They are needed to hold temporary results when register can not be used.
Signed-off-by: Tomek Grabiec <[email protected]>
---
include/jit/compilation-unit.h | 20 +++++++++++++++++++-
jit/compilation-unit.c | 16 ++++++++++++++++
2 files changed, 35 insertions(+), 1 deletions(-)
diff --git a/include/jit/compilation-unit.h b/include/jit/compilation-unit.h
index 4114bce..be76e5f 100644
--- a/include/jit/compilation-unit.h
+++ b/include/jit/compilation-unit.h
@@ -93,11 +93,18 @@ struct compilation_unit {
struct radix_tree *safepoint_map;
/*
- * Contains native pointers of exception handlers. Indices to
+ * Contains native pointers of exception handlers. Indices to
* this table are the same as for exception table in code
* attribute.
*/
void **exception_handlers;
+
+ /*
+ * These point to stack slots for storing temporary results
+ * within one monoburg rule where we can not use a register.
+ */
+ struct stack_slot *scratch_slot_32;
+ struct stack_slot *scratch_slot_64;
};
struct compilation_unit *compilation_unit_alloc(struct vm_method *);
@@ -109,6 +116,17 @@ struct var_info *get_fixed_var(struct compilation_unit *,
enum machine_reg);
struct basic_block *find_bb(struct compilation_unit *, unsigned long);
unsigned long nr_bblocks(struct compilation_unit *);
void compute_insn_positions(struct compilation_unit *);
+struct stack_slot *get_scratch_slot(struct compilation_unit *, int);
+
+static inline struct stack_slot *get_scratch_slot_32(struct compilation_unit
*cu)
+{
+ return get_scratch_slot(cu, 1);
+}
+
+static inline struct stack_slot *get_scratch_slot_64(struct compilation_unit
*cu)
+{
+ return get_scratch_slot(cu, 2);
+}
#define for_each_variable(var, var_list) for (var = var_list; var != NULL; var
= var->next)
diff --git a/jit/compilation-unit.c b/jit/compilation-unit.c
index 0dd4415..918420c 100644
--- a/jit/compilation-unit.c
+++ b/jit/compilation-unit.c
@@ -267,3 +267,19 @@ void compute_insn_positions(struct compilation_unit *cu)
cu->last_insn = pos;
}
+
+struct stack_slot *get_scratch_slot(struct compilation_unit *cu, int slot_size)
+{
+ switch (slot_size) {
+ case 1:
+ if (!cu->scratch_slot_32)
+ cu->scratch_slot_32 =
get_spill_slot_32(cu->stack_frame);
+ return cu->scratch_slot_32;
+ case 2:
+ if (!cu->scratch_slot_64)
+ cu->scratch_slot_64 =
get_spill_slot_64(cu->stack_frame);
+ return cu->scratch_slot_64;
+ default:
+ error("invalid slot size");
+ }
+}
--
1.6.3.3
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