--- /dev/null
+/*****************************************************************************/
+/* */
+/* loadexpr.c */
+/* */
+/* Load an expression into the primary register */
+/* */
+/* */
+/* */
+/* (C) 2004 Ullrich von Bassewitz */
+/* Römerstraße 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. */
+/* */
+/*****************************************************************************/
+
+
+
+/* cc65 */
+#include "codegen.h"
+#include "error.h"
+#include "exprdesc.h"
+#include "global.h"
+#include "loadexpr.h"
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+static void LoadConstant (unsigned Flags, ExprDesc* Expr)
+/* Load the primary register with some constant value. */
+{
+ switch (ED_GetLoc (Expr)) {
+
+ case E_LOC_ABS:
+ /* Number constant */
+ g_getimmed (Flags | TypeOf (Expr->Type) | CF_CONST, Expr->IVal, 0);
+ break;
+
+ case E_LOC_GLOBAL:
+ /* Global symbol, load address */
+ g_getimmed ((Flags | CF_EXTERNAL) & ~CF_CONST, Expr->Name, Expr->IVal);
+ break;
+
+ case E_LOC_STATIC:
+ case E_LOC_LITERAL:
+ /* Static symbol or literal, load address */
+ g_getimmed ((Flags | CF_STATIC) & ~CF_CONST, Expr->Name, Expr->IVal);
+ break;
+
+ case E_LOC_REGISTER:
+ /* Register variable. Taking the address is usually not
+ * allowed.
+ */
+ if (IS_Get (&AllowRegVarAddr) == 0) {
+ Error ("Cannot take the address of a register variable");
+ }
+ g_getimmed ((Flags | CF_REGVAR) & ~CF_CONST, Expr->Name, Expr->IVal);
+
+ case E_LOC_STACK:
+ g_leasp (Expr->IVal);
+ break;
+
+ default:
+ Internal ("Unknown constant type: %04X", Expr->Flags);
+ }
+}
+
+
+
+void LoadExpr (unsigned Flags, struct ExprDesc* Expr)
+/* Load an expression into the primary register if it is not already there. */
+{
+ if (ED_IsLVal (Expr)) {
+
+ /* Dereferenced lvalue */
+ Flags |= TypeOf (Expr->Type);
+ if (ED_NeedsTest (Expr)) {
+ Flags |= CF_TEST;
+ }
+
+ switch (ED_GetLoc (Expr)) {
+
+ case E_LOC_ABS:
+ /* Absolute: numeric address or const */
+ g_getstatic (Flags | CF_ABSOLUTE, Expr->IVal, 0);
+ break;
+
+ case E_LOC_GLOBAL:
+ /* Global variable */
+ g_getstatic (Flags | CF_EXTERNAL, Expr->Name, Expr->IVal);
+ break;
+
+ case E_LOC_STATIC:
+ case E_LOC_LITERAL:
+ /* Static variable or literal in the literal pool */
+ g_getstatic (Flags | CF_STATIC, Expr->Name, Expr->IVal);
+ break;
+
+ case E_LOC_REGISTER:
+ /* Register variable */
+ g_getstatic (Flags | CF_REGVAR, Expr->Name, Expr->IVal);
+ break;
+
+ case E_LOC_STACK:
+ /* Value on the stack */
+ g_getlocal (Flags, Expr->IVal);
+ break;
+
+ case E_LOC_PRIMARY:
+ /* The primary register - just test if necessary */
+ if (Flags & CF_TEST) {
+ g_test (Flags);
+ }
+ break;
+
+ case E_LOC_EXPR:
+ /* Reference to address in primary with offset in Expr */
+ g_getind (Flags, Expr->IVal);
+ break;
+
+ default:
+ Internal ("Invalid location in LoadExpr: 0x%04X", ED_GetLoc (Expr));
+ }
+
+ /* Expression was tested */
+ ED_TestDone (Expr);
+
+ } else {
+ /* An rvalue */
+ if (ED_IsLocExpr (Expr)) {
+ if (Expr->IVal != 0) {
+ /* We have an expression in the primary plus a constant
+ * offset. Adjust the value in the primary accordingly.
+ */
+ Flags |= TypeOf (Expr->Type);
+ g_inc (Flags | CF_CONST, Expr->IVal);
+ }
+ } else {
+ /* Constant of some sort, load it into the primary */
+ LoadConstant (Flags, Expr);
+ }
+
+ /* Are we testing this value? */
+ if (ED_NeedsTest (Expr)) {
+ /* Yes, force a test */
+ Flags |= TypeOf (Expr->Type);
+ g_test (Flags);
+ ED_TestDone (Expr);
+ }
+ }
+}
+
+
+
--- /dev/null
+/*****************************************************************************/
+/* */
+/* loadexpr.h */
+/* */
+/* Load an expression into the primary register */
+/* */
+/* */
+/* */
+/* (C) 2004 Ullrich von Bassewitz */
+/* Römerstraße 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 LOADEXPR_H
+#define LOADEXPR_H
+
+
+
+/*****************************************************************************/
+/* Forwards */
+/*****************************************************************************/
+
+
+
+struct ExprDesc;
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+void LoadExpr (unsigned Flags, struct ExprDesc* Expr);
+/* Load an expression into the primary register if it is not already there. */
+
+
+
+/* End of loadexpr.h */
+#endif
+
+
+
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