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Create one literal pool per function, so that literal pool data is removed
together with a function, if it is not used. Literal storage can now be controlled by #pragma writable-strings on a per function basis. git-svn-id: svn://svn.cc65.org/cc65/trunk@4499 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
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@ -244,7 +244,7 @@ Here is a description of all the command line options:
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better way is to declare characters explicitly as "signed" if needed. You
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can also use <tt><ref id="pragma-signed-chars"
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name="#pragma signed-chars"></tt> for better control of this option.
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<label id="option--standard">
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<tag><tt>--standard std</tt></tag>
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@ -300,7 +300,9 @@ Here is a description of all the command line options:
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<tag><tt>--writable-strings</tt></tag>
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Make string literals writable by placing them into the data segment instead
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of the rodata segment.
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of the rodata segment. You can also use <tt><ref id="pragma-writable-strings"
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name="#pragma writable-strings"></tt> to control this option on a
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per function basis.
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<label id="option-static-locals">
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@ -975,6 +977,26 @@ parameter with the <tt/#pragma/.
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#pragma warn (unused-param, pop)
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</verb></tscreen>
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<sect1><tt>#pragma writable-strings ([push,] on|off)</tt><label id="pragma-writable-strings"><p>
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Changes the storage location of string literals. For historical reasons,
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the C standard defines that string literals are of type "char[]", but
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writing to such a literal causes undefined behaviour. Most compilers
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(including cc65) place string literals in the read-only data segment, which
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may cause problems with old C code that writes to string literals.
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Using this pragma (or the corresponding command line option <tt/<ref
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name="--writable-strings" id="option-writable-strings">/) causes the
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literals to be placed in the data segment so they can be written to without
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worry.
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Please note that the value of this flag that is in effect when a function
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is encountered, determines where the literals are stored. Changing the
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<tt/#pragma/ within a function doesn't have an effect for this function.
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The <tt/#pragma/ understands the push and pop parameters as explained above.
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<sect1><tt>#pragma zpsym (<name>)</tt><p>
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Tell the compiler that the -- previously as external declared -- symbol with
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@ -751,7 +751,7 @@ static void Primary (ExprDesc* E)
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E->Type = GetCharArrayType (GetLiteralPoolOffs () - CurTok.IVal);
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E->Flags = E_LOC_LITERAL | E_RTYPE_RVAL;
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E->IVal = CurTok.IVal;
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E->Name = LiteralPoolLabel;
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E->Name = GetLiteralPoolLabel ();
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NextToken ();
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break;
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@ -380,9 +380,9 @@ void NewFunc (SymEntry* Func)
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/* Reenter the lexical level */
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ReenterFunctionLevel (D);
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/* Check if the function header contains unnamed parameters. These are
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/* Check if the function header contains unnamed parameters. These are
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* only allowed in cc65 mode.
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*/
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*/
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if ((D->Flags & FD_UNNAMED_PARAMS) != 0 && (IS_Get (&Standard) != STD_CC65)) {
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Error ("Parameter name omitted");
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}
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@ -439,6 +439,9 @@ void NewFunc (SymEntry* Func)
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/* Allocate code and data segments for this function */
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Func->V.F.Seg = PushSegments (Func);
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/* Allocate a new literal pool */
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PushLiteralPool (Func);
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/* If this is a fastcall function, push the last parameter onto the stack */
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if (IsQualFastcall (Func->Type) && D->ParamCount > 0) {
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@ -539,6 +542,10 @@ void NewFunc (SymEntry* Func)
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/* Eat the closing brace */
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ConsumeRCurly ();
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/* Dump the literal pool, the restore the old one */
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DumpLiteralPool ();
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PopLiteralPool ();
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/* Switch back to the old segments */
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PopSegments ();
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@ -6,10 +6,10 @@
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/* */
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/* */
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/* */
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/* (C) 1998-2004 Ullrich von Bassewitz */
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/* Römerstraße 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* (C) 1998-2009, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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@ -37,7 +37,9 @@
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/* common */
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#include "check.h"
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#include "coll.h"
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#include "tgttrans.h"
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#include "xmalloc.h"
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/* cc65 */
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#include "asmlabel.h"
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@ -54,8 +56,27 @@
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unsigned LiteralPoolLabel = 0; /* Pool asm label */
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static StrBuf LiteralPool = STATIC_STRBUF_INITIALIZER;
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/* Forward for struct SymEntry */
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struct SymEntry;
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/* Definition of the literal pool */
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typedef struct LiteralPool LiteralPool;
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struct LiteralPool {
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int Writable; /* True if strings are writable */
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unsigned Label; /* Pool asm label */
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struct SymEntry* Func; /* Function that contains the pool */
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StrBuf Pool; /* The pool itself */
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};
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/* The current literal pool */
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static LiteralPool* LP = 0;
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/* Stack that contains the nested literal pools. Since TOS is in LiteralPool
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* and functions aren't nested in C, the maximum depth is 1. I'm using a
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* collection anyway, so the code is prepared for nested functions or
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* whatever.
