better compiler warnings adn errors

internal/engine.cm

@@ -182,9 +182,99 @@ function analyze(src, filename) {
 // Lazy-loaded verify_ir module (loaded on first use)
 var _verify_ir_mod = null
 
+// Module summary extraction for cross-program analysis.
+// Scans mcode IR for use() call patterns and attaches summaries.
+// _summary_resolver is set after shop loads (null during bootstrap).
+var _summary_resolver = null
+
+function extract_module_summaries(compiled) {
+  if (_summary_resolver == null) return null
+  var instrs = null
+  var summaries = []
+  var i = 0
+  var j = 0
+  var n = 0
+  var instr = null
+  var prev = null
+  var op = null
+  var use_slots = {}
+  var frame_map = {}
+  var arg_map = {}
+  var val_slot = 0
+  var f_slot = 0
+  var path = null
+  var result_slot = 0
+  var summary = null
+
+  if (compiled.main == null) return null
+  instrs = compiled.main.instructions
+  if (instrs == null) return null
+  n = length(instrs)
+
+  // Pass 1: find access(slot, {make:"intrinsic", name:"use"})
+  i = 0
+  while (i < n) {
+    instr = instrs[i]
+    if (is_array(instr) && instr[0] == "access") {
+      if (is_object(instr[2]) && instr[2].make == "intrinsic" && instr[2].name == "use") {
+        use_slots[text(instr[1])] = true
+      }
+    }
+    i = i + 1
+  }
+
+  // Pass 2: find frame(frame_slot, use_slot), setarg with string, invoke
+  i = 0
+  while (i < n) {
+    instr = instrs[i]
+    if (is_array(instr)) {
+      op = instr[0]
+      if (op == "frame" || op == "goframe") {
+        if (use_slots[text(instr[2])] == true) {
+          frame_map[text(instr[1])] = true
+        }
+      } else if (op == "setarg") {
+        if (frame_map[text(instr[1])] == true) {
+          val_slot = instr[3]
+          j = i - 1
+          while (j >= 0) {
+            prev = instrs[j]
+            if (is_array(prev) && prev[0] == "access" && prev[1] == val_slot && is_text(prev[2])) {
+              arg_map[text(instr[1])] = prev[2]
+              break
+            }
+            j = j - 1
+          }
+        }
+      } else if (op == "invoke" || op == "tail_invoke") {
+        f_slot = instr[1]
+        path = arg_map[text(f_slot)]
+        if (path != null) {
+          result_slot = instr[2]
+          summary = _summary_resolver(path)
+          if (summary != null) {
+            summaries[] = {slot: result_slot, summary: summary}
+          }
+        }
+      }
+    }
+    i = i + 1
+  }
+
+  if (length(summaries) > 0) return summaries
+  return null
+}
+
 // Run AST through mcode pipeline -> register VM
 function run_ast_fn(name, ast, env) {
   var compiled = mcode_mod(ast)
+  var ms = null
+  var optimized = null
+  var _di = 0
+  var _diag = null
+  var _has_errors = false
+  var mcode_json = null
+  var mach_blob = null
   if (os._verify_ir) {
     if (_verify_ir_mod == null) {
       _verify_ir_mod = load_pipeline_module('verify_ir', pipeline_env)
@@ -192,13 +282,31 @@ function run_ast_fn(name, ast, env) {
     compiled._verify = true
     compiled._verify_mod = _verify_ir_mod
   }
-  var optimized = streamline_mod(compiled)
+  if (!_no_warn) {
+    compiled._warn = true
+    ms = extract_module_summaries(compiled)
+    if (ms != null) {
+      compiled._module_summaries = ms
+    }
+  }
+  optimized = streamline_mod(compiled)
   if (optimized._verify) {
     delete optimized._verify
     delete optimized._verify_mod
   }
-  var mcode_json = json.encode(optimized)
-  var mach_blob = mach_compile_mcode_bin(name, mcode_json)
+  if (optimized._diagnostics != null && length(optimized._diagnostics) > 0) {
+    _di = 0
+    _has_errors = false
+    while (_di < length(optimized._diagnostics)) {
+      _diag = optimized._diagnostics[_di]
+      print(`${_diag.file}:${text(_diag.line)}:${text(_diag.col)}: ${_diag.severity}: ${_diag.message}\n`)
+      if (_diag.severity == "error") _has_errors = true
+      _di = _di + 1
+    }
+    if (_has_errors) disrupt
+  }
+  mcode_json = json.encode(optimized)
+  mach_blob = mach_compile_mcode_bin(name, mcode_json)
   return mach_load(mach_blob, env)
 }
 
@@ -227,6 +335,9 @@ var _init = init
 if (_init != null && _init.native_mode)
   native_mode = true
 
+// Inherit warn mode from init (set by C for --no-warn)
+var _no_warn = (_init != null && _init.no_warn) ? true : false
+
 // CLI path: convert args to init record
 if (args != null && (_init == null || !_init.program)) {
   _program = args[0]
@@ -424,6 +535,19 @@ core_extras.native_mode = native_mode
 // NOW load shop -- it receives all of the above via env
 var shop = use_core('internal/shop')
 use_core('build')
+
+// Wire up module summary resolver now that shop is available
+_summary_resolver = function(path) {
+  var resolved = shop.resolve_use_path(path, null)
+  if (resolved == null) return null
+  var summary_fn = function() {
+    return shop.summary_file(resolved)
+  } disruption {
+    return null
+  }
+  return summary_fn()
+}
+
 var time = use_core('time')
 var toml = use_core('toml')