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96 lines
3 KiB
C++
96 lines
3 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 32/64 bit big-endian PowerPC targets.
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//
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// The System V Application Binary Interface PowerPC Processor Supplement can be
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// found here:
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// http://refspecs.linuxfoundation.org/elf/elfspec_ppc.pdf
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//
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// The PowerOpen 64bit ABI can be found here:
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// http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
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// http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.pdf
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//
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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-ppc.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 PPCTargetABI : TargetABI {
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CompositeToArray32 compositeToArray32;
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CompositeToArray64 compositeToArray64;
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IntegerRewrite integerRewrite;
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const bool Is64Bit;
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explicit PPCTargetABI(const bool Is64Bit) : Is64Bit(Is64Bit) {}
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bool returnInArg(TypeFunction *tf, bool) 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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// The ABI specifies that aggregates of size 8 bytes or less are
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// returned in r3/r4 (ppc) or in r3 (ppc64). Looking at the IR
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// generated by clang this seems not to be implemented. Regardless
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// of size, the aggregate is always returned as sret.
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return rt->ty == Tsarray || rt->ty == Tstruct;
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}
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bool passByVal(TypeFunction *, Type *t) override {
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// On ppc, aggregates are always passed as an indirect value.
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// On ppc64, they are always passed by value. However, clang
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// used byval for type > 64 bytes.
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t = t->toBasetype();
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return (t->ty == Tsarray || t->ty == Tstruct) &&
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(!Is64Bit || t->size() > 64);
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}
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void rewriteFunctionType(IrFuncTy &fty) override {
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// return value
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if (!fty.ret->byref) {
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rewriteArgument(fty, *fty.ret);
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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 (canRewriteAsInt(ty, Is64Bit)) {
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integerRewrite.applyTo(arg);
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} else {
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if (Is64Bit) {
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compositeToArray64.applyTo(arg);
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} else {
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compositeToArray32.applyTo(arg);
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}
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}
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} else if (ty->isintegral()) {
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arg.attrs.addAttribute(ty->isunsigned() ? LLAttribute::ZExt
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: LLAttribute::SExt);
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}
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}
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};
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// The public getter for abi.cpp
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TargetABI *getPPCTargetABI(bool Is64Bit) { return new PPCTargetABI(Is64Bit); }
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