bc: remove "error after expression parsing" check
It is misplaced: caller knows better what can or cannot follow the expression.
Sometimes even caller's caller: "if (1) return a+b else..." -
parser of "return" does not know that "else" after it is valid,
parser of stmt does not know it either, - only parser of
"if" knows it!
The removed code balked on e.g. "{ print 1 }" statement.
This does not break any valid programs, but starts accepting some
invalid ones, e.g. "print 1 print 2" would work.
function old new delta
zcommon_parse_expr 40 32 -8
zbc_parse_name 509 494 -15
zbc_parse_stmt_possibly_auto 1678 1638 -40
bc_parse_expr_empty_ok 2025 1977 -48
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-111) Total: -111 bytes
text data bss dec hex filename
981599 485 7296 989380 f18c4 busybox_old
981488 485 7296 989269 f1855 busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
b44a7f1d66
commit
4b72aebe80
282
miscutils/bc.c
282
miscutils/bc.c
@ -390,7 +390,6 @@ typedef struct BcInstPtr {
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// BC_LEX_NEG is not used in lexing; it is only for parsing.
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typedef enum BcLexType {
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BC_LEX_EOF,
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BC_LEX_INVALID,
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@ -553,7 +552,93 @@ enum {
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| (1 << 19) // 19
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};
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#define bc_lex_kws_POSIX(i) ((1 << (i)) & POSIX_KWORD_MASK)
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// This is a bit array that corresponds to token types. An entry is
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// true if the token is valid in an expression, false otherwise.
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// Used to figure out when expr parsing should stop *without error message*
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// - 0 element indicates this condition. 1 means "this token is to be eaten
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// as part of the expression", token can them still be determined to be invalid
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// by later processing.
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enum {
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#define EXBITS(a,b,c,d,e,f,g,h) \
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((uint64_t)((a << 0)+(b << 1)+(c << 2)+(d << 3)+(e << 4)+(f << 5)+(g << 6)+(h << 7)))
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BC_PARSE_EXPRS_BITS = 0
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+ (EXBITS(0,0,1,1,1,1,1,1) << (0*8)) // 0: eof inval ++ -- - ^ * /
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+ (EXBITS(1,1,1,1,1,1,1,1) << (1*8)) // 8: % + - == <= >= != <
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+ (EXBITS(1,1,1,1,1,1,1,1) << (2*8)) // 16: > ! || && ^= *= /= %=
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+ (EXBITS(1,1,1,0,0,1,1,0) << (3*8)) // 24: += -= = NL WS ( ) [
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+ (EXBITS(0,0,0,0,0,0,1,1) << (4*8)) // 32: , ] { ; } STR NAME NUM
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+ (EXBITS(0,0,0,0,0,0,0,1) << (5*8)) // 40: auto break cont define else for halt ibase
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+ (EXBITS(0,1,1,1,1,0,0,1) << (6*8)) // 48: if last len limits obase print quit read - bug, why "limits" is allowed?
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+ (EXBITS(0,1,1,0,0,0,0,0) << (7*8)) // 56: return scale sqrt while
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#undef EXBITS
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};
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static ALWAYS_INLINE long bc_parse_exprs(unsigned i)
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{
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#if ULONG_MAX > 0xffffffff
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// 64-bit version (will not work correctly for 32-bit longs!)
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return BC_PARSE_EXPRS_BITS & (1UL << i);
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#else
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// 32-bit version
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unsigned long m = (uint32_t)BC_PARSE_EXPRS_BITS;
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if (i >= 32) {
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m = (uint32_t)(BC_PARSE_EXPRS_BITS >> 32);
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i &= 31;
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}
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return m & (1UL << i);
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#endif
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}
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// This is an array of data for operators that correspond to
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// [BC_LEX_OP_INC...BC_LEX_OP_ASSIGN] token types.
