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authorKyle Gunger <kgunger12@gmail.com>2024-02-04 15:59:54 -0500
committerKyle Gunger <kgunger12@gmail.com>2024-02-04 15:59:54 -0500
commit70265ae25df64e121fc51784b53a46735c4ce829 (patch)
treed1f7823313b79581eb83c99dacaaa2b39af02953
parent6c214178bbdd04a67f045dd8c3e29f3a98502115 (diff)
variable referencing
-rw-r--r--compiler.c56
1 files changed, 50 insertions, 6 deletions
diff --git a/compiler.c b/compiler.c
index 15cb785..a03bd53 100644
--- a/compiler.c
+++ b/compiler.c
@@ -705,16 +705,23 @@ char *_op_get_location(Variable *var) {
return out;
}
+// Can only be used on variables contained in a register.
void var_swap_register(CompData *out, Variable *swap, int new_reg) {
- if(swap->location == new_reg)
+ if(swap->location == new_reg || swap->location < 1)
return;
-
-
-
+ vect_push_string(&out->text, "\tmov ");
+ vect_push_free_string(&out->text, _op_get_register(new_reg, _var_pure_size(swap)));
+ vect_push_string(&out->text, ", ");
+ vect_push_free_string(&out->text, _op_get_register(swap->location, _var_pure_size(swap)));
+ vect_push_string(&out->text, " ; Register swap\n\n");
+ swap->location = new_reg;
}
// Dereference a pointer variable into a new variable "store".
// Store is copied from "from" variable, so it should be empty (will not be freed).
+// In other words, it takes a pointer variable and turns it into a reference,
+// which can be used in other var operations like member variables, struct moving,
+// or value setting.
void var_op_dereference(CompData *out, Variable *store, Variable *from) {
*store = var_copy(from);
if(from->ptr_chain.count < 1 || _var_ptr_type(from) != PTYPE_REF) {
@@ -751,7 +758,11 @@ void var_op_index(CompData *out, Variable *store, Variable *from, Variable *inde
}
-void var_op_set(CompData *out, Variable *store, Variable *from) {
+// Pure set simply copies data from one source to another, disregarding
+// pointer arithmatic. Should not be used to set the value of data reference variables
+// point to, but can be used to directly set the location that reference
+// variables point to for things like function parameter passing.
+void var_op_pure_set(CompData *out, Variable *store, Variable *from) {
if (_var_pure_size(from) != _var_pure_size(store)) {
printf("ERROR: Can't set one variable to the other as their pure sizes are different!\n");
}
@@ -797,10 +808,19 @@ void var_op_set(CompData *out, Variable *store, Variable *from) {
}
}
+// Tries it's best to coerce the data from "from" into a format
+// which will be accepted by "store", following refences in the process.
+// This is similar to a normal move operation.
+void var_op_set(CompData *out, Variable *store, Variable *from) {
+
+}
+
+// Take a variable on the stack or in data section, and load a reference
+// to it's location in memory
void var_op_reference(CompData *out, Variable *store, Variable *from) {
if(from->ptr_chain.count > 0 && _var_ptr_type(from) == PTYPE_REF) {
// The value is a reference to data, so we should just copy it
- var_op_set(out, store, from);
+ var_op_pure_set(out, store, from);
return;
}
@@ -810,7 +830,31 @@ void var_op_reference(CompData *out, Variable *store, Variable *from) {
return;
}
+ vect_push_string(&out->text, "\tlea ");
+ if(store->location < 1) {
+ // Store is on stack or in data sec, so we need to
+ // copy into a tmp register first (we use rsi by convention)
+ vect_push_free_string(&out->text, _op_get_register(5, _var_pure_size(store)));
+ } else {
+ // Since store is in a register we can directly lea
+ vect_push_free_string(&out->text, _op_get_register(store->location, _var_pure_size(store)));
+ }
+
+ vect_push_string(&out->text, ", ");
+ vect_push_free_string(&out->text, _op_get_location(from));
+ vect_push_string(&out->text, " ; Generate reference\n");
+
+ if(store->location < 1) {
+ // If we stored in a tmp register, we need to complete
+ // the move
+ vect_push_string(&out->text, "\tmov ");
+ vect_push_free_string(&out->text, _op_get_location(store));
+ vect_push_string(&out->text, ", ");
+ vect_push_free_string(&out->text, _op_get_register(5, _var_pure_size(store)));
+ vect_push_string(&out->text, " ; Move ref from tmp register to final location\n");
+ }
+ vect_push_string(&out->text, "\n");
}
Variable var_op_member(Variable *from, char *member) {