void vaCopy(LLValue* pDest, LLValue* src) {
// Analog to va_start, we need to allocate a new __va_list struct on the stack,
// fill it with a bitcopy of the source struct...
src = DtoLoad(DtoBitCast(src, getValistType()->getPointerTo())); // *(__va_list*)src
LLValue* valistmem = DtoAllocaDump(src, 0, "__va_list_mem");
// ... and finally set the passed 'dest' char* pointer to the new struct's address.
DtoStore(DtoBitCast(valistmem, getVoidPtrType()),
DtoBitCast(pDest, getPtrToType(getVoidPtrType())));
}
LLValue *get(Type *dty, LLValue *v) override {
LLValue *address = DtoAllocaDump(v, dty, ".X86_64_C_struct_rewrite_dump");
LLType *type = DtoType(dty);
return loadFromMemory(address, type, ".X86_64_C_struct_rewrite_getResult");
}
void CompoundAsmStatement_toIR(CompoundAsmStatement *stmt, IRState *p) {
IF_LOG Logger::println("CompoundAsmStatement::toIR(): %s",
stmt->loc.toChars());
LOG_SCOPE;
// disable inlining by default
if (!p->func()->decl->allowInlining) {
p->func()->setNeverInline();
}
// create asm block structure
assert(!p->asmBlock);
auto asmblock = new IRAsmBlock(stmt);
assert(asmblock);
p->asmBlock = asmblock;
// do asm statements
for (unsigned i = 0; i < stmt->statements->dim; i++) {
if (Statement *s = (*stmt->statements)[i]) {
Statement_toIR(s, p);
}
}
// build forwarder for in-asm branches to external labels
// this additional asm code sets the __llvm_jump_target variable
// to a unique value that will identify the jump target in
// a post-asm switch
// maps each goto destination to its special value
std::map<LabelDsymbol *, int> gotoToVal;
// location of the special value determining the goto label
// will be set if post-asm dispatcher block is needed
LLValue *jump_target = nullptr;
{
FuncDeclaration *fd = gIR->func()->decl;
OutBuffer mangleBuf;
mangleToBuffer(fd, &mangleBuf);
const char *fdmangle = mangleBuf.peekString();
// we use a simple static counter to make sure the new end labels are unique
static size_t uniqueLabelsId = 0;
std::ostringstream asmGotoEndLabel;
printLabelName(asmGotoEndLabel, fdmangle, "_llvm_asm_end");
asmGotoEndLabel << uniqueLabelsId++;
// initialize the setter statement we're going to build
auto outSetterStmt = new IRAsmStmt;
std::string asmGotoEnd = "\n\tjmp " + asmGotoEndLabel.str() + "\n";
std::ostringstream code;
code << asmGotoEnd;
int n_goto = 1;
size_t n = asmblock->s.size();
for (size_t i = 0; i < n; ++i) {
IRAsmStmt *a = asmblock->s[i];
// skip non-branch statements
if (!a->isBranchToLabel) {
continue;
}
// if internal, no special handling is necessary, skip
std::vector<Identifier *>::const_iterator it, end;
end = asmblock->internalLabels.end();
bool skip = false;
for (auto il : asmblock->internalLabels) {
if (il->equals(a->isBranchToLabel->ident)) {
skip = true;
}
}
if (skip) {
continue;
}
// if we already set things up for this branch target, skip
if (gotoToVal.find(a->isBranchToLabel) != gotoToVal.end()) {
continue;
}
// record that the jump needs to be handled in the post-asm dispatcher
gotoToVal[a->isBranchToLabel] = n_goto;
// provide an in-asm target for the branch and set value
IF_LOG Logger::println(
"statement '%s' references outer label '%s': creating forwarder",
a->code.c_str(), a->isBranchToLabel->ident->toChars());
printLabelName(code, fdmangle, a->isBranchToLabel->ident->toChars());
code << ":\n\t";
code << "movl $<<in" << n_goto << ">>, $<<out0>>\n";
// FIXME: Store the value -> label mapping somewhere, so it can be
// referenced later
outSetterStmt->in.push_back(DtoConstUint(n_goto));
outSetterStmt->in_c += "i,";
code << asmGotoEnd;
++n_goto;
}
if (code.str() != asmGotoEnd) {
// finalize code
outSetterStmt->code = code.str();
outSetterStmt->code += asmGotoEndLabel.str() + ":\n";
// create storage for and initialize the temporary
jump_target = DtoAllocaDump(DtoConstUint(0), 0, "__llvm_jump_target");
// setup variable for output from asm
outSetterStmt->out_c = "=*m,";
outSetterStmt->out.push_back(jump_target);
asmblock->s.push_back(outSetterStmt);
} else {
