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/*****************************************************************************/
/* */
/* exprdesc.h */
/* */
/* Expression descriptor structure */
/* */
/* */
/* */
/* (C) 2002-2010, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#ifndef EXPRDESC_H
#define EXPRDESC_H
#include <inttypes.h>
#include <string.h>
/* common */
#include "fp.h"
#include "inline.h"
/* cc65 */
#include "asmcode.h"
#include "datatype.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Defines for the flags field of the expression descriptor */
enum {
/* Location: Where is the value we're talking about?
**
** Remarks:
** - E_LOC_<else> refers to any other than E_LOC_NONE and E_LOC_PRIMARY.
** - E_LOC_EXPR can be regarded as a generalized E_LOC_<else>.
** - E_LOC_NONE can be regarded as E_LOC_PRIMARY + E_ADDRESS_OF unless
** remarked otherwise (see below).
** - An E_LOC_NONE value is not considered to be an "address".
** - ref-load doesn't change the location, while rval-load puts into the
** primary register a "temporary" that is the straight integer rvalue or
** a "delegate" to the real rvalue somewhere else.
** - ref-load doesn't change the rval/lval category of the expression,
** while rval-load converts it to an rvalue if it wasn't.
** - In practice, ref-load is unimplemented, and can be simulated with
** adding E_ADDRESS_OF temporaily through LoadExpr + FinalizeLoad,
** whilst val-load is done with LoadExpr + FinalizeRValLoad.
**
** E_LOC_NONE -- ref-load -> + E_LOADED (int rvalue)
** E_LOC_PRIMARY -- ref-load -> + E_LOADED (unchanged)
** E_LOC_<else> -- ref-load -> + E_LOADED (reference lvalue)
** + E_ADDRESS_OF -- ref-load -> + E_LOADED (address rvalue)
** E_LOC_NONE -- val-load -> E_LOC_PRIMARY (int rvalue)
** E_LOC_PRIMARY -- val-load -> E_LOC_PRIMARY (unchanged)
** E_LOC_<else> -- val-load -> E_LOC_PRIMARY (rvalue/delegate)
** + E_ADDRESS_OF -- val-load -> E_LOC_PRIMARY (address rvalue)
** E_LOC_NONE -- take address -> (error)
** E_LOC_PRIMARY -- take address -> + E_ADDRESS_OF (or error)
** E_LOC_EXPR -- take address -> E_LOC_PRIMARY (address)
** E_LOC_<else> -- take address -> + E_ADDRESS_OF (address)
** + E_ADDRESS_OF -- take address -> (error)
** E_LOC_NONE -- dereference -> E_LOC_ABS (lvalue reference)
** E_LOC_PRIMARY -- dereference -> E_LOC_EXPR (lvalue reference)
** E_LOC_<else> -- dereference -> E_LOC_EXPR (pointed-to-value, must load)
** + E_ADDRESS_OF -- dereference -> (lvalue reference)
*/
E_MASK_LOC = 0x01FF,
E_LOC_NONE = 0x0000, /* Pure rvalue with no storage */
E_LOC_ABS = 0x0001, /* Absolute numeric addressed variable */
E_LOC_GLOBAL = 0x0002, /* Global variable */
E_LOC_STATIC = 0x0004, /* Static variable */
E_LOC_REGISTER = 0x0008, /* Register variable */
E_LOC_STACK = 0x0010, /* Value on the stack */
E_LOC_PRIMARY = 0x0020, /* Temporary in primary register */
E_LOC_EXPR = 0x0040, /* A location that the primary register points to */
E_LOC_LITERAL = 0x0080, /* Literal in the literal pool */
E_LOC_CODE = 0x0100, /* C code label location (&&Label) */
/* Immutable location addresses (immutable bases and offsets) */
E_LOC_CONST = E_LOC_NONE | E_LOC_ABS | E_LOC_GLOBAL | E_LOC_STATIC |
E_LOC_REGISTER | E_LOC_LITERAL | E_LOC_CODE,
/* Not-so-immutable location addresses (stack offsets may change dynamically) */
E_LOC_QUASICONST = E_LOC_CONST | E_LOC_STACK,
/* Expression type modifiers */
E_ADDRESS_OF = 0x0400, /* Expression is the address of the lvalue */
/* lvalue/rvalue in C language's sense */
E_MASK_RTYPE = 0x0800,
E_RTYPE_RVAL = 0x0000,
E_RTYPE_LVAL = 0x0800,
/* Expression status */
E_LOADED = 0x1000, /* Expression is loaded in primary */
E_CC_SET = 0x2000, /* Condition codes are set */
E_HAVE_MARKS = 0x4000, /* Code marks are valid */
E_SIDE_EFFECTS = 0x8000, /* Expression has had side effects */
/* Optimization hints */
E_MASK_NEED = 0x030000,
E_NEED_EAX = 0x000000, /* Expression result needs to be loaded in Primary */
E_NEED_NONE = 0x010000, /* Expression result is unused */
E_NEED_TEST = 0x020000, /* Expression needs a test to set cc */
/* Expression evaluation requirements.
