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# dmd.func

Compiler implementation of the D programming language.
Authors:
Walter Bright
License:
Boost License 1.0

Source: func.d

Documentation:

https: //dlang.org/phobos/dmd_func.html

Coverage:

https: //codecov.io/gh/dlang/dmd/src/master/src/dmd/`func`.d

enum `ILS`: int;
  Inline Status
  `ILSuninitialized`
    not computed yet
  `ILSno`
    cannot inline
  `ILSyes`
    can inline
class `FuncDeclaration`: dmd.declaration.Declaration;
  Types* `fthrows`;
    Array of Type's of exceptions (not used)
  Statement `frequire`;
    in contract body
  Statement `fensure`;
    out contract body
  Statement `fbody`;
    function body
  FuncDeclarations `foverrides`;
    functions this function overrides
  FuncDeclaration `fdrequire`;
    function that does the in contract
  FuncDeclaration `fdensure`;
    function that does the out contract
  const(char)* `mangleString`;
    mangled symbol created from mangleExact()
  Identifier `outId`;
    identifier for out statement
  VarDeclaration `vresult`;
    variable corresponding to outId
  LabelDsymbol `returnLabel`;
    where the return goes
  VarDeclaration `vthis`;
    'this' parameter (member and nested)
  VarDeclaration `v_arguments`;
    'arguments' parameter
  ObjcSelector* `selector`;
    Objective-C method `selector` (member function only)
  VarDeclaration `v_argptr`;
    'argptr' variable
  VarDeclarations* `parameters`;
    Array of VarDeclaration's for `parameters`
  DsymbolTable `labtab`;
    statement label symbol table
  Dsymbol `overnext`;
    next in overload list
  FuncDeclaration `overnext0`;
    next in overload list (only used during IFTI)
  Loc `endloc`;
    location of closing curly bracket
  int `vtblIndex`;
    for member functions, index into vtbl[]
  bool `naked`;
    `true` if `naked`
  bool `generated`;
    `true` if function was `generated` by the compiler rather than
  ILS `inlineStatusStmt`;
    supplied by the user
  CompiledCtfeFunction* `ctfeCode`;
    Compiled code for interpreter (not actually)
  int `inlineNest`;
    !=0 if nested inline
  bool `isArrayOp`;
    `true` if array operation
  bool `eh_none`;
    `true` if no exception unwinding is needed
  bool `semantic3Errors`;
    `true` if errors in semantic3 this function's frame ptr
  ForeachStatement `fes`;
    if foreach body, this is the foreach
  BaseClass* `interfaceVirtual`;
    if virtual, but only appears in base interface vtbl[]
  bool `introducing`;
    `true` if '`introducing`' function
  Type `tintro`;
    if !=NULL, then this is the type of the 'introducing' function this one is overriding
  bool `inferRetType`;
    `true` if return type is to be inferred
  StorageClass `storage_class2`;
    storage class for template onemember's
  int `hasReturnExp`;
    1 if there's a return exp; statement
    2 if there's a throw statement
    4 if there's an assert(0)
    8 if there's inline asm
    16 if there are multiple return statements
  bool `nrvo_can`;
    `true` means we can do NRVO
  VarDeclaration `nrvo_var`;
    variable to replace with shidden
  Symbol* `shidden`;
    hidden pointer passed to function
  GotoStatements* `gotos`;
    Gotos with forward references
  BUILTIN `builtin`;
    set if this is a known, `builtin` function we can evaluate at compile time
  int `tookAddressOf`;
    set if someone took the address of this function
  VarDeclarations `closureVars`;
    local variables in this function which are referenced by nested functions
  FuncDeclarations `siblingCallers`;
    Sibling nested functions which called this one
  uint `flags`;
    FUNCFLAG.xxxxx
  final bool `functionSemantic`();
    Resolve forward reference of function signature - parameter types, return type, and attributes. Returns `false` if any errors exist in the signature.
  final bool `functionSemantic3`();
    Resolve forward reference of function body. Returns `false` if any errors exist in the body.
  final bool `checkForwardRef`(Loc `loc`);
    Check that this function type is properly resolved. If not, report "forward reference error" and return `true`.
  final int `overrides`(FuncDeclaration `fd`);
    Determine if 'this' `overrides` `fd`. Return !=0 if it does.
  final int `findVtblIndex`(Dsymbols* `vtbl`, int `dim`, bool `fix17349` = true);
    Find index of function in `vtbl`[0..`dim`] that this function overrides. Prefer an exact match to a covariant one.
    Parameters:

    bool `fix17349` | enable fix https://issues.dlang.org/show_bug.cgi?id=17349

    Returns:
    -1 didn't find one -2 can't determine because of forward references
  final BaseClass* `overrideInterface`();
    If function a function in a base class, return that base class.
    Parameters:

