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178c3cb32f
Summary: The general Function::hasAddressTaken has two issues that make it inappropriate for our purposes: 1. it is sensitive to dead constant users (PR43858 / crbug.com/1019970), leading to different codegen when debu info is enabled 2. it considers direct calls via a function cast to be address escapes The first is fixable, but the second is not, because IPO clients rely on this behavior. They assume this function means that all call sites are analyzable for IPO purposes. So, implement our own analysis, which gets closer to finding functions that may be indirect call targets. Reviewers: ajpaverd, efriedma, hans Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D69676
36 lines
843 B
LLVM
36 lines
843 B
LLVM
; RUN: llc < %s -mtriple=x86_64-pc-windows-msvc | FileCheck %s
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; Check how constant function pointer casts are handled.
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declare void @unprototyped(...)
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define i32 @call_unprototyped() {
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call void bitcast (void (...)* @unprototyped to void ()*)()
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ret i32 0
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}
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; CHECK-LABEL: call_unprototyped:
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; CHECK: callq unprototyped
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; CHECK: xorl %eax, %eax
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; CHECK: retq
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declare void @escaped_cast()
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define i32 @escape_it_with_cast(i8** %p) {
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store i8* bitcast (void ()* @escaped_cast to i8*), i8** %p
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ret i32 0
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}
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declare void @dead_constant()
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"cfguard", i32 1}
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!dead_constant_root = !{!1}
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!1 = !DITemplateValueParameter(name: "dead_constant", value: i8* bitcast (void ()* @dead_constant to i8*))
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; CHECK-LABEL: .section .gfids$y,"dr"
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; CHECK-NEXT: .symidx escaped_cast
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; CHECK-NOT: .symidx
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