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third_party_spirv-tools/source/disassemble.cpp
Shahbaz Youssefi 4322c4b5a7
Refactor the disassembler code for reuse (#4616) 
The upcoming spirv-diff tool also outputs disassembly, although in a
per-instruction basis.  This change refactors the disassembler code to
support such a use case.
2021-12-14 09:46:59 -05:00

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// Copyright (c) 2015-2020 The Khronos Group Inc.
// Modifications Copyright (C) 2020 Advanced Micro Devices, Inc. All rights
// reserved.
//
// 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.
// This file contains a disassembler: It converts a SPIR-V binary
// to text.
#include "source/disassemble.h"
#include <algorithm>
#include <cassert>
#include <cstring>
#include <iomanip>
#include <memory>
#include <unordered_map>
#include <utility>
#include "source/assembly_grammar.h"
#include "source/binary.h"
#include "source/diagnostic.h"
#include "source/ext_inst.h"
#include "source/opcode.h"
#include "source/parsed_operand.h"
#include "source/print.h"
#include "source/spirv_constant.h"
#include "source/spirv_endian.h"
#include "source/util/hex_float.h"
#include "source/util/make_unique.h"
#include "spirv-tools/libspirv.h"
namespace spvtools {
namespace {
// A Disassembler instance converts a SPIR-V binary to its assembly
// representation.
class Disassembler {
public:
Disassembler(const AssemblyGrammar& grammar, uint32_t options,
NameMapper name_mapper)
: print_(spvIsInBitfield(SPV_BINARY_TO_TEXT_OPTION_PRINT, options)),
text_(),
out_(print_ ? out_stream() : out_stream(text_)),
instruction_disassembler_(grammar, out_.get(), options, name_mapper),
header_(!spvIsInBitfield(SPV_BINARY_TO_TEXT_OPTION_NO_HEADER, options)),
byte_offset_(0) {}
// Emits the assembly header for the module, and sets up internal state
// so subsequent callbacks can handle the cases where the entire module
// is either big-endian or little-endian.
spv_result_t HandleHeader(spv_endianness_t endian, uint32_t version,
uint32_t generator, uint32_t id_bound,
uint32_t schema);
// Emits the assembly text for the given instruction.
spv_result_t HandleInstruction(const spv_parsed_instruction_t& inst);
// If not printing, populates text_result with the accumulated text.
// Returns SPV_SUCCESS on success.
spv_result_t SaveTextResult(spv_text* text_result) const;
private:
const bool print_; // Should we also print to the standard output stream?
spv_endianness_t endian_; // The detected endianness of the binary.
std::stringstream text_; // Captures the text, if not printing.
out_stream out_; // The Output stream. Either to text_ or standard output.
disassemble::InstructionDisassembler instruction_disassembler_;
const bool header_; // Should we output header as the leading comment?
size_t byte_offset_; // The number of bytes processed so far.
