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authorKyle Gunger <kgunger12@gmail.com>2024-02-05 14:58:12 -0500
committerKyle Gunger <kgunger12@gmail.com>2024-02-05 14:58:12 -0500
commit00cfef2b6688f4fbcea892cd4b6f75d84af1fdcb (patch)
treede71d816fe13588045352494c07008622e390673
parentc6be3482d5a480f2fe52876435ac096518de627c (diff)
Struct move
-rw-r--r--compiler.c68
1 files changed, 61 insertions, 7 deletions
diff --git a/compiler.c b/compiler.c
index 15f60e8..715a4f8 100644
--- a/compiler.c
+++ b/compiler.c
@@ -155,10 +155,11 @@ Vector vect_from_string(char *s) {
}
// Returns the vector data as a null-terminated string
-// do NOT free this pointer. Not safe to use this string
-// at the same time as you are adding or removing from the
-// vector. Instead consider cloning the vector if you must
-// have both, or want an independant copy of the string.
+// do NOT free this pointer unless you discard the vector.
+// Not safe to use this string at the same time as you are
+// adding or removing from the vector. Consider cloning the
+// vector if you must have both, or want an independant copy
+// of the string.
char *vect_as_string(Vector *v) {
((char*)v->data)[v->count * v->_el_sz] = 0;
return v->data;
@@ -770,9 +771,8 @@ void var_op_dereference(CompData *out, Variable *store, Variable *from) {
vect_push_string(&out->text, "\n");
// pointer type -> ref
- int ref = PTYPE_REF;
current = vect_get(&store->ptr_chain, store->ptr_chain.count - 1);
- *current = ref;
+ *current = PTYPE_REF;
// Location -> rsi (5)
store->location = 5;
}
@@ -1002,6 +1002,9 @@ void var_op_set(CompData *out, Variable *store, Variable *from) {
printf("ERROR: Unable to coerce types when one is inbuilt and the other is not.\n\n");
return;
}
+
+ char *mov_from;
+ char *mov_to;
if(is_inbuilt(from->type->name)) {
// Inbuilt types like int, uint, void, etc.
@@ -1010,7 +1013,58 @@ void var_op_set(CompData *out, Variable *store, Variable *from) {
// Two structs, we should only copy as much data as we can from one to another,
// and so will defer to the storage variable for how much to transfer
- //
+ // since we will be using movsb, we first should mov the from struct into
+ // rsi.
+ if (from->location < 1) {
+ vect_push_string(&out->text, "\tlea rsi, ");
+ } else {
+ vect_push_string(&out->text, "\tmov rsi, ");
+ }
+ vect_push_free_string(&out->text, _op_get_location(from));
+ vect_push_string(&out->text, " ; Initial mov to rsi\n");
+
+ // Handle the case where the from struct is a reference
+ size_t i = from->ptr_chain.count;
+ if (from->location > 0)
+ i--;
+
+ for (; i > 0; i--) {
+ int *cur = vect_get(&from->ptr_chain, i - 1);
+ if (*cur == PTYPE_REF)
+ vect_push_string(&out->text, "\tlea rsi, [rsi] ; Deref\n");
+ else
+ break;
+ }
+
+ // load the location of the storeage var into rdi
+ if (store->location < 1) {
+ vect_push_string(&out->text, "\tlea rdi, ");
+ } else {
+ vect_push_string(&out->text, "\tmov rdi, ");
+ }
+ vect_push_free_string(&out->text, _op_get_location(store));
+ vect_push_string(&out->text, " ; Initial mov to rdi\n");
+
+ i = store->ptr_chain.count;
+ if (store->location > 0)
+ i--;
+
+ for (; i > 0; i--) {
+ int *cur = vect_get(&store->ptr_chain, i - 1);
+ if (*cur == PTYPE_REF)
+ vect_push_string(&out->text, "\tlea rsi, [rsi] ; Deref\n");
+ else
+ break;
+ }
+
+ // We can move up to the minimum number of bytes btwn the two structs
+ vect_push_string(&out->text, "\tmov rcx, ");
+ if (_var_size(from) < _var_size(store)) {
+ vect_push_free_string(&out->text, int_to_str(_var_size(from)));
+ } else {
+ vect_push_free_string(&out->text, int_to_str(_var_size(store)));
+ }
+ vect_push_string(&out->text, "\n\tmovsb ; Complete struct move\n\n");
}
}