forked from OSchip/llvm-project
561 lines
20 KiB
C++
561 lines
20 KiB
C++
//===-- StringPrinter.cpp -------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/DataFormatters/StringPrinter.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/Target/Language.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/Status.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/ConvertUTF.h"
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#include <cctype>
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#include <locale>
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#include <memory>
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::formatters;
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using GetPrintableElementType = StringPrinter::GetPrintableElementType;
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using StringElementType = StringPrinter::StringElementType;
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/// DecodedCharBuffer stores the decoded contents of a single character. It
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/// avoids managing memory on the heap by copying decoded bytes into an in-line
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/// buffer.
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class DecodedCharBuffer {
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public:
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DecodedCharBuffer(std::nullptr_t) {}
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DecodedCharBuffer(const uint8_t *bytes, size_t size) : m_size(size) {
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if (size > MaxLength)
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llvm_unreachable("unsupported length");
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memcpy(m_data, bytes, size);
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}
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DecodedCharBuffer(const char *bytes, size_t size)
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: DecodedCharBuffer(reinterpret_cast<const uint8_t *>(bytes), size) {}
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const uint8_t *GetBytes() const { return m_data; }
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size_t GetSize() const { return m_size; }
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private:
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static constexpr unsigned MaxLength = 16;
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size_t m_size = 0;
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uint8_t m_data[MaxLength] = {0};
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};
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using EscapingHelper =
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std::function<DecodedCharBuffer(uint8_t *, uint8_t *, uint8_t *&)>;
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// we define this for all values of type but only implement it for those we
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// care about that's good because we get linker errors for any unsupported type
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template <StringElementType type>
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static DecodedCharBuffer
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GetPrintableImpl(uint8_t *buffer, uint8_t *buffer_end, uint8_t *&next,
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StringPrinter::EscapeStyle escape_style);
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// Mimic isprint() for Unicode codepoints.
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static bool isprint32(char32_t codepoint) {
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if (codepoint <= 0x1F || codepoint == 0x7F) // C0
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{
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return false;
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}
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if (codepoint >= 0x80 && codepoint <= 0x9F) // C1
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{
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return false;
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}
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if (codepoint == 0x2028 || codepoint == 0x2029) // line/paragraph separators
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{
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return false;
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}
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if (codepoint == 0x200E || codepoint == 0x200F ||
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(codepoint >= 0x202A &&
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codepoint <= 0x202E)) // bidirectional text control
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{
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return false;
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}
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if (codepoint >= 0xFFF9 &&
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codepoint <= 0xFFFF) // interlinears and generally specials
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{
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return false;
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}
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return true;
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}
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DecodedCharBuffer attemptASCIIEscape(llvm::UTF32 c,
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StringPrinter::EscapeStyle escape_style) {
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const bool is_swift_escape_style =
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escape_style == StringPrinter::EscapeStyle::Swift;
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switch (c) {
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case 0:
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return {"\\0", 2};
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case '\a':
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return {"\\a", 2};
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case '\b':
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if (is_swift_escape_style)
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return nullptr;
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return {"\\b", 2};
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case '\f':
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if (is_swift_escape_style)
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return nullptr;
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return {"\\f", 2};
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case '\n':
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return {"\\n", 2};
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case '\r':
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return {"\\r", 2};
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case '\t':
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return {"\\t", 2};
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case '\v':
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if (is_swift_escape_style)
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return nullptr;
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return {"\\v", 2};
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case '\"':
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return {"\\\"", 2};
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case '\'':
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if (is_swift_escape_style)
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return {"\\'", 2};
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return nullptr;
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case '\\':
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return {"\\\\", 2};
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}
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return nullptr;
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}
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template <>
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DecodedCharBuffer GetPrintableImpl<StringElementType::ASCII>(
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uint8_t *buffer, uint8_t *buffer_end, uint8_t *&next,
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StringPrinter::EscapeStyle escape_style) {
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// The ASCII helper always advances 1 byte at a time.
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next = buffer + 1;
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DecodedCharBuffer retval = attemptASCIIEscape(*buffer, escape_style);
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if (retval.GetSize())
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return retval;
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// Use llvm's locale-independent isPrint(char), instead of the libc
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// implementation which may give different results on different platforms.
