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[flang] Fix misc issues with closing of LabelDo 

Original-commit: flang-compiler/f18@8134331da8
Reviewed-on: https://github.com/flang-compiler/f18/pull/24
Tree-same-pre-rewrite: false
This commit is contained in:
Stephane Chauveau 2018-03-07 14:21:01 +01:00 committed by GitHub
parent 10e3b1cfb2
commit b6ae080cd6
2 changed files with 121 additions and 22 deletions
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126
flang/tools/f18/sema-impl.cc
View File

@ -802,6 +802,11 @@ public:
std::map<SMap::Index, const sm::Identifier *> construct_name_ ;
// Set of all labe-DO statement that are still open.
// The key is the LabelDoStmt index
// The value is the required label.
std::map<SMap::Index,int> opened_label_do_;
public:
Scope *EnterScope(Scope *s) {
@ -1001,6 +1006,42 @@ public:
return *current_smap_ ;
}
void OpenLabelDo(SMap::Index dostmt, int label)
{
opened_label_do_[dostmt] = label ;
}
void CloseLabelDo(SMap::Index dostmt)
{
opened_label_do_.erase(dostmt) ;
}
// If stmt is an opened LabelDo, then return its label.
// In all other cases, return 0.
//
// This function can be safely called even if stmt is
// not a LabelStmt
//
int GetLabelOfOpenedLabelDo(SMap::Index stmt)
{
auto it = opened_label_do_.find(stmt);
if ( it != opened_label_do_.end() )
return it->second ;
else
return 0 ;
}
// return true if the specified label matches any currently opened LabelDo
bool MatchAnyOpenedLabelDo(int label)
{
auto smap = GetStatementMap() ;
for (auto it : opened_label_do_ ) {
if ( it.second == label )
return true;
}
return false;
}
bool ValidEndOfLabelDo(StmtClass sclass)
{
@ -1092,10 +1133,12 @@ public:
auto sgroup = StmtClassToGroup(sclass);
if ( smap.Size() >= 1 ) {
// We need to add the statement to the map but before, we have to
// handle the specific case of the LabelDo.
// handle the specific case of the LabelDo.
SMap::Index last = smap.Size();
SMap::Index label_do = SMap::None;
if ( smap.GetGroup(last) == StmtGroup::Single ) {
@ -1105,14 +1148,16 @@ public:
}
if ( label_do != SMap::None ) {
if ( smap.GetClass(label_do) == StmtClass::LabelDo ) {
if ( smap.GetLabelDoLabel(label_do) == sema.stmt_label ) {
if ( GetLabelOfOpenedLabelDo(label_do) == sema.stmt_label ) {
if ( ! ValidEndOfLabelDo(sclass) ) {
FAIL("Statement cannot end a DO label");
} else if ( sclass == StmtClass::EndDo ) {
CloseLabelDo(label_do);
}
} else if ( sclass == StmtClass::EndDo ) {
FAIL("ENDDO label does not match previous DO label");
FAIL("ENDDO label does not match previous DO-label");
} else if ( sgroup==StmtGroup::Part || sgroup==StmtGroup::End ) {
FAIL("Unterminated DO label statement");
FAIL("Unterminated DO-label statement");
}
}
}
@ -1127,36 +1172,71 @@ public:
if (sgroup == StmtGroup::Single || sgroup == StmtGroup::End )
{
SMap::Index s;
if (sgroup == StmtGroup::End)
if (sclass == StmtClass::EndDo )
s = sema.stmt_index ;
else if (sgroup == StmtGroup::End)
s = smap.StartOfConstruct(sema.stmt_index);
else // StmtGroup::Single
s = sema.stmt_index ;
int label = smap.GetLabel(s) ;
if ( label > 0 ) {
// For an enddo, go up one more level because we just
// closed that loop (but there could be more loops to close)
if (sclass == StmtClass::EndDo )
s = smap.StartOfConstruct(s) ;
SMap::Index parent = smap.GetParent(s) ;
// Insert a DummyEndDo for each enclosing LabelDo that
// matches the label of the added statement or construct
while ( parent!= SMap::None &&
( smap.GetClass(parent) == StmtClass::LabelDo ||
smap.GetClass(parent) == StmtClass::LabelDoWhile ||
smap.GetClass(parent) == StmtClass::LabelDoConcurrent
