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* [gcc r12-1255] tree-inline: Fix up __builtin_va_arg_pack handling [PR100898]
@ 2021-06-07 7:26 Jakub Jelinek
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From: Jakub Jelinek @ 2021-06-07 7:26 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d66a703c8ba86f3ca04cc10c3071696e6d014de6
commit r12-1255-gd66a703c8ba86f3ca04cc10c3071696e6d014de6
Author: Jakub Jelinek <jakub@redhat.com>
Date: Mon Jun 7 09:25:37 2021 +0200
tree-inline: Fix up __builtin_va_arg_pack handling [PR100898]
The following testcase ICEs, because gimple_call_arg_ptr (..., 0)
asserts that there is at least one argument, while we were using
it even if we didn't copy anything just to get a pointer from/to which
the zero arguments should be copied.
Fixed by guarding the memcpy calls. Also, the code was calling
gimple_call_num_args too many times - 5 times instead of 2, so the patch
adds two temporaries for those.
2021-06-07 Jakub Jelinek <jakub@redhat.com>
PR middle-end/100898
* tree-inline.c (copy_bb): Only use gimple_call_arg_ptr if memcpy
should copy any arguments. Don't call gimple_call_num_args
on id->call_stmt or call_stmt more than once.
* g++.dg/ext/va-arg-pack-3.C: New test.
Diff:
---
gcc/testsuite/g++.dg/ext/va-arg-pack-3.C | 18 ++++++++++++++++++
gcc/tree-inline.c | 22 ++++++++++++----------
2 files changed, 30 insertions(+), 10 deletions(-)
diff --git a/gcc/testsuite/g++.dg/ext/va-arg-pack-3.C b/gcc/testsuite/g++.dg/ext/va-arg-pack-3.C
new file mode 100644
index 00000000000..0e8203ca173
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/va-arg-pack-3.C
@@ -0,0 +1,18 @@
+// PR middle-end/100898
+
+int a;
+int bar (int, ...);
+
+static inline __attribute__((always_inline)) int
+foo (...)
+{
+ while (a)
+ return bar (0, __builtin_va_arg_pack ());
+ return 0;
+}
+
+void
+baz (void)
+{
+ foo ();
+}
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index 05d1a253d5b..4250fd86487 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -2090,27 +2090,29 @@ copy_bb (copy_body_data *id, basic_block bb,
tree p;
gcall *new_call;
vec<tree> argarray;
- size_t nargs = gimple_call_num_args (id->call_stmt);
- size_t n;
+ size_t nargs_caller = gimple_call_num_args (id->call_stmt);
+ size_t nargs = nargs_caller;
for (p = DECL_ARGUMENTS (id->src_fn); p; p = DECL_CHAIN (p))
nargs--;
/* Create the new array of arguments. */
- n = nargs + gimple_call_num_args (call_stmt);
+ size_t nargs_callee = gimple_call_num_args (call_stmt);
+ size_t n = nargs + nargs_callee;
argarray.create (n);
argarray.safe_grow_cleared (n, true);
/* Copy all the arguments before '...' */
- memcpy (argarray.address (),
- gimple_call_arg_ptr (call_stmt, 0),
- gimple_call_num_args (call_stmt) * sizeof (tree));
+ if (nargs_callee)
+ memcpy (argarray.address (),
+ gimple_call_arg_ptr (call_stmt, 0),
+ nargs_callee * sizeof (tree));
/* Append the arguments passed in '...' */
- memcpy (argarray.address () + gimple_call_num_args (call_stmt),
- gimple_call_arg_ptr (id->call_stmt, 0)
- + (gimple_call_num_args (id->call_stmt) - nargs),
- nargs * sizeof (tree));
+ if (nargs)
+ memcpy (argarray.address () + nargs_callee,
+ gimple_call_arg_ptr (id->call_stmt, 0)
+ + (nargs_caller - nargs), nargs * sizeof (tree));
new_call = gimple_build_call_vec (gimple_call_fn (call_stmt),
argarray);
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