** Usage: (Flags & E_EVAL_<Flag>) == E_EVAL_<Flag>
**
** Remark:
** - Expression result, that is the "final value" of the expression, is no
** more than one of the effects of the whole expression. Effects other
** than it are usually consided "side-effects" in this regard.
** - The compiler front end cannot know things determined by the linker,
** such as the actual address of an object with static storage. What it
** can know is categorized as "compiler-known" here.
** - The concept "immutable" here means that once something is determined
** (not necessarily by the compiler), it will never change. This is not
** the same meaning as the "constant" word in the C standard.
** - The concept "compile-time" ( not to be confued with "compiler-known"),
** or "static" (compared to "run-time" as in "_Static_assert" in C, not
** to be confused with the "static" storage) here means that something
** has no run-time behaviors, enforced by the fact that it generates no
** target code (hence "no-code"). It is closely related to the concepts
** above but not the same.
** - An "unevaluated" expression is special and different from the above:
** while it generates no code, cannot change its "value" (it actually has
** no value), and must be completely handled by the compiler front-end,
** it is unique in that it is not "evaluated" while the others are, and
** the codegen routine of such an expression is usually separated from
** the normally evaluated ones. Therefore it is treated differently from
** the above and uses a separate flag that implies none of the above.
** - The "maybe-unused" flag is to suppress the checking and warning on
** expressions with no effects. It doesn't have any special meanings
** beyond that, and is independent from the E_NEED_<flag>s. All
** "unevaluated" expressions are flagged as "maybe-unused" just to
** avoid unnecessary warnings.
**
** Relationship of some concepts:
** - "no-code" implies "no-side-effects"
** - "immutable" = "compiler-known" OR "no-code"
** - "constant expression" in C = "compiler-known" AND "no-code", with minor differences
*/
E_MASK_EVAL = 0xFC0000,
E_EVAL_NONE = 0x000000, /* No requirements */
E_EVAL_IMMUTABLE_RESULT = 0x040000, /* Expression result must be immutable */
E_EVAL_COMPILER_KNOWN = 0x0C0000, /* Expression result must be known to the compiler */
E_EVAL_NO_SIDE_EFFECTS = 0x100000, /* Evaluation must have no side effects */
E_EVAL_NO_CODE = 0x340000, /* Evaluation must generate no code */
E_EVAL_MAYBE_UNUSED = 0x400000, /* Expression result may be unused */
E_EVAL_UNEVAL = 0xC00000, /* Expression is unevaluated */
/* Expression result must be known to the compiler and generate no code to load */
E_EVAL_C_CONST = E_EVAL_COMPILER_KNOWN | E_EVAL_NO_CODE,
/* Flags to combine from subexpressions */
E_MASK_VIRAL = E_SIDE_EFFECTS,
/* Flags to keep in subexpressions of most operations other than ternary */
E_MASK_KEEP_SUBEXPR = E_MASK_EVAL,
/* Flags to keep for the two result subexpressions of the ternary operation */
E_MASK_KEEP_RESULT = E_MASK_NEED | E_MASK_EVAL,
/* Flags to keep when using the ED_Make functions */
E_MASK_KEEP_MAKE = E_HAVE_MARKS | E_MASK_KEEP_RESULT,
};
/* Forward */
struct Literal;
/* Describe the result of an expression */
typedef struct ExprDesc ExprDesc;
struct ExprDesc {
const Type* Type; /* C type of the expression */
unsigned Flags; /* Properties of the expression */
