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(
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uint32_t var_id, InstructionBuilder* builder) {
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uint32_t desc_set_idx =
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var2desc_set_[var_id] + kDebugInputBindlessOffsetLengths;
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uint32_t desc_set_idx_id = builder->GetUintConstantId(desc_set_idx);
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uint32_t binding_idx_id = builder->GetUintConstantId(var2binding_[var_id]);
return GenDebugDirectRead({desc_set_idx_id, binding_idx_id}, builder);
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}
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uint32_t InstBindlessCheckPass::GenDebugReadInit(uint32_t var_id,
uint32_t desc_idx_id,
InstructionBuilder* builder) {
uint32_t desc_set_base_id =
builder->GetUintConstantId(kDebugInputBindlessInitOffset);
uint32_t desc_set_idx_id = builder->GetUintConstantId(var2desc_set_[var_id]);
uint32_t binding_idx_id = builder->GetUintConstantId(var2binding_[var_id]);
uint32_t u_desc_idx_id = GenUintCastCode(desc_idx_id, builder);
return GenDebugDirectRead(
{desc_set_base_id, desc_set_idx_id, binding_idx_id, u_desc_idx_id},
builder);
}
uint32_t InstBindlessCheckPass::CloneOriginalReference(
ref_analysis* ref, InstructionBuilder* builder) {
// Clone descriptor load
Instruction* load_inst = get_def_use_mgr()->GetDef(ref->load_id);
Instruction* new_load_inst =
builder->AddLoad(load_inst->type_id(),
load_inst->GetSingleWordInOperand(kSpvLoadPtrIdInIdx));
uid2offset_[new_load_inst->unique_id()] = uid2offset_[load_inst->unique_id()];
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 (ref->image_id != 0) {
Instruction* image_inst = get_def_use_mgr()->GetDef(ref->image_id);
if (image_inst->opcode() == SpvOp::SpvOpSampledImage) {
Instruction* new_image_inst = builder->AddBinaryOp(
image_inst->type_id(), SpvOpSampledImage, new_load_id,
image_inst->GetSingleWordInOperand(kSpvSampledImageSamplerIdInIdx));
uid2offset_[new_image_inst->unique_id()] =
uid2offset_[image_inst->unique_id()];
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);
uid2offset_[new_image_inst->unique_id()] =
uid2offset_[image_inst->unique_id()];
new_image_id = new_image_inst->result_id();
}
get_decoration_mgr()->CloneDecorations(ref->image_id, new_image_id);
}
// Clone original reference using new image code
std::unique_ptr<Instruction> new_ref_inst(ref->ref_inst->Clone(context()));
uint32_t ref_result_id = ref->ref_inst->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
Instruction* added_inst = builder->AddInstruction(std::move(new_ref_inst));
uid2offset_[added_inst->unique_id()] =
uid2offset_[ref->ref_inst->unique_id()];
if (new_ref_id != 0)
get_decoration_mgr()->CloneDecorations(ref_result_id, new_ref_id);
return new_ref_id;
}
uint32_t InstBindlessCheckPass::GetDescriptorValueId(Instruction* inst) {
switch (inst->opcode()) {
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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:
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return inst->GetSingleWordInOperand(kSpvImageSampleImageIdInIdx);
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default:
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break;
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}
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return 0;
}
bool InstBindlessCheckPass::AnalyzeDescriptorReference(Instruction* ref_inst,
ref_analysis* ref) {
ref->image_id = GetDescriptorValueId(ref_inst);
if (ref->image_id == 0) return false;
Instruction* image_inst = get_def_use_mgr()->GetDef(ref->image_id);
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if (image_inst->opcode() == SpvOp::SpvOpSampledImage) {
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ref->load_id =
image_inst->GetSingleWordInOperand(kSpvSampledImageImageIdInIdx);
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} else if (image_inst->opcode() == SpvOp::SpvOpImage) {
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ref->load_id =
image_inst->GetSingleWordInOperand(kSpvImageSampledImageIdInIdx);
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} else {
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ref->load_id = ref->image_id;
ref->image_id = 0;
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}
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Instruction* load_inst = get_def_use_mgr()->GetDef(ref->load_id);
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if (load_inst->opcode() != SpvOp::SpvOpLoad) {
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// TODO(greg-lunarg): Handle additional possibilities?
