bgfx/3rdparty/spirv-tools/source/opt/inst_bindless_check_pass.cpp

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// Copyright (c) 2018 The Khronos Group Inc.
// Copyright (c) 2018 Valve Corporation
// Copyright (c) 2018 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 "inst_bindless_check_pass.h"
namespace {
// Input Operand Indices
static const int kSpvImageSampleImageIdInIdx = 0;
static const int kSpvSampledImageImageIdInIdx = 0;
static const int kSpvSampledImageSamplerIdInIdx = 1;
static const int kSpvImageSampledImageIdInIdx = 0;
static const int kSpvLoadPtrIdInIdx = 0;
static const int kSpvAccessChainBaseIdInIdx = 0;
static const int kSpvAccessChainIndex0IdInIdx = 1;
static const int kSpvTypePointerTypeIdInIdx = 1;
static const int kSpvTypeArrayLengthIdInIdx = 1;
static const int kSpvConstantValueInIdx = 0;
} // anonymous namespace
namespace spvtools {
namespace opt {
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uint32_t InstBindlessCheckPass::GenDebugReadLength(
uint32_t image_id, InstructionBuilder* builder) {
uint32_t desc_set_idx =
var2desc_set_[image_id] + kDebugInputBindlessOffsetLengths;
uint32_t desc_set_idx_id = builder->GetUintConstantId(desc_set_idx);
uint32_t desc_set_offset_id = GenDebugDirectRead(desc_set_idx_id, builder);
Instruction* binding_idx_inst =
builder->AddBinaryOp(GetUintId(), SpvOpIAdd, desc_set_offset_id,
builder->GetUintConstantId(var2binding_[image_id]));
return GenDebugDirectRead(binding_idx_inst->result_id(), builder);
}
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void InstBindlessCheckPass::GenBindlessCheckCode(
BasicBlock::iterator ref_inst_itr,
UptrVectorIterator<BasicBlock> ref_block_itr, uint32_t instruction_idx,
uint32_t stage_idx, std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
// Look for reference through bindless descriptor. If not, return.
std::unique_ptr<BasicBlock> new_blk_ptr;
uint32_t image_id;
switch (ref_inst_itr->opcode()) {
case SpvOp::SpvOpImageSampleImplicitLod:
case SpvOp::SpvOpImageSampleExplicitLod:
case SpvOp::SpvOpImageSampleDrefImplicitLod:
case SpvOp::SpvOpImageSampleDrefExplicitLod:
case SpvOp::SpvOpImageSampleProjImplicitLod:
case SpvOp::SpvOpImageSampleProjExplicitLod:
case SpvOp::SpvOpImageSampleProjDrefImplicitLod:
case SpvOp::SpvOpImageSampleProjDrefExplicitLod:
case SpvOp::SpvOpImageGather:
case SpvOp::SpvOpImageDrefGather:
case SpvOp::SpvOpImageQueryLod:
case SpvOp::SpvOpImageSparseSampleImplicitLod:
case SpvOp::SpvOpImageSparseSampleExplicitLod:
case SpvOp::SpvOpImageSparseSampleDrefImplicitLod:
case SpvOp::SpvOpImageSparseSampleDrefExplicitLod:
case SpvOp::SpvOpImageSparseSampleProjImplicitLod:
case SpvOp::SpvOpImageSparseSampleProjExplicitLod:
case SpvOp::SpvOpImageSparseSampleProjDrefImplicitLod:
case SpvOp::SpvOpImageSparseSampleProjDrefExplicitLod:
case SpvOp::SpvOpImageSparseGather:
case SpvOp::SpvOpImageSparseDrefGather:
case SpvOp::SpvOpImageFetch:
case SpvOp::SpvOpImageRead:
case SpvOp::SpvOpImageQueryFormat:
case SpvOp::SpvOpImageQueryOrder:
case SpvOp::SpvOpImageQuerySizeLod:
case SpvOp::SpvOpImageQuerySize:
case SpvOp::SpvOpImageQueryLevels:
case SpvOp::SpvOpImageQuerySamples:
case SpvOp::SpvOpImageSparseFetch:
case SpvOp::SpvOpImageSparseRead:
case SpvOp::SpvOpImageWrite:
image_id =
ref_inst_itr->GetSingleWordInOperand(kSpvImageSampleImageIdInIdx);
break;
default:
return;
}
Instruction* image_inst = get_def_use_mgr()->GetDef(image_id);
uint32_t load_id;
Instruction* load_inst;
if (image_inst->opcode() == SpvOp::SpvOpSampledImage) {
load_id = image_inst->GetSingleWordInOperand(kSpvSampledImageImageIdInIdx);
load_inst = get_def_use_mgr()->GetDef(load_id);
} else if (image_inst->opcode() == SpvOp::SpvOpImage) {
load_id = image_inst->GetSingleWordInOperand(kSpvImageSampledImageIdInIdx);
load_inst = get_def_use_mgr()->GetDef(load_id);
} else {
load_id = image_id;
load_inst = image_inst;
image_id = 0;
}
if (load_inst->opcode() != SpvOp::SpvOpLoad) {
// TODO(greg-lunarg): Handle additional possibilities
return;
}
