SPIRV-Cross/spirv_cross.hpp
2017-03-21 13:48:50 +01:00

614 lines
23 KiB
C++

/*
* Copyright 2015-2017 ARM Limited
*
* 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.
*/
#ifndef SPIRV_CROSS_HPP
#define SPIRV_CROSS_HPP
#include "spirv.hpp"
#include <memory>
#include <stack>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include "spirv_common.hpp"
namespace spirv_cross
{
struct Resource
{
// Resources are identified with their SPIR-V ID.
// This is the ID of the OpVariable.
uint32_t id;
// The type ID of the variable which includes arrays and all type modifications.
// This type ID is not suitable for parsing OpMemberDecoration of a struct and other decorations in general
// since these modifications typically happen on the base_type_id.
uint32_t type_id;
// The base type of the declared resource.
// This type is the base type which ignores pointers and arrays of the type_id.
// This is mostly useful to parse decorations of the underlying type.
// base_type_id can also be obtained with get_type(get_type(type_id).self).
uint32_t base_type_id;
// The declared name (OpName) of the resource.
// For Buffer blocks, the name actually reflects the externally
// visible Block name.
//
// This name can be retrieved again by using either
// get_name(id) or get_name(base_type_id) depending if it's a buffer block or not.
//
// This name can be an empty string in which case get_fallback_name(id) can be
// used which obtains a suitable fallback identifier for an ID.
std::string name;
};
struct ShaderResources
{
std::vector<Resource> uniform_buffers;
std::vector<Resource> storage_buffers;
std::vector<Resource> stage_inputs;
std::vector<Resource> stage_outputs;
std::vector<Resource> subpass_inputs;
std::vector<Resource> storage_images;
std::vector<Resource> sampled_images;
std::vector<Resource> atomic_counters;
// There can only be one push constant block,
// but keep the vector in case this restriction is lifted in the future.
std::vector<Resource> push_constant_buffers;
// For Vulkan GLSL and HLSL source,
// these correspond to separate texture2D and samplers respectively.
std::vector<Resource> separate_images;
std::vector<Resource> separate_samplers;
};
struct CombinedImageSampler
{
// The ID of the sampler2D variable.
uint32_t combined_id;
// The ID of the texture2D variable.
uint32_t image_id;
// The ID of the sampler variable.
uint32_t sampler_id;
};
struct SpecializationConstant
{
// The ID of the specialization constant.
uint32_t id;
// The constant ID of the constant, used in Vulkan during pipeline creation.
uint32_t constant_id;
};
struct BufferRange
{
unsigned index;
size_t offset;
size_t range;
};
class Compiler
{
public:
friend class CFG;
friend class DominatorBuilder;
// The constructor takes a buffer of SPIR-V words and parses it.
Compiler(std::vector<uint32_t> ir);
virtual ~Compiler() = default;
// After parsing, API users can modify the SPIR-V via reflection and call this
// to disassemble the SPIR-V into the desired langauage.
// Sub-classes actually implement this.
virtual std::string compile();
// Gets the identifier (OpName) of an ID. If not defined, an empty string will be returned.
const std::string &get_name(uint32_t id) const;
// Applies a decoration to an ID. Effectively injects OpDecorate.
void set_decoration(uint32_t id, spv::Decoration decoration, uint32_t argument = 0);
// Overrides the identifier OpName of an ID.
// Identifiers beginning with underscores or identifiers which contain double underscores
// are reserved by the implementation.
void set_name(uint32_t id, const std::string &name);
// Gets a bitmask for the decorations which are applied to ID.
// I.e. (1ull << spv::DecorationFoo) | (1ull << spv::DecorationBar)
uint64_t get_decoration_mask(uint32_t id) const;
// Returns whether the decoration has been applied to the ID.
bool has_decoration(uint32_t id, spv::Decoration decoration) const;
// Gets the value for decorations which take arguments.
// If the decoration is a boolean (i.e. spv::DecorationNonWritable),
// 1 will be returned.
// If decoration doesn't exist or decoration is not recognized,
// 0 will be returned.
uint32_t get_decoration(uint32_t id, spv::Decoration decoration) const;
// Removes the decoration for a an ID.
void unset_decoration(uint32_t id, spv::Decoration decoration);
// Gets the SPIR-V associated with ID.
