From 22aede7a1228617661105048a91fddd8797e141b Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Sat, 10 Apr 2021 12:49:01 +0200 Subject: [PATCH] expand: Fix up LTO ICE with COMPOUND_LITERAL_EXPR [PR99849] The gimplifier optimizes away COMPOUND_LITERAL_EXPRs, but they can remain in the form of ADDR_EXPR of COMPOUND_LITERAL_EXPRs in static initializers. By the TREE_STATIC check I meant to check that the underlying decl of the compound literal is a global rather than automatic variable which obviously can't be referenced in static initializers, but unfortunately with LTO it might end up in another partition and thus be DECL_EXTERNAL instead. 2021-04-10 Jakub Jelinek PR lto/99849 * expr.c (expand_expr_addr_expr_1): Test is_global_var rather than just TREE_STATIC on COMPOUND_LITERAL_EXPR_DECLs. * gcc.dg/lto/pr99849_0.c: New test. --- gcc/expr.c | 2 +- gcc/testsuite/gcc.dg/lto/pr99849_0.c | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.dg/lto/pr99849_0.c diff --git a/gcc/expr.c b/gcc/expr.c index 92035c7..a0e1946 100644 --- a/gcc/expr.c +++ b/gcc/expr.c @@ -8204,7 +8204,7 @@ expand_expr_addr_expr_1 (tree exp, rtx target, scalar_int_mode tmode, array with address of COMPOUND_LITERAL_EXPR in DECL_INITIAL; the initializers aren't gimplified. */ if (COMPOUND_LITERAL_EXPR_DECL (exp) - && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp))) + && is_global_var (COMPOUND_LITERAL_EXPR_DECL (exp))) return expand_expr_addr_expr_1 (COMPOUND_LITERAL_EXPR_DECL (exp), target, tmode, modifier, as); /* FALLTHRU */ diff --git a/gcc/testsuite/gcc.dg/lto/pr99849_0.c b/gcc/testsuite/gcc.dg/lto/pr99849_0.c new file mode 100644 index 0000000..d489cee --- /dev/null +++ b/gcc/testsuite/gcc.dg/lto/pr99849_0.c @@ -0,0 +1,23 @@ +/* PR lto/99849 */ +/* { dg-lto-do link } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target shared } */ +/* { dg-extra-ld-options { -shared } } */ +/* { dg-lto-options { { -flto -flto-partition=1to1 -O2 -Wno-incompatible-pointer-types -Wno-discarded-qualifiers -fPIC } } } */ + +struct { struct A *a; } *b; +struct B { int *b; }; +struct C { int *c; }; +const struct D { struct C d; } d; +struct A { struct { struct C e; }; }; +struct E { void *e; } e = { &( &(const struct D) { (void *) &d })->d }; +struct C f = { &( &(const struct D) { (void *) &d })->d }; +struct A g[] = { &e, &f }; +void foo () { b->a = g; } +struct E h = { foo }; +void bar (); +int baz () { bar (h); } +struct B i = { (int *) baz }; +void qux (); +void corge () { qux (i); } +void *j __attribute__((__used__)) = corge; -- 2.7.4