return false;
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}
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ref->ptr_id = load_inst->GetSingleWordInOperand(kSpvLoadPtrIdInIdx);
Instruction* ptr_inst = get_def_use_mgr()->GetDef(ref->ptr_id);
if (ptr_inst->opcode() == SpvOp::SpvOpVariable) {
ref->index_id = 0;
ref->var_id = ref->ptr_id;
} else if (ptr_inst->opcode() == SpvOp::SpvOpAccessChain) {
if (ptr_inst->NumInOperands() != 2) {
assert(false && "unexpected bindless index number");
return false;
}
ref->index_id =
ptr_inst->GetSingleWordInOperand(kSpvAccessChainIndex0IdInIdx);
ref->var_id = ptr_inst->GetSingleWordInOperand(kSpvAccessChainBaseIdInIdx);
Instruction* var_inst = get_def_use_mgr()->GetDef(ref->var_id);
if (var_inst->opcode() != SpvOpVariable) {
assert(false && "unexpected bindless base");
return false;
}
} else {
// TODO(greg-lunarg): Handle additional possibilities?
return false;
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}
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ref->ref_inst = ref_inst;
return true;
}
void InstBindlessCheckPass::GenCheckCode(
uint32_t check_id, uint32_t error_id, uint32_t length_id,
uint32_t stage_idx, ref_analysis* ref,
std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
BasicBlock* back_blk_ptr = &*new_blocks->back();
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InstructionBuilder builder(
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context(), back_blk_ptr,
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IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
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// Gen conditional branch on check_id. Valid branch generates original
// reference. Invalid generates debug output and zero result (if needed).
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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));
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(void)builder.AddConditionalBranch(check_id, valid_blk_id, invalid_blk_id,
merge_blk_id, SpvSelectionControlMaskNone);
// Gen valid bounds branch
std::unique_ptr<BasicBlock> new_blk_ptr(
new BasicBlock(std::move(valid_label)));
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builder.SetInsertPoint(&*new_blk_ptr);
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uint32_t new_ref_id = CloneOriginalReference(ref, &builder);
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(void)builder.AddBranch(merge_blk_id);
new_blocks->push_back(std::move(new_blk_ptr));
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// Gen invalid block
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new_blk_ptr.reset(new BasicBlock(std::move(invalid_label)));
builder.SetInsertPoint(&*new_blk_ptr);
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uint32_t u_index_id = GenUintCastCode(ref->index_id, &builder);
GenDebugStreamWrite(uid2offset_[ref->ref_inst->unique_id()], stage_idx,
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{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
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uint32_t ref_type_id = ref->ref_inst->type_id();
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(void)builder.AddBranch(merge_blk_id);
new_blocks->push_back(std::move(new_blk_ptr));
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// Gen merge block
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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
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// reference.
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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});
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context()->ReplaceAllUsesWith(ref->ref_inst->result_id(),
phi_inst->result_id());
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}
new_blocks->push_back(std::move(new_blk_ptr));
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context()->KillInst(ref->ref_inst);
}
void InstBindlessCheckPass::GenBoundsCheckCode(
BasicBlock::iterator ref_inst_itr,
UptrVectorIterator<BasicBlock> ref_block_itr, uint32_t stage_idx,
std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
// Look for reference through indexed descriptor. If found, analyze and
// save components. If not, return.
ref_analysis ref;
if (!AnalyzeDescriptorReference(&*ref_inst_itr, &ref)) return;
Instruction* ptr_inst = get_def_use_mgr()->GetDef(ref.ptr_id);
if (ptr_inst->opcode() != SpvOp::SpvOpAccessChain) return;
// If index and bound both compile-time constants and index < bound,
// return without changing
Instruction* var_inst = get_def_use_mgr()->GetDef(ref.var_id);
uint32_t var_type_id = var_inst->type_id();
Instruction* var_type_inst = get_def_use_mgr()->GetDef(var_type_id);
uint32_t desc_type_id =
var_type_inst->GetSingleWordInOperand(kSpvTypePointerTypeIdInIdx);
Instruction* desc_type_inst = get_def_use_mgr()->GetDef(desc_type_id);
uint32_t length_id = 0;
if (desc_type_inst->opcode() == SpvOpTypeArray) {
length_id =
desc_type_inst->GetSingleWordInOperand(kSpvTypeArrayLengthIdInIdx);
Instruction* index_inst = get_def_use_mgr()->GetDef(ref.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 (!input_length_enabled_ ||
desc_type_inst->opcode() != SpvOpTypeRuntimeArray) {
return;
}
// Move original block's preceding instructions into first new block
std::unique_ptr<BasicBlock> new_blk_ptr;
MovePreludeCode(ref_inst_itr, ref_block_itr, &new_blk_ptr);
InstructionBuilder builder(
context(), &*new_blk_ptr,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
new_blocks->push_back(std::move(new_blk_ptr));
uint32_t error_id = builder.GetUintConstantId(kInstErrorBindlessBounds);
// 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(desc_type_inst->opcode() == SpvOpTypeRuntimeArray &&
"unexpected bindless type");
length_id = GenDebugReadLength(ref.var_id, &builder);
}
// Generate full runtime bounds test code with true branch
// being full reference and false branch being debug output and zero
// for the referenced value.