    cd | class that function is in

    Returns:
    base class if overriding, `null` if not
  bool `overloadInsert`(Dsymbol `s`);
    Overload this FuncDeclaration with the new one f. Return `true` if successful; i.e. no conflict.
  final FuncDeclaration `overloadExactMatch`(Type `t`);
    Find function in overload list that exactly matches `t`.
  final FuncDeclaration `overloadModMatch`(Loc `loc`, Type `tthis`, ref bool `hasOverloads`);
    Find function in overload list that matches to the 'this' modifier. There's four result types.
    1. If the '`tthis`' matches only one candidate, it's an "exact match". Returns the function and '`hasOverloads`' is set to `false`. eg. If '`tthis`" is mutable and there's only one mutable method. 2. If there's two or more match candidates, but a candidate function will be a "better match". Returns the better match function but '`hasOverloads`' is set to `true`. eg. If '`tthis`' is mutable, and there's both mutable and const methods, the mutable method will be a better match. 3. If there's two or more match candidates, but there's no better match, Returns `null` and '`hasOverloads`' is set to `true` to represent "ambiguous match". eg. If '`tthis`' is mutable, and there's two or more mutable methods. 4. If there's no candidates, it's "no match" and returns `null` with error report. e.g. If '`tthis`' is const but there's no const methods.
  final TemplateDeclaration `findTemplateDeclRoot`();
    find function template root in overload list
  final bool `inUnittest`();
    Returns `true` if function was declared directly or indirectly in a unittest block
  final MATCH `leastAsSpecialized`(FuncDeclaration `g`);
    Determine partial specialization order of 'this' vs `g`. This is very similar to TemplateDeclaration::`leastAsSpecialized`().
    Returns:
    match 'this' is at least as specialized as `g` 0 `g` is more specialized than 'this'
  final LabelDsymbol `searchLabel`(Identifier `ident`);
    Labels are in a separate scope, one per function.
  final int `getLevel`(Loc `loc`, Scope* `sc`, FuncDeclaration `fd`);
    Determine lexical level difference from 'this' to nested function '`fd`'. Error if this cannot call `fd`.
    Returns:
    0 same level >0 decrease nesting by number -1 increase nesting by 1 (`fd` is nested within 'this') -2 error
  final const(char)* `toFullSignature`();
    for diagnostics, e.g. 'int foo(int x, int y) pure'
  final bool `isAbstract`();
    Override so it can work even if semantic() hasn't yet been run.
  final bool `canInferAttributes`(Scope* `sc`);
    Decide if attributes for this function can be inferred from examining the function body.
    Returns:
    `true` if can
  final void `initInferAttributes`();
    Initialize for inferring the attributes of this function.
  final bool `setImpure`();
    The function is doing something impure, so mark it as impure. If there's a purity error, return `true`.
  final bool `setUnsafe`();
    The function is doing something unsave, so mark it as unsafe. If there's a safe error, return `true`.
  final bool `setGC`();
    The function is doing something that may allocate with the GC, so mark it as not nogc (not no-how).
    Returns:
    `true` if function is marked as @nogc, meaning a user error occurred
  final bool `isReturnIsolated`();
    See if pointers from function parameters, mutable globals, or uplevel functions could leak into return value.
    Returns:
    `true` if the function return value is isolated from any inputs to the function
  final bool `isTypeIsolated`(Type `t`);
    See if pointers from function parameters, mutable globals, or uplevel functions could leak into type `t`.
    Parameters:

    Type `t` | type to check if it is isolated

    Returns:
    `true` if `t` is isolated from any inputs to the function
  bool `isNested`();
    Determine if function needs a static frame pointer.
    Returns:
    true if function is really nested within other function.

    Contracts: If `isNested`() returns `true`, isThis() should return `false`.

  AggregateDeclaration `isThis`();
    Determine if function is a non-static member function that has an implicit 'this' expression.
    Returns:
    The aggregate it is a member of, or `null`.

    Contracts: If `isThis`() returns `true`, isNested() should return `false`.

  final FuncDeclaration `isUnique`();
    If there are no overloads of function f, return that function, otherwise return NULL.
  final bool `checkNestedReference`(Scope* `sc`, Loc `loc`);
    In the current function, we are calling 'this' function. 1. Check to see if the current function can call 'this' function, issue error if not. 2. If the current function is not the parent of 'this' function, then add the current function to the list of siblings of 'this' function. 3. If the current function is a literal, and it's accessing an uplevel scope, then mark it as a delegate. Returns `true` if error occurs.
  final bool `needsClosure`();
    Look at all the variables in this function that are referenced by nested functions, and determine if a closure needs to be created for them.
  final bool `checkClosure`();
    Check that the function contains any closure. If it's @nogc, report suitable errors. This is mostly consistent with FuncDeclaration::needsClosure().
    Returns:
    `true` if any errors occur.
  final bool `hasNestedFrameRefs`();
    Determine if function's variables are referenced by a function nested within it.
  final void `buildResultVar`(Scope* `sc`, Type `tret`);
    Declare result variable lazily.
  final Statement `mergeFrequire`(Statement `sf`);
    Merge into this function the 'in' contracts of all it overrides. 'in's are OR'd together, i.e. only one of them needs to pass.
  static bool `needsFensure`(FuncDeclaration `fd`);
    Determine whether an 'out' contract is declared inside the given function or any of its overrides.
    Parameters:

