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[CUDA] Die if we ask the NVPTX backend to emit a global ctor/dtor.

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Summary: Previously we'd just silently skip these.

Reviewers: tra, jholewinski

Subscribers: llvm-commits, jhen, echristo,

Differential Revision: http://reviews.llvm.org/D16739

llvm-svn: 259279
This commit is contained in:
Justin Lebar 2016-01-30 01:07:38 +00:00
parent 433c43cd85
commit ead59f4765
4 changed files with 40 additions and 0 deletions
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17
llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
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@ -802,6 +802,13 @@ void NVPTXAsmPrinter::recordAndEmitFilenames(Module &M) {
}
}
static bool isEmptyXXStructor(GlobalVariable *GV) {
if (!GV) return true;
const ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
if (!InitList) return true; // Not an array; we don't know how to parse.
return InitList->getNumOperands() == 0;
}
bool NVPTXAsmPrinter::doInitialization(Module &M) {
// Construct a default subtarget off of the TargetMachine defaults. The
// rest of NVPTX isn't friendly to change subtargets per function and
@ -816,6 +823,16 @@ bool NVPTXAsmPrinter::doInitialization(Module &M) {
report_fatal_error("Module has aliases, which NVPTX does not support.");
return true; // error
}
if (!isEmptyXXStructor(M.getNamedGlobal("llvm.global_ctors"))) {
report_fatal_error(
"Module has a nontrivial global ctor, which NVPTX does not support.");
return true; // error
}
if (!isEmptyXXStructor(M.getNamedGlobal("llvm.global_dtors"))) {
report_fatal_error(
"Module has a nontrivial global dtor, which NVPTX does not support.");
return true; // error
}
SmallString<128> Str1;
raw_svector_ostream OS1(Str1);

5
llvm/test/CodeGen/NVPTX/global-ctor-empty.ll Normal file
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@ -0,0 +1,5 @@
; RUN: llc < %s -march=nvptx -mcpu=sm_20 2>&1
; Check that llc doesn't die when given an empty global ctor / dtor.
@llvm.global_ctors = appending global [0 x { i32, void ()*, i8* }] []
@llvm.global_dtors = appending global [0 x { i32, void ()*, i8* }] []

9
llvm/test/CodeGen/NVPTX/global-ctor.ll Normal file
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@ -0,0 +1,9 @@
; RUN: not llc < %s -march=nvptx -mcpu=sm_20 2>&1 | FileCheck %s
; Check that llc dies when given a nonempty global ctor.
@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @foo, i8* null }]
; CHECK: ERROR: Module has a nontrivial global ctor
define internal void @foo() {
ret void
}

9
llvm/test/CodeGen/NVPTX/global-dtor.ll Normal file
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@ -0,0 +1,9 @@
; RUN: not llc < %s -march=nvptx -mcpu=sm_20 2>&1 | FileCheck %s
; Check that llc dies when given a nonempty global dtor.
@llvm.global_dtors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @foo, i8* null }]
; CHECK: ERROR: Module has a nontrivial global dtor
define internal void @foo() {
ret void
}