Subzero. WASM. Additional progress.

src/WasmTranslator.cpp

Index: src/WasmTranslator.cpp
diff --git a/src/WasmTranslator.cpp b/src/WasmTranslator.cpp
index b42ad7761442d9adee2475aaa18f9eefa8cb1f0a..6c1ed24659c1307cf613a8fd2233c9da218f6167 100644
--- a/src/WasmTranslator.cpp
+++ b/src/WasmTranslator.cpp
@@ -17,14 +17,33 @@
 
 #if ALLOW_WASM
 
-#include "llvm/Support/StreamingMemoryObject.h"
-
 #include "WasmTranslator.h"
 
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#pragma clang diagnostic ignored "-Wcovered-switch-default"
+#endif // __clang__
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif // defined(__GNUC__) && !defined(__clang__)
+
 #include "src/wasm/module-decoder.h"
 #include "src/wasm/wasm-opcodes.h"
 #include "src/zone.h"
 
+#include "src/bit-vector.h"
+
+#include "src/wasm/ast-decoder-impl.h"
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif // __clang__
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif // defined(__GNUC__) && !defined(__clang__)
+
 #include "IceCfgNode.h"
 #include "IceGlobalInits.h"
 
@@ -35,21 +54,17 @@ using namespace v8::internal;
 using namespace v8::internal::wasm;
 using v8::internal::wasm::DecodeWasmModule;
 
-#include "src/wasm/ast-decoder-impl.h"
-
+#undef LOG
 #define LOG(Expr) log([&](Ostream & out) { Expr; })
 
 namespace {
 
-Ice::Type toIceType(v8::internal::MachineType) {
-  // TODO(eholk): actually convert this.
-  return IceType_i32;
+std::string toStdString(WasmName Name) {
+  return std::string(Name.name, Name.length);
 }
 
 Ice::Type toIceType(wasm::LocalType Type) {
   switch (Type) {
-  default:
-    llvm::report_fatal_error("unexpected enum value");
   case MachineRepresentation::kNone:
     llvm::report_fatal_error("kNone type not supported");
   case MachineRepresentation::kBit:
@@ -71,6 +86,57 @@ Ice::Type toIceType(wasm::LocalType Type) {
   case MachineRepresentation::kTagged:
     llvm::report_fatal_error("kTagged type not supported");
   }
+  llvm::report_fatal_error("unexpected type");
+}
+
+Ice::Type toIceType(v8::internal::MachineType Type) {
+  // TODO (eholk): reorder these based on expected call frequency.
+  if (Type == MachineType::Int32()) {
+    return IceType_i32;
+  }
+  if (Type == MachineType::Uint32()) {
+    return IceType_i32;
+  }
+  if (Type == MachineType::Int8()) {
+    return IceType_i8;
+  }
+  if (Type == MachineType::Uint8()) {
+    return IceType_i8;
+  }
+  if (Type == MachineType::Int16()) {
+    return IceType_i16;
+  }
+  if (Type == MachineType::Uint16()) {
+    return IceType_i16;
+  }
+  if (Type == MachineType::Int64()) {
+    return IceType_i64;
+  }
+  if (Type == MachineType::Uint64()) {
+    return IceType_i64;
+  }
+  if (Type == MachineType::Float32()) {
+    return IceType_f32;
+  }
+  if (Type == MachineType::Float64()) {
+    return IceType_f64;
+  }
+  llvm::report_fatal_error("Unsupported MachineType");
+}
+
+std::string fnNameFromId(uint32_t Id) {
+  return std::string("fn") + to_string(Id);
+}
+
+std::string getFunctionName(const WasmModule *Module, uint32_t func_index) {
+  // Try to find the function name in the export table
+  for (const auto Export : Module->export_table) {
+    if (Export.func_index == func_index) {
+      return "__szwasm_" + toStdString(Module->GetName(Export.name_offset,
+                                                       Export.name_length));
+    }
+  }
+  return fnNameFromId(func_index);
 }
 
 } // end of anonymous namespace
@@ -132,7 +198,11 @@ public:
 
 Ostream &operator<<(Ostream &Out, const OperandNode &Op) {
   if (Op.isOperand()) {
-    Out << "(Operand*)" << Op.toOperand();
+    const auto *Oper = Op.toOperand();
+    Out << "(Operand*)" << Oper;
+    if (Oper) {
+      Out << "::" << Oper->getType();
+    }
   } else if (Op.isCfgNode()) {
     Out << "(CfgNode*)" << Op.toCfgNode();
   } else {
@@ -141,7 +211,7 @@ Ostream &operator<<(Ostream &Out, const OperandNode &Op) {
   return Out;
 }
 
