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// slang-ir-lower-com-methods.cpp
#include "slang-ir-lower-com-methods.h"
#include "slang-ir-inst-pass-base.h"
#include "slang-ir-insts.h"
#include "slang-ir-marshal-native-call.h"
#include "slang-ir-util.h"
#include "slang-ir.h"
namespace Slang
{
struct ComMethodLoweringContext : public InstPassBase
{
DiagnosticSink* diagnosticSink = nullptr;
NativeCallMarshallingContext marshal;
OrderedHashSet<IRLookupWitnessMethod*> comCallees;
ComMethodLoweringContext(IRModule* inModule)
: InstPassBase(inModule)
{
}
void processComCall(IRCall* comCall)
{
IRBuilder builder(module);
builder.setInsertBefore(comCall);
auto callee = as<IRLookupWitnessMethod>(comCall->getCallee());
SLANG_ASSERT(callee);
IRLookupWitnessMethod* innerMostCallee = callee;
while (innerMostCallee->getOperand(0)->getOp() == kIROp_LookupWitnessMethod)
{
innerMostCallee = as<IRLookupWitnessMethod>(innerMostCallee->getOperand(0));
}
if (callee != innerMostCallee)
{
callee = (IRLookupWitnessMethod*)builder.emitLookupInterfaceMethodInst(
callee->getDataType(),
innerMostCallee->getWitnessTable(),
callee->getRequirementKey());
}
comCallees.add(callee);
auto calleeType = as<IRFuncType>(callee->getDataType());
SLANG_ASSERT(calleeType);
auto nativeFuncType = marshal.getNativeFuncType(builder, calleeType);
ShortList<IRInst*> args;
for (UInt i = 0; i < comCall->getArgCount(); i++)
args.add(comCall->getArg(i));
auto currentBlock = builder.getBlock();
auto nextInst = comCall->getNextInst();
auto newResult = marshal.marshalNativeCall(
builder,
calleeType,
nativeFuncType,
callee,
args.getCount(),
args.getArrayView().getBuffer());
comCall->replaceUsesWith(newResult);
if (builder.getBlock() != currentBlock)
{
// `marshalNativeCall` may have replaced the original call with branch insts.
// If this is the case, we need to move all insts after the original call in the
// original basic block to the new basic block.
while (nextInst)
{
auto next = nextInst->getNextInst();
nextInst->removeFromParent();
nextInst->insertAtEnd(builder.getBlock());
nextInst = next;
}
}
comCall->removeAndDeallocate();
}
void processCall(IRCall* inst)
{
auto funcValue = inst->getOperand(0);
// Detect if this is a call into a COM interface method.
if (funcValue->getOp() == kIROp_LookupWitnessMethod)
{
const auto operand0TypeOp = funcValue->getOperand(0)->getDataType();
if (auto tableType = as<IRWitnessTableTypeBase>(operand0TypeOp))
{
if (tableType->getConformanceType()->findDecoration<IRComInterfaceDecoration>())
{
processComCall(inst);
return;
}
}
}
}
void processInterfaceType(IRInterfaceType* interfaceType)
{
if (!interfaceType->findDecoration<IRComInterfaceDecoration>())
return;
IRBuilder builder(module);
for (UInt i = 0; i < interfaceType->getOperandCount(); i++)
{
auto entry = as<IRInterfaceRequirementEntry>(interfaceType->getOperand(i));
if (!entry)
continue;
if (auto funcType = as<IRFuncType>(entry->getRequirementVal()))
{
builder.setInsertBefore(funcType);
entry->setRequirementVal(marshal.getNativeFuncType(builder, funcType));
}
}
}
void processWitnessTable(IRWitnessTable* witnessTable)
{
auto interfaceType = as<IRInterfaceType>(witnessTable->getConformanceType());
if (!interfaceType)
return;
if (!interfaceType->findDecoration<IRComInterfaceDecoration>())
return;
auto interfaceReqDict = buildInterfaceRequirementDict(interfaceType);
IRBuilder builder(module);
NativeCallMarshallingContext marshalContext;
marshalContext.diagnosticSink = diagnosticSink;
for (auto entry : witnessTable->getEntries())
{
IRInst* interfaceRequirement = nullptr;
if (!interfaceReqDict.tryGetValue(entry->getRequirementKey(), interfaceRequirement))
continue;
auto implFunc = as<IRFunc>(entry->getSatisfyingVal());
if (!implFunc)
continue;
// If the function already has the same signature as the lowered COM interface method,
// we don't need to do anything.
if (isTypeEqual(
entry->getSatisfyingVal()->getDataType(),
(IRType*)interfaceRequirement))
continue;
// Now we need to generate a wrapper function that calls into the original one.
auto nativeFunc = marshalContext.generateDLLExportWrapperFunc(builder, implFunc);
entry->setOperand(1, nativeFunc);
}
auto classType = witnessTable->getConcreteType();
builder.addCOMWitnessDecoration(classType, witnessTable);
}
void processModule()
{
// Translate all Calls to interface methods.
processInstsOfType<IRCall>(kIROp_Call, [this](IRCall* inst) { processCall(inst); });
// Update functypes of com callees.
for (auto callee : comCallees)
{
IRBuilder builder(module);
builder.setInsertBefore(callee);
auto nativeType =
marshal.getNativeFuncType(builder, as<IRFuncType>(callee->getDataType()));
callee->setFullType(nativeType);
}
// Update func types of COM interfaces.
processInstsOfType<IRInterfaceType>(
kIROp_InterfaceType,
[this](IRInterfaceType* inst) { processInterfaceType(inst); });
// Update witness tables of classes that implement COM interfaces.
// Generate native-to-managed wrappers for each witness table entry.
processInstsOfType<IRWitnessTable>(
kIROp_WitnessTable,
[this](IRWitnessTable* table) { processWitnessTable(table); });
}
};
void lowerComMethods(IRModule* module, DiagnosticSink* sink)
{
ComMethodLoweringContext context(module);
context.diagnosticSink = sink;
context.marshal.diagnosticSink = sink;
return context.processModule();
}
} // namespace Slang
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