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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/private/SkSLModifiers.h"
#include "include/private/SkSLProgramKind.h"
#include "include/private/SkSLSymbol.h"
#include "include/private/SkTArray.h"
#include "src/sksl/SkSLIntrinsicList.h"
#include "src/sksl/ir/SkSLExpression.h"
#include "src/sksl/ir/SkSLSymbolTable.h"
#include "src/sksl/ir/SkSLType.h"
#include "src/sksl/ir/SkSLVariable.h"
namespace SkSL {
class FunctionDefinition;
// This enum holds every intrinsic supported by SkSL.
#define SKSL_INTRINSIC(name) k_##name##_IntrinsicKind,
enum IntrinsicKind {
kNotIntrinsic = -1,
* A function declaration (not a definition -- does not contain a body).
class FunctionDeclaration final : public Symbol {
static constexpr Kind kSymbolKind = Kind::kFunctionDeclaration;
FunctionDeclaration(int offset,
const Modifiers* modifiers,
skstd::string_view name,
std::vector<const Variable*> parameters,
const Type* returnType,
bool builtin);
static const FunctionDeclaration* Convert(const Context& context,
SymbolTable& symbols,
int offset,
const Modifiers* modifiers,
skstd::string_view name,
std::vector<std::unique_ptr<Variable>> parameters,
const Type* returnType,
bool isBuiltin);
const Modifiers& modifiers() const {
return *fModifiers;
const FunctionDefinition* definition() const {
return fDefinition;
void setDefinition(const FunctionDefinition* definition) const {
fDefinition = definition;
fIntrinsicKind = kNotIntrinsic;
const std::vector<const Variable*>& 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;
String mangledName() const;
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 = SkSTArray<8, const Type*>;
bool determineFinalTypes(const ExpressionArray& arguments,
ParamTypes* outParameterTypes,
const Type** outReturnType) const;
mutable const FunctionDefinition* fDefinition;
const Modifiers* fModifiers;
std::vector<const Variable*> fParameters;
const Type* fReturnType;
bool fBuiltin;
bool fIsMain;
mutable IntrinsicKind fIntrinsicKind = kNotIntrinsic;
friend class SkSL::dsl::DSLFunction;
using INHERITED = Symbol;
} // namespace SkSL