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errors.d
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errors.d
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/**
* Functions for raising errors.
*
* Copyright: Copyright (C) 1999-2024 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/errors.d, _errors.d)
* Documentation: https://dlang.org/phobos/dmd_errors.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/errors.d
*/
module dmd.errors;
public import core.stdc.stdarg;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import dmd.errorsink;
import dmd.globals;
import dmd.location;
import dmd.common.outbuffer;
import dmd.root.rmem;
import dmd.root.string;
import dmd.console;
nothrow:
/// Constants used to discriminate kinds of error messages.
enum ErrorKind
{
warning,
deprecation,
error,
tip,
message,
}
/***************************
* Error message sink for D compiler.
*/
class ErrorSinkCompiler : ErrorSink
{
nothrow:
extern (C++):
override:
void error(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.error);
va_end(ap);
}
void errorSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.error);
va_end(ap);
}
void warning(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.warning);
va_end(ap);
}
void warningSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.warning);
va_end(ap);
}
void deprecation(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.deprecation);
va_end(ap);
}
void deprecationSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.deprecation);
va_end(ap);
}
void message(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.message);
va_end(ap);
}
}
/**
* Color highlighting to classify messages
*/
enum Classification : Color
{
error = Color.brightRed, /// for errors
gagged = Color.brightBlue, /// for gagged errors
warning = Color.brightYellow, /// for warnings
deprecation = Color.brightCyan, /// for deprecations
tip = Color.brightGreen, /// for tip messages
}
static if (__VERSION__ < 2092)
private extern (C++) void noop(const ref Loc loc, const(char)* format, ...) {}
else
pragma(printf) private extern (C++) void noop(const ref Loc loc, const(char)* format, ...) {}
package auto previewErrorFunc(bool isDeprecated, FeatureState featureState) @safe @nogc pure nothrow
{
with (FeatureState) final switch (featureState)
{
case enabled:
return &error;
case disabled:
return &noop;
case default_:
return isDeprecated ? &noop : &deprecation;
}
}
package auto previewSupplementalFunc(bool isDeprecated, FeatureState featureState) @safe @nogc pure nothrow
{
with (FeatureState) final switch (featureState)
{
case enabled:
return &errorSupplemental;
case disabled:
return &noop;
case default_:
return isDeprecated ? &noop : &deprecationSupplemental;
}
}
/**
* Print an error message, increasing the global error count.
* Params:
* loc = location of error
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void error(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.error);
va_end(ap);
}
else
pragma(printf) extern (C++) void error(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.error);
va_end(ap);
}
/**
* Same as above, but takes a filename and line information arguments as separate parameters.
* Params:
* filename = source file of error
* linnum = line in the source file
* charnum = column number on the line
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void error(const(char)* filename, uint linnum, uint charnum, const(char)* format, ...)
{
const loc = Loc(filename, linnum, charnum);
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.error);
va_end(ap);
}
else
pragma(printf) extern (C++) void error(const(char)* filename, uint linnum, uint charnum, const(char)* format, ...)
{
const loc = Loc(filename, linnum, charnum);
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.error);
va_end(ap);
}
/**
* Print additional details about an error message.
* Doesn't increase the error count or print an additional error prefix.
* Params:
* loc = location of error
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void errorSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.error);
va_end(ap);
}
else
pragma(printf) extern (C++) void errorSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.error);
va_end(ap);
}
/**
* Print a warning message, increasing the global warning count.
* Params:
* loc = location of warning
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void warning(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.warning);
va_end(ap);
}
else
pragma(printf) extern (C++) void warning(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.warning);
va_end(ap);
}
/**
* Print additional details about a warning message.
* Doesn't increase the warning count or print an additional warning prefix.
* Params:
* loc = location of warning
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void warningSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.warning);
va_end(ap);
}
else
pragma(printf) extern (C++) void warningSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.warning);
va_end(ap);
}
/**
* Print a deprecation message, may increase the global warning or error count
* depending on whether deprecations are ignored.
