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SPIRV-Tools/source/fuzz/force_render_red.cpp
Alastair Donaldson 8d4261bc44
spirv-fuzz: Introduce TransformationContext (#3272) 
Some transformations (e.g. TransformationAddFunction) rely on running
the validator to decide whether the transformation is applicable.  A
recent change allowed spirv-fuzz to take validator options, to cater
for the case where a module should be considered valid under
particular conditions.  However, validation during the checking of
transformations had no access to these validator options.

This change introduced TransformationContext, which currently consists
of a fact manager and a set of validator options, but could in the
future have other fields corresponding to other objects that it is
useful to have access to when applying transformations.  Now, instead
of checking and applying transformations in the context of a
FactManager, a TransformationContext is used.  This gives access to
the fact manager as before, and also access to the validator options
when they are needed.
2020-04-02 15:54:46 +01:00

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// Copyright (c) 2019 Google LLC
//
// 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 "source/fuzz/force_render_red.h"
#include "source/fuzz/fact_manager.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
#include "source/fuzz/transformation_context.h"
#include "source/fuzz/transformation_replace_constant_with_uniform.h"
#include "source/fuzz/uniform_buffer_element_descriptor.h"
#include "source/opt/build_module.h"
#include "source/opt/ir_context.h"
#include "source/opt/types.h"
#include "source/util/make_unique.h"
#include "tools/util/cli_consumer.h"
#include <algorithm>
#include <utility>
namespace spvtools {
namespace fuzz {
namespace {
// Helper method to find the fragment shader entry point, complaining if there
// is no shader or if there is no fragment entry point.
opt::Function* FindFragmentShaderEntryPoint(opt::IRContext* ir_context,
MessageConsumer message_consumer) {
// Check that this is a fragment shader
bool found_capability_shader = false;
for (auto& capability : ir_context->capabilities()) {
assert(capability.opcode() == SpvOpCapability);
if (capability.GetSingleWordInOperand(0) == SpvCapabilityShader) {
found_capability_shader = true;
break;
}
}
if (!found_capability_shader) {
message_consumer(
SPV_MSG_ERROR, nullptr, {},
"Forcing of red rendering requires the Shader capability.");
return nullptr;
}
opt::Instruction* fragment_entry_point = nullptr;
for (auto& entry_point : ir_context->module()->entry_points()) {
if (entry_point.GetSingleWordInOperand(0) == SpvExecutionModelFragment) {
fragment_entry_point = &entry_point;
break;
}
}
if (fragment_entry_point == nullptr) {
message_consumer(SPV_MSG_ERROR, nullptr, {},
"Forcing of red rendering requires an entry point with "
"the Fragment execution model.");
return nullptr;
}
for (auto& function : *ir_context->module()) {
if (function.result_id() ==
fragment_entry_point->GetSingleWordInOperand(1)) {
return &function;
}
}
assert(
false &&
"A valid module must have a function associate with each entry point.");
return nullptr;
}
// Helper method to check that there is a single vec4 output variable and get a
// pointer to it.
opt::Instruction* FindVec4OutputVariable(opt::IRContext* ir_context,
MessageConsumer message_consumer) {
opt::Instruction* output_variable = nullptr;
for (auto& inst : ir_context->types_values()) {
if (inst.opcode() == SpvOpVariable &&
inst.GetSingleWordInOperand(0) == SpvStorageClassOutput) {
if (output_variable != nullptr) {
message_consumer(SPV_MSG_ERROR, nullptr, {},
"Only one output variable can be handled at present; "
"found multiple.");
return nullptr;
}
output_variable = &inst;
// Do not break, as we want to check for multiple output variables.
}
}
if (output_variable == nullptr) {
message_consumer(SPV_MSG_ERROR, nullptr, {},
"No output variable to which to write red was found.");
return nullptr;
}
auto output_variable_base_type = ir_context->get_type_mgr()
->GetType(output_variable->type_id())
->AsPointer()
->pointee_type()
->AsVector();
if (!output_variable_base_type ||
output_variable_base_type->element_count() != 4 ||
!output_variable_base_type->element_type()->AsFloat()) {
message_consumer(SPV_MSG_ERROR, nullptr, {},
"The output variable must have type vec4.");
return nullptr;
}
return output_variable;
}
// Helper to get the ids of float constants 0.0 and 1.0, creating them if
// necessary.