-constexpr bool isComparison(wasm::WasmOpcode Opcode) {
+bool isComparison(wasm::WasmOpcode Opcode) {
   switch (Opcode) {
   case kExprI32Ne:
   case kExprI64Ne:
@@ -157,6 +227,16 @@ constexpr bool isComparison(wasm::WasmOpcode Opcode) {
   case kExprI64GtS:
   case kExprI32GtU:
   case kExprI64GtU:
+  case kExprF32Ne:
+  case kExprF64Ne:
+  case kExprF32Le:
+  case kExprF64Le:
+  case kExprI32LeS:
+  case kExprI64LeS:
+  case kExprI32GeU:
+  case kExprI64GeU:
+  case kExprI32LeU:
+  case kExprI64LeU:
     return true;
   default:
     return false;
@@ -172,7 +252,7 @@ class IceBuilder {
 
 public:
   explicit IceBuilder(class Cfg *Func)
-      : Func(Func), Ctx(Func->getContext()), ControlPtr(nullptr) {}
+      : ControlPtr(nullptr), Func(Func), Ctx(Func->getContext()) {}
 
   /// Allocates a buffer of Nodes for use by V8.
   Node *Buffer(size_t Count) {
@@ -181,14 +261,14 @@ public:
   }
 
   Node Error() { llvm::report_fatal_error("Error"); }
-  Node Start(unsigned Params) {
+  Node Start(uint32_t Params) {
     LOG(out << "Start(" << Params << ") = ");
-    auto *Entry = Func->makeNode();
-    Func->setEntryNode(Entry);
+    auto *Entry = Func->getEntryNode();
+    assert(Entry);
     LOG(out << Node(Entry) << "\n");
     return OperandNode(Entry);
   }
-  Node Param(unsigned Index, wasm::LocalType Type) {
+  Node Param(uint32_t Index, wasm::LocalType Type) {
     LOG(out << "Param(" << Index << ") = ");
     auto *Arg = makeVariable(toIceType(Type));
     assert(Index == NextArg);
@@ -208,25 +288,25 @@ public:
     LOG(out << "Terminate(" << Effect << ", " << Control << ")"
             << "\n");
   }
-  Node Merge(unsigned Count, Node *Controls) {
+  Node Merge(uint32_t Count, Node *Controls) {
     LOG(out << "Merge(" << Count);
-    for (unsigned i = 0; i < Count; ++i) {
+    for (uint32_t i = 0; i < Count; ++i) {
       LOG(out << ", " << Controls[i]);
     }
     LOG(out << ") = ");
 
     auto *MergedNode = Func->makeNode();
 