) &&
smap.GetLabelDoLabel(parent)
// Insert a DummyEndDo for each opened LabelDo that
// matches the label of the added statement or construct.
while ( parent != SMap::None &&
//( smap.GetClass(parent) == StmtClass::LabelDo ||
// smap.GetClass(parent) == StmtClass::LabelDoWhile ||
// smap.GetClass(parent) == StmtClass::LabelDoConcurrent
// ) &&
// isAnOpenLabelDo(parent) &&
// smap.GetLabelDoLabel(parent) == label &&
GetLabelOfOpenedLabelDo(parent) == label
)
{
auto name = GetConstructName(parent);
if (name) {
//
// Our DummyEndDo cannot be used to close a named LabelDo.
// For instance, the following is not legal:
// foobar: DO 666 i=1,n
// ...
// 666 CONTINUE
FAIL("Statement #" << sema.stmt_index
<< " is ending the named DO label #"
<< parent) ;
}
smap.Add( StmtClass::DummyEndDo, 0 ) ;
CloseLabelDo(parent) ;
parent = smap.GetParent(parent) ;
}
}
}
// TODO: add a data structure to track all opened 'LabelDo'
// and after inserting the
// If the label of the added statement was supposed to
// close some opened LabelDo then they should be now be
// closed.
//
// Any opened LabelDo matching the added label indicates
// a nesting problem
//
int added_label = smap.GetLabel(sema.stmt_index) ;
if ( added_label ) {
if ( MatchAnyOpenedLabelDo(added_label) ) {
FAIL("Statement with label " << added_label << " is not properly"
" nested to close all corresponding label DO statement");
}
}
return sema;
}
@ -2344,7 +2424,16 @@ public:
// Inform the Statement Map of the required end label.
int end_label = int(std::get<1>(x.t)) ; // TODO: check label is in 1:99999 range
smap.SetLabelDoLabel(sema.stmt_index, end_label) ;
//smap.SetLabelDoLabel(sema.stmt_index, end_label) ;
OpenLabelDo( sema.stmt_index, end_label);
Provenance previous_loc;
if ( GetLabelTable().find(end_label, previous_loc) ) {
// Early fail when the label already exists.
// This is actually optional since a "Duplicate Label" or "a END mismatch" error
// should occur later.
FAIL("Label " << end_label << " required by DO statement is already declared") ;
}
// And also record the construct name
auto name = sm::Identifier::get( std::get<0>(x.t) );
@ -2851,13 +2940,15 @@ public:
// the name of the construct we are looking for (can be null)
const sm::Identifier * target_name = sm::Identifier::get(x.v) ;
// Reminder: Unlike in EXIT, the target of a CYCLE statement is always
// a DO so the target resolution are similar but not identical.
SMap::Index target_do = SMap::None ;
SMap::Index construct = sema.stmt_index ;
// At that point, construct refers to the CYCLE statment which is not a
// construct index (i.e. a Start statement). However, in the loop below,
// it will be assigned a proper construct index.
// Note: At that point, 'construct' refers to the CYCLE statment which
// is not a construct index (i.e. a Start statement). However, in the
// loop below, 'construct' will be assigned a proper construct index.
bool done=false ;
while (!done)
@ -2919,6 +3010,7 @@ public:
case StmtClass::Block:
case StmtClass::Associate:
case StmtClass::WhereConstruct:
// A CYCLE statement can be used to exit those constructs but they are proper targets
break;
case StmtClass::Program:

7
flang/tools/f18/test-sema.cc
View File

@ -54,6 +54,13 @@ int main(int argc, char *const argv[]) {
cooked.Marshal();
ParseState state{cooked};
UserState ustate;
state
//.set_inFixedForm(true)
//.set_strictConformance(false)
.set_userState(&ustate)
;
std::optional<Program> result{program.Parse(&state)};
if (!result.has_value() || state.anyErrorRecovery()) {
std::cerr << "parse FAILED\n";