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87cd774844
This patch changes GlobalAlias to point to an arbitrary ConstantExpr and it is
up to MC (or the system assembler) to decide if that expression is valid or not.
This reduces our ability to diagnose invalid uses and how early we can spot
them, but it also lets us do things like
@test5 = alias inttoptr(i32 sub (i32 ptrtoint (i32* @test2 to i32),
i32 ptrtoint (i32* @bar to i32)) to i32*)
An important implication of this patch is that the notion of aliased global
doesn't exist any more. The alias has to encode the information needed to
access it in its metadata (linkage, visibility, type, etc).
Another consequence to notice is that getSection has to return a "const char *".
It could return a NullTerminatedStringRef if there was such a thing, but when
that was proposed the decision was to just uses "const char*" for that.
llvm-svn: 210062
17 lines
445 B
LLVM
17 lines
445 B
LLVM
; RUN: llvm-link %s %S/Inputs/alias.ll -S -o - | FileCheck %s
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; RUN: llvm-link %S/Inputs/alias.ll %s -S -o - | FileCheck %s
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@foo = weak global i32 0
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; CHECK-DAG: @foo = alias i32* @zed
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@bar = alias i32* @foo
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; CHECK-DAG: @bar = alias i32* @foo
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@foo2 = weak global i32 0
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; CHECK-DAG: @foo2 = alias bitcast (i32* @zed to i16*)
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@bar2 = alias i32* @foo2
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; CHECK-DAG: @bar2 = alias bitcast (i16* @foo2 to i32*)
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; CHECK-DAG: @zed = global i32 42
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