-    for (unsigned i = 0; i < Count; ++i) {
+    for (uint32_t i = 0; i < Count; ++i) {
       CfgNode *Control = Controls[i];
       Control->appendInst(InstBr::create(Func, MergedNode));
     }
     LOG(out << (OperandNode)MergedNode << "\n");
     return OperandNode(MergedNode);
   }
-  Node Phi(wasm::LocalType Type, unsigned Count, Node *Vals, Node Control) {
+  Node Phi(wasm::LocalType, uint32_t Count, Node *Vals, Node Control) {
     LOG(out << "Phi(" << Count << ", " << Control);
-    for (int i = 0; i < Count; ++i) {
+    for (uint32_t i = 0; i < Count; ++i) {
       LOG(out << ", " << Vals[i]);
     }
     LOG(out << ") = ");
@@ -243,7 +323,7 @@ public:
     // TODO(eholk): find a better way besides multiplying by some arbitrary
     // constant.
     auto *Phi = InstPhi::create(Func, Count * 10, Dest);
-    for (int i = 0; i < Count; ++i) {
+    for (uint32_t i = 0; i < Count; ++i) {
       auto *Op = Vals[i].toOperand();
       assert(Op);
       Phi->addArgument(Op, InEdges[i]);
@@ -253,10 +333,10 @@ public:
     LOG(out << Node(Dest) << "\n");
     return OperandNode(Dest);
   }
-  Node EffectPhi(unsigned Count, Node *Effects, Node Control) {
+  Node EffectPhi(uint32_t Count, Node *Effects, Node Control) {
     // TODO(eholk): this function is almost certainly wrong.
     LOG(out << "EffectPhi(" << Count << ", " << Control << "):\n");
-    for (unsigned i = 0; i < Count; ++i) {
+    for (uint32_t i = 0; i < Count; ++i) {
       LOG(out << "  " << Effects[i] << "\n");
     }
     return OperandNode(nullptr);
@@ -294,13 +374,18 @@ public:
     LOG(out << "Binop(" << WasmOpcodes::OpcodeName(Opcode) << ", " << Left
             << ", " << Right << ") = ");
     auto *Dest = makeVariable(
-        isComparison(Opcode) ? IceType_i1 : Left.toOperand()->getType());
+        isComparison(Opcode) ? IceType_i32 : Left.toOperand()->getType());
     switch (Opcode) {
     case kExprI32Add:
     case kExprI64Add:
       Control()->appendInst(
           InstArithmetic::create(Func, InstArithmetic::Add, Dest, Left, Right));
       break;
+    case kExprF32Add:
+    case kExprF64Add:
+      Control()->appendInst(InstArithmetic::create(Func, InstArithmetic::Fadd,
+                                                   Dest, Left, Right));
+      break;
     case kExprI32Sub:
     case kExprI64Sub:
       Control()->appendInst(
@@ -321,6 +406,11 @@ public:
       Control()->appendInst(InstArithmetic::create(Func, InstArithmetic::Urem,
                                                    Dest, Left, Right));
       break;
+    case kExprI32RemS:
+    case kExprI64RemS:
+      Control()->appendInst(InstArithmetic::create(Func, InstArithmetic::Srem,
+                                                   Dest, Left, Right));
+      break;
     case kExprI32Ior:
     case kExprI64Ior:
       Control()->appendInst(
@@ -336,6 +426,28 @@ public:
       Control()->appendInst(
           InstArithmetic::create(Func, InstArithmetic::Shl, Dest, Left, Right));
       break;
+    case kExprI32Rol: {
+      // TODO(eholk): add rotate as an ICE instruction to make it easier to take
+      // advantage of hardware support.
+
+      // TODO(eholk): don't hardcode so many numbers.
+      auto *Masked = makeVariable(IceType_i32);
+      auto *Bottom = makeVariable(IceType_i32);
+      auto *Top = makeVariable(IceType_i32);
+      Control()->appendInst(InstArithmetic::create(
+          Func, InstArithmetic::And, Masked, Right, Ctx->getConstantInt32(31)));
+      Control()->appendInst(
+          InstArithmetic::create(Func, InstArithmetic::Shl, Top, Left, Masked));
+      auto *RotShift = makeVariable(IceType_i32);
+      Control()->appendInst(
+          InstArithmetic::create(Func, InstArithmetic::Sub, RotShift,
+                                 Ctx->getConstantInt32(32), Masked));
+      Control()->appendInst(InstArithmetic::create(Func, InstArithmetic::Lshr,
+                                                   Bottom, Left, Masked));
+      Control()->appendInst(
+          InstArithmetic::create(Func, InstArithmetic::Or, Dest, Top, Bottom));
+      break;
+    }
     case kExprI32ShrU:
     case kExprI64ShrU:
     case kExprI32ShrS:
@@ -349,39 +461,112 @@ public:
           InstArithmetic::create(Func, InstArithmetic::And, Dest, Left, Right));
       break;
     case kExprI32Ne:
-    case kExprI64Ne:
+    case kExprI64Ne: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Ne, TmpDest, Left, Right));
       Control()->appendInst(
-          InstIcmp::create(Func, InstIcmp::Ne, Dest, Left, Right));
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
       break;
+    }
     case kExprI32Eq:
-    case kExprI64Eq:
+    case kExprI64Eq: {
+      auto *TmpDest = makeVariable(IceType_i1);
       Control()->appendInst(
-          InstIcmp::create(Func, InstIcmp::Eq, Dest, Left, Right));
+          InstIcmp::create(Func, InstIcmp::Eq, TmpDest, Left, Right));
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
       break;
+    }
     case kExprI32LtS:
-    case kExprI64LtS:
+    case kExprI64LtS: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Slt, TmpDest, Left, Right));
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
+      break;
+    }
+    case kExprI32LeS:
+    case kExprI64LeS: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Sle, TmpDest, Left, Right));
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
+      break;
+    }
+    case kExprI32GeU:
+    case kExprI64GeU: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Uge, TmpDest, Left, Right));
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
+      break;
+    }
+    case kExprI32LeU:
+    case kExprI64LeU: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Ule, TmpDest, Left, Right));
       Control()->appendInst(
-          InstIcmp::create(Func, InstIcmp::Slt, Dest, Left, Right));
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
       break;
+    }
     case kExprI32LtU:
-    case kExprI64LtU:
+    case kExprI64LtU: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Ult, TmpDest, Left, Right));
       Control()->appendInst(
-          InstIcmp::create(Func, InstIcmp::Ult, Dest, Left, Right));
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
       break;
+    }
     case kExprI32GeS:
-    case kExprI64GeS:
+    case kExprI64GeS: {
+      auto *TmpDest = makeVariable(IceType_i1);
       Control()->appendInst(
-          InstIcmp::create(Func, InstIcmp::Sge, Dest, Left, Right));
+          InstIcmp::create(Func, InstIcmp::Sge, TmpDest, Left, Right));
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
+    }
     case kExprI32GtS:
-    case kExprI64GtS:
+    case kExprI64GtS: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Sgt, TmpDest, Left, Right));
       Control()->appendInst(
-          InstIcmp::create(Func, InstIcmp::Sgt, Dest, Left, Right));
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
       break;
+    }
     case kExprI32GtU:
-    case kExprI64GtU:
+    case kExprI64GtU: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstIcmp::create(Func, InstIcmp::Ugt, TmpDest, Left, Right));
       Control()->appendInst(
-          InstIcmp::create(Func, InstIcmp::Ugt, Dest, Left, Right));
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
       break;
+    }
+    case kExprF32Ne:
+    case kExprF64Ne: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstFcmp::create(Func, InstFcmp::Une, TmpDest, Left, Right));
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
+      break;
+    }
+    case kExprF32Le:
+    case kExprF64Le: {
+      auto *TmpDest = makeVariable(IceType_i1);
+      Control()->appendInst(
+          InstFcmp::create(Func, InstFcmp::Ule, TmpDest, Left, Right));
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, TmpDest));
+      break;
+    }
     default:
       LOG(out << "Unknown binop: " << WasmOpcodes::OpcodeName(Opcode) << "\n");
       llvm::report_fatal_error("Uncovered or invalid binop.");
@@ -395,6 +580,14 @@ public:
             << ") = ");
     Ice::Variable *Dest = nullptr;
     switch (Opcode) {
+    case kExprI32Eqz: {
+      Dest = makeVariable(IceType_i32);
+      auto *Tmp = makeVariable(IceType_i1);
+      Control()->appendInst(InstIcmp::create(Func, InstIcmp::Eq, Tmp, Input,
+                                             Ctx->getConstantInt32(0)));
+      Control()->appendInst(InstCast::create(Func, InstCast::Sext, Dest, Tmp));
+      break;
+    }
     case kExprF32Neg: {
       Dest = makeVariable(IceType_f32);
       Control()->appendInst(InstArithmetic::create(
@@ -412,6 +605,21 @@ public:
       Control()->appendInst(
           InstCast::create(Func, InstCast::Zext, Dest, Input));
       break;
+    case kExprI64SConvertI32:
+      Dest = makeVariable(IceType_i64);
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sext, Dest, Input));
+      break;
+    case kExprI32ConvertI64:
+      Dest = makeVariable(IceType_i32);
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Trunc, Dest, Input));
+      break;
+    case kExprF64SConvertI32:
+      Dest = makeVariable(IceType_f64);
+      Control()->appendInst(
+          InstCast::create(Func, InstCast::Sitofp, Dest, Input));
+      break;
     default:
       LOG(out << "Unknown unop: " << WasmOpcodes::OpcodeName(Opcode) << "\n");
       llvm::report_fatal_error("Uncovered or invalid unop.");
@@ -420,14 +628,14 @@ public:
     LOG(out << Dest << "\n");
     return OperandNode(Dest);
   }
-  unsigned InputCount(CfgNode *Node) const { return Node->getInEdges().size(); }
+  uint32_t InputCount(CfgNode *Node) const { return Node->getInEdges().size(); }
   bool IsPhiWithMerge(Node Phi, Node Merge) const {
     LOG(out << "IsPhiWithMerge(" << Phi << ", " << Merge << ")"
             << "\n");
     if (Phi && Phi.isOperand()) {
       LOG(out << "  ...is operand"
               << "\n");
-      if (auto *Inst = getDefiningInst(Phi)) {
+      if (getDefiningInst(Phi)) {
         LOG(out << "  ...has defining instruction"
                 << "\n");
         LOG(out << getDefNode(Phi) << "\n");
@@ -444,6 +652,7 @@ public:
     LOG(out << "AppendToPhi(" << Merge << ", " << Phi << ", " << From << ")"
             << "\n");
     auto *Inst = getDefiningInst(Phi);
+    assert(Inst->getDest()->getType() == From.toOperand()->getType());
     Inst->addArgument(From, getDefNode(From));
   }
 
