1 /*****************************************************************************/
5 /* Function management */
9 /* (C) 1998-2012, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
41 /*****************************************************************************/
43 /*****************************************************************************/
46 /* Enumeration for function flags */
49 FF_HAS_RETURN = 0x0001, /* Function has a return statement */
50 FF_IS_MAIN = 0x0002, /* This is the main function */
51 FF_VOID_RETURN = 0x0004, /* Function returning void */
54 /* Structure that holds all data needed for function activation */
56 struct SymEntry* FuncEntry; /* Symbol table entry */
57 Type* ReturnType; /* Function return type */
58 FuncDesc* Desc; /* Function descriptor */
59 int Reserved; /* Reserved local space */
60 unsigned RetLab; /* Return code label */
61 int TopLevelSP; /* SP at function top level */
62 unsigned RegOffs; /* Register variable space offset */
63 funcflags_t Flags; /* Function flags */
64 Collection LocalsBlockStack; /* Stack of blocks with local vars */
67 /* Structure that holds all data needed for function activation */
68 typedef struct Function Function;
70 /* Function activation data for current function (or NULL) */
71 extern Function* CurrentFunc;
75 /*****************************************************************************/
77 /*****************************************************************************/
81 const char* F_GetFuncName (const Function* F);
82 /* Return the name of the current function */
84 unsigned F_GetParamCount (const Function* F);
85 /* Return the parameter count for the current function */
87 unsigned F_GetParamSize (const Function* F);
88 /* Return the parameter size for the current function */
90 Type* F_GetReturnType (Function* F);
91 /* Get the return type for the function */
93 int F_HasVoidReturn (const Function* F);
94 /* Return true if the function does not have a return value */
96 void F_ReturnFound (Function* F);
97 /* Mark the function as having a return statement */
99 int F_HasReturn (const Function* F);
100 /* Return true if the function contains a return statement*/
102 int F_IsMainFunc (const Function* F);
103 /* Return true if this is the main function */
105 int F_IsVariadic (const Function* F);
106 /* Return true if this is a variadic function */
108 int F_IsOldStyle (const Function* F);
109 /* Return true if this is an old style (K&R) function */
111 int F_HasOldStyleIntRet (const Function* F);
112 /* Return true if this is an old style (K&R) function with an implicit int return */
114 unsigned F_GetRetLab (const Function* F);
115 /* Return the return jump label */
117 int F_GetTopLevelSP (const Function* F);
118 /* Get the value of the stack pointer on function top level */
120 int F_ReserveLocalSpace (Function* F, unsigned Size);
121 /* Reserve (but don't allocate) the given local space and return the stack
125 int F_GetStackPtr (const Function* F);
126 /* Return the current stack pointer including reserved (but not allocated)
127 ** space on the stack.
130 void F_AllocLocalSpace (Function* F);
131 /* Allocate any local space previously reserved. The function will do
132 ** nothing if there is no reserved local space.
135 int F_AllocRegVar (Function* F, const Type* Type);
136 /* Allocate a register variable for the given variable type. If the allocation
137 ** was successful, return the offset of the register variable in the register
138 ** bank (zero page storage). If there is no register space left, return -1.
141 void NewFunc (struct SymEntry* Func);
142 /* Parse argument declarations and function body. */
146 /* End of function.h */