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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSLVariableReference.h"
#include "SkSLConstructor.h"
#include "SkSLFloatLiteral.h"
#include "SkSLIRGenerator.h"
#include "SkSLSetting.h"
namespace SkSL {
VariableReference::VariableReference(int offset, const Variable& variable, RefKind refKind)
: INHERITED(offset, kVariableReference_Kind, variable.fType)
, fVariable(variable)
, fRefKind(refKind) {
if (refKind != kRead_RefKind) {
fVariable.fWriteCount++;
}
if (refKind != kWrite_RefKind) {
fVariable.fReadCount++;
}
}
VariableReference::~VariableReference() {
if (fRefKind != kRead_RefKind) {
fVariable.fWriteCount--;
}
if (fRefKind != kWrite_RefKind) {
fVariable.fReadCount--;
}
}
void VariableReference::setRefKind(RefKind refKind) {
if (fRefKind != kRead_RefKind) {
fVariable.fWriteCount--;
}
if (fRefKind != kWrite_RefKind) {
fVariable.fReadCount--;
}
if (refKind != kRead_RefKind) {
fVariable.fWriteCount++;
}
if (refKind != kWrite_RefKind) {
fVariable.fReadCount++;
}
fRefKind = refKind;
}
std::unique_ptr<Expression> VariableReference::copy_constant(const IRGenerator& irGenerator,
const Expression* expr) {
SkASSERT(expr->isConstant());
switch (expr->fKind) {
case Expression::kIntLiteral_Kind:
return std::unique_ptr<Expression>(new IntLiteral(irGenerator.fContext,
-1,
((IntLiteral*) expr)->fValue));
case Expression::kFloatLiteral_Kind:
return std::unique_ptr<Expression>(new FloatLiteral(
irGenerator.fContext,
-1,
((FloatLiteral*) expr)->fValue));
case Expression::kBoolLiteral_Kind:
return std::unique_ptr<Expression>(new BoolLiteral(irGenerator.fContext,
-1,
((BoolLiteral*) expr)->fValue));
case Expression::kConstructor_Kind: {
const Constructor* c = (const Constructor*) expr;
std::vector<std::unique_ptr<Expression>> args;
for (const auto& arg : c->fArguments) {
args.push_back(copy_constant(irGenerator, arg.get()));
}
return std::unique_ptr<Expression>(new Constructor(-1, c->fType,
std::move(args)));
}
case Expression::kSetting_Kind: {
const Setting* s = (const Setting*) expr;
return std::unique_ptr<Expression>(new Setting(-1, s->fName,
copy_constant(irGenerator,
s->fValue.get())));
}
default:
ABORT("unsupported constant\n");
}
}
std::unique_ptr<Expression> VariableReference::constantPropagate(const IRGenerator& irGenerator,
const DefinitionMap& definitions) {
if (fRefKind != kRead_RefKind) {
return nullptr;
}
if (irGenerator.fKind == Program::kPipelineStage_Kind &&
fVariable.fStorage == Variable::kGlobal_Storage &&
(fVariable.fModifiers.fFlags & Modifiers::kIn_Flag)) {
return irGenerator.getArg(fOffset, fVariable.fName);
}
if ((fVariable.fModifiers.fFlags & Modifiers::kConst_Flag) && fVariable.fInitialValue &&
fVariable.fInitialValue->isConstant()) {
return copy_constant(irGenerator, fVariable.fInitialValue);
}
auto exprIter = definitions.find(&fVariable);
if (exprIter != definitions.end() && exprIter->second &&
(*exprIter->second)->isConstant()) {
return copy_constant(irGenerator, exprIter->second->get());
}
return nullptr;
}
} // namespace
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