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#include "slang-ir-insert-debug-value-store.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
#include "slang-ir-util.h"
namespace Slang
{
void insertDebugValueStore(IRFunc* func)
{
IRBuilder builder(func);
Dictionary<IRInst*, IRInst*> mapVarToDebugVar;
auto firstBlock = func->getFirstBlock();
if (!firstBlock)
return;
auto funcDebugLoc = func->findDecoration<IRDebugLocationDecoration>();
if (!funcDebugLoc)
return;
List<IRInst*> params;
for (auto param : firstBlock->getParams())
{
params.add(param);
}
Index paramIndex = 0;
for (auto param : params)
{
builder.setInsertBefore(firstBlock->getFirstOrdinaryInst());
auto paramType = param->getDataType();
bool isRefParam = false;
if (auto outType = as<IROutTypeBase>(paramType))
{
isRefParam = true;
paramType = outType->getValueType();
}
auto debugVar = builder.emitDebugVar(
paramType,
funcDebugLoc->getSource(),
funcDebugLoc->getLine(),
funcDebugLoc->getCol(),
builder.getIntValue(builder.getUIntType(), paramIndex));
copyNameHintAndDebugDecorations(debugVar, param);
mapVarToDebugVar[param] = debugVar;
// Store the initial value of the parameter into the debug var.
IRInst* paramVal = nullptr;
if (!isRefParam)
paramVal = param;
else if (as<IRInOutType>(param->getDataType()))
paramVal = builder.emitLoad(param);
if (paramVal)
{
ArrayView<IRInst*> accessChain;
builder.emitDebugValue(debugVar, paramVal, accessChain);
}
paramIndex++;
}
for (auto block : func->getBlocks())
{
IRInst* nextInst = nullptr;
for (auto inst = block->getFirstInst(); inst; inst = nextInst)
{
nextInst = inst->getNextInst();
if (auto varInst = as<IRVar>(inst))
{
if (auto debugLoc = varInst->findDecoration<IRDebugLocationDecoration>())
{
builder.setInsertBefore(varInst);
auto debugVar = builder.emitDebugVar(
tryGetPointedToType(&builder, varInst->getDataType()),
debugLoc->getSource(),
debugLoc->getLine(),
debugLoc->getCol());
copyNameHintAndDebugDecorations(debugVar, varInst);
mapVarToDebugVar[varInst] = debugVar;
}
}
}
}
// Collect all stores and insert debug value insts to update debug vars.
// Helper func to insert debugValue updates.
auto setDebugValue = [&](IRInst* debugVar, IRInst* rootVar, IRInst* newValue, ArrayView<IRInst*> accessChain)
{
// SPIRV does not allow dynamic indices in DebugValue,
// so we need to stop the access chain at the first dynamic index.
Index i = 0;
for (; i < accessChain.getCount(); i++)
{
if (auto key = as<IRStructKey>(accessChain[i]))
{
continue;
}
if (as<IRIntLit>(accessChain[i]))
{
continue;
}
break;
}
// If everything is static on the access chain, we can simply emit a DebugValue.
if (i == accessChain.getCount())
{
builder.emitDebugValue(debugVar, newValue, accessChain);
return;
}
// Otherwise we need to load the entire composite value starting at the dynamic index access chain
// and set it.
auto compositePtr = builder.emitElementAddress(rootVar, accessChain.head(i));
auto compositeVal = builder.emitLoad(compositePtr);
builder.emitDebugValue(debugVar, compositeVal, accessChain.head(i));
};
for (auto block : func->getBlocks())
{
IRInst* nextInst = nullptr;
for (auto inst = block->getFirstInst(); inst; inst = nextInst)
{
nextInst = inst->getNextInst();
if (auto storeInst = as<IRStore>(inst))
{
List<IRInst*> accessChain;
auto varInst = getRootAddr(storeInst->getPtr(), accessChain);
IRInst* debugVar = nullptr;
if (mapVarToDebugVar.tryGetValue(varInst, debugVar))
{
builder.setInsertAfter(storeInst);
setDebugValue(debugVar, varInst, storeInst->getVal(), accessChain.getArrayView());
}
}
else if (auto swizzledStore = as<IRSwizzledStore>(inst))
{
List<IRInst*> accessChain;
auto varInst = getRootAddr(swizzledStore->getDest(), accessChain);
IRInst* debugVar = nullptr;
if (mapVarToDebugVar.tryGetValue(varInst, debugVar))
{
builder.setInsertAfter(swizzledStore);
auto loadVal = builder.emitLoad(swizzledStore->getDest());
setDebugValue(debugVar, varInst, loadVal, accessChain.getArrayView());
}
}
else if (auto callInst = as<IRCall>(inst))
{
auto funcValue = getResolvedInstForDecorations(callInst->getCallee());
if (!funcValue)
continue;
for (UInt i = 0; i < callInst->getArgCount(); i++)
{
auto arg = callInst->getArg(i);
if (!as<IRPtrTypeBase>(arg->getDataType()))
continue;
List<IRInst*> accessChain;
auto varInst = getRootAddr(arg, accessChain);
IRInst* debugVar = nullptr;
if (mapVarToDebugVar.tryGetValue(varInst, debugVar))
{
builder.setInsertAfter(callInst);
auto loadVal = builder.emitLoad(arg);
setDebugValue(debugVar, varInst, loadVal, accessChain.getArrayView());
}
}
}
}
}
}
void insertDebugValueStore(IRModule* module)
{
for (auto globalInst : module->getGlobalInsts())
{
if (auto genericInst = as<IRGeneric>(globalInst))
{
if (auto func = as<IRFunc>(findGenericReturnVal(genericInst)))
{
insertDebugValueStore(func);
}
}
else if (auto func = as<IRFunc>(globalInst))
{
insertDebugValueStore(func);
}
}
}
}
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