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Support variable array length instantiation on MSVC

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As MSVC doesn't implement C99, variable-length arrays
are not supported. We use _alloca instead.
This commit is contained in:
Nicolas Léveillé 2015-12-13 14:57:42 +01:00
parent c5ca35c347
commit c95b2987b1
1 changed files with 19 additions and 2 deletions
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21
src/parsers/choice.c
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@ -1,6 +1,20 @@
#include <stdarg.h>
#include "parser_internal.h"
#if defined(__STDC_VERSION__) && ( \
(__STDC_VERSION__ >= 201112L && !defined(__STDC_NO_VLA__)) || \
(__STDC_VERSION__ >= 199901L) \
)
# define STACK_VLA(type,name,size) type name[size]
#else
# if defined(_MSC_VER)
# include <malloc.h> // for _alloca
# define STACK_VLA(type,name,size) type* name = _alloca(size)
# else
# error "Missing VLA implementation for this compiler"
# endif
#endif
typedef struct {
size_t len;
HParser **p_array;
@ -53,11 +67,14 @@ static void desugar_choice(HAllocator *mm__, HCFStack *stk__, void *env) {
static bool choice_ctrvm(HRVMProg *prog, void* env) {
HSequence *s = (HSequence*)env;
uint16_t gotos[s->len];
// NOTE(uucidl): stack allocation since this backend uses
// setjmp/longjmp for error handling.
STACK_VLA(uint16_t, gotos, s->len);
for (size_t i=0; i<s->len; ++i) {
uint16_t insn = h_rvm_insert_insn(prog, RVM_FORK, 0);
if (!h_compile_regex(prog, s->p_array[i]))
if (!h_compile_regex(prog, s->p_array[i])) {
return false;
}
gotos[i] = h_rvm_insert_insn(prog, RVM_GOTO, 65535);
h_rvm_patch_arg(prog, insn, h_rvm_get_ip(prog));
}