are part of a macro replacement-list, at a macro expansion
@@ -1257,7 +1301,7 @@ linemap_position_for_loc_and_offset (class line_maps *set,
 inline const char *
 LINEMAP_FILE (const line_map_ordinary *ord_map)
 {
-  return ord_map->to_file;
+  return ORDINARY_MAP_FILE_NAME (ord_map);
 }
 
 /* Return the line number this map started encoding location from.  */
@@ -1277,6 +1321,13 @@ LINEMAP_SYSP (const line_map_ordinary *ord_map)
   return ord_map->sysp;
 }
 
+/* For a normal ordinary map, this is the same as ORDINARY_MAP_FILE_NAME;
+   but for an LC_GEN map, it returns the file name from which the data
+   originated, instead of asserting.  */
+const char *
+ORDINARY_MAP_CONTAINING_FILE_NAME (line_maps *set,
+				   const line_map_ordinary *ord_map);
+
 const struct line_map *first_map_in_common (line_maps *set,
 					    location_t loc0,
 					    location_t loc1,
@@ -1316,6 +1367,11 @@ typedef struct
 
   /* In a system header?. */
   bool sysp;
+
+  /* If generated data, the data and its length.  The data may contain embedded
+   nulls and need not be null-terminated.  */
+  unsigned int generated_data_len;
+  const char *generated_data;
 } expanded_location;
 
 class range_label;
@@ -2104,12 +2160,14 @@ struct linemap_stats
   long adhoc_table_entries_used;
 };
 
-/* Return the highest location emitted for a given file for which
-   there is a line map in SET.  FILE_NAME is the file name to
-   consider.  If the function returns TRUE, *LOC is set to the highest
-   location emitted for that file.  */
+/* Return the highest location emitted for a given file or generated data buffer
+   for which there is a line map in SET.  If the function returns TRUE, *LOC is
+   set to the highest location emitted for that file.  The const char* arg is
+   either a file name or a generated data buffer, as indicated by
+   IS_DATA.  */
 bool linemap_get_file_highest_location (class line_maps * set,
-					const char *file_name,
+					const char *fname_or_data,
+					bool is_data,
 					location_t *loc);
 
 /* Compute and return statistics about the memory consumption of some
diff --git a/libcpp/line-map.cc b/libcpp/line-map.cc
index 50e8043255e..937b4551122 100644
--- a/libcpp/line-map.cc
+++ b/libcpp/line-map.cc
@@ -48,6 +48,35 @@ static location_t linemap_macro_loc_to_exp_point (line_maps *,
 extern unsigned num_expanded_macros_counter;
 extern unsigned num_macro_tokens_counter;
 
+/* For a normal ordinary map, this is the same as ORDINARY_MAP_FILE_NAME;
+   but for an LC_GEN map, it returns the file name from which the data
+   originated, instead of asserting.  */
+const char *
+ORDINARY_MAP_CONTAINING_FILE_NAME (line_maps *set,
+				   const line_map_ordinary *ord_map)
+{
+  while (ORDINARY_MAP_GENERATED_DATA_P (ord_map))
+    {
+      ord_map = linemap_included_from_linemap (set, ord_map);
+      if (!ord_map)
+	return "-";
+    }
+  return ORDINARY_MAP_FILE_NAME (ord_map);
+}
+
+/* If we just want to know whether two maps point to the same
+   file/buffer or not.  */
+bool
+ORDINARY_MAPS_SAME_FILE_P (const line_map_ordinary *map1,
+			   const line_map_ordinary *map2)
+{
+  const bool is_data = ORDINARY_MAP_GENERATED_DATA_P (map1);
+  return is_data == ORDINARY_MAP_GENERATED_DATA_P (map2)
+    && (is_data
+	? map1->data == map2->data
+	: !filename_cmp (map1->data, map2->data));
+}
+
 /* Destructor for class line_maps.
    Ensure non-GC-managed memory is released.  */
 
@@ -411,8 +440,9 @@ linemap_check_files_exited (line_maps *set)
   for (const line_map_ordinary *map = LINEMAPS_LAST_ORDINARY_MAP (set);
        ! MAIN_FILE_P (map);
        map = linemap_included_from_linemap (set, map))
-    fprintf (stderr, "line-map.cc: file \"%s\" entered but not left\n",
-	     ORDINARY_MAP_FILE_NAME (map));
+    fprintf (stderr, "line-map.cc: file \"%s%s\" entered but not left\n",
+	     ORDINARY_MAP_CONTAINING_FILE_NAME (set, map),
+	     ORDINARY_MAP_GENERATED_DATA_P (map) ? "<generated>" : "");
 }
 
 /* Create NUM zero-initialized maps of type MACRO_P.  */
@@ -504,22 +534,26 @@ LAST_SOURCE_LINE_LOCATION (const line_map_ordinary *map)
 	  + map->start_location);
 }
 
-/* Add a mapping of logical source line to physical source file and
-   line number.
+/* Add a mapping of logical source line to physical source file andg
+   line number.  This function creates an "ordinary map", which is a
+   map that records locations of tokens that are not part of macro
+   replacement-lists present at a macro expansion point.
 