uintptr_t Name; /* Name pointer or label number */
struct SymEntry* Sym; /* Symbol table entry if any */
long IVal; /* Integer value if expression constant */
union {
Double FVal; /* Floating point value */
struct Literal* LVal; /* Literal value */
} V;
/* Start and end of generated code */
CodeMark Start;
CodeMark End;
};
/*****************************************************************************/
/* Code */
/*****************************************************************************/
ExprDesc* ED_Init (ExprDesc* Expr);
/* Initialize an ExprDesc */
#if defined(HAVE_INLINE)
INLINE int ED_GetLoc (const ExprDesc* Expr)
/* Return the location flags from the expression */
{
return (Expr->Flags & E_MASK_LOC);
}
#else
# define ED_GetLoc(Expr) ((Expr)->Flags & E_MASK_LOC)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocNone (const ExprDesc* Expr)
/* Return true if the expression is an absolute value */
{
return (Expr->Flags & E_MASK_LOC) == E_LOC_NONE;
}
#else
# define ED_IsLocNone(Expr) (((Expr)->Flags & E_MASK_LOC) == E_LOC_NONE)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocAbs (const ExprDesc* Expr)
/* Return true if the expression is referenced with an absolute address */
{
return (Expr->Flags & E_MASK_LOC) == E_LOC_ABS;
}
#else
# define ED_IsLocAbs(Expr) (((Expr)->Flags & E_MASK_LOC) == E_LOC_ABS)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocRegister (const ExprDesc* Expr)
/* Return true if the expression is located in a register */
{
return (Expr->Flags & E_MASK_LOC) == E_LOC_REGISTER;
}
#else
# define ED_IsLocRegister(Expr) (((Expr)->Flags & E_MASK_LOC) == E_LOC_REGISTER)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocStack (const ExprDesc* Expr)
/* Return true if the expression is located on the stack */
{
return (Expr->Flags & E_MASK_LOC) == E_LOC_STACK;
}
#else
# define ED_IsLocStack(Expr) (((Expr)->Flags & E_MASK_LOC) == E_LOC_STACK)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocPrimary (const ExprDesc* Expr)
/* Return true if the expression is an expression in the register pseudo variable */
{
return (Expr->Flags & E_MASK_LOC) == E_LOC_PRIMARY;
}
#else
# define ED_IsLocPrimary(Expr) (((Expr)->Flags & E_MASK_LOC) == E_LOC_PRIMARY)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocExpr (const ExprDesc* Expr)
/* Return true if the expression is an expression in the primary */
{
return (Expr->Flags & E_MASK_LOC) == E_LOC_EXPR;
}
#else
# define ED_IsLocExpr(Expr) (((Expr)->Flags & E_MASK_LOC) == E_LOC_EXPR)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocLiteral (const ExprDesc* Expr)
/* Return true if the expression is a string from the literal pool */
{
return (Expr->Flags & E_MASK_LOC) == E_LOC_LITERAL;
}
#else
# define ED_IsLocLiteral(Expr) (((Expr)->Flags & E_MASK_LOC) == E_LOC_LITERAL)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocConst (const ExprDesc* Expr)
/* Return true if the expression is a constant location of some sort */
{
return ((Expr)->Flags & E_MASK_LOC & ~E_LOC_CONST) == 0;
}
#else
# define ED_IsLocConst(Expr) (((Expr)->Flags & E_MASK_LOC & ~E_LOC_CONST) == 0)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocQuasiConst (const ExprDesc* Expr)
/* Return true if the expression is a constant location of some sort or on the
** stack.
*/
{
return ED_IsLocConst (Expr) || ED_IsLocStack (Expr);
}
#else
int ED_IsLocQuasiConst (const ExprDesc* Expr);
