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author | Jakub Jelinek <jakub@redhat.com> | 2021-06-07 09:25:37 +0200 |
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committer | Jakub Jelinek <jakub@redhat.com> | 2021-06-07 09:25:37 +0200 |
commit | d66a703c8ba86f3ca04cc10c3071696e6d014de6 (patch) | |
tree | b7aa12a7dde48a53c2a6b9dac21df6ca2531cadb /gcc | |
parent | be5efe9c12cb852c788f74f8555e6ab8d755479b (diff) | |
download | gcc-d66a703c8ba86f3ca04cc10c3071696e6d014de6.zip gcc-d66a703c8ba86f3ca04cc10c3071696e6d014de6.tar.gz gcc-d66a703c8ba86f3ca04cc10c3071696e6d014de6.tar.bz2 |
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.
Diffstat (limited to 'gcc')
-rw-r--r-- | gcc/testsuite/g++.dg/ext/va-arg-pack-3.C | 18 | ||||
-rw-r--r-- | 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 0000000..0e8203c --- /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 05d1a25..4250fd8 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); |