std::pair<uint32_t, uint32_t> FindOrCreateFloatZeroAndOne(
opt::IRContext* ir_context, opt::analysis::Float* float_type) {
float one = 1.0;
uint32_t one_as_uint;
memcpy(&one_as_uint, &one, sizeof(float));
std::vector<uint32_t> zero_bytes = {0};
std::vector<uint32_t> one_bytes = {one_as_uint};
auto constant_zero = ir_context->get_constant_mgr()->RegisterConstant(
MakeUnique<opt::analysis::FloatConstant>(float_type, zero_bytes));
auto constant_one = ir_context->get_constant_mgr()->RegisterConstant(
MakeUnique<opt::analysis::FloatConstant>(float_type, one_bytes));
auto constant_zero_id = ir_context->get_constant_mgr()
->GetDefiningInstruction(constant_zero)
->result_id();
auto constant_one_id = ir_context->get_constant_mgr()
->GetDefiningInstruction(constant_one)
->result_id();
return std::pair<uint32_t, uint32_t>(constant_zero_id, constant_one_id);
}
std::unique_ptr<TransformationReplaceConstantWithUniform>
MakeConstantUniformReplacement(opt::IRContext* ir_context,
const FactManager& fact_manager,
uint32_t constant_id,
uint32_t greater_than_instruction,
uint32_t in_operand_index) {
return MakeUnique<TransformationReplaceConstantWithUniform>(
MakeIdUseDescriptor(constant_id,
MakeInstructionDescriptor(greater_than_instruction,
SpvOpFOrdGreaterThan, 0),
in_operand_index),
fact_manager.GetUniformDescriptorsForConstant(ir_context, constant_id)[0],
ir_context->TakeNextId(), ir_context->TakeNextId());
}
} // namespace
bool ForceRenderRed(
const spv_target_env& target_env, spv_validator_options validator_options,
const std::vector<uint32_t>& binary_in,
const spvtools::fuzz::protobufs::FactSequence& initial_facts,
std::vector<uint32_t>* binary_out) {
auto message_consumer = spvtools::utils::CLIMessageConsumer;
spvtools::SpirvTools tools(target_env);
if (!tools.IsValid()) {
message_consumer(SPV_MSG_ERROR, nullptr, {},
"Failed to create SPIRV-Tools interface; stopping.");
return false;
}
// Initial binary should be valid.
if (!tools.Validate(&binary_in[0], binary_in.size(), validator_options)) {
message_consumer(SPV_MSG_ERROR, nullptr, {},
"Initial binary is invalid; stopping.");
return false;
}
// Build the module from the input binary.
std::unique_ptr<opt::IRContext> ir_context = BuildModule(
target_env, message_consumer, binary_in.data(), binary_in.size());
assert(ir_context);
// Set up a fact manager with any given initial facts.
FactManager fact_manager;
for (auto& fact : initial_facts.fact()) {
fact_manager.AddFact(fact, ir_context.get());
}
TransformationContext transformation_context(&fact_manager,
validator_options);
auto entry_point_function =
FindFragmentShaderEntryPoint(ir_context.get(), message_consumer);
auto output_variable =
FindVec4OutputVariable(ir_context.get(), message_consumer);
if (entry_point_function == nullptr || output_variable == nullptr) {
return false;
}
opt::analysis::Float temp_float_type(32);
opt::analysis::Float* float_type = ir_context->get_type_mgr()
->GetRegisteredType(&temp_float_type)
->AsFloat();
std::pair<uint32_t, uint32_t> zero_one_float_ids =
FindOrCreateFloatZeroAndOne(ir_context.get(), float_type);
// Make the new exit block
auto new_exit_block_id = ir_context->TakeNextId();
{
auto label = MakeUnique<opt::Instruction>(ir_context.get(), SpvOpLabel, 0,
new_exit_block_id,
opt::Instruction::OperandList());
auto new_exit_block = MakeUnique<opt::BasicBlock>(std::move(label));
new_exit_block->AddInstruction(MakeUnique<opt::Instruction>(
ir_context.get(), SpvOpReturn, 0, 0, opt::Instruction::OperandList()));
entry_point_function->AddBasicBlock(std::move(new_exit_block));
}
// Make the new entry block
{
auto label = MakeUnique<opt::Instruction>(ir_context.get(), SpvOpLabel, 0,
ir_context->TakeNextId(),
opt::Instruction::OperandList());
auto new_entry_block = MakeUnique<opt::BasicBlock>(std::move(label));
// Make an instruction to construct vec4(1.0, 0.0, 0.0, 1.0), representing
// the colour red.
opt::Operand zero_float = {SPV_OPERAND_TYPE_ID, {zero_one_float_ids.first}};
opt::Operand one_float = {SPV_OPERAND_TYPE_ID, {zero_one_float_ids.second}};
opt::Instruction::OperandList op_composite_construct_operands = {
one_float, zero_float, zero_float, one_float};
auto temp_vec4 = opt::analysis::Vector(float_type, 4);
auto vec4_id = ir_context->get_type_mgr()->GetId(&temp_vec4);
auto red = MakeUnique<opt::Instruction>(
ir_context.get(), SpvOpCompositeConstruct, vec4_id,
ir_context->TakeNextId(), op_composite_construct_operands);
auto red_id = red->result_id();
new_entry_block->AddInstruction(std::move(red));
// Make an instruction to store red into the output color.
opt::Operand variable_to_store_into = {SPV_OPERAND_TYPE_ID,
{output_variable->result_id()}};
opt::Operand value_to_be_stored = {SPV_OPERAND_TYPE_ID, {red_id}};
opt::Instruction::OperandList op_store_operands = {variable_to_store_into,
value_to_be_stored};
new_entry_block->AddInstruction(MakeUnique<opt::Instruction>(
ir_context.get(), SpvOpStore, 0, 0, op_store_operands));
// We are going to attempt to construct 'false' as an expression of the form
// 'literal1 > literal2'. If we succeed, we will later replace each literal
// with a uniform of the same value - we can only do that replacement once
// we have added the entry block to the module.
