Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 260 insertions, 0 deletions

diff --git a/devtools/client/shared/source-map-loader/wasm-dwarf/wasmDwarfExpressions.js b/devtools/client/shared/source-map-loader/wasm-dwarf/wasmDwarfExpressions.js
new file mode 100644
index 0000000000..c2f124e99f
--- /dev/null
+++ b/devtools/client/shared/source-map-loader/wasm-dwarf/wasmDwarfExpressions.js
@@ -0,0 +1,260 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+/* eslint camelcase: 0*/
+/* eslint-disable no-inline-comments */
+
+"use strict";
+
+class Value {
+  val;
+
+  constructor(val) {
+    this.val = val;
+  }
+  toString() {
+    return `${this.val}`;
+  }
+}
+
+const Int32Formatter = {
+  fromAddr(addr) {
+    return `(new DataView(memory0.buffer).getInt32(${addr}, true))`;
+  },
+  fromValue(value) {
+    return `${value.val}`;
+  },
+};
+
+const Uint32Formatter = {
+  fromAddr(addr) {
+    return `(new DataView(memory0.buffer).getUint32(${addr}, true))`;
+  },
+  fromValue(value) {
+    return `(${value.val} >>> 0)`;
+  },
+};
+
+function createPieceFormatter(bytes) {
+  let getter;
+  switch (bytes) {
+    case 0:
+    case 1:
+      getter = "getUint8";
+      break;
+    case 2:
+      getter = "getUint16";
+      break;
+    case 3:
+    case 4:
+    default:
+      // FIXME 64-bit
+      getter = "getUint32";
+      break;
+  }
+  const mask = (1 << (8 * bytes)) - 1;
+  return {
+    fromAddr(addr) {
+      return `(new DataView(memory0.buffer).${getter}(${addr}, true))`;
+    },
+    fromValue(value) {
+      return `((${value.val} & ${mask}) >>> 0)`;
+    },
+  };
+}
+
+// eslint-disable-next-line complexity
+function toJS(buf, typeFormatter, frame_base = "fp()") {
+  const readU8 = function () {
+    return buf[i++];
+  };
+  const readS8 = function () {
+    return (readU8() << 24) >> 24;
+  };
+  const readU16 = function () {
+    const w = buf[i] | (buf[i + 1] << 8);
+    i += 2;
+    return w;
+  };
+  const readS16 = function () {
+    return (readU16() << 16) >> 16;
+  };
+  const readS32 = function () {
+    const w =
+      buf[i] | (buf[i + 1] << 8) | (buf[i + 2] << 16) | (buf[i + 3] << 24);
+    i += 4;
+    return w;
+  };
+  const readU32 = function () {
+    return readS32() >>> 0;
+  };
+  const readU = function () {
+    let n = 0,
+      shift = 0,
+      b;
+    while ((b = readU8()) & 0x80) {
+      n |= (b & 0x7f) << shift;
+      shift += 7;
+    }
+    return n | (b << shift);
+  };
+  const readS = function () {
+    let n = 0,
+      shift = 0,
+      b;
+    while ((b = readU8()) & 0x80) {
+      n |= (b & 0x7f) << shift;
+      shift += 7;
+    }
+    n |= b << shift;
+    shift += 7;
+    return shift > 32 ? (n << (32 - shift)) >> (32 - shift) : n;
+  };
+  const popValue = function (formatter) {
+    const loc = stack.pop();
+    if (loc instanceof Value) {
+      return formatter.fromValue(loc);
+    }
+    return formatter.fromAddr(loc);
+  };
+  let i = 0,
+    a,
+    b;
+  const stack = [frame_base];
+  while (i < buf.length) {
+    const code = buf[i++];
+    switch (code) {
+      case 0x03 /* DW_OP_addr */:
+        stack.push(Uint32Formatter.fromAddr(readU32()));
+        break;
+      case 0x08 /* DW_OP_const1u 0x08 1 1-byte constant */:
+        stack.push(readU8());
+        break;
+      case 0x09 /* DW_OP_const1s 0x09 1 1-byte constant */:
+        stack.push(readS8());
+        break;
+      case 0x0a /* DW_OP_const2u 0x0a 1 2-byte constant */:
+        stack.push(readU16());
+        break;
+      case 0x0b /* DW_OP_const2s 0x0b 1 2-byte constant */:
+        stack.push(readS16());
+        break;
+      case 0x0c /* DW_OP_const2u 0x0a 1 2-byte constant */:
+        stack.push(readU32());
+        break;
+      case 0x0d /* DW_OP_const2s 0x0b 1 2-byte constant */:
+        stack.push(readS32());
+        break;
+      case 0x10 /* DW_OP_constu 0x10 1 ULEB128 constant */:
+        stack.push(readU());
+        break;
+      case 0x11 /* DW_OP_const2s 0x0b 1 2-byte constant */:
+        stack.push(readS());
+        break;
+
+      case 0x1c /* DW_OP_minus */:
+        b = stack.pop();
+        a = stack.pop();
+        stack.push(`${a} - ${b}`);
+        break;
+
+      case 0x22 /* DW_OP_plus */:
+        b = stack.pop();
+        a = stack.pop();
+        stack.push(`${a} + ${b}`);
+        break;
+
+      case 0x23 /* DW_OP_plus_uconst */:
+        b = readU();
+        a = stack.pop();
+        stack.push(`${a} + ${b}`);
+        break;
+
+      case 0x30 /* DW_OP_lit0 */:
+      case 0x31:
+      case 0x32:
+      case 0x33:
+      case 0x34:
+      case 0x35:
+      case 0x36:
+      case 0x37:
+      case 0x38:
+      case 0x39:
+      case 0x3a:
+      case 0x3b:
+      case 0x3c:
+      case 0x3d:
+      case 0x3e:
+      case 0x3f:
+      case 0x40:
+      case 0x41:
+      case 0x42:
+      case 0x43:
+      case 0x44:
+      case 0x45:
+      case 0x46:
+      case 0x47:
+      case 0x48:
+      case 0x49:
+      case 0x4a:
+      case 0x4b:
+      case 0x4c:
+      case 0x4d:
+      case 0x4e:
+      case 0x4f:
+        stack.push(`${code - 0x30}`);
+        break;
+
+      case 0x93 /* DW_OP_piece */: {
+        a = readU();
+        const formatter = createPieceFormatter(a);
+        stack.push(popValue(formatter));
+        break;
+      }
+
+      case 0x9f /* DW_OP_stack_value */:
+        stack.push(new Value(stack.pop()));
+        break;
+
+      case 0xf6 /* WASM ext (old, FIXME phase out) */:
+      case 0xed /* WASM ext */:
+        b = readU();
+        a = readS();
+        switch (b) {
+          case 0:
+            stack.push(`var${a}`);
+            break;
+          case 1:
+            stack.push(`global${a}`);
+            break;
+          default:
+            stack.push(`ti${b}(${a})`);
+            break;
+        }
+        break;
+
+      default:
+        // Unknown encoding, baling out
+        return null;
+    }
+  }
+  // FIXME use real DWARF type information
+  return popValue(typeFormatter);
+}
+
+function decodeExpr(expr) {
+  if (expr.includes("//")) {
+    expr = expr.slice(0, expr.indexOf("//")).trim();
+  }
+  const code = new Uint8Array(expr.length >> 1);
+  for (let i = 0; i < code.length; i++) {
+    code[i] = parseInt(expr.substr(i << 1, 2), 16);
+  }
+  const typeFormatter = Int32Formatter;
+  return toJS(code, typeFormatter) || `dwarf("${expr}")`;
+}
+
+module.exports = {
+  decodeExpr,
+};