bool inserted_decoration_space_ = false;
bool inserted_debug_space_ = false;
bool inserted_type_space_ = false;
};
spv_result_t Disassembler::HandleHeader(spv_endianness_t endian,
uint32_t version, uint32_t generator,
uint32_t id_bound, uint32_t schema) {
endian_ = endian;
if (header_) {
instruction_disassembler_.EmitHeaderSpirv();
instruction_disassembler_.EmitHeaderVersion(version);
instruction_disassembler_.EmitHeaderGenerator(generator);
instruction_disassembler_.EmitHeaderIdBound(id_bound);
instruction_disassembler_.EmitHeaderSchema(schema);
}
byte_offset_ = SPV_INDEX_INSTRUCTION * sizeof(uint32_t);
return SPV_SUCCESS;
}
spv_result_t Disassembler::HandleInstruction(
const spv_parsed_instruction_t& inst) {
instruction_disassembler_.EmitSectionComment(inst, inserted_decoration_space_,
inserted_debug_space_,
inserted_type_space_);
instruction_disassembler_.EmitInstruction(inst, byte_offset_);
byte_offset_ += inst.num_words * sizeof(uint32_t);
return SPV_SUCCESS;
}
spv_result_t Disassembler::SaveTextResult(spv_text* text_result) const {
if (!print_) {
size_t length = text_.str().size();
char* str = new char[length + 1];
if (!str) return SPV_ERROR_OUT_OF_MEMORY;
strncpy(str, text_.str().c_str(), length + 1);
spv_text text = new spv_text_t();
if (!text) {
delete[] str;
return SPV_ERROR_OUT_OF_MEMORY;
}
text->str = str;
text->length = length;
*text_result = text;
}
return SPV_SUCCESS;
}
spv_result_t DisassembleHeader(void* user_data, spv_endianness_t endian,
uint32_t /* magic */, uint32_t version,
uint32_t generator, uint32_t id_bound,
uint32_t schema) {
assert(user_data);
auto disassembler = static_cast<Disassembler*>(user_data);
return disassembler->HandleHeader(endian, version, generator, id_bound,
schema);
}
spv_result_t DisassembleInstruction(
void* user_data, const spv_parsed_instruction_t* parsed_instruction) {
assert(user_data);
auto disassembler = static_cast<Disassembler*>(user_data);
return disassembler->HandleInstruction(*parsed_instruction);
}
// Simple wrapper class to provide extra data necessary for targeted
// instruction disassembly.
class WrappedDisassembler {
public:
WrappedDisassembler(Disassembler* dis, const uint32_t* binary, size_t wc)
: disassembler_(dis), inst_binary_(binary), word_count_(wc) {}
Disassembler* disassembler() { return disassembler_; }
const uint32_t* inst_binary() const { return inst_binary_; }
size_t word_count() const { return word_count_; }
private:
Disassembler* disassembler_;
const uint32_t* inst_binary_;
const size_t word_count_;
};
spv_result_t DisassembleTargetHeader(void* user_data, spv_endianness_t endian,
uint32_t /* magic */, uint32_t version,
uint32_t generator, uint32_t id_bound,
uint32_t schema) {
assert(user_data);
auto wrapped = static_cast<WrappedDisassembler*>(user_data);
return wrapped->disassembler()->HandleHeader(endian, version, generator,
id_bound, schema);
}
spv_result_t DisassembleTargetInstruction(
void* user_data, const spv_parsed_instruction_t* parsed_instruction) {
assert(user_data);
auto wrapped = static_cast<WrappedDisassembler*>(user_data);
// Check if this is the instruction we want to disassemble.
if (wrapped->word_count() == parsed_instruction->num_words &&
std::equal(wrapped->inst_binary(),
wrapped->inst_binary() + wrapped->word_count(),
parsed_instruction->words)) {
// Found the target instruction. Disassemble it and signal that we should
// stop searching so we don't output the same instruction again.
if (auto error =
wrapped->disassembler()->HandleInstruction(*parsed_instruction))
return error;
return SPV_REQUESTED_TERMINATION;
}
return SPV_SUCCESS;
}
constexpr int kStandardIndent = 15;
} // namespace
namespace disassemble {
InstructionDisassembler::InstructionDisassembler(const AssemblyGrammar& grammar,
std::ostream& stream,
uint32_t options,
NameMapper name_mapper)
: grammar_(grammar),
stream_(stream),
print_(spvIsInBitfield(SPV_BINARY_TO_TEXT_OPTION_PRINT, options)),
color_(spvIsInBitfield(SPV_BINARY_TO_TEXT_OPTION_COLOR, options)),
indent_(spvIsInBitfield(SPV_BINARY_TO_TEXT_OPTION_INDENT, options)
? kStandardIndent
: 0),
comment_(spvIsInBitfield(SPV_BINARY_TO_TEXT_OPTION_COMMENT, options)),
show_byte_offset_(
spvIsInBitfield(SPV_BINARY_TO_TEXT_OPTION_SHOW_BYTE_OFFSET, options)),
name_mapper_(std::move(name_mapper)) {}
void InstructionDisassembler::EmitHeaderSpirv() { stream_ << "; SPIR-V\n"; }
void InstructionDisassembler::EmitHeaderVersion(uint32_t version) {
stream_ << "; Version: " << SPV_SPIRV_VERSION_MAJOR_PART(version) << "."
