/*****************************************************************************/
/* */
-/* asmstmt.c */
+/* asmstmt.c */
/* */
-/* Inline assembler statements for the cc65 C compiler */
+/* Inline assembler statements for the cc65 C compiler */
/* */
/* */
/* */
-/* (C) 2001 Ullrich von Bassewitz */
-/* Wacholderweg 14 */
-/* D-70597 Stuttgart */
+/* (C) 2001-2008 Ullrich von Bassewitz */
+/* Roemerstrasse 52 */
+/* D-70794 Filderstadt */
/* EMail: uz@musoftware.de */
/* */
/* */
#include <string.h>
-/* cc65 */
+/* common */
+#include "xsprintf.h"
+
+/* cc65 */
+#include "asmlabel.h"
#include "codegen.h"
+#include "datatype.h"
#include "error.h"
+#include "expr.h"
+#include "function.h"
#include "litpool.h"
#include "scanner.h"
+#include "stackptr.h"
+#include "symtab.h"
#include "asmstmt.h"
/*****************************************************************************/
-/* Code */
+/* Code */
/*****************************************************************************/
+static void AsmRangeError (unsigned Arg)
+/* Print a diagnostic about a range error in the argument with the given number */
+{
+ Error ("Range error in argument %u", Arg);
+}
+
+
+
+static void AsmErrorSkip (void)
+/* Called in case of an error, skips tokens until the closing paren or a
+ * semicolon is reached.
+ */
+{
+ static const token_t TokenList[] = { TOK_RPAREN, TOK_SEMI };
+ SkipTokens (TokenList, sizeof(TokenList) / sizeof(TokenList[0]));
+}
+
+
+
+static SymEntry* AsmGetSym (unsigned Arg, unsigned Type)
+/* Find the symbol with the name currently in NextTok. The symbol must be of
+ * the given type. On errors, NULL is returned.
+ */
+{
+ SymEntry* Sym;
+
+ /* We expect an argument separated by a comma */
+ ConsumeComma ();
+
+ /* Argument must be an identifier */
+ if (CurTok.Tok != TOK_IDENT) {
+ Error ("Identifier expected for argument %u", Arg);
+ AsmErrorSkip ();
+ return 0;
+ }
+
+ /* Get a pointer to the symbol table entry */
+ Sym = FindSym (CurTok.Ident);
+
+ /* Did we find a symbol with this name? */
+ if (Sym == 0) {
+ Error ("Undefined symbol `%s' for argument %u", CurTok.Ident, Arg);
+ AsmErrorSkip ();
+ return 0;
+ }
+
+ /* We found the symbol - skip the name token */
+ NextToken ();
+
+ /* Check if we have a global symbol */
+ if ((Sym->Flags & Type) != Type) {
+ Error ("Type of argument %u differs from format specifier", Arg);
+ AsmErrorSkip ();
+ return 0;
+ }
+
+ /* Mark the symbol as referenced */
+ Sym->Flags |= SC_REF;
+
+ /* Return it */
+ return Sym;
+}
+
+
+
+static void ParseByteArg (StrBuf* T, unsigned Arg)
+/* Parse the %b format specifier */
+{
+ ExprDesc Expr;
+ char Buf [16];
+
+ /* We expect an argument separated by a comma */
+ ConsumeComma ();
+
+ /* Evaluate the expression */
+ ConstAbsIntExpr (hie1, &Expr);
+
+ /* Check the range but allow negative values if the type is signed */
+ if (IsSignUnsigned (Expr.Type)) {
+ if (Expr.IVal < 0 || Expr.IVal > 0xFF) {
+ AsmRangeError (Arg);
+ Expr.IVal = 0;
+ }
+ } else {
+ if (Expr.IVal < -128 || Expr.IVal > 127) {
+ AsmRangeError (Arg);
+ Expr.IVal = 0;
+ }
+ }
+
+ /* Convert into a hex number */
+ xsprintf (Buf, sizeof (Buf), "$%02lX", Expr.IVal & 0xFF);
+
+ /* Add the number to the target buffer */
+ SB_AppendStr (T, Buf);
+}
+
+
+
+static void ParseWordArg (StrBuf* T, unsigned Arg)
+/* Parse the %w format specifier */
+{
+ ExprDesc Expr;
+ char Buf [16];
+
+ /* We expect an argument separated by a comma */
+ ConsumeComma ();
+
+ /* Evaluate the expression */
+ ConstAbsIntExpr (hie1, &Expr);
+