@@ -463,13 +672,50 @@ public:
     LOG(out << *TrueNode << ", " << *FalseNode << ")"
             << "\n");
 
-    Ctrl->appendInst(InstBr::create(Func, Cond, *TrueNode, *FalseNode));
+    auto *CondBool = makeVariable(IceType_i1);
+    Ctrl->appendInst(InstCast::create(Func, InstCast::Trunc, CondBool, Cond));
+
+    Ctrl->appendInst(InstBr::create(Func, CondBool, *TrueNode, *FalseNode));
     return OperandNode(nullptr);
   }
-  Node Switch(unsigned Count, Node Key) { llvm::report_fatal_error("Switch"); }
-  Node IfValue(int32_t Value, Node Sw) { llvm::report_fatal_error("IfValue"); }
-  Node IfDefault(Node Sw) { llvm::report_fatal_error("IfDefault"); }
-  Node Return(unsigned Count, Node *Vals) {
+  InstSwitch *CurrentSwitch = nullptr;
+  CfgNode *SwitchNode = nullptr;
+  SizeT SwitchIndex = 0;
+  Node Switch(uint32_t Count, Node Key) {
+    LOG(out << "Switch(" << Count << ", " << Key << ")\n");
+
+    assert(!CurrentSwitch);
+
+    auto *Default = Func->makeNode();
+    // Count - 1 because the decoder counts the default label but Subzero does
+    // not.
+    CurrentSwitch = InstSwitch::create(Func, Count - 1, Key, Default);
+    SwitchIndex = 0;
+    SwitchNode = Control();
+    // We don't actually append the switch to the CfgNode here because not all
+    // the branches are ready.
+    return Node(nullptr);
+  }
+  Node IfValue(int32_t Value, Node) {
+    LOG(out << "IfValue(" << Value << ") [Index = " << SwitchIndex << "]\n");
+    assert(CurrentSwitch);
+    auto *Target = Func->makeNode();
+    CurrentSwitch->addBranch(SwitchIndex++, Value, Target);
+    return Node(Target);
+  }
+  Node IfDefault(Node) {
+    LOG(out << "IfDefault(...) [Index = " << SwitchIndex << "]\n");
+    assert(CurrentSwitch);
+    assert(CurrentSwitch->getLabelDefault());
+    // Now we append the switch, since this should be the last edge.
+    assert(SwitchIndex == CurrentSwitch->getNumCases());
+    SwitchNode->appendInst(CurrentSwitch);
+    SwitchNode = nullptr;
+    auto Default = Node(CurrentSwitch->getLabelDefault());
+    CurrentSwitch = nullptr;
+    return Default;
+  }
+  Node Return(uint32_t Count, Node *Vals) {
     assert(1 >= Count);
     LOG(out << "Return(");
     if (Count > 0)
@@ -511,20 +757,20 @@ public:
     const auto NumArgs = Sig->parameter_count();
     LOG(out << "  number of args: " << NumArgs << "\n");
 
