diff --git a/src/compiler.mjs b/src/compiler.mjs
index 8d2c6e5b6a022..7120a2f3ca665 100755
--- a/src/compiler.mjs
+++ b/src/compiler.mjs
@@ -45,8 +45,8 @@ globalThis.read = (filename) => {
 };
 
 function load(f) {
-  (0, eval)(read(f) + '//# sourceURL=' + find(f));
-};
+  vm.runInThisContext(read(f), { filename: find(f) });
+}
 
 // Basic utilities
 load('utility.js');
diff --git a/src/jsifier.js b/src/jsifier.js
index 2c4cffbc432ae..3ef2f9fedc40a 100644
--- a/src/jsifier.js
+++ b/src/jsifier.js
@@ -106,7 +106,7 @@ function preJS() {
   let result = '';
   for (const fileName of PRE_JS_FILES) {
     if (shouldPreprocess(fileName)) {
-      result += processMacros(preprocess(fileName));
+      result += processMacros(preprocess(fileName), fileName);
     } else {
       result += read(fileName);
     }
@@ -603,7 +603,7 @@ function(${args}) {
   function includeFile(fileName, needsPreprocess = true) {
     print(`// include: ${fileName}`);
     if (needsPreprocess) {
-      print(processMacros(preprocess(fileName)));
+      print(processMacros(preprocess(fileName), fileName));
     } else {
       print(read(fileName));
     }
diff --git a/src/modules.js b/src/modules.js
index 06176d023b488..85d58a992c8e3 100644
--- a/src/modules.js
+++ b/src/modules.js
@@ -233,7 +233,7 @@ globalThis.LibraryManager = {
       }
       currentFile = filename;
       try {
-        processed = processMacros(preprocess(filename));
+        processed = processMacros(preprocess(filename), filename);
         vm.runInThisContext(processed, { filename: filename.replace(/\.\w+$/, '.preprocessed$&') });
       } catch (e) {
         error(`failure to execute js library "${filename}":`);
diff --git a/src/parseTools.js b/src/parseTools.js
index 0831adcb16978..fa89005f0c65b 100644
--- a/src/parseTools.js
+++ b/src/parseTools.js
@@ -9,23 +9,20 @@
  */
 
 globalThis.FOUR_GB = 4 * 1024 * 1024 * 1024;
+globalThis.WASM_PAGE_SIZE = 64 * 1024;
+
 const FLOAT_TYPES = new Set(['float', 'double']);
 
 // Does simple 'macro' substitution, using Django-like syntax,
 // {{{ code }}} will be replaced with |eval(code)|.
 // NOTE: Be careful with that ret check. If ret is |0|, |ret ? ret.toString() : ''| would result in ''!
-function processMacros(text) {
+function processMacros(text, filename) {
   // The `?` here in makes the regex non-greedy so it matches with the closest
   // set of closing braces.
   // `[\s\S]` works like `.` but include newline.
   return text.replace(/{{{([\s\S]+?)}}}/g, (_, str) => {
-    try {
-      const ret = eval(str);
-      return ret !== null ? ret.toString() : '';
-    } catch (ex) {
-      ex.stack = `In the following macro:\n\n${str}\n\n${ex.stack}`;
-      throw ex;
-    }
+    const ret = vm.runInThisContext(str, { filename: filename });
+    return ret !== null ? ret.toString() : '';
   });
 }
 
@@ -180,21 +177,21 @@ function needsQuoting(ident) {
 globalThis.POINTER_SIZE = MEMORY64 ? 8 : 4;
 globalThis.POINTER_MAX = MEMORY64 ? 'Number.MAX_SAFE_INTEGER' : '0xFFFFFFFF';
 globalThis.STACK_ALIGN = 16;
-const POINTER_BITS = POINTER_SIZE * 8;
-const POINTER_TYPE = `u${POINTER_BITS}`;
-const POINTER_JS_TYPE = MEMORY64 ? "'bigint'" : "'number'";
-const POINTER_SHIFT = MEMORY64 ? '3' : '2';
-const POINTER_HEAP = MEMORY64 ? 'HEAP64' : 'HEAP32';
-const LONG_TYPE = `i${POINTER_BITS}`;
+globalThis.POINTER_BITS = POINTER_SIZE * 8;
+globalThis.POINTER_TYPE = `u${POINTER_BITS}`;
+globalThis.POINTER_JS_TYPE = MEMORY64 ? "'bigint'" : "'number'";
+globalThis.POINTER_SHIFT = MEMORY64 ? '3' : '2';
+globalThis.POINTER_HEAP = MEMORY64 ? 'HEAP64' : 'HEAP32';
+globalThis.LONG_TYPE = `i${POINTER_BITS}`;
 
-const SIZE_TYPE = POINTER_TYPE;
+globalThis.SIZE_TYPE = POINTER_TYPE;
 
 
 // Similar to POINTER_TYPE, but this is the actual wasm type that is
 // used in practice, while POINTER_TYPE is the more refined internal
 // type (that is unsigned, where as core wasm does not have unsigned
 // types).
-const POINTER_WASM_TYPE = `i${POINTER_BITS}`;
+globalThis.POINTER_WASM_TYPE = `i${POINTER_BITS}`;
 
 function isPointerType(type) {
   return type[type.length - 1] == '*';
@@ -699,9 +696,6 @@ function makeRetainedCompilerSettings() {
   return ret;
 }
 
-// In wasm, the heap size must be a multiple of 64KiB.
-const WASM_PAGE_SIZE = 65536;
-
 // Receives a function as text, and a function that constructs a modified
 // function, to which we pass the parsed-out arguments, body, and possible
 // "async" prefix of the input function. Returns the output of that function.
diff --git a/tools/preprocessor.mjs b/tools/preprocessor.mjs
index 6f0905c545b20..cce73451177de 100755
--- a/tools/preprocessor.mjs
+++ b/tools/preprocessor.mjs
@@ -52,7 +52,7 @@ global.read = (filename) => {
 };
 
 global.load = (f) => {
-  (0, eval)(read(f) + '//# sourceURL=' + find(f));
+  vm.runInThisContext(read(f), { filename: find(f) });
 };
 
 assert(args.length >= 2);
@@ -65,5 +65,8 @@ load('utility.js');
 load('modules.js');
 load('parseTools.js');
 
-const output = expandMacros ? processMacros(preprocess(inputFile)) : preprocess(inputFile);
+let output = preprocess(inputFile);
+if (expandMacros) {
+  output = processMacros(output, inputFile)
+}
 process.stdout.write(output);