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static const uint8_t bc_parse_ops[] = {
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#define OP(p,l) ((int)(l) * 0x10 + (p))
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OP(0, false), OP( 0, false ), // inc dec
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OP(1, false), // neg
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OP(2, false), // pow
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OP(3, true ), OP( 3, true ), OP( 3, true ), // mul div mod
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OP(4, true ), OP( 4, true ), // + -
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OP(6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), // == <= >= != < >
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OP(1, false), // not
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OP(7, true ), OP( 7, true ), // or and
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OP(5, false), OP( 5, false ), OP( 5, false ), OP( 5, false ), OP( 5, false ), // ^= *= /= %= +=
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OP(5, false), OP( 5, false ), // -= =
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#undef OP
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};
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#define bc_parse_op_PREC(i) (bc_parse_ops[i] & 0x0f)
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#define bc_parse_op_LEFT(i) (bc_parse_ops[i] & 0x10)
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#endif // ENABLE_BC
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#if ENABLE_DC
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static const //BcInst - should be this type. Using signed narrow type since BC_INST_INVALID is -1
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int8_t
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dc_parse_insts[] = {
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_REL_GE,
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BC_INST_INVALID, BC_INST_POWER, BC_INST_MULTIPLY, BC_INST_DIVIDE,
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BC_INST_MODULUS, BC_INST_PLUS, BC_INST_MINUS,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_BOOL_NOT, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_REL_GT, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_REL_GE,
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BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_IBASE,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_LENGTH, BC_INST_INVALID,
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BC_INST_OBASE, BC_INST_PRINT, BC_INST_QUIT, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_SCALE, BC_INST_SQRT, BC_INST_INVALID,
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BC_INST_REL_EQ, BC_INST_MODEXP, BC_INST_DIVMOD, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_EXECUTE, BC_INST_PRINT_STACK, BC_INST_CLEAR_STACK,
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BC_INST_STACK_LEN, BC_INST_DUPLICATE, BC_INST_SWAP, BC_INST_POP,
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BC_INST_ASCIIFY, BC_INST_PRINT_STREAM, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_PRINT, BC_INST_NQUIT, BC_INST_SCALE_FUNC,
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};
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#endif // ENABLE_DC
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typedef struct BcLex {
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const char *buf;
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@ -735,106 +820,6 @@ struct globals {
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#define IS_BC (ENABLE_BC && (!ENABLE_DC || applet_name[0] == 'b'))
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#define IS_DC (ENABLE_DC && (!ENABLE_BC || applet_name[0] != 'b'))
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#if ENABLE_BC
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// This is a bit array that corresponds to token types. An entry is
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// true if the token is valid in an expression, false otherwise.
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enum {
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BC_PARSE_EXPRS_BITS = 0
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+ ((uint64_t)((0 << 0)+(0 << 1)+(1 << 2)+(1 << 3)+(1 << 4)+(1 << 5)+(1 << 6)+(1 << 7)) << (0*8))
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+ ((uint64_t)((1 << 0)+(1 << 1)+(1 << 2)+(1 << 3)+(1 << 4)+(1 << 5)+(1 << 6)+(1 << 7)) << (1*8))
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+ ((uint64_t)((1 << 0)+(1 << 1)+(1 << 2)+(1 << 3)+(1 << 4)+(1 << 5)+(1 << 6)+(1 << 7)) << (2*8))
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+ ((uint64_t)((1 << 0)+(1 << 1)+(1 << 2)+(0 << 3)+(0 << 4)+(1 << 5)+(1 << 6)+(0 << 7)) << (3*8))
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+ ((uint64_t)((0 << 0)+(0 << 1)+(0 << 2)+(0 << 3)+(0 << 4)+(0 << 5)+(1 << 6)+(1 << 7)) << (4*8))
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+ ((uint64_t)((0 << 0)+(0 << 1)+(0 << 2)+(0 << 3)+(0 << 4)+(0 << 5)+(0 << 6)+(1 << 7)) << (5*8))
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+ ((uint64_t)((0 << 0)+(1 << 1)+(1 << 2)+(1 << 3)+(1 << 4)+(0 << 5)+(0 << 6)+(1 << 7)) << (6*8))
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+ ((uint64_t)((0 << 0)+(1 << 1)+(1 << 2)+(0 << 3) ) << (7*8))
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};
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static ALWAYS_INLINE long bc_parse_exprs(unsigned i)
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{
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#if ULONG_MAX > 0xffffffff
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// 64-bit version (will not work correctly for 32-bit longs!)
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return BC_PARSE_EXPRS_BITS & (1UL << i);
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#else
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// 32-bit version
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unsigned long m = (uint32_t)BC_PARSE_EXPRS_BITS;
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if (i >= 32) {
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m = (uint32_t)(BC_PARSE_EXPRS_BITS >> 32);
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i &= 31;
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}
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return m & (1UL << i);
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#endif
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}
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// This is an array of data for operators that correspond to token types.
