/
tocall.cpp
736 lines (649 loc) · 24.5 KB
/
tocall.cpp
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#include "gen/llvm.h"
#include "mtype.h"
#include "declaration.h"
#include "id.h"
#include "gen/tollvm.h"
#include "gen/llvmhelpers.h"
#include "gen/irstate.h"
#include "gen/dvalue.h"
#include "gen/functions.h"
#include "gen/abi.h"
#include "gen/nested.h"
#include "gen/logger.h"
//////////////////////////////////////////////////////////////////////////////////////////
TypeFunction* DtoTypeFunction(DValue* fnval)
{
Type* type = fnval->getType()->toBasetype();
if (type->ty == Tfunction)
{
return static_cast<TypeFunction*>(type);
}
else if (type->ty == Tdelegate)
{
// FIXME: There is really no reason why the function type should be
// unmerged at this stage, but the frontend still seems to produce such
// cases; for example for the uint(uint) next type of the return type of
// (&zero)(), leading to a crash in DtoCallFunction:
// ---
// void test8198() {
// uint delegate(uint) zero() { return null; }
// auto a = (&zero)()(0);
// }
// ---
// Calling merge() here works around the symptoms, but does not fix the
// root cause.
Type* next = type->nextOf()->merge();
assert(next->ty == Tfunction);
return static_cast<TypeFunction*>(next);
}
assert(0 && "cant get TypeFunction* from non lazy/function/delegate");
return 0;
}
//////////////////////////////////////////////////////////////////////////////////////////
llvm::CallingConv::ID DtoCallingConv(Loc loc, LINK l)
{
if (l == LINKc || l == LINKcpp || l == LINKintrinsic)
return llvm::CallingConv::C;
else if (l == LINKd || l == LINKdefault)
{
//TODO: StdCall is not a good base on Windows due to extra name mangling
// applied there
if (global.params.cpu == ARCHx86 || global.params.cpu == ARCHx86_64)
return (global.params.os != OSWindows) ? llvm::CallingConv::X86_StdCall : llvm::CallingConv::C;
else
return llvm::CallingConv::Fast;
}
// on the other hand, here, it's exactly what we want!!! TODO: right?
// On Windows 64bit, there is only one calling convention!
else if (l == LINKwindows)
return global.params.cpu == ARCHx86_64 ? llvm::CallingConv::C : llvm::CallingConv::X86_StdCall;
else if (l == LINKpascal)
return llvm::CallingConv::X86_StdCall;
else
{
error(loc, "unsupported calling convention");
fatal();
}
}
//////////////////////////////////////////////////////////////////////////////////////////
DValue* DtoVaArg(Loc& loc, Type* type, Expression* valistArg)
{
DValue* expelem = valistArg->toElem(gIR);
LLType* llt = DtoType(type);
if (DtoIsPassedByRef(type))
llt = getPtrToType(llt);
// issue a warning for broken va_arg instruction.
