[ADT] Replace std::isprint by llvm::isPrint.

The standard library functions ::isprint/std::isprint have platform-
and locale-dependent behavior which makes LLVM's output less
predictable. In particular, regression tests my fail depending on the
implementation of these functions.

Implement llvm::isPrint in StringExtras.h with a standard behavior and
replace all uses of ::isprint/std::isprint by a call it llvm::isPrint.
The function is inlined and does not look up language settings so it
should perform better than the standard library's version.

Such a replacement has already been done for isdigit, isalpha, isxdigit
in r314883. gtest does the same in gtest-printers.cc using the following
justification:

    // Returns true if c is a printable ASCII character.  We test the
    // value of c directly instead of calling isprint(), which is buggy on
    // Windows Mobile.
    inline bool IsPrintableAscii(wchar_t c) {
      return 0x20 <= c && c <= 0x7E;
    }

Similar issues have also been encountered by Julia:
https://github.com/JuliaLang/julia/issues/7416

I noticed the problem myself when on Windows isprint('\t') started to
evaluate to true (see https://stackoverflow.com/questions/51435249) and
thus caused several unit tests to fail. The result of isprint doesn't
seem to be well-defined even for ASCII characters. Therefore I suggest
to replace isprint by a platform-independent version.

Differential Revision: https://reviews.llvm.org/D49680

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338034 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 6 insertions, 6 deletions

diff --git a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
index 4551718344c..1939dc6440f 100644
--- a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
+++ b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -699,7 +699,7 @@ static bool ParseBlock(BitstreamCursor &Stream, BitstreamBlockInfo &BlockInfo,
           std::string Str;
           bool ArrayIsPrintable = true;
           for (unsigned j = i - 1, je = Record.size(); j != je; ++j) {
-            if (!isprint(static_cast<unsigned char>(Record[j]))) {
+            if (!isPrint(static_cast<unsigned char>(Record[j]))) {
               ArrayIsPrintable = false;
               break;
             }
@@ -719,7 +719,7 @@ static bool ParseBlock(BitstreamCursor &Stream, BitstreamBlockInfo &BlockInfo,
         } else {
           bool BlobIsPrintable = true;
           for (unsigned i = 0, e = Blob.size(); i != e; ++i)
-            if (!isprint(static_cast<unsigned char>(Blob[i]))) {
+            if (!isPrint(static_cast<unsigned char>(Blob[i]))) {
               BlobIsPrintable = false;
               break;
             }
diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
index 610cd11365c..8041e6f5994 100644
--- a/tools/llvm-objdump/llvm-objdump.cpp
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -1651,7 +1651,7 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
             }
             Byte = Bytes.slice(Index)[0];
             outs() << format(" %02x", Byte);
-            AsciiData[NumBytes] = isprint(Byte) ? Byte : '.';
+            AsciiData[NumBytes] = isPrint(Byte) ? Byte : '.';
 
             uint8_t IndentOffset = 0;
             NumBytes++;
@@ -1899,7 +1899,7 @@ void llvm::PrintSectionContents(const ObjectFile *Obj) {
       // Print ascii.
       outs() << "  ";
       for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
-        if (std::isprint(static_cast<unsigned char>(Contents[addr + i]) & 0xFF))
+        if (isPrint(static_cast<unsigned char>(Contents[addr + i]) & 0xFF))
           outs() << Contents[addr + i];
         else
           outs() << ".";
diff --git a/tools/llvm-readobj/ObjDumper.cpp b/tools/llvm-readobj/ObjDumper.cpp
index 17675fd8f27..a725140c9d3 100644
--- a/tools/llvm-readobj/ObjDumper.cpp
+++ b/tools/llvm-readobj/ObjDumper.cpp
@@ -29,7 +29,7 @@ ObjDumper::~ObjDumper() {
 
 static void printAsPrintable(raw_ostream &W, const uint8_t *Start, size_t Len) {
   for (size_t i = 0; i < Len; i++)
-    W << (isprint(Start[i]) ? static_cast<char>(Start[i]) : '.');
+    W << (isPrint(Start[i]) ? static_cast<char>(Start[i]) : '.');
 }
 
 static Expected<object::SectionRef>
@@ -138,7 +138,7 @@ void ObjDumper::printSectionAsHex(const object::ObjectFile *Obj,
 
     TmpSecPtr = SecPtr;
     for (i = 0; TmpSecPtr + i < SecEnd && i < 16; ++i)
-      W.startLine() << (isprint(TmpSecPtr[i]) ? static_cast<char>(TmpSecPtr[i])
+      W.startLine() << (isPrint(TmpSecPtr[i]) ? static_cast<char>(TmpSecPtr[i])
                                               : '.');
 
     W.startLine() << '\n';