// Mostly used with Resource::type_id and Resource::base_type_id to parse the underlying type of a resource.
const SPIRType &get_type(uint32_t id) const;
const SPIRType &get_type_from_variable(uint32_t id) const;
// Gets the underlying storage class for an OpVariable.
spv::StorageClass get_storage_class(uint32_t id) const;
// If get_name() is an empty string, get the fallback name which will be used
// instead in the disassembled source.
virtual const std::string get_fallback_name(uint32_t id) const
{
return join("_", id);
}
// Given an OpTypeStruct in ID, obtain the identifier for member number "index".
// This may be an empty string.
const std::string &get_member_name(uint32_t id, uint32_t index) const;
// Given an OpTypeStruct in ID, obtain the OpMemberDecoration for member number "index".
uint32_t get_member_decoration(uint32_t id, uint32_t index, spv::Decoration decoration) const;
// Sets the member identifier for OpTypeStruct ID, member number "index".
void set_member_name(uint32_t id, uint32_t index, const std::string &name);
// Sets the qualified member identifier for OpTypeStruct ID, member number "index".
void set_member_qualified_name(uint32_t id, uint32_t index, const std::string &name);
// Gets the decoration mask for a member of a struct, similar to get_decoration_mask.
uint64_t get_member_decoration_mask(uint32_t id, uint32_t index) const;
// Returns whether the decoration has been applied to a member of a struct.
bool has_member_decoration(uint32_t id, uint32_t index, spv::Decoration decoration) const;
// Similar to set_decoration, but for struct members.
void set_member_decoration(uint32_t id, uint32_t index, spv::Decoration decoration, uint32_t argument = 0);
// Unsets a member decoration, similar to unset_decoration.
void unset_member_decoration(uint32_t id, uint32_t index, spv::Decoration decoration);
// Gets the fallback name for a member, similar to get_fallback_name.
virtual const std::string get_fallback_member_name(uint32_t index) const
{
return join("_", index);
}
// Returns a vector of which members of a struct are potentially in use by a
// SPIR-V shader. The granularity of this analysis is per-member of a struct.
// This can be used for Buffer (UBO), BufferBlock (SSBO) and PushConstant blocks.
// ID is the Resource::id obtained from get_shader_resources().
std::vector<BufferRange> get_active_buffer_ranges(uint32_t id) const;
// Returns the effective size of a buffer block.
size_t get_declared_struct_size(const SPIRType &struct_type) const;
// Returns the effective size of a buffer block struct member.
virtual size_t get_declared_struct_member_size(const SPIRType &struct_type, uint32_t index) const;
// Legacy GLSL compatibility method. Deprecated in favor of CompilerGLSL::flatten_buffer_block
SPIRV_CROSS_DEPRECATED("Please use flatten_buffer_block instead.") void flatten_interface_block(uint32_t id);
// Returns a set of all global variables which are statically accessed
// by the control flow graph from the current entry point.
// Only variables which change the interface for a shader are returned, that is,
// variables with storage class of Input, Output, Uniform, UniformConstant, PushConstant and AtomicCounter
// storage classes are returned.
//
// To use the returned set as the filter for which variables are used during compilation,
// this set can be moved to set_enabled_interface_variables().
std::unordered_set<uint32_t> get_active_interface_variables() const;
// Sets the interface variables which are used during compilation.
// By default, all variables are used.
// Once set, compile() will only consider the set in active_variables.
void set_enabled_interface_variables(std::unordered_set<uint32_t> active_variables);
// Query shader resources, use ids with reflection interface to modify or query binding points, etc.
ShaderResources get_shader_resources() const;
// Query shader resources, but only return the variables which are part of active_variables.
// E.g.: get_shader_resources(get_active_variables()) to only return the variables which are statically
// accessed.
ShaderResources get_shader_resources(const std::unordered_set<uint32_t> &active_variables) const;
// Remapped variables are considered built-in variables and a backend will
// not emit a declaration for this variable.
// This is mostly useful for making use of builtins which are dependent on extensions.
void set_remapped_variable_state(uint32_t id, bool remap_enable);
bool get_remapped_variable_state(uint32_t id) const;
// For subpassInput variables which are remapped to plain variables,
// the number of components in the remapped
// variable must be specified as the backing type of subpass inputs are opaque.
void set_subpass_input_remapped_components(uint32_t id, uint32_t components);
uint32_t get_subpass_input_remapped_components(uint32_t id) const;
// All operations work on the current entry point.
