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//===-- abi-ppc64.cpp -----------------------------------------------------===//
//
// LDC ? the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
//
// The ABI implementation used for 32/64 bit big-endian PowerPC targets.
//
// The System V Application Binary Interface PowerPC Processor Supplement can be
// found here:
// http://refspecs.linuxfoundation.org/elf/elfspec_ppc.pdf
//
// The PowerOpen 64bit ABI can be found here:
// http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
// http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.pdf
//
//===----------------------------------------------------------------------===//
#include "gen/abi.h"
#include "gen/abi-generic.h"
#include "gen/abi-ppc.h"
#include "gen/dvalue.h"
#include "gen/irstate.h"
#include "gen/llvmhelpers.h"
#include "gen/tollvm.h"
struct PPCTargetABI : TargetABI {
CompositeToArray32 compositeToArray32;
CompositeToArray64 compositeToArray64;
IntegerRewrite integerRewrite;
const bool Is64Bit;
explicit PPCTargetABI(const bool Is64Bit) : Is64Bit(Is64Bit) {}
bool returnInArg(TypeFunction *tf, bool) override {
if (tf->isref()) {
return false;
}
Type *rt = tf->next->toBasetype();
// The ABI specifies that aggregates of size 8 bytes or less are
// returned in r3/r4 (ppc) or in r3 (ppc64). Looking at the IR
// generated by clang this seems not to be implemented. Regardless
// of size, the aggregate is always returned as sret.
return rt->ty == TY::Tsarray || rt->ty == TY::Tstruct;
}
bool passByVal(TypeFunction *, Type *t) override {
// On ppc, aggregates are always passed as an indirect value.
// On ppc64, they are always passed by value. However, clang
// used byval for type > 64 bytes.
t = t->toBasetype();
return (t->ty == TY::Tsarray || t->ty == TY::Tstruct) &&
(!Is64Bit || t->size() > 64);
}
void rewriteFunctionType(IrFuncTy &fty) override {
// return value
if (!fty.ret->byref) {
rewriteArgument(fty, *fty.ret);
}
// explicit parameters
for (auto arg : fty.args) {
if (!arg->byref) {
rewriteArgument(fty, *arg);
}
}
}
void rewriteArgument(IrFuncTy &fty, IrFuncTyArg &arg) override {
Type *ty = arg.type->toBasetype();
if (ty->ty == TY::Tstruct || ty->ty == TY::Tsarray) {
if (canRewriteAsInt(ty, Is64Bit)) {
integerRewrite.applyTo(arg);
} else {
if (Is64Bit) {
compositeToArray64.applyTo(arg);
} else {
compositeToArray32.applyTo(arg);
}
}
} else if (ty->isintegral()) {
arg.attrs.addAttribute(ty->isunsigned() ? LLAttribute::ZExt
: LLAttribute::SExt);
}
}
};
// The public getter for abi.cpp
TargetABI *getPPCTargetABI(bool Is64Bit) { return new PPCTargetABI(Is64Bit); }
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