Instruction* ult_inst =
builder.AddBinaryOp(GetBoolId(), SpvOpULessThan, ref.index_id, length_id);
GenCheckCode(ult_inst->result_id(), error_id, length_id, stage_idx, &ref,
new_blocks);
// Move original block's remaining code into remainder/merge block and add
// to new blocks
BasicBlock* back_blk_ptr = &*new_blocks->back();
MovePostludeCode(ref_block_itr, back_blk_ptr);
}
void InstBindlessCheckPass::GenInitCheckCode(
BasicBlock::iterator ref_inst_itr,
UptrVectorIterator<BasicBlock> ref_block_itr, uint32_t stage_idx,
std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
// Look for reference through descriptor. If not, return.
ref_analysis ref;
if (!AnalyzeDescriptorReference(&*ref_inst_itr, &ref)) return;
// Move original block's preceding instructions into first new block
std::unique_ptr<BasicBlock> new_blk_ptr;
MovePreludeCode(ref_inst_itr, ref_block_itr, &new_blk_ptr);
InstructionBuilder builder(
context(), &*new_blk_ptr,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
new_blocks->push_back(std::move(new_blk_ptr));
// Read initialization status from debug input buffer. If index id not yet
// set, binding is single descriptor, so set index to constant 0.
uint32_t zero_id = builder.GetUintConstantId(0u);
if (ref.index_id == 0) ref.index_id = zero_id;
uint32_t init_id = GenDebugReadInit(ref.var_id, ref.index_id, &builder);
// Generate full runtime non-zero init test code with true branch
// being full reference and false branch being debug output and zero
// for the referenced value.
Instruction* uneq_inst =
builder.AddBinaryOp(GetBoolId(), SpvOpINotEqual, init_id, zero_id);
uint32_t error_id = builder.GetUintConstantId(kInstErrorBindlessUninit);
GenCheckCode(uneq_inst->result_id(), error_id, zero_id, stage_idx, &ref,
new_blocks);
// Move original block's remaining code into remainder/merge block and add
// to new blocks
BasicBlock* back_blk_ptr = &*new_blocks->back();
MovePostludeCode(ref_block_itr, back_blk_ptr);
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}
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 length support enabled,
// create variable mappings. Length support is always enabled if descriptor
// init check is enabled.
if (ext_descriptor_indexing_defined_ && input_length_enabled_)
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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() {
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// Perform bindless bounds check on each entry point function in module
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InstProcessFunction pfn =
[this](BasicBlock::iterator ref_inst_itr,
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UptrVectorIterator<BasicBlock> ref_block_itr, uint32_t stage_idx,
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std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
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return GenBoundsCheckCode(ref_inst_itr, ref_block_itr, stage_idx,
new_blocks);
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};
bool modified = InstProcessEntryPointCallTree(pfn);
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if (ext_descriptor_indexing_defined_ && input_init_enabled_) {
// Perform descriptor initialization check on each entry point function in
// module
pfn = [this](BasicBlock::iterator ref_inst_itr,
UptrVectorIterator<BasicBlock> ref_block_itr,
uint32_t stage_idx,
std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
return GenInitCheckCode(ref_inst_itr, ref_block_itr, stage_idx,
new_blocks);
};
modified |= InstProcessEntryPointCallTree(pfn);
}
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return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
}
Pass::Status InstBindlessCheckPass::Process() {
InitializeInstBindlessCheck();
return ProcessImpl();
}
} // namespace opt
} // namespace spvtools