-   The text pointed to by TO_FILE must have a lifetime
-   at least as long as the final call to lookup_line ().  An empty
-   TO_FILE means standard input.  If reason is LC_LEAVE, and
-   TO_FILE is NULL, then TO_FILE, TO_LINE and SYSP are given their
-   natural values considering the file we are returning to.
+   The text pointed to by DATA must have a lifetime at least as long as the
+   lifetime of SET.  If reason is LC_LEAVE, and DATA is NULL, then DATA, TO_LINE
+   and SYSP are given their natural values considering the file we are returning
+   to.  If reason is LC_GEN, then DATA is the actual content, and DATA_LEN>0 is
+   the length of it.  Otherwise DATA is a file name and DATA_LEN need not be
+   specified.  If DATA_LEN is specified for a file name, it should be the length
+   of the file name, including the terminating null.
 
-   FROM_LINE should be monotonic increasing across calls to this
-   function.  A call to this function can relocate the previous set of
-   maps, so any stored line_map pointers should not be used.  */
+   A call to this function can relocate the previous set of maps, so any stored
+   line_map pointers should not be used.  */
 
 const struct line_map *
 linemap_add (line_maps *set, enum lc_reason reason,
-	     unsigned int sysp, const char *to_file, linenum_type to_line)
+	     unsigned int sysp, const char *data, linenum_type to_line,
+	     unsigned int data_len)
 {
   /* Generate a start_location above the current highest_location.
      If possible, make the low range bits be zero.  */
@@ -535,13 +569,25 @@ linemap_add (line_maps *set, enum lc_reason reason,
 		      >= MAP_START_LOCATION (LINEMAPS_LAST_ORDINARY_MAP (set))));
 
   /* When we enter the file for the first time reason cannot be
-     LC_RENAME.  */
-  linemap_assert (!(set->depth == 0 && reason == LC_RENAME));
+     LC_RENAME.  To keep things simple, don't track LC_RENAME for
+     LC_GEN maps, but just keep their reason as always LC_GEN.  */
+  if (reason == LC_RENAME)
+    {
+      linemap_assert (set->depth != 0);
+      const auto prev = LINEMAPS_LAST_ORDINARY_MAP (set);
+      linemap_assert (prev);
+      if (prev->reason == LC_GEN)
+	{
+	  reason = LC_GEN;
+	  data = prev->data;
+	  data_len = prev->data_len;
+	}
+    }
 
   /* If we are leaving the main file, return a NULL map.  */
   if (reason == LC_LEAVE
       && MAIN_FILE_P (LINEMAPS_LAST_ORDINARY_MAP (set))
-      && to_file == NULL)
+      && data == NULL)
     {
       set->depth--;
       return NULL;
@@ -557,8 +603,9 @@ linemap_add (line_maps *set, enum lc_reason reason,
     = linemap_check_ordinary (new_linemap (set, start_location));
   map->reason = reason;
 
-  if (to_file && *to_file == '\0' && reason != LC_RENAME_VERBATIM)
-    to_file = "<stdin>";
+  if (data && *data == '\0' && reason != LC_RENAME_VERBATIM
+      && reason != LC_GEN)
+    data = "<stdin>";
 
   if (reason == LC_RENAME_VERBATIM)
     reason = LC_RENAME;
@@ -577,20 +624,31 @@ linemap_add (line_maps *set, enum lc_reason reason,
 	 that comes right before MAP in the same file.  */
       from = linemap_included_from_linemap (set, map - 1);
 
-      /* A TO_FILE of NULL is special - we use the natural values.  */
-      if (to_file == NULL)
+      /* A DATA of NULL is special - we use the natural values.  */
+      if (data == NULL)
 	{
-	  to_file = ORDINARY_MAP_FILE_NAME (from);
+	  data = ORDINARY_MAP_FILE_NAME_OR_DATA (from);
 	  to_line = SOURCE_LINE (from, from[1].start_location);
 	  sysp = ORDINARY_MAP_IN_SYSTEM_HEADER_P (from);
 	}
       else
-	linemap_assert (filename_cmp (ORDINARY_MAP_FILE_NAME (from),
-				      to_file) == 0);
+	linemap_assert (ORDINARY_MAP_GENERATED_DATA_P (from)
+			? (ORDINARY_MAP_GENERATED_DATA (from) == data)
+			: (filename_cmp (ORDINARY_MAP_FILE_NAME (from), data)
+			   == 0));
     }
 