uint32_t ptr_id = load_inst->GetSingleWordInOperand(kSpvLoadPtrIdInIdx);
Instruction* ptr_inst = get_def_use_mgr()->GetDef(ptr_id);
if (ptr_inst->opcode() != SpvOp::SpvOpAccessChain) return;
if (ptr_inst->NumInOperands() != 2) {
assert(false && "unexpected bindless index number");
return;
}
uint32_t index_id =
ptr_inst->GetSingleWordInOperand(kSpvAccessChainIndex0IdInIdx);
ptr_id = ptr_inst->GetSingleWordInOperand(kSpvAccessChainBaseIdInIdx);
ptr_inst = get_def_use_mgr()->GetDef(ptr_id);
if (ptr_inst->opcode() != SpvOpVariable) {
assert(false && "unexpected bindless base");
return;
}
uint32_t var_type_id = ptr_inst->type_id();
Instruction* var_type_inst = get_def_use_mgr()->GetDef(var_type_id);
uint32_t ptr_type_id =
var_type_inst->GetSingleWordInOperand(kSpvTypePointerTypeIdInIdx);
Instruction* ptr_type_inst = get_def_use_mgr()->GetDef(ptr_type_id);
// If index and bound both compile-time constants and index < bound,
// return without changing
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uint32_t length_id = 0;
if (ptr_type_inst->opcode() == SpvOpTypeArray) {
length_id =
ptr_type_inst->GetSingleWordInOperand(kSpvTypeArrayLengthIdInIdx);
Instruction* index_inst = get_def_use_mgr()->GetDef(index_id);
Instruction* length_inst = get_def_use_mgr()->GetDef(length_id);
if (index_inst->opcode() == SpvOpConstant &&
length_inst->opcode() == SpvOpConstant &&
index_inst->GetSingleWordInOperand(kSpvConstantValueInIdx) <
length_inst->GetSingleWordInOperand(kSpvConstantValueInIdx))
return;
} else if (!runtime_array_enabled_ ||
ptr_type_inst->opcode() != SpvOpTypeRuntimeArray) {
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return;
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}
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// Generate full runtime bounds test code with true branch
// being full reference and false branch being debug output and zero
// for the referenced value.
MovePreludeCode(ref_inst_itr, ref_block_itr, &new_blk_ptr);
InstructionBuilder builder(
context(), &*new_blk_ptr,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
uint32_t error_id = builder.GetUintConstantId(kInstErrorBindlessBounds);
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// If length id not yet set, descriptor array is runtime size so
// generate load of length from stage's debug input buffer.
if (length_id == 0) {
assert(ptr_type_inst->opcode() == SpvOpTypeRuntimeArray &&
"unexpected bindless type");
length_id = GenDebugReadLength(image_id, &builder);
}
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Instruction* ult_inst =
builder.AddBinaryOp(GetBoolId(), SpvOpULessThan, index_id, length_id);
uint32_t merge_blk_id = TakeNextId();
uint32_t valid_blk_id = TakeNextId();
uint32_t invalid_blk_id = TakeNextId();
std::unique_ptr<Instruction> merge_label(NewLabel(merge_blk_id));
std::unique_ptr<Instruction> valid_label(NewLabel(valid_blk_id));
std::unique_ptr<Instruction> invalid_label(NewLabel(invalid_blk_id));
(void)builder.AddConditionalBranch(ult_inst->result_id(), valid_blk_id,
invalid_blk_id, merge_blk_id,
SpvSelectionControlMaskNone);
// Close selection block and gen valid reference block
new_blocks->push_back(std::move(new_blk_ptr));
new_blk_ptr.reset(new BasicBlock(std::move(valid_label)));
builder.SetInsertPoint(&*new_blk_ptr);
// Clone descriptor load
Instruction* new_load_inst =
builder.AddLoad(load_inst->type_id(),
load_inst->GetSingleWordInOperand(kSpvLoadPtrIdInIdx));
uint32_t new_load_id = new_load_inst->result_id();
get_decoration_mgr()->CloneDecorations(load_inst->result_id(), new_load_id);
uint32_t new_image_id = new_load_id;
// Clone Image/SampledImage with new load, if needed
if (image_id != 0) {
if (image_inst->opcode() == SpvOp::SpvOpSampledImage) {
Instruction* new_image_inst = builder.AddBinaryOp(
image_inst->type_id(), SpvOpSampledImage, new_load_id,
image_inst->GetSingleWordInOperand(kSpvSampledImageSamplerIdInIdx));
new_image_id = new_image_inst->result_id();
} else {
assert(image_inst->opcode() == SpvOp::SpvOpImage && "expecting OpImage");
Instruction* new_image_inst =