-    const auto TargetName =
-        Ctx->getGlobalString(Module->GetName(Target.name_offset));
+    const auto TargetName = getFunctionName(Module, Index);
     LOG(out << "  target name: " << TargetName << "\n");
 
     assert(Sig->return_count() <= 1);
 
-    auto *TargetOperand = Ctx->getConstantSym(0, TargetName);
+    auto TargetOperand =
+        Ctx->getConstantSym(0, Ctx->getGlobalString(TargetName));
 
     auto *Dest = Sig->return_count() > 0
                      ? makeVariable(toIceType(Sig->GetReturn()))
                      : nullptr;
     auto *Call = InstCall::create(Func, NumArgs, Dest, TargetOperand,
                                   false /* HasTailCall */);
-    for (int i = 0; i < NumArgs; ++i) {
+    for (uint32_t i = 0; i < NumArgs; ++i) {
       // The builder reserves the first argument for the code object.
       LOG(out << "  args[" << i << "] = " << Args[i + 1] << "\n");
       Call->addArg(Args[i + 1]);
@@ -545,13 +791,17 @@ public:
     LOG(out << "  number of args: " << NumArgs << "\n");
 
     const auto &Target = Module->import_table[Index];
-    const auto TargetName =
-        Ctx->getGlobalString(Module->GetName(Target.function_name_offset));
+    const auto ModuleName = toStdString(
+        Module->GetName(Target.module_name_offset, Target.module_name_length));
+    const auto FnName = toStdString(Module->GetName(
+        Target.function_name_offset, Target.function_name_length));
+
+    const auto TargetName = Ctx->getGlobalString(ModuleName + "$$" + FnName);
     LOG(out << "  target name: " << TargetName << "\n");
 
     assert(Sig->return_count() <= 1);
 
-    auto *TargetOperand = Ctx->getConstantSym(0, TargetName);
+    auto TargetOperand = Ctx->getConstantExternSym(TargetName);
 
     auto *Dest = Sig->return_count() > 0
                      ? makeVariable(toIceType(Sig->GetReturn()))
@@ -559,9 +809,10 @@ public:
     constexpr bool NoTailCall = false;
     auto *Call =
         InstCall::create(Func, NumArgs, Dest, TargetOperand, NoTailCall);
-    for (int i = 0; i < NumArgs; ++i) {
+    for (uint32_t i = 0; i < NumArgs; ++i) {
       // The builder reserves the first argument for the code object.
       LOG(out << "  args[" << i << "] = " << Args[i + 1] << "\n");
+      assert(Args[i + 1].toOperand()->getType() == toIceType(Sig->GetParam(i)));
       Call->addArg(Args[i + 1]);
     }
 
@@ -569,41 +820,140 @@ public:
     LOG(out << "Call Result = " << Node(Dest) << "\n");
     return OperandNode(Dest);
   }
-  Node CallIndirect(uint32_t Index, Node *Args) {
-    llvm::report_fatal_error("CallIndirect");
+  Node CallIndirect(uint32_t SigIndex, Node *Args) {
+    LOG(out << "CallIndirect(" << SigIndex << ")\n");
+    // TODO(eholk): Compile to something better than a switch.
+    const auto *Module = this->Module->module;
+    assert(Module);
+    const auto &IndirectTable = Module->function_table;
+
+    // TODO(eholk): This should probably actually call abort instead.
+    auto *Abort = Func->makeNode();
+    Abort->appendInst(InstUnreachable::create(Func));
+
+    assert(Args[0].toOperand());
+
+    auto *Switch = InstSwitch::create(Func, IndirectTable.size(),
+                                      Args[0].toOperand(), Abort);
+    assert(Abort);
+
+    const bool HasReturn = Module->signatures[SigIndex]->return_count() != 0;
+    const Ice::Type DestTy =
+        HasReturn ? toIceType(Module->signatures[SigIndex]->GetReturn())
+                  : IceType_void;
+
+    auto *Dest = HasReturn ? makeVariable(DestTy) : nullptr;
+
+    auto *ExitNode = Func->makeNode();
+    auto *PhiInst =
+        HasReturn ? InstPhi::create(Func, IndirectTable.size(), Dest) : nullptr;
+
+    for (uint32_t Index = 0; Index < IndirectTable.size(); ++Index) {
+      const auto &Target = Module->functions[IndirectTable[Index]];
+
+      if (SigIndex == Target.sig_index) {
+        auto *CallNode = Func->makeNode();
+        auto *SavedControl = Control();
+        *ControlPtr = OperandNode(CallNode);
+        auto *Tmp = CallDirect(Target.func_index, Args).toOperand();
+        *ControlPtr = OperandNode(SavedControl);
+        if (PhiInst) {
+          PhiInst->addArgument(Tmp, CallNode);
+        }
+        CallNode->appendInst(InstBr::create(Func, ExitNode));
+        Switch->addBranch(Index, Index, CallNode);
+      } else {
+        Switch->addBranch(Index, Index, Abort);
+      }
+    }
+
+    if (PhiInst) {
+      ExitNode->appendInst(PhiInst);
+    }
+
+    Control()->appendInst(Switch);
+    *ControlPtr = OperandNode(ExitNode);
+    return OperandNode(Dest);
+  }
+  Node Invert(Node Node) {
+    (void)Node;
+    llvm::report_fatal_error("Invert");
   }
-  Node Invert(Node Node) { llvm::report_fatal_error("Invert"); }
-  Node FunctionTable() { llvm::report_fatal_error("FunctionTable"); }
 