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*/
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static Collection LPStack = STATIC_COLLECTION_INITIALIZER;
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@ -65,11 +86,68 @@ static StrBuf LiteralPool = STATIC_STRBUF_INITIALIZER;
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static LiteralPool* NewLiteralPool (struct SymEntry* Func)
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/* Create a new literal pool and return it */
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{
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/* Allocate memory */
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LiteralPool* LP = xmalloc (sizeof (*LP));
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/* Initialize the fields */
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LP->Writable = IS_Get (&WritableStrings);
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LP->Label = GetLocalLabel ();
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LP->Func = Func;
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SB_Init (&LP->Pool);
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/* Return the new pool */
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return LP;
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}
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static void FreeLiteralPool (LiteralPool* LP)
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/* Free a LiteralPool structure */
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{
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/* Free the string buffer contained within the struct */
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SB_Done (&LP->Pool);
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/* Free the struct itself */
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xfree (LP);
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}
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void InitLiteralPool (void)
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/* Initialize the literal pool */
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{
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/* Get the pool label */
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LiteralPoolLabel = GetLocalLabel ();
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/* Create a new pool */
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LP = NewLiteralPool (0);
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}
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void PushLiteralPool (struct SymEntry* Func)
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/* Push the current literal pool onto the stack and create a new one */
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{
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/* We must have a literal pool to push! */
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PRECONDITION (LP != 0);
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/* Push the old pool */
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CollAppend (&LPStack, LP);
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/* Create a new one */
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LP = NewLiteralPool (Func);
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}
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void PopLiteralPool (void)
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/* Free the current literal pool and restore the one from TOS */
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{
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/* Free the current literal pool */
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FreeLiteralPool (LP);
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/* Pop one from stack */
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LP = CollPop (&LPStack);
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}
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@ -79,7 +157,7 @@ void TranslateLiteralPool (unsigned Offs)
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* charset.
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*/
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{
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TgtTranslateBuf (SB_GetBuf (&LiteralPool) + Offs, SB_GetLen (&LiteralPool) - Offs);
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TgtTranslateBuf (SB_GetBuf (&LP->Pool) + Offs, SB_GetLen (&LP->Pool) - Offs);
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}
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/* Dump the literal pool */
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{
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/* If nothing there, exit... */
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if (SB_GetLen (&LiteralPool) == 0) {
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if (SB_GetLen (&LP->Pool) == 0) {
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return;
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}
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/* Switch to the data segment */
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if (IS_Get (&WritableStrings)) {
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/* Switch to the correct segment */
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if (LP->Writable) {
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g_usedata ();
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} else {
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g_userodata ();
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}
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/* Define the label */
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g_defdatalabel (LiteralPoolLabel);
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g_defdatalabel (LP->Label);
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/* Translate the buffer contents into the target charset */
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TranslateLiteralPool (0);
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/* Output the buffer data */
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g_defbytes (SB_GetConstBuf (&LiteralPool), SB_GetLen (&LiteralPool));
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g_defbytes (SB_GetConstBuf (&LP->Pool), SB_GetLen (&LP->Pool));
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}
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unsigned GetLiteralPoolLabel (void)
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/* Return the asm label for the current literal pool */
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{
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return LP->Label;
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}
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unsigned GetLiteralPoolOffs (void)
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/* Return the current offset into the literal pool */
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{
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return SB_GetLen (&LiteralPool);
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return SB_GetLen (&LP->Pool);
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}
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* removing values from the pool.
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*/
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{
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CHECK (Offs <= SB_GetLen (&LiteralPool));
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SB_Cut (&LiteralPool, Offs);
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}
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void AddLiteralChar (char C)
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/* Add one character to the literal pool */
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{
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SB_AppendChar (&LiteralPool, C);
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CHECK (Offs <= SB_GetLen (&LP->Pool));
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SB_Cut (&LP->Pool, Offs);
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}
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* the pool
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*/
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{
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/* Remember the starting offset */
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unsigned Start = SB_GetLen (&LiteralPool);
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return AddLiteralBuf (S, strlen (S) + 1);
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}
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/* Copy the string including the terminator growing the buffer if needed */
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SB_AppendBuf (&LiteralPool, S, strlen (S) + 1);
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unsigned AddLiteralBuf (const void* Buf, unsigned Len)
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/* Add a buffer containing a literal string to the literal pool. Return the
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* starting offset into the pool for this string.