std::unique_ptr<TransformationReplaceConstantWithUniform>
first_greater_then_operand_replacement = nullptr;
std::unique_ptr<TransformationReplaceConstantWithUniform>
second_greater_then_operand_replacement = nullptr;
uint32_t id_guaranteed_to_be_false = 0;
opt::analysis::Bool temp_bool_type;
opt::analysis::Bool* registered_bool_type =
ir_context->get_type_mgr()
->GetRegisteredType(&temp_bool_type)
->AsBool();
auto float_type_id = ir_context->get_type_mgr()->GetId(float_type);
auto types_for_which_uniforms_are_known =
fact_manager.GetTypesForWhichUniformValuesAreKnown();
// Check whether we have any float uniforms.
if (std::find(types_for_which_uniforms_are_known.begin(),
types_for_which_uniforms_are_known.end(),
float_type_id) != types_for_which_uniforms_are_known.end()) {
// We have at least one float uniform; let's see whether we have at least
// two.
auto available_constants =
fact_manager.GetConstantsAvailableFromUniformsForType(
ir_context.get(), float_type_id);
if (available_constants.size() > 1) {
// Grab the float constants associated with the first two known float
// uniforms.
auto first_constant =
ir_context->get_constant_mgr()
->GetConstantFromInst(ir_context->get_def_use_mgr()->GetDef(
available_constants[0]))
->AsFloatConstant();
auto second_constant =
ir_context->get_constant_mgr()
->GetConstantFromInst(ir_context->get_def_use_mgr()->GetDef(
available_constants[1]))
->AsFloatConstant();
// Now work out which of the two constants is larger than the other.
uint32_t larger_constant_index = 0;
uint32_t smaller_constant_index = 0;
if (first_constant->GetFloat() > second_constant->GetFloat()) {
larger_constant_index = 0;
smaller_constant_index = 1;
} else if (first_constant->GetFloat() < second_constant->GetFloat()) {
larger_constant_index = 1;
smaller_constant_index = 0;
}
// Only proceed with these constants if they have turned out to be
// distinct.
if (larger_constant_index != smaller_constant_index) {
// We are in a position to create 'false' as 'literal1 > literal2', so
// reserve an id for this computation; this id will end up being
// guaranteed to be 'false'.
id_guaranteed_to_be_false = ir_context->TakeNextId();
auto smaller_constant = available_constants[smaller_constant_index];
auto larger_constant = available_constants[larger_constant_index];
opt::Instruction::OperandList greater_than_operands = {
{SPV_OPERAND_TYPE_ID, {smaller_constant}},
{SPV_OPERAND_TYPE_ID, {larger_constant}}};
new_entry_block->AddInstruction(MakeUnique<opt::Instruction>(
ir_context.get(), SpvOpFOrdGreaterThan,
ir_context->get_type_mgr()->GetId(registered_bool_type),
id_guaranteed_to_be_false, greater_than_operands));
first_greater_then_operand_replacement =
MakeConstantUniformReplacement(ir_context.get(), fact_manager,
smaller_constant,
id_guaranteed_to_be_false, 0);
second_greater_then_operand_replacement =
MakeConstantUniformReplacement(ir_context.get(), fact_manager,
larger_constant,
id_guaranteed_to_be_false, 1);
}
}
}
if (id_guaranteed_to_be_false == 0) {
auto constant_false = ir_context->get_constant_mgr()->RegisterConstant(
MakeUnique<opt::analysis::BoolConstant>(registered_bool_type, false));
id_guaranteed_to_be_false = ir_context->get_constant_mgr()
->GetDefiningInstruction(constant_false)
->result_id();
}
opt::Operand false_condition = {SPV_OPERAND_TYPE_ID,
{id_guaranteed_to_be_false}};
opt::Operand then_block = {SPV_OPERAND_TYPE_ID,
{entry_point_function->entry()->id()}};
opt::Operand else_block = {SPV_OPERAND_TYPE_ID, {new_exit_block_id}};
opt::Instruction::OperandList op_branch_conditional_operands = {
false_condition, then_block, else_block};
new_entry_block->AddInstruction(
MakeUnique<opt::Instruction>(ir_context.get(), SpvOpBranchConditional,
0, 0, op_branch_conditional_operands));
entry_point_function->InsertBasicBlockBefore(
std::move(new_entry_block), entry_point_function->entry().get());
for (auto& replacement : {first_greater_then_operand_replacement.get(),
second_greater_then_operand_replacement.get()}) {
if (replacement) {
assert(replacement->IsApplicable(ir_context.get(),
transformation_context));
replacement->Apply(ir_context.get(), &transformation_context);
}
}
}
// Write out the module as a binary.
ir_context->module()->ToBinary(binary_out, false);
return true;
}
} // namespace fuzz
} // namespace spvtools
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