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https://github.com/KhronosGroup/SPIRV-Tools
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b5d60826e9
Remove stage specific debug info that is only needed by GPU-AV. This allows debug printfs to be used in multi-stage shader modules. Fixes #4892
199 lines
8.4 KiB
C++
199 lines
8.4 KiB
C++
// Copyright (c) 2020 The Khronos Group Inc.
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// Copyright (c) 2020 Valve Corporation
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// Copyright (c) 2020 LunarG Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef LIBSPIRV_OPT_INST_DEBUG_PRINTF_PASS_H_
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#define LIBSPIRV_OPT_INST_DEBUG_PRINTF_PASS_H_
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#include "instrument_pass.h"
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namespace spvtools {
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namespace opt {
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// This class/pass is designed to support the debug printf GPU-assisted layer
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// of https://github.com/KhronosGroup/Vulkan-ValidationLayers. Its internal and
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// external design may change as the layer evolves.
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class InstDebugPrintfPass : public InstrumentPass {
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public:
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// For test harness only
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InstDebugPrintfPass() : InstrumentPass(7, 23, false, false) {}
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// For all other interfaces
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InstDebugPrintfPass(uint32_t desc_set, uint32_t shader_id)
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: InstrumentPass(desc_set, shader_id, false, false) {}
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~InstDebugPrintfPass() override = default;
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// See optimizer.hpp for pass user documentation.
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Status Process() override;
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const char* name() const override { return "inst-printf-pass"; }
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private:
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// Gen code into |builder| to write |field_value_id| into debug output
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// buffer at |base_offset_id| + |field_offset|.
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void GenDebugOutputFieldCode(uint32_t base_offset_id, uint32_t field_offset,
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uint32_t field_value_id,
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InstructionBuilder* builder);
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// Generate instructions in |builder| which will atomically fetch and
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// increment the size of the debug output buffer stream of the current
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// validation and write a record to the end of the stream, if enough space
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// in the buffer remains. The record will contain the index of the function
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// and instruction within that function |func_idx, instruction_idx| which
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// generated the record. Finally, the record will contain validation-specific
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// data contained in |validation_ids| which will identify the validation
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// error as well as the values involved in the error.
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//
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// The output buffer binding written to by the code generated by the function
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// is determined by the validation id specified when each specific
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// instrumentation pass is created.
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//
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// The output buffer is a sequence of 32-bit values with the following
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// format (where all elements are unsigned 32-bit unless otherwise noted):
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//
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// Size
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// Record0
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// Record1
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// Record2
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// ...
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//
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// Size is the number of 32-bit values that have been written or
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// attempted to be written to the output buffer, excluding the Size. It is
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// initialized to 0. If the size of attempts to write the buffer exceeds
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// the actual size of the buffer, it is possible that this field can exceed
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// the actual size of the buffer.
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//
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// Each Record* is a variable-length sequence of 32-bit values with the
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// following format defined using static const offsets in the .cpp file:
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//
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// Record Size
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// Shader ID
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// Instruction Index
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// ...
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// Validation Error Code
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// Validation-specific Word 0
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// Validation-specific Word 1
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// Validation-specific Word 2
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// ...
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//
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// Each record consists of two subsections: members common across all
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// validation and members specific to a
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// validation.
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//
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// The Record Size is the number of 32-bit words in the record, including
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// the Record Size word.
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//
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// Shader ID is a value that identifies which shader has generated the
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// validation error. It is passed when the instrumentation pass is created.
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//
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// The Instruction Index is the position of the instruction within the
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// SPIR-V file which is in error.
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//
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// The Validation Error Code specifies the exact error which has occurred.
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// These are enumerated with the kInstError* static consts. This allows
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// multiple validation layers to use the same, single output buffer.
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//
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// The Validation-specific Words are a validation-specific number of 32-bit
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// words which give further information on the validation error that
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// occurred. These are documented further in each file containing the
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// validation-specific class which derives from this base class.
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//
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// Because the code that is generated checks against the size of the buffer
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// before writing, the size of the debug out buffer can be used by the
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// validation layer to control the number of error records that are written.
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void GenDebugStreamWrite(uint32_t shader_id, uint32_t instruction_idx_id,
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const std::vector<uint32_t>& validation_ids,
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InstructionBuilder* builder);
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// Return id for output function. Define if it doesn't exist with
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// |val_spec_param_cnt| validation-specific uint32 parameters.
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uint32_t GetStreamWriteFunctionId(uint32_t val_spec_param_cnt);
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// Generate instructions for OpDebugPrintf.
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//
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// If |ref_inst_itr| is an OpDebugPrintf, return in |new_blocks| the result
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// of replacing it with buffer write instructions within its block at
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// |ref_block_itr|. The instructions write a record to the printf
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// output buffer stream including |function_idx, instruction_idx|
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// and removes the OpDebugPrintf. The block at |ref_block_itr| can just be
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// replaced with the block in |new_blocks|. Besides the buffer writes, this
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// block will comprise all instructions preceding and following
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// |ref_inst_itr|.
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//
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// This function is designed to be passed to
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// InstrumentPass::InstProcessEntryPointCallTree(), which applies the
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// function to each instruction in a module and replaces the instruction
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// if warranted.
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//
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// This instrumentation function utilizes GenDebugStreamWrite() to write its
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// error records. The validation-specific part of the error record will
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// consist of a uint32 which is the id of the format string plus a sequence
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// of uint32s representing the values of the remaining operands of the
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// DebugPrintf.
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void GenDebugPrintfCode(BasicBlock::iterator ref_inst_itr,
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UptrVectorIterator<BasicBlock> ref_block_itr,
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std::vector<std::unique_ptr<BasicBlock>>* new_blocks);
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// Generate a sequence of uint32 instructions in |builder| (if necessary)
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// representing the value of |val_inst|, which must be a buffer pointer, a
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// uint64, or a scalar or vector of type uint32, float32 or float16. Append
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// the ids of all values to the end of |val_ids|.
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void GenOutputValues(Instruction* val_inst, std::vector<uint32_t>* val_ids,
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InstructionBuilder* builder);
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// Generate instructions to write a record containing the operands of
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// |printf_inst| arguments to printf buffer, adding new code to the end of
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// the last block in |new_blocks|. Kill OpDebugPrintf instruction.
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void GenOutputCode(Instruction* printf_inst,
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std::vector<std::unique_ptr<BasicBlock>>* new_blocks);
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// Set the name for a function or global variable, names will be
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// prefixed to identify which instrumentation pass generated them.
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std::unique_ptr<Instruction> NewGlobalName(uint32_t id,
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const std::string& name_str);
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// Set the name for a structure member
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std::unique_ptr<Instruction> NewMemberName(uint32_t id, uint32_t member_index,
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const std::string& name_str);
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// Return id for debug output buffer
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uint32_t GetOutputBufferId();
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// Return id for buffer uint type
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uint32_t GetOutputBufferPtrId();
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// Return binding for output buffer for current validation.
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uint32_t GetOutputBufferBinding();
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// Initialize state for instrumenting bindless checking
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void InitializeInstDebugPrintf();
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// Apply GenDebugPrintfCode to every instruction in module.
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Pass::Status ProcessImpl();
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uint32_t ext_inst_printf_id_{0};
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// id for output buffer variable
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uint32_t output_buffer_id_{0};
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// ptr type id for output buffer element
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uint32_t output_buffer_ptr_id_{0};
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_INST_DEBUG_PRINTF_PASS_H_
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