* Params:
* loc = location of deprecation
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void deprecation(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.deprecation);
va_end(ap);
}
else
pragma(printf) extern (C++) void deprecation(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.deprecation);
va_end(ap);
}
/**
* Print additional details about a deprecation message.
* Doesn't increase the error count, or print an additional deprecation prefix.
* Params:
* loc = location of deprecation
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void deprecationSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.deprecation);
va_end(ap);
}
else
pragma(printf) extern (C++) void deprecationSupplemental(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReportSupplemental(loc, format, ap, ErrorKind.deprecation);
va_end(ap);
}
/**
* Print a verbose message.
* Doesn't prefix or highlight messages.
* Params:
* loc = location of message
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void message(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.message);
va_end(ap);
}
else
pragma(printf) extern (C++) void message(const ref Loc loc, const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(loc, format, ap, ErrorKind.message);
va_end(ap);
}
/**
* Same as above, but doesn't take a location argument.
* Params:
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void message(const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(Loc.initial, format, ap, ErrorKind.message);
va_end(ap);
}
else
pragma(printf) extern (C++) void message(const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(Loc.initial, format, ap, ErrorKind.message);
va_end(ap);
}
/**
* The type of the diagnostic handler
* see verrorReport for arguments
* Returns: true if error handling is done, false to continue printing to stderr
*/
alias DiagnosticHandler = bool delegate(const ref Loc location, Color headerColor, const(char)* header, const(char)* messageFormat, va_list args, const(char)* prefix1, const(char)* prefix2);
/**
* The diagnostic handler.
* If non-null it will be called for every diagnostic message issued by the compiler.
* If it returns false, the message will be printed to stderr as usual.
*/
__gshared DiagnosticHandler diagnosticHandler;
/**
* Print a tip message with the prefix and highlighting.
* Params:
* format = printf-style format specification
* ... = printf-style variadic arguments
*/
static if (__VERSION__ < 2092)
extern (C++) void tip(const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(Loc.initial, format, ap, ErrorKind.tip);
va_end(ap);
}
else
pragma(printf) extern (C++) void tip(const(char)* format, ...)
{
va_list ap;
va_start(ap, format);
verrorReport(Loc.initial, format, ap, ErrorKind.tip);
va_end(ap);
}
// Encapsulates an error as described by its location, format message, and kind.
private struct ErrorInfo
{
this(const ref Loc loc, const ErrorKind kind, const(char)* p1 = null, const(char)* p2 = null) @safe @nogc pure nothrow
{
this.loc = loc;
this.p1 = p1;
this.p2 = p2;
this.kind = kind;
}
const Loc loc; // location of error
Classification headerColor; // color to set `header` output to
const(char)* p1; // additional message prefix
const(char)* p2; // additional message prefix
const ErrorKind kind; // kind of error being printed
bool supplemental; // true if supplemental error
}
/**
* Implements $(D error), $(D warning), $(D deprecation), $(D message), and
* $(D tip). Report a diagnostic error, taking a va_list parameter, and
* optionally additional message prefixes. Whether the message gets printed
* depends on runtime values of DiagnosticReporting and global gagging.
