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gl_shader_decompiler: return error on decompilation failure

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Internally these errors are handled by exceptions. Only fallbackable errors (that can be handled by CPU shader emulation) is reported. Completely ill-formed shader is still ASSERTed. Code logic related stuff is DEBUG_ASSERTed
This commit is contained in:
wwylele 2018-03-25 16:08:27 +03:00
parent 4991b15ee5
commit 11c2f11872
2 changed files with 36 additions and 15 deletions
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42
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
View file

@ -2,6 +2,7 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <exception>
#include <set>
#include <string>
#include <nihstro/shader_bytecode.h>
@ -21,6 +22,11 @@ using nihstro::SwizzlePattern;
constexpr u32 PROGRAM_END = MAX_PROGRAM_CODE_LENGTH;
class DecompileFail : public std::runtime_error {
public:
using std::runtime_error::runtime_error;
};
/// Describes the behaviour of code path of a given entry point and a return point.
enum class ExitMethod {
Undetermined, ///< Internal value. Only occur when analyzing JMP loop.
@ -54,7 +60,8 @@ public:
// Recursively finds all subroutines.
const Subroutine& program_main = AddSubroutine(main_offset, PROGRAM_END);
ASSERT(program_main.exit_method == ExitMethod::AlwaysEnd);
if (program_main.exit_method != ExitMethod::AlwaysEnd)
throw DecompileFail("Program does not always end");
}
std::set<Subroutine> GetSubroutines() {
@ -74,6 +81,8 @@ private:
Subroutine subroutine{begin, end};
subroutine.exit_method = Scan(begin, end, subroutine.labels);
if (subroutine.exit_method == ExitMethod::Undetermined)
throw DecompileFail("Recursive function detected");
return *subroutines.insert(std::move(subroutine)).first;
}
@ -187,7 +196,7 @@ private:
class ShaderWriter {
public:
void AddLine(const std::string& text) {
ASSERT(scope >= 0);
DEBUG_ASSERT(scope >= 0);
if (!text.empty()) {
shader_source += std::string(static_cast<size_t>(scope) * 4, ' ');
}
@ -377,7 +386,7 @@ private:
if (reg.empty() || dest_mask_num_components == 0) {
return;
}
ASSERT(value_num_components >= dest_num_components || value_num_components == 1);
DEBUG_ASSERT(value_num_components >= dest_num_components || value_num_components == 1);
std::string dest = reg + (dest_num_components != 1 ? dest_mask_swizzle : "");
@ -560,7 +569,7 @@ private:
LOG_ERROR(HW_GPU, "Unhandled arithmetic instruction: 0x%02x (%s): 0x%08x",
(int)instr.opcode.Value().EffectiveOpCode(),
instr.opcode.Value().GetInfo().name, instr.hex);
DEBUG_ASSERT(false);
throw DecompileFail("Unhandled instruction");
break;
}
}
@ -604,6 +613,7 @@ private:
LOG_ERROR(HW_GPU, "Unhandled multiply-add instruction: 0x%02x (%s): 0x%08x",
(int)instr.opcode.Value().EffectiveOpCode(),
instr.opcode.Value().GetInfo().name, instr.hex);
throw DecompileFail("Unhandled instruction");
}
break;
}
@ -757,6 +767,7 @@ private:
LOG_ERROR(HW_GPU, "Unhandled instruction: 0x%02x (%s): 0x%08x",
(int)instr.opcode.Value().EffectiveOpCode(),
instr.opcode.Value().GetInfo().name, instr.hex);
throw DecompileFail("Unhandled instruction");
break;
}
}
@ -862,7 +873,7 @@ private:
--shader.scope;
shader.AddLine("}\n");
ASSERT(shader.scope == 0);
DEBUG_ASSERT(shader.scope == 0);
}
}
@ -892,14 +903,21 @@ bool exec_shader();
)";
}
std::string DecompileProgram(const ProgramCode& program_code, const SwizzleData& swizzle_data,
u32 main_offset, const RegGetter& inputreg_getter,
const RegGetter& outputreg_getter, bool sanitize_mul, bool is_gs) {
boost::optional<std::string> DecompileProgram(const ProgramCode& program_code,
const SwizzleData& swizzle_data, u32 main_offset,
const RegGetter& inputreg_getter,
const RegGetter& outputreg_getter, bool sanitize_mul,
bool is_gs) {
auto subroutines = ControlFlowAnalyzer(program_code, main_offset).GetSubroutines();
GLSLGenerator generator(subroutines, program_code, swizzle_data, main_offset, inputreg_getter,
outputreg_getter, sanitize_mul, is_gs);
return generator.GetShaderCode();
try {
auto subroutines = ControlFlowAnalyzer(program_code, main_offset).GetSubroutines();
GLSLGenerator generator(subroutines, program_code, swizzle_data, main_offset,
inputreg_getter, outputreg_getter, sanitize_mul, is_gs);
return generator.GetShaderCode();
} catch (const DecompileFail& exception) {
LOG_ERROR(HW_GPU, "Shader decompilation failed: %s", exception.what());
return boost::none;
}
}
} // namespace Decompiler

9
src/video_core/renderer_opengl/gl_shader_decompiler.h
View file

@ -5,6 +5,7 @@
#include <array>
#include <functional>
#include <string>
#include <boost/optional.hpp>
#include "common/common_types.h"
#include "video_core/shader/shader.h"
@ -18,9 +19,11 @@ using RegGetter = std::function<std::string(u32)>;
std::string GetCommonDeclarations();
std::string DecompileProgram(const ProgramCode& program_code, const SwizzleData& swizzle_data,
u32 main_offset, const RegGetter& inputreg_getter,
const RegGetter& outputreg_getter, bool sanitize_mul, bool is_gs);
boost::optional<std::string> DecompileProgram(const ProgramCode& program_code,
const SwizzleData& swizzle_data, u32 main_offset,
const RegGetter& inputreg_getter,
const RegGetter& outputreg_getter, bool sanitize_mul,
bool is_gs);
} // namespace Decompiler
} // namespace Shader