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*/
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{
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/* Remember the starting offset */
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unsigned Start = SB_GetLen (&LP->Pool);
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/* Append the buffer */
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SB_AppendBuf (&LP->Pool, Buf, Len);
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/* Return the starting offset */
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return Start;
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unsigned AddLiteralStr (const StrBuf* S)
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/* Add a literal string to the literal pool. Return the starting offset into
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* the pool for this string.
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*/
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{
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return AddLiteralBuf (SB_GetConstBuf (S), SB_GetLen (S));
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}
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const char* GetLiteral (unsigned Offs)
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/* Get a pointer to the literal with the given offset in the pool */
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{
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CHECK (Offs < SB_GetLen (&LiteralPool));
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return SB_GetConstBuf (&LiteralPool) + Offs;
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CHECK (Offs < SB_GetLen (&LP->Pool));
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return SB_GetConstBuf (&LP->Pool) + Offs;
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}
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@ -169,8 +267,8 @@ void GetLiteralStrBuf (StrBuf* Target, unsigned Offs)
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* into Target.
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*/
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{
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CHECK (Offs <= SB_GetLen (&LiteralPool));
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SB_Slice (Target, &LiteralPool, Offs, SB_GetLen (&LiteralPool) - Offs);
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CHECK (Offs <= SB_GetLen (&LP->Pool));
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SB_Slice (Target, &LP->Pool, Offs, SB_GetLen (&LP->Pool) - Offs);
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}
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void PrintLiteralPoolStats (FILE* F)
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/* Print statistics about the literal space used */
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{
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fprintf (F, "Literal space used: %u bytes\n", SB_GetLen (&LiteralPool));
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fprintf (F, "Literal space used: %u bytes\n", SB_GetLen (&LP->Pool));
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}
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@ -6,10 +6,10 @@
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/* */
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/* */
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/* */
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/* (C) 1998-2001 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@cc65.org */
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/* (C) 1998-2009, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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@ -51,7 +51,8 @@
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extern unsigned LiteralPoolLabel; /* Pool asm label */
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/* Forward for struct SymEntry */
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struct SymEntry;
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void InitLiteralPool (void);
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/* Initialize the literal pool */
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void PushLiteralPool (struct SymEntry* Func);
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/* Push the current literal pool onto the stack and create a new one */
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void PopLiteralPool (void);
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/* Free the current literal pool and restore the one from TOS */
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void TranslateLiteralPool (unsigned Offs);
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/* Translate the literals starting from the given offset into the target
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* charset.
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@ -72,6 +79,9 @@ void TranslateLiteralPool (unsigned Offs);
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void DumpLiteralPool (void);
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/* Dump the literal pool */
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unsigned GetLiteralPoolLabel (void);
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/* Return the asm label for the current literal pool */
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unsigned GetLiteralPoolOffs (void);
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/* Return the current offset into the literal pool */
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* removing values from the pool.
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*/
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void AddLiteralChar (char C);
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/* Add one character to the literal pool */
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unsigned AddLiteral (const char* S);
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/* Add a literal string to the literal pool. Return the starting offset into
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* the pool for this string.
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*/
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unsigned AddLiteralBuf (const void* Buf, unsigned Len);
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/* Add a buffer containing a literal string to the literal pool. Return the
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* starting offset into the pool for this string.
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*/
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unsigned AddLiteralStr (const StrBuf* S);
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/* Add a literal string to the literal pool. Return the starting offset into
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* the pool for this string.