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static const uint8_t bc_parse_ops[] = {
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#define OP(p,l) ((int)(l) * 0x10 + (p))
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OP(0, false), OP( 0, false ), // inc dec
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OP(1, false), // neg
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OP(2, false),
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OP(3, true ), OP( 3, true ), OP( 3, true ), // pow mul div
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OP(4, true ), OP( 4, true ), // mod + -
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OP(6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), OP( 6, true ), // == <= >= != < >
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OP(1, false), // not
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OP(7, true ), OP( 7, true ), // or and
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OP(5, false), OP( 5, false ), OP( 5, false ), OP( 5, false ), OP( 5, false ), // ^= *= /= %= +=
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OP(5, false), OP( 5, false ), // -= =
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#undef OP
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};
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#define bc_parse_op_PREC(i) (bc_parse_ops[i] & 0x0f)
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#define bc_parse_op_LEFT(i) (bc_parse_ops[i] & 0x10)
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// Byte array of up to 4 BC_LEX's, packed into 32-bit word
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typedef uint32_t BcParseNext;
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// These identify what tokens can come after expressions in certain cases.
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enum {
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#define BC_PARSE_NEXT4(a,b,c,d) ( (a) | ((b)<<8) | ((c)<<16) | ((((d)|0x80)<<24)) )
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#define BC_PARSE_NEXT2(a,b) BC_PARSE_NEXT4(a,b,0xff,0xff)
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#define BC_PARSE_NEXT1(a) BC_PARSE_NEXT4(a,0xff,0xff,0xff)
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bc_parse_next_expr = BC_PARSE_NEXT4(BC_LEX_NLINE, BC_LEX_SCOLON, BC_LEX_RBRACE, BC_LEX_EOF),
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bc_parse_next_param = BC_PARSE_NEXT2(BC_LEX_RPAREN, BC_LEX_COMMA),
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bc_parse_next_print = BC_PARSE_NEXT4(BC_LEX_COMMA, BC_LEX_NLINE, BC_LEX_SCOLON, BC_LEX_EOF),
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bc_parse_next_rel = BC_PARSE_NEXT1(BC_LEX_RPAREN),
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bc_parse_next_elem = BC_PARSE_NEXT1(BC_LEX_RBRACKET),
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bc_parse_next_for = BC_PARSE_NEXT1(BC_LEX_SCOLON),
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bc_parse_next_read = BC_PARSE_NEXT2(BC_LEX_NLINE, BC_LEX_EOF),
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#undef BC_PARSE_NEXT4
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#undef BC_PARSE_NEXT2
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#undef BC_PARSE_NEXT1
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};
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#endif // ENABLE_BC
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#if ENABLE_DC
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static const //BcInst - should be this type. Using signed narrow type since BC_INST_INVALID is -1
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int8_t
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dc_parse_insts[] = {
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_REL_GE,
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BC_INST_INVALID, BC_INST_POWER, BC_INST_MULTIPLY, BC_INST_DIVIDE,
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BC_INST_MODULUS, BC_INST_PLUS, BC_INST_MINUS,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_BOOL_NOT, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_REL_GT, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_REL_GE,
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BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_IBASE,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_LENGTH, BC_INST_INVALID,
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BC_INST_OBASE, BC_INST_PRINT, BC_INST_QUIT, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_SCALE, BC_INST_SQRT, BC_INST_INVALID,
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BC_INST_REL_EQ, BC_INST_MODEXP, BC_INST_DIVMOD, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_EXECUTE, BC_INST_PRINT_STACK, BC_INST_CLEAR_STACK,
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BC_INST_STACK_LEN, BC_INST_DUPLICATE, BC_INST_SWAP, BC_INST_POP,
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BC_INST_ASCIIFY, BC_INST_PRINT_STREAM, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID, BC_INST_INVALID,
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BC_INST_PRINT, BC_INST_NQUIT, BC_INST_SCALE_FUNC,
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};
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#endif // ENABLE_DC
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// In configurations where errors abort instead of propagating error
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// return code up the call chain, functions returning BC_STATUS
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// actually don't return anything, they always succeed and return "void".
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@ -3535,9 +3520,15 @@ static void bc_parse_number(BcParse *p)
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IF_BC(static BC_STATUS zbc_parse_stmt_or_funcdef(BcParse *p);)
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IF_DC(static BC_STATUS zdc_parse_parse(BcParse *p);)
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// "Parse" half of "parse,execute,repeat" main loop
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static BC_STATUS zcommon_parse(BcParse *p)
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{
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if (IS_BC) {
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// FIXME: "eating" of stmt delemiters is coded inconsistently
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// (sometimes zbc_parse_stmt() eats the delimiter, sometimes don't),
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// which causes bugs such as "print 1 print 2" erroneously accepted,
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// or "print 1 else 2" detecting parse error only after executing
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// "print 1" part.
