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node_modules/@webassemblyjs/helper-wasm-section/lib/resize.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.resizeSectionByteSize = resizeSectionByteSize;
+exports.resizeSectionVecSize = resizeSectionVecSize;
+
+var _wasmGen = require("@webassemblyjs/wasm-gen");
+
+var _ast = require("@webassemblyjs/ast");
+
+var _helperBuffer = require("@webassemblyjs/helper-buffer");
+
+function resizeSectionByteSize(ast, uint8Buffer, section, deltaBytes) {
+  var sectionMetadata = (0, _ast.getSectionMetadata)(ast, section);
+
+  if (typeof sectionMetadata === "undefined") {
+    throw new Error("Section metadata not found");
+  }
+
+  if (typeof sectionMetadata.size.loc === "undefined") {
+    throw new Error("SectionMetadata " + section + " has no loc");
+  } // keep old node location to be overriden
+
+
+  var start = sectionMetadata.size.loc.start.column;
+  var end = sectionMetadata.size.loc.end.column;
+  var newSectionSize = sectionMetadata.size.value + deltaBytes;
+  var newBytes = (0, _wasmGen.encodeU32)(newSectionSize);
+  /**
+   * update AST
+   */
+
+  sectionMetadata.size.value = newSectionSize;
+  var oldu32EncodedLen = end - start;
+  var newu32EncodedLen = newBytes.length; // the new u32 has a different encoded length
+
+  if (newu32EncodedLen !== oldu32EncodedLen) {
+    var deltaInSizeEncoding = newu32EncodedLen - oldu32EncodedLen;
+    sectionMetadata.size.loc.end.column = start + newu32EncodedLen;
+    deltaBytes += deltaInSizeEncoding; // move the vec size pointer size the section size is now smaller
+
+    sectionMetadata.vectorOfSize.loc.start.column += deltaInSizeEncoding;
+    sectionMetadata.vectorOfSize.loc.end.column += deltaInSizeEncoding;
+  } // Once we hit our section every that is after needs to be shifted by the delta
+
+
+  var encounteredSection = false;
+  (0, _ast.traverse)(ast, {
+    SectionMetadata: function SectionMetadata(path) {
+      if (path.node.section === section) {
+        encounteredSection = true;
+        return;
+      }
+
+      if (encounteredSection === true) {
+        (0, _ast.shiftSection)(ast, path.node, deltaBytes);
+      }
+    }
+  });
+  return (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newBytes);
+}
+
+function resizeSectionVecSize(ast, uint8Buffer, section, deltaElements) {
+  var sectionMetadata = (0, _ast.getSectionMetadata)(ast, section);
+
+  if (typeof sectionMetadata === "undefined") {
+    throw new Error("Section metadata not found");
+  }
+
+  if (typeof sectionMetadata.vectorOfSize.loc === "undefined") {
+    throw new Error("SectionMetadata " + section + " has no loc");
+  } // Section has no vector
+
+
+  if (sectionMetadata.vectorOfSize.value === -1) {
+    return uint8Buffer;
+  } // keep old node location to be overriden
+
+
+  var start = sectionMetadata.vectorOfSize.loc.start.column;
+  var end = sectionMetadata.vectorOfSize.loc.end.column;
+  var newValue = sectionMetadata.vectorOfSize.value + deltaElements;
+  var newBytes = (0, _wasmGen.encodeU32)(newValue); // Update AST
+
+  sectionMetadata.vectorOfSize.value = newValue;
+  sectionMetadata.vectorOfSize.loc.end.column = start + newBytes.length;
+  return (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newBytes);
+}