Support calling functions with arguments

1. The symbol attribute is modified to allow storing a related register
   instead of a memory location.
2. Call check_relop_expr() on all scalar function arguments to make sure
   that type information is available when generating code.
3. calc_array_offset() is modified to accept incomplete arrays, which is
   used when passing parts of arrays as arguments.
4. It is currently possible to crash the code generator by calling a
   function with more than 3 arguments.

1 files changed, 24 insertions, 0 deletions

diff --git a/src/register.c b/src/register.c
index 8ca8b6c..e7759fd 100644
--- a/src/register.c
+++ b/src/register.c
@@ -218,6 +218,30 @@ void ccmmc_register_caller_load(CcmmcRegPool *pool)
             (i + 1) * REG_SIZE);
 }
 
+void ccmmc_register_save_arguments(CcmmcRegPool *pool, int arg_count)
+{
+    if (arg_count <= 0)
+        return;
+    if (arg_count >= 8)
+        arg_count = 8;
+    for (int i = 0; i < arg_count; i++)
+        fprintf(pool->asm_output, "\tstr\tx%d, [sp, #-%d]\n",
+            i, (i + 1) * 8);
+    fprintf(pool->asm_output, "\tsub\tsp, sp, %d\n", arg_count * 8);
+}
+
+void ccmmc_register_load_arguments(CcmmcRegPool *pool, int arg_count)
+{
+    if (arg_count <= 0)
+        return;
+    if (arg_count >= 8)
+        arg_count = 8;
+    fprintf(pool->asm_output, "\tadd\tsp, sp, %d\n", arg_count * 8);
+    for (int i = 0; i < arg_count; i++)
+        fprintf(pool->asm_output, "\tldr\tx%d, [sp, #-%d]\n",
+            i, (i + 1) * 8);
+}
+
 void ccmmc_register_fini(CcmmcRegPool *pool)
 {
     // TODO: free register pool