+ /* Check the range but allow negative values if the type is signed */
+ if (IsSignUnsigned (Expr.Type)) {
+ if (Expr.IVal < 0 || Expr.IVal > 0xFFFF) {
+ AsmRangeError (Arg);
+ Expr.IVal = 0;
+ }
+ } else {
+ if (Expr.IVal < -32768 || Expr.IVal > 32767) {
+ AsmRangeError (Arg);
+ Expr.IVal = 0;
+ }
+ }
+
+ /* Convert into a hex number */
+ xsprintf (Buf, sizeof (Buf), "$%04lX", Expr.IVal & 0xFFFF);
+
+ /* Add the number to the target buffer */
+ SB_AppendStr (T, Buf);
+}
+
+
+
+static void ParseLongArg (StrBuf* T, unsigned Arg attribute ((unused)))
+/* Parse the %l format specifier */
+{
+ ExprDesc Expr;
+ char Buf [16];
+
+ /* We expect an argument separated by a comma */
+ ConsumeComma ();
+
+ /* Evaluate the expression */
+ ConstAbsIntExpr (hie1, &Expr);
+
+ /* Convert into a hex number */
+ xsprintf (Buf, sizeof (Buf), "$%08lX", Expr.IVal & 0xFFFFFFFF);
+
+ /* Add the number to the target buffer */
+ SB_AppendStr (T, Buf);
+}
+
+
+
+static void ParseGVarArg (StrBuf* T, unsigned Arg)
+/* Parse the %v format specifier */
+{
+ /* Parse the symbol name parameter and check the type */
+ SymEntry* Sym = AsmGetSym (Arg, SC_STATIC);
+ if (Sym == 0) {
+ /* Some sort of error */
+ return;
+ }
+
+ /* Check for external linkage */
+ if (Sym->Flags & (SC_EXTERN | SC_STORAGE | SC_FUNC)) {
+ /* External linkage or a function */
+ /* ### FIXME: Asm name should be generated by codegen */
+ SB_AppendChar (T, '_');
+ SB_AppendStr (T, Sym->Name);
+ } else if (Sym->Flags & SC_REGISTER) {
+ char Buf[32];
+ xsprintf (Buf, sizeof (Buf), "regbank+%d", Sym->V.R.RegOffs);
+ SB_AppendStr (T, Buf);
+ } else {
+ /* Static variable */
+ char Buf [16];
+ xsprintf (Buf, sizeof (Buf), "L%04X", Sym->V.Label);
+ SB_AppendStr (T, Buf);
+ }
+}
+
+
+
+static void ParseLVarArg (StrBuf* T, unsigned Arg)
+/* Parse the %o format specifier */
+{
+ unsigned Offs;
+ char Buf [16];
+
+ /* Parse the symbol name parameter and check the type */
+ SymEntry* Sym = AsmGetSym (Arg, SC_AUTO);
+ if (Sym == 0) {
+ /* Some sort of error */
+ return;
+ }
+
+ /* The symbol may be a parameter to a variadic function. In this case, we
+ * don't have a fixed stack offset, so check it and bail out with an error
+ * if this is the case.
+ */
+ if ((Sym->Flags & SC_PARAM) == SC_PARAM && F_IsVariadic (CurrentFunc)) {
+ Error ("Argument %u has no fixed stack offset", Arg);
+ AsmErrorSkip ();
+ return;
+ }
+
+ /* Calculate the current offset from SP */
+ Offs = Sym->V.Offs - StackPtr;
+
+ /* Output the offset */
+ xsprintf (Buf, sizeof (Buf), (Offs > 0xFF)? "$%04X" : "$%02X", Offs);
+ SB_AppendStr (T, Buf);
+}
+
+
+
+static void ParseLabelArg (StrBuf* T, unsigned Arg attribute ((unused)))
+/* Parse the %g format specifier */
+{
+ /* We expect an identifier separated by a comma */
+ ConsumeComma ();
+ if (CurTok.Tok != TOK_IDENT) {
+
+ Error ("Label name expected");
+
+ } else {
+
+ /* Add a new label symbol if we don't have one until now */
+ SymEntry* Entry = AddLabelSym (CurTok.Ident, SC_REF);
+
+ /* Append the label name to the buffer */
+ SB_AppendStr (T, LocalLabelName (Entry->V.Label));
+
+ /* Eat the label name */
+ NextToken ();
+
+ }
+}
+
+
+
+static void ParseStrArg (StrBuf* T, unsigned Arg attribute ((unused)))
+/* Parse the %s format specifier */
+{
+ ExprDesc Expr;
+ char Buf [64];
+
+ /* We expect an argument separated by a comma */
+ ConsumeComma ();
+
+ /* Check what comes */
+ switch (CurTok.Tok) {
+
+ case TOK_IDENT:
+ /* Identifier */
+ SB_AppendStr (T, CurTok.Ident);
+ NextToken ();
+ break;
+
+ case TOK_SCONST:
+ /* String constant */