/* Return true if the expression denotes a constant address of some sort. This
** can be the address of a global variable (maybe with offset) or similar.
*/
#endif
#if defined(HAVE_INLINE)
INLINE void ED_RequireTest (ExprDesc* Expr)
/* Mark the expression for a test. */
{
Expr->Flags |= E_NEED_TEST;
}
#else
# define ED_RequireTest(Expr) do { (Expr)->Flags |= E_NEED_TEST; } while (0)
#endif
#if defined(HAVE_INLINE)
INLINE void ED_RequireNoTest (ExprDesc* Expr)
/* Mark the expression not for a test. */
{
Expr->Flags &= ~E_NEED_TEST;
}
#else
# define ED_RequireNoTest(Expr) do { (Expr)->Flags &= ~E_NEED_TEST; } while (0)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_GetNeeds (const ExprDesc* Expr)
/* Get flags about what the expression needs. */
{
return (Expr->Flags & E_MASK_NEED);
}
#else
# define ED_GetNeeds(Expr) ((Expr)->Flags & E_MASK_NEED)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_NeedsPrimary (const ExprDesc* Expr)
/* Check if the expression needs to be in Primary. */
{
return (Expr->Flags & E_MASK_NEED) == E_NEED_EAX;
}
#else
# define ED_NeedsPrimary(Expr) (((Expr)->Flags & E_MASK_NEED) == E_NEED_EAX)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_NeedsTest (const ExprDesc* Expr)
/* Check if the expression needs a test. */
{
return (Expr->Flags & E_NEED_TEST) != 0;
}
#else
# define ED_NeedsTest(Expr) (((Expr)->Flags & E_NEED_TEST) != 0)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_YetToTest (const ExprDesc* Expr)
/* Check if the expression needs to be tested but not yet. */
{
return ((Expr)->Flags & (E_NEED_TEST | E_CC_SET)) == E_NEED_TEST;
}
#else
# define ED_YetToTest(Expr) (((Expr)->Flags & (E_NEED_TEST | E_CC_SET)) == E_NEED_TEST)
#endif
#if defined(HAVE_INLINE)
INLINE void ED_TestDone (ExprDesc* Expr)
/* Mark the expression as tested and condition codes set. */
{
Expr->Flags |= E_CC_SET;
}
#else
# define ED_TestDone(Expr) \
do { (Expr)->Flags |= E_CC_SET; } while (0)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsTested (const ExprDesc* Expr)
/* Check if the expression has set the condition codes. */
{
return (Expr->Flags & E_CC_SET) != 0;
}
#else
# define ED_IsTested(Expr) (((Expr)->Flags & E_CC_SET) != 0)
#endif
#if defined(HAVE_INLINE)
INLINE void ED_MarkAsUntested (ExprDesc* Expr)
/* Mark the expression as not tested (condition codes not set). */
{
Expr->Flags &= ~E_CC_SET;
}
#else
# define ED_MarkAsUntested(Expr) do { (Expr)->Flags &= ~E_CC_SET; } while (0)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLoaded (const ExprDesc* Expr)
/* Check if the expression is loaded.
