feat: implement CIE 9.1 text file handling (OPENFILE/READFILE/WRITEFILE/CLOSEFILE/EOF)

Front end: OPENFILE/READFILE/WRITEFILE/CLOSEFILE plus reserved mode
keywords READ/WRITE/APPEND (RANDOM reserved with a dedicated
not-implemented error); statement nodes in new FileAST.h, parsing in new
ParserFile.cc; EOF joins the Builtins table as the 12th builtin and
CallExprAST now carries a line number for its runtime diagnostics.

Runtime: new FileHandler (StringHandler-shaped leaf) lazily synthesizes
internal __cps_file_* helper functions and a 16-slot open-file table
keyed by filename content (strcmp — STRING '=' is pointer identity).
EOF is an fgetc/ungetc peek; READFILE grows a malloc/realloc line buffer
and strips a trailing CR; fopen uses text modes so mingw-w64 line
translation works. File-free programs get byte-identical IR. All misuse
(not open, wrong mode, reopen, fopen failure, read past EOF, table full)
dies with the existing "[Fatal] line N:" pattern via a new
RuntimeCheck::emitErrorAndExit overload taking runtime printf args.

Also fixes a pre-existing ArithmeticHandler hole surfaced by adversarial
review: mixed-width integer operands (i1 BOOLEAN / i8 CHAR vs i64) now
widen via ZExt instead of emitting invalid IR, and remaining type
mismatches get a clean diagnostic; -EOF(f) and -IS_NUM(x) compile.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/cps/FunctionAST.h b/include/cps/FunctionAST.h
index 5b4da6c..613079c 100644
--- a/include/cps/FunctionAST.h
+++ b/include/cps/FunctionAST.h
@@ -42,13 +42,15 @@ public:
 class CallExprAST : public ExprAST {
     std::string Callee;
     std::vector<std::unique_ptr<ExprAST>> Args;
+    int Line;
 
 public:
-    CallExprAST(const std::string &Callee, std::vector<std::unique_ptr<ExprAST>> Args)
-        : Callee(Callee), Args(std::move(Args)) {}
+    CallExprAST(const std::string &Callee, std::vector<std::unique_ptr<ExprAST>> Args, int Line)
+        : Callee(Callee), Args(std::move(Args)), Line(Line) {}
 
     const std::string &getCallee() const { return Callee; }
     const std::vector<std::unique_ptr<ExprAST>> &getArgs() const { return Args; }
+    int getLine() const { return Line; }
 };
 
 class CallStmtAST : public StmtAST {