<< SPV_SPIRV_VERSION_MINOR_PART(version) << "\n";
}
void InstructionDisassembler::EmitHeaderGenerator(uint32_t generator) {
const char* generator_tool =
spvGeneratorStr(SPV_GENERATOR_TOOL_PART(generator));
stream_ << "; Generator: " << generator_tool;
// For unknown tools, print the numeric tool value.
if (0 == strcmp("Unknown", generator_tool)) {
stream_ << "(" << SPV_GENERATOR_TOOL_PART(generator) << ")";
}
// Print the miscellaneous part of the generator word on the same
// line as the tool name.
stream_ << "; " << SPV_GENERATOR_MISC_PART(generator) << "\n";
}
void InstructionDisassembler::EmitHeaderIdBound(uint32_t id_bound) {
stream_ << "; Bound: " << id_bound << "\n";
}
void InstructionDisassembler::EmitHeaderSchema(uint32_t schema) {
stream_ << "; Schema: " << schema << "\n";
}
void InstructionDisassembler::EmitInstruction(
const spv_parsed_instruction_t& inst, size_t inst_byte_offset) {
auto opcode = static_cast<SpvOp>(inst.opcode);
if (inst.result_id) {
SetBlue();
const std::string id_name = name_mapper_(inst.result_id);
if (indent_)
stream_ << std::setw(std::max(0, indent_ - 3 - int(id_name.size())));
stream_ << "%" << id_name;
ResetColor();
stream_ << " = ";
} else {
stream_ << std::string(indent_, ' ');
}
stream_ << "Op" << spvOpcodeString(opcode);
for (uint16_t i = 0; i < inst.num_operands; i++) {
const spv_operand_type_t type = inst.operands[i].type;
assert(type != SPV_OPERAND_TYPE_NONE);
if (type == SPV_OPERAND_TYPE_RESULT_ID) continue;
stream_ << " ";
EmitOperand(inst, i);
}
if (comment_ && opcode == SpvOpName) {
const spv_parsed_operand_t& operand = inst.operands[0];
const uint32_t word = inst.words[operand.offset];
stream_ << " ; id %" << word;
}
if (show_byte_offset_) {
SetGrey();
auto saved_flags = stream_.flags();
auto saved_fill = stream_.fill();
stream_ << " ; 0x" << std::setw(8) << std::hex << std::setfill('0')
<< inst_byte_offset;
stream_.flags(saved_flags);
stream_.fill(saved_fill);
ResetColor();
}
stream_ << "\n";
}
void InstructionDisassembler::EmitSectionComment(
const spv_parsed_instruction_t& inst, bool& inserted_decoration_space,
bool& inserted_debug_space, bool& inserted_type_space) {
auto opcode = static_cast<SpvOp>(inst.opcode);
if (comment_ && opcode == SpvOpFunction) {
stream_ << std::endl;
stream_ << std::string(indent_, ' ');
stream_ << "; Function " << name_mapper_(inst.result_id) << std::endl;
}
if (comment_ && !inserted_decoration_space && spvOpcodeIsDecoration(opcode)) {
inserted_decoration_space = true;
stream_ << std::endl;
stream_ << std::string(indent_, ' ');
stream_ << "; Annotations" << std::endl;
}
if (comment_ && !inserted_debug_space && spvOpcodeIsDebug(opcode)) {
