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json.d
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/**
* Code for generating .json descriptions of the module when passing the `-X` flag to dmd.
*
* Copyright: Copyright (C) 1999-2025 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/compiler/src/dmd/json.d, _json.d)
* Documentation: https://dlang.org/phobos/dmd_json.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/compiler/src/dmd/json.d
*/
module dmd.json;
import core.stdc.stdio;
import core.stdc.string;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.astenums;
import dmd.attrib;
import dmd.cond;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dimport;
import dmd.dmodule;
import dmd.dsymbol;
import dmd.dsymbolsem : include;
import dmd.dtemplate;
import dmd.errors;
import dmd.expression;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.location;
import dmd.mtype;
import dmd.common.outbuffer;
import dmd.rootobject;
import dmd.root.string;
import dmd.target;
import dmd.visitor;
version(Windows)
{
extern (C) char* _getcwd(char* buffer, size_t maxlen);
alias getcwd = _getcwd;
}
else
{
import core.sys.posix.unistd : getcwd;
}
private extern (C++) final class ToJsonVisitor : Visitor
{
alias visit = Visitor.visit;
public:
OutBuffer* buf;
int indentLevel;
const(char)[] filename;
extern (D) this(OutBuffer* buf) scope @safe
{
this.buf = buf;
}
void indent()
{
if (buf.length >= 1 && (*buf)[buf.length - 1] == '\n')
for (int i = 0; i < indentLevel; i++)
buf.writeByte(' ');
}
void removeComma()
{
if (buf.length >= 2 && (*buf)[buf.length - 2] == ',' && ((*buf)[buf.length - 1] == '\n' || (*buf)[buf.length - 1] == ' '))
buf.setsize(buf.length - 2);
}
void comma()
{
if (indentLevel > 0)
buf.writestring(",\n");
}
void stringStart()
{
buf.writeByte('\"');
}
void stringEnd()
{
buf.writeByte('\"');
}
extern(D) void stringPart(const char[] s)
{
foreach (char c; s)
{
switch (c)
{
case '\n':
buf.writestring("\\n");
break;
case '\r':
buf.writestring("\\r");
break;
case '\t':
buf.writestring("\\t");
break;
case '\"':
buf.writestring("\\\"");
break;
case '\\':
buf.writestring("\\\\");
break;
case '\b':
buf.writestring("\\b");
break;
case '\f':
buf.writestring("\\f");
break;
default:
if (c < 0x20)
buf.printf("\\u%04x", c);
else
{
// Note that UTF-8 chars pass through here just fine
buf.writeByte(c);
}
break;
}
}
}
// Json value functions
/*********************************
* Encode string into buf, and wrap it in double quotes.
*/
extern(D) void value(const char[] s)
{
stringStart();
stringPart(s);
stringEnd();
}
void value(int value)
{
if (value < 0)
{
buf.writeByte('-');
value = -value;
}
buf.print(value);
}
void valueBool(bool value)
{
buf.writestring(value ? "true" : "false");
}
/*********************************
* Item is an intented value and a comma, for use in arrays
*/
extern(D) void item(const char[] s)
{
indent();
value(s);
comma();
}
void item(int i)
{
indent();
value(i);
comma();
}
void itemBool(const bool b)
{
indent();
valueBool(b);
comma();
}
// Json array functions
void arrayStart()
{
indent();
buf.writestring("[\n");
indentLevel++;
}
void arrayEnd()
{
indentLevel--;
removeComma();
if (buf.length >= 2 && (*buf)[buf.length - 2] == '[' && (*buf)[buf.length - 1] == '\n')
buf.setsize(buf.length - 1);
else if (!(buf.length >= 1 && (*buf)[buf.length - 1] == '['))
{
buf.writestring("\n");
indent();
}
buf.writestring("]");
comma();
}
// Json object functions
void objectStart()
{
indent();
buf.writestring("{\n");
indentLevel++;
}
void objectEnd()
{
indentLevel--;
removeComma();
if (buf.length >= 2 && (*buf)[buf.length - 2] == '{' && (*buf)[buf.length - 1] == '\n')
buf.setsize(buf.length - 1);
else
{
buf.writestring("\n");
indent();
}
buf.writestring("}");
comma();
}
// Json object property functions
extern(D) void propertyStart(const char[] name)
{
indent();
value(name);
buf.writestring(" : ");
}
/**
Write the given string object property only if `s` is not null.
