SPIRV-Tools/source/opt/inline_opaque_pass.cpp
GregF 429ca05b3f Opt: Create InlineOpaquePass
Only inline calls to functions with opaque params or return

TODO: Handle parameter type or return type where the opqaue
type is buried within an array.
2017-08-18 18:04:30 -04:00

123 lines
3.8 KiB
C++

// Copyright (c) 2017 The Khronos Group Inc.
// Copyright (c) 2017 Valve Corporation
// Copyright (c) 2017 LunarG Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "inline_opaque_pass.h"
namespace spvtools {
namespace opt {
namespace {
const uint32_t kTypePointerTypeIdInIdx = 1;
} // anonymous namespace
bool InlineOpaquePass::IsOpaqueType(uint32_t typeId) {
const ir::Instruction* typeInst = def_use_mgr_->GetDef(typeId);
switch (typeInst->opcode()) {
case SpvOpTypeSampler:
case SpvOpTypeImage:
case SpvOpTypeSampledImage:
return true;
case SpvOpTypePointer:
return IsOpaqueType(typeInst->GetSingleWordInOperand(
kTypePointerTypeIdInIdx));
default:
break;
}
// TODO(greg-lunarg): Handle arrays containing opaque type
if (typeInst->opcode() != SpvOpTypeStruct)
return false;
// Return true if any member is opaque
int ocnt = 0;
typeInst->ForEachInId([&ocnt,this](const uint32_t* tid) {
if (ocnt == 0 && IsOpaqueType(*tid)) ++ocnt;
});
return ocnt > 0;
}
bool InlineOpaquePass::HasOpaqueArgsOrReturn(const ir::Instruction* callInst) {
// Check return type
if (IsOpaqueType(callInst->type_id()))
return true;
// Check args
int icnt = 0;
int ocnt = 0;
callInst->ForEachInId([&icnt,&ocnt,this](const uint32_t *iid) {
if (icnt > 0) {
const ir::Instruction* argInst = def_use_mgr_->GetDef(*iid);
if (IsOpaqueType(argInst->type_id()))
++ocnt;
}
++icnt;
});
return ocnt > 0;
}
bool InlineOpaquePass::InlineOpaque(ir::Function* func) {
bool modified = false;
// Using block iterators here because of block erasures and insertions.
for (auto bi = func->begin(); bi != func->end(); ++bi) {
for (auto ii = bi->begin(); ii != bi->end();) {
if (IsInlinableFunctionCall(&*ii) && HasOpaqueArgsOrReturn(&*ii)) {
// Inline call.
std::vector<std::unique_ptr<ir::BasicBlock>> newBlocks;
std::vector<std::unique_ptr<ir::Instruction>> newVars;
GenInlineCode(&newBlocks, &newVars, ii, bi);
// If call block is replaced with more than one block, point
// succeeding phis at new last block.
if (newBlocks.size() > 1)
UpdateSucceedingPhis(newBlocks);
// Replace old calling block with new block(s).
bi = bi.Erase();
bi = bi.InsertBefore(&newBlocks);
// Insert new function variables.
if (newVars.size() > 0) func->begin()->begin().InsertBefore(&newVars);
// Restart inlining at beginning of calling block.
ii = bi->begin();
modified = true;
} else {
++ii;
}
}
}
return modified;
}
void InlineOpaquePass::Initialize(ir::Module* module) {
InitializeInline(module);
};
Pass::Status InlineOpaquePass::ProcessImpl() {
// Do opaque inlining on each function in entry point call tree
ProcessFunction pfn = [this](ir::Function* fp) {
return InlineOpaque(fp);
};
bool modified = ProcessEntryPointCallTree(pfn, module_);
FinalizeNextId(module_);
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
}
InlineOpaquePass::InlineOpaquePass() {}
Pass::Status InlineOpaquePass::Process(ir::Module* module) {
Initialize(module);
return ProcessImpl();
}
} // namespace opt
} // namespace spvtools