   //-----------------------------------------------------------------------
   // Operations that concern the linear memory.
   //-----------------------------------------------------------------------
-  Node MemSize(uint32_t Offset) { llvm::report_fatal_error("MemSize"); }
-  Node LoadGlobal(uint32_t Index) { llvm::report_fatal_error("LoadGlobal"); }
+  Node MemSize(uint32_t Offset) {
+    (void)Offset;
+    llvm::report_fatal_error("MemSize");
+  }
+  Node LoadGlobal(uint32_t Index) {
+    (void)Index;
+    llvm::report_fatal_error("LoadGlobal");
+  }
   Node StoreGlobal(uint32_t Index, Node Val) {
+    (void)Index;
+    (void)Val;
     llvm::report_fatal_error("StoreGlobal");
   }
+
+  Operand *sanitizeAddress(Operand *Base, uint32_t Offset) {
+    // first, add the index and the offset together.
+    if (0 != Offset) {
+      auto *Addr = makeVariable(IceType_i32);
+      auto *OffsetConstant = Ctx->getConstantInt32(Offset);
+      Control()->appendInst(InstArithmetic::create(Func, InstArithmetic::Add,
+                                                   Addr, Base, OffsetConstant));
+      Base = Addr;
+    }
+
+    SizeT MemSize = Module->module->min_mem_pages * (16 << 10);
+    auto *WrappedAddr = makeVariable(IceType_i32);
+    Control()->appendInst(
+        InstArithmetic::create(Func, InstArithmetic::Add, WrappedAddr, Base,
+                               Ctx->getConstantInt32(MemSize)));
+
+    auto ClampedAddr = makeVariable(IceType_i32);
+    Control()->appendInst(
+        InstArithmetic::create(Func, InstArithmetic::And, ClampedAddr, Base,
+                               Ctx->getConstantInt32(MemSize - 1)));
+
+    auto RealAddr = Func->makeVariable(IceType_i32);
+    auto MemBase = Ctx->getConstantSym(0, Ctx->getGlobalString("WASM_MEMORY"));
+    Control()->appendInst(InstArithmetic::create(
+        Func, InstArithmetic::Add, RealAddr, ClampedAddr, MemBase));
+    return RealAddr;
+  }
+
   Node LoadMem(wasm::LocalType Type, MachineType MemType, Node Index,
                uint32_t Offset) {
     LOG(out << "LoadMem(" << Index << "[" << Offset << "]) = ");
 
-    // first, add the index and the offset together.
-    auto *OffsetConstant = Ctx->getConstantInt32(Offset);
-    auto *Addr = makeVariable(IceType_i32);
-    Control()->appendInst(InstArithmetic::create(Func, InstArithmetic::Add,
-                                                 Addr, Index, OffsetConstant));
+    auto *RealAddr = sanitizeAddress(Index, Offset);
 
-    // then load the memory
     auto *LoadResult = makeVariable(toIceType(MemType));
-    Control()->appendInst(InstLoad::create(Func, LoadResult, Addr));
+    Control()->appendInst(InstLoad::create(Func, LoadResult, RealAddr));
 
     // and cast, if needed
     Ice::Variable *Result = nullptr;
     if (toIceType(Type) != toIceType(MemType)) {
-      Result = makeVariable(toIceType(Type));
+      auto DestType = toIceType(Type);
+      Result = makeVariable(DestType);
       // TODO(eholk): handle signs correctly.
-      Control()->appendInst(
-          InstCast::create(Func, InstCast::Sext, Result, LoadResult));
+      if (isScalarIntegerType(DestType)) {
+        if (MemType.IsSigned()) {
+          Control()->appendInst(
+              InstCast::create(Func, InstCast::Sext, Result, LoadResult));
+        } else {
+          Control()->appendInst(
+              InstCast::create(Func, InstCast::Zext, Result, LoadResult));
+        }
+      } else if (isScalarFloatingType(DestType)) {
+        Control()->appendInst(
+            InstCast::create(Func, InstCast::Sitofp, Result, LoadResult));
+      } else {
+        llvm::report_fatal_error("Unsupported type for memory load");
+      }
     } else {
       Result = LoadResult;
     }
@@ -615,13 +965,7 @@ public:
     LOG(out << "StoreMem(" << Index << "[" << Offset << "] = " << Val << ")"
             << "\n");
 
