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Implement lxl for PowerPC ncg.

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This fixes lxl 1 (so it follows the static chain, not the dynamic
chain) and provides lxl 2 and greater.  The Modula-2 compiler uses lxl
for nested procedures, so they can access the variables of the
enclosing procedures.
This commit is contained in:
George Koehler 2017-02-13 23:22:31 -05:00
parent a8f62f44d8
commit cf728c2a2a
1 changed files with 32 additions and 17 deletions
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49
mach/powerpc/ncg/table
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@ -9,6 +9,7 @@ INT64 = 8
FP_OFFSET = 0 /* Offset of saved FP relative to our FP */
PC_OFFSET = 4 /* Offset of saved PC relative to our FP */
SL_OFFSET = 8 /* Offset of static link */
#define COMMENT(n) /* comment {LABEL, n} */
@ -1910,27 +1911,41 @@ PATTERNS
leaving
ret 0
pat lxl $1==0 /* Load FP */
/*
* Lexical local base: lxl 0 yields our fp, lxl n yields the
* fp of the nth statically enclosing procedure.
*/
pat lxl $1==0
leaving
lor 0
pat lxl $1==1
yields {IND_RC_W, fp, SL_OFFSET}
pat lxl $1==2
uses REG={IND_RC_W, fp, SL_OFFSET}
yields {IND_RC_W, %a, SL_OFFSET}
pat lxl $1==3
uses REG={IND_RC_W, fp, SL_OFFSET}, reusing %a, REG
gen move {IND_RC_W, %a, SL_OFFSET}, %b
yields {IND_RC_W, %b, SL_OFFSET}
pat lxl $1>=4 && $1<=0x8000
uses REG={IND_RC_W, fp, SL_OFFSET},
REG={CONST_0000_7FFF, $1-1}
gen
mtspr ctr, %b
1:
lwz %a, {IND_RC_W, %a, SL_OFFSET}
bdnz {LABEL, "1b"}
yields %a
pat lxl $1==1 /* Load caller's FP */
leaving
lxl 0
dch
pat dch /* FP -> caller FP */
pat dch /* Dynamic chain: LB -> caller's LB */
with REG
uses reusing %1, REG
gen
lwz %a, {IND_RC_W, %1, FP_OFFSET}
yields %a
yields {IND_RC_W, %1, FP_OFFSET}
pat lpb /* Convert FP to argument address */
pat lpb /* LB -> argument base */
leaving
adp EM_BSIZE
pat lxa /* Load caller's SP */
pat lxa /* Lexical argument base */
leaving
lxl $1
lpb
@ -1946,24 +1961,24 @@ PATTERNS
mtspr ctr, %a
bctr.
pat lor $1==0 /* Load FP */
pat lor $1==0 /* Load local base */
uses REG
gen
move fp, %a
yields %a
pat lor $1==1 /* Load SP */
pat lor $1==1 /* Load stack pointer */
uses REG
gen
move sp, %a
yields %a
pat str $1==0 /* Store FP */
pat str $1==0 /* Store local base */
with REG
gen
move %1, fp
pat str $1==1 /* Store SP */
pat str $1==1 /* Store stack pointer */
with REG
gen
move %1, sp