Params:
name = the name of the object property
s = the string value of the object property
*/
extern(D) void property(const char[] name, const char[] s)
{
if (s is null)
return;
propertyStart(name);
value(s);
comma();
}
/**
Write the given string object property.
Params:
name = the name of the object property
s = the string value of the object property
*/
extern(D) void requiredProperty(const char[] name, const char[] s)
{
propertyStart(name);
if (s is null)
buf.writestring("null");
else
value(s);
comma();
}
extern(D) void property(const char[] name, int i)
{
propertyStart(name);
value(i);
comma();
}
extern(D) void propertyBool(const char[] name, const bool b)
{
propertyStart(name);
valueBool(b);
comma();
}
extern(D) void property(const char[] name, TRUST trust)
{
final switch (trust)
{
case TRUST.default_:
// Should not be printed
//property(name, "default");
break;
case TRUST.system: return property(name, "system");
case TRUST.trusted: return property(name, "trusted");
case TRUST.safe: return property(name, "safe");
}
}
extern(D) void property(const char[] name, PURE purity)
{
final switch (purity)
{
case PURE.impure:
// Should not be printed
//property(name, "impure");
break;
case PURE.weak: return property(name, "weak");
case PURE.const_: return property(name, "strong");
case PURE.fwdref: return property(name, "fwdref");
}
}
extern(D) void property(const char[] name, const LINK linkage)
{
final switch (linkage)
{
case LINK.default_:
// Should not be printed
//property(name, "default");
break;
case LINK.d:
// Should not be printed
//property(name, "d");
break;
case LINK.system: return property(name, "system");
case LINK.c: return property(name, "c");
case LINK.cpp: return property(name, "cpp");
case LINK.windows: return property(name, "windows");
case LINK.objc: return property(name, "objc");
}
}
extern(D) void propertyStorageClass(const char[] name, STC stc)
{
stc &= STC.visibleStorageClasses;
if (stc)
{
propertyStart(name);
arrayStart();
while (stc)
{
auto p = stcToString(stc);
assert(p.length);
item(p);
}
arrayEnd();
}
}
extern(D) void property(const char[] linename, const char[] charname, Loc loc)
{
if (loc.isValid())
{
SourceLoc sl = SourceLoc(loc);
if (sl.filename.length > 0 && sl.filename != this.filename)
{
this.filename = sl.filename;
property("file", sl.filename);
}
if (sl.linnum)
{
property(linename, sl.linnum);
if (sl.charnum)
property(charname, sl.charnum);
}
}
}
extern(D) void property(const char[] name, Type type)
{
if (type)
{
property(name, type.toString());
}
}
extern(D) void property(const char[] name, const char[] deconame, Type type)
{
if (type)
{
if (type.deco)
property(deconame, type.deco.toDString);
else
property(name, type.toString());
}
}
extern(D) void property(const char[] name, Parameters* parameters)
{
if (parameters is null || parameters.length == 0)
return;
propertyStart(name);
arrayStart();
if (parameters)
{
for (size_t i = 0; i < parameters.length; i++)
{
Parameter p = (*parameters)[i];
objectStart();
if (p.ident)
property("name", p.ident.toString());
property("type", "deco", p.type);
propertyStorageClass("storageClass", p.storageClass);
if (p.defaultArg)
property("default", p.defaultArg.toString());
objectEnd();
}
}
arrayEnd();
}
/* ========================================================================== */
void jsonProperties(Dsymbol s)
{
if (s.isModule())
return;
if (!s.isTemplateDeclaration()) // TemplateDeclaration::kind() acts weird sometimes
{
property("name", s.toString());
if (s.isStaticCtorDeclaration())
{
property("kind", s.isSharedStaticCtorDeclaration()
? "shared static constructor" : "static constructor");
}
else if (s.isStaticDtorDeclaration())
{
property("kind", s.isSharedStaticDtorDeclaration()
? "shared static destructor" : "static destructor");
}
else
property("kind", s.kind.toDString);
}
// TODO: How about package(names)?