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IF_BC(RETURN_STATUS(zbc_parse_stmt_or_funcdef(p));)
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}
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IF_DC(RETURN_STATUS(zdc_parse_parse(p));)
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@ -3625,10 +3616,20 @@ static void bc_parse_create(BcParse *p, size_t func)
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// first in the expr enum. Note: This only works for binary operators.
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#define BC_TOKEN_2_INST(t) ((char) ((t) - BC_LEX_NEG + BC_INST_NEG))
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static BC_STATUS zbc_parse_stmt_possibly_auto(BcParse *p, bool auto_allowed);
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static BC_STATUS zbc_parse_expr(BcParse *p, uint8_t flags, BcParseNext next);
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static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags, BcParseNext next);
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static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags);
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static BC_STATUS zbc_parse_expr(BcParse *p, uint8_t flags)
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{
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BcStatus s;
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s = bc_parse_expr_empty_ok(p, flags);
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if (s == BC_STATUS_PARSE_EMPTY_EXP)
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RETURN_STATUS(bc_error("empty expression"));
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RETURN_STATUS(s);
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}
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#define zbc_parse_expr(...) (zbc_parse_expr(__VA_ARGS__) COMMA_SUCCESS)
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static BC_STATUS zbc_parse_stmt_possibly_auto(BcParse *p, bool auto_allowed);
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#define zbc_parse_stmt_possibly_auto(...) (zbc_parse_stmt_possibly_auto(__VA_ARGS__) COMMA_SUCCESS)
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static BC_STATUS zbc_parse_stmt(BcParse *p)
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@ -3699,26 +3700,30 @@ static BC_STATUS zbc_parse_rightParen(BcParse *p, size_t ops_bgn, size_t *nexs)
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static BC_STATUS zbc_parse_params(BcParse *p, uint8_t flags)
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{
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BcStatus s;
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bool comma = false;
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size_t nparams;
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dbg_lex("%s:%d p->l.t.t:%d", __func__, __LINE__, p->l.t.t);
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flags = (flags & ~(BC_PARSE_PRINT | BC_PARSE_REL)) | BC_PARSE_ARRAY;
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s = zbc_lex_next(&p->l);
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if (s) RETURN_STATUS(s);
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for (nparams = 0; p->l.t.t != BC_LEX_RPAREN; ++nparams) {
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flags = (flags & ~(BC_PARSE_PRINT | BC_PARSE_REL)) | BC_PARSE_ARRAY;
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s = zbc_parse_expr(p, flags, bc_parse_next_param);
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if (s) RETURN_STATUS(s);
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comma = p->l.t.t == BC_LEX_COMMA;
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if (comma) {
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nparams = 0;
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if (p->l.t.t != BC_LEX_RPAREN) {
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for (;;) {
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s = zbc_parse_expr(p, flags);
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if (s) RETURN_STATUS(s);
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nparams++;
