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// slang-ir-dll-import.cpp
#include "slang-ir-dll-import.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
#include "slang-ir-marshal-native-call.h"
#include "slang-ir-layout.h"
namespace Slang
{
struct DllImportContext
{
IRModule* module;
DiagnosticSink* diagnosticSink;
TargetRequest* targetReq;
IRFunc* loadDllFunc = nullptr;
IRFunc* loadFuncPtrFunc = nullptr;
IRFunc* stringGetBufferFunc = nullptr;
IRFunc* createBuiltinIntrinsicFunc(UInt paramCount, IRType** paramTypes, IRType* resultType, UnownedStringSlice targetIntrinsic)
{
IRBuilder builder(module);
builder.setInsertInto(module->getModuleInst());
IRFunc* result = builder.createFunc();
builder.setInsertInto(result);
auto funcType = builder.getFuncType(paramCount, paramTypes, resultType);
builder.setDataType(result, funcType);
builder.addTargetIntrinsicDecoration(
result, CapabilitySet(CapabilityAtom::CPP), targetIntrinsic);
return result;
}
IRFunc* getLoadDllFunc()
{
if (!loadDllFunc)
{
IRBuilder builder(module);
builder.setInsertInto(module->getModuleInst());
IRType* stringType = builder.getStringType();
loadDllFunc = createBuiltinIntrinsicFunc(
1,
&stringType,
builder.getPtrType(builder.getVoidType()),
UnownedStringSlice("_slang_rt_load_dll($0)"));
}
return loadDllFunc;
}
IRFunc* getLoadFuncPtrFunc()
{
if (!loadFuncPtrFunc)
{
IRBuilder builder(module);
builder.setInsertInto(module->getModuleInst());
IRType* stringType = builder.getStringType();
IRType* uintType = builder.getUIntType();
IRType* paramTypes[] = {builder.getPtrType(builder.getVoidType()), stringType, uintType };
loadFuncPtrFunc = createBuiltinIntrinsicFunc(
3,
paramTypes,
builder.getPtrType(builder.getVoidType()),
UnownedStringSlice("_slang_rt_load_dll_func($0, $1, $2)"));
}
return loadFuncPtrFunc;
}
IRFunc* getStringGetBufferFunc()
{
if (!stringGetBufferFunc)
{
IRBuilder builder(module);
builder.setInsertInto(module->getModuleInst());
IRType* stringType = builder.getStringType();
IRType* paramTypes[] = {stringType};
stringGetBufferFunc = createBuiltinIntrinsicFunc(
1,
paramTypes,
builder.getPtrType(builder.getCharType()),
UnownedStringSlice("const_cast<char*>($0.getBuffer())"));
}
return stringGetBufferFunc;
}
uint32_t getStdCallArgumentSize(IRFunc* func)
{
uint32_t result = 0;
for (auto param : func->getParams())
{
IRSizeAndAlignment sizeAndAlignment;
getNaturalSizeAndAlignment(targetReq, param->getDataType(), &sizeAndAlignment);
result += (uint32_t)align(sizeAndAlignment.size, 4);
}
return result;
}
void processFunc(IRFunc* func, IRDllImportDecoration* dllImportDecoration)
{
assert(func->getFirstBlock() == nullptr);
IRBuilder builder(module);
NativeCallMarshallingContext marshalContext;
auto nativeType = marshalContext.getNativeFuncType(builder, func->getDataType());
builder.setInsertInto(module->getModuleInst());
auto funcPtr = builder.createGlobalVar(nativeType);
builder.setInsertInto(funcPtr);
builder.emitBlock();
builder.emitReturn(builder.getNullVoidPtrValue());
builder.setInsertInto(func);
auto block = builder.emitBlock();
builder.setInsertInto(block);
// Emit parameters.
auto declaredFuncType = func->getDataType();
List<IRParam*> params;
for (UInt i = 0; i < declaredFuncType->getParamCount(); ++i)
{
auto paramType = declaredFuncType->getParamType(i);
params.add(builder.emitParam((IRType*)paramType));
}
IRInst* cmpArgs[] = {builder.emitLoad(nativeType, funcPtr), builder.getNullVoidPtrValue() };
auto isUninitialized =
builder.emitIntrinsicInst(builder.getBoolType(), kIROp_Eql, 2, cmpArgs);
auto trueBlock = builder.emitBlock();
auto afterBlock = builder.emitBlock();
builder.setInsertInto(block);
builder.emitIf(isUninitialized, trueBlock, afterBlock);
builder.setInsertInto(trueBlock);
IRInst* modulePtr;
if (dllImportDecoration->getLibraryName() == "")
{
modulePtr = builder.getNullVoidPtrValue();
}
else
{
modulePtr = builder.emitCallInst(
builder.getPtrType(builder.getVoidType()),
getLoadDllFunc(),
builder.getStringValue(dllImportDecoration->getLibraryName()));
}
auto argumentSize = builder.getIntValue(builder.getUIntType(), getStdCallArgumentSize(func));
IRInst* loadDllFuncArgs[] = {
modulePtr, builder.getStringValue(dllImportDecoration->getFunctionName()), argumentSize};
auto loadedNativeFuncPtr = builder.emitCallInst(
builder.getPtrType(builder.getVoidType()), getLoadFuncPtrFunc(), 3, loadDllFuncArgs);
builder.emitStore(
funcPtr, builder.emitBitCast(nativeType, loadedNativeFuncPtr));
builder.emitBranch(afterBlock);
builder.setInsertInto(afterBlock);
marshalContext.diagnosticSink = diagnosticSink;
auto callResult = marshalContext.marshalNativeCall(
builder,
declaredFuncType,
nativeType,
builder.emitLoad(funcPtr),
params.getCount(),
(IRInst**)params.getBuffer());
builder.emitReturn(callResult);
}
void processModule()
{
for (auto childFunc : module->getGlobalInsts())
{
switch(childFunc->getOp())
{
case kIROp_Func:
if (auto dllImportDecoration = childFunc->findDecoration<IRDllImportDecoration>())
{
processFunc(as<IRFunc>(childFunc), dllImportDecoration);
}
break;
default:
break;
}
}
}
};
void generateDllImportFuncs(TargetRequest* targetReq, IRModule* module, DiagnosticSink* sink)
{
DllImportContext context;
context.module = module;
context.targetReq = targetReq;
context.diagnosticSink = sink;
return context.processModule();
}
}
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