+ SB_Append (T, GetLiteralStrBuf (CurTok.SVal));
+ NextToken ();
+ break;
+
+ default:
+ ConstAbsIntExpr (hie1, &Expr);
+ xsprintf (Buf, sizeof (Buf), "%ld", Expr.IVal);
+ SB_AppendStr (T, Buf);
+ break;
+ }
+}
+
+
+
+static void ParseAsm (void)
+/* Parse the contents of the ASM statement */
+{
+ unsigned Arg;
+ char C;
+
+ /* Create a target string buffer */
+ StrBuf T = AUTO_STRBUF_INITIALIZER;
+
+ /* Create a string buffer from the string literal */
+ StrBuf S = AUTO_STRBUF_INITIALIZER;
+ SB_Append (&S, GetLiteralStrBuf (CurTok.SVal));
+
+ /* Skip the string token */
+ NextToken ();
+
+ /* Parse the statement. It may contain several lines and one or more
+ * of the following place holders:
+ * %b - Numerical 8 bit value
+ * %w - Numerical 16 bit value
+ * %l - Numerical 32 bit value
+ * %v - Assembler name of a (global) variable
+ * %o - Stack offset of a (local) variable
+ * %g - Assembler name of a C label
+ * %s - Any argument converted to a string (almost)
+ * %% - The % sign
+ */
+ Arg = 0;
+ while ((C = SB_Get (&S)) != '\0') {
+
+ /* If it is a newline, the current line is ready to go */
+ if (C == '\n') {
+
+ /* Pass it to the backend and start over */
+ g_asmcode (&T);
+ SB_Clear (&T);
+
+ } else if (C == '%') {
+
+ /* Format specifier */
+ ++Arg;
+ C = SB_Get (&S);
+ switch (C) {
+ case '%': SB_AppendChar (&T, '%'); break;
+ case 'b': ParseByteArg (&T, Arg); break;
+ case 'g': ParseLabelArg (&T, Arg); break;
+ case 'l': ParseLongArg (&T, Arg); break;
+ case 'o': ParseLVarArg (&T, Arg); break;
+ case 's': ParseStrArg (&T, Arg); break;
+ case 'v': ParseGVarArg (&T, Arg); break;
+ case 'w': ParseWordArg (&T, Arg); break;
+ default:
+ Error ("Error in __asm__ format specifier %u", Arg);
+ AsmErrorSkip ();
+ goto Done;
+ }
+
+ } else {
+
+ /* A normal character, just copy it */
+ SB_AppendChar (&T, C);
+
+ }
+ }
+
+ /* If the target buffer is not empty, we have a last line in there */
+ if (!SB_IsEmpty (&T)) {
+ g_asmcode (&T);
+ }
+
+Done:
+ /* Call the string buf destructors */
+ SB_Done (&S);
+ SB_Done (&T);
+}
+
+
+
void AsmStatement (void)
/* This function parses ASM statements. The syntax of the ASM directive
* looks like the one defined for C++ (C has no ASM directive), that is,
NextToken ();
/* Need left parenthesis */
- ConsumeLParen ();
+ if (!ConsumeLParen ()) {
+ return;
+ }
/* String literal */
if (CurTok.Tok != TOK_SCONST) {
- Error ("String literal expected");
+
+ /* Print a diagnostic */
+ Error ("String literal expected");
+
+ /* Try some smart error recovery: Skip tokens until we reach the
+ * enclosing paren, or a semicolon.
+ */
+ AsmErrorSkip ();
+
} else {
- /* The string literal may consist of more than one line of assembler
- * code. Separate the single lines and output the code.
- */
- const char* S = GetLiteral (CurTok.IVal);
- while (*S) {
-
- /* Separate the lines */
- const char* E = strchr (S, '\n');
- if (E) {
- /* Found a newline */
- g_asmcode (S, E-S);
- S = E+1;
- } else {
- int Len = strlen (S);
- g_asmcode (S, Len);
- S += Len;
- }
- }
-
- /* Reset the string pointer, effectivly clearing the string from the
- * string table. Since we're working with one token lookahead, this
- * will fail if the next token is also a string token, but that's a
- * syntax error anyway, because we expect a right paren.
- */
- ResetLiteralPoolOffs (CurTok.IVal);
+ /* Parse the ASM statement */
+ ParseAsm ();
}
- /* Skip the string token */
- NextToken ();
-
/* Closing paren needed */
ConsumeRParen ();
}
-
-
-
projects / cc65 / blobdiff