SPIRV-Tools/source/opt/inst_debug_printf_pass.cpp

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// Copyright (c) 2020 The Khronos Group Inc.
// Copyright (c) 2020 Valve Corporation
// Copyright (c) 2020 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_debug_printf_pass.h"
#include "source/util/string_utils.h"
#include "spirv/unified1/NonSemanticDebugPrintf.h"
namespace spvtools {
namespace opt {
void InstDebugPrintfPass::GenOutputValues(Instruction* val_inst,
std::vector<uint32_t>* val_ids,
InstructionBuilder* builder) {
uint32_t val_ty_id = val_inst->type_id();
analysis::TypeManager* type_mgr = context()->get_type_mgr();
analysis::Type* val_ty = type_mgr->GetType(val_ty_id);
switch (val_ty->kind()) {
case analysis::Type::kVector: {
analysis::Vector* v_ty = val_ty->AsVector();
const analysis::Type* c_ty = v_ty->element_type();
uint32_t c_ty_id = type_mgr->GetId(c_ty);
for (uint32_t c = 0; c < v_ty->element_count(); ++c) {
Instruction* c_inst =
builder->AddCompositeExtract(c_ty_id, val_inst->result_id(), {c});
GenOutputValues(c_inst, val_ids, builder);
}
return;
}
case analysis::Type::kBool: {
// Select between uint32 zero or one
uint32_t zero_id = builder->GetUintConstantId(0);
uint32_t one_id = builder->GetUintConstantId(1);
Instruction* sel_inst = builder->AddSelect(
GetUintId(), val_inst->result_id(), one_id, zero_id);
val_ids->push_back(sel_inst->result_id());
return;
}
case analysis::Type::kFloat: {
analysis::Float* f_ty = val_ty->AsFloat();
switch (f_ty->width()) {
case 16: {
// Convert float16 to float32 and recurse
Instruction* f32_inst = builder->AddUnaryOp(
GetFloatId(), spv::Op::OpFConvert, val_inst->result_id());
GenOutputValues(f32_inst, val_ids, builder);
return;
}
case 64: {
// Bitcast float64 to uint64 and recurse
Instruction* ui64_inst = builder->AddUnaryOp(
GetUint64Id(), spv::Op::OpBitcast, val_inst->result_id());
GenOutputValues(ui64_inst, val_ids, builder);
return;
}
case 32: {
// Bitcase float32 to uint32
Instruction* bc_inst = builder->AddUnaryOp(
GetUintId(), spv::Op::OpBitcast, val_inst->result_id());
val_ids->push_back(bc_inst->result_id());
return;
}
default:
assert(false && "unsupported float width");
return;
}
}
case analysis::Type::kInteger: {
analysis::Integer* i_ty = val_ty->AsInteger();
switch (i_ty->width()) {
case 64: {
Instruction* ui64_inst = val_inst;
if (i_ty->IsSigned()) {
// Bitcast sint64 to uint64
ui64_inst = builder->AddUnaryOp(GetUint64Id(), spv::Op::OpBitcast,
val_inst->result_id());
}
// Break uint64 into 2x uint32
Instruction* lo_ui64_inst = builder->AddUnaryOp(
GetUintId(), spv::Op::OpUConvert, ui64_inst->result_id());
Instruction* rshift_ui64_inst = builder->AddBinaryOp(
GetUint64Id(), spv::Op::OpShiftRightLogical,
ui64_inst->result_id(), builder->GetUintConstantId(32));
Instruction* hi_ui64_inst = builder->AddUnaryOp(
GetUintId(), spv::Op::OpUConvert, rshift_ui64_inst->result_id());
val_ids->push_back(lo_ui64_inst->result_id());
val_ids->push_back(hi_ui64_inst->result_id());
return;
}
case 8: {
Instruction* ui8_inst = val_inst;
if (i_ty->IsSigned()) {
// Bitcast sint8 to uint8
ui8_inst = builder->AddUnaryOp(GetUint8Id(), spv::Op::OpBitcast,
val_inst->result_id());
}
// Convert uint8 to uint32
Instruction* ui32_inst = builder->AddUnaryOp(
GetUintId(), spv::Op::OpUConvert, ui8_inst->result_id());
val_ids->push_back(ui32_inst->result_id());
return;
}
case 32: {
Instruction* ui32_inst = val_inst;
if (i_ty->IsSigned()) {
// Bitcast sint32 to uint32
ui32_inst = builder->AddUnaryOp(GetUintId(), spv::Op::OpBitcast,
val_inst->result_id());
}
// uint32 needs no further processing
val_ids->push_back(ui32_inst->result_id());
return;
}
default:
// TODO(greg-lunarg): Support non-32-bit int
assert(false && "unsupported int width");
return;
}
}
default:
assert(false && "unsupported type");
return;
}
}
void InstDebugPrintfPass::GenOutputCode(
Instruction* printf_inst, uint32_t stage_idx,
std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
BasicBlock* back_blk_ptr = &*new_blocks->back();
InstructionBuilder builder(
context(), back_blk_ptr,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
// Gen debug printf record validation-specific values. The format string
// will have its id written. Vectors will need to be broken down into
// component values. float16 will need to be converted to float32. Pointer
// and uint64 will need to be converted to two uint32 values. float32 will
// need to be bitcast to uint32. int32 will need to be bitcast to uint32.
