feat(driver): add #LIB directive hiding library lines in runtime errors

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

4 files changed, 12 insertions, 0 deletions

diff --git a/include/cps/FunctionGen.h b/include/cps/FunctionGen.h
index 5eb0f82..57a27ff 100644
--- a/include/cps/FunctionGen.h
+++ b/include/cps/FunctionGen.h
@@ -79,6 +79,7 @@ private:
     std::map<size_t, std::string> UnitPaths;
     size_t CurrentUnit = 0;
     std::function<bool(size_t)> Visible;
+    std::function<void(const FuncSig &)> BeforeCall;
     ArrayParamBinder BindArrayParam;
     std::function<void(llvm::Value *, const std::string &, int)> RegisterCopy;
 
@@ -103,6 +104,7 @@ public:
     }
 
     void setCurrentUnit(size_t Unit, const std::string &Path) { CurrentUnit = Unit; UnitPaths[Unit] = Path; }
+    void setCallHook(std::function<void(const FuncSig &)> Hook) { BeforeCall = std::move(Hook); }
     void setVisibility(std::function<bool(size_t)> Predicate) { Visible = std::move(Predicate); }
     std::vector<const FuncSig *> getOverloads(const std::string &Name) const;
     bool hasFunction(const std::string &Name) const { return !getOverloads(Name).empty(); }
diff --git a/include/cps/Lexer.h b/include/cps/Lexer.h
index 1c4723e..588a5fa 100644
--- a/include/cps/Lexer.h
+++ b/include/cps/Lexer.h
@@ -120,6 +120,8 @@ class Lexer {
     int CurrentLine = 1;
     int TokenLine = 1;
     bool HadError = false;
+    bool Library = false;
+    bool LineStart = true;
     struct TokenData {
         int Kind, Line;
         std::string Identifier, String;
@@ -145,6 +147,7 @@ public:
     int peekToken(unsigned Offset = 0);
     int peekLine(unsigned Offset = 0);
     int getLine() const { return TokenLine; }
+    bool isLibrary() const { return Library; }
     bool hadError() const { return HadError; }
 };
 
diff --git a/include/cps/RuntimeCheck.h b/include/cps/RuntimeCheck.h
index 30a1910..d2ee1ea 100644
--- a/include/cps/RuntimeCheck.h
+++ b/include/cps/RuntimeCheck.h
@@ -18,6 +18,8 @@ class RuntimeCheck {
     llvm::FunctionCallee StderrFunc;   // Windows: __acrt_iob_func(2)
     llvm::GlobalVariable *StderrVar;   // elsewhere: the C library's stderr
     ExceptionHandler &Exceptions;
+    bool LibraryMode = false;
+    llvm::GlobalVariable *UserLine;
     llvm::Value *DivZeroMsg;
     llvm::Value *OutOfBoundsMsg;
     llvm::Value *EnumRangeMsg;
@@ -31,6 +33,10 @@ public:
     RuntimeCheck(llvm::Module &M, llvm::LLVMContext &C, llvm::IRBuilder<> &B,
                  ExceptionHandler &EH);
 
+    void setLibraryMode(bool Enabled) { LibraryMode = Enabled; }
+    llvm::Value *lineValue(int Line);
+    void setUserLine(int Line);
+
     // Format a runtime diagnostic (printf-style) and write it to stderr.
     void emitStderr(llvm::Value *Msg, llvm::ArrayRef<llvm::Value *> FmtArgs = {});
 
diff --git a/include/cps/SourceUnit.h b/include/cps/SourceUnit.h
index db9ad30..34266ac 100644
--- a/include/cps/SourceUnit.h
+++ b/include/cps/SourceUnit.h
@@ -9,5 +9,6 @@ struct SourceUnit {
     std::string Path;
     const std::vector<std::unique_ptr<StmtAST>> &Statements;
     std::vector<bool> Visible;
+    bool IsLibrary = false;
 };
 }