// Entry points can be swapped out with set_entry_point().
// Entry points should be set right after the constructor completes as some reflection functions traverse the graph from the entry point.
// Resource reflection also depends on the entry point.
// By default, the current entry point is set to the first OpEntryPoint which appears in the SPIR-V module.
std::vector<std::string> get_entry_points() const;
void set_entry_point(const std::string &name);
// Returns the internal data structure for entry points to allow poking around.
const SPIREntryPoint &get_entry_point(const std::string &name) const;
SPIREntryPoint &get_entry_point(const std::string &name);
// Query and modify OpExecutionMode.
uint64_t get_execution_mode_mask() const;
void unset_execution_mode(spv::ExecutionMode mode);
void set_execution_mode(spv::ExecutionMode mode, uint32_t arg0 = 0, uint32_t arg1 = 0, uint32_t arg2 = 0);
// Gets argument for an execution mode (LocalSize, Invocations, OutputVertices).
// For LocalSize, the index argument is used to select the dimension (X = 0, Y = 1, Z = 2).
// For execution modes which do not have arguments, 0 is returned.
uint32_t get_execution_mode_argument(spv::ExecutionMode mode, uint32_t index = 0) const;
spv::ExecutionModel get_execution_model() const;
// Analyzes all separate image and samplers used from the currently selected entry point,
// and re-routes them all to a combined image sampler instead.
// This is required to "support" separate image samplers in targets which do not natively support
// this feature, like GLSL/ESSL.
//
// This must be called before compile() if such remapping is desired.
// This call will add new sampled images to the SPIR-V,
// so it will appear in reflection if get_shader_resources() is called after build_combined_image_samplers.
//
// If any image/sampler remapping was found, no separate image/samplers will appear in the decompiled output,
// but will still appear in reflection.
//
// The resulting samplers will be void of any decorations like name, descriptor sets and binding points,
// so this can be added before compile() if desired.
//
// Combined image samplers originating from this set are always considered active variables.
void build_combined_image_samplers();
// Gets a remapping for the combined image samplers.
const std::vector<CombinedImageSampler> &get_combined_image_samplers() const
{
return combined_image_samplers;
}
// Set a new variable type remap callback.
// The type remapping is designed to allow global interface variable to assume more special types.
// A typical example here is to remap sampler2D into samplerExternalOES, which currently isn't supported
// directly by SPIR-V.
//
// In compile() while emitting code,
// for every variable that is declared, including function parameters, the callback will be called
// and the API user has a chance to change the textual representation of the type used to declare the variable.
// The API user can detect special patterns in names to guide the remapping.
void set_variable_type_remap_callback(VariableTypeRemapCallback cb)
{
variable_remap_callback = std::move(cb);
}
// API for querying which specialization constants exist.
// To modify a specialization constant before compile(), use get_constant(constant.id),
// then update constants directly in the SPIRConstant data structure.
// For composite types, the subconstants can be iterated over and modified.
// constant_type is the SPIRType for the specialization constant,
// which can be queried to determine which fields in the unions should be poked at.
std::vector<SpecializationConstant> get_specialization_constants() const;
SPIRConstant &get_constant(uint32_t id);
const SPIRConstant &get_constant(uint32_t id) const;
uint32_t get_current_id_bound() const
{
return uint32_t(ids.size());
}
protected:
const uint32_t *stream(const Instruction &instr) const
{
// If we're not going to use any arguments, just return nullptr.
// We want to avoid case where we return an out of range pointer
// that trips debug assertions on some platforms.
if (!instr.length)
return nullptr;
if (instr.offset + instr.length > spirv.size())
SPIRV_CROSS_THROW("Compiler::stream() out of range.");
return &spirv[instr.offset];
}
std::vector<uint32_t> spirv;
std::vector<Instruction> inst;
std::vector<Variant> ids;
std::vector<Meta> meta;
SPIRFunction *current_function = nullptr;
SPIRBlock *current_block = nullptr;
std::vector<uint32_t> global_variables;
std::vector<uint32_t> aliased_variables;
std::unordered_set<uint32_t> active_interface_variables;
bool check_active_interface_variables = false;
// If our IDs are out of range here as part of opcodes, throw instead of
// undefined behavior.
