source: trip-planner-front/node_modules/@webassemblyjs/helper-wasm-section/lib/resize.js

Last change on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 3.1 KB
Line 
1"use strict";
2
3Object.defineProperty(exports, "__esModule", {
4 value: true
5});
6exports.resizeSectionByteSize = resizeSectionByteSize;
7exports.resizeSectionVecSize = resizeSectionVecSize;
8
9var _wasmGen = require("@webassemblyjs/wasm-gen");
10
11var _ast = require("@webassemblyjs/ast");
12
13var _helperBuffer = require("@webassemblyjs/helper-buffer");
14
15function resizeSectionByteSize(ast, uint8Buffer, section, deltaBytes) {
16 var sectionMetadata = (0, _ast.getSectionMetadata)(ast, section);
17
18 if (typeof sectionMetadata === "undefined") {
19 throw new Error("Section metadata not found");
20 }
21
22 if (typeof sectionMetadata.size.loc === "undefined") {
23 throw new Error("SectionMetadata " + section + " has no loc");
24 } // keep old node location to be overriden
25
26
27 var start = sectionMetadata.size.loc.start.column;
28 var end = sectionMetadata.size.loc.end.column;
29 var newSectionSize = sectionMetadata.size.value + deltaBytes;
30 var newBytes = (0, _wasmGen.encodeU32)(newSectionSize);
31 /**
32 * update AST
33 */
34
35 sectionMetadata.size.value = newSectionSize;
36 var oldu32EncodedLen = end - start;
37 var newu32EncodedLen = newBytes.length; // the new u32 has a different encoded length
38
39 if (newu32EncodedLen !== oldu32EncodedLen) {
40 var deltaInSizeEncoding = newu32EncodedLen - oldu32EncodedLen;
41 sectionMetadata.size.loc.end.column = start + newu32EncodedLen;
42 deltaBytes += deltaInSizeEncoding; // move the vec size pointer size the section size is now smaller
43
44 sectionMetadata.vectorOfSize.loc.start.column += deltaInSizeEncoding;
45 sectionMetadata.vectorOfSize.loc.end.column += deltaInSizeEncoding;
46 } // Once we hit our section every that is after needs to be shifted by the delta
47
48
49 var encounteredSection = false;
50 (0, _ast.traverse)(ast, {
51 SectionMetadata: function SectionMetadata(path) {
52 if (path.node.section === section) {
53 encounteredSection = true;
54 return;
55 }
56
57 if (encounteredSection === true) {
58 (0, _ast.shiftSection)(ast, path.node, deltaBytes);
59 }
60 }
61 });
62 return (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newBytes);
63}
64
65function resizeSectionVecSize(ast, uint8Buffer, section, deltaElements) {
66 var sectionMetadata = (0, _ast.getSectionMetadata)(ast, section);
67
68 if (typeof sectionMetadata === "undefined") {
69 throw new Error("Section metadata not found");
70 }
71
72 if (typeof sectionMetadata.vectorOfSize.loc === "undefined") {
73 throw new Error("SectionMetadata " + section + " has no loc");
74 } // Section has no vector
75
76
77 if (sectionMetadata.vectorOfSize.value === -1) {
78 return uint8Buffer;
79 } // keep old node location to be overriden
80
81
82 var start = sectionMetadata.vectorOfSize.loc.start.column;
83 var end = sectionMetadata.vectorOfSize.loc.end.column;
84 var newValue = sectionMetadata.vectorOfSize.value + deltaElements;
85 var newBytes = (0, _wasmGen.encodeU32)(newValue); // Update AST
86
87 sectionMetadata.vectorOfSize.value = newValue;
88 sectionMetadata.vectorOfSize.loc.end.column = start + newBytes.length;
89 return (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newBytes);
90}
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