-    // TODO(eholk): surely there is a better way to do this.
-
-    // first, add the index and the offset together.
-    auto *OffsetConstant = Ctx->getConstantInt32(Offset);
-    auto *Addr = makeVariable(IceType_i32);
-    Control()->appendInst(InstArithmetic::create(Func, InstArithmetic::Add,
-                                                 Addr, Index, OffsetConstant));
+    auto *RealAddr = sanitizeAddress(Index, Offset);
 
     // cast the value to the right type, if needed
     Operand *StoreVal = nullptr;
@@ -635,10 +979,11 @@ public:
     }
 
     // then store the memory
-    Control()->appendInst(InstStore::create(Func, StoreVal, Addr));
+    Control()->appendInst(InstStore::create(Func, StoreVal, RealAddr));
   }
 
-  static void PrintDebugName(Node node) {
+  static void PrintDebugName(OperandNode Node) {
+    (void)Node;
     llvm::report_fatal_error("PrintDebugName");
   }
 
@@ -705,36 +1050,33 @@ private:
   }
 };
 
-std::string fnNameFromId(uint32_t Id) {
-  return std::string("fn") + to_string(Id);
-}
-
 std::unique_ptr<Cfg> WasmTranslator::translateFunction(Zone *Zone,
-                                                       FunctionEnv *Env,
-                                                       const byte *Base,
-                                                       const byte *Start,
-                                                       const byte *End) {
+                                                       FunctionBody &Body) {
   OstreamLocker L1(Ctx);
   auto Func = Cfg::create(Ctx, getNextSequenceNumber());
   Ice::CfgLocalAllocatorScope L2(Func.get());
 
-  // TODO: parse the function signature...
+  // TODO(eholk): parse the function signature...
+
+  Func->setEntryNode(Func->makeNode());
 
   IceBuilder Builder(Func.get());
-  LR_WasmDecoder<OperandNode, IceBuilder> Decoder(Zone, &Builder);
+  SR_WasmDecoder<OperandNode, IceBuilder> Decoder(Zone, &Builder, Body);
 
   LOG(out << getFlags().getDefaultGlobalPrefix() << "\n");
-  Decoder.Decode(Env, Base, Start, End);
+  Decoder.Decode();
 
   // We don't always know where the incoming branches are in phi nodes, so this
   // function finds them.
   Func->fixPhiNodes();
 
+  Func->computeInOutEdges();
+
   return Func;
 }
 
 WasmTranslator::WasmTranslator(GlobalContext *Ctx)
-    : Translator(Ctx), BufferSize(24 << 10), Buffer(new uint8_t[24 << 10]) {
+    : Translator(Ctx), Buffer(new uint8_t[24 << 10]), BufferSize(24 << 10) {
   // TODO(eholk): compute the correct buffer size. This uses 24k by default,
   // which has been big enough for testing but is not a general solution.
 }
@@ -761,6 +1103,8 @@ void WasmTranslator::translate(
 
   LOG(out << "Module info:"
           << "\n");
+  LOG(out << "  min_mem_pages:           " << Module->min_mem_pages << "\n");
+  LOG(out << "  max_mem_pages:           " << Module->max_mem_pages << "\n");
   LOG(out << "  number of globals:       " << Module->globals.size() << "\n");
   LOG(out << "  number of signatures:    " << Module->signatures.size()
           << "\n");
@@ -769,15 +1113,56 @@ void WasmTranslator::translate(
           << "\n");
   LOG(out << "  function table size:     " << Module->function_table.size()
           << "\n");
+  LOG(out << "  import table size:       " << Module->import_table.size()
+          << "\n");
+  LOG(out << "  export table size:       " << Module->export_table.size()
+          << "\n");
 
-  ModuleEnv ModuleEnv;
-  ModuleEnv.module = Module;
+  LOG(out << "\n"
+          << "Data segment information:"
+          << "\n");
+  uint32_t Id = 0;
+  for (const auto Seg : Module->data_segments) {
+    LOG(out << Id << ":  (" << Seg.source_offset << ", " << Seg.source_size
+            << ") => " << Seg.dest_addr);
+    if (Seg.init) {
+      LOG(out << " init\n");
+    } else {
+      LOG(out << "\n");
+    }
+    Id++;
+  }
+
+  LOG(out << "\n"
+          << "Import information:"
+          << "\n");
+  for (const auto Import : Module->import_table) {
+    auto ModuleName = toStdString(
+        Module->GetName(Import.module_name_offset, Import.module_name_length));
+    auto FnName = toStdString(Module->GetName(Import.function_name_offset,
+                                              Import.function_name_length));
+    LOG(out << "  " << Import.sig_index << ": " << ModuleName << "::" << FnName
+            << "\n");
+  }
+
+  LOG(out << "\n"
+          << "Export information:"
+          << "\n");
+  for (const auto Export : Module->export_table) {
+    LOG(out << "  " << Export.func_index << ": "
+            << toStdString(
+                   Module->GetName(Export.name_offset, Export.name_length))
+            << " (" << Export.name_offset << ", " << Export.name_length << ")");
+    LOG(out << "\n");
+  }
 
