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Teach DataLayout that zero-byte pointer sizes don't make sense.

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Previously this would result in assertion failures or simply crashes
at various points in the optimizer when trying to create types of zero
bit width.

llvm-svn: 230936
This commit is contained in:
Owen Anderson 2015-03-02 06:00:02 +00:00
parent 39b32da21b
commit 22efff3c98
2 changed files with 8 additions and 0 deletions
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2
lib/IR/DataLayout.cpp
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@ -259,6 +259,8 @@ void DataLayout::parseSpecifier(StringRef Desc) {
"Missing size specification for pointer in datalayout string"); "Missing size specification for pointer in datalayout string");
Split = split(Rest, ':'); Split = split(Rest, ':');
unsigned PointerMemSize = inBytes(getInt(Tok)); unsigned PointerMemSize = inBytes(getInt(Tok));
if (!PointerMemSize)
report_fatal_error("Invalid pointer size of 0 bytes");
// ABI alignment. // ABI alignment.
if (Rest.empty()) if (Rest.empty())

6
test/Assembler/invalid-datalayout19.ll Normal file
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@ -0,0 +1,6 @@
; RUN: not llvm-as < %s 2>&1 | FileCheck %s
target datalayout = "p:0:32:32"
; CHECK: Invalid pointer size of 0 bytes