if (global.params.cpu != ARCHx86)
warning(Loc(), "%s: va_arg for C variadic functions is probably broken for anything but x86", loc.toChars());
// done
return new DImValue(type, gIR->ir->CreateVAArg(expelem->getLVal(), llt, "tmp"));
}
//////////////////////////////////////////////////////////////////////////////////////////
LLValue* DtoCallableValue(DValue* fn)
{
Type* type = fn->getType()->toBasetype();
if (type->ty == Tfunction)
{
return fn->getRVal();
}
else if (type->ty == Tdelegate)
{
if (fn->isLVal())
{
LLValue* dg = fn->getLVal();
LLValue* funcptr = DtoGEPi(dg, 0, 1);
return DtoLoad(funcptr);
}
else
{
LLValue* dg = fn->getRVal();
assert(isaStruct(dg));
return gIR->ir->CreateExtractValue(dg, 1, ".funcptr");
}
}
else
{
assert(0 && "not a callable type");
return NULL;
}
}
//////////////////////////////////////////////////////////////////////////////////////////
LLFunctionType* DtoExtractFunctionType(LLType* type)
{
if (LLFunctionType* fty = isaFunction(type))
return fty;
else if (LLPointerType* pty = isaPointer(type))
{
if (LLFunctionType* fty = isaFunction(pty->getElementType()))
return fty;
}
return NULL;
}
//////////////////////////////////////////////////////////////////////////////////////////
static LLValue *fixArgument(DValue *argval, TypeFunction* tf, LLType *callableArgType, int argIndex)
{
#if 0
if (Logger::enabled()) {
Logger::cout() << "Argument before ABI: " << *argval->getRVal() << '\n';
Logger::cout() << "Argument type before ABI: " << *DtoType(argval->getType()) << '\n';
}
#endif
// give the ABI a say
LLValue* arg = tf->fty.putParam(argval->getType(), argIndex, argval);
#if 0
if (Logger::enabled()) {
Logger::cout() << "Argument after ABI: " << *arg << '\n';
Logger::cout() << "Argument type after ABI: " << *arg->getType() << '\n';
}
#endif
// Hack around LDC assuming structs and static arrays are in memory:
// If the function wants a struct, and the argument value is a
// pointer to a struct, load from it before passing it in.
int ty = argval->getType()->toBasetype()->ty;
if (isaPointer(arg) && !isaPointer(callableArgType) &&
#if DMDV2
(ty == Tstruct || ty == Tsarray))
#else
ty == Tstruct)
#endif
{
Logger::println("Loading struct type for function argument");
arg = DtoLoad(arg);
}
// parameter type mismatch, this is hard to get rid of
if (arg->getType() != callableArgType)
{
#if 1
if (Logger::enabled())
{
Logger::cout() << "arg: " << *arg << '\n';
Logger::cout() << "of type: " << *arg->getType() << '\n';
Logger::cout() << "expects: " << *callableArgType << '\n';
}
#endif
if (isaStruct(arg))
arg = DtoAggrPaint(arg, callableArgType);
else
arg = DtoBitCast(arg, callableArgType);
}
return arg;
}
//////////////////////////////////////////////////////////////////////////////////////////
void DtoBuildDVarArgList(std::vector<LLValue*>& args,
std::vector<llvm::AttributeWithIndex>& attrs,
TypeFunction* tf, Expressions* arguments,
size_t argidx,
LLFunctionType* callableTy)
{
Logger::println("doing d-style variadic arguments");
LOG_SCOPE
std::vector<LLType*> vtypes;
// number of non variadic args
int begin = Parameter::dim(tf->parameters);
Logger::println("num non vararg params = %d", begin);
// get n args in arguments list
size_t n_arguments = arguments ? arguments->dim : 0;
// build struct with argument types (non variadic args)
for (int i=begin; i<n_arguments; i++)
{
Expression* argexp = static_cast<Expression*>(arguments->data[i]);
