[ARM] Use getSymbolPreferLocal() in GetARMGVSymbol

This allows relaxing some relocations to STT_SECTION symbol+offset
instead of emitting a relocation against a symbol.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D131433

Author: arichardson

llvm/lib/Target/ARM/ARMAsmPrinter.cpp

@@ -891,7 +891,7 @@ MCSymbol *ARMAsmPrinter::GetARMGVSymbol(const GlobalValue *GV,
 
     return MCSym;
   } else if (Subtarget->isTargetELF()) {
-    return getSymbol(GV);
+    return getSymbolPreferLocal(*GV);
   }
   llvm_unreachable("unexpected target");
 }

llvm/test/CodeGen/ARM/dso-local-func.ll

@@ -23,7 +23,7 @@ define dso_local ptr @dsolocal_func() nounwind {
 ; PIC-NEXT:     .p2align	2
 ; PIC-NEXT:   @ %bb.1:
 ; PIC-NEXT:   .LCPI0_0:
-; PIC-NEXT:     .long	dsolocal_func-(.LPC0_0+8)
+; PIC-NEXT:     .long	.Ldsolocal_func$local-(.LPC0_0+8)
 ; CHECK-NEXT: .Lfunc_end0:
 ; CHECK-NEXT: 	.size	dsolocal_func, .Lfunc_end0-dsolocal_func
 ; CHECK-NEXT: 	.cantunwind

llvm/test/CodeGen/ARM/elf-preemption.ll

@@ -43,7 +43,7 @@ define ptr @get_dsolocal_var() nounwind {
 ; PIC-NEXT:    .p2align 2
 ; PIC-NEXT:  @ %bb.1:
 ; PIC-NEXT:  .LCPI1_0:
-; PIC-NEXT:    .long dsolocal_var-(.LPC1_0+8)
+; PIC-NEXT:    .long .Ldsolocal_var$local-(.LPC1_0+8)
   ret ptr @dsolocal_var
 }
 
@@ -147,7 +147,7 @@ define dso_local ptr @dsolocal_func() nounwind {
 ; PIC-NEXT:    .p2align 2
 ; PIC-NEXT:  @ %bb.1:
 ; PIC-NEXT:  .LCPI6_0:
-; PIC-NEXT:    .long dsolocal_func-(.LPC6_0+8)
+; PIC-NEXT:    .long .Ldsolocal_func$local-(.LPC6_0+8)
   ret ptr @dsolocal_func
 }
 
@@ -185,7 +185,7 @@ define dso_local void @call_dsolocal_func() nounwind {
 ; PIC:       @ %bb.0:
 ; PIC-NEXT:    .save {r11, lr}
 ; PIC-NEXT:    push {r11, lr}
-; PIC-NEXT:    bl dsolocal_func
+; PIC-NEXT:    bl .Ldsolocal_func$local
 ; PIC-NEXT:    pop {r11, pc}
   call ptr @dsolocal_func()
   ret void

llvm/test/CodeGen/ARM/thumb-function-section-reloc.ll

@@ -17,11 +17,11 @@
 ; RELOCS-NEXT:     0x0 R_ARM_PREL31 .text._ZdlPv
 ; RELOCS-NEXT:   }
 ; RELOCS-NEXT:   Section (7) .rel.text.test {
-; RELOCS-NEXT:     0x4 R_ARM_CALL _ZdlPv
+; RELOCS-NEXT:     0x4 R_ARM_CALL .L_ZdlPv$local
 ; FIXME: these two relocation should not be against the section!
 ; RELOCS-NEXT:     0xC R_ARM_ABS32 .text._ZdlPv
 ; RELOCS-NEXT:     0x10 R_ARM_ABS32 .text._ZdlPv
-; RELOCS-NEXT:     0x1C R_ARM_REL32 _ZdlPv
+; RELOCS-NEXT:     0x1C R_ARM_REL32 .L_ZdlPv$local
 ; RELOCS-NEXT:   }
 ; RELOCS-NEXT:   Section (9) .rel.ARM.exidx.text.test {
 ; RELOCS-NEXT:     0x0 R_ARM_PREL31 .text.test
@@ -32,17 +32,18 @@
 ; RELOCS-NEXT: ]
 
 ; RELOCS-LABEL: Symbols [
-; RELOCS: Symbol {
-; FIXME: we should include the symbol in the symbol table!
-; RELOCS-NOT:    Name: .L_ZdlPv$local
-; RELOCS-TODO:   Name: .L_ZdlPv$local
+; RELOCS:      Symbol {
+; RELOCS:        Name: .L_ZdlPv$local
 ; RELOCS-TODO:   Value: 0x1
+; RELOCS-NEXT:   Value: 0x0
 ; RELOCS-TODO:   Size: 2
-; RELOCS-TODO:   Binding: Local (0x0)
+; RELOCS-NEXT:   Size: 0
+; RELOCS-NEXT:   Binding: Local (0x0)
 ; RELOCS-TODO:   Type: Function (0x2)
-; RELOCS-TODO:   Other: 0
-; RELOCS-TODO:   Section: .text._ZdlPv (
-; RELOCS-TODO: }
+; RELOCS-NEXT:   Type: None (0x0)
+; RELOCS-NEXT:   Other: 0
+; RELOCS-NEXT:   Section: .text._ZdlPv (
+; RELOCS-NEXT: }
 
 define dso_local void @_ZdlPv(ptr %ptr) local_unnamed_addr nounwind "target-features"="+armv7-a,+thumb-mode" {
 ; CHECK-LABEL: 	.section	.text._ZdlPv,"ax",%progbits
@@ -68,7 +69,7 @@ define ptr @test(ptr %ptr) nounwind {
 ; CHECK:       @ %bb.0: @ %entry
 ; CHECK-NEXT:    .save {r11, lr}
 ; CHECK-NEXT:    push {r11, lr}
-; CHECK-NEXT:    bl _ZdlPv{{$}}
+; CHECK-NEXT:    bl .L_ZdlPv$local
 ; CHECK-NEXT:    ldr r0, .LCPI1_0
 ; CHECK-NEXT:    @APP
 ; CHECK-NEXT:    .long .L_ZdlPv$local
@@ -84,7 +85,7 @@ define ptr @test(ptr %ptr) nounwind {
 ; CHECK-NEXT:    .p2align 2
 ; CHECK-NEXT:  @ %bb.1:
 ; CHECK-NEXT:  .LCPI1_0:
-; CHECK-NEXT:    .long _ZdlPv-(.LPC1_0+8)
+; CHECK-NEXT:    .long .L_ZdlPv$local-(.LPC1_0+8)
 entry:
   call void @_ZdlPv(ptr %ptr)
   ; This inline assembly is needed to highlight the missing Thumb LSB since