glasm: Add GLASM backend infrastructure

src/shader_recompiler/backend/glasm/emit_glasm.cpp

@@ -0,0 +1,95 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <string>
+#include <tuple>
+
+#include "shader_recompiler/backend/bindings.h"
+#include "shader_recompiler/backend/glasm/emit_context.h"
+#include "shader_recompiler/backend/glasm/emit_glasm.h"
+#include "shader_recompiler/backend/glasm/emit_glasm_instructions.h"
+#include "shader_recompiler/frontend/ir/program.h"
+#include "shader_recompiler/profile.h"
+
+namespace Shader::Backend::GLASM {
+namespace {
+template <class Func>
+struct FuncTraits {};
+
+template <class ReturnType_, class... Args>
+struct FuncTraits<ReturnType_ (*)(Args...)> {
+    using ReturnType = ReturnType_;
+
+    static constexpr size_t NUM_ARGS = sizeof...(Args);
+
+    template <size_t I>
+    using ArgType = std::tuple_element_t<I, std::tuple<Args...>>;
+};
+
+template <typename ArgType>
+auto Arg(EmitContext& ctx, const IR::Value& arg) {
+    if constexpr (std::is_same_v<ArgType, std::string_view>) {
+        return ctx.reg_alloc.Consume(arg);
+    } else if constexpr (std::is_same_v<ArgType, const IR::Value&>) {
+        return arg;
+    } else if constexpr (std::is_same_v<ArgType, u32>) {
+        return arg.U32();
+    } else if constexpr (std::is_same_v<ArgType, IR::Block*>) {
+        return arg.Label();
+    } else if constexpr (std::is_same_v<ArgType, IR::Attribute>) {
+        return arg.Attribute();
+    } else if constexpr (std::is_same_v<ArgType, IR::Patch>) {
+        return arg.Patch();
+    } else if constexpr (std::is_same_v<ArgType, IR::Reg>) {
+        return arg.Reg();
+    }
+}
+
+template <auto func, bool is_first_arg_inst, size_t... I>
+void Invoke(EmitContext& ctx, IR::Inst* inst, std::index_sequence<I...>) {
+    using Traits = FuncTraits<decltype(func)>;
+    if constexpr (is_first_arg_inst) {
+        func(ctx, inst, Arg<typename Traits::template ArgType<I + 2>>(ctx, inst->Arg(I))...);
+    } else {
+        func(ctx, Arg<typename Traits::template ArgType<I + 1>>(ctx, inst->Arg(I))...);
+    }
+}
+
+template <auto func>
+void Invoke(EmitContext& ctx, IR::Inst* inst) {
+    using Traits = FuncTraits<decltype(func)>;
+    static_assert(Traits::NUM_ARGS >= 1, "Insufficient arguments");
+    if constexpr (Traits::NUM_ARGS == 1) {
+        Invoke<func, false>(ctx, inst, std::make_index_sequence<0>{});
+    } else {
+        using FirstArgType = typename Traits::template ArgType<1>;
+        static constexpr bool is_first_arg_inst = std::is_same_v<FirstArgType, IR::Inst*>;
+        using Indices = std::make_index_sequence<Traits::NUM_ARGS - (is_first_arg_inst ? 2 : 1)>;
+        Invoke<func, is_first_arg_inst>(ctx, inst, Indices{});
+    }
+}
+
+void EmitInst(EmitContext& ctx, IR::Inst* inst) {
+    switch (inst->GetOpcode()) {
+#define OPCODE(name, result_type, ...)                                                             \
+    case IR::Opcode::name:                                                                         \
+        return Invoke<&Emit##name>(ctx, inst);
+#include "shader_recompiler/frontend/ir/opcodes.inc"
+#undef OPCODE
+    }
+    throw LogicError("Invalid opcode {}", inst->GetOpcode());
+}
+} // Anonymous namespace
+
+std::string EmitGLASM(const Profile&, IR::Program& program, Bindings&) {
+    EmitContext ctx;
+    for (IR::Block* const block : program.blocks) {
+        for (IR::Inst& inst : block->Instructions()) {
+            EmitInst(ctx, &inst);
+        }
+    }
+    return ctx.code;
+}
+
+} // namespace Shader::Backend::GLASM