assert(argexp->type->ty != Ttuple);
vtypes.push_back(DtoType(argexp->type));
size_t sz = getTypePaddedSize(vtypes.back());
size_t asz = (sz + PTRSIZE - 1) & ~(PTRSIZE -1);
if (sz != asz)
{
if (sz < PTRSIZE)
{
vtypes.back() = DtoSize_t();
}
else
{
// ok then... so we build some type that is big enough
// and aligned to PTRSIZE
std::vector<LLType*> gah;
gah.reserve(asz/PTRSIZE);
size_t gah_sz = 0;
while (gah_sz < asz)
{
gah.push_back(DtoSize_t());
gah_sz += PTRSIZE;
}
vtypes.back() = LLStructType::get(gIR->context(), gah, true);
}
}
}
LLStructType* vtype = LLStructType::get(gIR->context(), vtypes);
if (Logger::enabled())
Logger::cout() << "d-variadic argument struct type:\n" << *vtype << '\n';
LLValue* mem = DtoRawAlloca(vtype, 0, "_argptr_storage");
// store arguments in the struct
for (int i=begin,k=0; i<n_arguments; i++,k++)
{
Expression* argexp = static_cast<Expression*>(arguments->data[i]);
if (global.params.llvmAnnotate)
DtoAnnotation(argexp->toChars());
LLValue* argdst = DtoGEPi(mem,0,k);
argdst = DtoBitCast(argdst, getPtrToType(DtoType(argexp->type)));
DtoVariadicArgument(argexp, argdst);
}
// build type info array
LLType* typeinfotype = DtoType(Type::typeinfo->type);
LLArrayType* typeinfoarraytype = LLArrayType::get(typeinfotype,vtype->getNumElements());
llvm::GlobalVariable* typeinfomem =
new llvm::GlobalVariable(*gIR->module, typeinfoarraytype, true, llvm::GlobalValue::InternalLinkage, NULL, "._arguments.storage");
if (Logger::enabled())
Logger::cout() << "_arguments storage: " << *typeinfomem << '\n';
std::vector<LLConstant*> vtypeinfos;
for (int i=begin,k=0; i<n_arguments; i++,k++)
{
Expression* argexp = static_cast<Expression*>(arguments->data[i]);
vtypeinfos.push_back(DtoTypeInfoOf(argexp->type));
}
// apply initializer
LLConstant* tiinits = LLConstantArray::get(typeinfoarraytype, vtypeinfos);
typeinfomem->setInitializer(tiinits);
// put data in d-array
std::vector<LLConstant*> pinits;
pinits.push_back(DtoConstSize_t(vtype->getNumElements()));
pinits.push_back(llvm::ConstantExpr::getBitCast(typeinfomem, getPtrToType(typeinfotype)));
LLType* tiarrty = DtoType(Type::typeinfo->type->arrayOf());
tiinits = LLConstantStruct::get(isaStruct(tiarrty), pinits);
LLValue* typeinfoarrayparam = new llvm::GlobalVariable(*gIR->module, tiarrty,
true, llvm::GlobalValue::InternalLinkage, tiinits, "._arguments.array");
llvm::AttributeWithIndex Attr;
// specify arguments
args.push_back(DtoLoad(typeinfoarrayparam));
if (llvm::Attributes atts = tf->fty.arg_arguments->attrs) {
Attr.Index = argidx;
Attr.Attrs = atts;
attrs.push_back(Attr);
}
++argidx;
args.push_back(gIR->ir->CreateBitCast(mem, getPtrToType(LLType::getInt8Ty(gIR->context())), "tmp"));
if (llvm::Attributes atts = tf->fty.arg_argptr->attrs) {
Attr.Index = argidx;
Attr.Attrs = atts;
attrs.push_back(Attr);
}
// pass non variadic args
for (int i=0; i<begin; i++)
{
Parameter* fnarg = Parameter::getNth(tf->parameters, i);
DValue* argval = DtoArgument(fnarg, static_cast<Expression*>(arguments->data[i]));
args.push_back(fixArgument(argval, tf, callableTy->getParamType(argidx++), i));
if (tf->fty.args[i]->attrs)
{
llvm::AttributeWithIndex Attr;
Attr.Index = argidx;
Attr.Attrs = tf->fty.args[i]->attrs;
attrs.push_back(Attr);
}
}
}
//////////////////////////////////////////////////////////////////////////////////////////
// FIXME: this function is a mess !
