xptcstubs_ppc_rhapsody.cpp

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/* -*- Mode: C -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "xptcprivate.h"

/* Under the Mac OS X PowerPC ABI, the first 8 integer and 13 floating point

 * parameters are delivered in registers and are not on the stack, although

 * stack space is allocated for them.  The integer parameters are delivered

 * in GPRs r3 through r10.  The first 8 words of the parameter area on the

 * stack shadow these registers.  A word will either be in a register or on

 * the stack, but not in both.  Although the first floating point parameters

 * are passed in floating point registers, GPR space and stack space is

 * reserved for them as well.

 * SharedStub has passed pointers to the parameter section of the stack

 * and saved copies of the GPRs and FPRs used for parameter passing.  We

 * don't care about the first parameter (which is delivered here as the self

 * pointer), so SharedStub pointed us past that.  argsGPR thus points to GPR

 * r4 (corresponding to the first argument after the self pointer) and

 * argsStack points to the parameter section of the caller's stack frame

 * reserved for the same argument.  This way, it is possible to reference

 * either argsGPR or argsStack with the same index.

 * Contrary to the assumption made by the previous implementation, the

 * Mac OS X PowerPC ABI doesn't impose any special alignment restrictions on

 * parameter sections of stacks.  Values that are 64 bits wide appear on the

 * stack without any special padding.

 * See also xptcstubs_asm_ppc_darwin.s.m4:_SharedStub.

 * ABI reference:

 * http://developer.apple.com/documentation/DeveloperTools/Conceptual/

 *  MachORuntime/PowerPCConventions/chapter_3_section_1.html */

extern "C" nsresult ATTRIBUTE_USED

PrepareAndDispatch(

  nsXPTCStubBase *self,

  uint32_t        methodIndex,

  uint32_t       *argsStack,

  uint32_t       *argsGPR,

  double         *argsFPR) {

#define PARAM_FPR_COUNT    13

#define PARAM_GPR_COUNT     7

  nsXPTCMiniVariant      paramBuffer[PARAM_BUFFER_COUNT];

  const nsXPTMethodInfo *methodInfo;

  uint8_t                paramCount;

  uint8_t                i;

  uint32_t               argIndex       = 0;

  uint32_t               fprIndex       = 0;

  typedef struct {

    uint32_t hi;

    uint32_t lo;

  } DU;

  NS_ASSERTION(self, "no self");

  self->mEntry->GetMethodInfo(uint16_t(methodIndex), &methodInfo);

  NS_ASSERTION(methodInfo, "no method info");

  paramCount = methodInfo->ParamCount();

  for(i = 0; i < paramCount; i++, argIndex++) {

    const nsXPTParamInfo &param = methodInfo->Param(i);

    const nsXPTType      &type  = param.GetType();

    nsXPTCMiniVariant    *dp    = &paramBuffer[i];

    uint32_t              theParam;

    if(argIndex < PARAM_GPR_COUNT)

      theParam =   argsGPR[argIndex];

    else

      theParam = argsStack[argIndex];

    if(param.IsOut() || !type.IsArithmetic())

      dp->val.p = (void *) theParam;

    else {

      switch(type) {

        case nsXPTType::T_I8:

          dp->val.i8  =   (int8_t) theParam;

          break;

        case nsXPTType::T_I16:

          dp->val.i16 =  (int16_t) theParam;

          break;

        case nsXPTType::T_I32:

          dp->val.i32 =  (int32_t) theParam;

          break;

        case nsXPTType::T_U8:

          dp->val.u8  =  (uint8_t) theParam;

          break;

        case nsXPTType::T_U16:

          dp->val.u16 = (uint16_t) theParam;

          break;

        case nsXPTType::T_U32:

          dp->val.u32 = (uint32_t) theParam;

          break;

        case nsXPTType::T_I64:

        case nsXPTType::T_U64:

          ((DU *)dp)->hi = (uint32_t) theParam;

          if(++argIndex < PARAM_GPR_COUNT)

            ((DU *)dp)->lo = (uint32_t)   argsGPR[argIndex];

          else

            ((DU *)dp)->lo = (uint32_t) argsStack[argIndex];

          break;

        case nsXPTType::T_BOOL:

          dp->val.b   =   (bool) theParam;

          break;

        case nsXPTType::T_CHAR:

          dp->val.c   =     (char) theParam;

          break;

        case nsXPTType::T_WCHAR:

          dp->val.wc  =  (wchar_t) theParam;

          break;

        case nsXPTType::T_FLOAT:

          if(fprIndex < PARAM_FPR_COUNT)

            dp->val.f = (float) argsFPR[fprIndex++];

          else

            dp->val.f = *(float *) &argsStack[argIndex];

          break;

        case nsXPTType::T_DOUBLE:

          if(fprIndex < PARAM_FPR_COUNT)

            dp->val.d = argsFPR[fprIndex++];

          else

            dp->val.d = *(double *) &argsStack[argIndex];

          argIndex++;

          break;

        default:

          NS_ERROR("bad type");

          break;

  nsresult result = self->mOuter->

    CallMethod((uint16_t)methodIndex, methodInfo, paramBuffer);

  return result;

#define STUB_ENTRY(n)

#define SENTINEL_ENTRY(n) \

nsresult nsXPTCStubBase::Sentinel##n() \

{ \

    NS_ERROR("nsXPTCStubBase::Sentinel called"); \

    return NS_ERROR_NOT_IMPLEMENTED; \

#include "xptcstubsdef.inc"