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if (p->l.t.t != BC_LEX_COMMA) {
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if (p->l.t.t == BC_LEX_RPAREN)
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break;
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RETURN_STATUS(bc_error_bad_token());
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}
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s = zbc_lex_next(&p->l);
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if (s) RETURN_STATUS(s);
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}
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}
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if (comma) RETURN_STATUS(bc_error_bad_token());
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bc_parse_push(p, BC_INST_CALL);
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bc_parse_pushIndex(p, nparams);
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@ -3785,7 +3790,7 @@ static BC_STATUS zbc_parse_name(BcParse *p, BcInst *type, uint8_t flags)
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} else {
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*type = BC_INST_ARRAY_ELEM;
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flags &= ~(BC_PARSE_PRINT | BC_PARSE_REL);
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s = zbc_parse_expr(p, flags, bc_parse_next_elem);
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s = zbc_parse_expr(p, flags);
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if (s) goto err;
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}
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s = zbc_lex_next(&p->l);
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@ -3848,7 +3853,7 @@ static BC_STATUS zbc_parse_builtin(BcParse *p, BcLexType type, uint8_t flags,
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s = zbc_lex_next(&p->l);
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if (s) RETURN_STATUS(s);
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s = zbc_parse_expr(p, flags, bc_parse_next_rel);
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s = zbc_parse_expr(p, flags);
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if (s) RETURN_STATUS(s);
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if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
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@ -3879,7 +3884,7 @@ static BC_STATUS zbc_parse_scale(BcParse *p, BcInst *type, uint8_t flags)
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s = zbc_lex_next(&p->l);
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if (s) RETURN_STATUS(s);
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s = zbc_parse_expr(p, flags, bc_parse_next_rel);
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s = zbc_parse_expr(p, flags);
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||||
if (s) RETURN_STATUS(s);
|
||||
if (p->l.t.t != BC_LEX_RPAREN)
|
||||
RETURN_STATUS(bc_error_bad_token());
|
||||
@ -3999,7 +4004,7 @@ static BC_STATUS zbc_parse_print(BcParse *p)
|
||||
if (type == BC_LEX_STR) {
|
||||
s = zbc_parse_string(p, BC_INST_PRINT_POP);
|
||||
} else {
|
||||
s = zbc_parse_expr(p, 0, bc_parse_next_print);
|
||||
s = zbc_parse_expr(p, 0);
|
||||
bc_parse_push(p, BC_INST_PRINT_POP);
|
||||
}
|
||||
if (s) RETURN_STATUS(s);
|
||||
@ -4025,7 +4030,7 @@ static BC_STATUS zbc_parse_return(BcParse *p)
|
||||
bc_parse_push(p, BC_INST_RET0);
|
||||
else {
|
||||
bool paren = (t == BC_LEX_LPAREN);
|
||||
s = bc_parse_expr_empty_ok(p, 0, bc_parse_next_expr);
|
||||
s = bc_parse_expr_empty_ok(p, 0);
|
||||
if (s == BC_STATUS_PARSE_EMPTY_EXP) {
|
||||
bc_parse_push(p, BC_INST_RET0);
|
||||
s = zbc_lex_next(&p->l);
|
||||
@ -4063,7 +4068,7 @@ static BC_STATUS zbc_parse_if(BcParse *p)
|
||||
|
||||
s = zbc_lex_next(&p->l);
|
||||
if (s) RETURN_STATUS(s);
|
||||
s = zbc_parse_expr(p, BC_PARSE_REL, bc_parse_next_rel);
|
||||
s = zbc_parse_expr(p, BC_PARSE_REL);
|
||||
if (s) RETURN_STATUS(s);
|
||||
|
||||
if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
|
||||
@ -4123,7 +4128,7 @@ static BC_STATUS zbc_parse_while(BcParse *p)
|
||||
bc_vec_push(&p->exits, &ip_idx);
|
||||
bc_vec_push(&p->func->labels, &ip_idx);
|
