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//===- BasicBlockUtils.cpp - Unit tests for BasicBlockUtils ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
SMDiagnostic Err;
std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
if (!Mod)
Err.print("BasicBlockUtilsTests", errs());
return Mod;
}
TEST(BasicBlockUtils, SplitBlockPredecessors) {
LLVMContext C;
std::unique_ptr<Module> M = parseIR(
C,
"define i32 @basic_func(i1 %cond) {\n"
"entry:\n"
" br i1 %cond, label %bb0, label %bb1\n"
"bb0:\n"
" br label %bb1\n"
"bb1:\n"
" %phi = phi i32 [ 0, %entry ], [ 1, %bb0 ]"
" ret i32 %phi\n"
"}\n"
"\n"
);
auto *F = M->getFunction("basic_func");
DominatorTree DT(*F);
// Make sure the dominator tree is properly updated if calling this on the
// entry block.
SplitBlockPredecessors(&F->getEntryBlock(), {}, "split.entry", &DT);
EXPECT_TRUE(DT.verify());
}
TEST(BasicBlockUtils, MergeBlockIntoPredecessor) {
LLVMContext C;
std::unique_ptr<Module> M = parseIR(C,
R"(
define i32 @f(i8* %str) {
entry:
%dead = extractvalue [1 x i8*] [ i8* blockaddress(@f, %L0) ], 0
br label %L0
L0:
ret i32 0
}
)");
// First remove the dead instruction to empty the usage of the constant
// containing blockaddress(@f, %L0)
Function *F = M->getFunction("f");
auto BBI = F->begin();
Instruction *DI = &*((*BBI).begin());
EXPECT_TRUE(DI->use_empty());
DI->eraseFromParent();
// Get L0 and make sure that it can be merged into entry block.
++BBI;
BasicBlock *BB = &(*BBI);
EXPECT_TRUE(MergeBlockIntoPredecessor(BB));
}
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