llvm-readobj: support globals in initializer expressions

[dschuff]

llvm/test/tools/llvm-readobj/wasm/globals.test

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llvm/test/tools/llvm-readobj/wasm/globals.test

+# RUN: yaml2obj %s | llvm-readobj --sections - | FileCheck %s
+
+# Test use of global.get in initializer expressions.
+
+--- !WASM
+FileHeader:
+  Version:         0x00000001
+Sections:
+  - Type:            DATA
+    Segments:
+      - SectionOffset:   6
+        InitFlags:       0
+        Offset:
+          Opcode:          GLOBAL_GET
+          Index:           1
+        Content:         '64'
+...
+
+# CHECK:      Section {
+# CHECK-NEXT:     Type: DATA (0xB)
+# CHECK-NEXT:     Size: 7
+# CHECK-NEXT:     Offset: 8
+# CHECK-NEXT:     Segments [
+# CHECK-NEXT:       Segment {
+# CHECK-NEXT:         Size: 1
+# CHECK-NEXT:         Offset [
+# CHECK-NEXT:           Global: 1
+# CHECK-NEXT:         ]
+# CHECK-NEXT:       }
+# CHECK-NEXT:     ]
+# CHECK-NEXT:   }
+# CHECK-NEXT: ]

llvm/tools/llvm-readobj/WasmDumper.cpp

case wasm::WASM_SEC_DATA: {
         DictScope Group(W, "Segment");
         if (!Seg.Name.empty())
           W.printString("Name", Seg.Name);
         W.printNumber("Size", static_cast<uint64_t>(Seg.Content.size()));
         if (Seg.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST)
           W.printNumber("Offset", Seg.Offset.Value.Int32);
         else if (Seg.Offset.Opcode == wasm::WASM_OPCODE_I64_CONST)
           W.printNumber("Offset", Seg.Offset.Value.Int64);
-        else
+        else if (Seg.Offset.Opcode == wasm::WASM_OPCODE_GLOBAL_GET) {
+          ListScope Group(W, "Offset");
+          W.printNumber("Global", Seg.Offset.Value.Global);
+        } else
           llvm_unreachable("unknown init expr opcode");
       }
       break;
     }
     case wasm::WASM_SEC_MEMORY:
       ListScope Group(W, "Memories");
       for (const wasm::WasmLimits &Memory : Obj->memories()) {
         DictScope Group(W, "Memory");