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107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
//===-- abi-ppc64.cpp -----------------------------------------------------===//
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//
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// LDC - the LLVM D compiler
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//
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// This file is distributed under the BSD-style LDC license. See the LICENSE
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// file for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// The ABI implementation used for 64 bit little-endian PowerPC targets.
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//
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// The PowerOpen 64bit ELF v2 ABI can be found here:
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// https://members.openpowerfoundation.org/document/dl/576
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//===----------------------------------------------------------------------===//
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#include "gen/abi.h"
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#include "gen/abi-generic.h"
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#include "gen/abi-ppc64le.h"
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#include "gen/dvalue.h"
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#include "gen/irstate.h"
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#include "gen/llvmhelpers.h"
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#include "gen/tollvm.h"
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struct PPC64LETargetABI : TargetABI {
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HFAToArray hfaToArray;
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CompositeToArray64 compositeToArray64;
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IntegerRewrite integerRewrite;
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explicit PPC64LETargetABI() : hfaToArray(8) {}
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bool returnInArg(TypeFunction *tf) override {
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if (tf->isref) {
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return false;
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}
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Type *rt = tf->next->toBasetype();
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// FIXME: The return value of this function translates
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// to RETstack or RETregs in function retStyle(), which
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// directly influences if NRVO is possible or not
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// (false -> RETregs -> nrvo_can = false). Depending on
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// NRVO, the postblit constructor is called or not.
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// Thus using the rules of the C ABI here (as mandated by
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// the D specification) leads to crashes.
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if (tf->linkage == LINKd)
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return rt->ty == Tsarray || rt->ty == Tstruct;
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return rt->ty == Tsarray || (rt->ty == Tstruct && rt->size() > 16 &&
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!isHFA((TypeStruct *)rt, nullptr, 8));
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}
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bool passByVal(Type *t) override {
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t = t->toBasetype();
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return t->ty == Tsarray || (t->ty == Tstruct && t->size() > 16 &&
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!isHFA((TypeStruct *)t, nullptr, 8));
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}
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void rewriteFunctionType(TypeFunction *tf, IrFuncTy &fty) override {
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// RETURN VALUE
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Type *retTy = fty.ret->type->toBasetype();
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if (!fty.ret->byref) {
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if (retTy->ty == Tstruct || retTy->ty == Tsarray) {
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if (retTy->ty == Tstruct &&
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isHFA((TypeStruct *)retTy, &fty.ret->ltype, 8)) {
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fty.ret->rewrite = &hfaToArray;
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fty.ret->ltype = hfaToArray.type(fty.ret->type);
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} else if (canRewriteAsInt(retTy, true)) {
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fty.ret->rewrite = &integerRewrite;
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fty.ret->ltype = integerRewrite.type(fty.ret->type);
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} else {
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fty.ret->rewrite = &compositeToArray64;
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fty.ret->ltype =
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compositeToArray64.type(fty.ret->type);
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}
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} else if (retTy->isintegral())
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fty.ret->attrs.add(retTy->isunsigned() ? LLAttribute::ZExt
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: LLAttribute::SExt);
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}
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// EXPLICIT PARAMETERS
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for (auto arg : fty.args) {
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if (!arg->byref) {
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rewriteArgument(fty, *arg);
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}
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}
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}
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void rewriteArgument(IrFuncTy &fty, IrFuncTyArg &arg) override {
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Type *ty = arg.type->toBasetype();
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if (ty->ty == Tstruct || ty->ty == Tsarray) {
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if (ty->ty == Tstruct && isHFA((TypeStruct *)ty, &arg.ltype, 8)) {
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arg.rewrite = &hfaToArray;
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arg.ltype = hfaToArray.type(arg.type);
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} else if (canRewriteAsInt(ty, true)) {
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arg.rewrite = &integerRewrite;
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arg.ltype = integerRewrite.type(arg.type);
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} else {
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arg.rewrite = &compositeToArray64;
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arg.ltype = compositeToArray64.type(arg.type);
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}
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} else if (ty->isintegral())
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arg.attrs.add(ty->isunsigned() ? LLAttribute::ZExt : LLAttribute::SExt);
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}
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};
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// The public getter for abi.cpp
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TargetABI *getPPC64LETargetABI() { return new PPC64LETargetABI(); }
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