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tcg: Check for overflow via highwater mark

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We currently pre-compute an worst case code size for any TB, which
works out to be 122kB.  Since the average TB size is near 1kB, this
wastes quite a lot of storage.

Instead, check for overflow in between generating code for each opcode.
The overhead of the check isn't measurable and wastage is minimized.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-09-22 13:01:15 -07:00
parent f293709c6a
commit b125f9dc7b
4 changed files with 40 additions and 16 deletions
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5
tcg/tcg.h
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@ -559,10 +559,11 @@ struct TCGContext {
void *code_gen_prologue;
void *code_gen_buffer;
size_t code_gen_buffer_size;
/* threshold to flush the translated code buffer */
size_t code_gen_buffer_max_size;
void *code_gen_ptr;
/* Threshold to flush the translated code buffer. */
void *code_gen_highwater;
TBContext tb_ctx;
/* The TCGBackendData structure is private to tcg-target.c. */