   map->sysp = sysp;
-  map->to_file = to_file;
+  map->data = data;
+
+  if (reason == LC_GEN)
+    {
+      gcc_assert (data_len);
+      map->data_len = data_len;
+    }
+  else
+    map->data_len = (data_len > 0 ? data_len : strlen (data) + 1);
+
   map->to_line = to_line;
   LINEMAPS_ORDINARY_CACHE (set) = LINEMAPS_ORDINARY_USED (set) - 1;
   /* Do not store range_bits here.  That's readjusted in
@@ -606,7 +664,7 @@ linemap_add (line_maps *set, enum lc_reason reason,
      pure_location_p.  */
   linemap_assert (pure_location_p (set, start_location));
 
-  if (reason == LC_ENTER)
+  if (reason == LC_ENTER || reason == LC_GEN)
     {
       if (set->depth == 0)
 	map->included_from = 0;
@@ -617,7 +675,7 @@ linemap_add (line_maps *set, enum lc_reason reason,
 	      & ~((1 << map[-1].m_column_and_range_bits) - 1))
 	     + map[-1].start_location);
       set->depth++;
-      if (set->trace_includes)
+      if (set->trace_includes && reason == LC_ENTER)
 	trace_include (set, map);
     }
   else if (reason == LC_RENAME)
@@ -863,8 +921,9 @@ linemap_line_start (line_maps *set, linenum_type to_line,
 	        (const_cast <line_map *>
 		  (linemap_add (set, LC_RENAME,
 				ORDINARY_MAP_IN_SYSTEM_HEADER_P (map),
-				ORDINARY_MAP_FILE_NAME (map),
-				to_line)));
+				ORDINARY_MAP_FILE_NAME_OR_DATA (map),
+				to_line,
+				map->data_len)));
       map->m_column_and_range_bits = column_bits;
       map->m_range_bits = range_bits;
       r = (MAP_START_LOCATION (map)
@@ -1025,7 +1084,7 @@ linemap_position_for_loc_and_offset (line_maps *set,
        cannot encode the location there.  */
     if ((map + 1)->reason != LC_RENAME
 	|| line < ORDINARY_MAP_STARTING_LINE_NUMBER (map + 1)
-	|| 0 != strcmp (LINEMAP_FILE (map + 1), LINEMAP_FILE (map)))
+	|| !ORDINARY_MAPS_SAME_FILE_P (map, map + 1))
       return loc;
 
   column += column_offset;
@@ -1283,7 +1342,7 @@ linemap_get_expansion_filename (line_maps *set,
 
   linemap_macro_loc_to_exp_point (set, location, &map);
 
-  return LINEMAP_FILE (map);
+  return ORDINARY_MAP_CONTAINING_FILE_NAME (set, map);
 }
 
 /* Return the name of the macro associated to MACRO_MAP.  */
@@ -1853,8 +1912,12 @@ linemap_expand_location (line_maps *set,
 	abort ();
 
       const line_map_ordinary *ord_map = linemap_check_ordinary (map);
-
-      xloc.file = LINEMAP_FILE (ord_map);
+      xloc.file = ORDINARY_MAP_CONTAINING_FILE_NAME (set, ord_map);
+      if (ORDINARY_MAP_GENERATED_DATA_P (ord_map))
+	{
+	  xloc.generated_data = ORDINARY_MAP_GENERATED_DATA (ord_map);
+	  xloc.generated_data_len = ORDINARY_MAP_GENERATED_DATA_LEN (ord_map);
+	}
       xloc.line = SOURCE_LINE (ord_map, loc);
       xloc.column = SOURCE_COLUMN (ord_map, loc);
       xloc.sysp = LINEMAP_SYSP (ord_map) != 0;
@@ -1873,7 +1936,7 @@ linemap_dump (FILE *stream, class line_maps *set, unsigned ix, bool is_macro)
 {
   const char *const lc_reasons_v[LC_HWM]
       = { "LC_ENTER", "LC_LEAVE", "LC_RENAME", "LC_RENAME_VERBATIM",
-	  "LC_ENTER_MACRO", "LC_MODULE" };
+	  "LC_ENTER_MACRO", "LC_MODULE", "LC_GEN" };
   const line_map *map;
   unsigned reason;
 
@@ -1903,11 +1966,15 @@ linemap_dump (FILE *stream, class line_maps *set, unsigned ix, bool is_macro)
       const line_map_ordinary *includer_map
 	= linemap_included_from_linemap (set, ord_map);
 