** NOTE: This is currently unused and not working due to code complexity.
*/
{
return (Expr->Flags & E_LOADED) != 0;
}
#else
# define ED_IsLoaded(Expr) (((Expr)->Flags & E_LOADED) != 0)
#endif
int ED_YetToLoad (const ExprDesc* Expr);
/* Check if the expression is yet to be loaded somehow. */
#if defined(HAVE_INLINE)
INLINE int ED_NeedsConst (const ExprDesc* Expr)
/* Check if the expression need be immutable */
{
return (Expr->Flags & E_EVAL_IMMUTABLE_RESULT) == E_EVAL_IMMUTABLE_RESULT;
}
#else
# define ED_NeedsConst(Expr) (((Expr)->Flags & E_EVAL_IMMUTABLE_RESULT) == E_EVAL_IMMUTABLE_RESULT)
#endif
void ED_MarkForUneval (ExprDesc* Expr);
/* Mark the expression as not to be evaluated */
#if defined(HAVE_INLINE)
INLINE int ED_IsUneval (const ExprDesc* Expr)
/* Check if the expression is not to be evaluated */
{
return (Expr->Flags & E_EVAL_UNEVAL) == E_EVAL_UNEVAL;
}
#else
# define ED_IsUneval(Expr) (((Expr)->Flags & E_EVAL_UNEVAL) == E_EVAL_UNEVAL)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_MayHaveNoEffect (const ExprDesc* Expr)
/* Check if the expression may be present without effects */
{
return (Expr->Flags & E_EVAL_MAYBE_UNUSED) == E_EVAL_MAYBE_UNUSED;
}
#else
# define ED_MayHaveNoEffect(Expr) (((Expr)->Flags & E_EVAL_MAYBE_UNUSED) == E_EVAL_MAYBE_UNUSED)
#endif
#if defined(HAVE_INLINE)
INLINE void ED_PropagateFrom (ExprDesc* Expr, const ExprDesc* SubExpr)
/* Propagate viral flags from subexpression */
{
Expr->Flags |= SubExpr->Flags & E_MASK_VIRAL;
}
#else
# define ED_PropagateFrom(Expr, SubExpr) (void)((Expr)->Flags |= (SubExpr)->Flags & E_MASK_VIRAL)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsLocPrimaryOrExpr (const ExprDesc* Expr)
/* Return true if the expression is E_LOC_PRIMARY or E_LOC_EXPR */
{
return ED_IsLocPrimary (Expr) || ED_IsLocExpr (Expr);
}
#else
int ED_IsLocPrimaryOrExpr (const ExprDesc* Expr);
/* Return true if the expression is E_LOC_PRIMARY or E_LOC_EXPR */
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsAddrExpr (const ExprDesc* Expr)
/* Check if the expression is taken address of instead of its value.
*/
{
return (Expr->Flags & E_ADDRESS_OF) != 0;
}
#else
# define ED_IsAddrExpr(Expr) (((Expr)->Flags & E_ADDRESS_OF) != 0)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsIndExpr (const ExprDesc* Expr)
/* Check if the expression is a reference to its value */
{
return (Expr->Flags & E_ADDRESS_OF) == 0 &&
!ED_IsLocNone (Expr) && !ED_IsLocPrimary (Expr);
}
#else
int ED_IsIndExpr (const ExprDesc* Expr);
/* Check if the expression is a reference to its value */
#endif
void ED_SetCodeRange (ExprDesc* Expr, const CodeMark* Start, const CodeMark* End);
/* Set the code range for this expression */
int ED_CodeRangeIsEmpty (const ExprDesc* Expr);
/* Return true if no code was output for this expression */
const char* ED_GetLabelName (const ExprDesc* Expr, long Offs);
/* Return the assembler label name of the given expression. Beware: This
** function may use a static buffer, so the name may get "lost" on the second
** call to the function.
*/
int ED_GetStackOffs (const ExprDesc* Expr, int Offs);
/* Get the stack offset of an address on the stack in Expr taking into account
** an additional offset in Offs.
*/
ExprDesc* ED_MakeConstAbs (ExprDesc* Expr, long Value, const Type* Type);
/* Replace Expr with an absolute const with the given value and type */
ExprDesc* ED_MakeConstAbsInt (ExprDesc* Expr, long Value);
/* Replace Expr with an constant integer with the given value */
ExprDesc* ED_MakeConstBool (ExprDesc* Expr, long Value);
/* Replace Expr with a constant boolean expression with the given value */
ExprDesc* ED_FinalizeRValLoad (ExprDesc* Expr);
/* Finalize the result of LoadExpr to be an rvalue in the primary register */
#if defined(HAVE_INLINE)
INLINE int ED_IsLVal (const ExprDesc* Expr)
/* Return true if the expression is a reference */
{
return ((Expr)->Flags & E_MASK_RTYPE) == E_RTYPE_LVAL;
}
#else
# define ED_IsLVal(Expr) (((Expr)->Flags & E_MASK_RTYPE) == E_RTYPE_LVAL)
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsRVal (const ExprDesc* Expr)
/* Return true if the expression is an rvalue */
{
return ((Expr)->Flags & E_MASK_RTYPE) == E_RTYPE_RVAL;
}
#else
# define ED_IsRVal(Expr) (((Expr)->Flags & E_MASK_RTYPE) == E_RTYPE_RVAL)
#endif
#if defined(HAVE_INLINE)
INLINE void ED_MarkExprAsLVal (ExprDesc* Expr)
/* Mark the expression as an lvalue.