* Params:
* loc = location of error
* format = printf-style format specification
* ap = printf-style variadic arguments
* kind = kind of error being printed
* p1 = additional message prefix
* p2 = additional message prefix
*/
extern (C++) void verrorReport(const ref Loc loc, const(char)* format, va_list ap, ErrorKind kind, const(char)* p1 = null, const(char)* p2 = null)
{
auto info = ErrorInfo(loc, kind, p1, p2);
final switch (info.kind)
{
case ErrorKind.error:
global.errors++;
if (!global.gag)
{
info.headerColor = Classification.error;
verrorPrint(format, ap, info);
if (global.params.v.errorLimit && global.errors >= global.params.v.errorLimit)
{
fprintf(stderr, "error limit (%d) reached, use `-verrors=0` to show all\n", global.params.v.errorLimit);
fatal(); // moderate blizzard of cascading messages
}
}
else
{
if (global.params.v.showGaggedErrors)
{
info.headerColor = Classification.gagged;
verrorPrint(format, ap, info);
}
global.gaggedErrors++;
}
break;
case ErrorKind.deprecation:
if (global.params.useDeprecated == DiagnosticReporting.error)
goto case ErrorKind.error;
else if (global.params.useDeprecated == DiagnosticReporting.inform)
{
if (!global.gag)
{
global.deprecations++;
if (global.params.v.errorLimit == 0 || global.deprecations <= global.params.v.errorLimit)
{
info.headerColor = Classification.deprecation;
verrorPrint(format, ap, info);
}
}
else
{
global.gaggedWarnings++;
}
}
break;
case ErrorKind.warning:
if (global.params.warnings != DiagnosticReporting.off)
{
if (!global.gag)
{
info.headerColor = Classification.warning;
verrorPrint(format, ap, info);
if (global.params.warnings == DiagnosticReporting.error)
global.warnings++;
}
else
{
global.gaggedWarnings++;
}
}
break;
case ErrorKind.tip:
if (!global.gag)
{
info.headerColor = Classification.tip;
verrorPrint(format, ap, info);
}
break;
case ErrorKind.message:
const p = info.loc.toChars();
if (*p)
{
fprintf(stdout, "%s: ", p);
mem.xfree(cast(void*)p);
}
OutBuffer tmp;
tmp.vprintf(format, ap);
fputs(tmp.peekChars(), stdout);
fputc('\n', stdout);
fflush(stdout); // ensure it gets written out in case of compiler aborts
break;
}
}
/**
* Implements $(D errorSupplemental), $(D warningSupplemental), and
* $(D deprecationSupplemental). Report an addition diagnostic error, taking a
* va_list parameter. Whether the message gets printed depends on runtime
* values of DiagnosticReporting and global gagging.
* Params:
* loc = location of error
* format = printf-style format specification
* ap = printf-style variadic arguments
* kind = kind of error being printed
*/
extern (C++) void verrorReportSupplemental(const ref Loc loc, const(char)* format, va_list ap, ErrorKind kind)
{
auto info = ErrorInfo(loc, kind);
info.supplemental = true;
switch (info.kind)
{
case ErrorKind.error:
if (global.gag)
{
if (!global.params.v.showGaggedErrors)
return;
info.headerColor = Classification.gagged;
}
else
info.headerColor = Classification.error;
verrorPrint(format, ap, info);
break;
case ErrorKind.deprecation:
if (global.params.useDeprecated == DiagnosticReporting.error)
goto case ErrorKind.error;
else if (global.params.useDeprecated == DiagnosticReporting.inform && !global.gag)
{
info.headerColor = Classification.deprecation;
verrorPrint(format, ap, info);
}
break;
case ErrorKind.warning:
if (global.params.warnings != DiagnosticReporting.off && !global.gag)
{
info.headerColor = Classification.warning;
verrorPrint(format, ap, info);
}
break;
default:
assert(false, "internal error: unhandled kind in error report");
}
}
/**
* Just print to stderr, doesn't care about gagging.
* (format,ap) text within backticks gets syntax highlighted.