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*/
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const char* GetLiteral (unsigned Offs);
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/* Get a pointer to the literal with the given offset in the pool */
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@ -84,6 +84,7 @@ typedef enum {
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PRAGMA_STATIC_LOCALS,
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PRAGMA_STATICLOCALS, /* obsolete */
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PRAGMA_WARN,
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PRAGMA_WRITABLE_STRINGS,
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PRAGMA_ZPSYM,
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PRAGMA_COUNT
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} pragma_t;
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@ -93,28 +94,29 @@ static const struct Pragma {
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const char* Key; /* Keyword */
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pragma_t Tok; /* Token */
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} Pragmas[PRAGMA_COUNT] = {
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{ "bss-name", PRAGMA_BSS_NAME },
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{ "bssseg", PRAGMA_BSSSEG }, /* obsolete */
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{ "charmap", PRAGMA_CHARMAP },
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{ "check-stack", PRAGMA_CHECK_STACK },
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{ "checkstack", PRAGMA_CHECKSTACK }, /* obsolete */
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{ "code-name", PRAGMA_CODE_NAME },
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{ "codeseg", PRAGMA_CODESEG }, /* obsolete */
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{ "codesize", PRAGMA_CODESIZE },
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{ "data-name", PRAGMA_DATA_NAME },
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{ "dataseg", PRAGMA_DATASEG }, /* obsolete */
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{ "optimize", PRAGMA_OPTIMIZE },
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{ "register-vars", PRAGMA_REGISTER_VARS },
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{ "regvaraddr", PRAGMA_REGVARADDR },
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{ "regvars", PRAGMA_REGVARS }, /* obsolete */
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{ "rodata-name", PRAGMA_RODATA_NAME },
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{ "rodataseg", PRAGMA_RODATASEG }, /* obsolete */
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{ "signed-chars", PRAGMA_SIGNED_CHARS },
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{ "signedchars", PRAGMA_SIGNEDCHARS }, /* obsolete */
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{ "static-locals", PRAGMA_STATIC_LOCALS },
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{ "staticlocals", PRAGMA_STATICLOCALS }, /* obsolete */
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{ "warn", PRAGMA_WARN },
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{ "zpsym", PRAGMA_ZPSYM },
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{ "bss-name", PRAGMA_BSS_NAME },
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{ "bssseg", PRAGMA_BSSSEG }, /* obsolete */
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{ "charmap", PRAGMA_CHARMAP },
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{ "check-stack", PRAGMA_CHECK_STACK },
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{ "checkstack", PRAGMA_CHECKSTACK }, /* obsolete */
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{ "code-name", PRAGMA_CODE_NAME },
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{ "codeseg", PRAGMA_CODESEG }, /* obsolete */
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{ "codesize", PRAGMA_CODESIZE },
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{ "data-name", PRAGMA_DATA_NAME },
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{ "dataseg", PRAGMA_DATASEG }, /* obsolete */
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{ "optimize", PRAGMA_OPTIMIZE },
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{ "register-vars", PRAGMA_REGISTER_VARS },
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{ "regvaraddr", PRAGMA_REGVARADDR },
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{ "regvars", PRAGMA_REGVARS }, /* obsolete */
|
||||
{ "rodata-name", PRAGMA_RODATA_NAME },
|
||||
{ "rodataseg", PRAGMA_RODATASEG }, /* obsolete */
|
||||
{ "signed-chars", PRAGMA_SIGNED_CHARS },
|
||||
{ "signedchars", PRAGMA_SIGNEDCHARS }, /* obsolete */
|
||||
{ "static-locals", PRAGMA_STATIC_LOCALS },
|
||||
{ "staticlocals", PRAGMA_STATICLOCALS }, /* obsolete */
|
||||
{ "warn", PRAGMA_WARN },
|
||||
{ "writable-strings", PRAGMA_WRITABLE_STRINGS },
|
||||
{ "zpsym", PRAGMA_ZPSYM },
|
||||
};
|
||||
|
||||
/* Result of ParsePushPop */
|
||||
|
@ -772,6 +774,10 @@ static void ParsePragma (void)
|
|||
WarnPragma (&B);
|
||||
break;
|
||||
|
||||
case PRAGMA_WRITABLE_STRINGS:
|
||||
FlagPragma (&B, &WritableStrings);
|
||||
break;
|
||||
|
||||
case PRAGMA_ZPSYM:
|
||||
StringPragma (&B, MakeZPSym);
|
||||
break;
|
||||
|
|
|
@ -406,9 +406,9 @@ static void CharConst (void)
|
|||
|
||||
static void StringConst (void)
|
||||
/* Parse a quoted string */
|
||||
{
|
||||
NextTok.IVal = GetLiteralPoolOffs ();
|
||||
NextTok.Tok = TOK_SCONST;
|
||||
{
|
||||
/* String buffer */
|
||||
StrBuf S = AUTO_STRBUF_INITIALIZER;
|
||||
|
||||
/* Concatenate strings. If at least one of the concenated strings is a wide
|
||||
* character literal, the whole string is a wide char literal, otherwise
|
||||
|
@ -436,7 +436,7 @@ static void StringConst (void)
|
|||
Error ("Unexpected newline");
|
||||
break;
|
||||
}
|
||||
AddLiteralChar (ParseChar ());
|
||||
SB_AppendChar (&S, ParseChar ());
|
||||
}
|
||||
|
||||
/* Skip closing quote char if there was one */
|
||||
|
@ -448,7 +448,14 @@ static void StringConst (void)
|
|||
}
|
||||
|
||||
/* Terminate the string */
|
||||
AddLiteralChar ('\0');
|
||||
SB_AppendChar (&S, '\0');
|
||||
|
||||
/* Add the whole string to the literal pool */
|
||||
NextTok.IVal = AddLiteralStr (&S);
|
||||
NextTok.Tok = TOK_SCONST;
|
||||
|
||||
/* Free the buffer */
|
||||
SB_Done (&S);
|
||||
}
|
||||
|
||||
|
||||
|
|
Loading…
Reference in New Issue
Block a user