** HINT: Consider using ED_IndExpr instead of this, unless you know what
** consequence there will be, as there are both a big part in the code
** assuming rvalue = const and a big part assuming rvalue = address.
*/
{
Expr->Flags |= E_RTYPE_LVAL;
}
#else
# define ED_MarkExprAsLVal(Expr) do { (Expr)->Flags |= E_RTYPE_LVAL; } while (0)
#endif
#if defined(HAVE_INLINE)
INLINE void ED_MarkExprAsRVal (ExprDesc* Expr)
/* Mark the expression as an rvalue.
** HINT: Consider using ED_AddrExpr instead of this, unless you know what
** consequence there will be, as there are both a big part in the code
** assuming rvalue = const and a big part assuming rvalue = address.
*/
{
Expr->Flags &= ~E_RTYPE_LVAL;
}
#else
# define ED_MarkExprAsRVal(Expr) do { (Expr)->Flags &= ~E_RTYPE_LVAL; } while (0)
#endif
ExprDesc* ED_AddrExpr (ExprDesc* Expr);
/* Take address of Expr */
ExprDesc* ED_IndExpr (ExprDesc* Expr);
/* Dereference Expr */
#if defined(HAVE_INLINE)
INLINE int ED_IsAbs (const ExprDesc* Expr)
/* Return true if the expression denotes a numeric value or address. */
{
return (Expr->Flags & (E_MASK_LOC)) == (E_LOC_NONE) ||
(Expr->Flags & (E_MASK_LOC|E_ADDRESS_OF)) == (E_LOC_ABS|E_ADDRESS_OF);
}
#else
int ED_IsAbs (const ExprDesc* Expr);
/* Return true if the expression denotes a numeric value or address. */
#endif
#if defined(HAVE_INLINE)
INLINE int ED_IsConstAbs (const ExprDesc* Expr)
/* Return true if the expression denotes a constant absolute value. This can be
** a numeric constant, cast to any type.
*/
{
return ED_IsRVal (Expr) && ED_IsAbs (Expr);
}
#else
int ED_IsConstAbs (const ExprDesc* Expr);
/* Return true if the expression denotes a constant absolute value. This can be
** a numeric constant, cast to any type.
*/
#endif
int ED_IsConstAbsInt (const ExprDesc* Expr);
/* Return true if the expression is a constant (numeric) integer. */
int ED_IsConstBool (const ExprDesc* Expr);
/* Return true if the expression can be constantly evaluated as a boolean. */
int ED_IsConstTrue (const ExprDesc* Expr);
/* Return true if the constant expression can be evaluated as boolean true at
** compile time.
*/
int ED_IsConstFalse (const ExprDesc* Expr);
/* Return true if the constant expression can be evaluated as boolean false at
** compile time.
*/
int ED_IsConst (const ExprDesc* Expr);
/* Return true if the expression denotes a constant of some sort. This can be a
** numeric constant, the address of a global variable (maybe with offset) or
** similar.
*/
int ED_IsQuasiConst (const ExprDesc* Expr);
/* Return true if the expression denotes a quasi-constant of some sort. This
** can be a numeric constant, a constant address or a stack variable address.
*/
int ED_IsConstAddr (const ExprDesc* Expr);
/* Return true if the expression denotes a constant address of some sort. This
** can be the address of a global variable (maybe with offset) or similar.
*/
int ED_IsQuasiConstAddr (const ExprDesc* Expr);
/* Return true if the expression denotes a quasi-constant address of some sort.
** This can be a constant address or a stack variable address.
*/
int ED_IsNullPtr (const ExprDesc* Expr);
/* Return true if the given expression is a NULL pointer constant */
int ED_IsBool (const ExprDesc* Expr);
/* Return true if the expression can be treated as a boolean, that is, it can
** be an operand to a compare operation with 0/NULL.
*/
void PrintExprDesc (FILE* F, ExprDesc* Expr);
/* Print an ExprDesc */
const Type* ReplaceType (ExprDesc* Expr, const Type* NewType);
/* Replace the type of Expr by a copy of Newtype and return the old type string */
/* End of exprdesc.h */
#endif
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