DValue* DtoCallFunction(Loc& loc, Type* resulttype, DValue* fnval, Expressions* arguments)
{
if (Logger::enabled()) {
Logger::println("DtoCallFunction()");
}
LOG_SCOPE
// the callee D type
Type* calleeType = fnval->getType();
// make sure the callee type has been processed
DtoType(calleeType);
// get func value if any
DFuncValue* dfnval = fnval->isFunc();
// handle special vararg intrinsics
bool va_intrinsic = (dfnval && dfnval->func && dfnval->func->isVaIntrinsic());
// get function type info
TypeFunction* tf = DtoTypeFunction(fnval);
// misc
bool retinptr = tf->fty.arg_sret;
bool thiscall = tf->fty.arg_this;
bool delegatecall = (calleeType->toBasetype()->ty == Tdelegate);
bool nestedcall = tf->fty.arg_nest;
bool dvarargs = (tf->linkage == LINKd && tf->varargs == 1);
llvm::CallingConv::ID callconv = DtoCallingConv(loc, tf->linkage);
// get callee llvm value
LLValue* callable = DtoCallableValue(fnval);
LLFunctionType* callableTy = DtoExtractFunctionType(callable->getType());
assert(callableTy);
// if (Logger::enabled())
// Logger::cout() << "callable: " << *callable << '\n';
// get n arguments
size_t n_arguments = arguments ? arguments->dim : 0;
// get llvm argument iterator, for types
LLFunctionType::param_iterator argbegin = callableTy->param_begin();
LLFunctionType::param_iterator argiter = argbegin;
// parameter attributes
std::vector<llvm::AttributeWithIndex> attrs;
llvm::AttributeWithIndex Attr;
// return attrs
if (tf->fty.ret->attrs)
{
Attr.Index = 0;
Attr.Attrs = tf->fty.ret->attrs;
attrs.push_back(Attr);
}
// handle implicit arguments
std::vector<LLValue*> args;
args.reserve(tf->fty.args.size());
// return in hidden ptr is first
if (retinptr)
{
LLValue* retvar = DtoRawAlloca((*argiter)->getContainedType(0), resulttype->alignsize(), ".rettmp");
++argiter;
args.push_back(retvar);
// add attrs for hidden ptr
Attr.Index = 1;
Attr.Attrs = tf->fty.arg_sret->attrs;
assert((Attr.Attrs & (llvm::Attribute::StructRet | llvm::Attribute::InReg))
&& "Sret arg not sret or inreg?");
attrs.push_back(Attr);
}
// then comes a context argument...
if(thiscall || delegatecall || nestedcall)
{
if (dfnval && (dfnval->func->ident == Id::ensure ||
dfnval->func->ident == Id::require))
{
// ... which can be the this "context" argument for a contract
// invocation (we do not generate a full nested context struct for
// these)
LLValue* thisarg = DtoBitCast(DtoLoad(gIR->func()->thisArg), getVoidPtrType());
++argiter;
args.push_back(thisarg);
}
else if (thiscall && dfnval && dfnval->vthis)
{
// ... or a normal 'this' argument
LLValue* thisarg = DtoBitCast(dfnval->vthis, *argiter);
++argiter;
args.push_back(thisarg);
}
else if (delegatecall)
{
// ... or a delegate context arg
LLValue* ctxarg;
if (fnval->isLVal())
{
ctxarg = DtoLoad(DtoGEPi(fnval->getLVal(), 0,0));
}
else
{
ctxarg = gIR->ir->CreateExtractValue(fnval->getRVal(), 0, ".ptr");
}
ctxarg = DtoBitCast(ctxarg, *argiter);
++argiter;
args.push_back(ctxarg);
}
else if (nestedcall)
{
/// ... or a nested function context arg
if (dfnval) {
LLValue* contextptr = DtoNestedContext(loc, dfnval->func);
contextptr = DtoBitCast(contextptr, getVoidPtrType());
args.push_back(contextptr);
} else {
args.push_back(llvm::UndefValue::get(getVoidPtrType()));
}
++argiter;
}
else
{
error(loc, "Context argument required but none given");
fatal();
}
// add attributes for context argument
if (tf->fty.arg_this && tf->fty.arg_this->attrs)
{
Attr.Index = retinptr ? 2 : 1;
Attr.Attrs = tf->fty.arg_this->attrs;
attrs.push_back(Attr);
}
else if (tf->fty.arg_nest && tf->fty.arg_nest->attrs)
{
Attr.Index = retinptr ? 2 : 1;
Attr.Attrs = tf->fty.arg_nest->attrs;
attrs.push_back(Attr);
}
}
// handle the rest of the arguments based on param passing style
