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* Copyright 2016 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "include/core/SkSpan.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkTArray.h"
#include "src/sksl/SkSLIntrinsicList.h"
#include "src/sksl/ir/SkSLIRNode.h"
#include "src/sksl/ir/SkSLSymbol.h"
#include <memory>
#include <string>
#include <string_view>
namespace SkSL {
class Context;
class ExpressionArray;
class FunctionDefinition;
class Position;
class Type;
class Variable;
struct Modifiers;
* A function declaration (not a definition -- does not contain a body).
class FunctionDeclaration final : public Symbol {
inline static constexpr Kind kIRNodeKind = Kind::kFunctionDeclaration;
FunctionDeclaration(Position pos,
const Modifiers* modifiers,
std::string_view name,
skia_private::TArray<Variable*> parameters,
const Type* returnType,
bool builtin);
static FunctionDeclaration* Convert(const Context& context,
Position pos,
Position modifiersPos,
const Modifiers* modifiers,
std::string_view name,
skia_private::TArray<std::unique_ptr<Variable>> parameters,
Position returnTypePos,
const Type* returnType);
void addParametersToSymbolTable(const Context& context);
const Modifiers& modifiers() const {
return *fModifiers;
void setModifiers(const Modifiers* m) {
fModifiers = m;
const FunctionDefinition* definition() const {
return fDefinition;
void setDefinition(const FunctionDefinition* definition) {
fDefinition = definition;
fIntrinsicKind = kNotIntrinsic;
void setNextOverload(FunctionDeclaration* overload) {
SkASSERT(!overload || overload->name() == this->name());
fNextOverload = overload;
SkSpan<Variable* const> parameters() const {
return fParameters;
const Type& returnType() const {
return *fReturnType;
bool isBuiltin() const {
return fBuiltin;
bool isMain() const {
return fIsMain;
IntrinsicKind intrinsicKind() const {
return fIntrinsicKind;
bool isIntrinsic() const {
return this->intrinsicKind() != kNotIntrinsic;
const FunctionDeclaration* nextOverload() const {
return fNextOverload;
FunctionDeclaration* mutableNextOverload() const {
return fNextOverload;
std::string mangledName() const;
std::string description() const override;
bool matches(const FunctionDeclaration& f) const;
* Determine the effective types of this function's parameters and return value when called with
* the given arguments. This is relevant for functions with generic parameter types, where this
* will collapse the generic types down into specific concrete types.
* Returns true if it was able to select a concrete set of types for the generic function, false
* if there is no possible way this can match the argument types. Note that even a true return
* does not guarantee that the function can be successfully called with those arguments, merely
* indicates that an attempt should be made. If false is returned, the state of
* outParameterTypes and outReturnType are undefined.
* This always assumes narrowing conversions are *allowed*. The calling code needs to verify
* that each argument can actually be coerced to the final parameter type, respecting the
* narrowing-conversions flag. This is handled in callCost(), or in convertCall() (via coerce).
using ParamTypes = skia_private::STArray<8, const Type*>;
bool determineFinalTypes(const ExpressionArray& arguments,
ParamTypes* outParameterTypes,
const Type** outReturnType) const;
const FunctionDefinition* fDefinition;
FunctionDeclaration* fNextOverload = nullptr;
const Modifiers* fModifiers;
skia_private::TArray<Variable*> fParameters;
const Type* fReturnType;
bool fBuiltin;
bool fIsMain;
mutable IntrinsicKind fIntrinsicKind = kNotIntrinsic;
using INHERITED = Symbol;
} // namespace SkSL