inserted_debug_space = true;
stream_ << std::endl;
stream_ << std::string(indent_, ' ');
stream_ << "; Debug Information" << std::endl;
}
if (comment_ && !inserted_type_space && spvOpcodeGeneratesType(opcode)) {
inserted_type_space = true;
stream_ << std::endl;
stream_ << std::string(indent_, ' ');
stream_ << "; Types, variables and constants" << std::endl;
}
}
void InstructionDisassembler::EmitOperand(const spv_parsed_instruction_t& inst,
const uint16_t operand_index) {
assert(operand_index < inst.num_operands);
const spv_parsed_operand_t& operand = inst.operands[operand_index];
const uint32_t word = inst.words[operand.offset];
switch (operand.type) {
case SPV_OPERAND_TYPE_RESULT_ID:
assert(false && "<result-id> is not supposed to be handled here");
SetBlue();
stream_ << "%" << name_mapper_(word);
break;
case SPV_OPERAND_TYPE_ID:
case SPV_OPERAND_TYPE_TYPE_ID:
case SPV_OPERAND_TYPE_SCOPE_ID:
case SPV_OPERAND_TYPE_MEMORY_SEMANTICS_ID:
SetYellow();
stream_ << "%" << name_mapper_(word);
break;
case SPV_OPERAND_TYPE_EXTENSION_INSTRUCTION_NUMBER: {
spv_ext_inst_desc ext_inst;
SetRed();
if (grammar_.lookupExtInst(inst.ext_inst_type, word, &ext_inst) ==
SPV_SUCCESS) {
stream_ << ext_inst->name;
} else {
if (!spvExtInstIsNonSemantic(inst.ext_inst_type)) {
assert(false && "should have caught this earlier");
} else {
// for non-semantic instruction sets we can just print the number
stream_ << word;
}
}
} break;
case SPV_OPERAND_TYPE_SPEC_CONSTANT_OP_NUMBER: {
spv_opcode_desc opcode_desc;
if (grammar_.lookupOpcode(SpvOp(word), &opcode_desc))
assert(false && "should have caught this earlier");
SetRed();
stream_ << opcode_desc->name;
} break;
case SPV_OPERAND_TYPE_LITERAL_INTEGER:
case SPV_OPERAND_TYPE_TYPED_LITERAL_NUMBER: {
SetRed();
EmitNumericLiteral(&stream_, inst, operand);
ResetColor();
} break;
case SPV_OPERAND_TYPE_LITERAL_STRING: {
stream_ << "\"";
SetGreen();
std::string str = spvDecodeLiteralStringOperand(inst, operand_index);
for (char const& c : str) {
if (c == '"' || c == '\\') stream_ << '\\';
stream_ << c;
}
ResetColor();
stream_ << '"';
} break;
case SPV_OPERAND_TYPE_CAPABILITY:
case SPV_OPERAND_TYPE_SOURCE_LANGUAGE:
case SPV_OPERAND_TYPE_EXECUTION_MODEL:
case SPV_OPERAND_TYPE_ADDRESSING_MODEL:
case SPV_OPERAND_TYPE_MEMORY_MODEL:
case SPV_OPERAND_TYPE_EXECUTION_MODE:
case SPV_OPERAND_TYPE_STORAGE_CLASS:
case SPV_OPERAND_TYPE_DIMENSIONALITY:
case SPV_OPERAND_TYPE_SAMPLER_ADDRESSING_MODE:
case SPV_OPERAND_TYPE_SAMPLER_FILTER_MODE:
case SPV_OPERAND_TYPE_SAMPLER_IMAGE_FORMAT:
case SPV_OPERAND_TYPE_FP_ROUNDING_MODE:
case SPV_OPERAND_TYPE_LINKAGE_TYPE:
case SPV_OPERAND_TYPE_ACCESS_QUALIFIER:
case SPV_OPERAND_TYPE_FUNCTION_PARAMETER_ATTRIBUTE:
