add directives and directive based entry points

8 files changed, 19 insertions, 3 deletions

diff --git a/examples/arithmetic.hdass b/examples/arithmetic.hdass
index 359653e..1534146 100644
--- a/examples/arithmetic.hdass
+++ b/examples/arithmetic.hdass
@@ -1,3 +1,5 @@
+[entry: main]
+
 // Computes (5 + 3) * 2 - 1 = 15 and returns it as the exit status.
 const SYS_EXIT = 60
 
diff --git a/examples/branch.hdass b/examples/branch.hdass
index 1218773..15f8d1b 100644
--- a/examples/branch.hdass
+++ b/examples/branch.hdass
@@ -1,3 +1,5 @@
+[entry: main]
+
 // Returns the larger of two values (max(3, 8) = 8) as the exit status.
 const SYS_EXIT = 60
 
diff --git a/examples/call.hdass b/examples/call.hdass
index 239a26b..bf0c515 100644
--- a/examples/call.hdass
+++ b/examples/call.hdass
@@ -1,3 +1,5 @@
+[entry: main]
+
 // Passes an argument through a proc parameter, which exits with that value.
 const SYS_EXIT = 60
 
diff --git a/examples/exit_code.hdass b/examples/exit_code.hdass
index 7c44df9..cabe634 100644
--- a/examples/exit_code.hdass
+++ b/examples/exit_code.hdass
@@ -1,3 +1,5 @@
+[entry: main]
+
 // Exits with status 42 and no output.
 const SYS_EXIT = 60
 
diff --git a/examples/fibonacci.hdasm b/examples/fibonacci.hdasm
index 58f71fe..95a59c8 100644
--- a/examples/fibonacci.hdasm
+++ b/examples/fibonacci.hdasm
@@ -1,3 +1,5 @@
+[entry: main]
+
 const SYS_WRITE = 1
 const SYS_EXIT = 60
 
@@ -41,7 +43,7 @@ proc main
 {
     r12 = 0
     r13 = 1
-    rcx = 10
+    r15 = 10      // syscall clobbers rcx/r11, so keep the counter in r15
 
 loop:
     print_number(r12)
@@ -50,8 +52,8 @@ loop:
     r12 = r13
     r13 += rax
 
-    rcx -= 1
-    if rcx != 0
+    r15 -= 1
+    if r15 != 0
         goto loop
 
     rax = SYS_EXIT
diff --git a/examples/greet.hdass b/examples/greet.hdass
index a253b5e..da9f790 100644
--- a/examples/greet.hdass
+++ b/examples/greet.hdass
@@ -1,3 +1,5 @@
+[entry: main]
+
 // Writes a fixed string to stdout, then exits cleanly.
 const SYS_WRITE = 1
 const SYS_EXIT = 60
diff --git a/examples/hello_world.hdass b/examples/hello_world.hdass
index 59dac80..da6b2b5 100644
--- a/examples/hello_world.hdass
+++ b/examples/hello_world.hdass
@@ -1,3 +1,5 @@
+[entry: main]
+
 const SYS_WRITE = 1
 const SYS_EXIT = 60
 
diff --git a/examples/loop_sum.hdass b/examples/loop_sum.hdass
index bb8d115..5976914 100644
--- a/examples/loop_sum.hdass
+++ b/examples/loop_sum.hdass
@@ -1,3 +1,5 @@
+[entry: main]
+
 // Sums 5 + 4 + 3 + 2 + 1 = 15 with a countdown loop, returns it as the status.
 const SYS_EXIT = 60