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llvm-project/llvm/unittests/ExecutionEngine/JITLink/EHFrameSupportTests.cpp
Lang Hames 1cf81274f4 [JITLink] Add eh-frame CFI inspector, fix crash on malformed FDEs. 
Add a fix to check that FDE pc-begin targets are defined before calling
getBlock (which will crash if the target is not defined). FDE pc-begins
pointing at undefined symbols are expected to arise only in obscure
circumstances (malformed objects, or removal of targets by JITLink
passes), but we want to handle them gracefully. With this patch the
FDE will be retained, but without any keepalive edge to it. Unless
some pass takes action to mark it as live it will be dead-stripped.

To make it easier for passes to connect FDEs to their targets a new
EHFrameCFIBlockInspector utility is added. This allows clients to
quickly determine whether a CFI record is a CIE or an FDE (assuming
that it's valid), and retrieve any personality, pc-begin, cie, or
LSDA edges associated with it.
2022-08-14 10:49:26 -07:00

247 lines
13 KiB
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//===----- EHFrameSupportTests.cpp - Unit tests for eh-frame support ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h"
#include "llvm/ExecutionEngine/JITLink/JITLink.h"
#include "llvm/ExecutionEngine/JITLink/MachO_arm64.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace llvm::jitlink;
// TestObjectBytes contains a MachO arm64 object file with three symbols: foo,
// bar, and main, with corresponding FDEs. It was generated with:
//
// % cat foo.cpp
// extern "C" void e();
// extern "C" void a() {
// try {
// e();
// } catch (int x) {
// }
// }
// extern "C" void b() noexcept {}
// extern "C" void c() noexcept {}
//
// % clang++ --target=arm64-apple-darwin -femit-dwarf-unwind=always -c -o foo.o
// \
// foo.c
// % xxd -i foo.o
static const uint8_t TestObjectBytes[] = {
0xcf, 0xfa, 0xed, 0xfe, 0x0c, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x08, 0x02, 0x00, 0x00,
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0x01, 0x00, 0x00, 0x06, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x06,
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llvm::MemoryBufferRef
TestObject(StringRef(reinterpret_cast<const char *>(TestObjectBytes),
sizeof(TestObjectBytes)),
"foo.o");
TEST(EHFrameCFIBlockInspector, BasicSuccessCase) {
// Create a LinkGraph from the test object above and verify that
// (1) There are two CIEs -- one with a personality function and one
// without.
// (2) There are three FDEs -- two attached to the CIE with no
// personality, one attached to the CIE with a personality.
// (3) Each FDE has an edge pointing to the CIE at the correct offset.
// (4) Each function has exactly one FDE pointing at it.
auto G = cantFail(createLinkGraphFromMachOObject_arm64(TestObject));
cantFail(createEHFrameSplitterPass_MachO_arm64()(*G));
cantFail(createEHFrameEdgeFixerPass_MachO_arm64()(*G));
auto *EHFrame = G->findSectionByName("__TEXT,__eh_frame");
assert(EHFrame && "eh-frame missing?");
SmallVector<Block *, 2> CIEs;
for (auto *B : EHFrame->blocks()) {
auto CFIBI = EHFrameCFIBlockInspector::FromEdgeScan(*B);
if (CFIBI.isCIE()) {
CIEs.push_back(B);
// If this CIE has an edge, check that getPersonalityEdge returns it.
if (B->edges_size() != 0)
EXPECT_TRUE(!!CFIBI.getPersonalityEdge());
}
}
ASSERT_EQ(CIEs.size(), 2U);
// Make sure that the CIE with no edges is CIEs[0].
if (CIEs[1]->edges_empty())
std::swap(CIEs[0], CIEs[1]);
EXPECT_TRUE(CIEs[0]->edges_empty());
EXPECT_EQ(CIEs[1]->edges_size(), 1U);
std::set<StringRef> Targets;
for (auto *B : EHFrame->blocks()) {
auto CFIBI = EHFrameCFIBlockInspector::FromEdgeScan(*B);
if (CFIBI.isFDE()) {
ASSERT_TRUE(!!CFIBI.getCIEEdge());
ASSERT_TRUE(CFIBI.getCIEEdge()->getTarget().isDefined());
auto &CIE = CFIBI.getCIEEdge()->getTarget().getBlock();
ASSERT_TRUE(&CIE == CIEs[0] || &CIE == CIEs[1]);
ASSERT_TRUE(!!CFIBI.getPCBeginEdge());
auto &PCBeginTarget = CFIBI.getPCBeginEdge()->getTarget();
ASSERT_TRUE(PCBeginTarget.hasName());
Targets.insert(PCBeginTarget.getName());
// If the FDE points at CIEs[0] (the CIE without a personality) then it
// should not have an LSDA. If it points to CIEs[1] then it should have
// an LSDA.
if (&CIE == CIEs[0])
EXPECT_EQ(CFIBI.getLSDAEdge(), nullptr);
else
EXPECT_NE(CFIBI.getLSDAEdge(), nullptr);
}
}
EXPECT_EQ(Targets.size(), 3U) << "Unexpected number of FDEs";
EXPECT_EQ(Targets.count("_a"), 1U);
EXPECT_EQ(Targets.count("_b"), 1U);
EXPECT_EQ(Targets.count("_c"), 1U);
}
TEST(EHFrameCFIBlockInspector, ExternalPCBegin) {
// Check that we don't crash if we transform the target of an FDE into an
// external symbol before running edge-fixing.
auto G = cantFail(createLinkGraphFromMachOObject_arm64(TestObject));
// Make '_a' external.
for (auto *Sym : G->defined_symbols())
if (Sym->hasName() && Sym->getName() == "_a") {
G->makeExternal(*Sym);
break;
}
// Run the splitter and edge-fixer passes.
cantFail(createEHFrameSplitterPass_MachO_arm64()(*G));
cantFail(createEHFrameEdgeFixerPass_MachO_arm64()(*G));
}
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