diff --git a/src/tint/ast/builtin_value.h b/src/tint/ast/builtin_value.h
index eb45b39..f7dd660 100644
--- a/src/tint/ast/builtin_value.h
+++ b/src/tint/ast/builtin_value.h
@@ -27,7 +27,7 @@
 
 namespace tint::ast {
 
-/// Storage class of a given pointer.
+/// Builtin value defined with `@builtin(<name>)`.
 enum class BuiltinValue {
     kInvalid,
     kFragDepth,
diff --git a/src/tint/ast/builtin_value.h.tmpl b/src/tint/ast/builtin_value.h.tmpl
index 1985305..ea63d56 100644
--- a/src/tint/ast/builtin_value.h.tmpl
+++ b/src/tint/ast/builtin_value.h.tmpl
@@ -18,7 +18,7 @@
 
 namespace tint::ast {
 
-/// Storage class of a given pointer.
+/// Builtin value defined with `@builtin(<name>)`.
 {{ Eval "DeclareEnum" $enum}}
 
 }  // namespace tint::ast
diff --git a/src/tint/ast/interpolate_attribute.cc b/src/tint/ast/interpolate_attribute.cc
index 29e3bfe..7c89ee1 100644
--- a/src/tint/ast/interpolate_attribute.cc
+++ b/src/tint/ast/interpolate_attribute.cc
@@ -12,6 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   src/tint/ast/interpolate_attribute.cc.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
 #include "src/tint/ast/interpolate_attribute.h"
 
 #include <string>
@@ -41,44 +49,64 @@
     return ctx->dst->create<InterpolateAttribute>(src, type, sampling);
 }
 
-std::ostream& operator<<(std::ostream& out, InterpolationType type) {
-    switch (type) {
-        case InterpolationType::kPerspective: {
-            out << "perspective";
-            break;
-        }
-        case InterpolationType::kLinear: {
-            out << "linear";
-            break;
-        }
-        case InterpolationType::kFlat: {
-            out << "flat";
-            break;
-        }
+/// ParseInterpolationType parses a InterpolationType from a string.
+/// @param str the string to parse
+/// @returns the parsed enum, or InterpolationType::kInvalid if the string could not be parsed.
+InterpolationType ParseInterpolationType(std::string_view str) {
+    if (str == "flat") {
+        return InterpolationType::kFlat;
     }
-    return out;
+    if (str == "linear") {
+        return InterpolationType::kLinear;
+    }
+    if (str == "perspective") {
+        return InterpolationType::kPerspective;
+    }
+    return InterpolationType::kInvalid;
 }
 
-std::ostream& operator<<(std::ostream& out, InterpolationSampling sampling) {
-    switch (sampling) {
-        case InterpolationSampling::kNone: {
-            out << "none";
-            break;
-        }
-        case InterpolationSampling::kCenter: {
-            out << "center";
-            break;
-        }
-        case InterpolationSampling::kCentroid: {
-            out << "centroid";
-            break;
-        }
-        case InterpolationSampling::kSample: {
-            out << "sample";
-            break;
-        }
+std::ostream& operator<<(std::ostream& out, InterpolationType value) {
+    switch (value) {
+        case InterpolationType::kInvalid:
+            return out << "invalid";
+        case InterpolationType::kFlat:
+            return out << "flat";
+        case InterpolationType::kLinear:
+            return out << "linear";
+        case InterpolationType::kPerspective:
+            return out << "perspective";
     }
-    return out;
+    return out << "<unknown>";
+}
+
+/// ParseInterpolationSampling parses a InterpolationSampling from a string.
+/// @param str the string to parse
+/// @returns the parsed enum, or InterpolationSampling::kInvalid if the string could not be parsed.
+InterpolationSampling ParseInterpolationSampling(std::string_view str) {
+    if (str == "center") {
+        return InterpolationSampling::kCenter;
+    }
+    if (str == "centroid") {
+        return InterpolationSampling::kCentroid;
+    }
+    if (str == "sample") {
+        return InterpolationSampling::kSample;
+    }
+    return InterpolationSampling::kInvalid;
+}
+
+std::ostream& operator<<(std::ostream& out, InterpolationSampling value) {
+    switch (value) {
+        case InterpolationSampling::kInvalid:
+            return out << "invalid";
+        case InterpolationSampling::kCenter:
+            return out << "center";
+        case InterpolationSampling::kCentroid:
+            return out << "centroid";
+        case InterpolationSampling::kSample:
+            return out << "sample";
+    }
+    return out << "<unknown>";
 }
 
