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[release/6.0-rc2] [interp] Disable optimization if the var index is greater than G_MAXUINT16 #59261

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Sep 21, 2021
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[release/6.0-rc2] [interp] Disable optimization if the var index is greater than G_MAXUINT16 #59261

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11 changes: 6 additions & 5 deletions src/mono/mono/mini/interp/transform.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9288,8 +9288,8 @@ interp_alloc_offsets (TransformData *td)
if (ins->flags & INTERP_INST_FLAG_CALL) {
int *call_args = ins->info.call_args;
if (call_args) {
int pair_sregs [MINT_MOV_PAIRS_MAX];
int pair_dregs [MINT_MOV_PAIRS_MAX];
guint16 pair_sregs [MINT_MOV_PAIRS_MAX];
guint16 pair_dregs [MINT_MOV_PAIRS_MAX];
int num_pairs = 0;
int var = *call_args;

Expand All @@ -9303,9 +9303,10 @@ interp_alloc_offsets (TransformData *td)
td->locals [new_var].flags |= INTERP_LOCAL_FLAG_CALL_ARGS;

int mt = mint_type (td->locals [var].type);
if (mt != MINT_TYPE_VT && num_pairs < MINT_MOV_PAIRS_MAX) {
pair_sregs [num_pairs] = var;
pair_dregs [num_pairs] = new_var;
if (mt != MINT_TYPE_VT && num_pairs < MINT_MOV_PAIRS_MAX && var <= G_MAXUINT16 && new_var <= G_MAXUINT16) {
// We store these in the instruction data slots so we do this optimizations only if they fit
pair_sregs [num_pairs] = (guint16)var;
pair_dregs [num_pairs] = (guint16)new_var;
num_pairs++;
// The arg of the call is no longer global
*call_args = new_var;
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