template <typename T, typename... P>
T &set(uint32_t id, P &&... args)
{
auto &var = variant_set<T>(ids.at(id), std::forward<P>(args)...);
var.self = id;
return var;
}
template <typename T>
T &get(uint32_t id)
{
return variant_get<T>(ids.at(id));
}
template <typename T>
T *maybe_get(uint32_t id)
{
if (ids.at(id).get_type() == T::type)
return &get<T>(id);
else
return nullptr;
}
template <typename T>
const T &get(uint32_t id) const
{
return variant_get<T>(ids.at(id));
}
template <typename T>
const T *maybe_get(uint32_t id) const
{
if (ids.at(id).get_type() == T::type)
return &get<T>(id);
else
return nullptr;
}
uint32_t entry_point = 0;
// Normally, we'd stick SPIREntryPoint in ids array, but it conflicts with SPIRFunction.
// Entry points can therefore be seen as some sort of meta structure.
std::unordered_map<uint32_t, SPIREntryPoint> entry_points;
const SPIREntryPoint &get_entry_point() const;
SPIREntryPoint &get_entry_point();
struct Source
{
uint32_t version = 0;
bool es = false;
bool known = false;
Source() = default;
} source;
std::unordered_set<uint32_t> loop_blocks;
std::unordered_set<uint32_t> continue_blocks;
std::unordered_set<uint32_t> loop_merge_targets;
std::unordered_set<uint32_t> selection_merge_targets;
std::unordered_set<uint32_t> multiselect_merge_targets;
virtual std::string to_name(uint32_t id, bool allow_alias = true) const;
bool is_builtin_variable(const SPIRVariable &var) const;
bool is_hidden_variable(const SPIRVariable &var, bool include_builtins = false) const;
bool is_immutable(uint32_t id) const;
bool is_member_builtin(const SPIRType &type, uint32_t index, spv::BuiltIn *builtin) const;
bool is_scalar(const SPIRType &type) const;
bool is_vector(const SPIRType &type) const;
bool is_matrix(const SPIRType &type) const;
const SPIRType &expression_type(uint32_t id) const;
bool expression_is_lvalue(uint32_t id) const;
bool variable_storage_is_aliased(const SPIRVariable &var);
SPIRVariable *maybe_get_backing_variable(uint32_t chain);
void register_read(uint32_t expr, uint32_t chain, bool forwarded);
void register_write(uint32_t chain);
inline bool is_continue(uint32_t next) const
{
return continue_blocks.find(next) != end(continue_blocks);
}
inline bool is_break(uint32_t next) const
{
return loop_merge_targets.find(next) != end(loop_merge_targets) ||
multiselect_merge_targets.find(next) != end(multiselect_merge_targets);
}
inline bool is_conditional(uint32_t next) const
{
return selection_merge_targets.find(next) != end(selection_merge_targets) &&
multiselect_merge_targets.find(next) == end(multiselect_merge_targets);
}
// Dependency tracking for temporaries read from variables.
void flush_dependees(SPIRVariable &var);
void flush_all_active_variables();
void flush_all_atomic_capable_variables();
void flush_all_aliased_variables();
void register_global_read_dependencies(const SPIRBlock &func, uint32_t id);
void register_global_read_dependencies(const SPIRFunction &func, uint32_t id);
std::unordered_set<uint32_t> invalid_expressions;
void update_name_cache(std::unordered_set<std::string> &cache, std::string &name);
bool function_is_pure(const SPIRFunction &func);
bool block_is_pure(const SPIRBlock &block);
bool block_is_outside_flow_control_from_block(const SPIRBlock &from, const SPIRBlock &to);
bool execution_is_branchless(const SPIRBlock &from, const SPIRBlock &to) const;
bool execution_is_noop(const SPIRBlock &from, const SPIRBlock &to) const;
SPIRBlock::ContinueBlockType continue_block_type(const SPIRBlock &continue_block) const;
bool force_recompile = false;
uint32_t type_struct_member_offset(const SPIRType &type, uint32_t index) const;
uint32_t type_struct_member_array_stride(const SPIRType &type, uint32_t index) const;
uint32_t type_struct_member_matrix_stride(const SPIRType &type, uint32_t index) const;
bool block_is_loop_candidate(const SPIRBlock &block, SPIRBlock::Method method) const;
uint32_t increase_bound_by(uint32_t incr_amount);
bool types_are_logically_equivalent(const SPIRType &a, const SPIRType &b) const;
void inherit_expression_dependencies(uint32_t dst, uint32_t source);
// For proper multiple entry point support, allow querying if an Input or Output
// variable is part of that entry points interface.