 }  // namespace tint::ast
diff --git a/src/tint/ast/interpolate_attribute.cc.tmpl b/src/tint/ast/interpolate_attribute.cc.tmpl
new file mode 100644
index 0000000..b6f0b35
--- /dev/null
+++ b/src/tint/ast/interpolate_attribute.cc.tmpl
@@ -0,0 +1,50 @@
+{{- /*
+--------------------------------------------------------------------------------
+Template file for use with tools/src/cmd/gen to generate builtin_value.cc
+
+See:
+* tools/src/cmd/gen for structures used by this template
+* https://golang.org/pkg/text/template/ for documentation on the template syntax
+--------------------------------------------------------------------------------
+*/ -}}
+
+{{- Import "src/tint/templates/enums.tmpl.inc" -}}
+
+#include "src/tint/ast/interpolate_attribute.h"
+
+#include <string>
+
+#include "src/tint/program_builder.h"
+
+TINT_INSTANTIATE_TYPEINFO(tint::ast::InterpolateAttribute);
+
+namespace tint::ast {
+
+InterpolateAttribute::InterpolateAttribute(ProgramID pid,
+                                           NodeID nid,
+                                           const Source& src,
+                                           InterpolationType ty,
+                                           InterpolationSampling smpl)
+    : Base(pid, nid, src), type(ty), sampling(smpl) {}
+
+InterpolateAttribute::~InterpolateAttribute() = default;
+
+std::string InterpolateAttribute::Name() const {
+    return "interpolate";
+}
+
+const InterpolateAttribute* InterpolateAttribute::Clone(CloneContext* ctx) const {
+    // Clone arguments outside of create() call to have deterministic ordering
+    auto src = ctx->Clone(source);
+    return ctx->dst->create<InterpolateAttribute>(src, type, sampling);
+}
+
+{{ Eval "ParseEnum" (Sem.Enum "interpolation_type")}}
+
+{{ Eval "EnumOStream" (Sem.Enum "interpolation_type")}}
+
+{{ Eval "ParseEnum" (Sem.Enum "interpolation_sampling")}}
+
+{{ Eval "EnumOStream" (Sem.Enum "interpolation_sampling")}}
+
+}  // namespace tint::ast
diff --git a/src/tint/ast/interpolate_attribute.h b/src/tint/ast/interpolate_attribute.h
index 4f9ea9d..c6b4af0 100644
--- a/src/tint/ast/interpolate_attribute.h
+++ b/src/tint/ast/interpolate_attribute.h
@@ -1,4 +1,4 @@
-// Copyright 2021 The Tint Authors.
+// Copyright 2022 The Tint Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,6 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+////////////////////////////////////////////////////////////////////////////////
+// File generated by tools/src/cmd/gen
+// using the template:
+//   src/tint/ast/interpolate_attribute.h.tmpl
+//
+// Do not modify this file directly
+////////////////////////////////////////////////////////////////////////////////
+
 #ifndef SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_
 #define SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_
 
@@ -23,10 +31,52 @@
 namespace tint::ast {
 
 /// The interpolation type.
-enum class InterpolationType { kPerspective, kLinear, kFlat };
+enum class InterpolationType {
+    kInvalid,
+    kFlat,
+    kLinear,
+    kPerspective,
+};
+
+/// @param out the std::ostream to write to
+/// @param value the InterpolationType
+/// @returns `out` so calls can be chained
+std::ostream& operator<<(std::ostream& out, InterpolationType value);
+
+/// ParseInterpolationType parses a InterpolationType from a string.
+/// @param str the string to parse
+/// @returns the parsed enum, or InterpolationType::kInvalid if the string could not be parsed.
+InterpolationType ParseInterpolationType(std::string_view str);
+
+constexpr const char* kInterpolationTypeStrings[] = {
+    "flat",
+    "linear",
+    "perspective",
+};
 