case SPV_OPERAND_TYPE_DECORATION:
case SPV_OPERAND_TYPE_BUILT_IN:
case SPV_OPERAND_TYPE_GROUP_OPERATION:
case SPV_OPERAND_TYPE_KERNEL_ENQ_FLAGS:
case SPV_OPERAND_TYPE_KERNEL_PROFILING_INFO:
case SPV_OPERAND_TYPE_RAY_FLAGS:
case SPV_OPERAND_TYPE_RAY_QUERY_INTERSECTION:
case SPV_OPERAND_TYPE_RAY_QUERY_COMMITTED_INTERSECTION_TYPE:
case SPV_OPERAND_TYPE_RAY_QUERY_CANDIDATE_INTERSECTION_TYPE:
case SPV_OPERAND_TYPE_DEBUG_BASE_TYPE_ATTRIBUTE_ENCODING:
case SPV_OPERAND_TYPE_DEBUG_COMPOSITE_TYPE:
case SPV_OPERAND_TYPE_DEBUG_TYPE_QUALIFIER:
case SPV_OPERAND_TYPE_DEBUG_OPERATION:
case SPV_OPERAND_TYPE_CLDEBUG100_DEBUG_BASE_TYPE_ATTRIBUTE_ENCODING:
case SPV_OPERAND_TYPE_CLDEBUG100_DEBUG_COMPOSITE_TYPE:
case SPV_OPERAND_TYPE_CLDEBUG100_DEBUG_TYPE_QUALIFIER:
case SPV_OPERAND_TYPE_CLDEBUG100_DEBUG_OPERATION:
case SPV_OPERAND_TYPE_CLDEBUG100_DEBUG_IMPORTED_ENTITY:
case SPV_OPERAND_TYPE_FPDENORM_MODE:
case SPV_OPERAND_TYPE_FPOPERATION_MODE:
case SPV_OPERAND_TYPE_QUANTIZATION_MODES:
case SPV_OPERAND_TYPE_OVERFLOW_MODES: {
spv_operand_desc entry;
if (grammar_.lookupOperand(operand.type, word, &entry))
assert(false && "should have caught this earlier");
stream_ << entry->name;
} break;
case SPV_OPERAND_TYPE_FP_FAST_MATH_MODE:
case SPV_OPERAND_TYPE_FUNCTION_CONTROL:
case SPV_OPERAND_TYPE_LOOP_CONTROL:
case SPV_OPERAND_TYPE_IMAGE:
case SPV_OPERAND_TYPE_MEMORY_ACCESS:
case SPV_OPERAND_TYPE_SELECTION_CONTROL:
case SPV_OPERAND_TYPE_DEBUG_INFO_FLAGS:
case SPV_OPERAND_TYPE_CLDEBUG100_DEBUG_INFO_FLAGS:
EmitMaskOperand(operand.type, word);
break;
default:
if (spvOperandIsConcreteMask(operand.type)) {
EmitMaskOperand(operand.type, word);
} else if (spvOperandIsConcrete(operand.type)) {
spv_operand_desc entry;
if (grammar_.lookupOperand(operand.type, word, &entry))
assert(false && "should have caught this earlier");
stream_ << entry->name;
} else {
assert(false && "unhandled or invalid case");
}
break;
}
ResetColor();
}
void InstructionDisassembler::EmitMaskOperand(const spv_operand_type_t type,
const uint32_t word) {
// Scan the mask from least significant bit to most significant bit. For each
// set bit, emit the name of that bit. Separate multiple names with '|'.
uint32_t remaining_word = word;
uint32_t mask;
int num_emitted = 0;
for (mask = 1; remaining_word; mask <<= 1) {
if (remaining_word & mask) {
remaining_word ^= mask;
spv_operand_desc entry;
if (grammar_.lookupOperand(type, mask, &entry))
assert(false && "should have caught this earlier");
if (num_emitted) stream_ << "|";
stream_ << entry->name;
num_emitted++;
}
}
if (!num_emitted) {
// An operand value of 0 was provided, so represent it by the name
// of the 0 value. In many cases, that's "None".
