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// slang-ir-lower-com-methods.cpp
#include "slang-ir-lower-com-methods.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
#include "slang-ir-marshal-native-call.h"
#include "slang-ir-inst-pass-base.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(&sharedBuilderStorage);
builder.setInsertBefore(comCall);
auto callee = as<IRLookupWitnessMethod>(comCall->getCallee());
SLANG_ASSERT(callee);
comCallees.Add(callee);
auto calleeType = as<IRFuncType>(comCall->getCallee()->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,
comCall->getCallee(),
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_lookup_interface_method)
{
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(&sharedBuilderStorage);
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 processModule()
{
sharedBuilderStorage.init(module);
// Deduplicate equivalent types.
sharedBuilderStorage.deduplicateAndRebuildGlobalNumberingMap();
// 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(&sharedBuilderStorage);
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); });
}
};
void lowerComMethods(IRModule* module, DiagnosticSink* sink)
{
ComMethodLoweringContext context(module);
context.diagnosticSink = sink;
context.marshal.diagnosticSink = sink;
return context.processModule();
}
}
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