* Params:
* format = printf-style format specification
* ap = printf-style variadic arguments
* info = context of error
*/
private void verrorPrint(const(char)* format, va_list ap, ref ErrorInfo info)
{
const(char)* header; // title of error message
if (info.supplemental)
header = " ";
else
{
final switch (info.kind)
{
case ErrorKind.error: header = "Error: "; break;
case ErrorKind.deprecation: header = "Deprecation: "; break;
case ErrorKind.warning: header = "Warning: "; break;
case ErrorKind.tip: header = " Tip: "; break;
case ErrorKind.message: assert(0);
}
}
if (diagnosticHandler !is null &&
diagnosticHandler(info.loc, info.headerColor, header, format, ap, info.p1, info.p2))
return;
if (global.params.v.showGaggedErrors && global.gag)
fprintf(stderr, "(spec:%d) ", global.gag);
auto con = cast(Console) global.console;
const p = info.loc.toChars();
if (con)
con.setColorBright(true);
if (*p)
{
fprintf(stderr, "%s: ", p);
mem.xfree(cast(void*)p);
}
if (con)
con.setColor(info.headerColor);
fputs(header, stderr);
if (con)
con.resetColor();
OutBuffer tmp;
if (info.p1)
{
tmp.writestring(info.p1);
tmp.writestring(" ");
}
if (info.p2)
{
tmp.writestring(info.p2);
tmp.writestring(" ");
}
tmp.vprintf(format, ap);
if (con && strchr(tmp.peekChars(), '`'))
{
colorSyntaxHighlight(tmp);
writeHighlights(con, tmp);
}
else
fputs(tmp.peekChars(), stderr);
fputc('\n', stderr);
__gshared Loc old_loc;
Loc loc = info.loc;
if (global.params.v.printErrorContext &&
// ignore supplemental messages with same loc
(loc != old_loc || !info.supplemental) &&
// ignore invalid files
loc != Loc.initial &&
// ignore mixins for now
!loc.filename.strstr(".d-mixin-") &&
!global.params.mixinOut.doOutput)
{
import dmd.root.filename : FileName;
const fileName = FileName(loc.filename.toDString);
if (auto text = global.fileManager.getFileContents(fileName))
{
auto range = dmd.root.string.splitLines(cast(const(char[])) text);
size_t linnum;
foreach (line; range)
{
++linnum;
if (linnum != loc.linnum)
continue;
if (loc.charnum < line.length)
{
fprintf(stderr, "%.*s\n", cast(int)line.length, line.ptr);
// The number of column bytes and the number of display columns
// occupied by a character are not the same for non-ASCII charaters.
// https://issues.dlang.org/show_bug.cgi?id=21849
size_t col = 0;
while (col < loc.charnum - 1)
{
import dmd.root.utf : utf_decodeChar;
dchar u;
const msg = utf_decodeChar(line, col, u);
assert(msg is null, msg);
fputc(' ', stderr);
}
fputc('^', stderr);
fputc('\n', stderr);
}
break;
}
}
}
old_loc = loc;
fflush(stderr); // ensure it gets written out in case of compiler aborts
}
/**
* The type of the fatal error handler
* Returns: true if error handling is done, false to do exit(EXIT_FAILURE)
*/
alias FatalErrorHandler = bool delegate();
/**
* The fatal error handler.
* If non-null it will be called for every fatal() call issued by the compiler.
*/
__gshared FatalErrorHandler fatalErrorHandler;
/**
* Call this after printing out fatal error messages to clean up and exit the
* compiler. You can also set a fatalErrorHandler to override this behaviour.
*/
extern (C++) void fatal()
{
if (fatalErrorHandler && fatalErrorHandler())
return;
exit(EXIT_FAILURE);
}
/**
* Try to stop forgetting to remove the breakpoints from
* release builds.
*/
extern (C++) void halt() @safe
{
assert(0);
}
/**
* Scan characters in `buf`. Assume text enclosed by `...`
* is D source code, and color syntax highlight it.
* Modify contents of `buf` with highlighted result.
* Many parallels to ddoc.highlightText().
* Params:
* buf = text containing `...` code to highlight
*/
private void colorSyntaxHighlight(ref OutBuffer buf)
{
//printf("colorSyntaxHighlight('%.*s')\n", cast(int)buf.length, buf[].ptr);
bool inBacktick = false;
size_t iCodeStart = 0;
size_t offset = 0;
for (size_t i = offset; i < buf.length; ++i)
{
char c = buf[i];
switch (c)
{
case '`':
if (inBacktick)
{
inBacktick = false;
OutBuffer codebuf;
codebuf.write(buf[iCodeStart .. i]);
codebuf.writeByte(0);
// escape the contents, but do not perform highlighting except for DDOC_PSYMBOL
colorHighlightCode(codebuf);
buf.remove(iCodeStart, i - iCodeStart);
immutable pre = "";
i = buf.insert(iCodeStart, pre);
i = buf.insert(i, codebuf[]);
break;
}
inBacktick = true;
iCodeStart = i + 1;
break;
default:
break;
}
}
}
/**
* Embed these highlighting commands in the text stream.