property("protection", visibilityToString(s.visible().kind));
if (EnumMember em = s.isEnumMember())
{
if (em.origValue)
property("value", em.origValue.toString());
}
property("comment", s.comment.toDString);
property("line", "char", s.loc);
}
void jsonProperties(Declaration d)
{
if (d.storage_class & STC.local)
return;
jsonProperties(cast(Dsymbol)d);
propertyStorageClass("storageClass", d.storage_class);
property("linkage", d._linkage);
property("type", "deco", d.type);
// Emit originalType if it differs from type
if (d.type != d.originalType && d.originalType)
{
auto ostr = d.originalType.toString();
if (d.type)
{
auto tstr = d.type.toString();
if (ostr != tstr)
{
//printf("tstr = %s, ostr = %s\n", tstr, ostr);
property("originalType", ostr);
}
}
else
property("originalType", ostr);
}
}
void jsonProperties(TemplateDeclaration td)
{
jsonProperties(cast(Dsymbol)td);
if (td.onemember && td.onemember.isCtorDeclaration())
property("name", "this"); // __ctor -> this
else
property("name", td.ident.toString()); // Foo(T) -> Foo
}
/* ========================================================================== */
override void visit(Dsymbol s)
{
}
override void visit(Module s)
{
objectStart();
if (s.md)
property("name", s.md.toString());
property("kind", s.kind.toDString);
filename = s.srcfile.toString();
property("file", filename);
property("comment", s.comment.toDString);
propertyStart("members");
arrayStart();
for (size_t i = 0; i < s.members.length; i++)
{
(*s.members)[i].accept(this);
}
arrayEnd();
objectEnd();
}
override void visit(Import s)
{
if (s.id == Id.object)
return;
objectStart();
propertyStart("name");
stringStart();
foreach (const pid; s.packages){
stringPart(pid.toString());
buf.writeByte('.');
}
stringPart(s.id.toString());
stringEnd();
comma();
property("kind", s.kind.toDString);
property("comment", s.comment.toDString);
property("line", "char", s.loc);
if (s.visible().kind != Visibility.Kind.public_)
property("protection", visibilityToString(s.visible().kind));
if (s.aliasId)
property("alias", s.aliasId.toString());
bool hasRenamed = false;
bool hasSelective = false;
for (size_t i = 0; i < s.aliases.length; i++)
{
// avoid empty "renamed" and "selective" sections
if (hasRenamed && hasSelective)
break;
else if (s.aliases[i])
hasRenamed = true;
else
hasSelective = true;
}
if (hasRenamed)
{
// import foo : alias1 = target1;
propertyStart("renamed");
objectStart();
for (size_t i = 0; i < s.aliases.length; i++)
{
const name = s.names[i];
const _alias = s.aliases[i];
if (_alias)
property(_alias.toString(), name.toString());
}
objectEnd();
}
if (hasSelective)
{
// import foo : target1;
propertyStart("selective");
arrayStart();
foreach (i, name; s.names)
{
if (!s.aliases[i])
item(name.toString());
}
arrayEnd();
}
objectEnd();
}
override void visit(AttribDeclaration d)
{
Dsymbols* ds = d.include(null);
if (ds)
{
for (size_t i = 0; i < ds.length; i++)
{
Dsymbol s = (*ds)[i];
s.accept(this);
}
}
}
override void visit(ConditionalDeclaration d)
{
if (d.condition.inc != Include.notComputed)
{
visit(cast(AttribDeclaration)d);
return; // Don't visit the if/else bodies again below
}
Dsymbols* ds = d.decl ? d.decl : d.elsedecl;
for (size_t i = 0; i < ds.length; i++)
{
Dsymbol s = (*ds)[i];
s.accept(this);
}
}
override void visit(TypeInfoDeclaration d)
{
}
override void visit(PostBlitDeclaration d)
{
}
override void visit(Declaration d)
{
objectStart();
//property("unknown", "declaration");
jsonProperties(d);
objectEnd();
}
override void visit(AggregateDeclaration d)
{
objectStart();
jsonProperties(d);
ClassDeclaration cd = d.isClassDeclaration();
if (cd)
{
if (cd.baseClass && cd.baseClass.ident != Id.Object)