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if (llvm::isPrint(*buffer))
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return {buffer, 1};
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unsigned escaped_len;
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constexpr unsigned max_buffer_size = 7;
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uint8_t data[max_buffer_size];
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switch (escape_style) {
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case StringPrinter::EscapeStyle::CXX:
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// Prints 4 characters, then a \0 terminator.
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escaped_len = sprintf((char *)data, "\\x%02x", *buffer);
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break;
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case StringPrinter::EscapeStyle::Swift:
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// Prints up to 6 characters, then a \0 terminator.
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escaped_len = sprintf((char *)data, "\\u{%x}", *buffer);
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break;
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}
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lldbassert(escaped_len > 0 && "unknown string escape style");
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return {data, escaped_len};
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}
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template <>
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DecodedCharBuffer GetPrintableImpl<StringElementType::UTF8>(
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uint8_t *buffer, uint8_t *buffer_end, uint8_t *&next,
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StringPrinter::EscapeStyle escape_style) {
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// If the utf8 encoded length is invalid (i.e., not in the closed interval
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// [1;4]), or if there aren't enough bytes to print, or if the subsequence
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// isn't valid utf8, fall back to printing an ASCII-escaped subsequence.
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if (!llvm::isLegalUTF8Sequence(buffer, buffer_end))
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return GetPrintableImpl<StringElementType::ASCII>(buffer, buffer_end, next,
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escape_style);
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// Convert the valid utf8 sequence to a utf32 codepoint. This cannot fail.
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llvm::UTF32 codepoint = 0;
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const llvm::UTF8 *buffer_for_conversion = buffer;
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llvm::ConversionResult result = llvm::convertUTF8Sequence(
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&buffer_for_conversion, buffer_end, &codepoint, llvm::strictConversion);
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assert(result == llvm::conversionOK &&
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"Failed to convert legal utf8 sequence");
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(void)result;
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// The UTF8 helper always advances by the utf8 encoded length.
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const unsigned utf8_encoded_len = buffer_for_conversion - buffer;
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next = buffer + utf8_encoded_len;
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DecodedCharBuffer retval = attemptASCIIEscape(codepoint, escape_style);
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if (retval.GetSize())
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return retval;
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if (isprint32(codepoint))
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return {buffer, utf8_encoded_len};
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unsigned escaped_len;
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constexpr unsigned max_buffer_size = 13;
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uint8_t data[max_buffer_size];
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switch (escape_style) {
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case StringPrinter::EscapeStyle::CXX:
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// Prints 10 characters, then a \0 terminator.
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escaped_len = sprintf((char *)data, "\\U%08x", codepoint);
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break;
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case StringPrinter::EscapeStyle::Swift:
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// Prints up to 12 characters, then a \0 terminator.
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escaped_len = sprintf((char *)data, "\\u{%x}", codepoint);
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break;
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}
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lldbassert(escaped_len > 0 && "unknown string escape style");
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return {data, escaped_len};
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}
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// Given a sequence of bytes, this function returns: a sequence of bytes to
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// actually print out + a length the following unscanned position of the buffer
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// is in next
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static DecodedCharBuffer GetPrintable(StringElementType type, uint8_t *buffer,
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uint8_t *buffer_end, uint8_t *&next,
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StringPrinter::EscapeStyle escape_style) {
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if (!buffer || buffer >= buffer_end)
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return {nullptr};
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switch (type) {
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case StringElementType::ASCII:
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return GetPrintableImpl<StringElementType::ASCII>(buffer, buffer_end, next,
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escape_style);
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case StringElementType::UTF8:
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return GetPrintableImpl<StringElementType::UTF8>(buffer, buffer_end, next,
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escape_style);
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default:
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return {nullptr};
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}
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}
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static EscapingHelper
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GetDefaultEscapingHelper(GetPrintableElementType elem_type,
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StringPrinter::EscapeStyle escape_style) {
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switch (elem_type) {
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case GetPrintableElementType::UTF8:
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case GetPrintableElementType::ASCII:
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return [escape_style, elem_type](uint8_t *buffer, uint8_t *buffer_end,
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uint8_t *&next) -> DecodedCharBuffer {
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return GetPrintable(elem_type == GetPrintableElementType::UTF8
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? StringElementType::UTF8
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: StringElementType::ASCII,
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buffer, buffer_end, next, escape_style);
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};
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}
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llvm_unreachable("bad element type");
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}
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/// Read a string encoded in accordance with \tparam SourceDataType from a
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/// host-side LLDB buffer, then pretty-print it to a stream using \p style.