    FuncDeclaration `fd` | the function to search

    Returns:
    `true` found an 'out' contract
  final void `buildEnsureRequire`();
    Rewrite contracts as nested functions, then call them. Doing it as nested functions means that overriding functions can call them.
  final Statement `mergeFensure`(Statement `sf`, Identifier `oid`);
    Merge into this function the 'out' contracts of all it overrides. 'out's are AND'd together, i.e. all of them need to pass.
  final Parameters* `getParameters`(int* `pvarargs`);
    Return the function's parameter list, and whether it is variadic or not.
  static FuncDeclaration `genCfunc`(Parameters* `fparams`, Type `treturn`, const(char)* `name`, StorageClass `stc` = 0);
    Generate a FuncDeclaration for a runtime library function.
  final void `checkDmain`();
    Check parameters and return type of D main() function. Issue error messages.
Expression `addInvariant`(Loc `loc`, Scope* `sc`, AggregateDeclaration `ad`, VarDeclaration `vthis`);
  Generate Expression to call the invariant.

  Input: `ad` aggregate with the invariant `vthis` variable with 'this'

  Returns:
  void expression that calls the invariant
int `overloadApply`(Dsymbol `fstart`, scope int delegate(Dsymbol) `dg`);
  Visit each overloaded function/template in turn, and call `dg`(s) on it. Exit when no more, or `dg`(s) returns nonzero.
  Returns:
  ==0 continue !=0 done
FuncDeclaration `resolveFuncCall`(Loc `loc`, Scope* `sc`, Dsymbol `s`, Objects* `tiargs`, Type `tthis`, Expressions* `fargs`, int `flags` = 0);
  Given a symbol that could be either a FuncDeclaration or a function template, resolve it to a function symbol.
  Parameters:

  Loc `loc` | instantiation location
  Scope* `sc` | instantiation scope
  Objects* `tiargs` | initial list of template arguments
  Type `tthis` | if !NULL, the this argument type
  Expressions* `fargs` | arguments to function
  int `flags` | 1: do not issue error message on no match, just return NULL 2: overloadResolve only

  Returns:
  if match is found, then function symbol, else `null`
Type `getIndirection`(Type `t`);
  Returns an indirect type one step from `t`.
class `FuncAliasDeclaration`: dmd.func.FuncDeclaration;
  Used as a way to import a set of functions from another scope into this one.
class `FuncLiteralDeclaration`: dmd.func.FuncDeclaration;
  void `modifyReturns`(Scope* `sc`, Type `tret`);
    Modify all expression type of return statements to `tret`.
    On function literals, return type may be modified based on the context type after its semantic3 is done, in FuncExp::implicitCastTo.
    A function() dg = (){ return new B(); } // OK if is(B : A) == `true`
    If B to A conversion is convariant that requires offseet adjusting, all return statements should be adjusted to return expressions typed A.
class `CtorDeclaration`: dmd.func.FuncDeclaration;
class `PostBlitDeclaration`: dmd.func.FuncDeclaration;
class `DtorDeclaration`: dmd.func.FuncDeclaration;
class `StaticCtorDeclaration`: dmd.func.FuncDeclaration;
class `SharedStaticCtorDeclaration`: dmd.func.StaticCtorDeclaration;
class `StaticDtorDeclaration`: dmd.func.FuncDeclaration;
class `SharedStaticDtorDeclaration`: dmd.func.StaticDtorDeclaration;
class `InvariantDeclaration`: dmd.func.FuncDeclaration;
class `UnitTestDeclaration`: dmd.func.FuncDeclaration;
  final void `setIdentifier`();
    Sets the "real" identifier, replacing the one created in the contructor. The reason for this is that the "real" identifier can only be generated properly in the semantic pass. See:

    https: //issues.dlang.org/show_bug.cgi?id=16995

class `NewDeclaration`: dmd.func.FuncDeclaration;
class `DeleteDeclaration`: dmd.func.FuncDeclaration;

Copyright © 1999-2018 by the D Language Foundation | Page generated by Ddoc on Tue Jan 2 20:54:47 2018