* HIGHLIGHT.Escape indicates a Color follows.
*/
enum HIGHLIGHT : ubyte
{
Default = Color.black, // back to whatever the console is set at
Escape = '\xFF', // highlight Color follows
Identifier = Color.white,
Keyword = Color.white,
Literal = Color.white,
Comment = Color.darkGray,
Other = Color.cyan, // other tokens
}
/**
* Highlight code for CODE section.
* Rewrite the contents of `buf` with embedded highlights.
* Analogous to doc.highlightCode2()
*/
private void colorHighlightCode(ref OutBuffer buf)
{
import dmd.lexer;
import dmd.tokens;
__gshared int nested;
if (nested)
{
// Should never happen, but don't infinitely recurse if it does
--nested;
return;
}
++nested;
scope Lexer lex = new Lexer(null, cast(char*)buf[].ptr, 0, buf.length - 1, 0, 1, global.errorSinkNull, &global.compileEnv);
OutBuffer res;
const(char)* lastp = cast(char*)buf[].ptr;
//printf("colorHighlightCode('%.*s')\n", cast(int)(buf.length - 1), buf[].ptr);
res.reserve(buf.length);
res.writeByte(HIGHLIGHT.Escape);
res.writeByte(HIGHLIGHT.Other);
while (1)
{
Token tok;
lex.scan(&tok);
res.writestring(lastp[0 .. tok.ptr - lastp]);
HIGHLIGHT highlight;
switch (tok.value)
{
case TOK.identifier:
highlight = HIGHLIGHT.Identifier;
break;
case TOK.comment:
highlight = HIGHLIGHT.Comment;
break;
case TOK.int32Literal:
..
case TOK.dcharLiteral:
case TOK.string_:
highlight = HIGHLIGHT.Literal;
break;
default:
if (tok.isKeyword())
highlight = HIGHLIGHT.Keyword;
break;
}
if (highlight != HIGHLIGHT.Default)
{
res.writeByte(HIGHLIGHT.Escape);
res.writeByte(highlight);
res.writestring(tok.ptr[0 .. lex.p - tok.ptr]);
res.writeByte(HIGHLIGHT.Escape);
res.writeByte(HIGHLIGHT.Other);
}
else
res.writestring(tok.ptr[0 .. lex.p - tok.ptr]);
if (tok.value == TOK.endOfFile)
break;
lastp = lex.p;
}
res.writeByte(HIGHLIGHT.Escape);
res.writeByte(HIGHLIGHT.Default);
//printf("res = '%.*s'\n", cast(int)buf.length, buf[].ptr);
buf.setsize(0);
buf.write(&res);
--nested;
}
/**
* Write the buffer contents with embedded highlights to stderr.
* Params:
* buf = highlighted text
*/
private void writeHighlights(Console con, ref const OutBuffer buf)
{
bool colors;
scope (exit)
{
/* Do not mess up console if highlighting aborts
*/
if (colors)
con.resetColor();
}
for (size_t i = 0; i < buf.length; ++i)
{
const c = buf[i];
if (c == HIGHLIGHT.Escape)
{
const color = buf[++i];
if (color == HIGHLIGHT.Default)
{
con.resetColor();
colors = false;
}
else
if (color == Color.white)
{
con.resetColor();
con.setColorBright(true);
colors = true;
}
else
{
con.setColor(cast(Color)color);
colors = true;
}
}
else
fputc(c, con.fp);
}
}