   LOG(out << "\n"
           << "Function information:"
           << "\n");
   for (const auto F : Module->functions) {
-    LOG(out << "  " << F.name_offset << ": " << Module->GetName(F.name_offset));
+    LOG(out << "  " << F.func_index << ": "
+            << toStdString(Module->GetName(F.name_offset, F.name_length))
+            << " (" << F.name_offset << ", " << F.name_length << ")");
     if (F.exported)
       LOG(out << " export");
     if (F.external)
@@ -785,29 +1170,76 @@ void WasmTranslator::translate(
     LOG(out << "\n");
   }
 
-  FunctionEnv Fenv;
-  Fenv.module = &ModuleEnv;
+  LOG(out << "\n"
+          << "Indirect table:"
+          << "\n");
+  for (uint32_t F : Module->function_table) {
+    LOG(out << "  " << F << ": " << getFunctionName(Module, F) << "\n");
+  }
+
+  ModuleEnv ModuleEnv;
+  ModuleEnv.module = Module;
+
+  FunctionBody Body;
+  Body.module = &ModuleEnv;
 
   LOG(out << "Translating " << IRFilename << "\n");
 
+  {
+    unique_ptr<VariableDeclarationList> Globals =
+        makeUnique<VariableDeclarationList>();
+
+    // Global variables, etc go here.
+    auto *WasmMemory = VariableDeclaration::createExternal(Globals.get());
+    WasmMemory->setName(Ctx->getGlobalString("WASM_MEMORY"));
+
+    // Fill in the segments
+    SizeT WritePtr = 0;
+    for (const auto Seg : Module->data_segments) {
+      // fill in gaps with zero.
+      if (Seg.dest_addr > WritePtr) {
+        WasmMemory->addInitializer(VariableDeclaration::ZeroInitializer::create(
+            Globals.get(), Seg.dest_addr - WritePtr));
+        WritePtr = Seg.dest_addr;
+      }
+
+      // Add the data
+      WasmMemory->addInitializer(VariableDeclaration::DataInitializer::create(
+          Globals.get(), reinterpret_cast<const char *>(Module->module_start) +
+                             Seg.source_offset,
+          Seg.source_size));
+
+      WritePtr += Seg.source_size;
+    }
+
+    // Pad the rest with zeros
+    SizeT DataSize = Module->min_mem_pages * (64 << 10);
+    if (WritePtr < DataSize) {
+      WasmMemory->addInitializer(VariableDeclaration::ZeroInitializer::create(
+          Globals.get(), DataSize - WritePtr));
+    }
+
+    WasmMemory->addInitializer(VariableDeclaration::ZeroInitializer::create(
+        Globals.get(), Module->min_mem_pages * (64 << 10)));
+
+    Globals->push_back(WasmMemory);
+
+    lowerGlobals(std::move(Globals));
+  }
+
   // Translate each function.
-  uint32_t Id = 0;
   for (const auto Fn : Module->functions) {
-    std::string NewName = fnNameFromId(Id++);
-    LOG(out << "  " << Fn.name_offset << ": " << Module->GetName(Fn.name_offset)
-            << " -> " << NewName << "...");
-
-    Fenv.sig = Fn.sig;
-    Fenv.local_i32_count = Fn.local_i32_count;
-    Fenv.local_i64_count = Fn.local_i64_count;
-    Fenv.local_f32_count = Fn.local_f32_count;
-    Fenv.local_f64_count = Fn.local_f64_count;
-    Fenv.SumLocals();
-
-    auto Func = translateFunction(&Zone, &Fenv, Buffer.get(),
-                                  Buffer.get() + Fn.code_start_offset,
-                                  Buffer.get() + Fn.code_end_offset);
-    Func->setFunctionName(Ctx->getGlobalString(NewName));
+    const auto FnName = getFunctionName(Module, Fn.func_index);
+
+    LOG(out << "  " << Fn.func_index << ": " << FnName << "...");
+
+    Body.sig = Fn.sig;
+    Body.base = Buffer.get();
+    Body.start = Buffer.get() + Fn.code_start_offset;
+    Body.end = Buffer.get() + Fn.code_end_offset;
+
+    auto Func = translateFunction(&Zone, Body);
+    Func->setFunctionName(Ctx->getGlobalString(FnName));
 
     Ctx->optQueueBlockingPush(makeUnique<CfgOptWorkItem>(std::move(Func)));
     LOG(out << "done.\n");