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// slang-ir-lower-generics.cpp
#include "slang-ir-lower-generics.h"
#include "slang-ir.h"
#include "slang-ir-clone.h"
#include "slang-ir-insts.h"
namespace Slang
{
struct GenericsLoweringContext;
struct GenericsLoweringContext
{
// For convenience, we will keep a pointer to the module
// we are processing.
IRModule* module;
Dictionary<IRInst*, IRInst*> loweredGenericFunctions;
SharedIRBuilder sharedBuilderStorage;
// We will use a single work list of instructions that need
// to be considered for lowering.
//
List<IRInst*> workList;
HashSet<IRInst*> workListSet;
void addToWorkList(
IRInst* inst)
{
// We will ignore any code that is nested under a generic,
// because they will be recursively processed through specialized
// call sites.
//
for (auto ii = inst->getParent(); ii; ii = ii->getParent())
{
if (as<IRGeneric>(ii))
return;
}
if (workListSet.Contains(inst))
return;
workList.add(inst);
workListSet.Add(inst);
}
IRInst* lowerGenericFunction(IRInst* genericValue)
{
IRInst* result = nullptr;
if (loweredGenericFunctions.TryGetValue(genericValue, result))
return result;
auto genericParent = as<IRGeneric>(genericValue);
SLANG_ASSERT(genericParent);
auto func = as<IRFunc>(findGenericReturnVal(genericParent));
SLANG_ASSERT(func);
if (!func->isDefinition())
{
loweredGenericFunctions[genericValue] = genericValue;
return genericValue;
}
IRCloneEnv cloneEnv;
IRBuilder builder;
builder.sharedBuilder = &sharedBuilderStorage;
builder.setInsertBefore(genericParent);
auto loweredFunc = cloneInstAndOperands(&cloneEnv, &builder, func);
List<IRInst*> clonedParams;
for (auto genericParam : genericParent->getParams())
{
auto clonedParam = cloneInst(&cloneEnv, &builder, genericParam);
cloneEnv.mapOldValToNew[genericParam] = clonedParam;
clonedParams.add(clonedParam);
}
cloneInstDecorationsAndChildren(&cloneEnv, &sharedBuilderStorage, func, loweredFunc);
auto block = as<IRBlock>(loweredFunc->getFirstChild());
for (auto param : clonedParams)
{
param->removeFromParent();
block->addParam(as<IRParam>(param));
}
loweredGenericFunctions[genericValue] = loweredFunc;
// Turn generic parameters into void pointers.
for (auto param : cast<IRFunc>(loweredFunc)->getParams())
{
if (param->findDecoration<IRPolymorphicDecoration>())
{
param->setFullType(builder.getPtrType(builder.getVoidType()));
}
}
addToWorkList(loweredFunc);
return loweredFunc;
}
void processInst(IRInst* inst)
{
if (auto callInst = as<IRCall>(inst))
{
// If we see a call(specialize(gFunc, Targs), args),
// translate it into call(gFunc, args, Targs).
auto funcOperand = callInst->getOperand(0);
if (auto specializeInst = as<IRSpecialize>(funcOperand))
{
auto loweredFunc = lowerGenericFunction(specializeInst->getOperand(0));
if (loweredFunc == specializeInst->getOperand(0))
{
// This is an intrinsic function, don't transform.
return;
}
IRBuilder builderStorage;
auto builder = &builderStorage;
builder->sharedBuilder = &sharedBuilderStorage;
builder->setInsertBefore(inst);
List<IRInst*> args;
auto pp = as<IRFunc>(loweredFunc)->getParams().begin();
auto voidPtrType = builder->getPtrType(builder->getVoidType());
for (UInt i = 0; i < callInst->getArgCount(); i++)
{
auto arg = callInst->getArg(i);
if ((*pp)->getDataType() == voidPtrType &&
arg->getDataType() != voidPtrType)
{
// We are calling a generic function that with an argument of
// concrete type. We need to convert this argument o void*.
// Ideally this should just be a GetElementAddress inst.
// However the current code emitting logic for this instruction
// doesn't truly respect the pointerness and does not produce
// what we needed. For now we use another instruction here
// to keep changes minimal.
arg = builder->emitGetAddress(
voidPtrType,
arg);
}
args.add(arg);
++pp;
}
for (UInt i = 0; i < specializeInst->getArgCount(); i++)
args.add(specializeInst->getArg(i));
auto newCall = builder->emitCallInst(callInst->getFullType(), loweredFunc, args);
callInst->replaceUsesWith(newCall);
callInst->removeAndDeallocate();
}
}
}
void processModule()
{
// We start by initializing our shared IR building state,
// since we will re-use that state for any code we
// generate along the way.
//
SharedIRBuilder* sharedBuilder = &sharedBuilderStorage;
sharedBuilder->module = module;
sharedBuilder->session = module->session;
addToWorkList(module->getModuleInst());
while (workList.getCount() != 0)
{
// We will then iterate until our work list goes dry.
//
while (workList.getCount() != 0)
{
IRInst* inst = workList.getLast();
workList.removeLast();
workListSet.Remove(inst);
processInst(inst);
for (auto child = inst->getLastChild(); child; child = child->getPrevInst())
{
addToWorkList(child);
}
}
}
}
};
void lowerGenerics(
IRModule* module)
{
GenericsLoweringContext context;
context.module = module;
context.processModule();
}
} // namespace Slang
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