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AsmParser: Make the code for parsing unnamed aliases more closely resemble that for unnamed globals.

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This fixes parsing of forward references to unnamed aliases.

While here, remove an unnecessary isa check.

llvm-svn: 254054
This commit is contained in:
Peter Collingbourne 2015-11-25 02:54:07 +00:00
parent 03ec0b37d7
commit 3ca337d5d9
3 changed files with 30 additions and 21 deletions
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45
lib/AsmParser/LLParser.cpp
View File

@ -713,6 +713,24 @@ bool LLParser::ParseAlias(const std::string &Name, LocTy NameLoc, unsigned L,
ExplicitTypeLoc,
"explicit pointee type doesn't match operand's pointee type");
GlobalValue *GVal = nullptr;
// See if the alias was forward referenced, if so, prepare to replace the
// forward reference.
if (!Name.empty()) {
GVal = M->getNamedValue(Name);
if (GVal) {
if (!ForwardRefVals.erase(Name))
return Error(NameLoc, "redefinition of global '@" + Name + "'");
}
} else {
auto I = ForwardRefValIDs.find(NumberedVals.size());
if (I != ForwardRefValIDs.end()) {
GVal = I->second.first;
ForwardRefValIDs.erase(I);
}
}
// Okay, create the alias but do not insert it into the module yet.
std::unique_ptr<GlobalAlias> GA(
GlobalAlias::create(Ty, AddrSpace, (GlobalValue::LinkageTypes)Linkage,
@ -725,26 +743,17 @@ bool LLParser::ParseAlias(const std::string &Name, LocTy NameLoc, unsigned L,
if (Name.empty())
NumberedVals.push_back(GA.get());
// See if this value already exists in the symbol table. If so, it is either
// a redefinition or a definition of a forward reference.
if (GlobalValue *Val = M->getNamedValue(Name)) {
// See if this was a redefinition. If so, there is no entry in
// ForwardRefVals.
auto I = ForwardRefVals.find(Name);
if (I == ForwardRefVals.end())
return Error(NameLoc, "redefinition of global named '@" + Name + "'");
// Otherwise, this was a definition of forward ref. Verify that types
// agree.
if (Val->getType() != GA->getType())
return Error(NameLoc,
"forward reference and definition of alias have different types");
if (GVal) {
// Verify that types agree.
if (GVal->getType() != GA->getType())
return Error(
ExplicitTypeLoc,
"forward reference and definition of alias have different types");
// If they agree, just RAUW the old value with the alias and remove the
// forward ref info.
Val->replaceAllUsesWith(GA.get());
Val->eraseFromParent();
ForwardRefVals.erase(I);
GVal->replaceAllUsesWith(GA.get());
GVal->eraseFromParent();
}
// Insert into the module, we know its name won't collide now.
@ -809,7 +818,7 @@ bool LLParser::ParseGlobal(const std::string &Name, LocTy NameLoc,
if (!Name.empty()) {
GVal = M->getNamedValue(Name);
if (GVal) {
if (!ForwardRefVals.erase(Name) || !isa<GlobalValue>(GVal))
if (!ForwardRefVals.erase(Name))
return Error(NameLoc, "redefinition of global '@" + Name + "'");
}
} else {

2
test/Assembler/alias-redefinition.ll
View File

@ -1,6 +1,6 @@
; RUN: not llvm-as %s 2>&1 | FileCheck %s
; CHECK: error: redefinition of global named '@bar'
; CHECK: error: redefinition of global '@bar'
@foo = global i32 0
@bar = alias i32, i32* @foo

4
test/Assembler/unnamed-alias.ll
View File

@ -5,7 +5,7 @@
@1 = private constant i32 1
; CHECK: @1 = private constant i32 1
@2 = private alias i32, i32* @0
; CHECK: @2 = private alias i32, i32* @0
@2 = private alias i32, i32* @3
; CHECK: @2 = private alias i32, i32* @3
@3 = private alias i32, i32* @1
; CHECK: @3 = private alias i32, i32* @1