builder.AddUnaryOp(image_inst->type_id(), SpvOpImage, new_load_id);
new_image_id = new_image_inst->result_id();
}
get_decoration_mgr()->CloneDecorations(image_id, new_image_id);
}
// Clone original reference using new image code
std::unique_ptr<Instruction> new_ref_inst(ref_inst_itr->Clone(context()));
uint32_t ref_result_id = ref_inst_itr->result_id();
uint32_t new_ref_id = 0;
if (ref_result_id != 0) {
new_ref_id = TakeNextId();
new_ref_inst->SetResultId(new_ref_id);
}
new_ref_inst->SetInOperand(kSpvImageSampleImageIdInIdx, {new_image_id});
// Register new reference and add to new block
builder.AddInstruction(std::move(new_ref_inst));
if (new_ref_id != 0)
get_decoration_mgr()->CloneDecorations(ref_result_id, new_ref_id);
// Close valid block and gen invalid block
(void)builder.AddBranch(merge_blk_id);
new_blocks->push_back(std::move(new_blk_ptr));
new_blk_ptr.reset(new BasicBlock(std::move(invalid_label)));
builder.SetInsertPoint(&*new_blk_ptr);
uint32_t u_index_id = GenUintCastCode(index_id, &builder);
GenDebugStreamWrite(instruction_idx, stage_idx,
{error_id, u_index_id, length_id}, &builder);
// Remember last invalid block id
uint32_t last_invalid_blk_id = new_blk_ptr->GetLabelInst()->result_id();
// Gen zero for invalid reference
uint32_t ref_type_id = ref_inst_itr->type_id();
// Close invalid block and gen merge block
(void)builder.AddBranch(merge_blk_id);
new_blocks->push_back(std::move(new_blk_ptr));
new_blk_ptr.reset(new BasicBlock(std::move(merge_label)));
builder.SetInsertPoint(&*new_blk_ptr);
// Gen phi of new reference and zero, if necessary, and replace the
// result id of the original reference with that of the Phi. Kill original
// reference and move in remainder of original block.
if (new_ref_id != 0) {
Instruction* phi_inst = builder.AddPhi(
ref_type_id, {new_ref_id, valid_blk_id, builder.GetNullId(ref_type_id),
last_invalid_blk_id});
context()->ReplaceAllUsesWith(ref_result_id, phi_inst->result_id());
}
context()->KillInst(&*ref_inst_itr);
MovePostludeCode(ref_block_itr, &new_blk_ptr);
// Add remainder/merge block to new blocks
new_blocks->push_back(std::move(new_blk_ptr));
}
void InstBindlessCheckPass::InitializeInstBindlessCheck() {
// Initialize base class
InitializeInstrument();
// Look for related extensions
ext_descriptor_indexing_defined_ = false;
for (auto& ei : get_module()->extensions()) {
const char* ext_name =
reinterpret_cast<const char*>(&ei.GetInOperand(0).words[0]);
if (strcmp(ext_name, "SPV_EXT_descriptor_indexing") == 0) {
ext_descriptor_indexing_defined_ = true;
break;
}
}
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// If descriptor indexing extension and runtime array support enabled,
// create variable to descriptor set mapping.
if (ext_descriptor_indexing_defined_ && runtime_array_enabled_)
for (auto& anno : get_module()->annotations())
if (anno.opcode() == SpvOpDecorate) {
if (anno.GetSingleWordInOperand(1u) == SpvDecorationDescriptorSet)
var2desc_set_[anno.GetSingleWordInOperand(0u)] =
anno.GetSingleWordInOperand(2u);
else if (anno.GetSingleWordInOperand(1u) == SpvDecorationBinding)
var2binding_[anno.GetSingleWordInOperand(0u)] =
anno.GetSingleWordInOperand(2u);
}
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}
Pass::Status InstBindlessCheckPass::ProcessImpl() {
// Perform instrumentation on each entry point function in module
InstProcessFunction pfn =
[this](BasicBlock::iterator ref_inst_itr,
UptrVectorIterator<BasicBlock> ref_block_itr,
uint32_t instruction_idx, uint32_t stage_idx,
std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
return GenBindlessCheckCode(ref_inst_itr, ref_block_itr,
instruction_idx, stage_idx, new_blocks);
};
bool modified = InstProcessEntryPointCallTree(pfn);
// This pass does not update inst->blk info
context()->InvalidateAnalyses(IRContext::kAnalysisInstrToBlockMapping);
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
}
Pass::Status InstBindlessCheckPass::Process() {
InitializeInstBindlessCheck();
return ProcessImpl();
}
} // namespace opt
} // namespace spvtools