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template <typename SourceDataType>
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static bool DumpEncodedBufferToStream(
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GetPrintableElementType style,
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llvm::ConversionResult (*ConvertFunction)(const SourceDataType **,
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const SourceDataType *,
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llvm::UTF8 **, llvm::UTF8 *,
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llvm::ConversionFlags),
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const StringPrinter::ReadBufferAndDumpToStreamOptions &dump_options) {
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assert(dump_options.GetStream() && "need a Stream to print the string to");
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Stream &stream(*dump_options.GetStream());
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if (dump_options.GetPrefixToken() != nullptr)
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stream.Printf("%s", dump_options.GetPrefixToken());
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if (dump_options.GetQuote() != 0)
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stream.Printf("%c", dump_options.GetQuote());
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auto data(dump_options.GetData());
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auto source_size(dump_options.GetSourceSize());
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if (data.GetByteSize() && data.GetDataStart() && data.GetDataEnd()) {
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const int bufferSPSize = data.GetByteSize();
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if (dump_options.GetSourceSize() == 0) {
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const int origin_encoding = 8 * sizeof(SourceDataType);
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source_size = bufferSPSize / (origin_encoding / 4);
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}
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const SourceDataType *data_ptr =
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(const SourceDataType *)data.GetDataStart();
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const SourceDataType *data_end_ptr = data_ptr + source_size;
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const bool zero_is_terminator = dump_options.GetBinaryZeroIsTerminator();
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if (zero_is_terminator) {
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while (data_ptr < data_end_ptr) {
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if (!*data_ptr) {
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data_end_ptr = data_ptr;
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break;
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}
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data_ptr++;
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}
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data_ptr = (const SourceDataType *)data.GetDataStart();
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}
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lldb::DataBufferSP utf8_data_buffer_sp;
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llvm::UTF8 *utf8_data_ptr = nullptr;
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llvm::UTF8 *utf8_data_end_ptr = nullptr;
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if (ConvertFunction) {
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utf8_data_buffer_sp =
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std::make_shared<DataBufferHeap>(4 * bufferSPSize, 0);
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utf8_data_ptr = (llvm::UTF8 *)utf8_data_buffer_sp->GetBytes();
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utf8_data_end_ptr = utf8_data_ptr + utf8_data_buffer_sp->GetByteSize();
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ConvertFunction(&data_ptr, data_end_ptr, &utf8_data_ptr,
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utf8_data_end_ptr, llvm::lenientConversion);
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if (!zero_is_terminator)
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utf8_data_end_ptr = utf8_data_ptr;
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// needed because the ConvertFunction will change the value of the
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// data_ptr.
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utf8_data_ptr =
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(llvm::UTF8 *)utf8_data_buffer_sp->GetBytes();
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} else {
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// just copy the pointers - the cast is necessary to make the compiler
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// happy but this should only happen if we are reading UTF8 data
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utf8_data_ptr = const_cast<llvm::UTF8 *>(
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reinterpret_cast<const llvm::UTF8 *>(data_ptr));
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utf8_data_end_ptr = const_cast<llvm::UTF8 *>(
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reinterpret_cast<const llvm::UTF8 *>(data_end_ptr));
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}
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const bool escape_non_printables = dump_options.GetEscapeNonPrintables();
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EscapingHelper escaping_callback;
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if (escape_non_printables)
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escaping_callback =
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GetDefaultEscapingHelper(style, dump_options.GetEscapeStyle());
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// since we tend to accept partial data (and even partially malformed data)
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// we might end up with no NULL terminator before the end_ptr hence we need
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// to take a slower route and ensure we stay within boundaries
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for (; utf8_data_ptr < utf8_data_end_ptr;) {
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if (zero_is_terminator && !*utf8_data_ptr)
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break;
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if (escape_non_printables) {
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uint8_t *next_data = nullptr;
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auto printable =
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escaping_callback(utf8_data_ptr, utf8_data_end_ptr, next_data);
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auto printable_bytes = printable.GetBytes();
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auto printable_size = printable.GetSize();
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// We failed to figure out how to print this string.