std::vector<uint32_t> val_ids;
bool is_first_operand = false;
printf_inst->ForEachInId(
[&is_first_operand, &val_ids, &builder, this](const uint32_t* iid) {
// skip set operand
if (!is_first_operand) {
is_first_operand = true;
return;
}
Instruction* opnd_inst = get_def_use_mgr()->GetDef(*iid);
if (opnd_inst->opcode() == spv::Op::OpString) {
uint32_t string_id_id = builder.GetUintConstantId(*iid);
val_ids.push_back(string_id_id);
} else {
GenOutputValues(opnd_inst, &val_ids, &builder);
}
});
GenDebugStreamWrite(uid2offset_[printf_inst->unique_id()], stage_idx, val_ids,
&builder);
context()->KillInst(printf_inst);
}
void InstDebugPrintfPass::GenDebugPrintfCode(
BasicBlock::iterator ref_inst_itr,
UptrVectorIterator<BasicBlock> ref_block_itr, uint32_t stage_idx,
std::vector<std::unique_ptr<BasicBlock>>* new_blocks) {
// If not DebugPrintf OpExtInst, return.
Instruction* printf_inst = &*ref_inst_itr;
if (printf_inst->opcode() != spv::Op::OpExtInst) return;
if (printf_inst->GetSingleWordInOperand(0) != ext_inst_printf_id_) return;
if (printf_inst->GetSingleWordInOperand(1) !=
NonSemanticDebugPrintfDebugPrintf)
return;
// Initialize DefUse manager before dismantling module
(void)get_def_use_mgr();
// 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);
new_blocks->push_back(std::move(new_blk_ptr));
// Generate instructions to output printf args to printf buffer
GenOutputCode(printf_inst, stage_idx, new_blocks);
// Caller expects at least two blocks with last block containing remaining
// code, so end block after instrumentation, create remainder block, and
// branch to it
uint32_t rem_blk_id = TakeNextId();
std::unique_ptr<Instruction> rem_label(NewLabel(rem_blk_id));
BasicBlock* back_blk_ptr = &*new_blocks->back();
InstructionBuilder builder(
context(), back_blk_ptr,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
(void)builder.AddBranch(rem_blk_id);
// Gen remainder block
new_blk_ptr.reset(new BasicBlock(std::move(rem_label)));
builder.SetInsertPoint(&*new_blk_ptr);
// Move original block's remaining code into remainder block and add
// to new blocks
MovePostludeCode(ref_block_itr, &*new_blk_ptr);
new_blocks->push_back(std::move(new_blk_ptr));
}
void InstDebugPrintfPass::InitializeInstDebugPrintf() {
// Initialize base class
InitializeInstrument();
}
Pass::Status InstDebugPrintfPass::ProcessImpl() {
// Perform printf instrumentation on each entry point function in module
InstProcessFunction 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 GenDebugPrintfCode(ref_inst_itr, ref_block_itr, stage_idx,
new_blocks);
};
(void)InstProcessEntryPointCallTree(pfn);
// Remove DebugPrintf OpExtInstImport instruction
Instruction* ext_inst_import_inst =
get_def_use_mgr()->GetDef(ext_inst_printf_id_);
context()->KillInst(ext_inst_import_inst);
// If no remaining non-semantic instruction sets, remove non-semantic debug
// info extension from module and feature manager
bool non_sem_set_seen = false;
for (auto c_itr = context()->module()->ext_inst_import_begin();
c_itr != context()->module()->ext_inst_import_end(); ++c_itr) {
const std::string set_name = c_itr->GetInOperand(0).AsString();
if (spvtools::utils::starts_with(set_name, "NonSemantic.")) {
non_sem_set_seen = true;
break;
}
}
if (!non_sem_set_seen) {
for (auto c_itr = context()->module()->extension_begin();
c_itr != context()->module()->extension_end(); ++c_itr) {
const std::string ext_name = c_itr->GetInOperand(0).AsString();
if (ext_name == "SPV_KHR_non_semantic_info") {
context()->KillInst(&*c_itr);
break;
}
}
context()->get_feature_mgr()->RemoveExtension(kSPV_KHR_non_semantic_info);
}
return Status::SuccessWithChange;
}
Pass::Status InstDebugPrintfPass::Process() {
ext_inst_printf_id_ =
get_module()->GetExtInstImportId("NonSemantic.DebugPrintf");
if (ext_inst_printf_id_ == 0) return Status::SuccessWithoutChange;
InitializeInstDebugPrintf();
return ProcessImpl();
}
} // namespace opt
} // namespace spvtools