207 lines
7.0 KiB
C++
207 lines
7.0 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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// Implement shared vtbl methods.
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#include "xptcprivate.h"
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// The Linux/x86-64 ABI passes the first 6 integral parameters and the
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// first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
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// r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
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// caller. The rest of the parameters are passed in the callers stack
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// area.
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const PRUint32 PARAM_BUFFER_COUNT = 16;
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const PRUint32 GPR_COUNT = 6;
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const PRUint32 FPR_COUNT = 8;
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// PrepareAndDispatch() is called by SharedStub() and calls the actual method.
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//
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// - 'args[]' contains the arguments passed on stack
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// - 'gpregs[]' contains the arguments passed in integer registers
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// - 'fpregs[]' contains the arguments passed in floating point registers
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//
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// The parameters are mapped into an array of type 'nsXPTCMiniVariant'
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// and then the method gets called.
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extern "C" nsresult
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PrepareAndDispatch(nsXPTCStubBase * self, PRUint32 methodIndex,
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PRUint64 * args, PRUint64 * gpregs, double *fpregs)
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{
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nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
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nsXPTCMiniVariant* dispatchParams = NULL;
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nsIInterfaceInfo* iface_info = NULL;
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const nsXPTMethodInfo* info;
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PRUint32 paramCount;
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PRUint32 i;
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nsresult result = NS_ERROR_FAILURE;
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NS_ASSERTION(self,"no self");
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self->GetInterfaceInfo(&iface_info);
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NS_ASSERTION(iface_info,"no interface info");
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if (! iface_info)
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return NS_ERROR_UNEXPECTED;
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iface_info->GetMethodInfo(PRUint16(methodIndex), &info);
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NS_ASSERTION(info,"no method info");
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if (! info)
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return NS_ERROR_UNEXPECTED;
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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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PRUint64* ap = args;
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PRUint32 nr_gpr = 1; // skip one GPR register for 'that'
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PRUint32 nr_fpr = 0;
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PRUint64 value;
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for(i = 0; i < paramCount; i++) {
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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 == nsXPTType::T_DOUBLE) {
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if (nr_fpr < FPR_COUNT)
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dp->val.d = fpregs[nr_fpr++];
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else
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dp->val.d = *(double*) ap++;
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continue;
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}
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else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
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if (nr_fpr < FPR_COUNT)
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// The value in %xmm register is already prepared to
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// be retrieved as a float. Therefore, we pass the
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// value verbatim, as a double without conversion.
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dp->val.d = *(double*) ap++;
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else
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dp->val.f = *(float*) ap++;
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continue;
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}
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else {
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if (nr_gpr < GPR_COUNT)
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value = gpregs[nr_gpr++];
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else
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value = *ap++;
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}
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if (param.IsOut() || !type.IsArithmetic()) {
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dp->val.p = (void*) value;
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continue;
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}
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switch (type) {
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case nsXPTType::T_I8: dp->val.i8 = (PRInt8) value; break;
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case nsXPTType::T_I16: dp->val.i16 = (PRInt16) value; break;
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case nsXPTType::T_I32: dp->val.i32 = (PRInt32) value; break;
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case nsXPTType::T_I64: dp->val.i64 = (PRInt64) value; break;
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case nsXPTType::T_U8: dp->val.u8 = (PRUint8) value; break;
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case nsXPTType::T_U16: dp->val.u16 = (PRUint16) value; break;
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case nsXPTType::T_U32: dp->val.u32 = (PRUint32) value; break;
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case nsXPTType::T_U64: dp->val.u64 = (PRUint64) value; break;
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case nsXPTType::T_BOOL: dp->val.b = (PRBool) value; break;
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case nsXPTType::T_CHAR: dp->val.c = (char) value; break;
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case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break;
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default:
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NS_ASSERTION(0, "bad type");
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break;
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}
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}
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result = self->CallMethod((PRUint16) methodIndex, info, dispatchParams);
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NS_RELEASE(iface_info);
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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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#if defined(__GXX_ABI_VERSION) && __GXX_ABI_VERSION >= 100 /* G++ V3 ABI */
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// Linux/x86-64 uses gcc >= 3.1
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#define STUB_ENTRY(n) \
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asm(".section \".text\"\n\t" \
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".align 2\n\t" \
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".if " #n " < 10\n\t" \
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".globl _ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
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".type _ZN14nsXPTCStubBase5Stub" #n "Ev,@function\n" \
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"_ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
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".elseif " #n " < 100\n\t" \
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".globl _ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
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".type _ZN14nsXPTCStubBase6Stub" #n "Ev,@function\n" \
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"_ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
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".elseif " #n " < 1000\n\t" \
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".globl _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
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".type _ZN14nsXPTCStubBase7Stub" #n "Ev,@function\n" \
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"_ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
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".else\n\t" \
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".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \
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".endif\n\t" \
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"movl $" #n ", %eax\n\t" \
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"jmp SharedStub\n\t" \
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".if " #n " < 10\n\t" \
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".size _ZN14nsXPTCStubBase5Stub" #n "Ev,.-_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
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".elseif " #n " < 100\n\t" \
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".size _ZN14nsXPTCStubBase6Stub" #n "Ev,.-_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
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".else\n\t" \
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".size _ZN14nsXPTCStubBase7Stub" #n "Ev,.-_ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
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".endif");
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// static nsresult SharedStub(PRUint32 methodIndex)
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asm(".section \".text\"\n\t"
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".align 2\n\t"
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".type SharedStub,@function\n\t"
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"SharedStub:\n\t"
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// make room for gpregs (48), fpregs (64)
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"pushq %rbp\n\t"
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"movq %rsp,%rbp\n\t"
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"subq $112,%rsp\n\t"
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// save GP registers
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"movq %rdi,-112(%rbp)\n\t"
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"movq %rsi,-104(%rbp)\n\t"
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"movq %rdx, -96(%rbp)\n\t"
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"movq %rcx, -88(%rbp)\n\t"
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"movq %r8 , -80(%rbp)\n\t"
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"movq %r9 , -72(%rbp)\n\t"
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"leaq -112(%rbp),%rcx\n\t"
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// save FP registers
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"movsd %xmm0,-64(%rbp)\n\t"
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"movsd %xmm1,-56(%rbp)\n\t"
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"movsd %xmm2,-48(%rbp)\n\t"
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"movsd %xmm3,-40(%rbp)\n\t"
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"movsd %xmm4,-32(%rbp)\n\t"
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"movsd %xmm5,-24(%rbp)\n\t"
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"movsd %xmm6,-16(%rbp)\n\t"
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"movsd %xmm7, -8(%rbp)\n\t"
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"leaq -64(%rbp),%r8\n\t"
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// rdi has the 'self' pointer already
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"movl %eax,%esi\n\t"
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"leaq 16(%rbp),%rdx\n\t"
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"call PrepareAndDispatch\n\t"
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"leave\n\t"
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"ret\n\t"
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".size SharedStub,.-SharedStub");
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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_ASSERTION(0,"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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#else
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#error "can't find a compiler to use"
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#endif /* __GNUC__ */
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