620b544ddf
Add a third parameter to {AsHex} which specifies whether the prefix
"0x" should be printed. Also, add the {AsHexBytes} helper which
outputs the hex number as individual bytes separated by a whitespace.
Also add unit tests for both helpers.
Both helper will be used in an upcoming refactoring of wasm error
messages:
https://chromium-review.googlesource.com/c/565282
R=titzer@chromium.org
Change-Id: I42d5ace9841ffb918cb4d6803b6347229e446097
Reviewed-on: https://chromium-review.googlesource.com/583448
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46859}
134 lines
3.5 KiB
C++
134 lines
3.5 KiB
C++
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/ostreams.h"
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#include "src/objects.h"
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#include "src/objects/string.h"
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#if V8_OS_WIN
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#if _MSC_VER < 1900
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#define snprintf sprintf_s
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#endif
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#endif
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namespace v8 {
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namespace internal {
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OFStreamBase::OFStreamBase(FILE* f) : f_(f) {}
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OFStreamBase::~OFStreamBase() {}
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int OFStreamBase::sync() {
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std::fflush(f_);
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return 0;
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}
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OFStreamBase::int_type OFStreamBase::overflow(int_type c) {
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return (c != EOF) ? std::fputc(c, f_) : c;
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}
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std::streamsize OFStreamBase::xsputn(const char* s, std::streamsize n) {
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return static_cast<std::streamsize>(
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std::fwrite(s, 1, static_cast<size_t>(n), f_));
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}
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OFStream::OFStream(FILE* f) : std::ostream(nullptr), buf_(f) {
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DCHECK_NOT_NULL(f);
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rdbuf(&buf_);
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}
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OFStream::~OFStream() {}
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namespace {
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// Locale-independent predicates.
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bool IsPrint(uint16_t c) { return 0x20 <= c && c <= 0x7e; }
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bool IsSpace(uint16_t c) { return (0x9 <= c && c <= 0xd) || c == 0x20; }
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bool IsOK(uint16_t c) { return (IsPrint(c) || IsSpace(c)) && c != '\\'; }
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std::ostream& PrintUC16(std::ostream& os, uint16_t c, bool (*pred)(uint16_t)) {
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char buf[10];
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const char* format = pred(c) ? "%c" : (c <= 0xff) ? "\\x%02x" : "\\u%04x";
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snprintf(buf, sizeof(buf), format, c);
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return os << buf;
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}
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std::ostream& PrintUC16ForJSON(std::ostream& os, uint16_t c,
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bool (*pred)(uint16_t)) {
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// JSON does not allow \x99; must use \u0099.
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char buf[10];
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const char* format = pred(c) ? "%c" : "\\u%04x";
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snprintf(buf, sizeof(buf), format, c);
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return os << buf;
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}
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std::ostream& PrintUC32(std::ostream& os, int32_t c, bool (*pred)(uint16_t)) {
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if (c <= String::kMaxUtf16CodeUnit) {
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return PrintUC16(os, static_cast<uint16_t>(c), pred);
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}
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char buf[13];
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snprintf(buf, sizeof(buf), "\\u{%06x}", c);
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return os << buf;
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}
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} // namespace
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std::ostream& operator<<(std::ostream& os, const AsReversiblyEscapedUC16& c) {
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return PrintUC16(os, c.value, IsOK);
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}
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std::ostream& operator<<(std::ostream& os, const AsEscapedUC16ForJSON& c) {
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if (c.value == '\n') return os << "\\n";
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if (c.value == '\r') return os << "\\r";
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if (c.value == '\t') return os << "\\t";
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if (c.value == '\"') return os << "\\\"";
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return PrintUC16ForJSON(os, c.value, IsOK);
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}
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std::ostream& operator<<(std::ostream& os, const AsUC16& c) {
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return PrintUC16(os, c.value, IsPrint);
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}
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std::ostream& operator<<(std::ostream& os, const AsUC32& c) {
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return PrintUC32(os, c.value, IsPrint);
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}
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std::ostream& operator<<(std::ostream& os, const AsHex& hex) {
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// Each byte uses up to two characters. Plus two characters for the prefix,
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// plus null terminator.
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DCHECK_GE(sizeof(hex.value) * 2, hex.min_width);
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static constexpr size_t kMaxHexLength = 3 + sizeof(hex.value) * 2;
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char buf[kMaxHexLength];
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snprintf(buf, kMaxHexLength, "%s%.*" PRIx64, hex.with_prefix ? "0x" : "",
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hex.min_width, hex.value);
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return os << buf;
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}
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std::ostream& operator<<(std::ostream& os, const AsHexBytes& hex) {
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uint8_t bytes = hex.min_bytes;
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while (bytes < sizeof(hex.value) && (hex.value >> (bytes * 8) != 0)) ++bytes;
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for (uint8_t b = 0; b < bytes; ++b) {
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if (b) os << " ";
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uint8_t printed_byte =
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hex.byte_order == AsHexBytes::kLittleEndian ? b : bytes - b - 1;
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os << AsHex((hex.value >> (8 * printed_byte)) & 0xff, 2);
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}
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return os;
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}
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} // namespace internal
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} // namespace v8
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