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py/emitnative: Add support for return/break/continue in try and with.

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This patch adds full support for unwinding jumps to the native emitter.
This means that return/break/continue can be used in try-except,
try-finally and with statements.  For code that doesn't use unwinding jumps
there is almost no overhead added to the generated code.
This commit is contained in:
Damien George
2018-09-04 14:31:28 +10:00
parent 3cd2c281d7
commit 4ae7111573
7 changed files with 146 additions and 38 deletions
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6
py/emitnthumb.c
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@@ -8,8 +8,10 @@
#define GENERIC_ASM_API (1)
#include "py/asmthumb.h"
// Word index of REG_LOCAL_1(=r4) in nlr_buf_t
#define NLR_BUF_IDX_LOCAL_1 (3)
// Word indices of REG_LOCAL_x in nlr_buf_t
#define NLR_BUF_IDX_LOCAL_1 (3) // r4
#define NLR_BUF_IDX_LOCAL_2 (4) // r5
#define NLR_BUF_IDX_LOCAL_3 (5) // r6
#define N_THUMB (1)
#define EXPORT_FUN(name) emit_native_thumb_##name