{
property("base", cd.baseClass.toPrettyChars(true).toDString);
}
if (cd.interfaces.length)
{
propertyStart("interfaces");
arrayStart();
foreach (b; cd.interfaces)
{
item(b.sym.toPrettyChars(true).toDString);
}
arrayEnd();
}
}
if (d.members)
{
propertyStart("members");
arrayStart();
for (size_t i = 0; i < d.members.length; i++)
{
Dsymbol s = (*d.members)[i];
s.accept(this);
}
arrayEnd();
}
objectEnd();
}
override void visit(FuncDeclaration d)
{
objectStart();
jsonProperties(d);
TypeFunction tf = cast(TypeFunction)d.type;
if (tf && tf.ty == Tfunction)
property("parameters", tf.parameterList.parameters);
property("endline", "endchar", d.endloc);
if (d.foverrides.length)
{
propertyStart("overrides");
arrayStart();
for (size_t i = 0; i < d.foverrides.length; i++)
{
FuncDeclaration fd = d.foverrides[i];
item(fd.toPrettyChars().toDString);
}
arrayEnd();
}
if (d.fdrequire)
{
propertyStart("in");
d.fdrequire.accept(this);
}
if (d.fdensure)
{
propertyStart("out");
d.fdensure.accept(this);
}
objectEnd();
}
override void visit(TemplateDeclaration d)
{
objectStart();
// TemplateDeclaration::kind returns the kind of its Aggregate onemember, if it is one
property("kind", "template");
jsonProperties(d);
propertyStart("parameters");
arrayStart();
for (size_t i = 0; i < d.parameters.length; i++)
{
TemplateParameter s = (*d.parameters)[i];
objectStart();
property("name", s.ident.toString());
if (auto type = s.isTemplateTypeParameter())
{
if (s.isTemplateThisParameter())
property("kind", "this");
else
property("kind", "type");
property("type", "deco", type.specType);
property("default", "defaultDeco", type.defaultType);
}
if (auto value = s.isTemplateValueParameter())
{
property("kind", "value");
property("type", "deco", value.valType);
if (value.specValue)
property("specValue", value.specValue.toString());
if (value.defaultValue)
property("defaultValue", value.defaultValue.toString());
}
if (auto _alias = s.isTemplateAliasParameter())
{
property("kind", "alias");
property("type", "deco", _alias.specType);
if (_alias.specAlias)
property("specAlias", _alias.specAlias.toString());
if (_alias.defaultAlias)
property("defaultAlias", _alias.defaultAlias.toString());
}
if (auto tuple = s.isTemplateTupleParameter())
{
property("kind", "tuple");
}
objectEnd();
}
arrayEnd();
Expression expression = d.constraint;
if (expression)
{
property("constraint", expression.toString());
}
propertyStart("members");
arrayStart();
for (size_t i = 0; i < d.members.length; i++)
{
Dsymbol s = (*d.members)[i];
s.accept(this);
}
arrayEnd();
objectEnd();
}
override void visit(EnumDeclaration d)
{
if (d.isAnonymous())
{
if (d.members)
{
for (size_t i = 0; i < d.members.length; i++)
{
Dsymbol s = (*d.members)[i];
s.accept(this);
}
}
return;
}
objectStart();
jsonProperties(d);
property("base", "baseDeco", d.memtype);
if (d.members)
{
propertyStart("members");
arrayStart();
for (size_t i = 0; i < d.members.length; i++)
{
Dsymbol s = (*d.members)[i];
s.accept(this);
}
arrayEnd();
}
objectEnd();
}
override void visit(EnumMember s)
{
objectStart();
jsonProperties(cast(Dsymbol)s);
property("type", "deco", s.origType);
objectEnd();
}
override void visit(VarDeclaration d)
{
if (d.storage_class & STC.local)
return;
objectStart();
jsonProperties(d);
if (d._init)
property("init", toString(d._init));
if (d.isField())
property("offset", d.offset);
if (!d.alignment.isUnknown() && !d.alignment.isDefault())
property("align", d.alignment.get());
objectEnd();
}
override void visit(TemplateMixin d)
{
objectStart();
jsonProperties(d);
objectEnd();
}
/**
Generate an array of module objects that represent the syntax of each
"root module".
