IRgen support for alias of global variable.
- PR3818.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67297 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index aed0676..cc460c5 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -369,7 +369,7 @@
void CodeGenModule::EmitAliases() {
for (unsigned i = 0, e = Aliases.size(); i != e; ++i) {
- const FunctionDecl *D = Aliases[i];
+ const ValueDecl *D = Aliases[i];
const AliasAttr *AA = D->getAttr<AliasAttr>();
// This is something of a hack, if the FunctionDecl got overridden
@@ -380,7 +380,7 @@
continue;
const std::string& aliaseeName = AA->getAliasee();
- llvm::Function *aliasee = getModule().getFunction(aliaseeName);
+ llvm::GlobalValue *aliasee = getModule().getNamedValue(aliaseeName);
if (!aliasee) {
// FIXME: This isn't unsupported, this is just an error, which
// sema should catch, but...
@@ -539,16 +539,14 @@
}
void CodeGenModule::EmitGlobal(const ValueDecl *Global) {
- if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
- // Aliases are deferred until code for everything else has been
- // emitted.
- if (FD->getAttr<AliasAttr>()) {
- assert(!FD->isThisDeclarationADefinition() &&
- "Function alias cannot have a definition!");
- Aliases.push_back(FD);
- return;
- }
+ // Aliases are deferred until code for everything else has been
+ // emitted.
+ if (Global->getAttr<AliasAttr>()) {
+ Aliases.push_back(Global);
+ return;
+ }
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
// Forward declarations are emitted lazily on first use.
if (!FD->isThisDeclarationADefinition())
return;
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index c3a84af..12c103b 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -109,7 +109,7 @@
/// Aliases - List of aliases in module. These cannot be emitted until all the
/// code has been seen, as they reference things by name instead of directly
/// and may reference forward.
- std::vector<const FunctionDecl*> Aliases;
+ std::vector<const ValueDecl*> Aliases;
/// DeferredDecls - List of decls for which code generation has been
/// deferred. When the translation unit has been fully processed we
diff --git a/test/CodeGen/alias.c b/test/CodeGen/alias.c
new file mode 100644
index 0000000..a625b6a
--- /dev/null
+++ b/test/CodeGen/alias.c
@@ -0,0 +1,13 @@
+// RUN: clang -triple i386-pc-linux-gnu -emit-llvm -o %t %s &&
+// RUN: grep '@g0 = common global i32 0' %t &&
+// RUN: grep '@f1 = alias void ()\* @f0' %t &&
+// RUN: grep '@g1 = alias i32\* @g0' %t &&
+// RUN: grep 'define void @f0() nounwind {' %t
+
+void f0(void) { }
+extern void f1(void);
+extern void f1(void) __attribute((alias("f0")));
+
+int g0;
+extern int g1;
+extern int g1 __attribute((alias("g0")));