Method sendCallMetadata

src/e9tool/e9metadata.cpp:2146–2283

* Send a "call" trampoline metadata. */

 * Send a "call" trampoline metadata.
 */
void e9tool::sendCallMetadata(FILE *out, const char *name, const ELF *elf,
    const Call &call, const std::vector<Argument> &args,
    intptr_t id, const std::vector<Instr> &Is, size_t i, const InstrInfo *I)
{
    // Load arguments.
    bool sysv = true;
    switch (elf->type)
    {
        case BINARY_TYPE_PE_EXE: case BINARY_TYPE_PE_DLL:
            sysv = false;
            break;
        default:
            break;
    }

    name++;
    sendDefinitionHeader(out, name, "ARGS");
    int argno = 0;
    bool before = (call.pos == POS_BEFORE);
    bool pic = (getELFType(elf) != BINARY_TYPE_ELF_EXE);
    CallInfo info(sysv, (call.abi == ABI_CLEAN), call.state,
        (call.jmp != JUMP_NONE), args.size(), before, pic);
    TypeSig sig = TYPESIG_EMPTY;
    if (args.size() != call.nargs)
        error("failed to emit call metadata; expected %zu arguments, "
            "found %zu", call.nargs, args.size());
    size_t j = 0;
    for (const auto &arg: args)
    {
        j++;
        int regno = getArgRegIdx(sysv, argno);
        Type t = sendLoadArgumentMetadata(out, info, elf, name, call.pos, Is,
            i, I, id, arg, argno, regno);
        sig = setType(sig, t, argno);
        argno++;
    }
    argno = 0;
    int32_t rsp_args_offset = 0;
    for (int argno = (int)args.size()-1; argno >= 0; argno--)
    {
        // Send stack arguments:
        int regno = getArgRegIdx(sysv, argno);
        switch (regno)
        {
            case R10_IDX: case R11_IDX:
                sendPush(out, info.rsp_offset, before, getReg(regno));
                rsp_args_offset += sizeof(int64_t);
                break;
        }
    }
    for (int regno = 0; call.abi == ABI_NAKED && regno < RMAX_IDX; regno++)
    {
        Register reg = getReg(regno);
        if (!info.isCallerSave(reg) && info.isClobbered(reg))
        {
            // Restore clobbered callee-save register:
            int32_t reg_offset = rsp_args_offset;
            reg_offset += info.getOffset(reg);