// variadic intrinsics need some custom casts
if (va_intrinsic)
{
for (int i=0; i<n_arguments; i++)
{
Expression* exp = static_cast<Expression*>(arguments->data[i]);
DValue* expelem = exp->toElem(gIR);
// cast to va_list*
LLValue* val = DtoBitCast(expelem->getLVal(), getVoidPtrType());
++argiter;
args.push_back(val);
}
}
// d style varargs needs a few more hidden arguments as well as special passing
else if (dvarargs)
{
DtoBuildDVarArgList(args, attrs, tf, arguments, argiter-argbegin+1, callableTy);
}
// otherwise we're looking at a normal function call
// or a C style vararg call
else
{
Logger::println("doing normal arguments");
if (Logger::enabled()) {
Logger::println("Arguments so far: (%d)", static_cast<int>(args.size()));
Logger::indent();
for (size_t i = 0; i < args.size(); i++) {
Logger::cout() << *args[i] << '\n';
}
Logger::undent();
Logger::cout() << "Function type: " << tf->toChars() << '\n';
//Logger::cout() << "LLVM functype: " << *callable->getType() << '\n';
}
size_t n = Parameter::dim(tf->parameters);
LLSmallVector<llvm::Attributes, 10> attrptr(n, llvm::Attribute::None);
std::vector<DValue*> argvals;
if (dfnval && dfnval->func->isArrayOp) {
// slightly different approach for array operators
for (int i=n-1; i>=0; --i) {
Parameter* fnarg = Parameter::getNth(tf->parameters, i);
assert(fnarg);
DValue* argval = DtoArgument(fnarg, static_cast<Expression*>(arguments->data[i]));
argvals.insert(argvals.begin(), argval);
}
} else {
for (int i=0; i<n; ++i) {
Parameter* fnarg = Parameter::getNth(tf->parameters, i);
assert(fnarg);
DValue* argval = DtoArgument(fnarg, static_cast<Expression*>(arguments->data[i]));
argvals.push_back(argval);
}
}
// do formal params
int beg = argiter-argbegin;
for (int i=0; i<n; i++)
{
DValue* argval = argvals.at(i);
int j = tf->fty.reverseParams ? beg + n - i - 1 : beg + i;
LLValue *arg = fixArgument(argval, tf, callableTy->getParamType(j), i);
args.push_back(arg);
attrptr[i] = tf->fty.args[i]->attrs;
++argiter;
}
// reverse the relevant params as well as the param attrs
if (tf->fty.reverseParams)
{
std::reverse(args.begin() + beg, args.end());
std::reverse(attrptr.begin(), attrptr.end());
}
// add attributes
for (int i = 0; i < n; i++)
{
if (attrptr[i])
{
Attr.Index = beg + i + 1;
Attr.Attrs = attrptr[i];
attrs.push_back(Attr);
}
}
// do C varargs
if (n_arguments > n)
{
for (int i=n; i<n_arguments; i++)
{
Parameter* fnarg = Parameter::getNth(tf->parameters, i);
DValue* argval = DtoArgument(fnarg, static_cast<Expression*>(arguments->data[i]));
LLValue* arg = argval->getRVal();
// FIXME: do we need any param attrs here ?
++argiter;
args.push_back(arg);
}
}
}
#if 0
if (Logger::enabled())
{
Logger::println("%lu params passed", args.size());
for (int i=0; i<args.size(); ++i) {
assert(args[i]);
Logger::cout() << "arg["<<i<<"] = " << *args[i] << '\n';
}
}
#endif
// void returns cannot not be named
const char* varname = "";
if (callableTy->getReturnType() != LLType::getVoidTy(gIR->context()))
varname = "tmp";
#if 0
if (Logger::enabled())
Logger::cout() << "Calling: " << *callable << '\n';
#endif
// call the function
LLCallSite call = gIR->CreateCallOrInvoke(callable, args, varname);
// get return value
LLValue* retllval = (retinptr) ? args[0] : call.getInstruction();
// Ignore ABI for intrinsics
if (tf->linkage != LINKintrinsic && !retinptr)
{
// do abi specific return value fixups
DImValue dretval(tf->next, retllval);
retllval = tf->fty.getRet(tf->next, &dretval);
}
// Hack around LDC assuming structs and static arrays are in memory:
// If the function returns a struct or a static array, and the return
// value is not a pointer to a struct or a static array, store it to
// a stack slot before continuing.
