[PATCH v5 45/62] include: add QEMU_REPEAT helper macro

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

Introduce a macro used in following commit, and convert a few existing
candidates. Inspired by a similar macro in Linux kernel/trace/bpf_trace.c

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 hw/misc/tz-ppc.c               | 19 ++-----------------
 hw/remote/vfio-user-obj.c      | 17 +++--------------
 include/hw/cxl/cxl_component.h |  5 +----
 include/qemu/osdep.h           | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 39 insertions(+), 35 deletions(-)

diff --git a/hw/misc/tz-ppc.c b/hw/misc/tz-ppc.c
index 6f820430eed8..5f09ce164c19 100644
--- a/hw/misc/tz-ppc.c
+++ b/hw/misc/tz-ppc.c
@@ -303,26 +303,11 @@ static const VMStateDescription tz_ppc_vmstate = {
 
 #define DEFINE_PORT(N)                                          \
     DEFINE_PROP_LINK("port[" #N "]", TZPPC, port[N].downstream, \
-                     TYPE_MEMORY_REGION, MemoryRegion *)
+                     TYPE_MEMORY_REGION, MemoryRegion *),
 
 static const Property tz_ppc_properties[] = {
     DEFINE_PROP_UINT32("NONSEC_MASK", TZPPC, nonsec_mask, 0),
-    DEFINE_PORT(0),
-    DEFINE_PORT(1),
-    DEFINE_PORT(2),
-    DEFINE_PORT(3),
-    DEFINE_PORT(4),
-    DEFINE_PORT(5),
-    DEFINE_PORT(6),
-    DEFINE_PORT(7),
-    DEFINE_PORT(8),
-    DEFINE_PORT(9),
-    DEFINE_PORT(10),
-    DEFINE_PORT(11),
-    DEFINE_PORT(12),
-    DEFINE_PORT(13),
-    DEFINE_PORT(14),
-    DEFINE_PORT(15),
+    QEMU_REPEAT(TZ_NUM_PORTS, DEFINE_PORT)
 };
 
 static void tz_ppc_class_init(ObjectClass *klass, const void *data)
diff --git a/hw/remote/vfio-user-obj.c b/hw/remote/vfio-user-obj.c
index 7e6819f670b5..84c3ff05cfb8 100644
--- a/hw/remote/vfio-user-obj.c
+++ b/hw/remote/vfio-user-obj.c
@@ -496,22 +496,11 @@ static size_t vfu_object_bar_rw(PCIDevice *pci_dev, int pci_bar,
                                  buf, count, is_write);                        \
     }                                                                          \
 
-VFU_OBJECT_BAR_HANDLER(0)
-VFU_OBJECT_BAR_HANDLER(1)
-VFU_OBJECT_BAR_HANDLER(2)
-VFU_OBJECT_BAR_HANDLER(3)
-VFU_OBJECT_BAR_HANDLER(4)
-VFU_OBJECT_BAR_HANDLER(5)
-VFU_OBJECT_BAR_HANDLER(6)
+QEMU_REPEAT(PCI_NUM_REGIONS, VFU_OBJECT_BAR_HANDLER)
 
+#define VFU_OBJECT_BAR_HANDLER_PTR(BAR_NO) vfu_object_bar##BAR_NO##_handler,
 static vfu_region_access_cb_t *vfu_object_bar_handlers[PCI_NUM_REGIONS] = {
-    &vfu_object_bar0_handler,
-    &vfu_object_bar1_handler,
-    &vfu_object_bar2_handler,
-    &vfu_object_bar3_handler,
-    &vfu_object_bar4_handler,
-    &vfu_object_bar5_handler,
-    &vfu_object_bar6_handler,
+    QEMU_REPEAT(PCI_NUM_REGIONS, VFU_OBJECT_BAR_HANDLER_PTR)
 };
 
 /**
diff --git a/include/hw/cxl/cxl_component.h b/include/hw/cxl/cxl_component.h
index ffc82202206c..fca8b7055ccd 100644
--- a/include/hw/cxl/cxl_component.h
+++ b/include/hw/cxl/cxl_component.h
@@ -186,10 +186,7 @@ REG32(CXL_HDM_DECODER_GLOBAL_CONTROL, CXL_HDM_REGISTERS_OFFSET + 4)
 /* Support 4 decoders at all levels of topology */
 #define CXL_HDM_DECODER_COUNT 4
 
-HDM_DECODER_INIT(0);
-HDM_DECODER_INIT(1);
-HDM_DECODER_INIT(2);
-HDM_DECODER_INIT(3);
+QEMU_REPEAT(CXL_HDM_DECODER_COUNT, HDM_DECODER_INIT)
 
 /*
  * CXL r3.1 Section 8.2.4.21: CXL Extended Security Capability Structure
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 1ec5b42230be..a5e7ff99cb89 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -191,6 +191,39 @@ extern "C" {
 
 #include "qemu/typedefs.h"
 
+/*
+ * QEMU_REPEAT(n, m) - invoke m(0) m(1) ... m(n-1)
+ *
+ * Expands to n invocations of m, each with a literal integer argument.
+ * n must be a compile-time constant in 0..16.
+ *
+ * Example - generate 4 per-index function definitions:
+ *
+ *   #define DEFINE_GETTER(i) \
+ *   static int get_##i(void) { return values[i]; }
+ *
+ *   QEMU_REPEAT(4, DEFINE_GETTER)
+ */
+#define QEMU_REPEAT_0(m)
+#define QEMU_REPEAT_1(m)   QEMU_REPEAT_0(m)   m(0)
+#define QEMU_REPEAT_2(m)   QEMU_REPEAT_1(m)   m(1)
+#define QEMU_REPEAT_3(m)   QEMU_REPEAT_2(m)   m(2)
+#define QEMU_REPEAT_4(m)   QEMU_REPEAT_3(m)   m(3)
+#define QEMU_REPEAT_5(m)   QEMU_REPEAT_4(m)   m(4)
+#define QEMU_REPEAT_6(m)   QEMU_REPEAT_5(m)   m(5)
+#define QEMU_REPEAT_7(m)   QEMU_REPEAT_6(m)   m(6)
+#define QEMU_REPEAT_8(m)   QEMU_REPEAT_7(m)   m(7)
+#define QEMU_REPEAT_9(m)   QEMU_REPEAT_8(m)   m(8)
+#define QEMU_REPEAT_10(m)  QEMU_REPEAT_9(m)   m(9)
+#define QEMU_REPEAT_11(m)  QEMU_REPEAT_10(m)  m(10)
+#define QEMU_REPEAT_12(m)  QEMU_REPEAT_11(m)  m(11)
+#define QEMU_REPEAT_13(m)  QEMU_REPEAT_12(m)  m(12)
+#define QEMU_REPEAT_14(m)  QEMU_REPEAT_13(m)  m(13)
+#define QEMU_REPEAT_15(m)  QEMU_REPEAT_14(m)  m(14)
+#define QEMU_REPEAT_16(m)  QEMU_REPEAT_15(m)  m(15)
+#define QEMU_REPEAT_(n, m) QEMU_REPEAT_##n(m)
+#define QEMU_REPEAT(n, m)  QEMU_REPEAT_(n, m)
+
 /**
  * Mark a function that executes in coroutine context
  *

-- 
2.55.0.543.g5ebe2ebe4ea8