bool interface_variable_exists_in_entry_point(uint32_t id) const;
std::vector<CombinedImageSampler> combined_image_samplers;
void remap_variable_type_name(const SPIRType &type, const std::string &var_name, std::string &type_name) const
{
if (variable_remap_callback)
variable_remap_callback(type, var_name, type_name);
}
void analyze_variable_scope(SPIRFunction &function);
protected:
void parse();
void parse(const Instruction &i);
// Used internally to implement various traversals for queries.
struct OpcodeHandler
{
virtual ~OpcodeHandler() = default;
// Return true if traversal should continue.
// If false, traversal will end immediately.
virtual bool handle(spv::Op opcode, const uint32_t *args, uint32_t length) = 0;
virtual bool follow_function_call(const SPIRFunction &)
{
return true;
}
virtual void set_current_block(const SPIRBlock &)
{
}
virtual bool begin_function_scope(const uint32_t *, uint32_t)
{
return true;
}
virtual bool end_function_scope(const uint32_t *, uint32_t)
{
return true;
}
};
struct BufferAccessHandler : OpcodeHandler
{
BufferAccessHandler(const Compiler &compiler_, std::vector<BufferRange> &ranges_, uint32_t id_)
: compiler(compiler_)
, ranges(ranges_)
, id(id_)
{
}
bool handle(spv::Op opcode, const uint32_t *args, uint32_t length) override;
const Compiler &compiler;
std::vector<BufferRange> &ranges;
uint32_t id;
std::unordered_set<uint32_t> seen;
};
struct InterfaceVariableAccessHandler : OpcodeHandler
{
InterfaceVariableAccessHandler(const Compiler &compiler_, std::unordered_set<uint32_t> &variables_)
: compiler(compiler_)
, variables(variables_)
{
}
bool handle(spv::Op opcode, const uint32_t *args, uint32_t length) override;
const Compiler &compiler;
std::unordered_set<uint32_t> &variables;
};
struct CombinedImageSamplerHandler : OpcodeHandler
{
CombinedImageSamplerHandler(Compiler &compiler_)
: compiler(compiler_)
{
}
bool handle(spv::Op opcode, const uint32_t *args, uint32_t length) override;
bool begin_function_scope(const uint32_t *args, uint32_t length) override;
bool end_function_scope(const uint32_t *args, uint32_t length) override;
Compiler &compiler;
// Each function in the call stack needs its own remapping for parameters so we can deduce which global variable each texture/sampler the parameter is statically bound to.
std::stack<std::unordered_map<uint32_t, uint32_t>> parameter_remapping;
std::stack<SPIRFunction *> functions;
uint32_t remap_parameter(uint32_t id);
void push_remap_parameters(const SPIRFunction &func, const uint32_t *args, uint32_t length);
void pop_remap_parameters();
void register_combined_image_sampler(SPIRFunction &caller, uint32_t texture_id, uint32_t sampler_id);
};
struct ActiveBuiltinHandler : OpcodeHandler
{
ActiveBuiltinHandler(Compiler &compiler_)
: compiler(compiler_)
{
}
bool handle(spv::Op opcode, const uint32_t *args, uint32_t length) override;
Compiler &compiler;
};
bool traverse_all_reachable_opcodes(const SPIRBlock &block, OpcodeHandler &handler) const;
bool traverse_all_reachable_opcodes(const SPIRFunction &block, OpcodeHandler &handler) const;
// This must be an ordered data structure so we always pick the same type aliases.
std::vector<uint32_t> global_struct_cache;
ShaderResources get_shader_resources(const std::unordered_set<uint32_t> *active_variables) const;
VariableTypeRemapCallback variable_remap_callback;
uint64_t get_buffer_block_flags(const SPIRVariable &var);
bool get_common_basic_type(const SPIRType &type, SPIRType::BaseType &base_type);
std::unordered_set<uint32_t> forced_temporaries;
std::unordered_set<uint32_t> forwarded_temporaries;
uint64_t active_input_builtins = 0;
uint64_t active_output_builtins = 0;
// Traverses all reachable opcodes and sets active_builtins to a bitmask of all builtin variables which are accessed in the shader.
void update_active_builtins();
};
}
#endif