On 11/3/22 11:06, Torbjorn SVENSSON wrote:
On 2022-11-03 15:17, Nathan Sidwell wrote:
On 10/28/22 05:15, Torbjörn SVENSSON wrote:
On Windows, the ':' character is special and when the module name is
a single character, like 'A', then the flatname would be (for
example) 'A:Foo'. On Windows, 'A:Foo' is treated as an absolute
path by the module loader and is likely not found.
Without this patch, the test case pr98944_c.C fails with:
In module imported at /src/gcc/testsuite/g++.dg/modules/pr98944_b.C:7:1,
of module A:Foo, imported at /src/gcc/testsuite/g++.dg/modules/pr98944_c.C:7:
A:Internals: error: header module expected, module 'A:Internals' found
A:Internals: error: failed to read compiled module: Bad file data
A:Internals: note: compiled module file is 'gcm.cache/A-Internals.gcm'
In module imported at /src/gcc/testsuite/g++.dg/modules/pr98944_c.C:7:8:
A:Foo: error: failed to read compiled module: Bad import dependency
A:Foo: note: compiled module file is 'gcm.cache/A-Foo.gcm'
A:Foo: fatal error: returning to the gate for a mechanical issue
compilation terminated.
include/ChangeLog:
* filenames.h: Added IS_REAL_ABSOLUTE_PATH macro to check if
path is absolute and not semi-absolute on Windows.
Hm, this is unfortunate. The current IS_ABSOLUTE_PATH, is really 'not
relative to cwd', and even then that's untrue if the drive letter there is the
drive letter of cwd, right?
It's awkward to have a new macro for just this purpose and the new name isn't
very indicative of the difference to the current IS_ABSOLUTE_PATH.
Would it be better to not deal with drive letters here? How prevalent are
they these days in windows? Would something like
if (IS_DIR_SEPARATOR (ptr[ptr[0] == '.'])
suffice?
I don't think you can ignore the drive letter part... see below.
#include <stdio.h>
#include "include/filenames.h"
#define TF(x) ((x) ? "true" : "false")
int main(int argc, char *argv[]) {
const char *test[] = {
/* absolute */ "c:\\foo", "c:/foo", "/foo", "\\foo",
/* semi-absolute */ "c:foo",
/* relative */ "foo", "./foo", ".\\foo",
};
for (int i = 0; i < sizeof(test) / sizeof(test[0]); i++) {
const char *ptr = test[i];
printf("\nptr: %s\n", ptr);
printf(" IS_DOS_ABSOLUTE_PATH: %s\n",
TF(IS_DOS_ABSOLUTE_PATH(ptr)));
printf(" IS_DOS_REAL_ABSOLUTE_PATH: %s\n",
TF(IS_DOS_REAL_ABSOLUTE_PATH(ptr)));
printf(" IS_DIR_SEPARATOR: %s\n",
TF(IS_DIR_SEPARATOR(ptr[ptr[0] == '.'])));
}
return 0;
}
The output is:
ptr: c:\foo
IS_DOS_ABSOLUTE_PATH: true
IS_DOS_REAL_ABSOLUTE_PATH: true
IS_DIR_SEPARATOR: false
ptr: c:/foo
IS_DOS_ABSOLUTE_PATH: true
IS_DOS_REAL_ABSOLUTE_PATH: true
IS_DIR_SEPARATOR: false
ptr: /foo
IS_DOS_ABSOLUTE_PATH: true
IS_DOS_REAL_ABSOLUTE_PATH: true
IS_DIR_SEPARATOR: true
ptr: \foo
IS_DOS_ABSOLUTE_PATH: true
IS_DOS_REAL_ABSOLUTE_PATH: true
IS_DIR_SEPARATOR: false
ptr: c:foo
IS_DOS_ABSOLUTE_PATH: true
IS_DOS_REAL_ABSOLUTE_PATH: false
IS_DIR_SEPARATOR: false
ptr: foo
IS_DOS_ABSOLUTE_PATH: false
IS_DOS_REAL_ABSOLUTE_PATH: false
IS_DIR_SEPARATOR: false
ptr: ./foo
IS_DOS_ABSOLUTE_PATH: false
IS_DOS_REAL_ABSOLUTE_PATH: false
IS_DIR_SEPARATOR: true
ptr: .\foo
IS_DOS_ABSOLUTE_PATH: false
IS_DOS_REAL_ABSOLUTE_PATH: false
IS_DIR_SEPARATOR: false
or, failing that perhaps put some explicit WINDOWS-specific #ifdef'd code
there? It's a real corner case.
