gallium: use execmem for PPC code, grow instruction buffer as needed

3 files changed, 58 insertions, 21 deletions

diff --git a/src/gallium/auxiliary/rtasm/rtasm_ppc.c b/src/gallium/auxiliary/rtasm/rtasm_ppc.c
index a90b5587b0..e73ed71a0b 100644
--- a/src/gallium/auxiliary/rtasm/rtasm_ppc.c
+++ b/src/gallium/auxiliary/rtasm/rtasm_ppc.c
@@ -38,6 +38,7 @@
 #include <stdio.h>
 #include "util/u_memory.h"
 #include "pipe/p_debug.h"
+#include "rtasm_execmem.h"
 #include "rtasm_ppc.h"
 
 
@@ -46,9 +47,9 @@ ppc_init_func(struct ppc_function *p, unsigned max_inst)
 {
    uint i;
 
-   p->store = align_malloc(max_inst * PPC_INST_SIZE, 16);
    p->num_inst = 0;
-   p->max_inst = max_inst;
+   p->max_inst = 100; /* first guess at buffer size */
+   p->store = rtasm_exec_malloc(p->max_inst * PPC_INST_SIZE);
    p->reg_used = 0x0;
    p->fp_used = 0x0;
    p->vec_used = 0x0;
@@ -66,12 +67,19 @@ ppc_release_func(struct ppc_function *p)
 {
    assert(p->num_inst <= p->max_inst);
    if (p->store != NULL) {
-      align_free(p->store);
+      rtasm_exec_free(p->store);
    }
    p->store = NULL;
 }
 
 
+uint
+ppc_num_instructions(const struct ppc_function *p)
+{
+   return p->num_inst;
+}
+
+
 void (*ppc_get_func(struct ppc_function *p))(void)
 {
 #if 0
@@ -202,6 +210,35 @@ ppc_release_vec_register(struct ppc_function *p, int reg)
 }
 
 
+/**
+ * Append instruction to instruction buffer.  Grow buffer if out of room.
+ */
+static void
+emit_instruction(struct ppc_function *p, uint32_t inst_bits)
+{
+   if (!p->store)
+      return;  /* out of memory, drop the instruction */
+
+   if (p->num_inst == p->max_inst) {
+      /* allocate larger buffer */
+      uint32_t *newbuf;
+      p->max_inst *= 2;  /* 2x larger */
+      newbuf = rtasm_exec_malloc(p->max_inst * PPC_INST_SIZE);
+      if (newbuf) {
+         memcpy(newbuf, p->store, p->num_inst * PPC_INST_SIZE);
+      }
+      rtasm_exec_free(p->store);
+      p->store = newbuf;
+      if (!p->store) {
+         /* out of memory */
+         p->num_inst = 0;
+         return;
+      }
+   }
+
+   p->store[p->num_inst++] = inst_bits;
+}
+
 
 union vx_inst {
    uint32_t bits;
@@ -223,8 +260,7 @@ emit_vx(struct ppc_function *p, uint op2, uint vD, uint vA, uint vB)
    inst.inst.vA = vA;
    inst.inst.vB = vB;
    inst.inst.op2 = op2;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 };
 
 
@@ -250,8 +286,7 @@ emit_vxr(struct ppc_function *p, uint op2, uint vD, uint vA, uint vB)
    inst.inst.vB = vB;
    inst.inst.rC = 0;
    inst.inst.op2 = op2;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 };
 
 
@@ -277,8 +312,7 @@ emit_va(struct ppc_function *p, uint op2, uint vD, uint vA, uint vB, uint vC)
    inst.inst.vB = vB;
    inst.inst.vC = vC;
    inst.inst.op2 = op2;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 };
 
 
@@ -300,8 +334,7 @@ emit_i(struct ppc_function *p, uint op, uint li, uint aa, uint lk)
    inst.inst.li = li;
    inst.inst.aa = aa;
    inst.inst.lk = lk;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 }
 
 
@@ -330,8 +363,7 @@ emit_xl(struct ppc_function *p, uint op, uint bo, uint bi, uint bh,
    inst.inst.bh = bh;
    inst.inst.op2 = op2;
    inst.inst.lk = lk;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 }
 
 static INLINE void
@@ -373,8 +405,7 @@ emit_x(struct ppc_function *p, uint op, uint vrs, uint ra, uint rb, uint op2)
    inst.inst.rb = rb;
    inst.inst.op2 = op2;
    inst.inst.unused = 0x0;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 }
 
 
@@ -398,8 +429,7 @@ emit_d(struct ppc_function *p, uint op, uint rt, uint ra, int si)
    inst.inst.rt = rt;
    inst.inst.ra = ra;
    inst.inst.si = (unsigned) (si & 0xffff);
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 };
 
 
@@ -428,8 +458,7 @@ emit_a(struct ppc_function *p, uint op, uint frt, uint fra, uint frb, uint op2,
    inst.inst.unused = 0x0;
    inst.inst.op2 = op2;
    inst.inst.rc = rc;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 };
 
 
@@ -458,8 +487,7 @@ emit_xo(struct ppc_function *p, uint op, uint rt, uint ra, uint rb, uint oe,
    inst.inst.oe = oe;
    inst.inst.op2 = op2;
    inst.inst.rc = rc;
-   p->store[p->num_inst++] = inst.bits;
-   assert(p->num_inst <= p->max_inst);
+   emit_instruction(p, inst.bits);
 }
 
 
diff --git a/src/gallium/auxiliary/rtasm/rtasm_ppc.h b/src/gallium/auxiliary/rtasm/rtasm_ppc.h
index 561e139bce..d0477dec94 100644
--- a/src/gallium/auxiliary/rtasm/rtasm_ppc.h
+++ b/src/gallium/auxiliary/rtasm/rtasm_ppc.h
@@ -64,6 +64,7 @@ struct ppc_function
 
 extern void ppc_init_func(struct ppc_function *p, unsigned max_inst);
 extern void ppc_release_func(struct ppc_function *p);
+extern uint ppc_num_instructions(const struct ppc_function *p);
 extern void (*ppc_get_func( struct ppc_function *p ))( void );
 extern void ppc_dump_func(const struct ppc_function *p);
 
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ppc.c b/src/gallium/auxiliary/tgsi/tgsi_ppc.c
index 5d13070922..a92b1902e3 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ppc.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_ppc.c
@@ -1315,6 +1315,14 @@ tgsi_emit_ppc(const struct tgsi_token *tokens,
 
    tgsi_parse_free( &parse );
 
+   if (ppc_num_instructions(func) == 0) {
+      /* ran out of memory for instructions */
+      ok = FALSE;
+   }
+
+   if (!ok)
+      debug_printf("TGSI->PPC translation failed\n");
+
    return ok;
 }