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Thanks to Nihal Jere for his initial patches implementing this
feature.
Fixes #35.
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Instead, use an additional int64_t member in the union. Since
exact-width integer types have no padding bits or trap representations,
and use two's-complement representation, we can portably access an
int64_t union member stored as uint64_t and vice-versa.
This allows us to reinterpret the value without invoking potentially
implementation-defined behavior of casting an unsigned integer to
a signed integer type which may not be able to represent its value.
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This will prepare us for adding a signed int64_t field called i.
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We don't need exact-width integer types here.
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As in ede6a5c9, if an expression is used only to control a jnz, we
don't need to convert it to a 0 or 1 value. QBE ignores the upper
32-bits of the argument to jnz, so the conversion is still needed
for pointer, long, and floating point types (including float since
-0 has non-zero bit representation).
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This reverts commit c16f07acf655b9f4fb006d8256b4027fb5a13aa8.
This incorrectly allows octal escapes to span between adjacent
string literals (e.g. "\0" "1" is not the same as "\01").
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If the argument was a function parameter, its type has already been
adjusted. So on x86_64, we can't just ignore the automatic
array-to-pointer conversion, since it was never a pointer to begin
with.
Instead, keep track of the adjusted va_list type, and check that
the arguments to varargs built-ins match that type.
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Previously, cproc effectively used used
typedef struct { /* 32 bytes, 8-byte aligned */ } __builtin_va_list[1];
However, this is not quite correct for x86_64 nor aarch64, though
it was close enough for both to work in most cases.
In actuality, for x86_64 we want
typedef struct { /* 24 bytes, 8-byte aligned */ } __builtin_va_list[1];
and for aarch64 we want
typedef struct { /* 32 bytes, 8-byte aligned */ } __builtin_va_list;
The difference only appears when the size of va_list matters, or
when va_list is passed as a parameter. However, the former is not
often the case, and the aarch64 ABI replaces aggregate arguments
with pointers to caller-allocated memory, which is quite similar
to arrays decaying to pointers in C except that the struct is not
copied.
Additionally, riscv64 simply uses
typedef void *__builtin_va_list;
which again has a different size and calling convention.
To fix this, make the __builtin_va_list type architecture-specific
and use architecture-specific tests for varargs-related functionality.
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Fixes #66.
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This way we avoid leaking backend-specific details of type
representation outside qbe.c. It also facilitates some future
simplifications.
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This function also ensures that the string prefixes (if any) are
compatible. It should make it easier to implement wide string
support.
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Labels are no longer used as instruction arguments.
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This reverts commit 6229709b8ae21d7722fef48ad8a9f2f10b900030.
I still don't understand how out-of-range enum constants are supposed
to work.
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gcc and clang allow enum constants out of range of int, but this
means that the type of enumerator may differ inside and outside the
enum specifier.
Instead, only allow out-of-range enum constants when their types
are compatible with the final enum type.
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This is for any non-whitespace character that doesn't match any
other token categories, and could be valid if stringified, or the
preprocessor is used by itself.
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The token pasting operator `##` still needs to be implemented.
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This function is like expect(), but operates on a specific token
and does not read the following token.
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This way, we can implement -include in the driver by just passing
an additional input to the compiler.
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This is needed for attributes, added in C2X (n2335).
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This will be needed for weak references and hidden visibility.
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When we are evaluating an arithmetic constant expression, we don't want
to indroduce static data definitions for string or compound literals.
Fixes #59.
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Fixes #47.
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