[WebAssembly] Improve libObject support for wasm imports and exports

Previously we had only supported the importing and
exporting of functions and globals.

Also, add usefull overload of getWasmSymbol() and
getNumberOfSymbols() in support of lld port.

Differential Revision: https://reviews.llvm.org/D33011

llvm-svn: 302601

1 files changed, 40 insertions, 23 deletions

diff --git a/llvm/tools/obj2yaml/wasm2yaml.cpp b/llvm/tools/obj2yaml/wasm2yaml.cpp
index cc04b995f66..6efa2ac77b5 100644
--- a/llvm/tools/obj2yaml/wasm2yaml.cpp
+++ b/llvm/tools/obj2yaml/wasm2yaml.cpp
@@ -25,6 +25,23 @@ public:
   ErrorOr<WasmYAML::Object *> dump();
 };
 
+WasmYAML::Table make_table(const wasm::WasmTable &Table) {
+  WasmYAML::Table T;
+  T.ElemType = Table.ElemType;
+  T.TableLimits.Flags = Table.Limits.Flags;
+  T.TableLimits.Initial = Table.Limits.Initial;
+  T.TableLimits.Maximum = Table.Limits.Maximum;
+  return T;
+}
+
+WasmYAML::Limits make_limits(const wasm::WasmLimits &Limits) {
+  WasmYAML::Limits L;
+  L.Flags = Limits.Flags;
+  L.Initial = Limits.Initial;
+  L.Maximum = Limits.Maximum;
+  return L;
+}
+
 ErrorOr<WasmYAML::Object *> WasmDumper::dump() {
   auto Y = make_unique<WasmYAML::Object>();
 
@@ -82,17 +99,26 @@ ErrorOr<WasmYAML::Object *> WasmDumper::dump() {
     case wasm::WASM_SEC_IMPORT: {
       auto ImportSec = make_unique<WasmYAML::ImportSection>();
       for (auto &Import : Obj.imports()) {
-        WasmYAML::Import Ex;
-        Ex.Module = Import.Module;
-        Ex.Field = Import.Field;
-        Ex.Kind = Import.Kind;
-        if (Ex.Kind == wasm::WASM_EXTERNAL_FUNCTION) {
-          Ex.SigIndex = Import.SigIndex;
-        } else if (Ex.Kind == wasm::WASM_EXTERNAL_GLOBAL) {
-          Ex.GlobalType = Import.GlobalType;
-          Ex.GlobalMutable = Import.GlobalMutable;
+        WasmYAML::Import Im;
+        Im.Module = Import.Module;
+        Im.Field = Import.Field;
+        Im.Kind = Import.Kind;
+        switch (Im.Kind) {
+        case wasm::WASM_EXTERNAL_FUNCTION:
+          Im.SigIndex = Import.SigIndex;
+          break;
+        case wasm::WASM_EXTERNAL_GLOBAL:
+          Im.Global.Type = Import.Global.Type;
+          Im.Global.Mutable = Import.Global.Mutable;
+          break;
+        case wasm::WASM_EXTERNAL_TABLE:
+          Im.Table = make_table(Import.Table);
+          break;
+        case wasm::WASM_EXTERNAL_MEMORY:
+          Im.Memory = make_limits(Import.Memory);
+          break;
         }
-        ImportSec->Imports.push_back(Ex);
+        ImportSec->Imports.push_back(Im);
       }
       S = std::move(ImportSec);
       break;
@@ -107,25 +133,16 @@ ErrorOr<WasmYAML::Object *> WasmDumper::dump() {
     }
     case wasm::WASM_SEC_TABLE: {
       auto TableSec = make_unique<WasmYAML::TableSection>();
-      for (auto &Table : Obj.tables()) {
-        WasmYAML::Table T;
-        T.ElemType = Table.ElemType;
-        T.TableLimits.Flags = Table.Limits.Flags;
-        T.TableLimits.Initial = Table.Limits.Initial;
-        T.TableLimits.Maximum = Table.Limits.Maximum;
-        TableSec->Tables.push_back(T);
+      for (const wasm::WasmTable &Table : Obj.tables()) {
+        TableSec->Tables.push_back(make_table(Table));
       }
       S = std::move(TableSec);
       break;
     }
     case wasm::WASM_SEC_MEMORY: {
       auto MemorySec = make_unique<WasmYAML::MemorySection>();
-      for (auto &Memory : Obj.memories()) {
-        WasmYAML::Limits L;
-        L.Flags = Memory.Flags;
-        L.Initial = Memory.Initial;
-        L.Maximum = Memory.Maximum;
-        MemorySec->Memories.push_back(L);
+      for (const wasm::WasmLimits &Memory : Obj.memories()) {
+        MemorySec->Memories.push_back(make_limits(Memory));
       }
       S = std::move(MemorySec);
       break;