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abi-x86.cpp
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abi-x86.cpp
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//===-- abi-x86.cpp -------------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "gen/llvm.h"
#include "mars.h"
#include "gen/abi-generic.h"
#include "gen/abi.h"
#include "gen/dvalue.h"
#include "gen/irstate.h"
#include "gen/llvmhelpers.h"
#include "gen/logger.h"
#include "gen/tollvm.h"
#include "ir/irfunction.h"
#include "ir/irfuncty.h"
struct X86TargetABI : TargetABI
{
X87_complex_swap swapComplex;
CfloatToInt cfloatToInt;
CompositeToInt compositeToInt;
llvm::CallingConv::ID callingConv(LINK l)
{
switch (l)
{
case LINKc:
case LINKcpp:
case LINKintrinsic:
return llvm::CallingConv::C;
case LINKd:
case LINKdefault:
case LINKpascal:
case LINKwindows:
return llvm::CallingConv::X86_StdCall;
default:
llvm_unreachable("Unhandled D linkage type.");
}
}
std::string mangleForLLVM(llvm::StringRef name, LINK l)
{
switch (l)
{
case LINKc:
case LINKcpp:
case LINKintrinsic:
case LINKpascal:
case LINKwindows:
return name;
case LINKd:
case LINKdefault:
if (global.params.targetTriple.isOSWindows())
{
// Prepend a 0x1 byte to keep LLVM from adding the usual
// "@<paramsize>" stdcall suffix.
return ("\1_" + name).str();
}
return name;
default:
llvm_unreachable("Unhandled D linkage type.");
}
}
bool returnInArg(TypeFunction* tf)
{
if (tf->isref)
return false;
Type* rt = tf->next->toBasetype();
// D only returns structs on the stack
if (tf->linkage == LINKd)
{
return rt->ty == Tstruct
|| rt->ty == Tsarray
;
}
// other ABI's follow C, which is cdouble and creal returned on the stack
// as well as structs
else
return (rt->ty == Tstruct || rt->ty == Tcomplex64 || rt->ty == Tcomplex80);
}
bool passByVal(Type* t)
{
return t->toBasetype()->ty == Tstruct || t->toBasetype()->ty == Tsarray;
}
void rewriteFunctionType(TypeFunction* tf, IrFuncTy &fty)
{
Type* rt = fty.ret->type->toBasetype();
// extern(D)
if (tf->linkage == LINKd)
{
// RETURN VALUE
// complex {re,im} -> {im,re}
if (rt->iscomplex())
{
Logger::println("Rewriting complex return value");
fty.ret->rewrite = &swapComplex;
}
// IMPLICIT PARAMETERS
// mark this/nested params inreg
if (fty.arg_this)
{
Logger::println("Putting 'this' in register");
#if LDC_LLVM_VER >= 303
fty.arg_this->attrs.clear();
fty.arg_this->attrs.addAttribute(llvm::Attribute::InReg);
#elif LDC_LLVM_VER == 302
fty.arg_this->attrs = llvm::Attributes::get(gIR->context(), llvm::AttrBuilder().addAttribute(llvm::Attributes::InReg));
#else
fty.arg_this->attrs = llvm::Attribute::InReg;
#endif
}
else if (fty.arg_nest)
{
Logger::println("Putting context ptr in register");
#if LDC_LLVM_VER >= 303
fty.arg_nest->attrs.clear();
fty.arg_nest->attrs.addAttribute(llvm::Attribute::InReg);
#elif LDC_LLVM_VER == 302
fty.arg_nest->attrs = llvm::Attributes::get(gIR->context(), llvm::AttrBuilder().addAttribute(llvm::Attributes::InReg));
#else
fty.arg_nest->attrs = llvm::Attribute::InReg;
#endif
}
else if (IrFuncTyArg* sret = fty.arg_sret)
{
Logger::println("Putting sret ptr in register");
// sret and inreg are incompatible, but the ABI requires the
// sret parameter to be in EAX in this situation...
#if LDC_LLVM_VER >= 303
sret->attrs.addAttribute(llvm::Attribute::InReg).removeAttribute(llvm::Attribute::StructRet);
#elif LDC_LLVM_VER == 302
sret->attrs = llvm::Attributes::get(gIR->context(), llvm::AttrBuilder(sret->attrs).addAttribute(llvm::Attributes::InReg)
.removeAttribute(llvm::Attributes::StructRet));
#else
sret->attrs = (sret->attrs | llvm::Attribute::InReg)
& ~llvm::Attribute::StructRet;
#endif
}
// otherwise try to mark the last param inreg
else if (!fty.args.empty())
{
// The last parameter is passed in EAX rather than being pushed on the stack if the following conditions are met:
// * It fits in EAX.
// * It is not a 3 byte struct.
// * It is not a floating point type.
IrFuncTyArg* last = fty.args.back();
Type* lastTy = last->type->toBasetype();
unsigned sz = lastTy->size();
if (last->byref && !last->isByVal())
{
Logger::println("Putting last (byref) parameter in register");
#if LDC_LLVM_VER >= 303
last->attrs.addAttribute(llvm::Attribute::InReg);
#elif LDC_LLVM_VER == 302
last->attrs = llvm::Attributes::get(gIR->context(), llvm::AttrBuilder(last->attrs).addAttribute(llvm::Attributes::InReg));
#else
last->attrs |= llvm::Attribute::InReg;
#endif
}
else if (!lastTy->isfloating() && (sz == 1 || sz == 2 || sz == 4)) // right?
{
// rewrite the struct into an integer to make inreg work
if (lastTy->ty == Tstruct || lastTy->ty == Tsarray)
{
last->rewrite = &compositeToInt;
last->ltype = compositeToInt.type(last->type, last->ltype);
last->byref = false;
// erase previous attributes
#if LDC_LLVM_VER >= 303
last->attrs.clear();
#elif LDC_LLVM_VER == 302
last->attrs = llvm::Attributes();
#else
last->attrs = llvm::Attribute::None;
#endif
}
#if LDC_LLVM_VER >= 303
last->attrs.addAttribute(llvm::Attribute::InReg);
#elif LDC_LLVM_VER == 302
last->attrs = llvm::Attributes::get(gIR->context(), llvm::AttrBuilder(last->attrs).addAttribute(llvm::Attributes::InReg));
#else
last->attrs |= llvm::Attribute::InReg;
#endif
}
}
// FIXME: tf->varargs == 1 need to use C calling convention and vararg mechanism to live up to the spec:
// "The caller is expected to clean the stack. _argptr is not passed, it is computed by the callee."
// EXPLICIT PARAMETERS
// reverse parameter order
// for non variadics
if (!fty.args.empty() && tf->varargs != 1)
{
fty.reverseParams = true;
}
}
// extern(C) and all others
else
{
// RETURN VALUE
// cfloat -> i64
if (tf->next->toBasetype() == Type::tcomplex32)
{
fty.ret->rewrite = &cfloatToInt;
fty.ret->ltype = LLType::getInt64Ty(gIR->context());
}
// IMPLICIT PARAMETERS
// EXPLICIT PARAMETERS
}
}
};
// The public getter for abi.cpp.
TargetABI* getX86TargetABI() {
return new X86TargetABI;
}