-      fprintf (stream, "File: %s:%d\n", ORDINARY_MAP_FILE_NAME (ord_map),
+      fprintf (stream, "File: %s:%d\n",
+	       ORDINARY_MAP_GENERATED_DATA_P (ord_map) ? "<generated>"
+	       : ORDINARY_MAP_FILE_NAME (ord_map),
 	       ORDINARY_MAP_STARTING_LINE_NUMBER (ord_map));
       fprintf (stream, "Included from: [%d] %s\n",
 	       includer_map ? int (includer_map - set->info_ordinary.maps) : -1,
-	       includer_map ? ORDINARY_MAP_FILE_NAME (includer_map) : "None");
+	       includer_map ? ORDINARY_MAP_CONTAINING_FILE_NAME (set,
+								 includer_map)
+	       : "None");
     }
   else
     {
@@ -1931,7 +1998,7 @@ linemap_dump_location (line_maps *set,
 {
   const line_map_ordinary *map;
   location_t location;
-  const char *path = "", *from = "";
+  const char *path = "", *path_suffix = "", *from = "";
   int l = -1, c = -1, s = -1, e = -1;
 
   if (IS_ADHOC_LOC (loc))
@@ -1948,7 +2015,9 @@ linemap_dump_location (line_maps *set,
     linemap_assert (location < RESERVED_LOCATION_COUNT);
   else
     {
-      path = LINEMAP_FILE (map);
+      path = ORDINARY_MAP_CONTAINING_FILE_NAME (set, map);
+      if (ORDINARY_MAP_GENERATED_DATA_P (map))
+	path_suffix = "<generated>";
       l = SOURCE_LINE (map, location);
       c = SOURCE_COLUMN (map, location);
       s = LINEMAP_SYSP (map) != 0;
@@ -1959,24 +2028,27 @@ linemap_dump_location (line_maps *set,
 	{
 	  const line_map_ordinary *from_map
 	    = linemap_included_from_linemap (set, map);
-	  from = from_map ? LINEMAP_FILE (from_map) : "<NULL>";
+	  from = from_map ? ORDINARY_MAP_CONTAINING_FILE_NAME (set, from_map)
+	    : "<NULL>";
 	}
     }
 
   /* P: path, L: line, C: column, S: in-system-header, M: map address,
      E: macro expansion?, LOC: original location, R: resolved location   */
-  fprintf (stream, "{P:%s;F:%s;L:%d;C:%d;S:%d;M:%p;E:%d,LOC:%d,R:%d}",
-	   path, from, l, c, s, (void*)map, e, loc, location);
+  fprintf (stream, "{P:%s%s;F:%s;L:%d;C:%d;S:%d;M:%p;E:%d,LOC:%d,R:%d}",
+	   path, path_suffix, from, l, c, s, (void*)map, e, loc, location);
 }
 
-/* Return the highest location emitted for a given file for which
-   there is a line map in SET.  FILE_NAME is the file name to
-   consider.  If the function returns TRUE, *LOC is set to the highest
-   location emitted for that file.  */
+/* Return the highest location emitted for a given file or generated data buffer
+   for which there is a line map in SET.  If the function returns TRUE, *LOC is
+   set to the highest location emitted for that file.  The const char* arg is
+   either a file name or a generated data buffer, as indicated by
+   IS_DATA.  */
 
 bool
 linemap_get_file_highest_location (line_maps *set,
-				   const char *file_name,
+				   const char *fname_or_data,
+				   bool is_data,
 				   location_t *loc)
 {
   /* If the set is empty or no ordinary map has been created then
@@ -1984,13 +2056,23 @@ linemap_get_file_highest_location (line_maps *set,
   if (set == NULL || set->info_ordinary.used == 0)
     return false;
 
-  /* Now look for the last ordinary map created for FILE_NAME.  */
+  /* Now look for the last ordinary map created for this file.  */
   int i;
   for (i = set->info_ordinary.used - 1; i >= 0; --i)
     {
-      const char *fname = set->info_ordinary.maps[i].to_file;
-      if (fname && !filename_cmp (fname, file_name))
-	break;
+      const auto map = set->info_ordinary.maps + i;
+      if (is_data)
+	{
+	  if (ORDINARY_MAP_GENERATED_DATA_P (map)
+	      && ORDINARY_MAP_GENERATED_DATA (map) == fname_or_data)
+	    break;
+	}
+      else if (!ORDINARY_MAP_GENERATED_DATA_P (map))
+	{
+	  const auto this_fname = ORDINARY_MAP_FILE_NAME (map);
+	  if (this_fname && !filename_cmp (this_fname, fname_or_data))
+	    break;
+	}
     }
 
   if (i < 0)


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