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app_vue/node_modules/@webassemblyjs/helper-wasm-section/esm/create.js

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+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+import { encodeNode } from "@webassemblyjs/wasm-gen";
+import { overrideBytesInBuffer } from "@webassemblyjs/helper-buffer";
+import constants from "@webassemblyjs/helper-wasm-bytecode";
+import * as t from "@webassemblyjs/ast";
+
+function findLastSection(ast, forSection) {
+  var targetSectionId = constants.sections[forSection]; // $FlowIgnore: metadata can not be empty
+
+  var moduleSections = ast.body[0].metadata.sections;
+  var lastSection;
+  var lastId = 0;
+
+  for (var i = 0, len = moduleSections.length; i < len; i++) {
+    var section = moduleSections[i]; // Ignore custom section since they can actually occur everywhere
+
+    if (section.section === "custom") {
+      continue;
+    }
+
+    var sectionId = constants.sections[section.section];
+
+    if (targetSectionId > lastId && targetSectionId < sectionId) {
+      return lastSection;
+    }
+
+    lastId = sectionId;
+    lastSection = section;
+  }
+
+  return lastSection;
+}
+
+export function createEmptySection(ast, uint8Buffer, section) {
+  // previous section after which we are going to insert our section
+  var lastSection = findLastSection(ast, section);
+  var start, end;
+  /**
+   * It's the first section
+   */
+
+  if (lastSection == null || lastSection.section === "custom") {
+    start = 8
+    /* wasm header size */
+    ;
+    end = start;
+  } else {
+    start = lastSection.startOffset + lastSection.size.value + 1;
+    end = start;
+  } // section id
+
+
+  start += 1;
+  var sizeStartLoc = {
+    line: -1,
+    column: start
+  };
+  var sizeEndLoc = {
+    line: -1,
+    column: start + 1
+  }; // 1 byte for the empty vector
+
+  var size = t.withLoc(t.numberLiteralFromRaw(1), sizeEndLoc, sizeStartLoc);
+  var vectorOfSizeStartLoc = {
+    line: -1,
+    column: sizeEndLoc.column
+  };
+  var vectorOfSizeEndLoc = {
+    line: -1,
+    column: sizeEndLoc.column + 1
+  };
+  var vectorOfSize = t.withLoc(t.numberLiteralFromRaw(0), vectorOfSizeEndLoc, vectorOfSizeStartLoc);
+  var sectionMetadata = t.sectionMetadata(section, start, size, vectorOfSize);
+  var sectionBytes = encodeNode(sectionMetadata);
+  uint8Buffer = overrideBytesInBuffer(uint8Buffer, start - 1, end, sectionBytes); // Add section into the AST for later lookups
+
+  if (_typeof(ast.body[0].metadata) === "object") {
+    // $FlowIgnore: metadata can not be empty
+    ast.body[0].metadata.sections.push(sectionMetadata);
+    t.sortSectionMetadata(ast.body[0]);
+  }
+  /**
+   * Update AST
+   */
+  // Once we hit our section every that is after needs to be shifted by the delta
+
+
+  var deltaBytes = +sectionBytes.length;
+  var encounteredSection = false;
+  t.traverse(ast, {
+    SectionMetadata: function SectionMetadata(path) {
+      if (path.node.section === section) {
+        encounteredSection = true;
+        return;
+      }
+
+      if (encounteredSection === true) {
+        t.shiftSection(ast, path.node, deltaBytes);
+      }
+    }
+  });
+  return {
+    uint8Buffer: uint8Buffer,
+    sectionMetadata: sectionMetadata
+  };
+}