[WGSL] [WASM] Add reflection endpoints + Fix bit manipulation operations (#5499)

* Add key reflection endpoints for WASM

* Fix WGSL output around bit-manipulation operators

* format code

* Fix pointer ownership

* fix formatting

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
Co-authored-by: Yong He <yonghe@outlook.com>

5 files changed, 170 insertions, 15 deletions

diff --git a/source/slang-wasm/slang-wasm-bindings.cpp b/source/slang-wasm/slang-wasm-bindings.cpp
index 326ef9ff2..e980cd608 100644
--- a/source/slang-wasm/slang-wasm-bindings.cpp
+++ b/source/slang-wasm/slang-wasm-bindings.cpp
@@ -43,11 +43,44 @@ EMSCRIPTEN_BINDINGS(slang)
         .function("getEntryPointCodeBlob", &slang::wgsl::ComponentType::getEntryPointCodeBlob)
         .function("getTargetCodeBlob", &slang::wgsl::ComponentType::getTargetCodeBlob)
         .function("getTargetCode", &slang::wgsl::ComponentType::getTargetCode)
+        .function("getLayout", &slang::wgsl::ComponentType::getLayout, allow_raw_pointers())
         .function(
             "loadStrings",
             &slang::wgsl::ComponentType::loadStrings,
             return_value_policy::take_ownership());
 
+    class_<slang::wgsl::TypeLayoutReflection>("TypeLayoutReflection")
+        .function(
+            "getDescriptorSetDescriptorRangeType",
+            &slang::wgsl::TypeLayoutReflection::getDescriptorSetDescriptorRangeType);
+
+    class_<slang::wgsl::VariableLayoutReflection>("VariableLayoutReflection")
+        .function("getName", &slang::wgsl::VariableLayoutReflection::getName)
+        .function(
+            "getTypeLayout",
+            &slang::wgsl::VariableLayoutReflection::getTypeLayout,
+            allow_raw_pointers())
+        .function("getBindingIndex", &slang::wgsl::VariableLayoutReflection::getBindingIndex);
+
+    class_<slang::wgsl::ProgramLayout>("ProgramLayout")
+        .function("getParameterCount", &slang::wgsl::ProgramLayout::getParameterCount)
+        .function(
+            "getParameterByIndex",
+            &slang::wgsl::ProgramLayout::getParameterByIndex,
+            allow_raw_pointers())
+        .function(
+            "getGlobalParamsTypeLayout",
+            &slang::wgsl::ProgramLayout::getGlobalParamsTypeLayout,
+            allow_raw_pointers());
+
+    enum_<slang::BindingType>("BindingType")
+        .value("Unknown", slang::BindingType::Unknown)
+        .value("Texture", slang::BindingType::Texture)
+        .value("ConstantBuffer", slang::BindingType::ConstantBuffer)
+        .value("MutableRawBuffer", slang::BindingType::MutableRawBuffer)
+        .value("MutableTypedBuffer", slang::BindingType::MutableTypedBuffer)
+        .value("MutableTexture", slang::BindingType::MutableTexture);
+
     class_<slang::wgsl::Module, base<slang::wgsl::ComponentType>>("Module")
         .function(
             "findEntryPointByName",
diff --git a/source/slang-wasm/slang-wasm.cpp b/source/slang-wasm/slang-wasm.cpp
index be30f8394..f73e70ba0 100644
--- a/source/slang-wasm/slang-wasm.cpp
+++ b/source/slang-wasm/slang-wasm.cpp
@@ -386,6 +386,49 @@ HashedString* ComponentType::loadStrings()
     return hashedStrings;
 }
 
+ProgramLayout* ComponentType::getLayout(unsigned int targetIndex)
+{
+    return (slang::wgsl::ProgramLayout*)interface()->getLayout(targetIndex);
+}
+
+unsigned int ProgramLayout::getParameterCount()
+{
+    return interface()->getParameterCount();
+}
+
+VariableLayoutReflection* ProgramLayout::getParameterByIndex(unsigned int index)
+{
+    return (slang::wgsl::VariableLayoutReflection*)(interface()->getParameterByIndex(index));
+}
+
+TypeLayoutReflection* ProgramLayout::getGlobalParamsTypeLayout()
+{
+    return (slang::wgsl::TypeLayoutReflection*)(interface()->getGlobalParamsTypeLayout());
+}
+
+BindingType TypeLayoutReflection::getDescriptorSetDescriptorRangeType(
+    unsigned int setIndex,
+    unsigned int rangeIndex)
+{
+    return interface()->getDescriptorSetDescriptorRangeType(setIndex, rangeIndex);
+}
+
+std::string VariableLayoutReflection::getName()
+{
+    return interface()->getName();
+}
+
+TypeLayoutReflection* VariableLayoutReflection::getTypeLayout()
+{
+    return (slang::wgsl::TypeLayoutReflection*)(interface()->getTypeLayout());
+}
+
+unsigned int VariableLayoutReflection::getBindingIndex()
+{
+    return interface()->getBindingIndex();
+}
+
+
 namespace lsp
 {
 Position translate(Slang::LanguageServerProtocol::Position p)
diff --git a/source/slang-wasm/slang-wasm.h b/source/slang-wasm/slang-wasm.h
index c82976659..9e1e023a9 100644
--- a/source/slang-wasm/slang-wasm.h
+++ b/source/slang-wasm/slang-wasm.h
@@ -50,6 +50,40 @@ private:
 
 CompileTargets* getCompileTargets();
 
