Re-apply r278065 (Weak symbol support in RuntimeDyld) with a fix for ELF.
llvm-svn: 278149
diff --git a/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h b/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
index 805852b..db9c519 100644
--- a/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
+++ b/llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h
@@ -116,11 +116,13 @@
LinkingResolver(OrcMCJITReplacement &M) : M(M) {}
JITSymbol findSymbol(const std::string &Name) override {
- return M.findMangledSymbol(Name);
+ return M.ClientResolver->findSymbol(Name);
}
JITSymbol findSymbolInLogicalDylib(const std::string &Name) override {
- return M.ClientResolver->findSymbol(Name);
+ if (auto Sym = M.findMangledSymbol(Name))
+ return Sym;
+ return M.ClientResolver->findSymbolInLogicalDylib(Name);
}
private:
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
index 1770525..0c69b1a 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -226,6 +226,24 @@
// Compute JIT symbol flags.
JITSymbolFlags JITSymFlags = JITSymbolFlags::fromObjectSymbol(*I);
+ // If this is a weak definition, check to see if there's a strong one.
+ // If there is, skip this symbol (we won't be providing it: the strong
+ // definition will). If there's no strong definition, make this definition
+ // strong.
+ if (JITSymFlags.isWeak()) {
+ // First check whether there's already a definition in this instance.
+ // FIXME: Override existing weak definitions with strong ones.
+ if (GlobalSymbolTable.count(Name))
+ continue;
+ // Then check the symbol resolver to see if there's a definition
+ // elsewhere in this logical dylib.
+ if (auto Sym = Resolver.findSymbolInLogicalDylib(Name))
+ if (Sym.getFlags().isStrongDefinition())
+ continue;
+ // else
+ JITSymFlags &= ~JITSymbolFlags::Weak;
+ }
+
if (Flags & SymbolRef::SF_Absolute &&
SymType != object::SymbolRef::ST_File) {
uint64_t Addr = 0;
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
index 0f0ef99..6929732 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
@@ -1258,6 +1258,7 @@
break;
}
case SymbolRef::ST_Data:
+ case SymbolRef::ST_Function:
case SymbolRef::ST_Unknown: {
Value.SymbolName = TargetName.data();
Value.Addend = Addend;
diff --git a/llvm/test/ExecutionEngine/MCJIT/Inputs/weak-function-2.ll b/llvm/test/ExecutionEngine/MCJIT/Inputs/weak-function-2.ll
new file mode 100644
index 0000000..a7ff83d
--- /dev/null
+++ b/llvm/test/ExecutionEngine/MCJIT/Inputs/weak-function-2.ll
@@ -0,0 +1,9 @@
+define linkonce_odr i32 @baz() #0 {
+entry:
+ ret i32 0
+}
+
+define i8* @bar() {
+entry:
+ ret i8* bitcast (i32 ()* @baz to i8*)
+}
diff --git a/llvm/test/ExecutionEngine/MCJIT/weak-function.ll b/llvm/test/ExecutionEngine/MCJIT/weak-function.ll
new file mode 100644
index 0000000..562d6ad
--- /dev/null
+++ b/llvm/test/ExecutionEngine/MCJIT/weak-function.ll
@@ -0,0 +1,26 @@
+; RUN: lli -jit-kind=mcjit -extra-module %p/Inputs/weak-function-2.ll %s
+;
+; Check that functions in two different modules agree on the address of weak
+; function 'baz'
+
+define linkonce_odr i32 @baz() {
+entry:
+ ret i32 0
+}
+
+define i8* @foo() {
+entry:
+ ret i8* bitcast (i32 ()* @baz to i8*)
+}
+
+declare i8* @bar()
+
+define i32 @main(i32 %argc, i8** %argv) {
+entry:
+ %call = tail call i8* @foo()
+ %call1 = tail call i8* @bar()
+ %cmp = icmp ne i8* %call, %call1
+ %conv = zext i1 %cmp to i32
+ ret i32 %conv
+}
+
diff --git a/llvm/test/ExecutionEngine/OrcMCJIT/Inputs/weak-function-2.ll b/llvm/test/ExecutionEngine/OrcMCJIT/Inputs/weak-function-2.ll
new file mode 100644
index 0000000..a7ff83d
--- /dev/null
+++ b/llvm/test/ExecutionEngine/OrcMCJIT/Inputs/weak-function-2.ll
@@ -0,0 +1,9 @@
+define linkonce_odr i32 @baz() #0 {
+entry:
+ ret i32 0
+}
+
+define i8* @bar() {
+entry:
+ ret i8* bitcast (i32 ()* @baz to i8*)
+}
diff --git a/llvm/test/ExecutionEngine/OrcMCJIT/weak-function.ll b/llvm/test/ExecutionEngine/OrcMCJIT/weak-function.ll
new file mode 100644
index 0000000..db255cd
--- /dev/null
+++ b/llvm/test/ExecutionEngine/OrcMCJIT/weak-function.ll
@@ -0,0 +1,26 @@
+; RUN: lli -jit-kind=orc-mcjit -extra-module %p/Inputs/weak-function-2.ll %s
+;
+; Check that functions in two different modules agree on the address of weak
+; function 'baz'
+
+define linkonce_odr i32 @baz() {
+entry:
+ ret i32 0
+}
+
+define i8* @foo() {
+entry:
+ ret i8* bitcast (i32 ()* @baz to i8*)
+}
+
+declare i8* @bar()
+
+define i32 @main(i32 %argc, i8** %argv) {
+entry:
+ %call = tail call i8* @foo()
+ %call1 = tail call i8* @bar()
+ %cmp = icmp ne i8* %call, %call1
+ %conv = zext i1 %cmp to i32
+ ret i32 %conv
+}
+