[PATCH] D35809: [LTO] Make sure symbol ordering is honoured
Davide Italiano via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 24 11:20:00 PDT 2017
davide created this revision.
Herald added subscribers: inglorion, emaste.
We do this emitting a section for every function when LTO is used.
See the discussion in https://bugs.llvm.org/show_bug.cgi?id=33888
I'll follow up with a similar change to the gold plugin. Other formats can probably do the same.
https://reviews.llvm.org/D35809
Files:
ELF/LTO.cpp
test/ELF/lto/Inputs/symbol-ordering-lto.ll
test/ELF/lto/symbol-ordering-lto.s
Index: test/ELF/lto/symbol-ordering-lto.s
===================================================================
--- /dev/null
+++ test/ELF/lto/symbol-ordering-lto.s
@@ -0,0 +1,25 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-scei-ps4 %s -o %t.o
+# RUN: llvm-as %p/Inputs/symbol-ordering-lto.ll -o %t.bc
+
+# Set up the symbol file
+# RUN: echo "tin " > %t_order_lto.txt
+# RUN: echo "_start " >> %t_order_lto.txt
+# RUN: echo "pat " >> %t_order_lto.txt
+
+# RUN: ld.lld --symbol-ordering-file %t_order_lto.txt %t.o %t.bc -o %t2.out
+# RUN: llvm-readobj -elf-output-style=GNU -t %t2.out| FileCheck %s
+
+# Check that the order is pat -> _start -> tin.
+
+# CHECK: Symbol table '.symtab' contains 4 entries:
+# CHECK-NEXT: Num: Value Size Type Bind Vis Ndx Name
+# CHECK-NEXT: 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
+# CHECK-NEXT: 1: 0000000000201008 0 NOTYPE GLOBAL DEFAULT 1 _start
+# CHECK-NEXT: 2: 0000000000201020 6 FUNC GLOBAL DEFAULT 1 pat
+# CHECK-NEXT: 3: 0000000000201000 6 FUNC GLOBAL DEFAULT 1 tin
+
+.globl _start
+_start:
+ call pat
+ call tin
Index: test/ELF/lto/Inputs/symbol-ordering-lto.ll
===================================================================
--- /dev/null
+++ test/ELF/lto/Inputs/symbol-ordering-lto.ll
@@ -0,0 +1,10 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-scei-ps4"
+
+define i32 @tin() {
+ ret i32 22
+}
+
+define i32 @pat() {
+ ret i32 42
+}
Index: ELF/LTO.cpp
===================================================================
--- ELF/LTO.cpp
+++ ELF/LTO.cpp
@@ -73,6 +73,9 @@
Conf.Options = InitTargetOptionsFromCodeGenFlags();
Conf.Options.RelaxELFRelocations = true;
+ // Always emit a section per function with LTO.
+ Conf.Options.FunctionSections = true;
+
if (Config->Relocatable)
Conf.RelocModel = None;
else if (Config->Pic)
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