1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/wasm/WasmConstants.h b/js/src/wasm/WasmConstants.h
index 0ce741b2d0..8d339d5cf3 100644
--- a/js/src/wasm/WasmConstants.h
+++ b/js/src/wasm/WasmConstants.h
@@ -94,6 +94,9 @@ enum class TypeCode {
   // A null reference in the func hierarchy.
   NullFuncRef = 0x73,  // SLEB128(-0x0D)
 
+  // A null reference in the exn hierarchy.
+  NullExnRef = 0x74,  // SLEB128(-0x0C)
+
   // A reference to any struct value.
   StructRef = 0x6b,  // SLEB128(-0x15)
 
@@ -994,6 +997,19 @@ struct BuiltinModuleIds {
 
 WASM_DECLARE_CACHEABLE_POD(BuiltinModuleIds)
 
+enum class StackSwitchKind {
+  SwitchToSuspendable,
+  SwitchToMain,
+  ContinueOnSuspendable,
+};
+
+enum class UpdateSuspenderStateAction {
+  Enter,
+  Suspend,
+  Resume,
+  Leave,
+};
+
 enum class MozOp {
   // ------------------------------------------------------------------------
   // These operators are emitted internally when compiling asm.js and are
@@ -1041,6 +1057,8 @@ enum class MozOp {
   // particular operation id. See BuiltinModuleFuncId above.
   CallBuiltinModuleFunc,
 
+  StackSwitch,
+
   Limit
 };
 
@@ -1092,6 +1110,7 @@ struct OpBytes {
 
 static const char NameSectionName[] = "name";
 static const char SourceMappingURLSectionName[] = "sourceMappingURL";
+static const char BranchHintingSectionName[] = "metadata.code.branch_hint";
 
 enum class NameType { Module = 0, Function = 1, Local = 2 };
 
@@ -1151,6 +1170,7 @@ static_assert(uint64_t(MaxArrayPayloadBytes) <
 static const unsigned MaxTryTableCatches = 10000;
 static const unsigned MaxBrTableElems = 1000000;
 static const unsigned MaxCodeSectionBytes = MaxModuleBytes;
+static const unsigned MaxBranchHintValue = 2;
 
 // 512KiB should be enough, considering how Rabaldr uses the stack and
 // what the standard limits are:
@@ -1163,6 +1183,21 @@ static const unsigned MaxCodeSectionBytes = MaxModuleBytes;
 
 static const unsigned MaxFrameSize = 512 * 1024;
 
+// Limit for the amount of stacks present in the runtime.
+static const size_t SuspendableStacksMaxCount = 100;
+
+// Max size of an allocated stack.
+static const size_t SuspendableStackSize = 0x100000;
+
+// Size of additional space at the top of a suspendable stack.
+// The space is allocated to C++ handlers such as error/trap handlers,
+// or stack snapshots utilities.
+static const size_t SuspendableRedZoneSize = 0x6000;
+
+// Total size of a suspendable stack to be reserved.
+static constexpr size_t SuspendableStackPlusRedZoneSize =
+    SuspendableStackSize + SuspendableRedZoneSize;
+
 // Asserted by Decoder::readVarU32.
 
 static const unsigned MaxVarU32DecodedBytes = 5;