зеркало из https://github.com/mozilla/gecko-dev.git
189 строки
6.3 KiB
C++
189 строки
6.3 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Implement shared vtbl methods. */
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#include "xptcprivate.h"
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/* Prototype specifies unmangled function name and disables unused warning */
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static nsresult
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PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args)
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__asm__("PrepareAndDispatch") ATTRIBUTE_USED;
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static nsresult
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PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args)
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{
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const uint8_t PARAM_BUFFER_COUNT = 16;
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const uint8_t NUM_ARG_REGS = 6-1; // -1 for "this" pointer
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nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
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nsXPTCMiniVariant* dispatchParams = nullptr;
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const nsXPTMethodInfo* info;
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uint8_t paramCount;
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uint8_t i;
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nsresult result = NS_ERROR_FAILURE;
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NS_ASSERTION(self,"no self");
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self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
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paramCount = info->GetParamCount();
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// setup variant array pointer
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if(paramCount > PARAM_BUFFER_COUNT)
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dispatchParams = new nsXPTCMiniVariant[paramCount];
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else
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dispatchParams = paramBuffer;
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NS_ASSERTION(dispatchParams,"no place for params");
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if (!dispatchParams)
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return NS_ERROR_OUT_OF_MEMORY;
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// args[0] to args[NUM_ARG_REGS] hold floating point register values
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uint64_t* ap = args + NUM_ARG_REGS;
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for(i = 0; i < paramCount; i++, ap++)
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{
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const nsXPTParamInfo& param = info->GetParam(i);
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const nsXPTType& type = param.GetType();
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nsXPTCMiniVariant* dp = &dispatchParams[i];
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if(param.IsOut() || !type.IsArithmetic())
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{
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dp->val.p = (void*) *ap;
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continue;
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}
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// else
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switch(type)
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{
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case nsXPTType::T_I8 : dp->val.i8 = (int8_t) *ap; break;
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case nsXPTType::T_I16 : dp->val.i16 = (int16_t) *ap; break;
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case nsXPTType::T_I32 : dp->val.i32 = (int32_t) *ap; break;
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case nsXPTType::T_I64 : dp->val.i64 = (int64_t) *ap; break;
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case nsXPTType::T_U8 : dp->val.u8 = (uint8_t) *ap; break;
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case nsXPTType::T_U16 : dp->val.u16 = (uint16_t) *ap; break;
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case nsXPTType::T_U32 : dp->val.u32 = (uint32_t) *ap; break;
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case nsXPTType::T_U64 : dp->val.u64 = (uint64_t) *ap; break;
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case nsXPTType::T_FLOAT :
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if(i < NUM_ARG_REGS)
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{
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// floats passed via registers are stored as doubles
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// in the first NUM_ARG_REGS entries in args
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dp->val.u64 = (uint64_t) args[i];
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dp->val.f = (float) dp->val.d; // convert double to float
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}
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else
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dp->val.u32 = (uint32_t) *ap;
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break;
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case nsXPTType::T_DOUBLE :
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// doubles passed via registers are also stored
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// in the first NUM_ARG_REGS entries in args
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dp->val.u64 = (i < NUM_ARG_REGS) ? args[i] : *ap;
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break;
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case nsXPTType::T_BOOL : dp->val.b = (bool) *ap; break;
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case nsXPTType::T_CHAR : dp->val.c = (char) *ap; break;
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case nsXPTType::T_WCHAR : dp->val.wc = (char16_t) *ap; break;
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default:
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NS_ERROR("bad type");
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break;
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}
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}
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result = self->mOuter->CallMethod((uint16_t)methodIndex, info, dispatchParams);
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if(dispatchParams != paramBuffer)
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delete [] dispatchParams;
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return result;
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}
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/*
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* SharedStub()
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* Collects arguments and calls PrepareAndDispatch. The "methodIndex" is
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* passed to this function via $1 to preserve the argument registers.
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*/
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__asm__(
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"#### SharedStub ####\n"
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".text\n\t"
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".align 5\n\t"
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".ent SharedStub\n"
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"SharedStub:\n\t"
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".frame $30,96,$26,0\n\t"
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".mask 0x4000000,-96\n\t"
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"ldgp $29,0($27)\n"
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"$SharedStub..ng:\n\t"
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"subq $30,96,$30\n\t"
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"stq $26,0($30)\n\t"
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".prologue 1\n\t"
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/*
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* Store arguments passed via registers to the stack.
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* Floating point registers are stored as doubles and converted
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* to floats in PrepareAndDispatch if necessary.
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*/
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"stt $f17,16($30)\n\t" /* floating point registers */
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"stt $f18,24($30)\n\t"
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"stt $f19,32($30)\n\t"
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"stt $f20,40($30)\n\t"
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"stt $f21,48($30)\n\t"
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"stq $17,56($30)\n\t" /* integer registers */
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"stq $18,64($30)\n\t"
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"stq $19,72($30)\n\t"
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"stq $20,80($30)\n\t"
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"stq $21,88($30)\n\t"
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/*
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* Call PrepareAndDispatch function.
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*/
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"bis $1,$1,$17\n\t" /* pass "methodIndex" */
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"addq $30,16,$18\n\t" /* pass "args" */
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"bsr $26,$PrepareAndDispatch..ng\n\t"
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"ldq $26,0($30)\n\t"
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"addq $30,96,$30\n\t"
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"ret $31,($26),1\n\t"
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".end SharedStub"
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);
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/*
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* nsresult nsXPTCStubBase::Stub##n()
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* Sets register $1 to "methodIndex" and jumps to SharedStub.
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*/
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#define STUB_MANGLED_ENTRY(n, symbol) \
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"#### Stub"#n" ####" "\n\t" \
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".text" "\n\t" \
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".align 5" "\n\t" \
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".globl " symbol "\n\t" \
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".ent " symbol "\n" \
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symbol ":" "\n\t" \
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".frame $30,0,$26,0" "\n\t" \
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"ldgp $29,0($27)" "\n" \
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"$" symbol "..ng:" "\n\t" \
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".prologue 1" "\n\t" \
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"lda $1,"#n "\n\t" \
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"br $31,$SharedStub..ng" "\n\t" \
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".end " symbol
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#define STUB_ENTRY(n) \
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__asm__( \
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".if "#n" < 10" "\n\t" \
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STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase5Stub"#n"Ev") "\n\t" \
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".elseif "#n" < 100" "\n\t" \
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STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase6Stub"#n"Ev") "\n\t" \
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".elseif "#n" < 1000" "\n\t" \
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STUB_MANGLED_ENTRY(n, "_ZN14nsXPTCStubBase7Stub"#n"Ev") "\n\t" \
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".else" "\n\t" \
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".err \"Stub"#n" >= 1000 not yet supported.\"" "\n\t" \
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".endif" \
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);
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#define SENTINEL_ENTRY(n) \
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nsresult nsXPTCStubBase::Sentinel##n() \
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{ \
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NS_ERROR("nsXPTCStubBase::Sentinel called"); \
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return NS_ERROR_NOT_IMPLEMENTED; \
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}
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#include "xptcstubsdef.inc"
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