delete outSetterStmt;
}
}
// build a fall-off-end-properly asm statement
FuncDeclaration *thisfunc = p->func()->decl;
bool useabiret = false;
p->asmBlock->asmBlock->abiret = nullptr;
if (thisfunc->fbody->endsWithAsm() == stmt &&
thisfunc->type->nextOf()->ty != Tvoid) {
// there can't be goto forwarders in this case
assert(gotoToVal.empty());
emitABIReturnAsmStmt(asmblock, stmt->loc, thisfunc);
useabiret = true;
}
// build asm block
std::vector<LLValue *> outargs;
std::vector<LLValue *> inargs;
std::vector<LLType *> outtypes;
std::vector<LLType *> intypes;
std::string out_c;
std::string in_c;
std::string clobbers;
std::string code;
size_t asmIdx = asmblock->retn;
Logger::println("do outputs");
size_t n = asmblock->s.size();
for (size_t i = 0; i < n; ++i) {
IRAsmStmt *a = asmblock->s[i];
assert(a);
size_t onn = a->out.size();
for (size_t j = 0; j < onn; ++j) {
outargs.push_back(a->out[j]);
outtypes.push_back(a->out[j]->getType());
}
if (!a->out_c.empty()) {
out_c += a->out_c;
}
remap_outargs(a->code, onn + a->in.size(), asmIdx);
asmIdx += onn;
}
Logger::println("do inputs");
for (size_t i = 0; i < n; ++i) {
IRAsmStmt *a = asmblock->s[i];
assert(a);
size_t inn = a->in.size();
for (size_t j = 0; j < inn; ++j) {
inargs.push_back(a->in[j]);
intypes.push_back(a->in[j]->getType());
}
if (!a->in_c.empty()) {
in_c += a->in_c;
}
remap_inargs(a->code, inn + a->out.size(), asmIdx);
asmIdx += inn;
if (!code.empty()) {
code += "\n\t";
}
code += a->code;
}
asmblock->s.clear();
// append inputs
out_c += in_c;
// append clobbers
for (const auto &c : asmblock->clobs) {
out_c += c;
}
// remove excessive comma
if (!out_c.empty()) {
out_c.resize(out_c.size() - 1);
}
IF_LOG {
Logger::println("code = \"%s\"", code.c_str());
Logger::println("constraints = \"%s\"", out_c.c_str());
}
// build return types
LLType *retty;
if (asmblock->retn) {
retty = asmblock->retty;
} else {
retty = llvm::Type::getVoidTy(gIR->context());
}
// build argument types
std::vector<LLType *> types;
types.insert(types.end(), outtypes.begin(), outtypes.end());
types.insert(types.end(), intypes.begin(), intypes.end());
llvm::FunctionType *fty = llvm::FunctionType::get(retty, types, false);
IF_LOG Logger::cout() << "function type = " << *fty << '\n';
std::vector<LLValue *> args;
args.insert(args.end(), outargs.begin(), outargs.end());
args.insert(args.end(), inargs.begin(), inargs.end());
IF_LOG {
Logger::cout() << "Arguments:" << '\n';
Logger::indent();
size_t i = 0;
for (auto arg : args) {
Stream cout = Logger::cout();
cout << '$' << i << " ==> " << *arg;
if (!llvm::isa<llvm::Instruction>(arg) &&
!llvm::isa<LLGlobalValue>(arg)) {
cout << '\n';
}
++i;
}
Logger::undent();
}
llvm::InlineAsm *ia = llvm::InlineAsm::get(fty, code, out_c, true);
llvm::CallInst *call = p->ir->CreateCall(
ia, args, retty == LLType::getVoidTy(gIR->context()) ? "" : "asm");
IF_LOG Logger::cout() << "Complete asm statement: " << *call << '\n';
// capture abi return value
if (useabiret) {
IRAsmBlock *block = p->asmBlock;
if (block->retfixup) {
block->asmBlock->abiret = (*block->retfixup)(p->ir, call);
} else if (p->asmBlock->retemu) {
block->asmBlock->abiret = DtoLoad(block->asmBlock->abiret);
} else {
block->asmBlock->abiret = call;
}
}
p->asmBlock = nullptr;
// if asm contained external branches, emit goto forwarder code
if (!gotoToVal.empty()) {
assert(jump_target);
// make new blocks
llvm::BasicBlock *bb = p->insertBB("afterasmgotoforwarder");
llvm::LoadInst *val =
p->ir->CreateLoad(jump_target, "__llvm_jump_target_value");
llvm::SwitchInst *sw = p->ir->CreateSwitch(val, bb, gotoToVal.size());
// add all cases
for (const auto &pair : gotoToVal) {
llvm::BasicBlock *casebb = p->insertBBBefore(bb, "case");
sw->addCase(LLConstantInt::get(llvm::IntegerType::get(gIR->context(), 32),
pair.second),
casebb);
p->scope() = IRScope(casebb);
DtoGoto(stmt->loc, pair.first);
}
p->scope() = IRScope(bb);
}
}
LLValue *getLVal(Type *dty, LLValue *v) override {
return DtoAllocaDump(v, dty, ".X86_64_C_struct_rewrite_dump");
}
