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llvm-mirror/test/Other/extract-alias.ll
Rafael Espindola c5f7a8c70e Fix most of PR10367.
This patch changes the design of GlobalAlias so that it doesn't take a
ConstantExpr anymore. It now points directly to a GlobalObject, but its type is
independent of the aliasee type.

To avoid changing all alias related tests in this patches, I kept the common
syntax

@foo = alias i32* @bar

to mean the same as now. The cases that used to use cast now use the more
general syntax

@foo = alias i16, i32* @bar.

Note that GlobalAlias now behaves a bit more like GlobalVariable. We
know that its type is always a pointer, so we omit the '*'.

For the bitcode, a nice surprise is that we were writing both identical types
already, so the format change is minimal. Auto upgrade is handled by looking
through the casts and no new fields are needed for now. New bitcode will
simply have different types for Alias and Aliasee.

One last interesting point in the patch is that replaceAllUsesWith becomes
smart enough to avoid putting a ConstantExpr in the aliasee. This seems better
than checking and updating every caller.

A followup patch will delete getAliasedGlobal now that it is redundant. Another
patch will add support for an explicit offset.

llvm-svn: 209007
2014-05-16 19:35:39 +00:00

50 lines
1.3 KiB
LLVM

; RUN: llvm-extract -func foo -S < %s | FileCheck %s
; RUN: llvm-extract -delete -func foo -S < %s | FileCheck --check-prefix=DELETE %s
; RUN: llvm-extract -alias zeda0 -S < %s | FileCheck --check-prefix=ALIAS %s
; RUN: llvm-extract -ralias '.*bar' -S < %s | FileCheck --check-prefix=ALIASRE %s
; Both aliases should be converted to declarations
; CHECK: @zeda0 = external global i32
; CHECK: define i32* @foo() {
; CHECK-NEXT: call void @a0bar()
; CHECK-NEXT: ret i32* @zeda0
; CHECK-NEXT: }
; CHECK: declare void @a0bar()
; DELETE: @zed = global i32 0
; DELETE: @zeda0 = alias i32* @zed
; DELETE-NEXT: @a0foo = alias i32* ()* @foo
; DELETE-NEXT: @a0a0bar = alias void ()* @bar
; DELETE-NEXT: @a0bar = alias void ()* @bar
; DELETE: declare i32* @foo()
; DELETE: define void @bar() {
; DELETE-NEXT: %c = call i32* @foo()
; DELETE-NEXT: ret void
; DELETE-NEXT: }
; ALIAS: @zed = external global i32
; ALIAS: @zeda0 = alias i32* @zed
; ALIASRE: @a0a0bar = alias void ()* @bar
; ALIASRE: @a0bar = alias void ()* @bar
; ALIASRE: declare void @bar()
@zed = global i32 0
@zeda0 = alias i32* @zed
@a0foo = alias i32* ()* @foo
define i32* @foo() {
call void @a0bar()
ret i32* @zeda0
}
@a0a0bar = alias void ()* @bar
@a0bar = alias void ()* @bar
define void @bar() {
%c = call i32* @foo()
ret void
}