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if (!printable_bytes || !next_data)
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return false;
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for (unsigned c = 0; c < printable_size; c++)
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stream.Printf("%c", *(printable_bytes + c));
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utf8_data_ptr = (uint8_t *)next_data;
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} else {
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stream.Printf("%c", *utf8_data_ptr);
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utf8_data_ptr++;
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}
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}
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}
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if (dump_options.GetQuote() != 0)
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stream.Printf("%c", dump_options.GetQuote());
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if (dump_options.GetSuffixToken() != nullptr)
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stream.Printf("%s", dump_options.GetSuffixToken());
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if (dump_options.GetIsTruncated())
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stream.Printf("...");
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return true;
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}
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lldb_private::formatters::StringPrinter::ReadStringAndDumpToStreamOptions::
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ReadStringAndDumpToStreamOptions(ValueObject &valobj)
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: ReadStringAndDumpToStreamOptions() {
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SetEscapeNonPrintables(
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valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
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}
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lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::
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ReadBufferAndDumpToStreamOptions(ValueObject &valobj)
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: ReadBufferAndDumpToStreamOptions() {
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SetEscapeNonPrintables(
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valobj.GetTargetSP()->GetDebugger().GetEscapeNonPrintables());
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}
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lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStreamOptions::
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ReadBufferAndDumpToStreamOptions(
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const ReadStringAndDumpToStreamOptions &options)
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: ReadBufferAndDumpToStreamOptions() {
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SetStream(options.GetStream());
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SetPrefixToken(options.GetPrefixToken());
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SetSuffixToken(options.GetSuffixToken());
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SetQuote(options.GetQuote());
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SetEscapeNonPrintables(options.GetEscapeNonPrintables());
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SetBinaryZeroIsTerminator(options.GetBinaryZeroIsTerminator());
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SetEscapeStyle(options.GetEscapeStyle());
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}
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namespace lldb_private {
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namespace formatters {
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template <typename SourceDataType>
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static bool ReadEncodedBufferAndDumpToStream(
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StringElementType elem_type,
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const StringPrinter::ReadStringAndDumpToStreamOptions &options,
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llvm::ConversionResult (*ConvertFunction)(const SourceDataType **,
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const SourceDataType *,
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llvm::UTF8 **, llvm::UTF8 *,
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llvm::ConversionFlags)) {
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assert(options.GetStream() && "need a Stream to print the string to");
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if (!options.GetStream())
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return false;
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if (options.GetLocation() == 0 ||
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options.GetLocation() == LLDB_INVALID_ADDRESS)
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return false;
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lldb::TargetSP target_sp = options.GetTargetSP();
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if (!target_sp)
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return false;
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constexpr int type_width = sizeof(SourceDataType);
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constexpr int origin_encoding = 8 * type_width;
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if (origin_encoding != 8 && origin_encoding != 16 && origin_encoding != 32)
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return false;
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// If not UTF8 or ASCII, conversion to UTF8 is necessary.
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if (origin_encoding != 8 && !ConvertFunction)
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return false;
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bool needs_zero_terminator = options.GetNeedsZeroTermination();
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bool is_truncated = false;
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const auto max_size = target_sp->GetMaximumSizeOfStringSummary();
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uint32_t sourceSize;
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if (elem_type == StringElementType::ASCII && !options.GetSourceSize()) {
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// FIXME: The NSString formatter sets HasSourceSize(true) when the size is
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// actually unknown, as well as SetBinaryZeroIsTerminator(false). IIUC the
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// C++ formatter also sets SetBinaryZeroIsTerminator(false) when it doesn't
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// mean to. I don't see how this makes sense: we should fix the formatters.
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//
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// Until then, the behavior that's expected for ASCII strings with unknown
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// lengths is to read up to the max size and then null-terminate. Do that.
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sourceSize = max_size;
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needs_zero_terminator = true;
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} else if (options.HasSourceSize()) {
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sourceSize = options.GetSourceSize();
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if (!options.GetIgnoreMaxLength()) {
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if (sourceSize > max_size) {
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sourceSize = max_size;
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is_truncated = true;
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}
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}
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} else {
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sourceSize = max_size;
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needs_zero_terminator = true;
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}
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const int bufferSPSize = sourceSize * type_width;
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lldb::DataBufferSP buffer_sp(new DataBufferHeap(bufferSPSize, 0));
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// Check if we got bytes. We never get any bytes if we have an empty
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// string, but we still continue so that we end up actually printing
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// an empty string ("").