+
+class TypeLayoutReflection
+{
+public:
+    BindingType getDescriptorSetDescriptorRangeType(unsigned int setIndex, unsigned int rangeIndex);
+
+    slang::TypeLayoutReflection* interface() const { return (slang::TypeLayoutReflection*)this; }
+};
+
+class VariableLayoutReflection
+{
+public:
+    std::string getName();
+    slang::wgsl::TypeLayoutReflection* getTypeLayout();
+    unsigned int getBindingIndex();
+
+    slang::VariableLayoutReflection* interface() const
+    {
+        return (slang::VariableLayoutReflection*)this;
+    }
+};
+
+
+class ProgramLayout
+{
+public:
+    unsigned int getParameterCount();
+    slang::wgsl::VariableLayoutReflection* getParameterByIndex(unsigned int index);
+
+    slang::wgsl::TypeLayoutReflection* getGlobalParamsTypeLayout();
+
+    slang::ProgramLayout* interface() const { return (slang::ProgramLayout*)this; }
+};
+
 class ComponentType
 {
 public:
@@ -65,6 +99,8 @@ public:
     std::string getTargetCode(int targetIndex);
     emscripten::val getTargetCodeBlob(int targetIndex);
 
+    slang::wgsl::ProgramLayout* getLayout(unsigned int targetIndex);
+
     slang::IComponentType* interface() const { return m_interface; }
 
     HashedString* loadStrings();
diff --git a/source/slang/slang-emit-c-like.cpp b/source/slang/slang-emit-c-like.cpp
index 020c31fdc..790162c5b 100644
--- a/source/slang/slang-emit-c-like.cpp
+++ b/source/slang/slang-emit-c-like.cpp
@@ -693,6 +693,13 @@ bool CLikeSourceEmitter::maybeEmitParens(EmitOpInfo& outerPrec, const EmitOpInfo
     {
         needParens = true;
     }
+    // a ^ b * c => (a ^ b) * c
+    else if (
+        prec.rightPrecedence == EPrecedence::kEPrecedence_BitXor_Right &&
+        outerPrec.rightPrecedence == EPrecedence::kEPrecedence_Multiplicative_Left)
+    {
+        needParens = true;
+    }
 
     if (needParens)
     {
diff --git a/source/slang/slang-emit-wgsl.cpp b/source/slang/slang-emit-wgsl.cpp
index ca51f7e15..5df94f561 100644
--- a/source/slang/slang-emit-wgsl.cpp
+++ b/source/slang/slang-emit-wgsl.cpp
@@ -1304,28 +1304,64 @@ bool WGSLSourceEmitter::tryEmitInstExprImpl(IRInst* inst, const EmitOpInfo& inOu
             // https://www.w3.org/TR/WGSL/#bit-expr
             IRInst* const shiftAmount = inst->getOperand(1);
             IRType* const shiftAmountType = shiftAmount->getDataType();
-            if (shiftAmountType->getOp() == kIROp_IntType)
-            {
-                // Dawn complains about "mixing '<<' and '|' requires parenthesis", so let's
-                // add parenthesis.
-                m_writer->emit("(");
 
-                const auto emitOp = getEmitOpForOp(inst->getOp());
-                const auto info = getInfo(emitOp);
+            // Dawn complains about mixing '<<' and '|', '^' and a bunch of other bit operators
+            // without a paranthesis, so we'll always emit paranthesis around the shift amount.
+            //
 
-                const bool needClose = maybeEmitParens(outerPrec, info);
-                emitOperand(inst->getOperand(0), leftSide(outerPrec, info));
-                m_writer->emit(" ");
-                m_writer->emit(info.op);
-                m_writer->emit(" ");
+            m_writer->emit("(");
+
+            const auto emitOp = getEmitOpForOp(inst->getOp());
+            const auto info = getInfo(emitOp);
+
+            const bool needClose = maybeEmitParens(outerPrec, info);
+            emitOperand(inst->getOperand(0), leftSide(outerPrec, info));
+            m_writer->emit(" ");
+            m_writer->emit(info.op);
+            m_writer->emit(" ");
+
+            if (shiftAmountType->getOp() == kIROp_IntType)
+            {
                 m_writer->emit("bitcast<u32>(");
                 emitOperand(inst->getOperand(1), rightSide(outerPrec, info));
                 m_writer->emit(")");
-                maybeCloseParens(needClose);
-
+            }
+            else
+            {
+                m_writer->emit("(");
+                emitOperand(inst->getOperand(1), rightSide(outerPrec, info));
                 m_writer->emit(")");
-                return true;
             }
+
+            maybeCloseParens(needClose);
+
+            m_writer->emit(")");
+
+            return true;
+        }
+    case kIROp_BitXor:
+    case kIROp_BitOr:
+        {
+            // Emit bitwise operators with paranthesis to avoid precedence issues
+            const auto emitOp = getEmitOpForOp(inst->getOp());
+            const auto info = getInfo(emitOp);
+
+            m_writer->emit("(");
+
+            const bool needClose = maybeEmitParens(outerPrec, info);
+            emitOperand(inst->getOperand(0), leftSide(outerPrec, info));
+            m_writer->emit(" ");
+
+            m_writer->emit(info.op);
+
+            m_writer->emit(" (");
+            emitOperand(inst->getOperand(1), rightSide(outerPrec, info));
+            m_writer->emit(")");
+
+            maybeCloseParens(needClose);
+
+            m_writer->emit(")");
+            return true;
         }
         break;