1 %default { "func":"MterpDoPackedSwitch" } 2 /* 3 * Handle a packed-switch or sparse-switch instruction. In both cases 4 * we decode it and hand it off to a helper function. 5 * 6 * We don't really expect backward branches in a switch statement, but 7 * they're perfectly legal, so we check for them here. 8 * 9 * for: packed-switch, sparse-switch 10 */ 11 /* op vAA, +BBBBBBBB */ 12 .extern $func 13 .extern MterpProfileBranch 14 lh a0, 2(rPC) # a0 <- bbbb (lo) 15 lh a1, 4(rPC) # a1 <- BBBB (hi) 16 srl a3, rINST, 8 # a3 <- AA 17 ins a0, a1, 16, 16 # a0 <- BBBBbbbb 18 GET_VREG a1, a3 # a1 <- vAA 19 dlsa a0, a0, rPC, 1 # a0 <- PC + BBBBbbbb*2 20 jal $func # v0 <- code-unit branch offset 21 move rINST, v0 22 #if MTERP_PROFILE_BRANCHES 23 EXPORT_PC 24 move a0, rSELF 25 daddu a1, rFP, OFF_FP_SHADOWFRAME 26 move a2, rINST 27 jal MterpProfileBranch # (self, shadow_frame, offset) 28 bnezc v0, MterpOnStackReplacement # Note: offset must be in rINST 29 #endif 30 dlsa rPC, rINST, rPC, 1 # rPC <- rPC + offset * 2 31 lw ra, THREAD_FLAGS_OFFSET(rSELF) # Preload flags for MterpCheckSuspendAndContinue 32 move a0, rINST # a0 <- offset 33 FETCH_INST # load rINST 34 blez a0, MterpCheckSuspendAndContinue # suspend check if backwards branch 35 GET_INST_OPCODE v0 # extract opcode from rINST 36 GOTO_OPCODE v0 # jump to next instruction 37