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if (sourceSize != 0 && !buffer_sp->GetBytes())
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return false;
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Status error;
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char *buffer = reinterpret_cast<char *>(buffer_sp->GetBytes());
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if (elem_type == StringElementType::ASCII)
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target_sp->ReadCStringFromMemory(options.GetLocation(), buffer,
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bufferSPSize, error);
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else if (needs_zero_terminator)
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target_sp->ReadStringFromMemory(options.GetLocation(), buffer,
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bufferSPSize, error, type_width);
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else
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target_sp->ReadMemory(options.GetLocation(), buffer, bufferSPSize, error);
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if (error.Fail()) {
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options.GetStream()->Printf("unable to read data");
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return true;
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}
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StringPrinter::ReadBufferAndDumpToStreamOptions dump_options(options);
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dump_options.SetData(
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DataExtractor(buffer_sp, target_sp->GetArchitecture().GetByteOrder(),
|
|
target_sp->GetArchitecture().GetAddressByteSize()));
|
|
dump_options.SetSourceSize(sourceSize);
|
|
dump_options.SetIsTruncated(is_truncated);
|
|
dump_options.SetNeedsZeroTermination(needs_zero_terminator);
|
|
if (needs_zero_terminator)
|
|
dump_options.SetBinaryZeroIsTerminator(true);
|
|
|
|
GetPrintableElementType print_style = (elem_type == StringElementType::ASCII)
|
|
? GetPrintableElementType::ASCII
|
|
: GetPrintableElementType::UTF8;
|
|
return DumpEncodedBufferToStream(print_style, ConvertFunction, dump_options);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadStringAndDumpToStream<StringElementType::UTF8>(
|
|
const ReadStringAndDumpToStreamOptions &options) {
|
|
return ReadEncodedBufferAndDumpToStream<llvm::UTF8>(StringElementType::UTF8,
|
|
options, nullptr);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadStringAndDumpToStream<StringElementType::UTF16>(
|
|
const ReadStringAndDumpToStreamOptions &options) {
|
|
return ReadEncodedBufferAndDumpToStream<llvm::UTF16>(
|
|
StringElementType::UTF16, options, llvm::ConvertUTF16toUTF8);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadStringAndDumpToStream<StringElementType::UTF32>(
|
|
const ReadStringAndDumpToStreamOptions &options) {
|
|
return ReadEncodedBufferAndDumpToStream<llvm::UTF32>(
|
|
StringElementType::UTF32, options, llvm::ConvertUTF32toUTF8);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadStringAndDumpToStream<StringElementType::ASCII>(
|
|
const ReadStringAndDumpToStreamOptions &options) {
|
|
return ReadEncodedBufferAndDumpToStream<char>(StringElementType::ASCII,
|
|
options, nullptr);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadBufferAndDumpToStream<StringElementType::UTF8>(
|
|
const ReadBufferAndDumpToStreamOptions &options) {
|
|
return DumpEncodedBufferToStream<llvm::UTF8>(GetPrintableElementType::UTF8,
|
|
nullptr, options);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadBufferAndDumpToStream<StringElementType::UTF16>(
|
|
const ReadBufferAndDumpToStreamOptions &options) {
|
|
return DumpEncodedBufferToStream(GetPrintableElementType::UTF8,
|
|
llvm::ConvertUTF16toUTF8, options);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadBufferAndDumpToStream<StringElementType::UTF32>(
|
|
const ReadBufferAndDumpToStreamOptions &options) {
|
|
return DumpEncodedBufferToStream(GetPrintableElementType::UTF8,
|
|
llvm::ConvertUTF32toUTF8, options);
|
|
}
|
|
|
|
template <>
|
|
bool StringPrinter::ReadBufferAndDumpToStream<StringElementType::ASCII>(
|
|
const ReadBufferAndDumpToStreamOptions &options) {
|
|
// Treat ASCII the same as UTF8.
|
|
//
|
|
// FIXME: This is probably not the right thing to do (well, it's debatable).
|
|
// If an ASCII-encoded string happens to contain a sequence of invalid bytes
|
|
// that forms a valid UTF8 character, we'll print out that character. This is
|
|
// good if you're playing fast and loose with encodings (probably good for
|
|
// std::string users), but maybe not so good if you care about your string
|
|
// formatter respecting the semantics of your selected string encoding. In
|
|
// the latter case you'd want to see the character byte sequence ('\x..'), not
|
|
// the UTF8 character itself.
|
|
return ReadBufferAndDumpToStream<StringElementType::UTF8>(options);
|
|
}
|
|
|
|
} // namespace formatters
|
|
|
|
} // namespace lldb_private
|