BuiltInFunctionEmulator.cpp

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Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/compiler/translator/BuiltInFunctionEmulator.cpp

//
// Copyright 2002 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

#include "compiler/translator/BuiltInFunctionEmulator.h"
#include "angle_gl.h"
#include "compiler/translator/StaticType.h"
#include "compiler/translator/Symbol.h"
#include "compiler/translator/tree_util/IntermTraverse.h"

namespace sh
{

class BuiltInFunctionEmulator::BuiltInFunctionEmulationMarker : public TIntermTraverser
{
  public:
    BuiltInFunctionEmulationMarker(BuiltInFunctionEmulator &emulator)
        : TIntermTraverser(true, false, false), mEmulator(emulator)
    {}

    bool visitUnary(Visit visit, TIntermUnary *node) override
    {
        if (node->getFunction())
        {
            bool needToEmulate = mEmulator.setFunctionCalled(node->getFunction());
            if (needToEmulate)
                node->setUseEmulatedFunction();
        }
        return true;
    }

    bool visitAggregate(Visit visit, TIntermAggregate *node) override
    {
        // Here we handle all the built-in functions mapped to ops, not just the ones that are
        // currently identified as problematic.
        if (node->isConstructor() || node->isFunctionCall())
        {
            return true;
        }
        bool needToEmulate = mEmulator.setFunctionCalled(node->getFunction());
        if (needToEmulate)
            node->setUseEmulatedFunction();
        return true;
    }

  private:
    BuiltInFunctionEmulator &mEmulator;
};

BuiltInFunctionEmulator::BuiltInFunctionEmulator() {}

void BuiltInFunctionEmulator::addEmulatedFunction(const TSymbolUniqueId &uniqueId,
                                                  const char *emulatedFunctionDefinition)
{
    mEmulatedFunctions[uniqueId.get()] = std::string(emulatedFunctionDefinition);
}

void BuiltInFunctionEmulator::addEmulatedFunctionWithDependency(
    const TSymbolUniqueId &dependency,
    const TSymbolUniqueId &uniqueId,
    const char *emulatedFunctionDefinition)
{
    mEmulatedFunctions[uniqueId.get()]    = std::string(emulatedFunctionDefinition);
    mFunctionDependencies[uniqueId.get()] = dependency.get();
}

bool BuiltInFunctionEmulator::isOutputEmpty() const
{
    return (mFunctions.size() == 0);
}

void BuiltInFunctionEmulator::outputEmulatedFunctions(TInfoSinkBase &out) const
{
    for (const auto &function : mFunctions)
    {
        const char *body = findEmulatedFunction(function);
        ASSERT(body);
        out << body;
        out << "\n\n";
    }
}

const char *BuiltInFunctionEmulator::findEmulatedFunction(int uniqueId) const
{
    for (const auto &queryFunction : mQueryFunctions)
    {
        const char *result = queryFunction(uniqueId);
        if (result)
        {
            return result;
        }
    }

    const auto &result = mEmulatedFunctions.find(uniqueId);
    if (result != mEmulatedFunctions.end())
    {
        return result->second.c_str();
    }

    return nullptr;
}

bool BuiltInFunctionEmulator::setFunctionCalled(const TFunction *function)
{
    ASSERT(function != nullptr);
    return setFunctionCalled(function->uniqueId().get());
}

bool BuiltInFunctionEmulator::setFunctionCalled(int uniqueId)
{
    if (!findEmulatedFunction(uniqueId))
    {
        return false;
    }

    for (size_t i = 0; i < mFunctions.size(); ++i)
    {
        if (mFunctions[i] == uniqueId)
            return true;
    }
    // If the function depends on another, mark the dependency as called.
    auto dependency = mFunctionDependencies.find(uniqueId);
    if (dependency != mFunctionDependencies.end())
    {
        setFunctionCalled((*dependency).second);
    }
    mFunctions.push_back(uniqueId);
    return true;
}

void BuiltInFunctionEmulator::markBuiltInFunctionsForEmulation(TIntermNode *root)
{
    ASSERT(root);

    if (mEmulatedFunctions.empty() && mQueryFunctions.empty())
        return;

    BuiltInFunctionEmulationMarker marker(*this);
    root->traverse(&marker);
}

void BuiltInFunctionEmulator::cleanup()
{
    mFunctions.clear();
    mFunctionDependencies.clear();
}

void BuiltInFunctionEmulator::addFunctionMap(BuiltinQueryFunc queryFunc)
{
    mQueryFunctions.push_back(queryFunc);
}

// static
void BuiltInFunctionEmulator::WriteEmulatedFunctionName(TInfoSinkBase &out, const char *name)
{
    ASSERT(name[strlen(name) - 1] != '(');
    out << name << "_emu";
}

}  // namespace sh

kc3-lang/angle/src/compiler/translator/BuiltInFunctionEmulator.cpp

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kc3-lang/angle /src/compiler/translator/BuiltInFunctionEmulator.cpp