Would you rather have something like this in module.cc?
if (ptr[0] == '.')
{
if IS_DIR_SEPARATOR (ptr[1]))
return get_module (build_string (strlen (ptr), ptr));
}
else
{
#if HAVE_DOS_BASED_FILE_SYSTEM
if (HAS_DRIVE_SPEC (ptr) && IS_DIR_SEPARATOR (ptr[2]))
#else
if (IS_ABSOLUTE_PATH (ptr))
#endif
return get_module (build_string (strlen (ptr), ptr));
}
Yes, something like the above, but I think you're missing "/bob' in the
DOS_BASED case? shouldn't that also be a pathname?
if (IS_DIR_SEPARATOR (ptr[ptr[0] == '.']) // ./FOO or /FOO
#if HAVE_DOS_BASED_FILE_SYSTEM
// DOS-FS IS_ABSOLUTE_PATH thinks 'A:B' is absolute, but we need to consider
// that as a module:partition.
|| (HAS_DRIVE_SPEC (ptr) && IS_DIR_SEPARATOR (ptr[2])) // A:/FOO
#endif
|| false)
return ....
Does (something like) that work?
nathan
Let me know what you prefer.
Kind regards,
Torbjörn
nathan
gcc/cp/ChangeLog:
* module.cc: Use IS_REAL_ABSOLUTE_PATH macro.
Co-Authored-By: Yvan ROUX <yvan.r...@foss.st.com>
Signed-off-by: Torbjörn SVENSSON <torbjorn.svens...@foss.st.com>
---
gcc/cp/module.cc | 2 +-
include/filenames.h | 4 ++++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 9957df510e6..84680e183b7 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -13958,7 +13958,7 @@ get_module (tree name, module_state *parent, bool
partition)
static module_state *
get_module (const char *ptr)
{
- if (ptr[0] == '.' ? IS_DIR_SEPARATOR (ptr[1]) : IS_ABSOLUTE_PATH (ptr))
+ if (ptr[0] == '.' ? IS_DIR_SEPARATOR (ptr[1]) : IS_REAL_ABSOLUTE_PATH (ptr))
/* A header name. */
return get_module (build_string (strlen (ptr), ptr));
diff --git a/include/filenames.h b/include/filenames.h
index 6c72c422edd..d04fccfed64 100644
--- a/include/filenames.h
+++ b/include/filenames.h
@@ -43,6 +43,7 @@ extern "C" {
# define HAS_DRIVE_SPEC(f) HAS_DOS_DRIVE_SPEC (f)
# define IS_DIR_SEPARATOR(c) IS_DOS_DIR_SEPARATOR (c)
# define IS_ABSOLUTE_PATH(f) IS_DOS_ABSOLUTE_PATH (f)
+# define IS_REAL_ABSOLUTE_PATH(f) IS_DOS_REAL_ABSOLUTE_PATH (f)
#else /* not DOSish */
# if defined(__APPLE__)
# ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
@@ -52,6 +53,7 @@ extern "C" {
# define HAS_DRIVE_SPEC(f) (0)
# define IS_DIR_SEPARATOR(c) IS_UNIX_DIR_SEPARATOR (c)
# define IS_ABSOLUTE_PATH(f) IS_UNIX_ABSOLUTE_PATH (f)
+# define IS_REAL_ABSOLUTE_PATH(f) IS_ABSOLUTE_PATH (f)
#endif
#define IS_DIR_SEPARATOR_1(dos_based, c) \
@@ -67,6 +69,8 @@ extern "C" {
#define IS_DOS_DIR_SEPARATOR(c) IS_DIR_SEPARATOR_1 (1, c)
#define IS_DOS_ABSOLUTE_PATH(f) IS_ABSOLUTE_PATH_1 (1, f)
+#define IS_DOS_REAL_ABSOLUTE_PATH(f) \
+ ((f)[0] && (f)[1] == ':' && ((f)[2] == '/' || (f)[2] == '\\'))
#define HAS_DOS_DRIVE_SPEC(f) HAS_DRIVE_SPEC_1 (1, f)
#define IS_UNIX_DIR_SEPARATOR(c) IS_DIR_SEPARATOR_1 (0, c)
--
Nathan Sidwell
