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wasm2c: Add an optional endianness command line argument.

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If not given, endianness is inferred from the target that wasm2c is built for.
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Alex Rønne Petersen 2024-10-15 22:52:46 +02:00
parent 5cb45b6855
commit c2e6be97ff
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1 changed files with 17 additions and 3 deletions
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20
stage1/wasm2c.c
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@ -76,13 +76,27 @@ static void renderExpr(FILE *out, struct InputStream *in) {
static const uint32_t big_endian = 0xff000000; static const uint32_t big_endian = 0xff000000;
int main(int argc, char **argv) { int main(int argc, char **argv) {
if (argc != 3) { if (argc != 3 && argc != 4) {
fprintf(stderr, "usage: %s in.wasm.zst out.c\n", argv[0]); fprintf(stderr, "usage: %s <in.wasm.zst> <out.c> [endian]\n", argv[0]);
return 1; return 1;
} }
bool is_big_endian;
if (argc >= 4) {
if (!strcmp(argv[3], "big")) {
is_big_endian = true;
} else if (!strcmp(argv[3], "little")) {
is_big_endian = false;
} else {
fprintf(stderr, "endianness must be 'big' or 'little'\n");
return 1;
}
} else {
is_big_endian = *(uint8_t *)&big_endian; // Infer from host endianness.
}
const char *mod = "wasm"; const char *mod = "wasm";
bool is_big_endian = *(uint8_t *)&big_endian;
struct InputStream in; struct InputStream in;
InputStream_open(&in, argv[1]); InputStream_open(&in, argv[1]);