 /// The interpolation sampling.
-enum class InterpolationSampling { kNone = -1, kCenter, kCentroid, kSample };
+enum class InterpolationSampling {
+    kInvalid,
+    kCenter,
+    kCentroid,
+    kSample,
+};
+
+/// @param out the std::ostream to write to
+/// @param value the InterpolationSampling
+/// @returns `out` so calls can be chained
+std::ostream& operator<<(std::ostream& out, InterpolationSampling value);
+
+/// ParseInterpolationSampling parses a InterpolationSampling from a string.
+/// @param str the string to parse
+/// @returns the parsed enum, or InterpolationSampling::kInvalid if the string could not be parsed.
+InterpolationSampling ParseInterpolationSampling(std::string_view str);
+
+constexpr const char* kInterpolationSamplingStrings[] = {
+    "center",
+    "centroid",
+    "sample",
+};
 
 /// An interpolate attribute
 class InterpolateAttribute final : public Castable<InterpolateAttribute, Attribute> {
@@ -60,16 +110,6 @@
     const InterpolationSampling sampling;
 };
 
-/// @param out the std::ostream to write to
-/// @param type the interpolation type
-/// @return the std::ostream so calls can be chained
-std::ostream& operator<<(std::ostream& out, InterpolationType type);
-
-/// @param out the std::ostream to write to
-/// @param sampling the interpolation sampling
-/// @return the std::ostream so calls can be chained
-std::ostream& operator<<(std::ostream& out, InterpolationSampling sampling);
-
 }  // namespace tint::ast
 
 #endif  // SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_
diff --git a/src/tint/ast/interpolate_attribute.h.tmpl b/src/tint/ast/interpolate_attribute.h.tmpl
new file mode 100644
index 0000000..c225cb6
--- /dev/null
+++ b/src/tint/ast/interpolate_attribute.h.tmpl
@@ -0,0 +1,63 @@
+{{- /*
+--------------------------------------------------------------------------------
+Template file for use with tools/src/cmd/gen to generate interpolate_attribute.h
+
+See:
+* tools/src/cmd/gen for structures used by this template
+* https://golang.org/pkg/text/template/ for documentation on the template syntax
+--------------------------------------------------------------------------------
+*/ -}}
+
+{{- Import "src/tint/templates/enums.tmpl.inc" -}}
+
+#ifndef SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_
+#define SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_
+
+#include <ostream>
+#include <string>
+
+#include "src/tint/ast/attribute.h"
+
+namespace tint::ast {
+
+/// The interpolation type.
+{{ Eval "DeclareEnum" (Sem.Enum "interpolation_type") }}
+
+/// The interpolation sampling.
+{{ Eval "DeclareEnum" (Sem.Enum "interpolation_sampling") }}
+
+/// An interpolate attribute
+class InterpolateAttribute final : public Castable<InterpolateAttribute, Attribute> {
+  public:
+    /// Create an interpolate attribute.
+    /// @param pid the identifier of the program that owns this node
+    /// @param nid the unique node identifier
+    /// @param src the source of this node
+    /// @param type the interpolation type
+    /// @param sampling the interpolation sampling
+    InterpolateAttribute(ProgramID pid,
+                         NodeID nid,
+                         const Source& src,
+                         InterpolationType type,
+                         InterpolationSampling sampling);
+    ~InterpolateAttribute() override;
+
+    /// @returns the WGSL name for the attribute
+    std::string Name() const override;
+
+    /// Clones this node and all transitive child nodes using the `CloneContext`
+    /// `ctx`.
+    /// @param ctx the clone context
+    /// @return the newly cloned node
+    const InterpolateAttribute* Clone(CloneContext* ctx) const override;
+
+    /// The interpolation type
+    const InterpolationType type;
+
+    /// The interpolation sampling
+    const InterpolationSampling sampling;
+};
+
+}  // namespace tint::ast
+
+#endif  // SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_