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763457e70b
- Provides static constructors for doing number to string conversions without using temporaries. - There are several ways to do this, I think given the Twine constraints this is the simplest one. - One FIXME for fast number -> hex conversion. - Added another comment on one last major bit of perf work Twines need, which is to make raw_svector_ostream more efficient. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77445 91177308-0d34-0410-b5e6-96231b3b80d8
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
//===- TwineTest.cpp - Twine unit tests -----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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std::string repr(const Twine &Value) {
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std::string res;
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llvm::raw_string_ostream OS(res);
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Value.printRepr(OS);
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return OS.str();
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}
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TEST(TwineTest, Construction) {
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EXPECT_EQ("", Twine().str());
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EXPECT_EQ("hi", Twine("hi").str());
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EXPECT_EQ("hi", Twine(std::string("hi")).str());
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EXPECT_EQ("hi", Twine(StringRef("hi")).str());
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EXPECT_EQ("hi", Twine(StringRef(std::string("hi"))).str());
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EXPECT_EQ("hi", Twine(StringRef("hithere", 2)).str());
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}
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TEST(TwineTest, Numbers) {
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EXPECT_EQ("123", Twine::utostr(123).str());
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EXPECT_EQ("-123", Twine::itostr(-123).str());
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EXPECT_EQ("123", Twine::utostr(123).str());
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EXPECT_EQ("-123", Twine::itostr(-123).str());
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EXPECT_EQ("123", Twine::utostr((char) 123).str());
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EXPECT_EQ("-123", Twine::itostr((char) -123).str());
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EXPECT_EQ("7B", Twine::utohexstr(123).str());
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EXPECT_EQ("FFFFFFFFFFFFFF85", Twine::itohexstr(-123).str());
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}
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TEST(TwineTest, Concat) {
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// Check verse repr, since we care about the actual representation not just
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// the result.
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// Concat with null.
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EXPECT_EQ("(Twine null empty)",
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repr(Twine("hi").concat(Twine::createNull())));
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EXPECT_EQ("(Twine null empty)",
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repr(Twine::createNull().concat(Twine("hi"))));
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// Concat with empty.
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EXPECT_EQ("(Twine cstring:\"hi\" empty)",
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repr(Twine("hi").concat(Twine())));
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EXPECT_EQ("(Twine cstring:\"hi\" empty)",
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repr(Twine().concat(Twine("hi"))));
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// Concatenation of unary ropes.
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EXPECT_EQ("(Twine cstring:\"a\" cstring:\"b\")",
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repr(Twine("a").concat(Twine("b"))));
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// Concatenation of other ropes.
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EXPECT_EQ("(Twine rope:(Twine cstring:\"a\" cstring:\"b\") cstring:\"c\")",
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repr(Twine("a").concat(Twine("b")).concat(Twine("c"))));
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EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine cstring:\"b\" cstring:\"c\"))",
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repr(Twine("a").concat(Twine("b").concat(Twine("c")))));
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}
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// I suppose linking in the entire code generator to add a unit test to check
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// the code size of the concat operation is overkill... :)
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} // end anonymous namespace
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