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llvm/unittests/Analysis/CFGTest.cpp
Mehdi Amini 8be7707c14 Remove every uses of getGlobalContext() in LLVM (but the C API) 
At the same time, fixes InstructionsTest::CastInst unittest: yes
you can leave the IR in an invalid state and exit when you don't
destroy the context (like the global one), no longer now.

This is the first part of http://reviews.llvm.org/D19094

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266379 91177308-0d34-0410-b5e6-96231b3b80d8
2016-04-14 21:59:01 +00:00

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//===- CFGTest.cpp - CFG tests --------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
// This fixture assists in running the isPotentiallyReachable utility four ways
// and ensuring it produces the correct answer each time.
class IsPotentiallyReachableTest : public testing::Test {
protected:
void ParseAssembly(const char *Assembly) {
SMDiagnostic Error;
M = parseAssemblyString(Assembly, Error, Context);
std::string errMsg;
raw_string_ostream os(errMsg);
Error.print("", os);
// A failure here means that the test itself is buggy.
if (!M)
report_fatal_error(os.str().c_str());
Function *F = M->getFunction("test");
if (F == nullptr)
report_fatal_error("Test must have a function named @test");
A = B = nullptr;
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
if (I->hasName()) {
if (I->getName() == "A")
A = &*I;
else if (I->getName() == "B")
B = &*I;
}
}
if (A == nullptr)
report_fatal_error("@test must have an instruction %A");
if (B == nullptr)
report_fatal_error("@test must have an instruction %B");
}
void ExpectPath(bool ExpectedResult) {
static char ID;
class IsPotentiallyReachableTestPass : public FunctionPass {
public:
IsPotentiallyReachableTestPass(bool ExpectedResult,
Instruction *A, Instruction *B)
: FunctionPass(ID), ExpectedResult(ExpectedResult), A(A), B(B) {}
static int initialize() {
PassInfo *PI = new PassInfo("isPotentiallyReachable testing pass",
"", &ID, nullptr, true, true);
PassRegistry::getPassRegistry()->registerPass(*PI, false);
initializeLoopInfoWrapperPassPass(*PassRegistry::getPassRegistry());
initializeDominatorTreeWrapperPassPass(
*PassRegistry::getPassRegistry());
return 0;
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
AU.addRequired<LoopInfoWrapperPass>();
AU.addRequired<DominatorTreeWrapperPass>();
}
bool runOnFunction(Function &F) override {
if (!F.hasName() || F.getName() != "test")
return false;
LoopInfo *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
DominatorTree *DT =
&getAnalysis<DominatorTreeWrapperPass>().getDomTree();
EXPECT_EQ(isPotentiallyReachable(A, B, nullptr, nullptr),
ExpectedResult);
EXPECT_EQ(isPotentiallyReachable(A, B, DT, nullptr), ExpectedResult);
EXPECT_EQ(isPotentiallyReachable(A, B, nullptr, LI), ExpectedResult);
EXPECT_EQ(isPotentiallyReachable(A, B, DT, LI), ExpectedResult);
return false;
}
bool ExpectedResult;
Instruction *A, *B;
};
static int initialize = IsPotentiallyReachableTestPass::initialize();
(void)initialize;
IsPotentiallyReachableTestPass *P =
new IsPotentiallyReachableTestPass(ExpectedResult, A, B);
legacy::PassManager PM;
PM.add(P);
PM.run(*M);
}
LLVMContext Context;
std::unique_ptr<Module> M;
Instruction *A, *B;
};
}
TEST_F(IsPotentiallyReachableTest, SameBlockNoPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" bitcast i8 undef to i8\n"
" %B = bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"}\n");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, SameBlockPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" %A = bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" %B = bitcast i8 undef to i8\n"
" ret void\n"
"}\n");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, SameBlockNoLoop) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" br label %middle\n"
"middle:\n"
" %B = bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" %A = bitcast i8 undef to i8\n"
" br label %nextblock\n"
"nextblock:\n"
" ret void\n"
"}\n");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, StraightNoPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" %B = bitcast i8 undef to i8\n"
" br label %exit\n"
"exit:\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, StraightPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" %A = bitcast i8 undef to i8\n"
" br label %exit\n"
"exit:\n"
" %B = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, DestUnreachable) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" br label %midblock\n"
"midblock:\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"unreachable:\n"
" %B = bitcast i8 undef to i8\n"
" br label %midblock\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, BranchToReturn) {
ParseAssembly(
"define void @test(i1 %x) {\n"
"entry:\n"
" %A = bitcast i8 undef to i8\n"
" br i1 %x, label %block1, label %block2\n"
"block1:\n"
" ret void\n"
"block2:\n"
" %B = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, SimpleLoop1) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop\n"
"loop:\n"
" %B = bitcast i8 undef to i8\n"
" %A = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop, label %exit\n"
"exit:\n"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, SimpleLoop2) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" %B = bitcast i8 undef to i8\n"
" br label %loop\n"
"loop:\n"
" %A = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop, label %exit\n"
"exit:\n"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, SimpleLoop3) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop\n"
"loop:\n"
" %B = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop, label %exit\n"
"exit:\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOther1) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop1\n"
"loop1:\n"
" %A = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop1, label %loop1exit\n"
"loop1exit:\n"
" br label %loop2\n"
"loop2:\n"
" %B = bitcast i8 undef to i8\n"
" %y = call i1 @switch()\n"
" br i1 %x, label %loop2, label %loop2exit\n"
"loop2exit:"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOther2) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop1\n"
"loop1:\n"
" %B = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop1, label %loop1exit\n"
"loop1exit:\n"
" br label %loop2\n"
"loop2:\n"
" %A = bitcast i8 undef to i8\n"
" %y = call i1 @switch()\n"
" br i1 %x, label %loop2, label %loop2exit\n"
"loop2exit:"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOtherInsideAThirdLoop) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %outerloop3\n"
"outerloop3:\n"
" br label %innerloop1\n"
"innerloop1:\n"
" %B = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %innerloop1, label %innerloop1exit\n"
"innerloop1exit:\n"
" br label %innerloop2\n"
"innerloop2:\n"
" %A = bitcast i8 undef to i8\n"
" %y = call i1 @switch()\n"
" br i1 %x, label %innerloop2, label %innerloop2exit\n"
"innerloop2exit:"
" ;; In outer loop3 now.\n"
" %z = call i1 @switch()\n"
" br i1 %z, label %outerloop3, label %exit\n"
"exit:\n"
" ret void\n"
"}");
ExpectPath(true);
}
static const char *BranchInsideLoopIR =
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop\n"
"loop:\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %nextloopblock, label %exit\n"
"nextloopblock:\n"
" %y = call i1 @switch()\n"
" br i1 %y, label %left, label %right\n"
"left:\n"
" %A = bitcast i8 undef to i8\n"
" br label %loop\n"
"right:\n"
" %B = bitcast i8 undef to i8\n"
" br label %loop\n"
"exit:\n"
" ret void\n"
"}";
TEST_F(IsPotentiallyReachableTest, BranchInsideLoop) {
ParseAssembly(BranchInsideLoopIR);
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, ModifyTest) {
ParseAssembly(BranchInsideLoopIR);
succ_iterator S = succ_begin(&*++M->getFunction("test")->begin());
BasicBlock *OldBB = S[0];
S[0] = S[1];
ExpectPath(false);
S[0] = OldBB;
ExpectPath(true);
}
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