public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc/devel/omp/gcc-10] d: Use read() to load contents of stdin into memory.
@ 2020-09-01 10:01 Tobias Burnus
0 siblings, 0 replies; only message in thread
From: Tobias Burnus @ 2020-09-01 10:01 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:0989a6df97887a448612af2dbad568b8997fb304
commit 0989a6df97887a448612af2dbad568b8997fb304
Author: Iain Buclaw <ibuclaw@gdcproject.org>
Date: Tue Aug 25 11:23:24 2020 +0200
d: Use read() to load contents of stdin into memory.
This would be an improvement over reading one character at a time.
An ICE was discovered when mixing reading from stdin with `-v', this has been
fixed in upstream DMD and backported as well.
Reviewed-on: https://github.com/dlang/dmd/pull/11620
gcc/d/ChangeLog:
* d-lang.cc (d_parse_file): Use read() to load contents from stdin,
allow the front-end to free the memory after parsing.
* dmd/func.c (FuncDeclaration::semantic): Use module filename if
searchPath returns NULL.
(cherry picked from commit 7421802276e737c2da297599121480833db92de9)
Diff:
---
gcc/d/d-lang.cc | 43 +++++++++++++++++++++++++++----------------
gcc/d/dmd/func.c | 5 +++--
2 files changed, 30 insertions(+), 18 deletions(-)
diff --git a/gcc/d/d-lang.cc b/gcc/d/d-lang.cc
index 6848c5e9a1c..4f1bf4a6e6a 100644
--- a/gcc/d/d-lang.cc
+++ b/gcc/d/d-lang.cc
@@ -1026,32 +1026,43 @@ d_parse_file (void)
{
if (strcmp (in_fnames[i], "-") == 0)
{
- /* Handling stdin, generate a unique name for the module. */
- obstack buffer;
- gcc_obstack_init (&buffer);
- int c;
+ /* Load the entire contents of stdin into memory. 8 kilobytes should
+ be a good enough initial size, but double on each iteration.
+ 16 bytes are added for the final '\n' and 15 bytes of padding. */
+ ssize_t size = 8 * 1024;
+ uchar *buffer = XNEWVEC (uchar, size + 16);
+ ssize_t len = 0;
+ ssize_t count;
+
+ while ((count = read (STDIN_FILENO, buffer + len, size - len)) > 0)
+ {
+ len += count;
+ if (len == size)
+ {
+ size *= 2;
+ buffer = XRESIZEVEC (uchar, buffer, size + 16);
+ }
+ }
+
+ if (count < 0)
+ {
+ error (Loc ("stdin", 0, 0), "%s", xstrerror (errno));
+ free (buffer);
+ continue;
+ }
+ /* Handling stdin, generate a unique name for the module. */
Module *m = Module::create (in_fnames[i],
Identifier::generateId ("__stdin"),
global.params.doDocComments,
global.params.doHdrGeneration);
modules.push (m);
- /* Load the entire contents of stdin into memory. */
- while ((c = getc (stdin)) != EOF)
- obstack_1grow (&buffer, c);
-
- if (!obstack_object_size (&buffer))
- obstack_1grow (&buffer, '\0');
-
/* Overwrite the source file for the module, the one created by
Module::create would have a forced a `.d' suffix. */
m->srcfile = File::create ("<stdin>");
- m->srcfile->len = obstack_object_size (&buffer);
- m->srcfile->buffer = (unsigned char *) obstack_finish (&buffer);
-
- /* Tell the front-end not to free the buffer after parsing. */
- m->srcfile->ref = 1;
+ m->srcfile->len = len;
+ m->srcfile->buffer = buffer;
}
else
{
diff --git a/gcc/d/dmd/func.c b/gcc/d/dmd/func.c
index 621405eef3e..8389c00608c 100644
--- a/gcc/d/dmd/func.c
+++ b/gcc/d/dmd/func.c
@@ -1212,8 +1212,9 @@ Ldone:
if (type && mod)
{
printedMain = true;
- const char *name = FileName::searchPath(global.path, mod->srcfile->toChars(), true);
- message("entry %-10s\t%s", type, name);
+ const char *name = mod->srcfile->toChars();
+ const char *path = FileName::searchPath(global.path, name, true);
+ message("entry %-10s\t%s", type, path ? path : name);
}
}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2020-09-01 10:01 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-09-01 10:01 [gcc/devel/omp/gcc-10] d: Use read() to load contents of stdin into memory Tobias Burnus
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).