Add static and runtime assert

ast.cpp

@@ -20,6 +20,8 @@ enum Ast_Kind: U32{
   AST_CALL_ITEM,
   AST_CALL,
 
+  AST_CONSTANT_ASSERT,
+  AST_RUNTIME_ASSERT,
   AST_SIZE_OF,
   AST_LENGTH_OF,
   AST_ALIGN_OF,
@@ -119,7 +121,8 @@ struct Ast_Binary: Ast_Expr{
 
 struct Ast_Builtin: Ast_Expr{
   Ast_Expr *expr;
-  U64 padding[3]; // For folding constants into atoms
+  Intern_String assert_message;
+  U64 padding[1]; // For folding constants into atoms
 };
 
 // Problem: We are parsing out of order, in the middle of parsing a function
@@ -197,7 +200,6 @@ struct Ast_Scope: Ast{
   Ast_Module *module;
 };
 
-
 struct Ast_Module: Ast_Scope{
   Array<Ast_File *> all_loaded_files;
 };
@@ -507,6 +509,22 @@ ast_module(Intern_String filename){
   return result;
 }
 
+function Ast_Builtin *
+ast_runtime_assert(Token *pos, Ast_Expr *expr, Intern_String message){
+  AST_NEW(Builtin, RUNTIME_ASSERT, pos, AST_EXPR);
+  result->expr = expr;
+  result->assert_message = message;
+  return result;
+}
+
+function Ast_Builtin *
+ast_constant_assert(Token *pos, Ast_Expr *expr, Intern_String message){
+  AST_NEW(Builtin, CONSTANT_ASSERT, pos, AST_EXPR);
+  result->expr = expr;
+  result->assert_message = message;
+  return result;
+}
+
 function Ast_Builtin *
 ast_sizeof(Token *pos, Ast_Expr *expr){
   AST_NEW(Builtin, SIZE_OF, pos, AST_EXPR);