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Make global aliases have symbol size equal to their type

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This is mainly for the benefit of GlobalMerge, so that an alias into a
MergedGlobals variable has the same size as the original non-merged
variable.

Differential Revision: http://reviews.llvm.org/D10837


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242520 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Brawn 2015-07-17 12:12:03 +00:00
parent fe6ad9692a
commit 591adee23b
4 changed files with 34 additions and 0 deletions
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10
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -1111,6 +1111,16 @@ bool AsmPrinter::doFinalization(Module &M) {
// Emit the directives as assignments aka .set:
OutStreamer->EmitAssignment(Name, lowerConstant(Alias.getAliasee()));
// Set the size of the alias symbol if we can, as otherwise the alias gets
// the size of the aliasee which may not be correct e.g. if the alias is of
// a member of a struct.
if (MAI->hasDotTypeDotSizeDirective() && Alias.getValueType()->isSized()) {
const DataLayout &DL = M.getDataLayout();
uint64_t Size = DL.getTypeAllocSize(Alias.getValueType());
OutStreamer->emitELFSize(cast<MCSymbolELF>(Name),
MCConstantExpr::create(Size, OutContext));
}
}
GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();

3
test/CodeGen/AArch64/global-merge-2.ll
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@ -35,10 +35,13 @@ define void @g1(i32 %a1, i32 %a2) {
;CHECK: .globl x
;CHECK: x = _MergedGlobals_x
;CHECK: .size x, 4
;CHECK: .globl y
;CHECK: y = _MergedGlobals_x+4
;CHECK: .size y, 4
;CHECK: .globl z
;CHECK: z = _MergedGlobals_x+8
;CHECK: .size z, 4
;CHECK-APPLE-IOS: .globl __MergedGlobals_x ; @_MergedGlobals_x
;CHECK-APPLE-IOS: .zerofill __DATA,__common,__MergedGlobals_x,12,3

2
test/CodeGen/AArch64/global-merge-3.ll
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@ -42,8 +42,10 @@ define void @f1(i32 %a1, i32 %a2, i32 %a3) {
;CHECK: .globl x
;CHECK: x = _MergedGlobals_x+4
;CHECK: .size x, 4000
;CHECK: .globl y
;CHECK: y = _MergedGlobals_y
;CHECK: .size y, 4000
;CHECK-APPLE-IOS:.globl _x
;CHECK-APPLE-IOS: _x = __MergedGlobals_x+4

19
test/CodeGen/ARM/aliases.ll
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@ -2,19 +2,34 @@
; CHECK: .globl test
; CHECK: .globl structvar
; CHECK: .size structvar, 8
; CHECK: .globl foo1
; CHECK: foo1 = bar
; CHECK: .size foo1, 4
; CHECK: .globl foo2
; CHECK: foo2 = bar
; CHECK: .size foo2, 4
; CHECK: .weak bar_f
; CHECK: bar_f = foo_f
; CHECK: bar_i = bar
; CHECK: .size bar_i, 4
; CHECK: .globl A
; CHECK: A = bar
; CHECK: .size A, 8
; CHECK: .globl elem0
; CHECK: elem0 = structvar
; CHECK: .size elem0, 4
; CHECK: .globl elem1
; CHECK: elem1 = structvar+4
; CHECK: .size elem1, 4
@bar = global i32 42
@foo1 = alias i32* @bar
@ -31,6 +46,10 @@ define i32 @foo_f() {
@A = alias bitcast (i32* @bar to i64*)
@structvar = global {i32, i32} {i32 1, i32 2}
@elem0 = alias getelementptr({i32, i32}, {i32, i32}* @structvar, i32 0, i32 0)
@elem1 = alias getelementptr({i32, i32}, {i32, i32}* @structvar, i32 0, i32 1)
define i32 @test() {
entry:
%tmp = load i32, i32* @foo1