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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
/* Implement shared vtbl methods. */
#include "xptcprivate.h"
#include "xptiprivate.h"
/* Prototype specifies unmangled function name and disables unused warning */
static nsresult
PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args)
__asm__("PrepareAndDispatch") ATTRIBUTE_USED;
static nsresult
PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args)
{
const uint8_t PARAM_BUFFER_COUNT = 16;
const uint8_t NUM_ARG_REGS = 6-1; // -1 for "this" pointer
nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
nsXPTCMiniVariant* dispatchParams = nullptr;
const nsXPTMethodInfo* info;
uint8_t paramCount;
uint8_t i;
nsresult result = NS_ERROR_FAILURE;
NS_ASSERTION(self,"no self");
self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
paramCount = info->GetParamCount();
// setup variant array pointer
if(paramCount > PARAM_BUFFER_COUNT)
dispatchParams = new nsXPTCMiniVariant[paramCount];
else
dispatchParams = paramBuffer;
NS_ASSERTION(dispatchParams,"no place for params");
// args[0] to args[NUM_ARG_REGS] hold floating point register values
uint64_t* ap = args + NUM_ARG_REGS;
for(i = 0; i < paramCount; i++, ap++)
{
const nsXPTParamInfo& param = info->GetParam(i);
const nsXPTType& type = param.GetType();
nsXPTCMiniVariant* dp = &dispatchParams[i];
if(param.IsOut() || !type.IsArithmetic())
{
dp->val.p = (void*) *ap;
continue;
}
// else
switch(type)
{
case nsXPTType::T_I8 : dp->val.i8 = (int8_t) *ap; break;
case nsXPTType::T_I16 : dp->val.i16 = (int16_t) *ap; break;
case nsXPTType::T_I32 : dp->val.i32 = (int32_t) *ap; break;
case nsXPTType::T_I64 : dp->val.i64 = (int64_t) *ap; break;
case nsXPTType::T_U8 : dp->val.u8 = (uint8_t) *ap; break;
case nsXPTType::T_U16 : dp->val.u16 = (uint16_t) *ap; break;
case nsXPTType::T_U32 : dp->val.u32 = (uint32_t) *ap; break;
case nsXPTType::T_U64 : dp->val.u64 = (uint64_t) *ap; break;
case nsXPTType::T_FLOAT :
if(i < NUM_ARG_REGS)
{
// floats passed via registers are stored as doubles
// in the first NUM_ARG_REGS entries in args
dp->val.u64 = (uint64_t) args[i];
dp->val.f = (float) dp->val.d; // convert double to float
}
else
dp->val.u32 = (uint32_t) *ap;
break;
case nsXPTType::T_DOUBLE :
// doubles passed via registers are also stored
// in the first NUM_ARG_REGS entries in args
dp->val.u64 = (i < NUM_ARG_REGS) ? args[i] : *ap;
break;
case nsXPTType::T_BOOL : dp->val.b = (bool) *ap; break;
case nsXPTType::T_CHAR : dp->val.c = (char) *ap; break;
case nsXPTType::T_WCHAR : dp->val.wc = (char16_t) *ap; break;
default:
NS_ERROR("bad type");
break;
}
}
result = self->mOuter->CallMethod((uint16_t)methodIndex, info, dispatchParams);
if(dispatchParams != paramBuffer)
delete [] dispatchParams;
return result;
}
/*
* SharedStub()
* Collects arguments and calls PrepareAndDispatch. The "methodIndex" is
* passed to this function via $1 to preserve the argument registers.
*/
__asm__(
"#### SharedStub ####\n"
".text\n\t"
".align 5\n\t"
".ent SharedStub\n"
"SharedStub:\n\t"
".frame $30,96,$26,0\n\t"
".mask 0x4000000,-96\n\t"
"ldgp $29,0($27)\n"
"$SharedStub..ng:\n\t"
"subq $30,96,$30\n\t"
"stq $26,0($30)\n\t"
".prologue 1\n\t"
/*
* Store arguments passed via registers to the stack.
* Floating point registers are stored as doubles and converted
* to floats in PrepareAndDispatch if necessary.
*/
"stt $f17,16($30)\n\t" /* floating point registers */
"stt $f18,24($30)\n\t"
"stt $f19,32($30)\n\t"
"stt $f20,40($30)\n\t"
"stt $f21,48($30)\n\t"
"stq $17,56($30)\n\t" /* integer registers */
"stq $18,64($30)\n\t"
"stq $19,72($30)\n\t"
"stq $20,80($30)\n\t"
"stq $21,88($30)\n\t"
/*
* Call PrepareAndDispatch function.
*/
"bis $1,$1,$17\n\t" /* pass "methodIndex" */
"addq $30,16,$18\n\t" /* pass "args" */
"bsr $26,$PrepareAndDispatch..ng\n\t"
"ldq $26,0($30)\n\t"
"addq $30,96,$30\n\t"
"ret $31,($26),1\n\t"
".end SharedStub"
);
/*
* nsresult nsXPTCStubBase::Stub##n()
* Sets register $1 to "methodIndex" and jumps to SharedStub.
*/
#define STUB_MANGLED_ENTRY(n, symbol) \
"#### Stub"#n" ####" "\n\t" \
".text" "\n\t" \
".align 5" "\n\t" \
".globl " symbol "\n\t" \
".ent " symbol "\n" \
symbol ":" "\n\t" \
".frame $30,0,$26,0" "\n\t" \
"ldgp $29,0($27)" "\n" \
"$" symbol "..ng:" "\n\t" \
".prologue 1" "\n\t" \
"lda $1,"#n "\n\t" \
"br $31,$SharedStub..ng" "\n\t" \
".end " symbol
#define STUB_ENTRY(n) \
__asm__( \
".if "#n" < 10" "\n\t" \
STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase5Stub"#n"Ev") "\n\t" \
".elseif "#n" < 100" "\n\t" \
STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase6Stub"#n"Ev") "\n\t" \
".elseif "#n" < 1000" "\n\t" \
STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase7Stub"#n"Ev") "\n\t" \
".else" "\n\t" \
".err \"Stub"#n" >= 1000 not yet supported.\"" "\n\t" \
".endif" \
);
#define SENTINEL_ENTRY(n) \
nsresult nsXPTCStubBase::Sentinel##n() \
{ \
NS_ERROR("nsXPTCStubBase::Sentinel called"); \
return NS_ERROR_NOT_IMPLEMENTED; \
}
#include "xptcstubsdef.inc"
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