maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

IRgen support for alias of global variable. 

- PR3818.

llvm-svn: 67297
This commit is contained in:
Daniel Dunbar 2009-03-19 08:27:24 +00:00
parent 8d6ab2afa6
commit 4e004ed124
3 changed files with 23 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
clang/lib/CodeGen/CodeGenModule.cpp
View File

@ -369,7 +369,7 @@ void CodeGenModule::SetFunctionAttributes(const FunctionDecl *FD,
void CodeGenModule::EmitAliases() { void CodeGenModule::EmitAliases() {
for (unsigned i = 0, e = Aliases.size(); i != e; ++i) { 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>(); const AliasAttr *AA = D->getAttr<AliasAttr>();
// This is something of a hack, if the FunctionDecl got overridden // This is something of a hack, if the FunctionDecl got overridden
@ -380,7 +380,7 @@ void CodeGenModule::EmitAliases() {
continue; continue;
const std::string& aliaseeName = AA->getAliasee(); const std::string& aliaseeName = AA->getAliasee();
llvm::Function *aliasee = getModule().getFunction(aliaseeName); llvm::GlobalValue *aliasee = getModule().getNamedValue(aliaseeName);
if (!aliasee) { if (!aliasee) {
// FIXME: This isn't unsupported, this is just an error, which // FIXME: This isn't unsupported, this is just an error, which
// sema should catch, but... // sema should catch, but...
@ -539,16 +539,14 @@ bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
} }
void CodeGenModule::EmitGlobal(const ValueDecl *Global) { void CodeGenModule::EmitGlobal(const ValueDecl *Global) {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
// Aliases are deferred until code for everything else has been // Aliases are deferred until code for everything else has been
// emitted. // emitted.
if (FD->getAttr<AliasAttr>()) { if (Global->getAttr<AliasAttr>()) {
assert(!FD->isThisDeclarationADefinition() && Aliases.push_back(Global);
"Function alias cannot have a definition!");
Aliases.push_back(FD);
return; return;
} }
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Global)) {
// Forward declarations are emitted lazily on first use. // Forward declarations are emitted lazily on first use.
if (!FD->isThisDeclarationADefinition()) if (!FD->isThisDeclarationADefinition())
return; return;

2
clang/lib/CodeGen/CodeGenModule.h
View File

@ -109,7 +109,7 @@ class CodeGenModule : public BlockModule {
/// Aliases - List of aliases in module. These cannot be emitted until all the /// 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 /// code has been seen, as they reference things by name instead of directly
/// and may reference forward. /// and may reference forward.
std::vector<const FunctionDecl*> Aliases; std::vector<const ValueDecl*> Aliases;
/// DeferredDecls - List of decls for which code generation has been /// DeferredDecls - List of decls for which code generation has been
/// deferred. When the translation unit has been fully processed we /// deferred. When the translation unit has been fully processed we

13
clang/test/CodeGen/alias.c Normal file
View File

@ -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")));