4 files changed, 23 insertions, 7 deletions
diff --git a/src/glsl/pp/sl_pp_context.c b/src/glsl/pp/sl_pp_context.c
index 8722376ae52..6d3076b8697 100644
--- a/src/glsl/pp/sl_pp_context.c
+++ b/src/glsl/pp/sl_pp_context.c
@@ -43,14 +43,28 @@ sl_pp_context_destroy(struct sl_pp_context *context)
 }
 
 int
-sl_pp_context_add_str(struct sl_pp_context *context,
-                      const char *str)
+sl_pp_context_add_unique_str(struct sl_pp_context *context,
+                             const char *str)
 {
    unsigned int size;
-   unsigned int offset;
+   unsigned int offset = 0;
 
    size = strlen(str) + 1;
 
+   /* Find out if this is a unique string. */
+   while (offset < context->cstr_pool_len) {
+      const char *str2;
+      unsigned int size2;
+
+      str2 = &context->cstr_pool[offset];
+      size2 = strlen(str2) + 1;
+      if (size == size2 && !memcmp(str, str2, size - 1)) {
+         return offset;
+      }
+
+      offset += size2;
+   }
+
    if (context->cstr_pool_len + size > context->cstr_pool_max) {
       context->cstr_pool_max = (context->cstr_pool_len + size + 0xffff) & ~0xffff;
       context->cstr_pool = realloc(context->cstr_pool, context->cstr_pool_max);
diff --git a/src/glsl/pp/sl_pp_context.h b/src/glsl/pp/sl_pp_context.h
index cb81f73ab9e..56f70777507 100644
--- a/src/glsl/pp/sl_pp_context.h
+++ b/src/glsl/pp/sl_pp_context.h
@@ -46,8 +46,8 @@ void
 sl_pp_context_destroy(struct sl_pp_context *context);
 
 int
-sl_pp_context_add_str(struct sl_pp_context *context,
-                      const char *str);
+sl_pp_context_add_unique_str(struct sl_pp_context *context,
+                             const char *str);
 
 const char *
 sl_pp_context_cstr(const struct sl_pp_context *context,
diff --git a/src/glsl/pp/sl_pp_token.c b/src/glsl/pp/sl_pp_token.c
index e200b961aaf..68c8fbe2ec4 100644
--- a/src/glsl/pp/sl_pp_token.c
+++ b/src/glsl/pp/sl_pp_token.c
@@ -53,7 +53,7 @@ _tokenise_identifier(struct sl_pp_context *context,
    }
    identifier[i++] = '\0';
 
-   info->data.identifier = sl_pp_context_add_str(context, identifier);
+   info->data.identifier = sl_pp_context_add_unique_str(context, identifier);
    if (info->data.identifier == -1) {
       return -1;
    }
@@ -91,7 +91,7 @@ _tokenise_number(struct sl_pp_context *context,
    }
    number[i++] = '\0';
 
-   info->data.number = sl_pp_context_add_str(context, number);
+   info->data.number = sl_pp_context_add_unique_str(context, number);
    if (info->data.number == -1) {
       return -1;
    }
diff --git a/src/glsl/pp/sl_pp_token.h b/src/glsl/pp/sl_pp_token.h
index c801804ae6e..a53720be802 100644
--- a/src/glsl/pp/sl_pp_token.h
+++ b/src/glsl/pp/sl_pp_token.h
@@ -28,6 +28,8 @@
 #ifndef SL_PP_TOKEN_H
 #define SL_PP_TOKEN_H
 
+#include "sl_pp_context.h"
+
 
 enum sl_pp_token {
    SL_PP_WHITESPACE,