[scripts] Make j6libc.py into the codegen package

j6libc.py was initially made for libc to generate stdint.h, but it
gained a few things that aren't libc-specific. Move it to a package and
split the int-types-specific code into codegen.int_types.

scripts/codegen/__init__.py

@@ -0,0 +1,16 @@
+import cog
+
+supported_architectures = {
+    "amd64": "__amd64__",
+}
+
+def arch_includes(header, root=""):
+    prefix = "if"
+    for arch, define in supported_architectures.items():
+        cog.outl(f"#{prefix} defined({define})")
+        cog.outl(f"#include <{root}arch/{arch}/{header}>")
+        prefix = "elif"
+    cog.outl("#else")
+    cog.outl('#error "Unsupported platform"')
+    cog.outl("#endif")
+

scripts/codegen/int_types.py

@@ -1,18 +1,5 @@
 import cog
 
-supported_architectures = {
-    "amd64": "__amd64__",
-}
-
-def arch_includes(header):
-    prefix = "if"
-    for arch, define in supported_architectures.items():
-        cog.outl(f"#{prefix} defined({define})")
-        cog.outl(f"#include <__j6libc/arch/{arch}/{header}>")
-        prefix = "elif"
-    cog.outl("#endif")
-
-
 int_widths = (8, 16, 32, 64)
 int_mods = ("fast", "least")
 

src/libraries/libc/include/errno.h.cog

@@ -12,9 +12,9 @@
 
 
 /**[[[cog code generation
-from j6libc import arch_includes
+from codegen import arch_includes
 
-arch_includes("errno.h")
+arch_includes("errno.h", root="__j6libc")
 
 ]]]*/
 /*[[[end]]]*/

src/libraries/libc/include/inttypes.h.cog

@@ -12,7 +12,7 @@
 
 /**[[[cog code generation
 import cog
-from j6libc import definition, int_widths, int_mods
+from codegen.int_types import definition, int_widths, int_mods
 
 for width in int_widths:
     definition("#define", f"PRId{width}", f"__INT{width}_FMTd__")

src/libraries/libc/include/stdatomic.h.cog

@@ -18,7 +18,7 @@ extern "C" {
 #endif
 
 /**[[[cog code generation
-from j6libc import atomic_types
+from codegen.int_types import atomic_types
 
 deftypes = ["BOOL", "CHAR16", "CHAR32", "CHAR", "INT",
             "LLONG", "SHORT", "WCHAR_T", "POINTER"]

src/libraries/libc_free/include/stdint.h.cog

@@ -12,7 +12,7 @@
 
 /**[[[cog code generation
 import cog
-from j6libc import definition, int_widths, int_mods
+from codegen.int_types import definition, int_widths, int_mods
 
 for width in int_widths:
     definition("typedef", f"__INT{width}_TYPE__",  f"int{width}_t;")