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tcg: Add in_code_gen_buffer

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Create a function to determine if a pointer is within the buffer.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-10-30 18:59:09 -07:00
parent 8b5c2b6260
commit 4846cd37df
2 changed files with 19 additions and 18 deletions
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11
include/tcg/tcg.h
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@ -680,6 +680,17 @@ extern __thread TCGContext *tcg_ctx;
extern void *tcg_code_gen_epilogue;
extern TCGv_env cpu_env;
static inline bool in_code_gen_buffer(const void *p)
{
const TCGContext *s = &tcg_init_ctx;
/*
* Much like it is valid to have a pointer to the byte past the
* end of an array (so long as you don't dereference it), allow
* a pointer to the byte past the end of the code gen buffer.
*/
return (size_t)(p - s->code_gen_buffer) <= s->code_gen_buffer_size;
}
static inline size_t temp_idx(TCGTemp *ts)
{
ptrdiff_t n = ts - tcg_ctx->temps;