||||
|
||||
s = zbc_parse_expr(p, BC_PARSE_REL, bc_parse_next_rel);
|
||||
s = zbc_parse_expr(p, BC_PARSE_REL);
|
||||
if (s) RETURN_STATUS(s);
|
||||
if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
|
||||
|
||||
@ -4158,7 +4163,7 @@ static BC_STATUS zbc_parse_for(BcParse *p)
|
||||
if (s) RETURN_STATUS(s);
|
||||
|
||||
if (p->l.t.t != BC_LEX_SCOLON)
|
||||
s = zbc_parse_expr(p, 0, bc_parse_next_for);
|
||||
s = zbc_parse_expr(p, 0);
|
||||
else
|
||||
s = bc_POSIX_does_not_allow_empty_X_expression_in_for("init");
|
||||
|
||||
@ -4175,7 +4180,7 @@ static BC_STATUS zbc_parse_for(BcParse *p)
|
||||
bc_vec_push(&p->func->labels, &p->func->code.len);
|
||||
|
||||
if (p->l.t.t != BC_LEX_SCOLON)
|
||||
s = zbc_parse_expr(p, BC_PARSE_REL, bc_parse_next_for);
|
||||
s = zbc_parse_expr(p, BC_PARSE_REL);
|
||||
else
|
||||
s = bc_POSIX_does_not_allow_empty_X_expression_in_for("condition");
|
||||
|
||||
@ -4192,7 +4197,7 @@ static BC_STATUS zbc_parse_for(BcParse *p)
|
||||
bc_vec_push(&p->func->labels, &p->func->code.len);
|
||||
|
||||
if (p->l.t.t != BC_LEX_RPAREN)
|
||||
s = zbc_parse_expr(p, 0, bc_parse_next_rel);
|
||||
s = zbc_parse_expr(p, 0);
|
||||
else
|
||||
s = bc_POSIX_does_not_allow_empty_X_expression_in_for("update");
|
||||
|
||||
@ -4444,7 +4449,7 @@ static BC_STATUS zbc_parse_stmt_possibly_auto(BcParse *p, bool auto_allowed)
|
||||
case BC_LEX_KEY_READ:
|
||||
case BC_LEX_KEY_SCALE:
|
||||
case BC_LEX_KEY_SQRT:
|
||||
s = zbc_parse_expr(p, BC_PARSE_PRINT, bc_parse_next_expr);
|
||||
s = zbc_parse_expr(p, BC_PARSE_PRINT);
|
||||
break;
|
||||
case BC_LEX_STR:
|
||||
s = zbc_parse_string(p, BC_INST_PRINT_STR);
|
||||
@ -4530,7 +4535,7 @@ static BC_STATUS zbc_parse_stmt_or_funcdef(BcParse *p)
|
||||
#define zbc_parse_stmt_or_funcdef(...) (zbc_parse_stmt_or_funcdef(__VA_ARGS__) COMMA_SUCCESS)
|
||||
|
||||
// This is not a "z" function: can also return BC_STATUS_PARSE_EMPTY_EXP
|
||||
static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags, BcParseNext next)
|
||||
static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags)
|
||||
{
|
||||
BcStatus s = BC_STATUS_SUCCESS;
|
||||
BcInst prev = BC_INST_PRINT;
|
||||
@ -4766,19 +4771,6 @@ static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags, BcParseNext ne
|
||||
if (prev == BC_INST_BOOL_NOT || nexprs != 1)
|
||||
return bc_error_bad_expression();
|
||||
|
||||
//TODO: why is this needed at all?
|
||||
// next is BcParseNext, byte array of up to 4 BC_LEX's, packed into 32-bit word
|
||||
for (;;) {
|
||||
if (t == (next & 0x7f))
|
||||
goto ok;
|
||||
if (next & 0x80) // last element?
|
||||
break;
|
||||
next >>= 8;
|
||||
}
|
||||
if (t != BC_LEX_KEY_ELSE)
|
||||
return bc_error_bad_expression();
|
||||
ok:
|
||||
|
||||
if (!(flags & BC_PARSE_REL) && nrelops) {
|
||||
s = bc_POSIX_does_not_allow("comparison operators outside if or loops");
|
||||
IF_ERROR_RETURN_POSSIBLE(if (s) return s);
|
||||
@ -4797,18 +4789,6 @@ static BcStatus bc_parse_expr_empty_ok(BcParse *p, uint8_t flags, BcParseNext ne
|
||||
return s;
|
||||
}
|
||||
|
||||
#undef zbc_parse_expr
|
||||
static BC_STATUS zbc_parse_expr(BcParse *p, uint8_t flags, BcParseNext next)
|
||||
{
|
||||
BcStatus s;
|
||||
|
||||
s = bc_parse_expr_empty_ok(p, flags, next);
|
||||
if (s == BC_STATUS_PARSE_EMPTY_EXP)
|
||||
RETURN_STATUS(bc_error("empty expression"));
|
||||
RETURN_STATUS(s);
|
||||
}
|
||||
#define zbc_parse_expr(...) (zbc_parse_expr(__VA_ARGS__) COMMA_SUCCESS)
|
||||
|
||||
#endif // ENABLE_BC
|
||||
|
||||
#if ENABLE_DC
|
||||
@ -5008,7 +4988,7 @@ static BC_STATUS zdc_parse_parse(BcParse *p)
|
||||
static BC_STATUS zcommon_parse_expr(BcParse *p, uint8_t flags)
|
||||
{
|
||||
if (IS_BC) {
|
||||
IF_BC(RETURN_STATUS(zbc_parse_expr(p, flags, bc_parse_next_read)));
|
||||
IF_BC(RETURN_STATUS(zbc_parse_expr(p, flags)));
|
||||
} else {
|
||||
IF_DC(RETURN_STATUS(zdc_parse_expr(p, flags)));
|
||||
}
|
||||
|
||||
@ -76,6 +76,11 @@ testing "bc print 1,2,3" \
|
||||
"123" \
|
||||
"" "print 1,2,3"
|
||||
|
||||
testing "bc { print 1 }" \
|
||||
"bc" \
|
||||
"1" \
|
||||
"" "{ print 1 }"
|
||||
|
||||
testing "bc nested loops and breaks" \
|
||||
"bc" \
|
||||
"\
|
||||
|
||||
Loading…
Reference in New Issue
Block a user