int ty = tf->next->toBasetype()->ty;
if ((ty == Tstruct && !isaPointer(retllval))
#if DMDV2
|| (ty == Tsarray && isaArray(retllval))
#endif
)
{
Logger::println("Storing return value to stack slot");
LLValue* mem = DtoRawAlloca(retllval->getType(), 0);
DtoStore(retllval, mem);
retllval = mem;
}
// repaint the type if necessary
if (resulttype)
{
Type* rbase = stripModifiers(resulttype->toBasetype());
Type* nextbase = stripModifiers(tf->nextOf()->toBasetype());
if (!rbase->equals(nextbase))
{
Logger::println("repainting return value from '%s' to '%s'", tf->nextOf()->toChars(), rbase->toChars());
switch(rbase->ty)
{
case Tarray:
#if DMDV2
if (tf->isref)
retllval = DtoBitCast(retllval, DtoType(rbase->pointerTo()));
else
#endif
retllval = DtoAggrPaint(retllval, DtoType(rbase));
break;
case Tsarray:
// nothing ?
break;
case Tclass:
case Taarray:
case Tpointer:
#if DMDV2
if (tf->isref)
retllval = DtoBitCast(retllval, DtoType(rbase->pointerTo()));
else
#endif
retllval = DtoBitCast(retllval, DtoType(rbase));
break;
default:
// Unfortunately, DMD has quirks resp. bugs with regard to name
// mangling: For voldemort-type functions which return a nested
// struct, the mangled name of the return type changes during
// semantic analysis.
//
// (When the function deco is first computed as part of
// determining the return type deco, its return type part is
// left off to avoid cycles. If mangle/toDecoBuffer is then
// called again for the type, it will pick up the previous
// result and return the full deco string for the nested struct
// type, consisting of both the full mangled function name, and
// the struct identifier.)
//
// Thus, the type merging in stripModifiers does not work
// reliably, and the equality check above can fail even if the
// types only differ in a qualifier.
//
// Because a proper fix for this in the frontend is hard, we
// just carry on and hope that the frontend didn't mess up,
// i.e. that the LLVM types really match up.
//
// An example situation where this case occurs is:
// ---
// auto iota() {
// static struct Result {
// this(int) {}
// inout(Result) test() inout { return cast(inout)Result(0); }
// }
// return Result.init;
// }
// void main() { auto r = iota(); }
// ---
break;
}
if (Logger::enabled())
Logger::cout() << "final return value: " << *retllval << '\n';
}
}
// set calling convention and parameter attributes
#if LDC_LLVM_VER >= 302
llvm::AttrListPtr attrlist = llvm::AttrListPtr::get(llvm::ArrayRef<llvm::AttributeWithIndex>(attrs));
#else
llvm::AttrListPtr attrlist = llvm::AttrListPtr::get(attrs.begin(), attrs.end());
#endif
if (dfnval && dfnval->func)
{
LLFunction* llfunc = llvm::dyn_cast<LLFunction>(dfnval->val);
if (llfunc && llfunc->isIntrinsic()) // override intrinsic attrs
attrlist = llvm::Intrinsic::getAttributes(static_cast<llvm::Intrinsic::ID>(llfunc->getIntrinsicID()));
else
call.setCallingConv(callconv);
}
else
call.setCallingConv(callconv);
call.setAttributes(attrlist);
// if we are returning through a pointer arg
// or if we are returning a reference
// make sure we provide a lvalue back!
if (retinptr
#if DMDV2
|| tf->isref
#endif
)
return new DVarValue(resulttype, retllval);
return new DImValue(resulttype, retllval);
}