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Add pseudo-instruction Ladjust_trap_depth #2322

Merged
merged 5 commits into from Jun 24, 2019
Merged

Add pseudo-instruction Ladjust_trap_depth #2322

merged 5 commits into from Jun 24, 2019

Commits on Jun 24, 2019

  1. Add pseudo-instruction Ladjust_trap_depth 

    Ladjust_trap_depth replaces dummy Lpushtrap generated in linearize of
Iexit to notify assembler generation about updates to the
stack. Ladjust_trap_depth is used to keep the virtual stack pointer in
sync and emit dwarf information, without emitting any assembly
instructions. It therefore avoids generating dead code.

This patch is extract from PR1482 @lthls
    @gretay-js
    gretay-js committed Jun 24, 2019
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  2. Improve discard_dead_code in linearize

    @gretay-js
    gretay-js committed Jun 24, 2019
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  3. More aggressive discard_dead_code in linearize for push/pop trap 

    Replace Lpushtrap and Lpoptrap with the curresponding Ladjust_trap_depth.
    @gretay-js
    gretay-js committed Jun 24, 2019
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  4. Add Changes entry and fix typos in comments

    @gretay-js
    gretay-js committed Jun 24, 2019
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  5. Simplify adjust_trap_depth "by the magic of recursion"

    @gretay-js
    gretay-js committed Jun 24, 2019
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