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// Copyright 2024 The Dawn & Tint Authors
//
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// 1. Redistributions of source code must retain the above copyright notice, this
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#include "src/tint/lang/wgsl/writer/raise/ptr_to_ref.h"
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/function.h"
#include "src/tint/lang/core/ir/let.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/var.h"
#include "src/tint/lang/core/type/pointer.h"
#include "src/tint/lang/core/type/reference.h"
#include "src/tint/lang/wgsl/ir/unary.h"
#include "src/tint/utils/containers/reverse.h"
namespace tint::wgsl::writer::raise {
namespace {
struct Impl {
core::ir::Module& mod;
core::ir::Builder b{mod};
Result<SuccessType> Run() {
Vector<core::ir::Block*, 32> blocks;
for (auto fn : mod.functions) {
blocks.Push(fn->Block());
}
blocks.Push(mod.root_block);
while (!blocks.IsEmpty()) {
auto* block = blocks.Pop();
for (auto* inst : *block) {
tint::Switch(
inst, //
[&](core::ir::Var* var) { ResultPtrToRef(var); },
[&](core::ir::Let* let) {
OperandRefToPtr({let, core::ir::Let::kValueOperandOffset});
},
[&](core::ir::Call* call) { OperandsRefToPtr(call); },
[&](core::ir::Access* access) {
OperandPtrToRef({access, core::ir::Access::kObjectOperandOffset});
ResultPtrToRef(access);
},
[&](core::ir::Store* store) {
OperandPtrToRef({store, core::ir::Store::kToOperandOffset});
},
[&](core::ir::StoreVectorElement* store) {
OperandPtrToRef({store, core::ir::StoreVectorElement::kToOperandOffset});
},
[&](core::ir::Load* load) {
OperandPtrToRef({load, core::ir::Load::kFromOperandOffset});
},
[&](core::ir::LoadVectorElement* load) {
OperandPtrToRef({load, core::ir::LoadVectorElement::kFromOperandOffset});
},
[&](core::ir::ControlInstruction* ctrl) {
Vector<core::ir::Block*, 3> children;
ctrl->ForeachBlock([&](core::ir::Block* child) { children.Push(child); });
for (auto* child : Reverse(children)) {
blocks.Push(child);
}
});
}
}
return Success;
}
void OperandsRefToPtr(core::ir::Instruction* inst) {
for (size_t i = 0, n = inst->Operands().Length(); i < n; i++) {
OperandRefToPtr({inst, i});
}
}
void OperandRefToPtr(const core::ir::Usage& use) {
auto* operand = use.instruction->Operand(use.operand_index);
TINT_ASSERT(operand);
if (auto* ref_ty = As<core::type::Reference>(operand->Type())) {
auto* as_ptr = b.InstructionResult(RefToPtr(ref_ty));
mod.allocators.instructions
.Create<wgsl::ir::Unary>(as_ptr, core::UnaryOp::kAddressOf, operand)
->InsertBefore(use.instruction);
use.instruction->SetOperand(use.operand_index, as_ptr);
}
}
const core::type::Pointer* RefToPtr(const core::type::Reference* ref_ty) {
return mod.Types().Get<core::type::Pointer>(ref_ty->AddressSpace(), ref_ty->StoreType(),
ref_ty->Access());
}
void OperandPtrToRef(const core::ir::Usage& use) {
auto* operand = use.instruction->Operand(use.operand_index);
if (auto* ptr_ty = As<core::type::Pointer>(operand->Type())) {
auto* as_ptr = b.InstructionResult(PtrToRef(ptr_ty));
mod.allocators.instructions
.Create<wgsl::ir::Unary>(as_ptr, core::UnaryOp::kIndirection, operand)
->InsertBefore(use.instruction);
use.instruction->SetOperand(use.operand_index, as_ptr);
}
}
void ResultPtrToRef(core::ir::Instruction* inst) {
auto* result = inst->Result(0);
if (auto* ptr = result->Type()->As<core::type::Pointer>()) {
result->SetType(PtrToRef(ptr));
}
}
const core::type::Reference* PtrToRef(const core::type::Pointer* ptr_ty) {
return mod.Types().Get<core::type::Reference>(ptr_ty->AddressSpace(), ptr_ty->StoreType(),
ptr_ty->Access());
}
};
} // namespace
Result<SuccessType> PtrToRef(core::ir::Module& mod) {
return Impl{mod}.Run();
}
} // namespace tint::wgsl::writer::raise