https://gcc.gnu.org/g:ec3a01024dd86c51d1e563df9395123765cf548d
commit r12-10202-gec3a01024dd86c51d1e563df9395123765cf548d
Author: Iain Buclaw <ibuc...@gdcproject.org>
Date: Sun Mar 10 17:49:06 2024 +0100
d: Fix -fpreview=in ICEs with forward referenced parameter [PR112285]
The way that the target hook preferPassByRef is implemented, it relied
on the GCC "back-end" tree type to determine whether or not to use `ref'
ABI for D `in' parameters; e.g: prefer by value if it is expected that
the target will pass the type around in registers.
Building the GCC tree type depends on the AST type being complete - all
semantic processing is finished - but as this hook is called from the
front-end, this will not be the case for forward referenced or
self-referencing types.
The consensus in upstream is that `in' parameters should always be
implicitly `ref', but as the front-end does not yet support all types
being rvalue references, limit this just static arrays and structs.
PR d/112285
PR d/112290
gcc/d/ChangeLog:
* d-target.cc (Target::preferPassByRef): Return true for all static
array and struct types.
gcc/testsuite/ChangeLog:
* gdc.dg/pr112285.d: New test.
* gdc.dg/pr112290.d: New test.
* gdc.test/compilable/previewin.d: Adjust testcase.
(cherry picked from commit 025ff57c19efae6c8d76df6b93e7d9827017acc9)
Diff:
---
gcc/d/d-target.cc | 25 +++++--------------------
gcc/testsuite/gdc.dg/pr112285.d | 13 +++++++++++++
gcc/testsuite/gdc.dg/pr112290.d | 15 +++++++++++++++
gcc/testsuite/gdc.test/compilable/previewin.d | 6 ------
4 files changed, 33 insertions(+), 26 deletions(-)
diff --git a/gcc/d/d-target.cc b/gcc/d/d-target.cc
index d4350e593e4..f80ea466e24 100644
--- a/gcc/d/d-target.cc
+++ b/gcc/d/d-target.cc
@@ -586,31 +586,16 @@ Target::supportsLinkerDirective (void) const
}
/* Decides whether an `in' parameter of the specified POD type PARAM_TYPE is to
- be passed by reference or by valie. This is used only when compiling with
+ be passed by reference or by value. This is used only when compiling with
`-fpreview=in' enabled. */
bool
Target::preferPassByRef (Type *param_type)
{
- if (param_type->size () == SIZE_INVALID)
+ /* See note in Target::isReturnOnStack. */
+ Type *tb = param_type->toBasetype ();
+ if (tb->size () == SIZE_INVALID)
return false;
- tree type = build_ctype (param_type);
-
- /* Prefer a `ref' if the type is an aggregate, and its size is greater than
- its alignment. */
- if (AGGREGATE_TYPE_P (type)
- && (!valid_constant_size_p (TYPE_SIZE_UNIT (type))
- || compare_tree_int (TYPE_SIZE_UNIT (type), TYPE_ALIGN (type)) > 0))
- return true;
-
- /* If the back-end is always going to pass this by invisible reference. */
- if (pass_by_reference (NULL, function_arg_info (type, true)))
- return true;
-
- /* If returning the parameter means the caller will do RVO. */
- if (targetm.calls.return_in_memory (type, NULL_TREE))
- return true;
-
- return false;
+ return (tb->ty == TY::Tstruct || tb->ty == TY::Tsarray);
}
diff --git a/gcc/testsuite/gdc.dg/pr112285.d b/gcc/testsuite/gdc.dg/pr112285.d
new file mode 100644
index 00000000000..5ca100a74a9
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/pr112285.d
@@ -0,0 +1,13 @@
+// { dg-do compile }
+// { dg-additional-options "-fpreview=in" }
+struct S112285
+{
+}
+
+class C112285
+{
+ S112285 s;
+ void f112285(in C112285)
+ {
+ }
+}
diff --git a/gcc/testsuite/gdc.dg/pr112290.d b/gcc/testsuite/gdc.dg/pr112290.d
new file mode 100644
index 00000000000..7456fc21be1
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/pr112290.d
@@ -0,0 +1,15 @@
+// { dg-do compile }
+// { dg-additional-options "-fpreview=in" }
+struct S112290a
+{
+ S112290b* p;
+ bool opEquals(in S112290a)
+ {
+ return p == p;
+ }
+}
+
+struct S112290b
+{
+ string s;
+}
diff --git a/gcc/testsuite/gdc.test/compilable/previewin.d
b/gcc/testsuite/gdc.test/compilable/previewin.d
index 8926fbd6aa7..558005c5280 100644
--- a/gcc/testsuite/gdc.test/compilable/previewin.d
+++ b/gcc/testsuite/gdc.test/compilable/previewin.d
@@ -79,14 +79,11 @@ version (Win64)
{
void checkReal(in real p)
{
- // ref for x87 real, value for double-precision real
- static assert(__traits(isRef, p) == (real.sizeof > 8));
}
struct RGB { ubyte r, g, b; }
void checkNonPowerOf2(in RGB p)
{
- static assert(__traits(isRef, p));
}
}
else version (X86_64) // Posix x86_64
@@ -94,7 +91,6 @@ else version (X86_64) // Posix x86_64
struct Empty {} // 1 dummy byte passed on the stack
void checkEmptyStruct(in Empty p)
{
- static assert(!__traits(isRef, p));
}
static if (is(__vector(double[4])))
@@ -102,7 +98,6 @@ else version (X86_64) // Posix x86_64
struct AvxVectorWrapper { __vector(double[4]) a; } // 256 bits
void checkAvxVector(in AvxVectorWrapper p)
{
- static assert(!__traits(isRef, p));
}
}
}
@@ -111,6 +106,5 @@ else version (AArch64)
alias HVA = __vector(float[4])[4]; // can be passed in 4 vector registers
void checkHVA(in HVA p)
{
- static assert(!__traits(isRef, p));
}
}