spv_operand_desc entry;
if (SPV_SUCCESS == grammar_.lookupOperand(type, 0, &entry))
stream_ << entry->name;
}
}
void InstructionDisassembler::ResetColor() {
if (color_) stream_ << spvtools::clr::reset{print_};
}
void InstructionDisassembler::SetGrey() {
if (color_) stream_ << spvtools::clr::grey{print_};
}
void InstructionDisassembler::SetBlue() {
if (color_) stream_ << spvtools::clr::blue{print_};
}
void InstructionDisassembler::SetYellow() {
if (color_) stream_ << spvtools::clr::yellow{print_};
}
void InstructionDisassembler::SetRed() {
if (color_) stream_ << spvtools::clr::red{print_};
}
void InstructionDisassembler::SetGreen() {
if (color_) stream_ << spvtools::clr::green{print_};
}
} // namespace disassemble
std::string spvInstructionBinaryToText(const spv_target_env env,
const uint32_t* instCode,
const size_t instWordCount,
const uint32_t* code,
const size_t wordCount,
const uint32_t options) {
spv_context context = spvContextCreate(env);
const AssemblyGrammar grammar(context);
if (!grammar.isValid()) {
spvContextDestroy(context);
return "";
}
// Generate friendly names for Ids if requested.
std::unique_ptr<FriendlyNameMapper> friendly_mapper;
NameMapper name_mapper = GetTrivialNameMapper();
if (options & SPV_BINARY_TO_TEXT_OPTION_FRIENDLY_NAMES) {
friendly_mapper = MakeUnique<FriendlyNameMapper>(context, code, wordCount);
name_mapper = friendly_mapper->GetNameMapper();
}
// Now disassemble!
Disassembler disassembler(grammar, options, name_mapper);
WrappedDisassembler wrapped(&disassembler, instCode, instWordCount);
spvBinaryParse(context, &wrapped, code, wordCount, DisassembleTargetHeader,
DisassembleTargetInstruction, nullptr);
spv_text text = nullptr;
std::string output;
if (disassembler.SaveTextResult(&text) == SPV_SUCCESS) {
output.assign(text->str, text->str + text->length);
// Drop trailing newline characters.
while (!output.empty() && output.back() == '\n') output.pop_back();
}
spvTextDestroy(text);
spvContextDestroy(context);
return output;
}
} // namespace spvtools
spv_result_t spvBinaryToText(const spv_const_context context,
const uint32_t* code, const size_t wordCount,
const uint32_t options, spv_text* pText,
spv_diagnostic* pDiagnostic) {
spv_context_t hijack_context = *context;
if (pDiagnostic) {
*pDiagnostic = nullptr;
spvtools::UseDiagnosticAsMessageConsumer(&hijack_context, pDiagnostic);
}
const spvtools::AssemblyGrammar grammar(&hijack_context);
if (!grammar.isValid()) return SPV_ERROR_INVALID_TABLE;
// Generate friendly names for Ids if requested.
std::unique_ptr<spvtools::FriendlyNameMapper> friendly_mapper;
spvtools::NameMapper name_mapper = spvtools::GetTrivialNameMapper();
if (options & SPV_BINARY_TO_TEXT_OPTION_FRIENDLY_NAMES) {
friendly_mapper = spvtools::MakeUnique<spvtools::FriendlyNameMapper>(
&hijack_context, code, wordCount);
name_mapper = friendly_mapper->GetNameMapper();
}
// Now disassemble!
spvtools::Disassembler disassembler(grammar, options, name_mapper);
if (auto error =
spvBinaryParse(&hijack_context, &disassembler, code, wordCount,
spvtools::DisassembleHeader,
spvtools::DisassembleInstruction, pDiagnostic)) {
return error;
}
return disassembler.SaveTextResult(pText);
}
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