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58 lines
2 KiB
C++
58 lines
2 KiB
C++
#include "CallingConvention.h"
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#include "common/util/Assert.h"
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CallingConvention get_function_calling_convention(const TypeSpec& function_type,
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const TypeSystem& type_system) {
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ASSERT(function_type.base_type() == "function");
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ASSERT(function_type.arg_count() > 0);
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ASSERT(function_type.arg_count() <= 9);
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int gpr_idx = 0;
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int xmm_idx = 0;
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CallingConvention cc;
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if (function_type.arg_count() == 2 && function_type.get_arg(0).print() == "_varargs_") {
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for (int i = 0; i < 8; i++) {
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cc.arg_regs.push_back(emitter::gRegInfo.get_gpr_arg_reg(gpr_idx++));
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}
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} else {
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for (int i = 0; i < (int)function_type.arg_count() - 1; i++) {
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auto info = type_system.lookup_type_allow_partial_def(function_type.get_arg(i));
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auto load_size = type_system.get_load_size_allow_partial_def(function_type.get_arg(i));
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if (dynamic_cast<const ValueType*>(info) && load_size == 16) {
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cc.arg_regs.push_back(emitter::gRegInfo.get_xmm_arg_reg(xmm_idx++));
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} else {
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cc.arg_regs.push_back(emitter::gRegInfo.get_gpr_arg_reg(gpr_idx++));
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}
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}
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}
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if (function_type.last_arg() != TypeSpec("none")) {
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if (type_system.get_load_size_allow_partial_def(function_type.last_arg()) == 16) {
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cc.return_reg = emitter::gRegInfo.get_xmm_ret_reg();
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} else {
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cc.return_reg = emitter::gRegInfo.get_gpr_ret_reg();
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}
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}
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return cc;
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}
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std::vector<emitter::Register> get_arg_registers(const TypeSystem& type_system,
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const std::vector<TypeSpec>& arg_types) {
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std::vector<emitter::Register> result;
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int gpr_idx = 0;
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int xmm_idx = 0;
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for (auto& type : arg_types) {
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auto load_size = type_system.get_load_size_allow_partial_def(type);
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if (load_size == 16) {
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result.push_back(emitter::gRegInfo.get_xmm_arg_reg(xmm_idx++));
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} else {
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result.push_back(emitter::gRegInfo.get_gpr_arg_reg(gpr_idx++));
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}
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}
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return result;
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}
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