Params:
modules = array of the "root modules"
*/
private void generateModules(ref Modules modules)
{
arrayStart();
foreach (m; modules)
{
if (global.params.v.verbose)
message("json gen %s", m.toChars());
m.accept(this);
}
arrayEnd();
}
/**
Generate the "compilerInfo" object which contains information about the compiler
such as the filename, version, supported features, etc.
*/
private void generateCompilerInfo()
{
import dmd.target : target;
objectStart();
requiredProperty("vendor", global.compileEnv.vendor);
requiredProperty("version", global.versionString());
property("__VERSION__", global.versionNumber());
requiredProperty("interface", determineCompilerInterface());
property("size_t", size_t.sizeof);
propertyStart("platforms");
arrayStart();
if (target.os == Target.OS.Windows)
{
item("windows");
}
else
{
item("posix");
if (target.os == Target.OS.linux)
item("linux");
else if (target.os == Target.OS.OSX)
item("osx");
else if (target.os == Target.OS.FreeBSD)
{
item("freebsd");
item("bsd");
}
else if (target.os == Target.OS.OpenBSD)
{
item("openbsd");
item("bsd");
}
else if (target.os == Target.OS.Solaris)
{
item("solaris");
item("bsd");
}
}
arrayEnd();
propertyStart("architectures");
arrayStart();
item(target.architectureName);
arrayEnd();
propertyStart("predefinedVersions");
arrayStart();
foreach (const versionid; global.versionids)
{
item(versionid.toString());
}
arrayEnd();
propertyStart("supportedFeatures");
{
objectStart();
scope(exit) objectEnd();
propertyBool("includeImports", true);
}
objectEnd();
}
/**
Generate the "buildInfo" object which contains information specific to the
current build such as CWD, importPaths, configFile, etc.
*/
private void generateBuildInfo()
{
objectStart();
requiredProperty("cwd", getcwd(null, 0).toDString);
requiredProperty("argv0", global.params.argv0);
requiredProperty("config", global.inifilename);
requiredProperty("libName", global.params.libname);
propertyStart("importPaths");
arrayStart();
foreach (importPath; global.params.imppath[])
{
item(importPath.path.toDString);
}
arrayEnd();
propertyStart("objectFiles");
arrayStart();
foreach (objfile; global.params.objfiles)
{
item(objfile.toDString);
}
arrayEnd();
propertyStart("libraryFiles");
arrayStart();
foreach (lib; global.params.libfiles)
{
item(lib.toDString);
}
arrayEnd();
propertyStart("ddocFiles");
arrayStart();
foreach (ddocFile; global.params.ddoc.files)
{
item(ddocFile.toDString);
}
arrayEnd();
requiredProperty("mapFile", global.params.mapfile);
requiredProperty("resourceFile", global.params.resfile);
requiredProperty("defFile", global.params.deffile);
objectEnd();
}
/**
Generate the "semantics" object which contains a 'modules' field representing
semantic information about all the modules used in the compilation such as
module name, isRoot, contentImportedFiles, etc.
*/
private void generateSemantics()
{
objectStart();
propertyStart("modules");
arrayStart();
foreach (m; Module.amodules)
{
objectStart();
requiredProperty("name", m.md ? m.md.toString() : null);
requiredProperty("file", m.srcfile.toString());
propertyBool("isRoot", m.isRoot());
if(m.contentImportedFiles.length > 0)
{
propertyStart("contentImports");
arrayStart();
foreach (file; m.contentImportedFiles)
{
item(file.toDString);
}
arrayEnd();
}
objectEnd();
}
arrayEnd();
objectEnd();
}
}
/***********************************
* Generate json for the modules.
* Params:
* modules = array of Modules
* buf = write json output to buf
*/
void json_generate(ref Modules modules, ref OutBuffer buf)
{
scope ToJsonVisitor json = new ToJsonVisitor(&buf);
// write trailing newline
scope(exit) buf.writeByte('\n');
if (global.params.jsonFieldFlags == 0)
{
// Generate the original format, which is just an array
// of modules representing their syntax.
json.generateModules(modules);
json.removeComma();
return;
}
// Generate the new format which is an object where each