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Teach DataLayout that pointer ABI and preferred alignments are required to be powers of two.

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Previously this resulted in asserts and/or crashes (depending on build configuration) at various phases in the optimizer.

llvm-svn: 230938
This commit is contained in:
Owen Anderson 2015-03-02 06:33:51 +00:00
parent d333c36e8a
commit 040f2f890e
3 changed files with 18 additions and 0 deletions
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6
llvm/lib/IR/DataLayout.cpp
View File

@ -268,12 +268,18 @@ void DataLayout::parseSpecifier(StringRef Desc) {
"Missing alignment specification for pointer in datalayout string");
Split = split(Rest, ':');
unsigned PointerABIAlign = inBytes(getInt(Tok));
if (!isPowerOf2_64(PointerABIAlign))
report_fatal_error(
"Pointer ABI alignment must be a power of 2");
// Preferred alignment.
unsigned PointerPrefAlign = PointerABIAlign;
if (!Rest.empty()) {
Split = split(Rest, ':');
PointerPrefAlign = inBytes(getInt(Tok));
if (!isPowerOf2_64(PointerPrefAlign))
report_fatal_error(
"Pointer preferred alignment must be a power of 2");
}
setPointerAlignment(AddrSpace, PointerABIAlign, PointerPrefAlign,

6
llvm/test/Assembler/invalid-datalayout20.ll Normal file
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@ -0,0 +1,6 @@
; RUN: not llvm-as < %s 2>&1 | FileCheck %s
target datalayout = "p:64:24:64"
; CHECK: Pointer ABI alignment must be a power of 2

6
llvm/test/Assembler/invalid-datalayout21.ll Normal file
View File

@ -0,0 +1,6 @@
; RUN: not llvm-as < %s 2>&1 | FileCheck %s
target datalayout = "p:64:64:24"
; CHECK: Pointer preferred alignment must be a power of 2