92 lines
3.2 KiB
Text
92 lines
3.2 KiB
Text
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From lcc 4.0 to 4.1:
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Changes:
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See doc/4.html for changes in the code-generation interface.
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Warns about constants that are too large, eg, short x = 70000;
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Warns about expressions that have no effect.
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Unsigned shorts are now used for wide-character constants, and
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wchar_t is a typedef for unsigned short.
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More assertions in gen.c to confirm that the register allocator is
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configured correctly; ie, that the various masks, wildcards,
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clobbers, and targets are internally consistent. Full checking
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appears impractical, but there's still more than than there was
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before.
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On the SPARC, lcc now emits .type and .size directives
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unconditionally.
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On the x86, constants are now emitted into the text segment.
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If the environment variable "LCCDIR" is defined, it gives the directory
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that contains the preprocessor, the compiler proper, and the
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lcc-specific libraries.
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Under Windows, lcc searches the directories named in the environment
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variable "include" for header files.
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Errors fixed:
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Erroneously complained about unknown sizes for some const fields, eg,
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typedef struct foo ref; struct foo { const ref *q; int a; };
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f(ref *p, int i) { return p->q[i].a; }
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-A -A erroneously complained about static main's that didn't conform
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to the ANSI-mandated "int main(void)" or "int main(int, char **)".
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Silently generated incorrect code for a structure copy with a
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post-incremented target, eg,
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struct { int x; } data = {1}, copy[2], *q = copy;
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main() { *q++ = data; }
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Generated incorrect values in some expressions with constant pointers.
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Silently truncated string literals longer than 4095 characters.
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Failed to emit debugging information for uninitialized globals.
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Failed to diagnose missing sizes in some multi-dimensioned array
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declarators, eg, extern int x[][10]; int x[5][];
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Silently emitted incorrect sizes and initalizations for some
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incomplete multi-dimensioned arrays involving pointers and whose size
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is determined by the number of initializers.
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Set only the x.name field for some back-end symbols (eg, wildcards),
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and the uninitialized name field crashed some debugging output.
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uses() failed to check the register *set* as well as the register
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mask. There's no known bug demo, but a wildcard set might be
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contrived that would need the test.
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Crashed with -b on some conditional expressions involving calls, eg,
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int p; void g(void) { p ? f() : 1; }
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On the MIPS, sometimes generated an incorrect frame size and thus a
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crash when floating-point registers were saved.
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On the SPARC, erroneously reused a register variable as a temporary
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when the variable is compiler-generated.
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On the SPARC with -b, emitted incorrect code for returning structs.
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On the x86, conversion from float to int rounded instead of truncated
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with the default floating-point mode.
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On the x86, eliminate rtargets for kids after the first (see p. 419).
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On the x86, substitute reg for freg, in order to use the common reg
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rules. Needed only for debugging output, since we're not using any
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float regs as regs at this time.
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On the x86, "double f(); main(){f();}" wasn't popping the FP register stack.
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On the x86, ECX was saved by the callee, when it should have been
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saved by the caller.
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$Id: LOG 145 2001-10-17 21:53:10Z timo $
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