[PATCH] D25461: LTO: Don't follow lazy references when seeing new definitions in the combined LTO object
Hans Wennborg via llvm-commits
llvm-commits at lists.llvm.org
Wed Oct 12 02:14:34 PDT 2016
This revision was automatically updated to reflect the committed changes.
Closed by commit rL283989: LTO: Don't follow lazy references when seeing new definitions in the combined… (authored by hans).
Changed prior to commit:
https://reviews.llvm.org/D25461?vs=74200&id=74343#toc
Repository:
rL LLVM
https://reviews.llvm.org/D25461
Files:
lld/trunk/COFF/SymbolTable.cpp
lld/trunk/test/COFF/Inputs/lto-lazy-reference-dummy.ll
lld/trunk/test/COFF/Inputs/lto-lazy-reference-quadruple.ll
lld/trunk/test/COFF/lto-lazy-reference.ll
Index: lld/trunk/test/COFF/lto-lazy-reference.ll
===================================================================
--- lld/trunk/test/COFF/lto-lazy-reference.ll
+++ lld/trunk/test/COFF/lto-lazy-reference.ll
@@ -0,0 +1,21 @@
+; RUN: llc -mtriple=i686-pc-windows-msvc -filetype=obj -o %T/lto-lazy-reference-quadruple.obj %S/Inputs/lto-lazy-reference-quadruple.ll
+; RUN: llvm-as -o %T/lto-lazy-reference-dummy.bc %S/Inputs/lto-lazy-reference-dummy.ll
+; RUN: rm -f %t.lib
+; RUN: llvm-ar cru %t.lib %T/lto-lazy-reference-quadruple.obj %T/lto-lazy-reference-dummy.bc
+; RUN: llvm-as -o %t.obj %s
+; RUN: lld-link /out:%t.exe /entry:main /subsystem:console %t.obj %t.lib
+
+target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
+target triple = "i686-pc-windows-msvc18.0.0"
+
+define double @main(double %x) {
+entry:
+ ; When compiled, this defines the __real at 40800000 symbol, which already has a
+ ; lazy definition in the lib file from lto-lazy-reference-quadruple.obj. This
+ ; test makes sure we *don't* try to take the definition from the lazy
+ ; reference, because that can bring in new references to bitcode files after
+ ; LTO, such as lto-lazy-reference-dummy.bc in this case.
+ %mul = fmul double %x, 4.0
+
+ ret double %mul
+}
Index: lld/trunk/test/COFF/Inputs/lto-lazy-reference-quadruple.ll
===================================================================
--- lld/trunk/test/COFF/Inputs/lto-lazy-reference-quadruple.ll
+++ lld/trunk/test/COFF/Inputs/lto-lazy-reference-quadruple.ll
@@ -0,0 +1,16 @@
+target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
+target triple = "i686-pc-windows-msvc18.0.0"
+
+define double @quadruple(double %x) {
+entry:
+ ; The symbol __real at 40800000 is used to materialize the 4.0 constant.
+ %mul = fmul double %x, 4.0
+ ret double %mul
+}
+
+
+declare void @dummy()
+define void @f() {
+ call void @dummy()
+ ret void
+}
Index: lld/trunk/test/COFF/Inputs/lto-lazy-reference-dummy.ll
===================================================================
--- lld/trunk/test/COFF/Inputs/lto-lazy-reference-dummy.ll
+++ lld/trunk/test/COFF/Inputs/lto-lazy-reference-dummy.ll
@@ -0,0 +1,6 @@
+target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
+target triple = "i686-pc-windows-msvc18.0.0"
+
+define void @dummy() {
+ ret void
+}
Index: lld/trunk/COFF/SymbolTable.cpp
===================================================================
--- lld/trunk/COFF/SymbolTable.cpp
+++ lld/trunk/COFF/SymbolTable.cpp
@@ -347,11 +347,13 @@
Sym->Body = Body;
continue;
}
- if (auto *L = dyn_cast<Lazy>(Existing)) {
- // We may see new references to runtime library symbols such as __chkstk
- // here. These symbols must be wholly defined in non-bitcode files.
- addMemberFile(L);
- continue;
+ if (isa<Undefined>(Body)) {
+ if (auto *L = dyn_cast<Lazy>(Existing)) {
+ // We may see new references to runtime library symbols such as __chkstk
+ // here. These symbols must be wholly defined in non-bitcode files.
+ addMemberFile(L);
+ continue;
+ }
}
int Comp = Existing->compare(Body);
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